JP2020132481A - Production method of dry ice and production device - Google Patents

Abstract

To provide a production method of dry ice which can improve production efficiency of block-shaped dry ice.SOLUTION: According to a production method, steps of: molding block-shaped dry ice D obtained by pressing dry ice snow N inside of a molding chamber A by a pressing body 1 and discharging molded block-shaped dry ice D from a molding chamber A, and; generating dry ice snow for generating dry ice snow N for supplying to a molding chamber A for molding the block-shaped dry ice D by injecting liquid carbon dioxide at a generation position B of the dry ice snow are performed in parallel, then, in the molding chamber A after completion of the molding step, pre-prepared setting supply amount of dry ice snow N is repeatedly supplied.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dry ice manufacturing method and a manufacturing apparatus for molding block-shaped dry ice by compressing the dry ice snow inside the molding chamber with a pressing body that reciprocates inside the molding chamber.

As a conventional example of a manufacturing method for producing such dry ice, a step of ejecting liquid carbon dioxide gas into the molding chamber to generate dry ice snow inside the molding chamber and pressing the dry ice snow inside the molding chamber. There is a method in which the process of molding dry ice by compressing with a body to mold block-shaped dry ice and discharging the molded block-shaped dry ice from a molding chamber is repeated (see, for example, Patent Document 1).

To add a description of a conventional dry ice production apparatus that executes a conventional dry ice production method, as shown in FIG. 6, liquid carbon dioxide gas is produced by processing carbon dioxide gas as a raw material supplied through the raw material path 6A. A liquefaction facility L is provided, and a supply path 32 for supplying a part of the liquid carbon dioxide gas produced in the liquefaction facility L to the ejection nozzle 31 provided in the molding chamber A is provided with a buffer tank 33 for supply. It is provided. A pressure adjusting valve 34 for adjusting the pressure of the liquid carbon dioxide gas is provided between the liquefaction facility L in the supply path 32 and the buffer tank 33 for supply, and the buffer tank 33 for supply in the supply path 32 and the buffer tank 33 for supply. An on-off valve 35 for controlling the supply of liquid carbon dioxide gas is provided between the ejection nozzle 31 and the ejection nozzle 31.

Then, in the step of generating dry ice snow, the on-off valve 35 is opened, liquid carbon dioxide gas is ejected from the ejection nozzle 31 into the molding chamber A, and the ejected liquid carbon dioxide gas is adiabatically expanded to dry ice. It is configured to produce snow.
By the way, the liquefaction facility L is provided with a product path 6B for discharging the produced liquefied carbon dioxide gas as a product.

Further, a gas recovery path F for recovering high-pressure carbon dioxide gas generated when producing dry ice snow N and supplying it to the liquefaction facility L is connected to the molding chamber A. Then, in the gas recovery path F, a recovery pressure control valve 36 for setting the pressure of the carbon dioxide gas to be recovered, a recovery buffer tank 37 for recovering the carbon dioxide gas whose pressure has been adjusted by the recovery pressure control valve 36, and the recovery A discharge pressure control valve 38 for setting the pressure of the carbon dioxide gas discharged from the buffer tank 37 and a compressor 39 for increasing the pressure of the carbon dioxide gas to a high pressure are provided, and the carbon dioxide gas recovered from the molding chamber A is collected. After being adjusted to high pressure, it is configured to be returned to the liquefaction facility L.

That is, in the conventional dry ice manufacturing apparatus, since the liquid carbon dioxide gas continuously produced in the liquefaction facility L is intermittently supplied to the molding chamber A, it is manufactured in the liquefaction facility L. A supply path 32 for supplying a part of the liquid carbon dioxide gas to the molding chamber A is provided with a buffer tank 33 for supply, and in addition, the amount of carbon dioxide recovered from the molding chamber A repeatedly fluctuates. On the other hand, in order to maintain a fixed amount of the recovered carbon dioxide gas returned to the liquefaction facility L, the gas recovery path F was provided with a buffer tank 37 for recovery.
In FIG. 6, 1 is a pressing body that moves up and down to mold block-shaped dry ice, 2 is a bottom frame that moves up and down to take out block-shaped dry ice, and 3 is a bottom frame 2 that raises and lowers block-shaped dry ice. It is an extruder to be dispensed from.

