WO2014173208A1

WO2014173208A1 - Adiabatic autoignition testing device

Info

Publication number: WO2014173208A1
Application number: PCT/CN2014/073158
Authority: WO
Inventors: 朱先德; 李冬军; 方伟; 王芹; 毛仲; 蔡敏
Original assignee: 湖南三德科技股份有限公司
Priority date: 2013-04-23
Filing date: 2014-03-11
Publication date: 2014-10-30
Also published as: CN103235004A; CN103235004B; AU2014256717A1; AU2014101562A4

Abstract

An adiabatic autoignition testing device, comprising a water-bath assembly (4), a heating assembly (7), a pre-heating assembly (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 assembly (4); the heating assembly (7) communicates with the water-bath assembly (4), and heats the water environment in the water-bath assembly (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 assembly (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.

Description

Adiabatic spontaneous combustion test equipment

[Technical Field]

The invention mainly relates to the field of coal sample testing equipment, and particularly relates to a coal sample spontaneous combustion test device adopting an adiabatic design.

【Background technique】

When the rate at which coal generates heat exceeds the rate of heat dissipation, spontaneous combustion may occur during coal mines or storage. In order to avoid spontaneous combustion of coal, the heat generation of coal should be minimized in the coal pile and the heat dissipation should be increased as much as possible. This principle should be applied to the transportation of all coal mines, treatment, piles and coal. Therefore, it is necessary to test the coal sample for self-ignition. Currently, only the equipment for measuring the spontaneous combustion performance of coal by chromatographic oxygen absorption method is available.

[Summary of the Invention]

The technical problem to be solved by the present invention is that, in view of the technical problems existing in the prior art, the present invention provides an adiabatic spontaneous combustion test device which is simple and compact in structure, low in cost, simple in operation, high in automation, and high in test accuracy.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

An adiabatic spontaneous combustion test apparatus comprising a water bath assembly, a heating assembly, a preheating assembly, a reactor, a pneumatic system, and a control system, the reactor being configured to hold a coal sample to be tested and placed in a water bath assembly, the heating The assembly is in communication with the water bath assembly and heats the water environment in the water bath assembly, the reactor being in communication with the external air supply member via a pneumatic system, the preheating assembly being disposed on the pneumatic system.

As a further improvement of the invention:

The reactor includes a cup body and a sealing cover, the sealing cover is disposed at an open end of the cup body, and the sealing cover is provided with an air inlet joint and an exhaust joint.

The cup body is further provided with a screw cap, and the screw cap is threadedly engaged with the cup body, and the screw cap is pressed at the edge of the sealing cap.

The intake joint is provided with an intake air temperature measuring component, the exhaust joint is provided with an exhaust temperature measuring component, and in the cup body, a temperature measuring component in the coal, the temperature measuring component in the coal, The intake air temperature measuring component and the exhaust air temperature measuring component are connected to the control system.

The heating assembly includes a heating chamber and a heating rod and a hot water pump installed in the heating chamber, wherein the heating chamber is provided with a water connection, and the heating chamber is connected to the water bath assembly through the water connection and the connecting tube; The water bath assembly comprises a water bath chamber, a stirring pump, and a stirring tube wrapped around the outside of the reactor. The water bath chamber communicates with the heating chamber through a water connection and a connecting tube. The water bath chamber is filled with an aqueous medium, and the reactor is placed in a water bath chamber. The mixing pump is connected to the mixing tube Pass.

A mixer is disposed at an inlet end of the agitating pump, and an overflow pipe is disposed on the water bath chamber and communicates with the heating chamber through the overflow pipe.

A water bath cavity temperature measuring component is disposed in the water bath cavity, and a heating cavity temperature measuring component is disposed in the heating cavity, and the water bath cavity temperature measuring component and the heating cavity temperature measuring component are all connected to the control system.

The airway system includes an intake pipe and an intake pipe, and the intake pipe is connected to an external air supply member via an air inlet, and an air outlet of the intake pipe is connected to the intake pipe, and the intake pipe is inserted The preheating assembly includes a preheating water pipe, and the preheating water pipe is configured to introduce heat source water from the preheating water inlet, and the preheating water pipe has an injection hole facing the intake pipe.

The reactor further includes a guiding and positioning fixing mechanism, the guiding and positioning fixing mechanism comprises a guiding mechanism, a bottom frame and a bracket, wherein the reactor is placed in the bracket through a guiding mechanism, and the bracket is stuck in the chassis .

