JPH0533828U - Absorption tower of flue gas desulfurization equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an absorption tower that does not require a stirrer and does not have an absorption liquid circulation line that cannot be used. [Structure] A cylindrical portion 1 is provided in the center of the lower part, and an inverted conical shape is formed in which a bottom surface 3 from the outer circumference of the cylindrical portion 1 to the outer circumference of the tower main body 2 is formed in an upslope, and the bottom surface 3 has an inclined upper surface that is continuously continuous. In addition, a strainer 9 extending in a fan shape along the inner surface of the cylindrical portion 1 is provided, and a plurality of absorbing liquid pipes 10 radially protruding from the strainer 9 to the outside of the cylindrical portion 1 are provided.
A plurality of circulation pumps 11 connected to the above and communicating with the absorption liquid spraying device 8 are arranged immediately below the bottom surface 3.
The absorption liquid 4 in the liquid storage tank 5 is pressure-fed to the absorption liquid spraying device 8 and ejected in a shower shape to absorb the sulfurous acid gas contained in the exhaust gas.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an absorption tower of a flue gas desulfurization device.

[0002]

[Prior Art]

 Exhaust gas discharged from the boiler contains sulfur oxides, nitrogen oxides, soot and dust. Therefore, especially in large-scale boilers, measures have been taken to reduce the content of the harmful substances and remove them from the combustion gas by selecting fuel and improving combustion technology.

FIG. 3 is a schematic cross-sectional view of an example of an absorption tower of a flue gas desulfurization device for removing sulfur oxides, which has a flat bottom portion a and has an absorbing liquid b (for example, produced by a desulfurization reaction). A plurality of liquid storage tanks c that can store gypsum and lime slurry that is an absorbent) are provided in the lower part of the upper space at predetermined intervals in the vertical direction, and the absorbent liquid b can be jetted in a shower shape. It has an absorbent spray device d.

Further, an exhaust gas duct g is connected to the tower wall f of the absorption tower e between the liquid storage tank c and the absorbing solution spraying device d, and a processing gas duct h leading to equipment at the rear is connected to the top of the absorption tower e. Are connected.

Further, in order to feed the absorbing liquid b from the liquid storage tank c to the absorbing liquid spraying device d and circulate it in the absorption tower e, the absorbing liquid is provided between the lower part of the liquid storing tank c and each absorbing liquid spraying device d. A pipe i is provided, a circulation pump j is provided in the middle of the absorption liquid pipe i, and a strainer k is provided between the circulation pump j and the liquid reservoir c.

Furthermore, in order to prevent the absorption liquid b from settling in the liquid storage tank c and the slurry in the absorption liquid b from settling at the bottom of the liquid storage tank c, the absorption liquid b is circumferentially formed on the tank wall below the liquid storage tank c. A plurality of stirrers 1 are arranged at predetermined intervals. In addition, o is a frame provided to inspect the circulation pump j.

The circulation pump j is operated to suck the absorption liquid b from the liquid storage tank c through the strainer k, pressure-feed it to the absorption liquid spray device d, and eject it from the absorption liquid spray device d as a shower of the absorption liquid b. Then, the flue gas (arrow m) introduced into the absorption tower e through the flue gas duct g passes through the shower of the absorbing liquid b, while the sulfurous acid gas contained in the flue gas is lime as an absorbent. It reacts with the slurry (contained in the absorption liquid b) to form calcium sulfite, which is dropped together with the absorption liquid b into the liquid storage tank c and temporarily stored therein, and the exhaust gas (arrow shown in FIG. n) is guided to the rear facility through the processing gas duct h.

[0008]

[Problems to be solved by the device]

 However, in the above-mentioned absorption tower e of the flue gas desulfurization facility, an agitator 1 is indispensable for preventing the absorption liquid b from settling down below the liquid storage tank c and precipitating lime, and a circulation pump. If the strainer k provided on the upstream side of j is clogged, there is a problem that the absorption liquid b circulation line where the strainer k is provided becomes unusable.

In view of the above-mentioned circumstances, the present invention provides an absorption tower of a flue gas desulfurization device in which an agitator can be omitted and an unusable absorption liquid circulation line does not occur even if a strainer is clogged. It is intended to be provided.

