AU2014101562A4

AU2014101562A4 - Adiabatic autoignition testing device

Info

Publication number: AU2014101562A4
Application number: AU2014101562A
Authority: AU
Inventors: Min Cai; Wei Fang; Dongjun Li; Zhong MAO; Qin Wang; Xiande Zhu
Original assignee: Hunan Sundy Science and Technology Co Ltd
Current assignee: Hunan Sundy Science and Technology Co Ltd
Priority date: 2013-04-23
Filing date: 2014-03-11
Publication date: 2015-12-10
Anticipated expiration: 2022-03-11
Also published as: CN103235004A; WO2014173208A1; CN103235004B; AU2014256717A1

Abstract

PCT/CN2014/073158 An adiabatic spontaneous combustion apparatus, comprising a water-bath (4), a heater (7), a pre-heating system (5), a reactor (6), an air path system (1), and a control system (3); the reactor (6) is used to hold a coal sample to be tested, and is placed in the water-bath (4); the 5 heater (7) communicates with the water-bath (4), and heats the water environment in the water-bath (4); and the reactor (6) communicates with an external air supply component via the air path system (1), the air path system (1) being provided with the pre-heating system (5) thereon. With a simple and compact structure, the device has low cost, high degree of automation and high test precision, and is easy to operate. Figure Figure 1