Compared with the prior art, the invention has the advantages that: the adiabatic spontaneous combustion test device of the invention has the advantages of simple and compact structure, low cost and simple operation, and can automatically complete the detection process of spontaneous combustion of the coal sample, and the whole process is very reliable, and the test precision is high.

[Description of the Drawings]

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic perspective view of the present invention.

Figure 2 is a perspective view showing another perspective of the present invention.

Figure 3 is a schematic view showing the structure of the reactor of the present invention.

Figure 4 is a schematic view showing the structure of the heating unit and the water bath assembly of the present invention.

Figure 5 is a schematic view showing the working principle of the pneumatic system and the preheating assembly of the present invention.

Fig. 6 is a schematic view showing the structure of the guiding and positioning fixing mechanism in the present invention.

illustration:

1, pneumatic system; 101, intake pipe; 102, intake duct; 103, air inlet; 104, air outlet; 2, outer frame; 3, control system; 4, water bath assembly; 401, water bath cavity; Mixing pump; 403, mixing tube; 404, mixer; 405, overflow pipe; 406, water bath cavity temperature measuring device; 5, preheating component; 501, preheated water pipe; 502, preheating water inlet; 503, heat source water container 6, reactor; 601, electrical joints; 602, exhaust temperature measuring parts; 603, intake air temperature measuring parts; 604, threaded cover; 605, coal temperature measuring parts; 606, sealing cover; 607, cup body; 608, substance to be tested; 609, exhaust joint; 610, air inlet joint; 611, guiding mechanism; 612, chassis; 613, bracket; 7, heating assembly; 701, heating chamber; 702, heating rod; Hot water pump; 704, water connection; 705, heating chamber temperature measurement. 【detailed description】

The invention will be further described in detail below in conjunction with the drawings and specific embodiments. As shown in FIGS. 1 and 2, the adiabatic spontaneous combustion test apparatus of the present invention comprises a water bath assembly 4, a heating unit 7, a preheating unit 5, a reactor 6, a gas path system 1, a control system 3, and an outer frame 2, The vessel 6 is used to hold the coal sample to be tested, the reactor 6 is placed in the water bath assembly 4, and the heating assembly 7 is used to heat the water environment in the water bath assembly 4 to bring the temperature of the water in the water bath assembly 4 into the reactor 6. The temperature difference of the coal sample temperature is kept within a very small range. Reactor 6 is in communication with an external air supply component through a pneumatic system 1, which is an oxygen supply component and a nitrogen supply component, or in other embodiments, nitrogen gas is replaced with other inert gas. The gas path system 1 is provided with a preheating assembly 5, by which the oxygen or nitrogen entering the reactor 6 can be preheated to the same temperature as the coal sample before entering the reactor 6, and the above components are ensured. The coal sample was placed in an adiabatic environment during the test. The invention is mainly used for strictly simulating the physical process of spontaneous combustion for a certain amount of coal, and measuring the tendency of spontaneous combustion of coal. Put the coal into the holding flask, and put a certain speed of nitrogen preheating into the flask containing the coal sample. When the coal sample reaches a certain temperature, the nitrogen gas is switched to a certain speed of oxygen, and the coal sample has different properties. The sample will heat up, and the time and rate required to increase the coal sample from 40 degrees to 70 degrees will be tested to test the spontaneous combustion tendency of the coal sample.

As shown in FIG. 3, in the embodiment, the reactor 6 includes a cup body 607 and a sealing cover 606. The cup body 607 can be a vacuum insulated flask or a dewar bottle or a heat insulating cup. The sealing cover 606 is made of a material having a low thermal conductivity. It is disposed at the open end of the cup body 607 to realize the substance 608 (coal sample) to be in an insulated environment. The seal cover 606 is provided with an intake joint 610 and an exhaust joint 609, and the intake joint 610 is supplied to the intake duct 102 of the air passage system 1.

Further, in the embodiment, a screw cap 604 is further disposed on the cup body 607. The screw cap 604 and the cup body 607 are threadedly engaged, and can be screwed by a thread; the screw cap 604 is pressed at the edge of the sealing cover 606. After the screw cap 604 is pressed, the sealing cover 606 will have no rotational movement, thereby preventing the agitation of the test substance 608 such as the intake duct 102 on the sealing cover 606 from being rotated.

