JPS5831516B2 - Gas holder for gas containing foul odor - Google Patents

Description

Detailed Description of the Invention The present invention temporarily stores gas containing bad odors, etc., which is generated with discontinuous and large flow rate fluctuations, and continuously and quantitatively supplies it to subsequent processes such as bad odor treatment. This is related to a gas holder for.

Traditionally, this type of gas holder has been a bellows type made of cloth (commonly called a diaphragm) coated with or laminated with rubber or synthetic resin, etc., for use in blowing exhaust gas from batch-type digesters in kraft pulp manufacturing equipment. There are spherical or broken sphere type so-called Qi-shu type types, but these are caused by the repeated bending of the diaphragm, which is a moving part, the elution of diaphragm constituents by terpenes contained in the gas, or by foul-smelling substances. Gas leakage is likely to occur due to damage to the diaphragm due to corrosion, etc.

Furthermore, in order to prevent this gas leakage, the material of the diaphragm has been improved to fluororubber, etc., but there is a limit to the extension of the service life, and since high-grade materials are used, the cost increases.

As a method to solve this drawback, JP-A-51-1121
5, in contrast to the diaphragm type described above, ``the box-shaped sealed chamber is divided into several upper and lower stages, and a part of the top stage is provided with a gas inlet and a gas outlet, and each stage has opposing partitions. A gas holder has been proposed in which the upper and lower chambers are communicated sequentially by forming a communication part in the gas holder, and an air inlet that communicates with the outside air is provided at the tip of the lowest stage, so that the gas holder is substantially air-sealed from the outside. .

Since this system does not use any diaphragm, it has some new and unique drawbacks, although the damage to the diaphragm, which is a drawback of the conventional diaphragm type gas holder, has been improved.

Specifically, 1. Generally, the temperature of the stored gas is higher than the temperature of the outside air to be replaced, and the gas component contains a large amount of water vapor.

On the other hand, the gas-contacting parts inside the gas holder (e.g., shelves serving as separators) are first exposed to low-temperature air that is equal to the outside temperature and the temperature is lowered. When the gas is replaced with air, water vapor condenses on the surface of the gas contact area, which was at a low temperature.

This phenomenon occurs in all parts of the gas contact area, but especially on shelf boards, which are horizontal or slightly inclined, the removal effect of condensed water is insufficient and the condensed water forms a thick water film or a puddle. and stays there.

On the other hand, since this gas contains methyl mercaptan and other malodorous substances, these malodorous substances dissolve in the condensed water and turn into malodorous water.

Subsequently, as this gas is supplied to the malodor treatment process, fresh outside air enters and replaces it, but the malodorous condensed water on the shelves remains as it is.

For this reason, while some of the malodorous substances are in contact with the condensed water, they re-evaporate into the fresh air, and this air becomes mixed and contaminated with malodorous substances.

Therefore, when this air is flowed out of the gas holder to store the gas that will be generated next, the air is already contaminated with foul-smelling substances, so it is not effective as a gas holder for the purpose of preventing foul odors. , the number of deaths will be reduced by this amount.

2. A box-shaped airtight container is divided into upper and lower levels by several shelves, but in order to hold these shelves horizontally, a support mechanism with sufficient strength is required.・Struts・Struts・
Hanging devices, etc. must be used alone or in combination.

In addition, the shelf board itself needs to be strong, and in order to use a board with low strength, measures such as narrowing the spacing between the support mechanisms must be taken, which may result in an increase in equipment costs. However, from the viewpoint of strength, the materials used are generally limited, such as stainless steel plates with a thickness of about 1 to 2 min, or steel plates with a similar thickness coated with a corrosion-resistant agent such as epoxy resin.

3. The height of the part that serves as the gas flow path is the distance between the shelf boards, but even if this distance is 50 to 60
Even if it were about 1.5 cm, you would not be able to enter the interior inspection without lying on your stomach.

In addition, there are problems with the strength of the shelf board or the retention of water containing malodorous components in the recesses caused by distortion of the shelf board itself, and in reality, it is extremely difficult to easily enter the interior after operation.

In contrast, the present invention temporarily stores gas containing malodorous components that are generated discontinuously and with large flow rate fluctuations, and continuously and quantitatively stores the gas containing malodorous components etc. In order to supply gas to the gas, the inside of a box-shaped, cylindrical, etc. airtight container is separated to form a series of gas flow channels, one end of which is connected to the gas inlet and outlet. In a gas holder whose other end is open to the atmosphere as an air outflow and inflow port, the separator plate is set vertically from the bottom surface, the bottom surface in contact with the floor is sloped, and a discharge groove is provided to create a gas flow path. This gas holder is characterized by having rectifier plates installed at several locations.

According to the present invention, since the separator is vertical, condensed water generated on the surface of the separator due to the alternating replacement of gas and steam quickly flows down 2 and does not accumulate on the surface of the separator.

Furthermore, the condensed water that has flowed down to the bottom flows from the sloped bottom surface into the narrow groove at the bottom, which greatly reduces the contact surface between the condensed water and the air, allowing for the replacement of odorous substances by re-evaporation. It becomes possible to reduce air pollution as much as possible.

In addition, since the load is applied directly to the ridges of the separator and the floor surface, there is no need for a support mechanism for receiving the load of the shelf board as in the upper and lower partition type.

That is, although studs, body butts, etc. are necessary as a separator fixing mechanism to fix the separator in a predetermined position and prevent movement, deformation, etc., it is extremely simple.

In particular, in the case of a cylindrical type, the separator itself is curved in one direction only, so it is resistant to bending stress (if only the top and bottom are fixed, fixing the middle part can be further simplified).

