Negative pressure prevention chamber

Abstract

To provide a negative pressure prevention chamber that can reliably and stably prevent the inside of a silo from becoming negative pressure.SOLUTION: A negative pressure prevention chamber 1 includes a hollow main body 2 that communicates with an exhaust port provided in a silo installed outdoors and has an opening 2d that opens into the environment, a communication portion 3 whose one end is connected to the exhaust port and whose other end 3b is connected to the main body 2 to communicate the main body 2 with the silo, and an inhibition structure 4 provided inside the main body 2. The inhibition structure 4 includes a partition plate 4A disposed between the communication portion 3 and the opening 2d so as to block the flow of gas inside the main body 2.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a moisture-preventing means for products stored in a silo, and in particular to a moisture-preventing means for preventing moisture absorption inside the silo. This prevents negative pressure from forming and inhibits moisture-laden outside air from entering the silo. Regarding the negative pressure prevention chamber. [Background technology]

[0002] Conventionally, silos for storing finished products and the like have been equipped with, for example, a bag filter installed on the top surface. The silo is designed so that gas inside can be exhausted through the exhaust port. As an example, Patent Document 1 describes a fly ash collection system that is installed outdoors to collect fly ash. A fly ash silo and a conveying facility on top of the fly ash silo that conveys ash. A bag filter is installed downstream of the main pipe, and the upper end of the bag filter is connected to the exhaust port of this bag filter. The document discloses a configuration including an exhaust pipe and a vacuum blower provided at the lower end of the exhaust pipe. An intake valve capable of drawing in atmospheric air is provided upstream of the conveying main pipe. In this configuration, the operation of the vacuum blower causes the bag filter and the transport header pipe to The pressure becomes negative and the air is drawn in through the suction valve, so the air flows from the main pipe to the bag filter. Therefore, outside air does not flow into the inside of the silo. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-161385 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the silos that store fly ash and products are installed outdoors, so they are not strong. It may be affected by wind, especially if a vacuum blower is not installed. When a strong wind blows around the exhaust port of the filter, the ejector effect caused by this strong wind This causes the gas inside the silo to be sucked out. When the negative pressure is created and outside air flows in, the stored product absorbs the moisture in the outside air, As a result, there is a problem that the quality of the product deteriorates. In addition, by-products may be generated during the manufacturing process of a product. Therefore, even after the removal process of these by-products, the by-products are still present in the finished product. Trace amounts may remain. If this by-product is, for example, gaseous hydrogen chloride, it reacts with the moisture absorbed by the product. In response to this, liquid hydrochloric acid is produced, which can corrode the silo. There was also a question. Therefore, we must prevent negative pressure inside the silo and prevent moisture in the outside air from being absorbed into the product. It is necessary to add a structure that can prevent this.

[0005] The present invention has been made to address such conventional circumstances, and is intended to The purpose of the present invention is to provide a negative pressure prevention chamber that can prevent the inside of the chamber from becoming negative pressure. do. [Means for solving the problem]

[0006] In order to achieve the above object, the first invention is a bag-filler provided in a silo installed outdoors. a hollow body communicating with the exhaust port of the filter and having an opening opening to the environment; One end is connected to the exhaust port, and the other end is connected to the main body, and the main body communicates with the silo. and an obstruction structure provided inside the main body, The barrier is characterized by being disposed between the communication part and the opening so as to block the flow of gas. In the invention having such a configuration, the shape of the main body may be, for example, cylindrical or cubic. The communication portion and the opening may be arranged on a straight line, or may not be arranged on a straight line. That's fine. Furthermore, the obstructing structure is disposed between the communication part and the opening of the main body, thereby preventing the communication part from being obstructed. Gas passing through the opening flows directly into the connecting part, and vice versa. In other words, it is possible to "block the flow of gas inside the main body." The term "gas passing through the communication part" refers to a gas flowing into the opening after changing its flow direction. The gas passing through the opening is made to flow into the communicating portion after changing its flow direction. This means that. In addition, the obstruction structure prevents gas passing through the exhaust port of the silo and gas passing through the opening of the main body. Any shape is acceptable as long as it does not completely block the flow of goods. Possible harmful structures include, for example, a maze structure or partitions.

