JPH0734372Y2 - Combustion suppression equipment for plastic carbonization - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an instrument used for carbonizing plastics,
In particular, it relates to a combustion suppressing device for carbonizing plastics for suppressing the combustion of plastics during carbonization.

[Prior Art] Plastics are used for various purposes such as daily necessities, medical instruments, machine parts, building materials, etc., and the characteristics and productivity of these plastic products are improved every day.

In order to improve the characteristics and productivity of plastic products, first of all, the amount of metal catalyst remaining in these plastic products and their materials, the amount of inorganic fillers, and glass that is a reinforcing material in glass fiber reinforced resin The ash content (inorganic substances and non-combustible residues) such as the amount of fibers is quantified. As one of the methods for quantifying this ash, a method of quantifying the above ash in the ash after widely burning plastic products and their materials (hereinafter simply referred to as plastic) to ash is widely used. ing.

Generally, plastic ashing is performed by weighing an appropriate amount of a plastic sample in a refractory container such as a platinum dish, platinum crucible, and porcelain crucible, which has an open end, and heating it with a heating device such as a gas burner to temporarily remove the plastic. After the sample is carbonized, it is reheated by an electric furnace or the like. If you try to incinerate by burning the plastic sample without carbonizing the plastic sample, the combustion of the plastic sample will rapidly progress due to the heat from the heating equipment and the reaction heat accompanying the combustion, and a fire accompanying the rapid combustion The safety of ashing work will be reduced due to such problems as bumping and bumping, and accurate quantification of ash will not be possible due to spilling of the sample.

Therefore, when carbonizing a plastic sample, the heating temperature is generally adjusted while visually observing the plastic sample during carbonization so that the plastic sample does not burn. When the plastic sample burns, the operation of temporarily stopping the heating, cooling the plastic sample, and then reheating it is performed.

[Problems to be solved by the invention] However, in carbonization of plastic, it is very difficult to prevent combustion of the plastic sample by adjusting the heating temperature while visually observing the plastic sample during carbonization. Therefore, even if the heating temperature is lowered in advance and carbonized, the plastic sample is apt to burn suddenly. Then, once the plastic sample starts to burn, as described above, the heat from the heating equipment and the reaction heat associated with the combustion cause the plastic sample to rapidly burn, and the ash is generated due to fire or bumping accompanying the rapid burning. There is a problem in that the safety of the liquefaction work is reduced and the ash content cannot be accurately determined due to spillage of the plastic sample.

Further, when the plastic sample burns, as described above, it is necessary to stop the heating once, cool the plastic sample, and then reheat it. Therefore, in the carbonization of the plastic by the conventional method, the heating temperature is low, and Since heating, cooling, and reheating of the plastic sample must be repeated, it generally takes about 4 hours to carbonize, for example, 40 g of the plastic sample, and the carbonization time is long.

Therefore, the object of the present invention is to suppress the rapid combustion of the plastic sample even when heated at a relatively high temperature, which improves the safety of the carbonization work, suppresses the spillage of the plastic sample, and shortens the carbonization time. Another object of the present invention is to provide a combustion suppressing device for plastic carbonization, which can achieve the above.

[Means for Solving the Problems] The present invention has been made in order to achieve the above-mentioned object, and the combustion suppressing device for plastic carbonization of the present invention communicates directly or indirectly with an inert gas supply source. An annular tube surrounding the internal space of the refractory container or the interior of the refractory container at or near the open surface side end of the refractory container with one open end containing the sample, and the inert gas supplied to the annular pipe. A ring-shaped tube portion having at least an inert gas ejection port ejecting from the ring-shaped tube toward an upper part of the inner space of the refractory container or an upper part of the inner space.

[Operation] When the combustion suppressing device for carbonizing plastics of the present invention is used, the inert gas is distributed so as to surround these spaces above or above the internal space of the refractory container containing the plastic sample. This means that the circulation of the atmosphere is stagnant between the inner space of the refractory container and its outer space, or between the space consisting of this inner space and the space above it and its outer space.