Japanese Unexamined Patent Publication No. 10-236814

Conventionally, the process of producing dry ice snow is performed by ejecting liquid carbon dioxide gas into the inside of the molding chamber, and the process of producing dry ice snow in the molding chamber and the process of molding block-shaped dry ice are performed. There is a problem that the production efficiency of dry ice is low because it is used for.

In other words, in order to generate dry ice snow by adiabatic expansion of the ejected liquid carbon dioxide gas by ejecting the liquid carbon dioxide gas, it is necessary to make the amount of the liquid carbon dioxide gas ejected per unit time appropriate. Therefore, the time required to generate the amount of dry ice snow required to mold the block-shaped dry ice of the required size is, for example, the same as the time required for the block-shaped dry ice molding process. , Will take a considerable amount of time.

As described above, as a result of the long time that the molding chamber is used for performing the process of producing dry ice snow, the production efficiency of the block-shaped dry ice cannot be improved, and improvement is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dry ice production method capable of improving the production efficiency of block-shaped dry ice.
Another object of the present invention is to provide a dry ice production apparatus capable of improving the production efficiency of block-shaped dry ice.

The dry ice manufacturing method of the present invention is to mold block-shaped dry ice by compressing the dry ice snow inside the molding chamber with a pressing body that reciprocates inside the molding chamber, and its characteristic configuration is Is
A molding step of compressing the dry ice snow inside the molding chamber with the pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber, and dry ice snow generation. The dry ice snow generation step of producing the dry ice snow by ejecting liquid carbon dioxide gas at the location to mold the block-shaped dry ice is performed in parallel, and then
It is characterized in that the supply step of supplying the dry ice snow of the set supply amount prepared in advance to the molding chamber after the completion of the molding step is repeated.

That is, when the molding process of compressing the dry ice snow inside the molding chamber with a pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber is performed, in parallel with this, A dry ice snow generation step is performed in which liquid carbon dioxide gas is ejected at a dry ice snow generation site different from the molding chamber to generate dry ice snow to be supplied to the molding chamber in order to mold block-shaped dry ice.

Next, when the molding step is completed, a supply step of supplying a set supply amount of dry ice snow prepared in advance by the dry ice snow generation step is performed in the molding chamber after the molding step is completed.
That is, the block-shaped dry ice is produced by repeating the molding process and the dry ice snow producing process in parallel and then the supply process.

Since the supply process of supplying the dry ice snow of the set supply amount created in advance to the molding chamber is to send the prepared dry ice snow to the molding chamber at once, the liquid carbon dioxide gas is molded in the time required for the supply process. It will be sufficiently shorter than the time to create a set supply of dry ice snow while spouting into the room.
As a result, the number of times the molding process is performed in the molding chamber per unit time can be increased, and the production efficiency of block-shaped dry ice can be improved.

In short, according to the characteristic configuration of the dry ice production method of the present invention, it is possible to improve the production efficiency of block-shaped dry ice.

A further characteristic configuration of the dry ice production method of the present invention is that the amount of the liquid carbon dioxide gas ejected is set to the amount of the dry ice snow generation step continuously performed.
In this description, "continuously performing the dry ice snow generation process" means that the dry ice snow generation site includes the supply process of supplying the dry ice snow of the set supply amount prepared in advance to the molding chamber, and the liquid carbon dioxide is generated at the dry ice snow generation site. Ejecting gas means that it is continuous.

That is, when dry ice snow is generated while ejecting liquid carbon dioxide gas at the dry ice snow generation site, high-pressure carbon dioxide gas is generated, but the dry ice snow generation process is continuously performed. Since high-pressure carbon dioxide gas is also continuously generated, it is possible to continuously and stably regenerate the recovered carbon dioxide gas into liquid carbon dioxide gas while recovering the generated carbon dioxide gas. The recovered carbon dioxide gas can be satisfactorily reused as liquid carbon dioxide gas.

In short, according to the further characteristic configuration of the dry ice production method of the present invention, it is possible to satisfactorily recover the high-pressure carbon dioxide gas generated at the dry ice snow generation site and reuse it as liquid carbon dioxide gas. ..

A further characteristic configuration of the dry ice production method of the present invention is that the liquid carbon dioxide gas from a liquefaction facility that processes carbon dioxide gas as a raw material to produce the liquid carbon dioxide gas is passed through the dry ice without passing through a buffer tank. Supply to the snow generation area,
It is characterized in that the carbon dioxide gas discharged from the dry ice snow generation site is returned to the liquefaction facility without passing through the buffer tank.

That is, the amount of liquid carbon dioxide gas ejected in the dry ice snow generation step is set to the amount of liquid carbon dioxide gas ejected continuously in the dry ice snow generation step, and the liquid carbon dioxide gas continuously supplied from the liquefaction facility is generated. Since the dry ice snow generation step is carried out in a form of continuously supplying a fixed amount to each location, the liquid carbon dioxide gas from the liquefaction facility is supplied to the dry ice snow generation location without passing through the buffer tank.

In addition, the dry ice snow generation step is performed in the form of continuously supplying a fixed amount of liquid carbon dioxide gas continuously supplied from the liquefaction facility to the dry ice snow generation site, so that the liquid carbon dioxide gas is discharged from the dry ice snow production site. Since the amount of carbon dioxide emitted will continue to be quantified, the carbon dioxide emitted from the dry ice snow generation site will be returned to the liquefaction facility without going through the buffer tank.

In short, according to a further characteristic configuration of the dry ice production method of the present invention, a buffer tank for the liquid carbon dioxide gas supplied from the liquefaction facility to the dry ice snow production site, and carbon dioxide returned from the dry ice snow production site to the liquefaction facility. By omitting the buffer tank for gas, it is possible to simplify the configuration for implementing this method.

A further characteristic configuration of the dry ice production method of the present invention is characterized in that the supply step is performed by moving the dry ice snow by gravity.

That is, in the supply process of supplying the dry ice snow of the set supply amount prepared in advance to the molding chamber, the dry ice snow is supplied to the molding chamber while moving due to the gravity.
As described above, since the dry ice snow is supplied to the molding chamber while being moved by the gravity, the equipment for supplying the dry ice snow to the molding chamber can be simplified.

In short, according to the further characteristic configuration of the dry ice manufacturing method of the present invention, it is possible to simplify the equipment for supplying the dry ice snow to the molding chamber.

A further characteristic configuration of the dry ice production method of the present invention is characterized in that the supply process is performed by moving the dry ice snow by a transport device.

That is, in the supply process of supplying the dry ice snow of the set supply amount prepared in advance to the molding chamber, the dry ice snow is supplied to the molding chamber while being moved by a transport device such as a screw conveyor.
In this way, since the dry ice snow is supplied to the molding chamber while being moved by the transport device, the dry ice snow can be accurately supplied to the molding chamber.

In short, according to the further characteristic configuration of the dry ice production method of the present invention, dry ice snow can be accurately supplied to the molding chamber.

The dry ice manufacturing apparatus of the present invention is a pressing body that reciprocates inside the molding chamber to compress the dry ice snow inside the molding chamber to mold block-shaped dry ice. Is
A molding unit that performs a molding step of compressing the dry ice snow inside the molding chamber with the pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber.
A dry ice snow generation unit that performs a dry ice snow generation step of generating the dry ice snow that is supplied to the molding chamber in order to mold the block-shaped dry ice by ejecting liquid carbon dioxide gas at the dry ice snow generation site. When,
The molding chamber is provided with a supply unit for performing a supply process for supplying the dry ice snow with a set supply amount prepared in advance.
The molding unit, the dry ice snow generation unit, and the dry ice snow generation unit, so that the molding step and the dry ice snow generation step are executed in parallel, and the supply step is repeatedly executed after the completion of the molding process. , A control unit for operating the supply unit is provided.

That is, when the molding process of compressing the dry ice snow inside the molding chamber with a pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber is performed, in parallel with this, A dry ice snow generation process is performed in which liquid carbon dioxide gas is ejected at a dry ice snow generation site separate from the molding chamber to generate dry ice snow that is supplied to the molding chamber to mold block-shaped dry ice. As described above, the molding portion and the dry ice snow generating portion are operated.

Next, when the molding process is completed, the supply unit is operated, and the dry ice snow of the set supply amount prepared in advance is supplied to the molding chamber after the completion of the molding process.
That is, the molding unit, the dry ice snow generation unit, and the supply unit are operated by the control unit so that the molding process and the dry ice snow generation process are performed in parallel, and then the supply process is repeated. Therefore, block-shaped dry ice will be produced.

Since the supply process of supplying the set amount of dry ice snow created in advance to the molding chamber is to send the prepared dry ice snow to the molding chamber at once, the liquid carbon dioxide gas is molded in the time required for the supply process. It will be sufficiently shorter than the time to create a set supply of dry ice snow while spouting into the room.
As a result, the frequency of performing the molding process in the molding chamber can be increased per unit time, and the production efficiency of block-shaped dry ice can be improved.

In short, according to the characteristic configuration of the dry ice production apparatus of the present invention, it is possible to improve the production efficiency of block-shaped dry ice.

A further characteristic configuration of the dry ice production apparatus of the present invention is that the amount of the liquid carbon dioxide gas ejected is set to the amount of the dry ice snow generation step continuously performed.
A supply path for supplying the liquid carbon dioxide gas from the liquefaction facility that processes carbon dioxide gas as a raw material to the dry ice production site is provided without a buffer tank.
A recovery path for returning the carbon dioxide gas discharged from the dry ice snow generation site to the liquefaction facility is provided without a buffer tank.

That is, the amount of liquid carbon dioxide gas ejected in the dry ice snow generation step is set to the amount of liquid carbon dioxide gas ejected continuously in the dry ice snow generation step, and the liquid carbon dioxide gas continuously supplied from the liquefaction facility is generated. Since the dry ice snow generation step is carried out in a form of continuously supplying a fixed amount to each location, a buffer tank should not be provided in the supply path for supplying the liquid carbon dioxide gas from the liquefaction facility to the location where the dry ice is produced.

In addition, the dry ice snow generation step is performed in the form of continuously supplying a fixed amount of liquid carbon dioxide gas continuously supplied from the liquefaction facility to the dry ice snow generation site, so that the liquid carbon dioxide gas is discharged from the dry ice snow production site. Since the amount of carbon dioxide emitted will continue to be quantified, a buffer tank should not be provided in the recovery path for returning the carbon dioxide emitted from the dry ice snow generation site to the liquefaction facility.

In short, according to a further characteristic configuration of the dry ice production apparatus of the present invention, a buffer tank for the liquid carbon dioxide gas supplied from the liquefaction facility to the dry ice snow production site, and carbon dioxide returned from the dry ice snow production site to the liquefaction facility. The buffer tank for gas can be omitted to simplify the overall configuration.

Schematic diagram of compressed dry ice production equipment Schematic diagram of the dry ice production equipment in the discharged state Schematic diagram of dry ice production equipment in the supply process Block diagram showing the control configuration Schematic diagram of the dry ice production apparatus of another embodiment Schematic diagram showing a conventional example of a dry ice manufacturing apparatus

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the same components as those in the above-described conventional example will be described with the same reference numerals.
(Overall configuration of dry ice manufacturing equipment)
As shown in FIGS. 1 to 3, in the dry ice manufacturing apparatus, the dry ice snow N inside the molding chamber A is compressed by the pressing body 1 that reciprocates inside the molding chamber A, and the block-shaped dry ice D is used. Is configured to mold.

That is, the dry ice manufacturing apparatus includes a molding unit P, a dry ice snow generation unit Q, and a supply unit R.
Then, as shown in FIG. 4, a control unit H for controlling the operation of the dry ice manufacturing apparatus is provided, and when the control unit H is instructed by the operation unit S to start an operation, the molding unit P and the dry It is configured to manufacture block-shaped dry ice D by controlling the operation of the ice snow generation unit Q and the supply unit R, the details of which will be described later.

