JP2686265B2 - Desulfurization equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a desulfurization device, and more particularly to a desulfurization device having a support structure such as a multistage spray nozzle pipe of a spray type desulfurization tower.

[Conventional technology]

FIG. 4 shows a conventional limestone-gypsum method wet flue gas desulfurization apparatus for removing sulfur oxides contained in exhaust gas from a boiler, in which cooling, dust removal and absorption of exhaust gas are continuously performed in one tower. FIG. 1 is a schematic view of a one-column spray desulfurization tower according to the present invention.

This device consists of a coolant spray pipe 2, a gas dispersion plate 3,
It comprises a spray type desulfurization tower 8 having a multi-stage absorption liquid spray pipe 4 and a demister 5, and a circulation pump 7 for circulating the absorption liquid and the cooling liquid through the respective pipes.
In FIG. 4, the untreated gas is introduced into the spray type desulfurization tower 8 through the gas inlet 1 and cooled and dedusted by the limestone slurry liquid sprayed from the spray nozzle 9 installed in the cooling liquid spray pipe 2. After that, the untreated gas is countercurrently contacted with the limestone slurry liquid from the gas dispersion plate 3 or the limestone slurry liquid on the gas dispersion plate 3, the gas flow velocity is rectified almost uniformly, and part of the sulfur oxides is removed. It Next, a spray nozzle 9 installed in the upper multi-stage absorbent spray line 4
The sulfur oxide in the untreated gas is absorbed and removed by making a gas-liquid contact with the limestone slurry liquid sprayed from in a counterflow. This limestone slurry liquid is sprayed with a spray nozzle 9 by a circulation pump 7.
Returned to and used repeatedly. Furthermore, after the scattered mist from the absorption section is removed by the demister 5 installed at the top of the tower, the processing gas is discharged from the gas outlet 6 to the outside of the system through a chimney (not shown).

The multi-stage absorbent spray pipe 4 is usually constructed in 2 to 6 stages depending on the concentration of sulfur oxides in the exhaust gas and the required desulfurization rate. The absorption liquid spray pipe of FIG. 4 is an example of four stages.

The internal structures of the cooling liquid spray pipe 2, the gas dispersion plate 3, the absorbing liquid spray pipe 4 and the demister 5 provided in the spray type desulfurization tower 8 are individually installed supports.
Supported by 10, 11, 12 and 13, respectively, these supports are connected to the desulfurization tower sidewalls via crossbeams 20 (see FIG. 9).

These supports 10, 11, 12 and 13 increase the cross-section blockage rate of the spray desulfurization tower 8 and impair the spray performance. Therefore, the flange width B of the support beam shown in FIG. The width is set to a minimum necessary for supporting, and the height of the support beam is set to a height at which the slurry liquid sprayed from each spray nozzle 9 in the same stage does not collide.
Furthermore, the flange thickness tf and the web thickness tw must be set so that the strength can be satisfied while considering the economical efficiency.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technology, the size of the spray desulfurization tower is increased with the increase in capacity of the boiler (for example, the tower diameter is 20 m).
There are no design considerations regarding the support structure for internal structures in. That is, if the spray-type desulfurization tower 8 becomes larger, the size of each internal support (10, 11, 12, and 13) for supporting the internal structure increases, and (a) the cross-section closing rate increases. Increase in draft (pressure loss) due to (b) increase in scaling area for support due to increase in size of internal supports, (c) spray from the spray nozzle 9 at each stage, which is the heart of the spray desulfurization tower 8. There is a problem that the spray pattern of the limestone slurry liquid is obstructed, and (d) the cost of the utility is increased due to the increase of the draft due to the influence of the internal structure and the internal support.

In the conventional pipe support structure as described above, since the internal supports are increased in size when the tower diameter is increased, the limestone slurry liquid sprayed from the spray nozzle 9 is prevented from colliding with the support of the same stage. Figure and No. 9
As shown in the figure, it is necessary to provide the branch pipe 15 with a vertical portion. This is because, when the sprayed droplets collide with the support of the same stage, the droplets do not reach the area sufficiently, so that a short pass area of the exhaust gas occurs and the desulfurization rate decreases. However, even in the case of such a structure, the distance that the droplet collides with the lower pipe is shortened as much as the spray position of the spray nozzle is dropped downward, and the contact time between the droplet and the gas is locally reduced. The overall desulfurization performance will decrease.

