JPS601046B2 - Flue gas desulfurization equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flue gas desulfurization system, and more particularly to a lining structure for lining a dust tower or the like of a flue gas desulfurization system.

Conventionally, in heavy oil-fired boiler exhaust gas desulfurization equipment using the dust mixing method (also called the soot mixing method), limestone, sulfite stone, and gypsum are contained in the circulating slurry liquid, and chlorine ions and fluoride ions are mostly contained in the slurry. As shown in Figs. 1 and 2, the inner wall of the throw section of the dust removal tower (referred to as a cooling tower in the case of heavy oil burning) is equipped with a discontinuous mounting bracket 7A (with an L-shaped cross section). SU
Silica (Si02)-based bricks 6A were attached to S314), and the gaps between the bricks were further filled with Si02-based joint material 9A.

In this case, the vessel wall 11 is covered with a membrane lining 8, but the lining 8 is not applied to the mounting fitting 7A since even a metal of SUS31& grade has sufficient corrosion resistance. On the other hand, exhaust gas desulfurization equipment attached to coal-fired boilers and desulphurizing furnaces handles more dust than heavy oil-fired boilers, so a dust separation method (also known as a soot separation method) is adopted. Often. For this reason, the circulating fluid in the dust removal tower of the desulfurization equipment contains a large amount of dust, chlorine ions, and fluorine ions, and the inexpensive SO2 bricks and joint materials mentioned above cannot be used because they do not have corrosion resistance, and are expensive. It is necessary to use SIC type or A-203 type bricks and joint material. In addition, from a structural standpoint, it is necessary to cover the mounting brackets with mesofrene lining, but with discontinuous mounting brackets provided for each brick as shown in Figure 1, it is difficult to install membrane lining, and there is insufficient It was not possible to expect good corrosion protection. FIG. 2 is a cross-sectional view showing the lining structure of the vessel wall 11. The construction of the lining on the vessel wall 11 involves joining the discontinuous mounting bracket 7A to the vessel wall 11 by welding, and then attaching the membrane lining 8. Although it is lined, there are many discontinuous mounting brackets 7A scattered around, so
In order to easily install the membrane lining 8, the discontinuous fittings 7A are hollowed out at the positions of the discontinuous fittings 7A, and the discontinuous fittings 7A are made to protrude from the surface of the membrane lining 8 as shown in FIG. Material 9A, brick 6A
I lined it with lining. However, in order to protrude the discontinuous mounting bracket 7A, the membrane lining 8 is cut out (or a cut is made).
Therefore, the membrane lining 8 itself becomes discontinuous at the position of the fitting 7A, and this discontinuous membrane lining 8 develops into corrosion of the fitting 7A and the vessel wall 11 due to penetration of circulating fluid, etc. On the other hand, even if the brick 6A is a highly corrosion-resistant SIC or A-203 brick, and the joint material 9A is used, the brick 6A and the joint material 9A are wear resistant, but
Since these bricks 6A themselves are porous, circulating fluid containing chlorine ions and fluoride ions penetrates into the bricks 6A, and this penetrating circulating fluid flows through the mounting bracket 7A and the discontinuous membrane lining 8 to the vessel wall. 11 had the disadvantage of corroding.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to facilitate the construction of a membrane lining and to prevent the permeation of circulating fluid of a desulfurization device by lining with a continuous membrane lining.

The present invention provides a long strip-shaped mounting bracket in a place that requires corrosion resistance and wear resistance, such as the throat section of a dust removal tower of a coal-fired flue gas desulfurization equipment, and uses a continuous membrane lining to secure the mounting bracket. The surrounding area is lined with lining.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

FIG. 3 is a partially cutaway view showing a dust removal tower and an absorption tower of a flue gas desulfurization apparatus to which the brick structure of the present invention is applied.

As shown by the arrow, the exhaust gas first enters the dust removal tower 1, where it is cooled and dust removed by the circulating liquid that is atomized from the spray nozzle 5, passes through the throw section 4, the mist is removed by the eliminator 3, and then is absorbed. Enter tower 2. The throw section 4 of the dust removal tower is provided with anticorrosion membrane lining and brick lining (a combination of brick blocks and joint material) in consideration of hydrofluoric acid resistance and abrasion resistance. FIG. 4 is a sectional view of the inner wall of the throw section 4, and FIG. 5 is a perspective view showing how the mounting bracket 7 of FIG. 4 is attached.

In the figure, mounting brackets 7 made of continuous pieces having an L-shaped cross section are attached to a container wall 11 horizontally and in multiple stages above and below. As shown in FIG. 5, since the mounting brackets 7 are continuous, the lengths of the outer circumferences of the mounting brackets 7 are the same, and for this reason, the membrane lining 8 is As shown in Figure 4, a continuous membrane lining 8 becomes pleated around the outer periphery of the mounting bracket 7, but its length is the same at any location, so
A wide membrane lining 8 can be uniformly and easily applied. As a result, the membrane lining 8 is applied continuously from the vessel wall 11 to the entire surface of the crest fitting 7. The brick block 6 that is engaged with the mounting bracket 7 is made of highly corrosion-resistant S°C or A203 series brick, and the joint material 9
It is also of the SIC or A〆203 series. Furthermore, in order to reduce the amount of joint material 9 or brick 6 used, a corrosion-resistant solid material 10 is inserted into a part of them (in this case, a part of the original material under mounting bracket 7). As the solid 10, an inorganic material (including bricks and other refractories) that is cheaper than the surrounding joint material and bricks and has corrosion resistance is used. According to the above embodiment, by using the continuous mounting bracket 7 and the continuous wide membrane lining 8, there is no cut in the lining, and therefore corrosive liquid or gas can penetrate through the cut in the mounting bracket. This eliminates corrosion and makes lining construction easier and increases its reliability.

As described above, according to the present invention, in brick lining construction where fluorine acid resistance is a problem, such as in dust removal towers of exhaust gas desulfurization equipment of coal-fired boilers, the mounting bracket and membrane lining can be changed from the conventional discontinuous type to the continuous type. By doing so, there is no cut in the lining of the mounting bracket, making construction easier and significantly increasing the reliability of the lining.

In addition, since the mounting bracket is surrounded by a membrane lining, it does not necessarily have to be made of a corrosion-resistant material, and can be manufactured at low cost, and since dissimilar materials are not welded together, welding work can be saved. These greatly contribute to the economic efficiency of desulfurization equipment as an environmental measure against the increase in the number of coal-fired boilers due to oil shortages in recent years.

[Brief explanation of drawings]

Fig. 1 is a cutaway perspective view showing how a conventional brick mounting bracket is installed in the throw section of the flue gas desulfurization equipment; Fig. 2 is a sectional view of the inner wall of the throw slot of the flue gas desulfurization equipment in Fig. The figure is a cutaway view of the vicinity of the throw part of a flue gas desulfurization equipment using the dust separation method, FIG. 4 is a cross-sectional view showing the lining structure of the throw part showing an embodiment of the present invention, and FIG. FIG. 3 is a cutaway perspective view showing the mounting state of the mounting fittings in the embodiment. 1... Dust removal tower, 4... Throw section, 6, 6A... Brick block, 7, 7A... Mounting bracket, 8... Membrane lining, 9, 9A... Joint material, 10... Insertion Solid, 11... vessel wall. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Attach the brick to the inner wall of the desulfurization equipment via the mounting bracket,
A flue gas desulfurization device in which the gaps between the bricks are filled with a joint material, characterized in that the mounting bracket is formed of a continuous long piece, and the periphery of the mounting bracket is lined with a continuous membrane lining. .