[Details of molding part]
The molding unit P performs a molding step of compressing the dry ice snow N inside the molding chamber A with the pressing body 1 to mold the block-shaped dry ice D and discharging the molded block-shaped dry ice D from the molding chamber A. It is configured to do.
That is, as shown in FIG. 3, when the set supply amount of dry ice snow N is supplied to the molding chamber A with the pressing body 1 positioned at the upper standby position, the pressing body 1 is pressed as shown in FIG. The body 1 is lowered to compress the dry ice snow N, and the block-shaped dry ice D is formed.

When the molding of the block-shaped dry ice D is completed, as shown in FIG. 2, the bottom frame 2 forming the bottom of the molding chamber A is lowered with the block-shaped dry ice D placed on the block-shaped dry ice D. D is moved below the molding chamber A, and in that state, the block-shaped dry ice D is discharged from the bottom frame 2 by the extruder 3 that reciprocates in the horizontal direction.
Then, when the payout of the block-shaped dry ice D is completed, the pressing body 1 is raised to the upper standby position, and the bottom frame 2 is returned to the raised position forming the bottom of the molding chamber A. Further, the extruder 3 is configured to be returned and moved to the retracted position on the lateral side of the molding chamber A.

By the way, although not shown, the pressing body 1, the bottom frame 2, and the extruder 3 are each configured to be reciprocally driven by a driving device such as a hydraulic cylinder, and a block paid out from the bottom frame 2. The dry ice D is configured to be collected by the collection unit while being guided by the inclination guide unit or the like.

Further, the molding chamber A is provided with an exhaust gas passage 4 for exhausting low-pressure carbon dioxide gas generated by vaporizing a part of the dry ice snow N to the outside. As will be described later, the dry ice snow N is placed in the molding chamber A. It is configured to exhaust the low-pressure carbon dioxide gas generated when supplying to the outside.

[Details of dry ice snow generator]
As shown in FIGS. 1 to 3, the dry ice snow generating section Q ejects liquid carbon dioxide gas at the dry ice snow generating portion B and supplies it to the molding chamber A to mold the block-shaped dry ice D. It is configured to perform a dry ice snow generation process for producing dry ice snow N.

That is, a closed container 5 having a cylindrical shape or the like is provided, and a dry ice snow generation portion B is formed in the internal space thereof.
A liquefaction facility L for processing carbon dioxide gas as a raw material supplied through the raw material path 6A to produce liquid carbon dioxide gas is provided, and a part of the liquid carbon dioxide gas produced in the liquefaction facility L is used in the closed container 5. A supply path 7 for supplying the ejection nozzle 8 provided on the side wall is provided without a buffer tank. Then, the liquid carbon dioxide gas is ejected from the ejection nozzle 8 into the closed container 5, so that the ejected liquid carbon dioxide gas is adiabatically expanded to generate dry ice snow N.
The process for producing liquid carbon dioxide in the liquefaction facility L is a process of removing impurities in the carbon dioxide gas and a process of drying the carbon dioxide gas, and then cooling the carbon dioxide gas into a liquid carbon dioxide gas. Is.
By the way, the liquefaction facility L is provided with a product path 6B for discharging the produced liquefied carbon dioxide gas as a product.

A flow rate control valve 9 for controlling the amount of liquid carbon dioxide gas ejected by the ejection nozzle 8 is provided in the supply path 7, and the ejection amount ejected by the ejection nozzle 8 continues the dry ice snow generation step. It is set to the amount of ejection to be performed, and the details will be described later.

A gas recovery path 10 for recovering high-pressure carbon dioxide gas generated when dry ice snow N is generated is connected to the closed container 5, and the pressure of the carbon dioxide gas to be recovered is set in the gas recovery path 10. A pressure control valve 11 is provided.
Then, the carbon dioxide gas recovered through the gas recovery path 10 is adjusted to a high pressure by the compressor 12 and then returned to the liquefaction facility L through the return path 14.

In the present embodiment, the gas recovery path 10 and the return path 14 constitute a recovery path E for returning the carbon dioxide gas discharged from the dry ice snow generation location B to the liquefaction facility L, and this recovery is performed. The road E will be provided without a buffer tank.
By the way, the compressor 12 may be equipped in the liquefaction facility L so that the compressor 12 is not provided in the recovery path E.

[Details of supply section]
The supply unit R is configured to perform a supply step of supplying a predetermined supply amount of dry ice snow N to the molding chamber A.
In the present embodiment, the supply process is configured to move the set supply amount of dry ice snow N by gravity.