In addition, as the size of each internal support increases, their weight naturally increases, and the weight of each block when the desulfurization tower 8 is divided vertically is increased at the time of factory production or on-site installation. Due to the capacity of the heavy equipment (recker), large blocks cannot be implemented, and there are cases in which the support or the like of each block must be partially removed in order to put it within the limited weight.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, reduce the cross-sectional blockage rate and the scaling area for the support accompanying the increase in size of the desulfurization tower, and improve desulfurization performance and economic efficiency. It is to provide a desulfurization device having a support structure.

[Means for solving the problem]

The present invention provides a plurality of large support trusses having a plurality of large trusses in which upper and lower adjacent supports are connected by braces in an absorption tower for contacting a gas to be treated with an absorbing liquid and removing sulfur oxides in the gas. The invention relates to a desulfurization apparatus having a structure in which an absorption liquid spray pipe is installed on the support beam and the absorption liquid is sprayed into the absorption tower through a branch pipe branched from the pipe. Further, in the present invention, it is preferable that a large number of large-scale trusses are provided in the vertical direction in the absorption tower, and the large-scale trusses of the respective stages are arranged orthogonal to each other.

[Action]

Even if the desulfurization tower becomes large, for example, with a tower diameter of 20 m, a spray-type desulfurization tower having, for example, four-stage absorption liquid spray pipes by connecting the pipe supports adjacent to the upper and lower stages with braces to form a large truss. Now, by connecting two stages of piping with braces to the absorbent spray zone, which is the heart of it, and forming a large truss, the rigidity of the absorbent spray piping support is several to several tens of times that of the conventional type. It is possible to double the size of the absorbing solution spray pipe, and the size of the absorbing liquid spray pipe support itself can be reduced.

By forming such a large truss, the height H of the support (see FIG. 5) can be lowered, and even in a large-capacity spray desulfurization tower, the branch pipe 15 of the spray nozzle 9 of the absorbent spray pipe can be used. Does not need to have a vertical portion, and can be a simple spray nozzle 9 as shown in FIGS. 6 and 7. Therefore, the cross-sectional blockage rate and the scaling area can be reduced, and the support weight can be reduced, so that the spray-type desulfurization tower can be excellent in desulfurization performance and economical efficiency.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 is a schematic view of a one-column spray desulfurization tower showing an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. In the figure,
The difference from FIG. 4 is that the supports 10, 11, 12 and 13 vertically adjacent to each other in the absorption tower 8 are connected by braces 14 to form a large truss 21. That is, the cooling liquid spray pipe 2 and the supports 10 and 11 for the gas dispersion plate 3
Between the absorbent spray pipes 4a, 4b, 4c, 4d supports 12a and 1
Support 2b, 12c and 12d, and demister 5a, 5b 13
Braces 14c, 14a, 14b and 14d are connected between a and 13b, respectively.

2A and 2B (II A-II A and II B in FIG. 1)
-II B arrow sectional view), the absorbent spray pipe 4 provided with the spray nozzle 9 is supported by the absorbent spray pipe support 12 and the beam 20, and the absorbent spray pipe support 12 is , Figure 2C (Figures 2A and 2B)
As shown in the sectional view taken along the line II C-II C in the figure), the large-scale truss 21 is formed by connecting the absorbing solution spray pipe support 12 and the brace 14 in the lower stage.

FIG. 3 is a perspective view of the large truss of the absorption section of FIG. In the figure, the uppermost (first) absorption liquid spray piping support 12a and the second absorption liquid spray piping support 1
2b is connected by the brace 14a for the 1st step and the 2nd step to form a large upper truss 21.
The upper truss 20a and the lower truss 20b connect between (B) or between the large truss 21 and the side wall (not shown) of the spray desulfurization tower 8 to form a rigid support structure. Upper beam 22a
Is the uppermost absorbent spray pipe 4a, and the lower beam 20
b supports the second-stage absorption liquid spray pipe 4b.

Similarly, the third and fourth stage absorbent spray pipes 4c, 4d are similarly connected by braces 14b to form a large truss 21, and are provided with a rigid support structure connected to the upper and lower beam members 20c, 20d. Supported.

These large truss structures can be formed not only on the supports such as the cooling liquid spray pipe, the gas dispersion plate, the absorbing liquid spray pipe, and the demister described above, but also on other supports such as the demister cleaning pipe.

The desulfurization apparatus of the present invention is not limited to the truss structure described above, and if it is possible to make a larger block depending on the conditions such as manufacturing in the factory, transportation, and installation at the site, it is possible to use two or more stages. It can also be a paired structure,
As another supporting method, for example, a cross truss structure may be adopted.