Description

PCT/CN2014/073158 TITLE ADIABATIC SPONTANEOUS COMBUSTION APPARATUS FIELD OF THE INVENTION The present invention is related to the field of coal sample checkout equipment, particular to 5 an adiabatic spontaneous combustion apparatus. DESCRIPTION OF THE PRIOR ART Coals may combust spontaneously in mines or in storage when and if the rate of heat generation exceeds the rate of heat dissipation. In order to avoid spontaneous combustion of coals, the principle of minimizing the heat generation and maximizing the heat dissipation 0 capacities of the coal bulk should be applied in all stages of mining, handling, stockpiling and transporting of coal. Thus, we should test the propensity of the spontaneous combustion of the coal samples. In the market, there only exists equipments adopted physical oxygen absorption to test the propensity of the spontaneous combustion of the coal samples. SUMMARY OF THE INVENTION 5 Accordingly, the present invention is to solve the technical problem existed in the conventional technology. The present invention provides an adiabatic spontaneous combustion apparatus which has a simple and compact structure, low cost, high degree of automation and high test precision, and is easy to operate. According to the present invention, the foregoing and other objects and advantages are 0 attained by the following. An adiabatic spontaneous combustion apparatus comprises a water-bath, a heater, a pre-heating system, a reactor, an air path system, and a control system; the reactor is used to hold a coal sample to be tested, and is placed in the water-bath; the heater communicates with the water-bath, and heats up the water environment in the water-bath; and the reactor 25 communicates with an external air supply component via the air path system, the air path system being provided with the pre-heating system thereon. The present invention is further improved with the following features: Said reactor comprises a cup and a sealed cap, wherein said sealed cap is covered on the open end of the cup, wherein said sealed cap is provided with an air inlet joint and a guiding 30 mechanism thereon. Said cup is additionally provided with a screw cap thereon, the fit between said screw cap and cup is screw-thread fit, wherein said screw cap is compressed on the edge of the sealed cap. 1 PCT/CN2014/073158 Said air inlet joint is provided with an air inlet thermometer, wherein said guiding mechanism is provided with an exhaust thermometer; in said cup, there is provided with a coal thermometer ; said coal thermometer, air inlet thermometer, and said exhausting thermometer are connected with the control system. 5 Said heater comprises a heating cavity, a hot water pump and a heating rod, wherein the heating rod is arranged in the heating cavity, wherein said heating cavity is provided with a rinsing joint thereon, wherein said heating cavity is connected with a water-bath through the rinsing joint and the connecting pipe; said water-bath comprises a water-bath cavity, stirring pump, stirring tube covered on the outside of the reactor; said water-bath cavity is connected 0 with the heating cavity through the rinsing joint and the connecting pipe; said water-bath cavity is full of water, wherein said reactor is arranged in the water-bath cavity ; said stirring pump is communicated with the stirring tube . The inlet end of said stirring pump is provided with a stirrer; said water-bath cavity is provided with an overflow tube thereon and communicated with the heating cavity through the 5 overflow tube. A water-bath cavity thermometer is arranged in the water-bath cavity; a heating cavity thermometer is arranged in the heating cavity; both the water-bath cavity thermometer and the heating cavity thermometer are connected with the control system. Said air path system is provided with an inlet pipe and an air inlet duct , wherein said inlet 0 pipe is communicated with the external air supply component, wherein the air outlet of the inlet pipe is communicated with the air inlet duct, wherein said air inlet duct is plugged in the reactor; said pre-heating system comprises a pre-heating pipe , wherein said pre-heating pipe imports the hot water through the pre-heating inlet , said pre-heating pipe is provided with spray orifices towards to the inlet pipe thereon. 25 Said reactor also comprises a guiding positioning fixed mechanism, wherein said guiding positioning fixed mechanism comprises a guiding mechanism, an under frame, a bracket, wherein said reactor is arranged in the bracket through the guiding mechanism, wherein said bracket is stuck into the under frame. Compared to conventional technologies, the advantageous effect of the present invention is 30 as follows: The adiabatic spontaneous combustion apparatus of the present invention has the 2 PCT/CN2014/073158 advantages of simple and compact structure, low cost, and easy operation; it can automatically test the propensity of the spontaneous combustion of the coal samples; the whole process is highly reliable, and the test precision is high. BRIEF DESCRIPTION OF THE DRAWINGS 5 Fig. 1 is an elevational view of the present invention. Fig. 2 is another elevational view of the present invention. Fig. 3 is a structural schematic diagram of the reactor of the present invention Fig. 4 is a structural schematic diagram of the heater and the water-bath of the present invention. 