JPH06198125A - Gas turning device for semi-dry desulfurizing evaporation reactor - Google Patents

Abstract

PURPOSE:To keep constant the flow rate of exhaust gas from an exhaust gas turning duct to a reactor and to improve the mixing of the exhaust gas and slurry spray by installing movable guide vanes and a vane opening/closing control means and automatically controlling the gap of the movable vanes in the exhaust gas turning duct according to the variation in plant load. CONSTITUTION:Movable guide wanes 6 whose upper ends are attached pivotally to the upper ends of fixed guide wanes 7 through hinges so that the movable guide vanes 6 may be opened and closed and a wane opening/closing control means for simultaneously opening/closing the movable vanes 6 according to the variation in plant load are provided. When a plant load is maximum, the movable guide vanes 6 of a movable wane valve 1 and the fixed guide wanes 7 of a fixed vane structure 2 almost coincide with each other in parallel, but when the plant load becomes small, the movable guide vanes each are automatically rotated around a rotating shaft 4 by a vane gap automatic control mechanism to squeeze the gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas swirling device for a semi-dry desulfurization evaporative reaction tower.

[0002]

2. Description of the Related Art Mainly S from the exhaust gas from boilers
As a desulfurization evaporative reaction tower for removing O ₂ , conventionally, for example, as shown in the vertical cross-sectional view of FIG. 6 and the plan view of FIG. It is known that the vertical double-sided exhaust gas swirling duct 02 is connected and the vertical cylindrical evaporation reaction tower main body 03 is connected to the lower end thereof. In such a desulfurization evaporative reaction tower, the exhaust gas 04 flowing tangentially from the introduction duct 01 into the upper end of the annular space of the exhaust gas swirling duct 02
Descends along the outer cylinder 05 and the inner cylinder 06 of the exhaust gas swirling duct 02, and becomes a swirling flow by a plurality of fixed guide vanes 07 radially attached to the lower end of the exhaust gas swirling duct 02 to form a swirling flow in the reaction tower body 03. It flows into the upper end. On the other hand, the alkaline desulfurizing agent slurry 08 using slaked lime flows down the inside of the inner cylinder 06 in a slurry supply pipe 09, flows out from the lower end opening thereof, and is disposed inside the inner cylinder 06 at that time. The rotary sprayer 012 driven by the motor 011 of the rotary atomizer 010 atomizes the slurry into a slurry spray 013 and swirls down the inside of the reaction tower body 03.
_It gradually evaporates while reacting to the _two components and performing desulfurization,
The produced reaction solid substance 014 is discharged together with the gas 016 from the outlet duct 015 in the lower part of the reaction tower body 03, and is collected by a dust collecting mechanism (not shown). The outflow angle of the exhaust gas 04 flowing out into the reaction tower body 03 is adjusted to be constant by the length l of the fixed guide vanes 07, the pitch t, and the outflow angle α as shown in the partial cross-sectional view of FIG.

However, in such a device, the slurry spray 013 sprayed by the mechanical rotating disk 012 is used.
Since the flow velocity and particle size of the exhaust gas are almost constant, the plant side fluctuates greatly such as a 2/4 partial load, and the flow velocity of the swirling flow of the exhaust gas 04 from the exhaust gas introduction duct 02 to the reaction tower body 03 is large. When it falls to the width, exhaust gas 04
And the slurry spray 013 are mixed poorly, so that the desulfurization rate in the reaction tower body 03 is lowered.

[0004]

The present invention has been proposed in view of such circumstances, and makes the swirling flow velocity of the exhaust gas to the evaporation reaction column almost constant despite the fluctuation of the load of the plant. It is an object of the present invention to provide a gas swirling device for a semi-dry desulfurization evaporative reaction tower that is capable of mixing exhaust gas and a slurry spray and has excellent desulfurization properties.

[0005]

Therefore, according to the present invention, an exhaust gas introduction duct from a plant is tangentially connected to an upper end portion of an annular space formed by a vertical coaxial outer cylinder and an inner cylinder. A vertical exhaust gas swirl duct having a vertical cylindrical reaction tower main body connected to the lower end of the above, a slurry desulfurizing agent supply / spreader arranged at the lower end of the inner cylinder, and an equal interval at the lower end of the annular space. In a gas swirling device of a semi-dry desulfurization evaporative reaction tower having a plurality of fixed guide vanes for swirling gas radially arranged at the upper end, the upper ends of the gas swirling devices can be opened and closed via hinges to the upper ends of the fixed guide vanes, respectively. The movable guide vanes attached to the movable guide vanes, and a vane opening / closing control unit that simultaneously opens and closes the movable guide vanes according to the load variation of the plant. Wherein the maintained substantially constant exhaust gas flow rate into the column body.