Further, in this embodiment, an intake air temperature measuring member 603 is integrated on the air inlet joint 610, an exhaust gas temperature measuring member 602 is integrated on the exhaust joint 609, and a coal temperature measuring member 605 is further disposed in the cup body 607. The coal temperature measuring component 605, the intake air temperature measuring component 603, and the exhaust gas temperature measuring component 602 are connected to the control system 3 through the electrical connector 601 and the signal line, so that the temperature of the gas entering and exiting the reactor 6 and the cup body 607 can be accurately measured. The real-time temperature of the coal sample. Of course, in other embodiments, the exhaust temperature measurement point may not be placed on the sealing cover 606. Because the reactor coal sample and the sealing cover 606 have a certain interval layer, the exhaust temperature measuring point may be placed in the spacing layer. .

As shown in FIG. 6, the reactor 6 in this embodiment further includes a guiding and positioning fixing mechanism. The guiding and positioning fixing mechanism includes a guiding mechanism 611, a chassis 612 and a bracket 613. The reactor 6 is placed on the bracket 613 through the guiding mechanism 611. Inside, the bracket 613 is snapped into the chassis 612. In use, the rotating reactor 6 to the bracket is inserted into the card slot of the chassis 612, and the card slot of the chassis 612 is provided with a positioning mechanism and an anti-sway mechanism. As shown in FIG. 4, in this embodiment, the heating assembly 7 includes a heating chamber 701, a heating rod 702 installed in the heating chamber 701, and a heat pump 703. The heat pump 703 can also be installed in the heating chamber 701. In addition, the heating chamber 701 is provided with a water connection 704, and the heating chamber 701 is in communication with the water bath assembly 4 through the water connection 704 and the connection tube. The water bath assembly 4 includes a water bath chamber 401, a stirring pump 402, and a stirring tube 403 wrapped around the outside of the reactor 6. The water bath chamber 401 is in communication with the heating chamber 701 through a water connection 704 and a connecting tube. The water bath chamber 401 is filled with an aqueous medium, and the reactor 6 is Placed in the water bath cavity 401. The agitating pump 402 is in communication with the agitating tube 403, and the hot water is introduced into the agitating tube 403 by the agitating pump 402, and then the agitating tube 403 discharges the water into the water bath chamber 401, thereby raising the water temperature in an extreme time, and the reactor 6 is at any time. The temperature difference does not exceed ΔΤ, the water temperature rises without overshoot; or the overshoot is very limited, and the overshoot time is very short.

A mixer 404 is disposed at the inlet end of the agitating pump 402. The water bath chamber 401 is provided with a water overflow pipe 405 for communicating with the heating chamber 701 to realize water circulation, and the water amount of the water bath assembly 4 and the heating unit 7 is kept constant.

Further, in this embodiment, a water bath cavity temperature measuring member 406 is disposed in the water bath chamber 401, and a heating chamber temperature measuring member 705 is disposed in the heating chamber 701, and the water bath chamber temperature measuring member 406 and the heating chamber temperature measuring member 705 pass through the signal line. It is connected to the control system 3 to collect, control the heating and the temperature of the reactor 6 in real time.

As shown in FIG. 5, in the present embodiment, the pneumatic system 1 includes an intake pipe 101 and an intake duct 102. The intake pipe 101 communicates with an external air supply member via an intake port 103, and the intake pipe 101 is arranged in a spiral shape. On the outside of the device 6, the air outlet 104 of the intake pipe 101 communicates with the intake duct 102, and the intake duct 102 is inserted into the cup 607 of the reactor 6. The intake pipe 101 can be made of a copper tube having excellent thermal conductivity to enhance the heat transfer of the ambient temperature to the gas in the intake pipe 101. The preheating unit 5 includes a preheating water pipe 501. The preheating water pipe 501 is introduced with heat source water from the preheating water inlet 502. The heat source water may be sourced from a heat source water container 503, and the preheating water pipe 501 is distributed according to a certain regularity. The small hole forms an injection hole toward the intake pipe 101, and the hot water in the preheating pipe 501 is sprayed from the fine holes to the intake pipe 101, and also heats the water around the intake pipe 101.

Working principle: The coal sample is placed in the reactor 6, and the reactor 6 is placed in the water bath assembly 4. The thermal conductivity of the reactor 6 is extremely low, and the temperature difference between the temperature of the water in the water bath assembly 4 and the coal sample temperature in the reactor 6 is maintained within a very small range by the heating assembly 7, and the oxygen entering the reactor 6 enters the reactor. Before the preheating unit 5 is preheated to the same temperature as the coal sample, the coal sample is placed in an adiabatic environment during the test.

