JP2000119013A - Apparatus for producing pellet-like dry ice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing pellet-like dry ice in a high yield, capable of usefully recovering a highpurity carbon dioxide gas vaporizing in a molding device for compressing molding a snowlike dry ice into a pellet state. SOLUTION: A fine pressure difference meter 32 is arranged in a housing 11 of a molding apparatus 1 for obtaining a dry ice formed into a pellet state by jetting and expanding a liquefied carbon dioxide gas to form a snowlike dry ice, compressing the dry ice by rotary rollers revolving along the inner face of the peripheral wall of a cylinder, packing it into molding holes and extruding it to the outside of the peripheral wall on the inner face of a peripheral wall of a die which is cylindrical and is equipped with the plural molding holes passing through the peripheral wall along the vertical wall. A recovery blower 31 capable of being subjected to inverter control changing a sucked amount according to the signal of the fine pressure difference meter is installed in the housing and the recovery blower 31 is successively equipped with a compressor and a freezer. Positive pressure is always kept in the housing 11 of the molding apparatus 1 to recover and to reuse an excessive vaporized carbon dioxide gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing dry ice pellets having a small shape, such as a rod, which is easy to distribute, and in particular, suppresses pressure increase in a housing of a pellet molding machine to improve production efficiency. The present invention relates to an apparatus for producing pelletized dry ice.

[0002]

2. Description of the Related Art In carrying or transporting frozen foods and the like, it is common practice to keep them cool using dry ice in order to prevent thawing between them. In recent years, the dry ice has been subdivided and produced in the form of a pellet-like dry ice such as a stick so as to be easily distributed and used effectively. For example, a molding apparatus shown in FIG. 3 is used as a molding machine for producing the dry ice pellets. That is, FIG. 3 is a schematic cross-sectional view for explaining an example of an apparatus for forming a pellet-shaped dry ice.

[0003] In FIG. 3, a molding apparatus 1 is formed by forming a plurality of molding holes H of a desired diameter penetrating the peripheral wall 2b along the peripheral wall 2b along the peripheral wall 2b. A die 2 is provided, and a bottom 2 of the die is provided.
At the upper end of the rotating shaft 3 rotatably disposed through the center of a, a cone-shaped snow-like dry ice collecting member 4 whose apex is cut and whose vertical section is trapezoidal is fixedly arranged, Further, on the bottom 4a of the snow-like dry ice collecting member 4, an outer peripheral wall 5a is spaced apart from the inner wall of the peripheral wall 2b of the die 2 by a certain gap t to a height position where the forming hole H is arranged. A plurality of cylindrical rotating rollers 5 are rotatably supported by a shaft 6 parallel to the cylinder core so as to be positioned. A turntable 7 that rotates around the center of the rotating shaft 3 of the snow-like dry ice collecting member 4 along the outer periphery of the bottom surface 2a of the die 2 is suspended by the driving members 8 and 8. A cutting rod 9 is provided on the upper surface of the turntable 7 and stands upright in parallel with the peripheral wall at a position facing the forming hole H on the outer surface of the peripheral wall 2b of the die 2.

[0004] The molding apparatus 1 in which the respective element members are arranged as described above has an exhaust port 10 at the top and is hermetically surrounded by a hollow cylindrical housing 11 preferably having heat insulation. An injection nozzle 12 for spraying a plurality of liquefied carbon dioxide gas is provided at an upper portion in the housing 11 so as to be ejected in a tangential direction of a peripheral wall surface of the housing 11. Housing 1
In the lower part of 1, an outlet opening 13 is provided in accordance with the outer peripheral end position of the turntable, and an unloading shooter 14 is arranged. Further, a baffle plate 15 is provided on the inner wall 11a of the housing 11 near the outlet opening 13, and the baffle plate 15 has a narrow gap between its lower surface 15a and the upper surface of the turntable 7. 7 extends toward the center. Accordingly, the baffle plate 15 functions to block the pellet-shaped dry ice carried on the turntable 7 and to be guided to the outlet 13. Reference numeral 16 denotes an electromagnetic valve attached to the liquefied carbon dioxide gas injection nozzle 12, and reference numeral 17 denotes a base for installing and supporting equipment such as the die 2.