[0006]

According to this structure, the exhaust gas introduction duct from the plant is tangentially connected to the upper end of the annular space formed by the vertical outer cylinder and the inner cylinder, and the vertical end is provided at the lower end of the annular space. A vertical exhaust gas swirling duct to which the main body of the cylindrical reaction tower is connected, a slurry-like desulfurizing agent supply / spreader respectively arranged at the lower end of the inner cylinder, and radially at equal intervals at the lower end of the annular space. In a gas swirling device of a semi-dry desulfurization evaporation reaction tower having a plurality of fixed guide vanes for swirling gas arranged, the upper ends thereof are pivotally attached to the upper ends of the respective fixed guide vanes via a hinge so that they can be opened and closed. Since the movable guide vanes and the vane opening / closing control means that simultaneously opens and closes the movable guide vanes according to the fluctuation of the load of the plant are provided, the exhaust gas swirling duct according to the fluctuation of the load of the plant. Can automatically control the gap of the movable vane valve, keep the exhaust gas flow rate from the exhaust gas swirl duct into the reaction tower body is constant, a good mixing of the flue gas and the slurry spray.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same reference numerals as those in FIGS. 6 to 8 denote the same members, respectively. First, in the vertical sectional view of FIG. 1 and the plan view of FIG. Reference numerals 1 and 2 denote movable vane valves provided between the outer cylinder 05 and the inner cylinder 06 at the lower end of the exhaust gas swirling duct 02, respectively.
It has a fixed vane structure. Next, in the partial cross-sectional view of FIG. 3 and the perspective view of FIG. 4, 3 is a horizontal annular rack which is laid along the inner cylinder 06 (FIG. 1) at its lower end and is rotated by a motor (not shown). A plurality of horizontal rotary shafts, the inner ends of which are meshed with the annular rack 3 via the pinion gears 5, the outer ends of which are supported by the outer cylinder 05 and which extend substantially radially, and the upper ends of the rotary shafts 4 which are fixed to the respective rotary shafts 4, respectively. With the movable guide vanes that are rotatably arranged within the vertical plane between the inner cylinder 06 and the inner cylinder 06, the annular rack 3 to the movable guide vanes 6 cooperate to form the movable vane valve 1. Reference numeral 7 is a fixed guide vane whose upper end is suspended by each rotating shaft 4 and whose outer end is supported by the outer cylinder 05. The rotating shaft 4, the fixed guide vane 7 and the like cooperate to form the fixed vane structure 2. . t _O, t ₁ is the initial gap respectively, setting a gap, alpha _0, alpha ₁ the initial angles, are set angle.

In such an apparatus, as shown by the solid line in FIG. 3, when the plant is at maximum load, the movable vane valve 1
Although the movable guide vanes 6 and the fixed guide vanes 7 of the fixed vane structure 2 are parallel and substantially coincident with each other, when the load on the plant becomes small, the movable guide vanes 6 are automatically moved by an automatic vane clearance control mechanism (not shown). Rotates around the rotation axis 4, and the angle of the movable guide vane 6 changes from the initial angle α ₀ to the set angle α ₁ as shown by the chain line in the figure, and the movable guide vane 6 and the fixed guide vane 7 Since the initial clearance t ₀ between and is narrowed to the set clearance t ₁ , the flow speed of the exhaust gas 04 is increased so as to be the same as that at the maximum load. Here, the flow chart of FIG. 5 shows a procedure for automatically adjusting the plant load and the movable vane valve opening.

