JPS59209665A - Pressure relief apparatus of electric dust collector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a device for protecting the casing of a box-shaped electrostatic precipitator from damage due to pressure shock, the device being provided in the sealed ceiling of the electrostatic precipitator. with a pressure relief m10 and a circular cover closing this pressure relief opening in a gas-tight manner, which cover is designed to withstand negative pressures in the casing up to 2000+ m water column and operating temperatures up to 350°C. At the same time, the overpressure exceeding atmospheric pressure is 50 mm of water column, but the pressure relief opening is sealed at approximately 25 mm of water column pressure exceeding atmospheric pressure. The present invention relates to a pressure relief device for an electrostatic precipitator, which is configured to completely open the part of the electrostatic precipitator.

The casing of the conventional electric dust generator is subject to deflagration or explosion phenomena.
) Various measures have already been proposed to protect against damage caused by pressure shocks. Generally, electrostatic precipitators can be divided into three different application areas:

(a) Areas where deflagration or explosion must be expected under normal operating conditions, based on the composition of the gas or the nature of the dust to be separated. For example, a precipitator located behind a steelmaking converter or a minute gas plant.

(b) Areas where there is no possibility of deflagration or explosion under normal operating conditions, but where this cannot be completely avoided in the event of operational failure. For example, a precipitator in a waste gas purification plant located behind a heat exchanger furnace or behind a lorry kiln in a cement factory.

(C) Fields where there is no possibility of in-process combustion or explosion occurring under any circumstances. For example, stone) Δ
Dust collectors located behind the grinding and drying plant, as well as behind the steam boiler.

By the way, the present invention belongs to the above scope of application (a).

Pressure relief devices in this field must be constructed such that after the pressure relief opening has been opened due to deflagration or explosion, the casing must be made gas-tight again in order to avoid interruptions in operation for repair work. Must be automatically closed.

From DE 2009853 A1, an explosion safety cover for pressure relief openings in containers, pipelines and the like is known.

In this explosion safety cover, a ring-shaped support member is fixed to a flange around the pressure relief opening, and a plurality of buffer members are provided at intervals around the ring-shaped support member. . These loose members are intended to dampen the upward movement of the explosion safety cover, and have different damping characteristics and respond in stages to the elevation of the explosion safety cover when it is lifted. Soshi-(t
At least one damping member is fixedly attached to the full cover of the '11ζ generator, by means of which a minimum response pressure is determined.

The problem to be solved by the invention is that this type of explosion safety cover has a very high cost and high structure, and that the cover may become unresponsive over time, or the function of the spring member and guide portion may deteriorate. It is evident that the cushioning properties of the cover will change if it is compromised by corrosion or dirt build-up. There is also the disadvantage that the minimum response pressure required to respond to this is determined not only by the weight of the cover, but also by the initial stress of the spring member that responds first. As this response pressure increases, the strength of the dust collector casing must be increased, which also increases costs.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pressure relief device that satisfies all of the above-mentioned conditions, has low production costs, is easy to assemble, and can be easily replaced when necessary. be.

Means for Solving the Problems In order to achieve the above object, the present invention comprises a cover consisting of a shell-shaped upper structure part and a shell-shaped lower structure part having a slightly smaller diameter, and this upper structure part and the lower part The structural parts are connected to each other via a ring-shaped annular member, and this annular member is placed on the edge of the pressure relief opening.

An insulating member may be disposed between the upper structure portion and the lower structure portion within the cover. Further, the upper structure portion and the lower structure portion may each be constructed from a thin plate member formed in a conical shape, and may be connected to each other by the annular member. A guide rod with a stop at the top is arranged at the edge of the pressure relief opening.

Further, according to the present invention, the guide member and the buffer on the cover are J, i.
It is possible to provide a double cover, and
Advantageously, at the edge of the pressure relief opening, it rests on the insulating element via the double substructure part and on the sealing ring via the annular element.

Function: By configuring as described above, the structure of the cover can be made extremely lightweight, so that it is possible to realize a low response pressure while not satisfying the required temperature and strength conditions. The overall design of the electrostatic precipitator casing can therefore be based on relatively low pressure peaks and can be correspondingly relatively lightweight.

The inclusion of thermally insulating material also avoids heat transfer that could promote corrosion. The device is manufactured as a prefabricated unit and can be installed at low cost. This cover maintenance and airtightness monitoring can be done from the outside, so there is no need to interrupt operation for this purpose.

Note that the bearing force at the seal portion is set so that sufficient gas tightness can be guaranteed within the above-mentioned pressure range only by the cover's own weight. The above requirements are then guaranteed even if the cover is repeatedly raised and lowered from its rest due to deflagration or explosion within the electrostatic precipitator. Furthermore, despite its lightweight construction, the cover exhibits self-stability and self-shape constancy to withstand the designed negative pressure loads without unacceptable elastic deformation or residual deformation. have.

Example Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, the circular pressure horn relief opening 2 has a double surrounding wall in which an insulating member is inserted. The upper end of this double wall is closed by a ring-shaped thin plate part, on which an elastic ring-shaped insulating material 16 is arranged. In order to limit the upward movement of the cover 1, four guide rods 12 having stoppers 13 at the upper part are arranged at equal intervals around the cover 1.
This is a buffer Lf to avoid excessive waiting thrust penetration.
15 force is provided and this buffer spring 156 is placed on the guide member 14 fixed to the bracket X-+). J bar 1 is formed from the conical V"J plate part 8,9 to the shape I
It consists of a partial structural part 3 and a lower structural part 4, which are welded to each other 1 via a ring-shaped annular member 5. The cover 1 is then rested by this annular member 5 on the edge 6''-G of the pressure relief opening 2, on which edge 6 a seal 1 non-circuit 17 is provided. Also, the upper structure part 3 and -F joint μm 4
An insulating material 7 is disposed between the construction part 4 and the insulating material 7.

