JPS6233519A - Horizontal flow system waste gas treating apparatus - Google Patents

Abstract

PURPOSE:To efficiently utilize the whole packed bed and to collect dust for a long time by progressively increasing the diameter of the grains of the packing material in the packed chamber toward the dust chamber. CONSTITUTION:The internal space hermetically sealed by a casing 25 is separated by an inlet support wall 23 and an outlet support wall 20 into a dust chamber 22, a packed chamber 24 and a dust collecting chamber 30 and waste gas C is allowed to flow into the dust chamber 22 in the direction as shown by the arrow. The inclination of the slant surface 35 of the upper chute 31 of the packed chamber is made larger than the angle of repose of a packing material 35 and the same angle is applied to the slant surface 34 of the lower chute 32. The packing material is classified by the slant surface and hence the diameter of the grains of the packing material is progressively increased toward the inflow side of the waste gas C, namely, a diameter of small, middle and large. Accordingly, the whole packed bed can be utilized, dust can be collected for a long time with a small amt. of the packing material, the moving velocity of the packing material can be increased or decreased when the packing material is circulated and used and the resplashing of the collected dust can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a treatment device for waste gas generated in the operation process of heating, drying, and combustion, and the present invention relates to a treatment device for waste gas generated in the operation process of heating, drying, and combustion. Regarding dry processing to capture.

[Conventional technology]

Dry waste gas treatment equipment includes bag filters, cyclones, electrostatic precipitators, and air tumblers.
A device for collecting dust using a pebble layer is disclosed in Japanese Patent Publication No. 42-4637. In this disclosure, a downward pebble is caused to flow down from above a pair of shutter spaces, and the waste gas is passed through perpendicularly to the flowing pebble to collect dust.

Similar to the above disclosure for capturing suspended solids in water to obtain clear water other than waste gas, U.S. Pat. No. 1,234,114
Japanese Patent Publication No. 59-46649 and Utility Model Publication No. 60-1773 disclosed by the present applicant.

Fluids such as waste gas and water contain various fine solid particles in addition to pure air and pure water, and the methods described above are available for collecting and separating these particles. When a container is filled with pebbles, i.e., solid particles, etc., and waste gas in the fluid is introduced so as to pass through the gaps between the particles, fine particles (hereinafter referred to as ``to'') are introduced into the gaps. A phenomenon of stagnation and capture occurs.

The particle size distribution of dust varies depending on the quality of the waste gas, and it takes the form of a mist. Trapped in small cavities. Dust per unit amount of waste gas is a mixture of large, medium and small diameters, and simply passing it through the pebble layer will reduce the capture efficiency. That is, the closer to the side where the waste gas is supplied, the more dust is captured, and the voids formed by the pebbles at this location become filled with dust and become clogged.

Capturing large dust particles in large voids and passing small dust particles through hollow voids further formed in the large dust trapping layer and capturing them in small voids leads to an increase in trapping efficiency. However, if large and small voids are filled with dust due to continuous trapping for a long time, it will no longer be trapped, so it is necessary to form new voids.This problem can be solved to some extent by making the pebble flow as disclosed above. do. Special Public Service 1977-1977
No. 37 had the drawback that although it formed a pebble-packed layer, the particle size distribution of the pebbles with respect to the layer thickness was not aligned in terms of large, medium, and small, resulting in low trapping efficiency.

The present invention is about dust collection of waste gas, but if waste gas is considered as a fluid, water can also be considered as the same fluid, and a packed bed is formed by arranging fillers such as pebbles, powder, sand, etc. in large, medium and small sizes. This category includes the above-mentioned publications disclosed by the applicant.

Assuming that the grain size of the sand that is the filler is large, medium, and small, if it is allowed to fall naturally from above, it will continue to accumulate on the lower surface of the falling point and form a stable angle of repose. As sand rolls on the slope, small-diameter sand is deposited closer to the upper region of the slope, and larger-diameter sand is deposited farther from the upper region of the slope. Tokuko Sho 59-466, which was created by applying this principle
No. 49 and the like were water treatment devices and could not be directly applied to waste gas. The present invention has been achieved by taking the above-mentioned prior art into account.

[Problem that the invention seeks to solve]

In order to collect dust in high-concentration gases, small-capacity filling materials or catalyst materials are used to withstand long processing times, and in addition, during waste gas treatment operations, it is necessary to easily replace the filling material and ensure reliable separation of the collected dust. This is essential.

However, conventional methods do not satisfy these requirements and cannot be said to have good dust collection efficiency.

An object of the present invention is to provide an apparatus for waste gas treatment that improves dust collection efficiency.

[Means for solving problems]

A dust chamber, a filling chamber, and a gas collecting chamber are arranged side by side in the horizontal direction, and waste gas is supplied to the dust chamber. First, relatively large dust particles in the waste gas are collected and discharged.

The waste gas containing some dust is then passed across the filling chamber and collected as clean gas in a gas collection chamber for discharge. The filling chamber is filled with a filler, and the supporting wall constituting the chamber is made of porous cloth, plate, or par to allow ventilation.

The upper surface of the filler always has an angle of repose formed by upward natural fall, and the closer to the dust chamber side, the larger the particle size of the filler is distributed, so that the filler flows downward.

In this way, large dust, medium dust, and small dust are captured in sequence, and as the cross-layer plane of the packing descends, a new cross-layer plane is created by introducing the newly configured packing from above. It is formed.

〔Example〕

The following will explain based on FIGS. 1 to 5.