[0007] In the invention having the above configuration, the main body is provided, so that strong winds do not blow around the exhaust port of the silo. In the event of a blowout, gases are prevented from being sucked out of the silo's exhaust port into the environment. In addition, the obstructing structure blocks the flow of gas between the communication part and the opening, so the gas inside the main body is not released. This prevents the gas inside the silo from being sucked out into the environment through the opening. This effectively prevents the liquid from passing through the opening of the main body and being sucked into the environment. This prevents the inside of the silo from becoming negative pressure.

[0008] Next, the second invention is the first invention, wherein the obstruction structure has at least a partition plate, The cutting plate is erected along the height direction from the bottom surface of the main body to the top surface of the main body, and The plate has a height that allows a gap to be formed between the upper end and the upper surface. In the invention having such a configuration, in addition to the function of the first invention, the partition plate The flow of gas between the communication part and the opening is blocked. The gas exhausted from the main body passes through the gap formed between the top end of the partition plate and the top surface of the main body. A body orifice is accessible. The partition board is preferably rigid, as this prevents strong winds from blowing around the opening of the main body. This is because the partition plate is unlikely to be damaged even if it is blown. For example, a horizontal plate protruding from the inner wall of the main body toward the central vertical axis of the main body may be provided. The horizontal plate not only projects along the radial direction of the main body, but also tilts relative to the radial direction. It may also protrude.

[0009] A third invention is the first or second invention, further comprising a first open end communicating with the opening, and a second The hollow body has an open end and has a hollow structure, and the cross-sectional area of ​​the hollow body other than the second open end is , which is larger than the opening area of ​​the second open end. In the invention having such a configuration, the cross-sectional area of ​​the hollow body other than the second open end is The opening area of ​​the opening end of the second opening may be any shape or length. In the invention having the above configuration, in addition to the effects of the first or second invention, the cross-sectional area of ​​the hollow body is Since the opening area of ​​the second opening end is larger than that of the first opening end, when a strong wind blows around the second opening end, Gas inside the main body is less likely to be sucked out through the second open end.

[0010] The fourth invention is any one of the first to third inventions, wherein the volume V of the main body is The subtraction value (V2-V1) obtained by subtracting the volume V from the intake volume of outside air (V2-V1) V1-V) changes from 0 to a positive number as the gas pressure inside the silo becomes negative. The intake volume (V2-V1) when the intake volume changes is expressed as follows: It is characterized by being given by equation 1).

number

[0011] In the invention having such a configuration, when negative pressure occurs inside the silo, the volume V2 is This can also be interpreted as the sum of the volume of the outside air that has flowed into the inside and the volume V1. The amount of air intake (V2-V1) is calculated by the ejector when a negative pressure chamber is not provided. The gas is sucked out from inside the silo by the - effect, and after the inside becomes negative pressure, is the volume of outside air sucked into the Therefore, even if (P1-P2) in equation (1) becomes large, the subtraction value (V2-V1-V) It is desirable for the body to have a volume V such that 0. However, since the body has a constant volume V, Therefore, when (P1-P2) becomes large, the inside of the silo gradually becomes negative pressure even if the main body is installed. In other words, since the volume V2 is large, the subtraction value (V2-V1-V) becomes a positive number from 0. and tends to gradually increase. Therefore, the volume V when the subtraction value (V2-V1-V) changes from 0 to a positive number is To prevent negative pressure inside the body as much as possible, the volume V of the body is optimal. This optimal volume V is obtained when the subtraction value (V2-V1-V) changes from 0 to a positive number. In this application, "negative pressure" refers to atmospheric pressure. The term "negative pressure decreases" refers to an increase in the absolute value of negative pressure. cormorant.

[0012] In the invention having the above configuration, in addition to the function of any one of the first to third inventions, the silo In order to prevent negative pressure as much as possible, a body having an optimum volume V is determined.

[0013] The fifth invention is the invention according to any one of the first to fourth inventions, wherein the product stored in the silo is It is characterized by containing hydrogen chloride as a by-product. In the invention having such a configuration, in addition to the effects of any one of the first to fourth inventions, The pressure prevention chamber prevents outside air from entering the silo through the main body. This prevents moisture from reacting with the gaseous hydrogen chloride by-product inside the silo. The production of liquid hydrochloric acid is prevented. [Effects of the Invention]

[0014] According to the first aspect of the present invention, the inside of the silo is provided with a main body and an obstructing structure, so that the inside of the silo is protected from stress. This prevents pressure from building up, preventing outside air from entering the silo through the main body. Therefore, the product stored in the silo may absorb moisture from the outside air, and this moisture may be transferred to the product. This can prevent the reaction with the by-products of the oxidizing agent to produce harmful compounds. In addition, the negative pressure prevention chamber can be installed without modifying the inside of the silo. This allows for easy retrofitting.

[0015] According to the second invention, in addition to the effect of the first invention, the partition plate separates the communication portion and the opening portion. The flow of gas between the filter and the filter is blocked, while the gas passing through the bag filter's exhaust port Since it can pass through the opening of the main body, the inside of the silo is kept clean while ensuring exhaust from the silo. It is possible to prevent negative pressure from occurring. In addition, if the partition has sufficient strength, it will prevent negative pressure from forming inside the silo. It can be prevented reliably and stably.

[0016] According to the third invention, in addition to the effects of the first or second invention, when a strong wind blows, The gas inside the silo becomes difficult to suck out from the second open end, causing negative pressure inside the silo. This can further prevent the following.

[0017] According to the fourth invention, in addition to the effect of any one of the first to third inventions, the silo has a negative pressure. In order to prevent this as much as possible, the body with the optimum volume V is determined. It is possible to reliably prevent outside air from entering the color.

[0018] According to the fifth aspect of the present invention, in addition to the effects of any one of the first to fourth aspects of the present invention, The bars prevent the formation of liquid hydrochloric acid inside the silo. This can prevent corrosion of the silo caused by hydrochloric acid. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is an external view showing an installation state of a negative pressure prevention chamber according to an embodiment. [Figure 2] FIG. 2 is an enlarged view showing the installation state of a negative pressure prevention chamber according to the embodiment. [Figure 3] FIG. 1 is a perspective view showing the appearance of a negative pressure prevention chamber according to an embodiment. [Figure 4] 10 is a perspective view for explaining the operation of the negative pressure prevention chamber according to the embodiment. FIG. [Figure 5] 10 is a graph illustrating the operation of the negative pressure prevention chamber according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0020] The negative pressure prevention chamber according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG. 1 is an external view showing the installation state of a negative pressure prevention chamber according to an embodiment. 2 is an enlarged view showing the installation state of the negative pressure prevention chamber according to the embodiment. As shown in FIGS. 1 and 2, the negative pressure prevention chamber 1 according to the embodiment is installed outdoors. It is installed on the top surface 52 of a metal silo 50. First, the silo 50 will be described. The silo 50 stores, for example, powdered products. The top of Silo 50 is 30m above ground level. Therefore, Silo 50 is regularly exposed to strong winds. The products stored in the silo 50 may be subject to by-products generated during the manufacturing process. Therefore, even after the removal process of these by-products, the finished product A small amount of by-products may remain in the product. For example, there are those containing gaseous hydrogen chloride. Therefore, a bag filter is provided on the top surface 52 of the silo 50 to vent the gaseous by-products. The bag filter 51 is provided with an exhaust port 51a. Both include a filter body 51b. Therefore, if the negative pressure prevention chamber 1 is not provided, strong winds will blow around the exhaust port 51a. As the air is blown, gas is sucked out from the exhaust port 51a, creating a negative pressure inside the silo 50. This negative pressure causes the outside air containing moisture to flow out of the exhaust port 51a. This results in the waste flowing into Silo 50.

[0021] Next, the configuration of the negative pressure prevention chamber according to the embodiment will be described in detail with reference to FIG. 3. FIG. 3 is a perspective view showing the appearance of the negative pressure prevention chamber according to the embodiment. The components shown in FIG. 2 are denoted by the same reference numerals in FIG. 3, and the description thereof will be omitted. do. As shown in FIG. 3, the negative pressure prevention chamber 1 has a hollow body 2 and the body 2 is connected to a silo 5 0, a blocking structure 4 provided inside the main body 2, and a In this embodiment, a box body 5 is used as the hollow body. The main body 2, the communication part 3, the obstruction structure 4 and the box body 5 are all made of stainless steel plate material. It becomes. The main body 2 is a circular body surrounded by a peripheral wall 2a having a thickness of 5 mm, a top surface 2b, and a bottom surface 2c. The silo 50 has a columnar outer shape and is provided with a bag filter 51 having an exhaust port 51a (see FIG. 1). 2) through a communication section 3. Furthermore, the main body 2 has a box-shaped The main body 2 has an opening 2d that opens to the environment through a hole 5. The internal size of the main body 2 is 0.5m and height 1.1m. Therefore, the volume of the main body 2 is about 0.22m 3 (=220L) This becomes: The communication section 3 is a bent pipe having one end 3a and the other end 3b. The other end 3b is connected to the exhaust port 51a of the filter 51 (see FIG. 2). a is connected at a height position near the bottom surface 2c of a. Furthermore, the obstructing structure 4 is disposed midway between the other end 3b of the communicating portion 3 and the opening 2d. The obstruction structure 4 is erected along the Z direction from the bottom surface 2c of the main body 2 to the top surface 2b of the main body 2. The partition plate 4A has sufficient rigidity to be able to withstand the load. The thickness of the partition plate 4A is 5 mm.

[0022] In addition, in the negative pressure prevention chamber 1, the axis center A1 of the other end 3b of the communication part 3 and the axis center A2 of the main body 2 The axial centers A2 of the openings 2d are parallel to each other. The partition plate 4A is a rectangular strip having an upper end 4a, a lower end 4b, and both side ends 4c, 4c. It is a flat stainless steel plate material and is arranged along a direction perpendicular to the axial centers A1 and A2. Furthermore, the partition plate 4A has a lower end 4b fixed to the bottom surface 2c of the main body 2. has a height H that allows a gap S to be formed between its upper end 4a and the upper surface 2b of the main body 2. Specifically, the height H from the lower end 4b to the upper end 4a along the Z direction is 1.0 m. Therefore, the height and area of ​​the gap S along the Z direction are 0.1 m and 0.05 m, respectively. 2 and become. The partition plate 4A has both ends 4c, 4c fixed to the inner surface of the peripheral wall 2a of the main body 2. are.

[0023] Next, the box body 5 has a first open end 5a communicating with the opening 2d of the main body 2 and a second open end 5b. It has b. Specifically, the box body 5 is attached to the outside of the peripheral wall 2a at a height position close to the bottom surface 2c of the main body 2. The thickness of the stainless steel flat plate that forms the box body 5 is 2 mm. m. Furthermore, the box body 5 has a first open end 5a on the surface that contacts the peripheral wall 2a, and this first open end The second opening end 5b is provided on the surface that is perpendicular to the peripheral wall 2a. The size of the parallel planes is approximately 0.5m in height along the Z direction and 0.5m in the X direction perpendicular to the Z direction. The depth d in the direction is about 0.2 m. The surface where the second opening end 5b opens and the surface The parallel planes are all approximately 0.5m high in the Z direction, and The width w in the orthogonal Y direction is about 0.2 m. The second open end 5b has a substantially square shape. Each side is approximately 0.2 m in size. Therefore, the cross-sectional area S1 along the YZ plane of the box body 5 other than the second opening end 5b is Therefore, the gas inside the main body 2 flows through the second opening end 5b. It becomes difficult to be sucked out from b.

[0024] Next, the operation of the negative pressure prevention chamber according to the embodiment will be explained with reference to FIGS. 4 and 5. 4 is a perspective view for explaining the operation of the negative pressure prevention chamber according to the embodiment. The components shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 4. The explanation will be omitted. As shown in FIG. 4, the air exhausted from the exhaust port 51a of the bag filter 51 (see FIG. 1) Body A irThe water flows down the communication part 3 towards the other end 3b and into the main body 2. The partition plate 4A is disposed between the communication portion 3 of the main body 2 and the opening 2d of the main body 2, and the axis center A of the other end 3b Since it is arranged perpendicular to 1, gas A ir The parting plate 4A is struck by the surface near the lower end 4b. The flow direction is changed toward the upper surface 2 b of the main body 2 . Therefore, the partition plate 4A is disposed between the other end 3b of the communication portion 3 and the opening 2d of the main body 2. This allows the gas passing through the other end 3b to flow toward the opening 2d without changing direction. It is possible to inhibit the following. And gas A ir When passing through the gap S, the flow direction is changed to the direction of the lower end 4b. The opening 2d of the main body 2 (i.e., the first opening end 5a of the box 5), the second opening It is exhausted to the environment through end 5b.