0 Fig. 5 is a functional diagram of the air path system and pre-heating component of the present invention. Fig. 6 is a structural schematic diagram of the guiding positioning fixed mechanism of the present invention. Numbers of elements in the drawings are as follows: 5 1-air path system; 101- inlet pipe; 102- air inlet duct; 103-air inlet; 104-air outlet; 2-outer frame; 3-control system; 4-water-bath ; 401-water-bath cavity; 402-stirring pump; 403-stirring tube; 404-stirrer; 405-overflow tube; 406-water-bath cavity thermometer; 5-pre-heating system; 501-pre-heating pipe; 502-pre-heating inlet; 503-heat-source water receiver; 6-reactor; 601-electrical joint; 602-exhausting thermometer; 603-air inlet thermometer; 604-screw cap; 0 605-coal thermometer; 606-sealed cap; 607-cup; 608-inspecting sample; 609-exhausting joint; 610-air inlet joint; 611-guiding mechanism; 612-underframe; 613-bracket; 7-heater ; 701-heating cavity; 702-heating rod; 703-hot water pump; 704-rinsing joint; 705-heating cavity thermometer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention will further be described with reference to the accompany drawings 25 and illustrative examples as follows. As shown in fig. 1 and fig.2, the adiabatic spontaneous combustion apparatus of the present invention comprises a water-bath 4, a heater 7, a pre-heating system 5, a reactor 6, an air path system 1, a control system 3 and an outer frame 2; the reactor 6 is used for holding coal samples to be tested, and is arranged in the water-bath 4; the heater 7 is used for heating the water 30 environment of the water-bath 4, so that the temperature difference between the water of the water-bath 4 and the coal samples of the reactor 6 are maintained in a small range; the reactor 6 is communicated with an external air supply component via the air path system 1; the external air supply component is an oxygen supply component and a nitrogen supply component; or in other preferred embodiment, nitrogen could be instead by other inert gases. The air path system 1 is 35 provided with the pre-heating system 5 thereon; the pre-heating system 5 could preheat the 3 PCT /CN2014/073158 oxygen or the nitrogen, which is charged into the reactor 6, until the temperature of the gas is the same with the temperature of the coal samples, before the gas being charged into the reactor 6, through above mentioned assemblies, ensuring that the coal samples are in an adiabatic environment during testing. The present invention is mainly used for simulating the spontaneous 5 combustion physical processes of a certain amount of the coals rigorously, and is a device of measuring the propensity of the spontaneous combustion of the coal samples;. the coal are placed into the insulation flask, sustainable nitrogen are introduced into the flask having coals to preheat, when the temperature of coal samples have stabilized at a certain temperature, instead of the nitrogen by sustainable oxygen; according to the different characters of the coal samples, the 0 coal samples would be warming up naturally; the propensity of the spontaneous combustion of the coal samples is tested by recording the required time and speed of coal samples when the temperature is rising at 40 degrees to 70 degrees,. As shown in fig.3, in the present preferred embodiment, the reactor 6 comprises a cup 607 and a sealed cap 606; cup 607 can be adopted by an insulation vacuum flask or a dewar or a 5 vacuum cup; sealed cap 606 is adopted materials with low thermal conductivity, and is covered on the open end of the cup 607, so that the inspecting samples 608 (coal samples) is in a thermal environment. The sealed cap 606 is provided with an air inlet joint 610 and a guiding mechanism 609 thereon; the air inlet joint 610 is used for the entrance of the air inlet duct 102 of the air path system 1. 0 Further, in the present preferred embodiment, the cup 607 is additionally provided with a screw cap 604 thereon; the fit between the screw cap 604 and cup 607 is screw-thread fit, and those two components can be screwed by using screw-thread fit; said screw cap 604 is compressed on the edge of the sealed cap 606; when the screw cap 604 is compressed tightly, the sealed cap 606 can not orbit, and then can prevent the air inlet duct 102 arranged on the sealed 25 cap 606 from stirring the inspecting samples 608 due to the rotation of the sealed cap 606. Further, in the present preferred embodiment, the air inlet joint 610 is integrated with an air inlet thermometer 603 thereon; the guiding mechanism 609 is integrated with an exhausting thermometer 602 thereon; in the cup 607, there is provided with a coal thermometer 605; the coal thermometer 605, the air inlet thermometer 603, and the exhausting thermometer 602 are 30 connected with the control system 3 via an electrical joint 601 and signal lines; thus, we could precisely measure the temperature when gas into or out of the reactor 6, and the real-time temperature of the coal samples placed in the cup 607. Of course, in the other preferred embodiment, exhausting thermometric point could not be arranged on the sealed cap 606; because there is a certain wall between the coal samples of the reactor 6 and the sealed cap 606, 4 PCT /CN2014/073158 exhausting thermometric point could be arranged in this wall. As shown in fig.6, in