That is, the inclined transport cylinder 16 for connecting the outlet 5A at the bottom of the closed container 5 and the supply port 15 of the molding chamber A is provided, and the dry ice snow N generated inside the closed container 5 is generated. The pressure of carbon dioxide gas inside the closed container 5 moves to the inside of the transport cylinder 16, and the set amount of dry ice snow N stored inside the transport cylinder 16 falls and moves inside the transport cylinder 16 due to gravity. Therefore, it is configured to be supplied to the inside of the molding chamber A.

On the upstream side of the transport cylinder 16, the upstream side that moves in and out of the transport cylinder 16 and intermittently allows the dry ice snow N generated inside the sealed container 5 to flow into the transport cylinder 16. An opening / closing body 17 is provided, and on the downstream side of the transport cylinder 16, the dry ice snow N inside the transport cylinder 16 moves back and forth inside the transport cylinder 16 and intermittently flows toward the molding chamber A. A downstream opening / closing body 18 is provided.

Then, as shown in FIGS. 1 and 2, when the downstream opening / closing body 18 is closed and the upstream opening / closing body 17 is opened, the dry ice snow N generated inside the closed container 5 is conveyed. When the dry ice snow that flows inside the cylinder 16 is stored, and as shown in FIG. 3, when the downstream opening / closing body 18 is opened and the upstream opening / closing body 17 is closed, the inside of the transport cylinder 16 is stored. The dry ice snow N of the stored set supply amount is configured to be in the dry ice snow supply state in which it flows into the molding chamber A.

Although not shown, the transport cylinder 16 is provided with an exhaust port for discharging carbon dioxide gas flowing inside the transport cylinder 16 together with the dry ice snow N in the dry ice snow storage state.
Further, the upstream opening / closing body 17 and the downstream opening / closing body 18 are opened / closed by a driving device such as a fluid pressure cylinder.

By the way, in the present embodiment, when the amount of dry ice snow N stored in the closed state of the downstream opening / closing body 18 reaches the installation location of the upstream opening / closing body 17, the block-shaped dry ice D is molded. It is configured to store the set supply amount of dry ice snow N required for this purpose.

[Details of operation control]
The molding unit P, the dry ice snow generation unit Q, so that the control unit H repeatedly executes the molding process and the dry ice snow generation process in parallel, and executes the supply process after the molding process is completed. And, it is configured to operate the supply unit R.

In the present embodiment, the amount of liquid carbon dioxide gas ejected from the ejection nozzle 8 to the dry ice snow generation portion B is set to the ejection amount in which the dry ice snow generation step is continuously performed.
That is, the dry ice / snow generation process is configured to be continuously executed in parallel with the sequentially performed molding process and supply process.

To add an explanation, as shown in FIGS. 1 and 2, in the molding process, the supply unit R is in a dry ice snow storage state, and at the end of the molding process, as shown in FIG. 2, the inside of the transport cylinder 16 In addition, the set supply amount of dry ice snow N will be stored.

Then, as shown in FIG. 3, in the supply process, the supply unit R is in the dry ice snow supply state, and the set supply amount of dry ice snow N stored inside the transport cylinder 16 is supplied to the molding chamber A. Will be done.

Further, also in the supply process, the dry ice snow generation unit Q continues to eject the liquid carbon dioxide gas from the ejection nozzle 8 to the dry ice snow generation portion B, and the generated dry ice snow N is discharged from the closed container 5. The dry ice snow generation process is continued in the form of being stored inside.

Then, when the process shifts to the molding process and the supply unit R is in the dry ice snow storage state, the dry ice snow N stored inside the sealed container 5 flows inside the transport cylinder 16, and then the closed state. The dry ice snow N sequentially generated inside the container 5 (dry ice snow generation portion B) flows into the inside of the transport cylinder 16.

That is, the amount of liquid carbon dioxide ejected from the ejection nozzle 8 to the dry ice snow generation portion B is set to the ejection amount in which the dry ice snow generation step is continuously performed. It means that the molding step and the supply step are sequentially performed while performing the dry ice snow generation step in a form in which liquid carbon dioxide gas is continuously ejected to the production site B in a fixed amount.