[0005] Such conventional dry eye pellets
The device 1 for forming pellets is operated as follows,
Produces lye ice. Open the solenoid valve 16 and
Liquefied carbon dioxide Z_LFrom the injection nozzle 12 to the housing 11
Liquefied carbon dioxide gas expands into snow-like
Lyice Z_SAnd the inner wall surface inside the housing 11
The dies 2 and the rotating rollers 5 fall in a spiral orbit.
And the inner surface of the peripheral wall 2b of the die 2
Guided by the gap t between the outer peripheral wall 5a of the rotating roller 5 and
Collected and accumulated. During this time, the drive motor (not shown)
The rotation of the collecting member 4 connected to the rotating shaft 3 being moved
At the same time as rolling, it is disposed rotatably at the bottom of the collecting member 4.
The rotating rollers 5, 5 extend along the inner wall of the peripheral wall 2 b of the die 2.
To rotate. As a result, the peripheral wall 2b of the die 2
In the gap t between the inner surface of the roller and the outer peripheral wall 5a of the rotating roller 5.
Snowy dry ice Z collected and accumulated_STo the rotating roller 5
Therefore, it is compressed toward the inner wall surface of the peripheral wall 2b of the die.
Then, the molding holes H formed in the peripheral wall 2b are compressed and filled one by one.
And is pushed into the forming hole H and passes therethrough to form the peripheral wall 2b.
The outer wall is formed into a rod-like shape corresponding to the punching die of the forming hole H.
Dry ice Z _PCome out as extruded.

[0006] A cutting rod 9 erected on the upper surface of the turntable 7 rotating along the outer periphery of the bottom surface 2 a of the die 2 in accordance with the arrangement height of the forming H formed in the peripheral wall 2 b of the die 2. but wherein the plurality of growth of the length of the dry ice Z _P of the rod-like coming extruded from the molding hole H provided in the peripheral wall 2b, which contact to the predetermined desired and cut into lengths pellet form The dry ice Z _P falls on the rotating turntable 7. The pelletized dry ice Z _P on the turntable 7 which led to outlet opening 13 of the housing 11 in the rotation of the turntable 7 is paid by baffle plate 15, from the shooter 14 is collected is led to outlet opening 13 It is carried out. In addition,
The length of the dry ice pellet is, of course, increased to the desired length by changing the rotation speed of the turntable 7 on which the cutting rod 9 is erected, as well as increasing the distance between the outer surface of the peripheral wall 2b and the cutting rod 9. can do.

[0007] However, in manufacturing the pelletized dry ice Z _P is, as described above, the liquefied carbon dioxide Z
_The latent heat generated by the vaporization of a part of _L cools the liquefied carbon dioxide gas to produce snow-like dry ice Z _S
The obtained, in which the production of dry ice pellets Z _P are allowed compression molding solidifying it. But In the production, the liquefied carbon dioxide Z _L by a temperature drop allowed jet expansion, and when generating snow-like dry ice Z _S, is vaporized when allowed to compression molding solidifying snow-like dry ice Z _S vigorously, about 30 to 40% amount of the introduced injected liquefied carbon dioxide Z _L only not contribute to dry ice production, that is about 60 to 70 percent remaining is discharged to the outside becomes carbon dioxide It is a fact.

[0008] From the viewpoint of cost reduction and prevention of global warming, a recovery system is required to recover the vaporized carbon dioxide gas, re-liquefy it, and reuse it as a raw material for dry ice production. Has been proposed. FIG. 4 is a schematic system diagram illustrating an example of a pelletized dry ice production device provided with a recovery system. Components common to those of the apparatus shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0009] That is, in FIG.
At 0, the liquefied carbon dioxide gas Z _L stored in the liquefied carbon dioxide gas storage tank 21 is supplied via the outlet valve 22 and the pipe 23 to the electromagnetic valve attached to the pellet-shaped dry ice forming apparatus 1 as shown in FIG. 16 and is injected into the dry ice forming apparatus 1 from an injection nozzle connected to the valve 16. The pelletized dry ice Z _P by driving operation as described based on FIG. 3 in the device 1
Is manufactured. Then, in this case pellets dry ice forming apparatus 1, the jet expansion liquefied carbon dioxide Z _L, also be partially vaporized during compression molding of the snow-like dry ice Z _S in the housing 11 gaseous The carbon dioxide gas Z _G becomes full. This is sucked and collected by the compressor 25 through the pipe line 24, and the compressor 25 raises the pressure to (20 kgf / c
m ² ), is fed to a refrigerator 27 via a pipe 26, cooled and liquefied into liquefied carbon dioxide gas Z _L, and collected and stored in a liquefied carbon dioxide gas storage tank via a pipe 28.