An inlet support wall 23 and an outlet support wall 20 are provided to separate the internal space sealed by the casing 25 into a dust chamber 22, a filling chamber 24, and a gas collection chamber 30.
The gas collection chamber 3o is provided with an outlet 26.

The space of the filling chamber 24 penetrates the upper and lower parts of the casing 25,
An upper chute 31 is provided at the top of the space to provide an input port 28. A lower chute 32 is provided at the bottom of the filling chamber 24, and a discharge port 29 is provided at the lowest part.

The slope 33 of the upper chute 31 is formed at an angle equal to or greater than the repose angle of the filler 350, and the slope 34 of the lower chute 32 is also formed at a similar angle.

The support wall 23 may be made of a wire mesh, cloth, porous plate, etc. having a large number of holes 23', or may have a substantially triangular cross-section or a circular shape with an eaves provided around the holes 23' so that the filler 35 does not flow backwards. It is also possible to form slits in which cross-sectional pars are arranged in parallel at intervals smaller than the diameter of the filler 35. The meaning of the present invention can be achieved by the above alone or in combination.

The same is true for the outlet support wall 20, but since the filling material 35 with a smaller diameter is held near the outlet support wall 20, the distance between minute holes or holes is made smaller. In particular, the support walls 20, 23 are important components, and one method is to provide them with a heavy or heavier cloth, porous plate, etc., either fixedly or movably separated or slid into contact with each other. Convenient car to change the support wall itself after driving) IJ
It is also good to make it into a wedge.

The several methods described above have a substantially solid shape, and are expected to prevent the filling material 35 from passing through due to the determined spacing and pore diameter, but shape memory where the spacing widens and narrows due to changes in temperature and pressure. The object of the present invention can also be achieved by using an alloy or resin/rubber type.

A wind direction plate or vibrator (circuit) using waste gas C to transmit vibration to the casing 25 or the inlet/outlet support wall 20.23
may be provided, and these are selected appropriately.

The dust chamber 22 is provided with an inlet for the waste gas C on the side, a hole 437 for collecting relatively large dust 36 in the waste gas C is provided below, and a discharge port 29 is provided at the bottom.

The gas collecting chamber 30 is provided so as to be ventilated with the filling chamber 24, but the rest is sealed and an outlet 26 is provided in only a portion thereof.

The outer shell constituting the dust chamber 22, the filling chamber, and the gas collecting chamber 30 is made into a flat plate or a curved plate depending on the eddy current and shear force caused by internal and external frictional resistance generated by air currents and the flow of solid particles. Depending on the quality and temperature, linings and coatings are applied.

Fig. 4 shows fillers 35 for the inflow and outflow sides of waste gas C.
The ratio of small diameter to large diameter is shown by x, y, and z curves. The filling material 35 is determined depending on the quality and quantity of the waste gas 35, and the particle size is distributed as large, medium, and small from the side closer to the inflow side.

FIG. 5 shows an example of a system for operating the device (main body 40) of the present invention. The waste gas C is passed through the main body 40 in the direction of the arrow C1 and released into the atmosphere as a clean gas C2. On the other hand, Prowa 4
At step 1, air 42 is supplied to the solid-gas mixer 43, and the main body 40
It is mixed with the filling material 35 discharged from the inside, and is sent under pressure to a solid-gas separator 45 through a pipe line 44 to separate air 46. C
The dust 36 inside is separated.

〔Effect of the invention〕

As described above, according to the present invention, the filling material is filled into the support rod by slanting the filling material, and by effectively utilizing the entire filling layer, the filling material can be filled for a long time with a small amount of filling. In addition to making it possible to collect dust, the moving speed of the filling material can be increased or decreased when the filling material is recycled, reducing the amount of trapped dust that is scattered again, and preventing secondary pollution.

[Brief explanation of drawings]

FIG. 1 shows an elevational cross-section of the present invention, and FIG. 2 shows the arrow A--A in FIG. Fig. 3 is a detailed diagram showing the filling state in Fig. 2, Fig. 4 is a schematic diagram showing the distribution of small and large diameters of the filling material with respect to the inflow and outflow sides of waste gas, and Fig. 5 is a detailed view showing the filling state of Fig. 2.
FIG. 4 is a flowchart diagram showing a system using the main body 40). 20: Exit support wall, 21: Entrance, 22: Dust chamber, 23:
Inlet support wall, 24: Filling chamber, 26: Outlet, 28: Inlet, 29: Outlet, 30: Gas collection chamber, 31: Upper chute,
32: Lower chute, 40: Main body, C: Waste gas, C1: Secondary waste gas, (::,: Clean gas. 20'... Hole 30... Gas collection chamber 31... Upper sheet 32.・Bottom sheet 2nd Figure 33・
...Slope Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A dust chamber, a filling chamber, and a gas collection chamber are arranged side by side in the horizontal direction,
In waste gas treatment equipment that holds the filling material so that the diameter of the filling chamber becomes larger as it approaches the dust chamber, an upper chute with an angle greater than the repose angle of the filling material is provided at the top of the filling chamber, and the sides of the filling chamber are wide. A horizontal flow waste gas treatment device characterized by having a plate-like body having holes or slits. 2. An inlet, an upper chute, a filling chamber, a lower chute, and an outlet are provided from above so that the filling material can flow downward from above, and only a filling chamber, a dust chamber, a filling chamber, and a gas collecting chamber are provided. A horizontal flow waste gas treatment device characterized in that it allows ventilation.