Incidentally, the dry ice manufacturing apparatus of the present embodiment carries out a dry ice manufacturing method in which the molding step and the dry ice snow producing step are performed in parallel, and then the supply step is repeated.
However, specifically, the dry ice production apparatus of the present embodiment continuously executes the dry ice snow generation process in parallel with the molding process and the supply process which are sequentially performed, in other words, the dry ice snow production process. The dry ice production method is carried out in which the molding step and the supply step are sequentially performed while continuously performing the above steps.

Further, the dry ice production apparatus of the present embodiment supplies the liquid carbon dioxide gas from the liquefaction facility L that processes carbon dioxide gas as a raw material to produce the liquid carbon dioxide gas to the dry ice production site without passing through the buffer tank. In addition, a dry ice production method will be implemented in which the carbon dioxide gas discharged from the dry ice snow generation site B is returned to the liquefaction facility L without passing through the buffer tank.

[Another Embodiment]
Next, another embodiment will be described. Since this other embodiment shows another embodiment of the supply unit R and the other configurations are the same as those of the above embodiment, the parts different from the above embodiment The same parts as those in the above embodiment are designated by the same reference numerals as those in the above embodiment, and detailed description thereof will be omitted.

In this other embodiment, the supply process is configured to move the dry ice snow N by the transport device G.
That is, as shown in FIG. 5, as the transport device G, a screw conveyor equipped with a transport spiral body 20 is provided inside the tubular body 19.

Then, the upstream opening / closing body 17 is provided in a state of opening / closing the outlet portion at the lower end of the closed container 5, and the dry ice snow N generated inside the closed container 5 flows into the tubular body 19. The downstream opening / closing body 18 is provided so as to open / close the downstream portion of the tubular body 19, and the dry ice snow N inside the tubular body 19 is directed toward the molding chamber A. It is configured to intermittently flow.

Then, when the downstream opening / closing body 18 is closed and the upstream opening / closing body 17 is opened while driving the transport spiral body 20, the dry ice snow N generated inside the closed container 5 becomes a tubular body. When the dry ice snow storage state is stored inside the 19 and the downstream opening / closing body 18 is opened and the upstream opening / closing body 17 is closed while driving the transport spiral body 20, the transport cylinder 16 The dry ice snow N stored inside is configured to be in a dry ice snow supply state in which the dry ice snow N flows into the molding chamber A.

Although not shown, the cylinder 19 is provided with an exhaust port for discharging carbon dioxide gas flowing inside the transport cylinder 16 together with the dry ice snow N in the dry ice snow storage state.

By the way, in the present embodiment, the block-shaped dry ice D is molded when the amount of dry ice snow N stored in the closed state of the downstream opening / closing body 18 reaches the upstream side of the tubular body 19. It is configured to store the set supply amount of dry ice snow N required for this purpose.

Therefore, as in the above embodiment, in the molding process, the supply unit R is in the dry ice snow storage state, and in the supply process, the supply unit R is in the dry ice snow supply state and is stored inside the cylinder 19. The set supply amount of dry ice snow N is configured to be supplied to the molding chamber A.

Further, also in the supply process, the dry ice snow generation unit Q continues to eject the liquid carbon dioxide gas from the ejection nozzle 8 to the dry ice snow generation portion B, and the generated dry ice snow N is discharged from the sealed container 5. The dry ice snow generation process is continued in the form of being stored inside.

Then, when the process shifts to the molding process and the supply unit R is in the dry ice snow storage state, the dry ice snow N stored inside the closed container 5 is flowed inside the cylinder 19, and then the closed state. The dry ice snow N sequentially generated inside the container 5 (dry ice snow generation location B) flows into the inside of the cylinder 19.

That is, also in this other embodiment, the amount of liquid carbon dioxide gas ejected from the ejection nozzle 8 to the dry ice snow generation portion B is set to the ejection amount in which the dry ice snow generation step is continuously performed. In a form in which liquid carbon dioxide gas is continuously ejected from No. 8 to the dry ice snow generation portion B, the molding step and the supply step are sequentially performed while performing the dry ice snow generation step.