However, the amount of the gaseous carbon dioxide gas generated by vaporization in the pellet-shaped dry ice forming apparatus 1 thus collected depends on, for example, a change in the temperature of the pellet-shaped dry ice forming apparatus 1 and the amount of the gaseous carbon dioxide. It fluctuates depending on various ambient conditions such as a change in the pressure of the liquefied carbon dioxide gas supplied to 1 and operation conditions, and is not constant. On the other hand, in the compressor 25 used for the recovery, since the suction compression capacity is constant, the amount of carbon dioxide generated by vaporization in the pelletized dry ice forming apparatus 1 is reduced by the compressor 2.
When the compression capacity exceeds 5, the inside of the housing 11 of the pellet-shaped dry ice forming apparatus 1 has an excessive positive pressure, so that carbon dioxide gas is wastefully discharged to the atmosphere from the outlet 13 or the like. .

Conversely, when the amount of carbon dioxide gas generated by vaporization becomes smaller than the compression capacity of the compressor 25, the inside of the housing 11 of the pellet-shaped dry ice forming apparatus 1 becomes negative pressure, and the forming holes H and Air or moisture may enter the pellet-shaped dry ice forming device 1 through the slit of the housing 11, or snow-like dry ice generated in the housing 11 may be sucked into the compressor 25 side, and the pellet-shaped dry ice may be formed. In addition to the decrease in the yield of the carbon dioxide gas, problems such as a decrease in the purity of the carbon dioxide gas due to the incorporation of oxygen and moisture into the collected carbon dioxide gas occur. In order to reuse the poorly-purified carbon dioxide gas, the carbon dioxide gas is separately purified by a refining apparatus, which leads to an increase in the number of steps and an increase in the production price.

[0012]

SUMMARY OF THE INVENTION
Regarding the change in the amount of carbon dioxide gas evaporating in the housing of the pellet-shaped dry ice forming device, the pressure inside the housing is always maintained at a constant positive pressure without fluctuating, enabling operation with a high production yield. At the same time, the emergence of a pellet-shaped dry ice manufacturing apparatus capable of recovering the recovered carbon dioxide gas without impairing its purity has been desired. In view of the above situation, the present invention always responds to fluctuations in the amount of carbon dioxide gas generated by vaporization in the molding apparatus during the production of pelletized dry ice, so that the inside of the housing of the pelletized dry ice molding apparatus is always kept in a dark state. In order to maintain the pressure, the suction flow rate to the compressor provided in the recovery system is automatically adjusted to avoid the influence of the compression capacity of the compressor on the pellet-shaped dry ice forming apparatus, and the purity of the carbon dioxide gas recovered. It is an object of the present invention to provide a pelletized dry ice manufacturing apparatus capable of always maintaining high purity and maintaining the best production yield.

[0013]

According to a first aspect of the present invention, there is provided an apparatus for producing dry ice pellets according to the first aspect of the present invention. A pellet-shaped dry ice forming apparatus for compressing snow-shaped dry ice formed by injecting carbon dioxide gas to form a pellet-shaped dry ice is provided with a blower for recovery in communication with the inside of the housing. The outlet of the blower is connected to the liquefied carbon dioxide gas storage tank via a compressor and a refrigerator in this order. According to a second aspect of the present invention, there is provided the pelletized dry ice manufacturing apparatus, wherein the recovery blower adjusts the suction amount in accordance with a signal from a detector provided in the housing and detecting a state in the housing. The apparatus for producing dry ice pellets according to claim 1, further comprising a control system. In the apparatus for producing dry ice pellets according to the third aspect of the present invention, the detector provided in the housing for detecting a state in the housing is at least one of a differential pressure gauge, an oximeter, and a moisture meter. The apparatus for producing dry ice pellets according to claim 2, characterized in that:

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pellet-shaped dry ice producing apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram illustrating an example of the pelletized dry ice producing apparatus of the present invention. In FIG. 1, the same reference numerals are given to the same components as those in the conventional apparatus shown in FIGS. 3 and 4, and the detailed description is omitted. The pelletized dry ice producing apparatus 30 of the present invention includes a collecting blower 31 in a pipe 24 connecting the pelletized dry ice forming apparatus 1 and the compressor 25 in the conventional pelletized dry ice producing apparatus 20 shown in FIG. In addition to this, a micro differential pressure gauge 32 is installed in the housing 11 of the pellet-shaped dry ice forming apparatus 1. The recovery blower 31 includes an inverter control mechanism M.
The blower is a blower that detects a minute pressure change in the housing 11 by a small differential pressure gauge 32 installed in the housing 11 and receives a signal generated from the signal, and changes the frequency as needed to finely control the rotation speed.

In the pelletized dry ice producing apparatus 30 of the present invention, for example, the amount of gaseous carbon dioxide generated by vaporization in the housing 11 of the pelletized dry ice forming apparatus 1 is increased, and When the pressure in the inside 11 rises more than necessary, the slight differential pressure gauge 32 installed in the housing 11 detects this and sends a signal corresponding to the differential pressure from the set pressure. When this is transmitted to the inverter M of the recovery blower 31 via the conducting wire 33, the inverter M operates to increase the rotation speed of the recovery blower 31 according to the differential pressure. Then, the supply amount of the recovered carbon dioxide gas to the subsequent compressor 25 increases accordingly. During this time, the pressure in the housing 11 decreases, and when the pressure reaches a predetermined set pressure, the recovery blower 31 is operated while maintaining a constant rotation speed, and the pressure in the housing 11 is maintained at a predetermined slightly positive pressure state. It is operated with good yield.

On the other hand, when the amount of gaseous carbon dioxide generated by vaporization in the housing 11 of the pellet-shaped dry ice forming apparatus 1 is reduced and the pressure in the housing 11 is reduced more than necessary, the pressure is reduced to the housing. The differential pressure gauge 32 installed in the sensor 11 similarly detects and transmits a signal corresponding to the differential pressure from the set pressure. This is transmitted to the inverter M of the recovery blower 31 via the conducting wire 33, and as a result, the inverter M operates to lower the rotation speed of the recovery blower 31 according to the pressure difference. Then, the supply amount of the recovered carbon dioxide gas to the compressor 25 at the subsequent stage decreases accordingly. Thereby, the pressure in the housing 11 of the pellet-shaped dry ice forming apparatus 1 rises to the set pressure, and at the same time, the rotation speed of the recovery blower 31 increases and returns to the normal rotation speed.
Then, when the pressure reaches a predetermined set pressure, the recovery blower 31 is operated while maintaining a constant rotational speed, the pressure in the housing 11 is maintained at a predetermined slightly positive pressure state, and the operation is performed with a high yield.

As described above, in the pellet-shaped dry ice manufacturing apparatus 30 of the present invention, carbon dioxide gas generated by vaporization in the pellet-shaped dry ice forming apparatus 1 is passed through the recovery blower 31 having the inverter control mechanism M. Compressor 2
5 and the rotation of the blower 31 for collection is tracked according to the sequential detection signal of the differential pressure gauge 32 provided in the housing 11 of the dry ice forming apparatus 1 for pellets. Since the pressure is controlled to increase and decrease, the pressure in the housing 11 is always maintained at the set slightly positive pressure. Therefore, intrusion of air into the pellet-shaped dry ice forming apparatus 1 can be prevented, and not only can the carbon dioxide gas to be recovered be recovered without lowering its purity, but also a good yield can be obtained for dry ice forming production. It can be performed under the best conditions.

In the above embodiment, an example was described in which the fine differential pressure gauge 32 was used as a detector for detecting the state inside the housing of the pellet-shaped dry ice forming apparatus 1; The detector for detecting the state in the sensor 11 is not limited to the fine differential pressure gauge, and may use a detector for measuring an undesirable impurity such as an oxygen concentration meter or a dew point meter for measuring moisture. . Also, if the temperature of the recovered carbon dioxide gas sucked into the recovery blower 31 is low, the driving parts in the blower are cooled and distortion occurs, which may change the performance of the blower due to a dimensional change. For this reason, it is more preferable to provide a heat exchanger for bringing the temperature of the inhaled carbon dioxide gas to a temperature close to room temperature before inhaling it into the blower 31.

[0019]

EXAMPLE In order to confirm the performance of the pelletized dry ice producing apparatus 30 of the present invention shown in FIG. 1, the following confirmation experiments were conducted. [Experiment 1] Pellet dry ice was produced using a pellet dry ice production apparatus having the system diagram shown in FIG. The specifications of each device used are as follows. ● Pellet dry ice forming device 1 Production capacity (nominal): 200 kg / hr. (PT-200 manufactured by Nippon Sanso Corporation) Liquefied carbon dioxide purity: 99.99% or more Liquefied carbon dioxide gas supply: 555 to 580 kg / hr Exhaust carbon dioxide gas volume: 340 to 380 kg / hr. ● Recovery blower 31 Processing air volume: 60 to 250 m ³ / hr. With inverter control mechanism (ARJ-065 manufactured by Unosawa Co., Ltd.)
● Compressor 25 Processing capacity: 1000m ³ / hr. Compressive pressure: 20kgf / cm ² ● Refrigerator 27 Refrigeration temperature: -20 ° C or less Refrigeration method: Mechanical refrigeration ● Micro differential pressure gauge 32 Minimum differential pressure detection value: 10mmAq

In the pelletized dry ice manufacturing apparatus of the present invention comprising the above-described components, the pressure in the housing 11 of the pelletized dry ice forming apparatus 1 is changed, and the pelletized dry ice forming apparatus at each pressure is changed. The oxygen concentration in the first housing 11 was measured. Figure 2 shows the result.
The graph in which the horizontal axis indicates the pressure (mmAq) in the housing 11 and the vertical axis indicates the scale of the oxygen concentration (ppm) in the housing 11 is shown.

As is apparent from FIG. 2, the recovery blower 3
In the operation in which the rotational speed of 1 is increased and the generated carbon dioxide gas in the housing 11 of the pellet-shaped dry ice forming apparatus 1 is sucked to operate the housing 11 at a pressure of -200 mmAq, the oxygen concentration in the housing 11 is about It became 800 ppm. Further, the pressure in the housing 11 is reduced to -300 m.
In the operation reduced to the state of mAq, the oxygen concentration in the housing 11 increased to about 3.5% (3.5 × 10 ⁴ ppm). The carbon dioxide gas recovered at this time was purified by removing impurities such as oxygen, nitrogen, and moisture by a purifier, then liquefied by a refrigerator, and collected in a liquefied carbon dioxide gas storage tank 21.
At this time, the snow-like dry ice generated in the pellet-shaped dry ice forming apparatus 1 is sucked together with the carbon dioxide gas into the recovery blower 31, and the production capacity of the pellet-shaped dry ice forming apparatus 1 in the pellet-shaped dry ice forming apparatus 1 is reduced. Admitted.

Next, the number of rotations of the recovery blower 31 is reduced, the carbon dioxide gas generated in the housing 11 of the pellet-shaped dry ice forming apparatus 1 is sucked, and the pressure in the housing 11 is changed from +100 mmAq to 1000 mmAq. The production operation was started. As a result, during the pressure change in the housing 11 during this time, the oxygen concentration in the housing 11 is kept almost constant at about 5 ppm, and the carbon dioxide gas recovered by the recovery blower 31 needs to be purified using a purifier. Purity is maintained and the compressor 2
5. Liquefied through the refrigerator 27, the liquefied carbon dioxide gas storage tank 21
And collected. However, as the pressure in the housing 11 of the pellet-shaped dry ice forming apparatus 1 increases, the carbon dioxide gas generated in the housing 11 is not sucked and collected by the collecting blower 31, and
A part of the gas spilled out from the exhaust port 10 and wasted to the atmosphere.

As described above, in the pellet dry ice manufacturing apparatus of the present invention, the pressure in the housing 11 of the pellet dry ice forming apparatus 1 is reduced by using the blower with the inverter control mechanism for the recovery blower 31. In contrast to the setting of 200 mmAq, the pulsation of the pressure change in the housing 11 can be kept within the range of ± 100 mmAq, and can always be maintained at the positive pressure. As a result, the production yield of the pellet-shaped dry ice was maintained well, the purity of the carbon dioxide gas to be recovered could be maintained at a high purity, and the pellet-shaped dry ice could be produced in a stable state.