[0025] The second open end 5b is located near the top surface 52 of the silo 50 and is adjacent to the main body 2. Since they are arranged in contact with each other, it is difficult for strong winds to directly enter through the second open end 5b of the box body 5. Even if outside air caused by a strong wind enters through the second open end 5b, this outside air will After passing through the opening end 5a, the air collides with the partition plate 4A, and its flow direction changes to the direction of the upper surface 2b. Therefore, the partition plate 4A changes the direction of the outside air passing through the first opening end 5a. It is possible to prevent the fluid from flowing toward the other end 3b of the communication portion 3 without causing the fluid to flow. The height position of the second opening end 5b is lower than the height position of the opening 2d. The peripheral wall 2a below the opening 2d does not block the flow of gas from the other end 3b toward the opening 2d. However, the outside air entering through the second opening end 5b is absorbed by the opening Therefore, the water flows upward along the peripheral wall 2a below the second opening end 5b. The flow of outside air entering through the second opening is blocked by the peripheral wall 2a. This further strongly prevents penetration into the interior of the main body 2 through the end 5b. As described above, the partition plate 4A prevents the gas passing through the other end 3b of the communication portion 3 from passing through the first opening of the box body 5. Gas passing through the first opening end 5a flows directly into the other end 3b. On the other hand, the partition plate 4A can prevent the exhaust of the bag filter 51 from leaking. The gas passing through the gas port 51a (see FIG. 1) and the gas passing through the second open end 5b of the box body 5 This does not completely block the distribution of

[0026] Next, Table 1 shows the optimum volume V of the main body 2 in the negative pressure prevention chamber according to the embodiment. 1 is a table showing the results of calculations to determine the volume of the silo 50. x10 5 (L), which was carried out when the negative pressure prevention chamber 1 was not installed. That is why.

[0027] [Table 1]

[0028] As shown in Table 1, the first column from the left shows the results when negative pressure occurs inside the silo 50. is the gas pressure P2 (gauge pressure, kPa) inside the Next, the second column from the left shows the inside of the silo 50 when no negative pressure is generated inside the silo 50. The volume of gas in V1 (150 m 3 =1.5×10 5 L).

[0029] The third column from the left shows the volume V2( m 3 ) This volume V2 is calculated using equation (2) described later.

[0030] Furthermore, the fourth column from the left shows the situation where the silo 50 is exhausted as a result of the negative pressure generated inside the silo 50. The intake amount (V2-V1) of the outside air taken in through the air port 51a. 1) is given by the following equation (1).

[0031]

number

[0032] where: V1: Volume of gas when no negative pressure is generated inside the silo (m 3 ) V2: Volume of gas when negative pressure occurs inside the silo (m 3 ) P1: Gas pressure when no negative pressure is generated inside the silo (Pa abs) P2: Gas pressure when negative pressure occurs inside the silo (Pa abs) is. The volume V2 is the boiling point when there is no temperature change before and after the negative pressure is generated in the silo 50. Based on the law, it is calculated using the following formula (2).