On the other hand, by standing the separator vertically, gravity has no relation to the bending stress acting on this plate, and therefore, the lateral force applied to the separator is the same as that of the adjacent flow path separated by the separator. The only bending stress is due to the pressure difference between the gases, but this pressure difference is usually about the same as the number of water columns.

This stress is so small that the separator can withstand it without much strength.

Therefore, in addition to 1~2vt4 steel plates and stainless steel plates, for box-shaped, house-shaped, etc. gas holders that use flat plates, inexpensive materials such as asbestos slate plates or pulp cement plates with a thickness of about 5~8 mm can be used. However, it is fully usable.

The present invention will be explained in detail below based on the drawings.

1, 2, and 3 show a plan view, a side view, and an elevation view of the basic form of the present invention.

It is a house-shaped airtight container that has a volume of about 130 to 200% of the amount of gas required to be stored in an outer box 11 made of stainless steel plate or the like, and has a gas inlet 2 in the lower left corner of the plan view, and a gas outlet 2 in the upper right corner. An air inflow/outflow lower is opened at the corner.

Inside this container body (gas holder), the entire height from the top surface of the outer box 11 to the floor surface 8 is divided into several rows of gas flow paths 14 by several separators 5 erected perpendicularly to the floor surface 8. It is.

The flow path 14 is connected to the adjacent flow path 14 and the communication port 1, respectively.
5, and the gas inflow/outflow inlet 2 and the air inflow/outflow lower are connected as if forming a series of gas passages that can be bent.

The gas inlet/outlet 2 is provided with a dispersion plate 4 for uniformly distributing and inflowing the gas vertically.

In addition, in order to prevent drift due to differences in gas specific gravity, rectifier plates 6 as shown in FIG. 10 are installed at several points in the middle of the gas flow path 14 at right angles to the path and can be easily attached and detached using bolts, hooks, etc. Installation.

As shown in FIGS. 8 and 9, a sloped bottom surface 9 is provided with waterproof mortar or the like, and a narrow drain outlet groove 12 is formed at the lowest part with an undulating slope along the longitudinal direction of the channel 11. The drain discharge pipe 10 is connected to the lowest point in some places.

Furthermore, as a safety measure in case abnormal pressure or the like occurs, rupture discs 13 are provided at several locations on the upper part of the outer box 11.

For example, blow gas containing foul-smelling substances that is generated intermittently from a batch wood kettle in kraft pulp manufacturing equipment due to blowing, etc. flows out of the exhaust stack 1 through the blow tank, blow gas condenser, etc., and is sent to the foul-smelling gas processing equipment. However, the flow gas that exceeds the processing capacity of this malodorous gas treatment equipment is transferred from the gas outlet 2 to the gas flow path 1 by the dispersion plate 4.
The gas flows into the inside of the gas holder while being dispersed at an approximately uniform speed over the entire upper and lower portions of the gas holder.

The inflowing gas is adjusted by rectifying plates 6 placed at several locations in the gas flow path 14 so that there is no significant difference in flow velocity at the upper, middle, and lower foot portions of the gas flow path 14. Therefore, the inflowing gas does not cause extreme drift due to the difference in specific gravity, and flows in the direction of the air inflow/output lower while sequentially replacing and filling the gas flow path 14 from the gas inlet/outlet 2 with air to correspond to the amount of inflowing gas. reach the point.

As a result, the air that was originally in the gas holder is pushed out by the incoming gas and released into the atmosphere from the air inflow and outflow lower.

The amount of blow gas discharged normally decreases rapidly within 1 to 2 minutes after the start of blowing, but if the outflowing gas becomes less than the processing capacity of the malodorous gas treatment equipment, the gas stored in the gas holder will be discharged from the gas outlet. 2, the gas stored in the gas holder is quantitatively supplied to the malodorous gas treatment equipment in an amount corresponding to the shortage.

As this gas is taken out, external air flows into the gas holder from the air inflow/outflow lower and replaces the gas one by one.

When the malodorous gas generated in this manner with large flow rate fluctuations passes through this gas holder and is released into the atmosphere, the fluctuation in the discharge flow rate is almost the same as that in the generation state, but it contains malodorous substances. Not released as air.

In addition, the flow rate of the malodorous gas sent to the malodorous gas processing equipment does not change at all when it is generated, and the amount of malodorous gas can be continuously and constant.

Various other embodiments are possible, such as a spiral shape in FIG. 4, a box shape in FIG. 5, and a cylindrical shape in FIGS. 6 and 7. The invention does not preclude design changes in its technical concept based on the scope of the claims.

[Brief explanation of the drawing]

1, 2, and 2 show basic specific examples of the present invention. FIG. 4, FIG. 5, FIG. 6, and FIG. 7 show a specific example of the present invention. FIGS. 8 and 9 show specific examples of the bottom surface. FIG. 10 shows a specific example of the current plate. In the figure, 1 is a gas exhaust pipe, 2 is a gas outlet, 4 is a dispersion plate,
5 is a separator plate, 6 is a rectifying plate, 7 is an air inflow/outlet, 8 is a floor surface, 9 is a bottom surface, 10 is a drain discharge pipe, 11 is an outer box, 1
Reference numeral 2 indicates a drain outlet groove 13, a rupture plate, 14 a gas flow path, and 15 a gas flow port.

Claims (1)

[Claims] 1 Temporarily stores gas containing malodorous components that is generated discontinuously and with large flow rate fluctuations, and supplies the gas continuously and quantitatively for use in subsequent processes such as deodorization. In order to do this, the inside of a box-shaped, cylindrical, etc. airtight container is divided using a separator plate to form a series of gas flow paths.
A gas holder whose one end is connected to a gas inlet and outlet and whose other end is open to the atmosphere as an air outlet and inlet, with a separator standing vertically from the bottom. Including gas gas holder