[0024]

The apparatus for producing dry ice pellets according to the present invention is constructed and implemented in the above-described embodiment, and has the following effects. That is, the state of the pressure and the like in the housing of the pellet-shaped dry ice forming device is detected between the pellet-shaped dry ice forming device and the compressor that collects and compresses the carbon dioxide vaporized in the housing of the forming device. Since a recovery blower equipped with a mechanism for controlling the number of rotations in accordance with this was installed, the pressure of the pellet-shaped dry ice forming apparatus could be maintained at a substantially constant value by setting the pressure of the pellet-shaped dry ice forming apparatus to a positive pressure. The best pressure condition for production is maintained, and the production yield can be improved.

Further, since the above-mentioned recovery blower is a blower operated by an inverter control mechanism, the suction amount of the recovery blower can be reduced even with a small pressure fluctuation in the housing of the pellet-shaped dry ice forming apparatus. Following this, it can be controlled to fluctuate, and the operation of the pellet-shaped dry ice forming apparatus can be maintained in an extremely stable pressure state, and the pellet-shaped dry ice can be produced more efficiently. . Moreover, by using the blower for recovery, the pressure in the housing of the pellet-shaped dry ice forming apparatus can be controlled so as not to be a negative pressure, and the surrounding air is not entrained in the housing. The excess carbon dioxide in the housing recovered by the blower is kept at high purity, and is immediately liquefied through a compressor and a refrigerator to form liquefied carbon dioxide and collected and stored in a liquefied carbon dioxide gas storage tank. Is done. And since it can be effectively reused, the production yield can be improved, and so on.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram illustrating an example of an apparatus for producing dry ice pellets according to the present invention.

FIG. 2 is a graph showing a change in oxygen concentration in a housing 11 due to a pressure change in a housing of the pellet-shaped dry ice forming apparatus.

FIG. 3 is a schematic cross-sectional view for explaining an example of an apparatus for forming pellet-shaped dry ice.

FIG. 4 is a schematic system diagram illustrating an example of a conventional pelletized dry ice production device provided with a recovery system.

[Explanation of symbols]

1 ... Pellet dry ice forming device 2 ... Dice
3 ... rotating shaft, 4 ... snow-like dry ice collecting member, 5 ...
Rotary roller, 7: turntable, 9: cutting rod, 1
0 ... exhaust port, 11 ... housing, 12 ... injection nozzle, 13 ... outlet opening, 14 ... unloading shooter, 15
... baffle plate, 16 ... solenoid valve 17 ... base, H ... molding hole,
t ... gap, Z _L ... liquefied carbon dioxide, Z _S ... snow-like dry ice, Z _P ... pelleted dry ice, M ... inverter control mechanism, 30 ... pelleted dry ice production device 21 ... liquefied carbon dioxide storage tank of the present invention , 22 ... Valve, 2
3, 24, 26, 28 ... conduit, 25 ... compressor, 27 ...
Refrigerator, 31 ... Blower for recovery, 32 ... Small differential pressure gauge 3
3 Conductor, M: Inverter control mechanism

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F25J 1/02 F25J 1/02 (72) Inventor Hiroto Hirano 1-167-1 Nishishinbashi, Minato-ku, Tokyo No. Nippon Oxide Corporation F term (reference) 4D047 AA05 CA06 4G004 AA03 EA00 MA00 4G046 LA06 4G075 AA23 AA61 AA65 AA70 BD09 EA01 EB01 EC01 ED04

Claims (3)

[Claims] 1. A dry ice pellet formed by injecting liquefied carbon dioxide gas into a housing with a spray nozzle connected to a liquefied carbon dioxide gas storage tank to form a pellet-shaped dry ice. The molding apparatus is provided with a collecting blower in communication with the inside of the housing, and an outlet of the collecting blower is connected to the liquefied carbon dioxide gas storage tank through a compressor and a refrigerator in order. Pellet dry ice manufacturing equipment. 2. The collection blower according to claim 1, further comprising an inverter control system for adjusting an amount of suction in accordance with a signal from a detector provided in the housing and detecting a state in the housing. 2. The apparatus for producing dry ice pellets according to 1. 3. A detector provided in the housing for detecting a state in the housing is at least one of a differential pressure gauge, an oximeter, and a moisture meter.
4. The apparatus for producing dry ice in the form of a pellet according to 1.