Therefore, since the supply of oxygen to the plastic sample during carbonization is delayed by using the combustion suppressing device for plastic carbonization of the present invention, even if the plastic sample is heated at a relatively high temperature, the ignition of the gas generated from the plastic sample is suppressed. To be done. That is, rapid combustion of the plastic sample during carbonization is suppressed. Even when the plastic sample burns, the supply of oxygen to the plastic sample is delayed, so that the momentum of the fire is weak and the fire is easily extinguished.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

EXAMPLE FIG. 1 shows an example of a combustion suppressing device for carbonizing a plastic according to the present invention.

This plastic carbonization combustion suppression device 1 has an annular pipe 2 having a circular vertical cross section as a pipe and an annular shape as an annular body, and a plurality of inert gas ejection ports 3 provided in the annular pipe 2. It has an annular pipe part 4 with.

An inert gas supplied from a nitrogen gas (N ₂ gas) supply source (not shown) communicating with the annular pipe 2 through a conduit (not shown) is further provided in the annular pipe portion 4. Inert gas introduction part 5 to be supplied into the pipe 2 and three support parts 6a radially provided from the lower pipe wall of the annular pipe 2 to support the annular pipe 2 at a predetermined height. , 6b and 6c
And three refractory vessel supports 7a, 7b and 7c having an L-shaped vertical cross-section provided on the wall of the annular tube 2 between these supports 6a, 6b and 6c (where 7b and 7c are (Not shown).

And in FIG. 1, the refractory container support parts 7a and 7b which comprise the combustion suppression device 1 for plastic carbonization mentioned above, and
A platinum crucible 9 containing a plastic sample 8 is supported by 7c. The platinum crucible 9 has an outer diameter of 75 mm at the end on the opening surface side, an inner diameter of 74 mm at the end on the opening surface side, and a depth of 30 mm, and is supported by the refractory container supporting portions 7a, 7b and 7c. The opening surface side end of the crucible 9 is located slightly below the opening positions of the plurality of inert gas ejection ports 3. A gas burner 10 for heating the plastic sample 8 contained in the platinum crucible 9 is provided below the platinum crucible 9.
Are arranged.

The plurality of inert gas ejection ports 3 provided in the annular pipe portion 4 which constitutes the combustion suppressing device 1 for plastic carbonization has a diameter
It has a circular cross section of 2 mm, and its opening direction (injection direction of inert gas) is shown in FIG. 2 as a vertical sectional view and a top view of the annular pipe portion 4 (however, the support portion and the refractory container support portion are not shown). As shown in (), it is above the inner space as the annular body of the annular pipe portion 4. In other words, each inert gas ejection port 3 is
The opening is open upward in the internal space of the platinum crucible 9 supported by the refractory container support portions 7a, 7b and 7c.

Using the combustion suppressing device 1 for plastic carbonization of the present invention, the platinum crucible 9 and the gas burner 10 thus configured,
The supply amount of N ₂ gas from the inert gas introduction part 5 to the annular pipe 2 is ³ Nm ³ / hour (the total injection amount of N ₂ gas from the plurality of inert gas ejection ports 3 is 3 Nm ³ / hour), The amount of the plastic sample 8 is 40 g, the amount of liquefied petroleum gas (LPG) supplied to the gas burner 10 is 1 m ³ / hour (the surface temperature of the outer bottom surface of the platinum crucible 9 is 300
5) for various plastic samples
Carbonization operation was performed twice.

Table 1 shows the maximum height of the fire generated from each sample during carbonization, the presence or absence of spillage of the sample, and the average time from the start of carbonization to the end of carbonization (hereinafter referred to as the average carbonization time) of each sample.