Further, the present invention is not limited by the cross-sectional shape of the desulfurization tower, the type of spray nozzle, the structure of the spray pipe, and the like.

FIG. 10A and FIG. 10B are diagrams showing left and right half blocks in a perspective view taken along the line II A-II A in FIG. These half blocks 22 have a structure in which a large truss 21 is arranged in the block and the large truss 21 is connected to the desulfurization tower side wall 23 by the upper beam 20a and the lower beam 20b to have rigidity. As in the conventional case, it is not necessary to bend the side wall of the desulfurization tower 8 to provide a employment for preventing deformation during transportation and transportation, thus saving the labor and time for construction.

FIG. 11 is a block diagram of a desulfurization apparatus showing another embodiment of the present invention. This device is a spray desulfurization tower in which a cooling tower 16 which is a gas cooling and dust removing section and an absorption tower 17 are separated, and the installation area is larger than that of the single tower spray desulfurization tower. 17 absorption liquid spray pipes 4a, 4b, 4c,
By connecting the absorption liquid spray piping support 12a and 12b, 12c and 12d and the demister support 13a and 13b of the internal structure of the 4d and the demister 5a, 5b with the braces 14a, 14b and 14d, respectively, to form the large truss 21. The same effect as the one-column spray desulfurization tower (FIG. 1) can be obtained.

〔The invention's effect〕

According to the present invention, even if the spray-type desulfurization tower becomes large due to the increase in capacity of the boiler, it is possible to reduce the size of the internal component supports as a whole. It is possible to reduce the scaling area. In addition, it is not necessary to provide a vertical part on the branch pipe of the spray nozzle, and it is possible to make a simple spray nozzle, to prolong the contact time between the spray liquid and gas, and to hinder the multi-stage absorption liquid spray pattern. Therefore, desulfurization performance can be improved. Further, the weight of each block can be reduced at the time of factory production or on-site installation, so that a large block can be made and the economy is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a single tower type spray desulfurization tower showing an embodiment of the present invention, FIG. 2A is a sectional view taken along the line II A-II A in FIG. 1, and FIG. IIB-IIB cross-sectional view of the figure, FIG. 2C is a IIC-IIC arrow cross-sectional view of FIG. 2A and FIG. 2B,
The figure is a perspective view of the large truss of the absorption part in Fig. 1, and Fig. 4 is
Schematic diagram of a single tower spray desulfurization tower according to the prior art, No. 5
The figure is a sectional view of the support beam, and FIGS. 6 and 7 are
An enlarged front view of the vicinity of the spray nozzle in FIG. 1 and a sectional view taken along the line VII-VII of FIG. 6, FIG. 8 and FIG.
An enlarged front view of the vicinity of the spray nozzle in FIG. 4, a sectional view taken along the line IX-IX in FIG. 8, and FIGS. 10A and 10B are
FIG. 11 is a view showing left and right half blocks in a perspective view taken along the line II A-II A in FIG. 1, and FIG. 11 is a schematic view of a desulfurization apparatus showing another embodiment of the present invention. 1 ... Gas inlet, 2 ... Coolant spray pipe, 3 ... Gas dispersion plate, 4 (4a, 4b, 4c, 4d) ... Absorber spray pipe, 5 (5a, 5b) ... Demister, 6 ... … Gas outlet, 7…
... Circulation pump, 8 ... Spray type desulfurization tower, 9 ... Spray nozzle, 10 ... Coolant spray piping support, 11 ...
Gas dispersion plate support, 12 (12a, 12b, 12c, 12d) …… Absorption liquid spray piping support, 13 (13a, 13b) …… Demister support, 14 (14a, 14b, 14c, 14d) …… Brace,
20 …… Kobeam, 21 …… Large truss, 22 …… Half block,
23 …… Sidewall.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsushi Ogura 6-9 Takara-cho, Kure-shi, Hiroshima Babcock Hiritsu Co., Ltd. Kure Factory (56) References

Claims (2)

(57) [Claims] 1. A plurality of large trusses having a plurality of large trusses having vertically adjacent supports connected to each other by braces in an absorption tower for contacting a gas to be treated with an absorbing liquid to remove sulfur oxides in the gas. A desulfurization apparatus having a structure of connecting with a beam, installing an absorbing solution spray pipe on the support beam, and spraying the absorbing solution into an absorption tower through a branch pipe branched from the pipe. 2. The desulfurization apparatus according to claim 1, wherein the absorption tower has a large number of large-scale trusses in the vertical direction, and the large-scale trusses of the respective stages are arranged so as to be orthogonal to each other. .