[0033]

number

[0034] In equation (2), the pressures P1 and P2 are both absolute pressures (Pa abs). However, the actual measured value of pressure P1 is 0.03 (kPa) in gauge pressure. The pressure P2 (gauge pressure, kPa) is the amount of outside air drawn in when the inside of the silo 50 becomes negative pressure. This is an arbitrary value for calculating (V2-V1). Therefore, in equations (1) and (2), the pressures P1 and P2 (in gauge pressure) are used during calculation. Add atmospheric pressure (kPa) to the pressure P1 and P2 to obtain the absolute pressure (kPa abs) The values ​​used are:

[0035] The rightmost column is [inhalation volume (V2-V1)-volume V of main body 2]. Here, the value in the rightmost column is a positive value because when negative pressure occurs, the air is sucked out of the exhaust port 51a. This means that the volume of the outside air drawn into the air conditioner 50 exceeds the volume V of the main body 2. Therefore, even if the negative pressure prevention chamber 1 is provided, the flow of outside air into the silo 50 In other words, the volume V of the main body 2 is the volume of the silo 50 having a certain volume. The subtraction value (V2-V1-V) obtained by subtracting the volume V from the intake volume of outside air (V2-V1) However, as the gas pressure inside the silo 50 becomes negative, it changes from 0 to a positive number. The amount of outside air intake (V2-V1) is the amount of outside air intake when the pressure P2 is -0 .15(kPa).

[0036] FIG. 5 is a graph for explaining the operation of the negative pressure prevention chamber according to the embodiment. In FIG. 5, the horizontal axis indicates the gas pressure (kPa) inside the silo 50, and the vertical axis indicates the The figure 50 is the amount of intake air (V2-V1) (L). The pressure shown on the horizontal axis is The pressure P2 is the first column from the left in Table 1, and the intake volume of outside air (V2-V1) is the pressure P2 in the first column from the left in Table 1. The values ​​are in the rightmost column shown in the table. As shown in FIG. 5, when the pressure P2 in the silo 50 becomes lower than −0.15 (kPa), As the air pressure increases, the amount of air taken in (V2-V1) increases linearly. As shown in Table 1, the value of [inhalation volume (V2-V1) - volume V of main body 2] in the rightmost column is the negative pressure when the volume of silo 50 is 1.5 x 10 5 (L) (i.e. , the volume of the gas V1 is 1.5×10 5 (L)), the volume V of the main body 2 is 220 (L ) or more, it can be seen that the value in the rightmost column is unlikely to be a positive number. Therefore, if the volume of Silo 50 is 1.5 x 10 5 (L), the volume V of the main body 2 By setting the volume of the silo to 220 (L) or more, the pressure P2 inside the silo 50 becomes -0.15 (kPa). Even if the upper limit of the volume V of the main body 2 is There is no particular reason, but it will be decided taking into consideration cost and practical operation.

[0037] As described above, the negative pressure prevention chamber 1 is provided with the main body 2 and the partition plate 4A. This prevents the inside of the silo 50 from becoming negative pressure, so that the outside air can pass through the main body 2. Therefore, the product stored in the silo 50 can be prevented from flowing into the silo 50. It absorbs moisture from the outside air and reacts with gaseous hydrogen chloride, a by-product of the product. This can prevent the generation of liquid hydrochloric acid. In addition, from the experimental results shown in Figures 4 and 5, it can be seen that the negative pressure prevention chamber 1 prevents the inside of the silo 50 from being damaged. It has been demonstrated that this method can prevent negative pressure from occurring.

[0038] Furthermore, the negative pressure prevention chamber 1 includes a main body 2, a communication section 3, a partition plate 4A, and a box body 5. This is a simple configuration, and the inside of the silo 50 becomes negative pressure without requiring power such as a pump. This prevents the need for a dedicated network, thereby reducing installation and maintenance costs. In addition, since the main body 2 and the partition plate 4A are both made of stainless steel, it can be installed outdoors. In this case, it has sufficient strength to withstand strong winds and corrosion resistance that reduces the risk of corrosion due to rain or snow. Therefore, the product life of the negative pressure prevention chamber 1 can be expected to be extended. In particular, the partition plate 4A has sufficient strength to withstand strong winds, and therefore is not required to be installed in the conventional art. There is no risk of damage to the silo 50, and the inside of the silo 50 can be reliably and stably prevented from becoming negative pressure.

[0039] The partition plate 4A is configured to prevent the gas passing through the other end 3b of the communication portion 3 from reaching the first opening end 5a of the box body 5. Conversely, the gas passing through the first open end 5a flows directly into the other end 3b. On the other hand, the gas passing through the exhaust port 51a of the bag filter 51 and Since the gas flow passing through the second opening end 5b of the box body 5 is not completely blocked, It prevents product degradation and silo 50 corrosion without interfering with the important task of exhausting by-products. This can solve the previously difficult problem of preventing foodborne illness.