According to the apparatus of this embodiment, the exhaust gas introducing duct from the plant is tangentially connected to the upper end of the annular space formed by the vertical outer coaxial cylinder and the inner cylinder. A vertical exhaust gas swirl duct having a vertical cylindrical reaction tower body connected to the lower end of the slurry, a slurry-like desulfurizing agent supply / sprayer disposed at the lower end of the inner cylinder, and a lower end of the annular space. In a gas swirling device of a semi-dry desulfurization evaporative reaction tower having a plurality of fixed guide vanes for swirling gas radially arranged at intervals, the upper ends of the gas swirling devices can be opened and closed via hinges to the upper ends of the fixed guide vanes. Since the pivotally mounted movable guide vanes and the vane opening / closing control means that simultaneously opens and closes the movable guide vanes according to the fluctuation of the load of the plant are provided, depending on the fluctuation of the load of the plant. The clearance of the movable vane valve of the gas swirl duct can be automatically controlled, the exhaust gas flow rate from the exhaust gas swirl duct to the reaction tower body can be kept constant, and the mixing of the exhaust gas and the slurry spray becomes good, and therefore the desulfurization rate in the reaction tower body Is improved.

[0010]

In summary, according to the present invention, the exhaust gas introduction duct from the plant is tangentially connected to the upper end portion of the annular space formed by the vertical outer cylinder and the inner cylinder, and is connected to the lower end of the annular space. A vertical exhaust gas swirl duct to which a vertical cylindrical reaction tower main body is connected, a slurry-like desulfurizing agent supplying / spraying device arranged at the lower end of the inner cylinder, and radially at equal intervals at the lower end of the annular space. In a gas swirling device of a semi-dry desulfurization evaporation reaction tower having a plurality of fixed guide vanes for swirling gas arranged, the upper ends thereof are pivotally attached to the upper ends of the respective fixed guide vanes via a hinge so that they can be opened and closed. A movable guide vane and a vane opening / closing control unit that simultaneously opens and closes each of the movable guide vanes according to a change in the load of the plant, to the reaction tower main body despite the change in the load of the plant. By keeping the exhaust gas flow rate almost constant, the swirling flow rate of the exhaust gas to the evaporation reaction tower can be made almost constant despite fluctuations in the load of the plant, and the desulfurization property that mixes the exhaust gas and the slurry spray well is excellent. The present invention is extremely useful industrially because a gas swirling device for a semi-dry desulfurization evaporative reaction tower is obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partial cross-sectional view taken along the line III-III of FIG.

4 is a perspective view showing a movable vane valve 1 and a fixed vane structure 2 of FIG. 1. FIG.

FIG. 5 is a flowchart showing an automatic adjustment procedure of the plant load and the clearance of the movable vane valve 1.

FIG. 6 is a vertical sectional view showing a known evaporation reaction column for desulfurization.

FIG. 7 is a plan view of FIG.

8 is a partial cross-sectional view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

1 Movable vane valve 2 Fixed vane structure 3 Annular rack 4 Rotating shaft 5 Pinion gear 6 Movable guide vane 7 Fixed guide vane 01 Introducing duct 02 Exhaust gas swirling duct 04 Exhaust gas 05 Outer cylinder 06 Inner cylinder 010 Motor 012 Rotating disk t ₀ Initial clearance t ₁ Set clearance α ₀ Initial angle α ₁ Set angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutaka Tomimatsu 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe Sanryo Heavy Industries Ltd. Kobe Shipyard (72) Inventor Morio Kagami Wadazaki-cho, Hyogo-ku, Kobe 1-1-1 Sanryo Heavy Industries Co., Ltd. Kobe Shipyard

Claims (1)

[Claims] 1. An exhaust gas introducing duct from a plant is tangentially connected to an upper end of an annular space formed by a vertical coaxial outer cylinder and an inner cylinder, and a vertical cylindrical reaction tower main body is provided at a lower end of the annular space. A vertical exhaust gas swirling duct connected, a slurry desulfurizing agent supply / spreader arranged at the lower end of the inner cylinder, and a plurality of swirl radially arranged at the lower end of the annular space at equal intervals. In a gas swirling device of a semi-dry desulfurization evaporative reaction tower having a fixed guide vane for gas, a movable guide vane whose upper end is pivotally attached to the upper end of each fixed guide vane via a hinge so as to be openable and closable, and the plant described above. Control means for simultaneously opening and closing the movable guide vanes according to the load fluctuation of the plant, the exhaust gas flow rate to the reaction tower main body is kept substantially constant despite the load fluctuation of the plant. A gas swirling device for a semi-dry desulfurization evaporative reaction tower.