[0010]

[Means for Solving the Problems]

 The absorption tower of the flue gas desulfurization apparatus according to claim 1 of the present invention is provided with a liquid storage tank in the lower part of the tower body and an absorption liquid spray device in the upper space, and between the liquid storage tank and the absorption liquid spray device. The absorption liquid pipe via a circulation pump is connected to the suction pump, and the absorption pump in the liquid storage tank is sucked by operating the circulation pump and pressure-fed to the absorption liquid spray device. In an absorption tower that absorbs sulfurous acid gas contained in the exhaust gas introduced into the tower body by ejecting a shower, it has a tubular part in the center of the lower part, and goes up the bottom surface from the outer circumference of the tubular part to the outer circumference of the tower main body. A plurality of strainers each having an inclined conical shape formed with a slope, having a sloped upper surface that is smoothly continuous with the bottom surface and extending along the inner surface of the cylindrical portion are provided in the cylindrical portion, and radially project from the strainer to the outside of the cylindrical portion. The absorption liquid pipe of It has a configuration which is disposed a plurality of circulation pumps for communicating via the absorption liquid pipe is connected to the absorption liquid pipe and into said absorption liquid spray device.

The absorption tower of the flue gas desulfurization device according to claim 2 of the present invention is the absorption tower of the flue gas desulfurization device according to claim 1 of the present invention, in which a circulation pump is provided directly below the bottom surface of the liquid storage tank. It has a different structure.

[0012]

[Action]

 Therefore, in any of the absorption towers of the flue gas desulfurization apparatus described in claims 1 and 2 of the present invention, the absorption liquid in the liquid storage tank flows along the inclined bottom surface of the inverted conical shape, and the lower part of the tower main body. Collected in a cylindrical part formed in the center. The absorbing liquid flowing into the cylindrical portion is sucked by the circulation pump through the strainer provided in the cylindrical portion and is pressure-fed to the absorbing liquid spray device, and is ejected from the absorbing liquid spray device as a shower of the absorbing liquid.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an outline of an absorption tower of a flue gas desulfurization apparatus of the present invention, and FIG. 2 is a view taken along the line II-II of FIG.

A cylindrical portion 1 having a predetermined diameter and a predetermined height is provided in the central portion, and an upslope having a predetermined inclination angle is provided between the outer periphery of the upper end of the cylindrical portion 1 and the outer periphery of the lower end of the tower body 2. A cylindrical tower main body 2 having an inverted conical bottom surface 3 and having a predetermined diameter and height is provided, and a lower portion of the tower main body 2 is a liquid storage tank 5 capable of storing the absorbing liquid 4, and the liquid storage tank An exhaust gas duct 6 is connected to the tower wall slightly above 5, and a treatment gas duct 7 leading to equipment in the rear is connected to the top of the tower body 2.

Further, a plurality of absorbing liquid spraying devices 8 are arranged in the upper space of the tower main body 2 at predetermined intervals in the vertical direction and are capable of ejecting the absorbing liquid 4 in a shower shape.

Further, the bottom surface 3 of the liquid reservoir 5 has an inclined upper surface that extends continuously toward the center of the cylindrical portion 1, and extends in a fan shape along the inner surface of the cylindrical portion 1 to extend approximately half the circumference of the cylindrical portion 1. A strainer 9 having a length extending over is provided in the cylindrical portion 1.

Furthermore, a plurality of absorbing liquid pipes 10 radially protruding from the strainer 9 to the outside of the cylindrical portion 1 are provided, and a predetermined space is provided below the bottom surface 3 of the liquid reservoir 5 in the circumferential direction of the cylindrical portion 1. A plurality of circulation pumps 11 arranged are connected to the absorption liquid pipe 10, and a hook 12 for attaching a hanging tool used when inspecting the circulation pump 11 is provided below the bottom surface 3 immediately above the circulation pump 11, A plurality of absorption liquid pipes 13 that communicate with the respective absorption liquid spray devices 8 from the discharge port of the circulation pump 11 are arranged.

Then, in order to prevent the absorption liquid 4 from staying in the liquid storage tank 5 and also to oxidize the absorption liquid 4 into gypsum slurry, a plurality of oxidizing air diffusers 14 are provided on the bottom surface 3 of the liquid storage tank 5. It is installed at a predetermined interval. Reference numeral 15 is a soundproof cover for sealing the lower part of the liquid storage tank 5 of the tower body 2 along the circumferential direction.

Next, the operation will be described. When the circulation pump 11 is operated, the absorption liquid 4 is sucked from the liquid storage tank 5 through the strainer 9 and pressure-fed to the absorption liquid spray device 8 and is ejected from the absorption liquid spray device 8 as a shower of the absorption liquid 4. While the exhaust gas (arrow m) guided into the tower main body 2 of the absorption tower through the exhaust gas duct 6 passes through the shower of the absorbent 4, the sulfur dioxide gas contained in the exhaust gas is the lime slurry which is the absorbent. It reacts with (contained in the absorbing liquid 4) to become calcium sulfite, drops into the liquid storage tank 5 together with the absorbing liquid 4, flows along the slope of the inverted cone-shaped bottom surface 3, and descends while being temporarily stored. Then, it is again sucked by the circulation pump 11 and sent under pressure to the absorbent spray device 8.