the present preferred embodiment, the reactor 6 also comprises a guiding positioning fixed mechanism; the guiding positioning fixed mechanism comprises a guiding mechanism 611, an under frame 612, and a bracket 613; the reactor 6 is arranged in the 5 bracket 613 through the guiding mechanism 611; the bracket 613 is stuck into the under frame 612; when using, the reactor 6 is screwed until the bracket 613 got stuck into the slot of the under frame 612; the slot of the under frame 612 is provided with a locating device and an anti-rotary device. As shown in fig.4, in the present preferred embodiment, the heater 7 comprises a heating cavity 701, a hot water pump 703 and a heating rod 702, wherein the heating 0 rod 702 is arranged in the heating cavity 701; the hot water pump 703 could also be arranged on the outside of the heating cavity 701; the heating cavity 701 is provided with a rinsing joint 704 thereon; the heating cavity 701 is communicated with a water-bath 4 through the rinsing joint 704 and the connecting pipe. The water-bath 4 comprises a water-bath cavity 401, an stirring pump 402, an stirring tube 403, wherein the stirring tube 403 is covered on the outside of the 5 reactor 6; the water-bath cavity 401 is communicated with the heating cavity 701 through the rinsing joint 704 and the connecting pipe; the water-bath cavity 401 is full of water; the reactor 6 is arranged in the water-bath cavity 401. The stirring pump 402 is communicated with the stirring tube 403, using the stirring pump 402 could let the hot water into the stirring tube 403; then the water is discharged into the water-bath cavity 401 by the stirring tube 403, realizing the 0 rising of the water temperature in an extremely brief period; temperature difference of each point of the reactor 6 have not over AT at any time; when the water temperature is rising, there is no overshoot phenomenon; or there is a limited amount of overshoot, or short time of overshoot. The inlet end of said stirring pump 402 is provided with a stirrer 404; the water-bath cavity 401 is provided with an overflow tube 405 thereon, used for communicating with the heating 25 cavity 701, realizing the water cycle, keeping the constant amounts of water in the water-bath 4 and the heater 7. Further, in the present preferred embodiment, a water-bath cavity thermometer 406 is arranged in the water-bath cavity 401; a heating cavity thermometer 705 is arranged in the heating cavity 701; both the water-bath cavity thermometer 406 and the heating cavity 30 thermometer 705 are connected with the control system 3 via signal lines, realizing the real-time collection, controlling the heater and the temperature of the reactor 6. As shown in fig.5, in the present preferred embodiment, air path system 1 comprises an inlet pipe 101 and an air inlet duct 102; the inlet pipe 101 is communicated with an external air supply component via an air inlet 103; the inlet pipe 101 is spirals fitted with the outside of the 35 reactor 6; the air outlet 104 of the inlet pipe 101 is communicated with the air inlet duct 102; the 5 PCT/CN2014/073158 air inlet duct 102 is plugged in the cup 607 of the reactor 6; the inlet pipe 101 could be adopted red copper pipe with excellent thermal conductivity, enhancing the environment temperature influences on the heat conduction of gas in the inlet pipe 101. The pre-heating system 5 comprises a pre-heating pipe 501; the hot water is imported by the pre-heating pipe 501 through 5 the pre-heating inlet 502; the hot water could come from a heat-source water receiver 503; the pre-heating pipe 501 is provided with small holes distributed according to certain rules thereon; these holes are formed into a spray orifice towards to the inlet pipe 101; the hot water in the pre-heating pipe 501 is sprayed to the inlet pipe 101 from those small holes; in the meanwhile, the water around the inlet pipe 101 is warming. 0 Working principle: the coal samples are placed in the reactor 6; the reactor 6 is placed into the water-bath 4. The thermal conductivity of the reactor 6 is very low; the temperature difference between the water temperature of the water-bath 4 and the coal samples temperature are maintained in an extremely small range by using the heater 7; the oxygen charged into the reactor 6 is pre-heated to the same temperature of the coal samples by the pre-heating system 5 5 before it is charged into the reactor 6; those measures could ensure the coal samples stay in an adiabatic environment when testing. Before the temperature of coal samples is rising at the room temperature to 40 degrees, the air path system 1 and the pre-heating system 5 could make that the temperature rising of the coal samples are all induced by the heat from the exterior; thermal oxidation produced themselves 0 does not occur. The control system 3 could make the entire testing process being full-automation. The above is only the preferred embodiment of the present invention and the scope of the present invention are not limited by the above embodiments; therefore, all of the technical solutions within the spirit of the present invention should be included within the scope of the present invention. It should be pointed out that this invention includes all modifications 25 encompassed within the spirit and the scope of the present invention; for one skilled in the art. 6