Comparative Example A tripod having the same shape as that of the combustion suppressing device for carbonization of plastic 1 of the embodiment is used, except that the inert gas jet port 3 and the inert gas introducing portion 5 are not provided. According to the above, a platinum crucible of the same quality and the same shape as the platinum crucible 9 used in the example was supported, and the supply amount of liquefied petroleum gas (LPG) to the gas burner was 0.8 m ³ / hour (the surface temperature of the outer bottom surface of the platinum crucible was 250 m ³ / hr). C)) under the same conditions as in the example, but for each plastic sample of the same quality as the example, 5
Carbonization operation was performed twice.

Table 1 shows the maximum height of the flame generated from each sample during carbonization, the presence or absence of sample spillage, and the average carbonization time of each sample.

As is clear from Table 1, in the examples using the combustion suppressing device for plastic carbonization of the present invention, the height of the flame generated from the plastic sample during carbonization is 3.2 to 3.5 cm at the maximum, and 50 to 70 cm. Compared with the conventional method (comparative example), the safety of carbonization work is very high. Moreover, all the flames generated in the examples were spontaneously extinguished in a short time (5 to 10 seconds), and no bumping was observed.

In addition, since the plastic sample does not spill in the example, the ash content can be accurately determined. Furthermore, the average carbonization time of the example is 30 to 35 minutes, and heating, cooling, and reheating of the sample are repeated while lowering the heating temperature, and finally 4
Carbonization was carried out in a very short time as compared with the conventional method (comparative example) which required 6 minutes to 4 hours and 13 minutes.

The combustion suppressing device for plastic carbonization of the present invention is not limited to the shape shown in FIG. 1 and may have various shapes.

For example, the annular tube in the combustion suppressing device for plastic carbonization 1 shown in FIG. 1 has an annular shape, but as the annular body of the annular pipe forming the annular pipe portion in the combustion suppressing device for plastic carbonization of the present invention. The outer shape may be an annular shape capable of enclosing this refractory container or the internal space of the refractory container at or near the open surface side end of the refractory container with one end open for carbonization. It can be appropriately changed according to the outer shape.

Here, in the present specification, the "annular tube surrounding the internal space of the refractory container having one end open" means the following or an annular tube.

The interior space of the refractory container has an outer shape that is similar to or similar to the inner peripheral surface shape at the end of the open surface of the refractory container that is open at one end, and is placed on the end of the open surface side of this refractory container. An annular tube that surrounds the upper space.

A part of the upper part of the internal space of the refractory container that has an outer shape similar to or close to the shape of the inner peripheral surface at the end of the open surface of the refractory container that is open at one end. An annular tube that surrounds.

Further, the vertical cross-sectional shape of the annular pipe is not limited to the circular shape, and an elliptical shape, a rectangular shape or the like can be appropriately selected.

The cross-sectional shape of the inert gas ejection port forming the annular pipe portion is not limited to the circular shape as in the embodiment, but an elliptical shape,
It can have various shapes such as a prismatic shape, an amorphous shape, and a slit shape. Further, the number and opening direction of the inert gas ejection ports (the ejection direction of the inert gas) are also above the inner space of the refractory container containing the sample or above the inner space so as to surround these spaces. Is not particularly limited as long as it can be distributed.

For example, the inert gas jet port when the annular pipe portion is used outside the end of the open surface side of the refractory container as in the embodiment, including the direction directly above the annular pipe portion, is fire resistant. It suffices that the opening is made above the inner space of the container, in other words, above the inner space as the annular body of the annular pipe portion. In addition, the inert gas jet when the annular pipe portion is used on the open surface side end portion of the refractory container or above it, or inside thereof is used, the upper part of the content space of the refractory container or the inner space above, In other words, it suffices to open in the horizontal direction toward the inner space as the annular body of the annular pipe portion or toward the upper side of the inner space as the annular body of the annular pipe portion including the direction directly above the annular pipe portion.

In addition, when the annular pipe part is used in a refractory container by arranging it inside the end of the open surface side, if the opening direction of the inert gas jet is below the internal space of the refractory container, the interior of the refractory container It is not preferable because it becomes difficult to stagnate the circulation of the atmosphere between the space and the space outside the space, and the ignition of the gas generated from the sample due to heating may not be sufficiently suppressed and the sample may rapidly burn.