Further, when the oxidizing air diffuser 14 is operated, air is mixed in and dissipated in the liquid storage tank 5 to prevent the absorption liquid 4 from staying and oxidize the absorption liquid 4 to react with the gypsum slurry.

Thus, the exhaust gas (arrow n) treated as described above in the absorption tower 4 is guided to the equipment at the rear through the treated gas duct 7.

In the absorption tower of the present embodiment, the bottom surface 3 of the liquid storage tank 5 has an inverted conical shape, and the absorption liquid 4 is formed so as not to flow along the slope of the bottom surface 3 to cause precipitation of lime. In addition, the oxidizing air diffuser 14 can be disposed below the liquid reservoir 5. Further, since the strainer 9 is provided in the cylindrical portion 1 in the liquid reservoir 5, the element of the strainer 9 can be miniaturized, and the strainer 9 is formed in a fan shape so as to radially project from the strainer 9 to the outside of the cylindrical portion 1. Since a plurality of absorbing liquid pipes 10 are provided, even if a part of the strainer 9 is clogged, the absorbing liquid 4 passes through the unclogging part of the strainer 9 and flows to each absorbing liquid pipe 10. Does not create a disabling line. Furthermore, since the circulation pump 11 is arranged below the liquid reservoir 5, the installation space of the absorption tower can be reduced. Furthermore, if a hook 12 for detecting the circulating pump 11 is provided below the bottom surface 3 of the liquid storage tank 5, a frame like the conventional example becomes unnecessary, and by sealing the lower part of the liquid storage tank 5 with a soundproof cover 15. The noise emitted from the circulation pump 11 can be completely contained.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the shape of the cylindrical portion (shown by reference numeral 1 in the figure) may be a cylindrical shape other than the cylindrical shape, and the strainer ( It is needless to say that the shape (indicated by reference numeral 9 in the figure) may be a shape other than a fan shape, and various modifications can be made without departing from the scope of the present invention.

[0025]

[Effect of the device]

 According to the absorption tower of the flue gas desulfurization apparatus of the present invention, various excellent effects as described below can be obtained.

I) Since the bottom surface of the liquid storage tank has an inverted conical shape so that the absorbing liquid does not flow along the slope of the bottom surface and lime is not precipitated, a stirrer is not required at all.

II) Since the strainer is provided in the cylindrical portion in the liquid reservoir, the strainer element can be downsized.

III) Since the strainer is formed in a fan shape and a plurality of absorbing liquid pipes radially protruding from the strainer to the outside of the cylindrical portion are provided, the absorbing liquid will not be absorbed even if a part of the strainer is clogged. Since it flows through the non-clogging part to each absorption liquid pipe, there is no line that cannot be used.

IV) Since the circulation pump is arranged below the liquid reservoir, the installation space of the absorption tower can be reduced. Therefore, it is extremely useful economically.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an absorption tower of a flue gas desulfurization apparatus of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a sectional view schematically showing an example of an absorption tower of a conventional flue gas desulfurization apparatus.

[Explanation of symbols]

 1 Cylinder 2 Tower Main Body 3 Bottom 4 Absorbing Liquid 5 Liquid Reservoir 8 Absorbing Liquid Sprayer 9 Strainer 10 Absorbing Liquid Pipe 11 Circulating Pump 13 Absorbing Liquid Pipe

Claims (2)

[Scope of utility model registration request] 1. A liquid storage tank is provided in the lower part of the tower body, an absorption liquid spray device is provided in the upper space, and an absorption liquid pipe via a circulation pump is provided between the liquid storage tank and the absorption liquid spray device. By operating the circulation pump, the absorption liquid in the liquid storage tank is sucked and pressure-fed to the absorption liquid spray device, and the shower of the absorption liquid is ejected from the absorption liquid spray device to generate the exhaust gas introduced into the tower body. In the absorption tower that absorbs the sulfurous acid gas contained, it has a cylindrical portion in the lower center, and the bottom surface from the outer circumference of the cylindrical portion to the outer circumference of the tower body has an inverted conical shape formed in an upslope, and a slope continuously continuous with the bottom surface. A strainer having an upper surface and extending along the inner surface of the tubular portion is provided in the tubular portion, and a plurality of absorption liquid pipes radially protruding from the strainer to the outside of the tubular portion are provided, and the absorption liquid sprayer is connected to the absorption liquid pipe and Dress An absorption tower of a flue gas desulfurization apparatus, characterized in that a plurality of circulation pumps communicating with the equipment via an absorption liquid pipe are arranged. 2. The absorption tower of the flue gas desulfurization device according to claim 1, wherein a circulation pump is provided directly below the bottom surface of the liquid storage tank.