[0040] In addition, the negative pressure prevention chamber 1 can be installed in the communication section 3 without modifying the inside of the silo 50. It can be installed by connecting one end 3 a to the exhaust port 51 a of the bag filter 51 . Therefore, the negative pressure prevention chamber 1 has sufficient strength to be installed outdoors. This makes it possible to reliably and stably prevent the inside of the silo 50 from becoming negative pressure, and Since there is no need to modify the 0 itself, it can be easily retrofitted.

[0041] The negative pressure prevention chamber according to the present invention is not limited to those shown in the examples. The main body 2 may have a shape other than a cylindrical shape. A tube may be used. The obstruction structure 4 may be a labyrinth structure instead of the partition plate 4A. Furthermore, the combination of the height H of the partition plate 4A and the height of the gap S is 1.0 m and 0.0 m, respectively. Combinations other than 0.1m are also possible. And instead of the box body 5, a tapered circular A tube may also be used. In addition, the products stored in the silo 50 contain gaseous hydrogen chloride as a by-product. In addition to the above, the catalyst may contain by-products other than gaseous hydrogen chloride. Examples of by-products other than gaseous hydrogen chloride include nitrogen oxides. The product may not contain the by-product itself. [Industrial Applicability]

[0042] The present invention is a negative pressure prevention device for preventing negative pressure from occurring inside a silo installed outdoors. It can be used as a chamber. [Explanation of symbols]

[0043] 1...Negative pressure prevention chamber 2...Main body 2a...Surrounding wall 2b...Top surface 2c...Bottom surface 2d...Opening Mouth part 3...Communication part 3a...One end 3b...Other end 4...Inhibition structure 4A...Partition plate 4a...Top end 4b...lower end 4c...side end 5...box body 5a...first opening end 5b...second opening end 50 ...Silo 51...Bag filter 51a...Exhaust port 51b...Filter body 52...Top surface

Claims

1. a hollow body that communicates with an exhaust port of a bag filter provided in a silo installed outdoors and has an opening that opens to the environment; a communication part having one end connected to the exhaust port and the other end connected to the main body, thereby communicating the main body with the silo; An obstruction structure is provided inside the main body, the obstructing structure is disposed between the communication portion and the opening portion so as to obstruct the flow of gas inside the main body, and includes at least a partition plate; A negative pressure prevention chamber characterized in that the partition plate is erected in a vertical direction from the bottom surface of the main body to the top surface of the main body, and has a height that allows a gap to be formed between the upper end of the partition plate and the top surface.

2. a hollow body having a first open end communicating with the opening and a second open end, and having a hollow structure; 2. The negative pressure prevention chamber according to claim 1, wherein the cross-sectional area of ​​the hollow body at a portion other than the second open end is larger than the opening area of ​​the second open end.

3. A hollow body that communicates with an exhaust port of a bag filter provided in a silo installed outdoors and has an opening that opens into the environment; a communication part having one end connected to the exhaust port and the other end connected to the main body, thereby communicating the main body with the silo; An obstruction structure is provided inside the main body, the obstructing structure is disposed between the communication portion and the opening portion so as to obstruct the flow of gas inside the main body; The volume V of the main body is the intake volume of outside air that the silo takes in through the exhaust port (V ２ -V １ ) minus the volume V, ２ -V １ -V) changes from 0 to a positive number as the gas pressure inside the silo becomes negative. ２ -V １ ) and The amount of inhalation (V ２ -V １ ) is given by the following formula (1): [Equation 1] where: V １ : Volume of gas when no negative pressure is generated inside the silo (m ３ ) V ２ : Volume of gas when negative pressure occurs inside the silo (m ３ ) P １ : Gas pressure when no negative pressure is generated inside the silo (Pa abs) P ２ : Gas pressure when negative pressure occurs inside the silo (Pa abs)

4. 4. The negative pressure prevention chamber according to claim 1, wherein the product stored in the silo contains hydrogen chloride as a by-product.

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