Further, the type of inert gas supplied to the annular tube is not limited to N ₂ gas as long as it can prevent the rapid combustion of the sample by suppressing the ignition of the gas generated from the sample by heating, N _In addition to the ₂ gases, CO ₂ gas, rare gases, etc. may be used. The amount of the inert gas supplied to this annular tube is not limited to the amount of ³ Nm ³ / hour which is the supply amount in the embodiment, and the type of the inert gas, the type and amount of the plastic sample, the refractory container It can be appropriately changed depending on the shape, the positional relationship between the refractory container and the annular pipe portion, and the like.

Further, the shape of the inert gas introducing portion for introducing the inert gas into the annular pipe is not limited to the shape shown in the embodiment, either directly from the inert gas supply source or via a conduit, As long as the inert gas can be introduced into the annular pipe, for example, it may be a gas outlet in the inert gas supply source or an opening forming a pair of male and female screws with one end of the conduit.

The combustion suppressing device for carbonization of plastics of the present invention comprises an annular pipe that directly or indirectly communicates with an inert gas supply source, and an inert gas ejection port through which the inert gas supplied to the annular pipe is ejected from the annular pipe. It suffices to have an annular pipe portion including at least the above, and the support portion and the refractory container support portion shown in the examples are not necessarily required.

A combustion suppressing device for plastic carbonization without a supporting part and a refractory container supporting part is, for example, a fireproof device having an inner diameter slightly smaller than the outer diameter as an annular body of an annular pipe forming the combustion suppressing device for plastic carbonization. It can be used by being supported by the inner wall of the sex container or the inner edge of the end portion on the open surface side. Alternatively, it can be used by being supported by the outer edge of the end portion on the open surface side of the refractory container having an outer shape slightly larger than the inner diameter as the annular body of the annular tube constituting the combustion suppressing device for plastic carbonization. Moreover,
The combustion control device for carbonizing the plastic is provided at the end of the open surface of the refractory container with one end opened or in the vicinity thereof, which is arranged in a predetermined positional relationship with a heating device such as a gas burner or an electric heater. It may be supported by another member at a position surrounding the internal space of the refractory container.

In addition, it is preferable that the gap between the annular pipe portion that constitutes the combustion suppressing device for carbonizing plastics of the present invention and the refractory container that is open at one end and that is used for carbonizing plastics is narrow. If this gap is too wide, it will be difficult to stagnate the circulation of the atmosphere between the inner space of the refractory container and its outer space, or the space consisting of this inner space and the space above it and its outer space. However, the ignition of the gas generated from the plastic sample by heating, that is, the rapid combustion of the plastic sample during carbonization cannot be sufficiently suppressed.

[Effect of the Invention] As described above, by using the combustion suppressing device for plastic carbonization of the present invention, carbonization is performed while suppressing rapid combustion of the sample even when the sample is heated at a relatively high temperature. be able to.

Therefore, by carrying out the present invention, it becomes possible to carbonize plastics safely, accurately and in a short time.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a combustion suppressing device for plastic carbonization of the present invention, and FIG. 2 is a vertical sectional view and a top view of an annular pipe portion constituting the combustion suppressing device for plastic carbonization shown in FIG. is there. 1 ... Combustion suppression device for carbonization of plastics 2 ... Annular pipe, 3 ... Inert gas ejection port, 4 ... Annular pipe, 8 ...
Plastic sample, 9 ... A fireproof container with one end open (platinum crucible).

Claims (1)

[Scope of utility model registration request] 1. A refractory container or an inside of the refractory container, which is directly or indirectly communicated with an inert gas supply source and has an open end on the open side of a refractory container containing a plastic sample or in the vicinity thereof. At least a ring-shaped tube surrounding the space and an inert gas outlet for discharging the inert gas supplied to the ring-shaped tube from the ring-shaped tube toward the upper part of the internal space of the refractory container or the upper part of the internal space. A combustion suppressing device for carbonization of plastics, which has an annular pipe portion.