Claims

1. An adiabatic spontaneous combustion apparatus comprises a water-bath (4), a heater (7), a pre-heating system (5), a reactor (6), an air path system (1), and a control system (3); the reactor (6) is used to hold a coal sample to be tested, and is placed in the water-bath (4); the 5 heater (7) communicates with the water-bath (4), and heats up the water environment in the water-bath (4); and the reactor (6) communicates with an external air supply component via the air path system (1), the air path system (1) being provided with the pre-heating system (5) thereon.

2. An adiabatic spontaneous combustion apparatus according to claim 1, said reactor (6) 0 comprises a cup (607) and a sealed cap (606) , wherein said sealed cap (606) is covered on the open end of the cup (607), wherein said sealed cap (606) is provided with an air inlet joint (610) and a guiding mechanism (609) thereon.

3. An adiabatic spontaneous combustion apparatus according to claim 2, wherein said cup (607) is additionally provided with a screw cap (604) thereon, the fit between said screw cap 5 (604) and cup (607) is screw-thread fit, wherein said screw cap (604) is compressed on the edge of the sealed cap (606).

4. An adiabatic spontaneous combustion apparatus according to claim 2, said air inlet joint (610) is provided with an air inlet thermometer (603), wherein said guiding mechanism (609) is provided with an exhaust thermometer (602); in said cup (607), there is provided with a coal 0 thermometer (605); said coal thermometer (605), air inlet thermometer (603), and said exhausting thermometer (602) are connected with the control system (3).

5. An adiabatic spontaneous combustion apparatus according to claim 1 or claim 2 or claim 3, said heater (7) comprises a heating cavity (701), a hot water pump (703) and a heating rod (702), wherein the heating rod (702) is arranged in the heating cavity (701), wherein said heating 25 cavity (701) is provided with a rinsing joint (704) thereon, wherein said heating cavity (701) is connected with a water-bath (4) through the rinsing joint (704) and the connecting pipe; said water-bath (4) comprises a water-bath cavity (401), stirring pump (402), stirring tube (403) covered on the outside of the reactor (6); said water-bath cavity (401) is connected with the heating cavity (701) through the rinsing joint (704) and the connecting pipe; said water-bath 30 cavity (401) is full of water, wherein said reactor (6) is arranged in the water-bath cavity (401); said stirring pump (402) is communicated with the stirring tube (403). 7 PCT/CN2014/073158

6. An adiabatic spontaneous combustion apparatus according to claim 5, the inlet end of said stirring pump (402) is provided with a stirrer (404); said water-bath cavity (401) is provided with an overflow tube (405) thereon and communicated with the heating cavity (701) through the overflow tube (405). 5

7. An adiabatic spontaneous combustion apparatus according to claim 5, a water-bath cavity thermometer (406) is arranged in the water-bath cavity (401); a heating cavity thermometer (705) is arranged in the heating cavity (701); both the water-bath cavity thermometer (406) and the heating cavity thermometer (705) are connected with the control system (3).

8. An adiabatic spontaneous combustion apparatus according to claim 1 or claim 2 or claim 0 3, said air path system (1) is provided with an inlet pipe (101) and an air inlet duct (102), wherein said inlet pipe (101) is communicated with the external air supply component, wherein the air outlet (104) of the inlet pipe (101) is communicated with the air inlet duct (102), wherein said air inlet duct (102) is plugged in the reactor (6); said pre-heating system (5) comprises a pre-heating pipe (501), wherein said pre-heating pipe (501) imports the hot water through the 5 pre-heating inlet (502), said pre-heating pipe (501) is provided with spray orifices towards to the inlet pipe (101) thereon.

9. An adiabatic spontaneous combustion apparatus according to claim 2 or claim 3 or claim 4, said reactor (6) also comprises a guiding positioning fixed mechanism, wherein said guiding positioning fixed mechanism comprises a guiding mechanism (611), an under frame (612), a 0 bracket (613), wherein said reactor (6) is arranged in the bracket (613) through the guiding mechanism (611), wherein said bracket (613) is stuck into the under frame (612). 8