Before the temperature of the coal sample rises from room temperature to 40 degrees, the temperature rise of the coal sample is caused by the external heat by the gas path system 1. The preheating component 5 does not generate oxidation heat. The entire experimental process is fully automated by the control system 3.

The above is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, and all the technical solutions falling under the inventive concept belong to the protection scope of the present invention. It should be noted that a number of modifications and adaptations of the present invention are considered to be within the scope of the present invention without departing from the principles of the invention.

Claims

Rights request

1. An adiabatic spontaneous combustion test device, comprising: a water bath assembly (4), a heating assembly (7), a preheating assembly (5), a reactor (6), a pneumatic system (1), and a control system ( 3), the reactor (6) is used to hold a coal sample to be tested and placed in a water bath assembly (4), the heating assembly (7) is in communication with the water bath assembly (4) and the water bath assembly (4) The water environment is heated, and the reactor (6) is in communication with an external air supply unit via a pneumatic system (1), and the preheating unit (5) is disposed on the pneumatic system (1).

2. The adiabatic spontaneous combustion test apparatus according to claim 1, wherein the reactor (6) comprises a cup body (607) and a sealing cover (606), and the sealing cover (606) is covered in the cup An open end of the body (607), the sealing cover (606) is provided with an air inlet joint (610) and an exhaust joint (609).

3. The adiabatic spontaneous combustion test apparatus according to claim 2, wherein the cup body (607) further comprises a screw cap (604), and the screw cap (604) and the cup body (607) Threaded fit, the threaded cover

(604) Press at the edge of the seal cap (606).

The adiabatic self-ignition test apparatus according to claim 2, wherein the intake joint (610) is provided with an intake air temperature measuring member (603), and the exhaust joint (609) is provided Exhaust temperature measuring member (602), in the cup body

(607) is also provided with a temperature measuring component (605) in the coal, the temperature measuring component (605) in the coal, the air temperature measuring component (603), the exhaust temperature measuring component (602) and the control system (3) Connected.

The adiabatic spontaneous combustion test apparatus according to claim 1 or 2 or 3, wherein the heating assembly (7) comprises a heating chamber (701), a hot water pump (703), and a heating chamber (701) a heating rod (702), the heating chamber (701) is provided with a water connection (704), and the heating chamber (701) is connected to the water bath assembly (4) through a water connection (704) and a connecting pipe The water bath assembly (4) comprises a water bath chamber (401), a stirring pump (402), a stirring tube (403) wrapped around the outside of the reactor (6), and the water bath chamber (401) passes through the water connection (704) And the connecting tube is in communication with the heating chamber (701), the water bath chamber (401) is filled with the aqueous medium, the reactor (6) is placed in the water bath chamber (401); the stirring pump (402) and the stirring tube (403) ) Connected.

6. The adiabatic spontaneous combustion test apparatus according to claim 5, wherein a mixer (404) is disposed at an inlet end of the agitation pump (402), and an overflow pipe (405) is disposed on the water bath cavity (401). And through the overflow pipe (405) and the heating chamber (701).

7. The adiabatic spontaneous combustion test apparatus according to claim 5, wherein a water bath cavity temperature measuring member (406) is disposed in the water bath chamber (401), and a heating chamber is set in the heating chamber (701). The temperature component (705), the water bath cavity temperature measuring component (406) and the heating cavity temperature measuring component (705) are all connected to the control system (3). The adiabatic spontaneous combustion test apparatus according to claim 1 or 2 or 3, wherein the pneumatic system (1) comprises an intake pipe (101) and an intake duct (102), the intake pipe ( 101) communicating with an external air supply member via an air inlet (103), an air outlet (104) of the air inlet pipe (101) is in communication with an air intake conduit (102), and the air intake conduit (102) is inserted In the reactor (6); the preheating component (5) comprises a preheating water pipe (501), and the preheating water pipe (501) is introduced into the heat source water from the preheating water inlet (502), the preheating water pipe (501) There is a spray hole facing the intake pipe (101).

The adiabatic spontaneous combustion test apparatus according to claim 2 or 3 or 4, wherein the reactor (6) further comprises a guide positioning fixing mechanism, and the guide positioning fixing mechanism comprises a guiding mechanism (611) , the chassis (612) and the bracket (613), the reactor (6) is placed in the bracket (613) by a guiding mechanism (611), and the bracket (613) is snapped into the chassis (612) .