[Other Other Embodiments]
The other embodiments are listed below.
(1) In the above embodiment and another embodiment, the amount of liquid carbon dioxide gas ejected from the ejection nozzle 8 to the dry ice snow generation portion B is set to the ejection amount in which the dry ice snow generation step is continuously performed. However, the liquid carbon dioxide gas ejection amount may be set to the ejection amount at which the liquid carbon dioxide gas ejection is stopped in the supply step.

(2) In the above alternative embodiment, the screw conveyor is exemplified as the transport device G, but the transport device G is a device in which the transport gas such as carbon dioxide is pressed and moved, and a pressing body that reciprocates. Various types of equipment such as a device for pressing and moving and a device for pushing and moving with a rotary valve can be used.

(3) In the above embodiment and another embodiment, the case where the dry ice snow generation portion B is formed in the internal space of the closed container 5 such as a cylinder is illustrated. The specific configuration of the dry ice snow generation location B can be changed in various ways, such as forming inside a cylindrical body with an open bottom, and the specific configuration of the supply unit R can be changed accordingly.

It should be noted that the configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

1 Pressing body 7 Supply path A Molding chamber D Block-shaped dry ice E Recovery path H Control unit N Dry ice snow P Molding unit Q Dry ice snow generation unit R Supply unit L Liquefaction equipment

Claims (7)

A dry ice manufacturing method in which a block-shaped dry ice is molded by compressing the dry ice snow inside the molding chamber with a pressing body that reciprocates inside the molding chamber.
A molding step of compressing the dry ice snow inside the molding chamber with the pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber, and dry ice snow generation. The dry ice snow generation step of producing the dry ice snow by ejecting liquid carbon dioxide gas at the location to mold the block-shaped dry ice is performed in parallel, and then
A dry ice manufacturing method in which a supply step of supplying the dry ice snow of a set supply amount prepared in advance to the molding chamber after the completion of the molding step is repeated. The dry ice production method according to claim 1, wherein the amount of liquid carbon dioxide gas ejected is set to an amount of ejected that continuously performs the dry ice snow generation step. The liquid carbon dioxide gas from the liquefaction facility that processes carbon dioxide gas as a raw material to produce the liquid carbon dioxide gas is supplied to the dry ice snow generation site without passing through a buffer tank.
The dry ice production method according to claim 1 or 2, wherein the carbon dioxide gas discharged from the dry ice snow producing portion is returned to the liquefaction facility without passing through a buffer tank. The method for producing dry ice according to any one of claims 1 to 3, wherein the supply step is performed by moving the dry ice snow by gravity. The dry ice manufacturing method according to any one of claims 1 to 3, wherein the supply step is performed by moving the dry ice snow by a transport device. A dry ice manufacturing apparatus that compresses dry ice snow inside the molding chamber with a pressing body that reciprocates inside the molding chamber to mold block-shaped dry ice.
A molding unit that performs a molding step of compressing the dry ice snow inside the molding chamber with the pressing body to mold the block-shaped dry ice and discharging the molded block-shaped dry ice from the molding chamber.
A dry ice snow generation unit that performs a dry ice snow generation step of generating the dry ice snow that is supplied to the molding chamber in order to mold the block-shaped dry ice by ejecting liquid carbon dioxide gas at the dry ice snow generation site. When,
The molding chamber is provided with a supply unit for performing a supply process for supplying the dry ice snow with a set supply amount prepared in advance.
The molding unit, the dry ice snow generation unit, and the dry ice snow generation unit, so that the molding step and the dry ice snow generation step are executed in parallel, and the supply step is repeatedly executed after the completion of the molding process. , A dry ice manufacturing apparatus provided with a control unit for operating the supply unit. The amount of the liquid carbon dioxide gas ejected is set to the amount of the dry ice snow generation step continuously performed.
A supply path for supplying the liquid carbon dioxide gas from the liquefaction facility that processes carbon dioxide gas as a raw material to the dry ice snow production site is provided without a buffer tank.
The dry ice manufacturing apparatus according to claim 6, wherein a recovery path for returning carbon dioxide gas discharged from the dry ice snow generation site to the liquefaction facility is provided without a buffer tank.

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