FIG. 3 Q shows a second fruit 7jin for the conical -L portion 1 and N-shaped portion 3 and lower structure portion 4 in FIG.
(911 is shown. In the case of this second example, υ
The partial structural part 3 and the substructural part 4 are composed of dish-shaped brakes 1-10.11. WS 1 in Figure 1
When compared with the embodiment, the only other difference is the shape of the annular member 5. All other components are the same, so those with the same or identical functions are given the same reference numerals and their explanations will be omitted.

To briefly describe the gist of the present invention while illustrating the embodiments already described, the present invention is to prevent damage to the casing 1 of a box-type electrostatic precipitator from pressure shock caused by deflagration or explosion phenomena inside the precipitator. To protect against this, pressure relief devices have been proposed.

This pressure relief device is designed to withstand internal casing negative pressures of up to 2000 m of water and operating temperatures of up to 350°C, while its own weight effectively seals up to overpressures of approximately 50 m of water above atmospheric pressure. However, it is also configured to fully open the pressure relief opening at pressures of approximately 250 dragons of water above atmospheric pressure. The cover 1 consists of a shell-shaped upper structure part 3 and a shell-shaped lower structure part 4. These side structural parts 3.4 are connected to each other via a ring-shaped annular element 5, which rests on the edge 6 of the pressure relief opening 2.

As described in detail, according to the present invention, the cover can be made extremely lightweight, so it is possible to achieve low response pressure while not satisfying the required temperature and strength conditions. . The overall casing of this electrostatic precipitator can therefore be based on - relatively low pressure peaks and correspondingly be relatively lightweight. Additionally, this device is manufactured as a prefabricated unit and can be assembled at a low cost. Maintenance of the cover and monitoring of airtightness can be carried out from the outside, so there is no need to interrupt operation for this purpose.

Note that the bearing force at the seal portion is set so that sufficient gas tightness is guaranteed within the above-mentioned pressure range only by the cover's own weight. The above requirements are guaranteed even if the cover is repeatedly raised and lowered from its rest due to deflagration or explosion in the electrostatic precipitator.

Furthermore, despite the lightweight construction of this cover,
It has self-stability and self-shape constancy such that it can withstand negative pressure loads on the decking without unacceptable elastic deformation or residual deformation.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the invention, FIG. 1 is a longitudinal sectional view of the pressure relief opening with a cover attached, FIG. 2 is a plan view of the cover, FIG. 3 is a longitudinal sectional view similar to FIG. 1 showing a second embodiment of the invention. In addition, in the symbols used in the drawings, 1------------1--2--2-------1--Pressure relief opening 3- ---
−−−−−・−−1−− Upper structure part 4−−−−−−
---------One lower structure part 5-----
-----Ring rod member 6------------One edge. Agent Saturn Katsutsunekane Yoshio

Claims (1)

[Scope of Claims] ■ A device for protecting the casing of a water box type electrostatic precipitator from damage caused by pressure shock, which is a device for protecting the casing of a water box type electrostatic precipitator from damage caused by pressure shock, which Part (2
) and a circular cover (1) closing this pressure relief opening (2) in a gas-tight manner, said cover (1)
The negative pressure inside the casing up to 2000mm water column and 3
It is constructed to withstand operating temperatures of up to 50°C and is effectively sealed by its own weight to overpressures of approximately 50°C above atmospheric pressure; Now, the above pressure relief opening (2)
In a pressure relief device for an electrostatic precipitator that is configured to completely open the air, the cover (1) has a shell-shaped upper structure part (3) and a shell-shaped lower structure part (3) with a slightly smaller diameter. 4), which are connected to each other via a spring-shaped annular member (5) to the upper structure part (3) and the lower structure part (4), and this annular member (5) is connected to the pressure relief opening. Part (2) Silk, Part (6)
A pressure relief device for an electrostatic precipitator, characterized in that the pressure relief device is placed on top of the electrostatic precipitator. 2. The above-mentioned upper structure part in the cover (1) (
3) and the lower structure part (4).
7). The device according to claim 1, wherein: 3.''-Elevator structure part (3) and said lower structure part (4)
) are thin plate shrines (8) and (9) each formed in a conical shape.
) and are connected to each other via the annular portion +A (5). 4. The above upper structure part (3) and the above lower structure part (4)
3. Device according to claim 1, characterized in that they each consist of dish-shaped plates (10) and (11), which are connected to one another via said annular member (5). 5. A guide rod (12) with a stopper (13) at the top thereof is arranged at the edge (6) of the pressure relief opening (2). Apparatus according to any of paragraph 4. 6. The cover (1) has a guide portion tA' (14) and a buffer spring (15), according to any one of claims 1 to 5. Device. 7. The cover (1) has the pressure relief opening (2
) is placed on the insulating material (16) via the lower structural part (3) and on the sealing ring (17) via the annular portion (5), respectively. An apparatus according to any one of claims 1 to 6, characterized in that: