JPH0418675Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to damper-type and non-damper-type electrostatic precipitators (hereinafter referred to as EP), and particularly relates to improvements in rectifying configurations. [Prior Art] Figures 3a to 3c show examples of the configuration of this type of conventional EP, respectively. Figure 3a is a plan view showing the overall configuration of the EP, and Figure 3b is a plan view showing the overall configuration of the EP. Figure 3c shows the perforated plate part in Figure 3b.
FIG. 3 is a diagram showing the detailed configuration of part A'. In Figures 3 a to c, 1 is the inlet duct, 2 is the damper, 3 is the inlet expansion tube, 4 is the side wall of the EP main body, and 5 is the inlet duct.
is a dust collection chamber, 6 is an outlet throttle pipe, 7 is an outlet duct,
8 is a partition wall, 9 is a first perforated plate, 10 is a second and third
Each figure shows a perforated plate (with a flap), constructed as shown. That is, for the flow rectification in the damper type EP, two to three first, second, and third perforated plates 9 and 10 are arranged in the inlet expansion pipe section 3, and the second and third perforated plates 10 are arranged in the expansion direction. Flaps (deflection vanes) are added to improve the outward flow towards the
However, with this method, the flow is non-uniform near the partition wall 8 in the EP (the average flow velocity ratio υi/ is 1.5 to 2 times that near the partition wall 8 compared to other parts).
This tendency is particularly noticeable when the damper is in use (with the damper closed in one chamber and no gas flowing). As a result, the dust collection rate decreases in areas where the flow velocity is high, and the dust collection rate of the flow near the partition wall decreases due to dust scattering. As a result, even if the capacity of EP is increased with the aim of improving EP performance, there will still be areas where dust collection is poor due to local unevenness in the flow velocity distribution, resulting in poor dust collection performance. will reach a plateau, making it impossible to improve the performance of EP. Also damper type EP
This method aims to improve the performance of the EP by completely collecting the re-dispersed dust caused by hammering in the hopper, but due to the problems mentioned above, one step of improvement has been made. The current situation is that this has not been done.
Therefore, in order to solve such problems,
It is necessary to improve the rectification within the EP. [Problems that the invention attempts to solve] By the way, the conventional damper method as described above
The feature of the current plate in EP is that the first current plate 9 is a perforated plate, and the second and third current plate 10 are perforated plates + flaps, respectively, to correct the outward flow in the expanding direction. It is in. However, since the length of the flap is short due to concerns about dust accumulation on the flap, the second and third perforated plates 10
It is not possible to make the flows completely parallel. As a result, flows with vectors concentrate on each partition wall 8, resulting in non-uniform flow in the vicinity of the partition walls 8. Therefore, a method of increasing the length of the flap in order to completely correct the direction of the flow may be considered, but as mentioned above, the accumulation of dust on the flap,
Furthermore, there is a concern that the openings in the perforated plate may be clogged with dust, and increasing the length of the flap may lead to an increase in costs. This invention was developed to solve the above-mentioned problems, and its purpose is to suppress the local fast flow near the EP internal partition wall and reduce the flow within each section, both when the damper is in use and when it is not in use. can be made uniform,
The objective is to provide an inexpensive and highly reliable electrostatic precipitator that can improve dust collection performance throughout the EP. [Means for Solving the Problems] In order to achieve the above object, the present invention expands the gas flow flowing from the inlet duct via the damper into the inlet expansion pipe that leads it to the dust collection chamber. , a plurality of perforated plates for rectifying the gas flow are spaced apart in a direction substantially perpendicular to the inflow direction of the gas flow,
Furthermore, in an electrostatic precipitator configured by partitioning a perforated plate and a dust collection chamber with a partition wall, the joint between the partition wall and the perforated plate, and the joint between the inlet expansion tube side plate and the perforated plate are fixed to the perforated plate side. I try to install resistance plates of different widths. [Function] In the electrostatic precipitator configured as described above, a resistance plate having a certain width in the height direction is installed on the side of the rectifier plate from the joint between the partition wall or the side plate of the precipitator and the rectifier plate. Therefore, the flow along the partition wall inside the expansion tube is blocked by the resistance plate, and the local fast flow near the partition wall is suppressed, making it possible to achieve a uniform flow velocity distribution throughout the partition section. can. [Example] Hereinafter, an example of the present invention shown in the drawings will be described. Figures 1a to 1c show configuration examples of the EP according to the present invention. Figure 1a is a plan view showing the overall configuration of the EP, and Figure 1b is a cross section taken along the line B-B in Figure 1a. A perspective view showing the configuration, Figure 1c is Figure 1b
FIG. 3 is a perspective view showing the detailed configuration of portion D in FIG.
In addition, in FIGS. 1a to 1c, the same parts as in FIGS. 3a to 3c are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be described here. That is, FIGS. 1a to 1c show the joints between the second and third perforated plates 10 and the partition wall 8 disposed inside the EP inlet expansion tube 3 in FIGS. 3a to 3c, and the inlet expansion tube 3. Resistance plates 11 each having a constant width are installed on the side of the perforated plate 10 from the joint between the side plate and the second and third perforated plates 10. In the EP having such a configuration, when the damper 2 is used, the gas flow is uniformly distributed from the inlet duct 1 into the inlet expansion pipe 3 (section) by the damper 2, and is expanded by the first perforated plate 9. distributed in the direction. Here, the flow in the spreading direction is already partially concentrated near the partition wall 8, but the B/W installed in the second and third perforated plates 10 is from 0.017 to
0.1 (B: width dimension of the resistance plate, W: width dimension per section) by the resistance plate 11 (made of steel plate, in contact with the partition plate, width dimension is the same throughout the entire height direction), A fast flow along the partition wall 8 is suppressed. In addition, the flow in the entire area of each section is determined by the second and third perforated plates 1
EP while performing dispersion and direction correction by 0.
The flow is uniform inside. Figure 2 shows a comparison of the flow velocity distribution in the EP inner width direction between the conventional method and this embodiment. The distribution ratio υi/ is shown. In Fig. 2, conventional example (symbol without resistance plate -)
Now, both when the damper is fully open and when the damper is in use.
A particularly convex fast flow velocity distribution is observed near the partition wall 8 of each section within the EP, resulting in an uneven flow. On the other hand, in this embodiment, by installing the resistance plate 11, the locally fast flow near the partition wall 8 is suppressed, and the flow within each section is made uniform, resulting in significant rectification compared to the conventional example. It can be seen that improvements have been made. Note that the δ _g display in the figure indicates the degree of rectification.
Compared to the conventional example, in this example, δ _g =0.2 or less, indicating that a significant improvement in rectification has been achieved. Moreover, the calculation formula for this δ _g (normalized standard deviation) is shown below.

[Effect of idea]

As explained above, according to the present invention, the gas flow flowing from the inlet duct via the damper is expanded in the expansion direction and guided into the dust collection chamber.
In an electrostatic precipitator comprising a plurality of perforated plates for rectifying a gas flow, which are spaced apart from each other in a direction substantially perpendicular to the inflow direction of the gas flow, and further partitioning the perforated plates and the dust collection chamber with a partition wall. , a resistance plate of a constant width is installed on the perforated plate side from the joint between the partition wall and the perforated plate, and the joint between the inlet expansion tube side plate and the perforated plate, so that the damper can be easily An extremely inexpensive and highly reliable product that can suppress local fast flows near the EP partition walls and make the flow uniform within each section, thereby improving dust collection performance throughout the EP. Electrostatic precipitators can be provided.

[Brief explanation of drawings]

Figures 1 a to c show embodiments of the EP according to the present invention. Figure 1 a is a plan view showing the overall configuration of the EP, and Figure 1 b is a cross section taken along line B-B in Figure 1 a. A perspective view showing the configuration, Figure 1c is Figure 1b
Fig. 2 is a diagram showing a comparison of the flow velocity distribution in the width direction inside the EP between the conventional EP and this embodiment, and Fig. 3 a to c show examples of the configuration of the conventional EP, respectively. So, Figure 3a is a plan view showing the overall configuration of EP, Figure 3b is a diagram showing the perforated plate part in Figure 3a, and Figure 3c is a diagram showing the perforated plate part in Figure 3b.
FIG. 3 is a diagram showing the detailed configuration of part A'. 1... Inlet duct, 2... Damper, 3... Inlet expansion pipe, 4... EP main body side wall, 5... Dust collection chamber,
6... Outlet throttle pipe, 7... Outlet duct, 8... Partition wall, 9... First perforated plate, 10... Second and third perforated plate, 11... Resistance plate.

Claims (1)

[Claims for Utility Model Registration] A plurality of perforated plates for rectifying the gas flow are installed inside the inlet expansion pipe that expands the gas flow flowing in from the inlet duct via the damper in the expansion direction and guides it to the dust collection chamber. In an electrostatic precipitator that is arranged at a distance in a direction substantially perpendicular to the inflow direction of a gas flow and further partitions the perforated plate and the dust collection chamber by a partition wall, the partition wall and the perforated plate are joined to each other. An electrostatic precipitator characterized in that a resistance plate having a constant width is installed on the side of the perforated plate from the joint between the inlet expansion tube side plate and the perforated plate.