JP2003170039A - Reaction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaction apparatus for which a stirring apparatus, a reliable sealing property in a penetrating part of a rotary shaft to a reaction tower such as an absorption tower, and further installation of a rotating appliance for the reaction tower, and rigidity improvement of the reaction tower are all made of no need; of which appliances can be repaired and replaced with an effect suppressed to the minimum on the operation of the entire facilities and without requiring discharge of a reaction liquid such as an absorption liquid or the like in a liquid pool part; and which is capable of decreasing the excess ratio of a reaction gas such as oxidizing air and lowering the pressure of the reaction gas and thus saving the motive force for a blower or the like. <P>SOLUTION: A stirring liquid supply pipe 13 is connected to a liquid pool part 2 of an absorption tower 4 while being branched from the discharge side of a circulation pump 5 and an ejector 14 for preliminarily mixing oxidizing air A to the absorption liquid 1 is installed in the middle of the stirring liquid supply pipe 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a reaction apparatus such as a wet flue gas desulfurization apparatus equipped with an absorption tower.

[0002]

2. Description of the Related Art Generally, exhaust gas discharged from a coal-fired boiler or the like of a power generation facility contains sulfur oxide (SO ₂ ), so that the wet exhaust gas is discharged to the downstream side of the coal-fired boiler or the like. A desulfurization device is installed, and in the wet flue gas desulfurization device, the exhaust gas and the absorbent are brought into gas-liquid contact to remove the sulfur oxides contained in the exhaust gas.

FIG. 3 and FIG. 4 show an example of a conventional wet flue gas desulfurization apparatus, which normally uses calcium carbonate (CaCO ₃ ) as an absorbent, Absorption tower 4 having a liquid reservoir 2 for absorbing liquid 1 formed in the lower portion and a large number of spray nozzles 3 arranged in the upper portion.
And a circulation pump 5 for pumping up the absorption liquid 1 in the liquid reservoir 2 of the absorption tower 4 and spraying it through the spray nozzle 3 for circulation.
And an oxidizing air blower 7 for supplying oxidizing air A to the liquid reservoir 2 of the absorption tower 4 through an air supply pipe 6, and an electric motor 8 for rotating the stirring blade 10 through a rotary shaft 9 to drive the liquid reservoir. It has a configuration including a stirrer 11 that stirs the absorbent 1 in 2 and a mist eliminator 12 that collects mist in the exhaust gas.

In the case of the wet flue gas desulfurization apparatus as described above, the exhaust gas discharged from a coal burning boiler or the like (not shown) is introduced into the absorption tower 4 of the wet flue gas desulfurization apparatus, and in the absorption tower 4, the absorption liquid is 1 is circulated while being sprayed from a large number of spray nozzles 3 by the operation of the circulation pump 5, and the sulfur oxide contained in the exhaust gas is removed by the gas-liquid contact between the exhaust gas and the absorbing liquid 1, and the sulfur oxidation The exhaust gas from which the substances have been removed is guided to the downstream side after the mist is collected by the mist eliminator 12.

On the other hand, the absorbing liquid 1 which has absorbed the sulfur oxides from the exhaust gas is dripped into the liquid reservoir 2, and in the liquid reservoir 2, the air supply pipe 6 is operated by the operation of the oxidizing air blower 7.
While absorbing air 1 is being blown from the absorbent 1, the absorbent 1 is stirred by the rotation of the stirring blades 10 of the stirrer 11, whereby the absorbent 1 is forcibly oxidized and gypsum (calcium sulfate (CaSO 4 ₄ )) is produced, and the absorbent 1 in the liquid reservoir 2 containing the gypsum is extracted from the bottom of the absorption tower 4 to the gypsum recovery system by the operation of a bleed pump (not shown).

In the wet flue gas desulfurization apparatus shown in FIGS. 3 and 4, the air supply pipe 6 is formed by branching a branch pipe 6c having a large number of nozzle holes 6b from a mother pipe 6a. A so-called pipe sparger method is adopted in which the oxidizing air A is blown into the entire liquid reservoir 2, but other than this, conventionally, for example, as shown in FIGS. 5 and 6, an air supply pipe is used. The so-called side atomization method was adopted in which the tip outlet 6d of 6 was opened near the front of the stirring blade 10 of the stirrer 11 and the oxidizing air A was blown into the vicinity of the front of the stirring blade 10 of the stirrer 11. There is also a wet flue gas desulfurization unit.

[0007]

However, the wet flue gas desulfurization system adopting the pipe sparger system as shown in FIGS. 3 and 4 and the side atomizing system as shown in FIGS. 5 and 6 are adopted. In the case of the wet flue gas desulfurization apparatus described above, the stirring blade 10 of the stirrer 11 is the liquid reservoir 2 of the absorption tower 4.
Since the electric motor 8 is disposed inside and the electric motor 8 is attached to the outside of the absorption tower 4, it is necessary to secure the sealing property at the penetration portion of the rotary shaft 9 into the absorption tower 4, and the stirrer 1
In order to perform repair or replacement of No. 1, it was necessary to drain the absorbing liquid 1 in the liquid reservoir 2, and the operation of the entire power generation facility had to be stopped.

Further, since the electric motor 8 which is a rotating device is attached to the absorption tower 4 having low rigidity, it is necessary to increase the rigidity of the absorption tower 4 in order to secure vibration resistance when the electric motor 8 rotates. there were.

Furthermore, the oxidizing air A is supplied directly into the liquid reservoir 2 in the state of relatively large bubbles and is difficult to mix with the absorbing liquid 1 in the liquid reservoir 2, so that the oxidizing air A is required in excess. Was becoming.

In view of the above situation, the present invention eliminates the need for a stirrer, the need to secure the sealing property at the penetration portion of the rotary shaft to the reaction tower such as the absorption tower, and the repair or replacement of the equipment. It is possible to carry out without removing the reaction liquid such as the absorption liquid in the liquid reservoir, it is possible to minimize the influence on the operation of the entire equipment, and it is possible to eliminate the need to install a rotating device to the reaction tower. And a reactor capable of eliminating the need to increase the rigidity of the reaction tower, further reducing the excess ratio of the reaction gas such as oxidizing air and lowering the pressure of the reaction gas, and reducing the power of the blower etc. Is what you are trying to do.

[0011]

The present invention is a reaction in which a reaction liquid is pumped from a liquid reservoir at the bottom by a circulation pump and circulated, and a reaction gas is blown into the reaction liquid in the liquid reservoir to cause a reaction. A reaction device comprising a tower, wherein the stirring liquid supply pipe is branched from the discharge side of the circulation pump and connected to the liquid reservoir of the reaction tower, and the reaction liquid reacts with the reaction liquid in the middle of the stirring liquid supply pipe. The present invention relates to a reaction device characterized in that an ejector for premixing gas is provided.

According to the above means, the following effects can be obtained.

In the reaction tower, the reaction liquid is pumped from the liquid reservoir at the bottom and circulated by a circulation pump, and a part of the reaction liquid pumped by the circulation pump is branched to a stirring liquid supply pipe, After the reaction gas is premixed by the ejector, it is fed into the liquid reservoir, whereby the reaction liquid in the liquid reservoir is stirred, and the reaction liquid and the reaction gas are reacted.

As a result, it is not necessary to provide a stirrer, it is not necessary to secure the sealing property at the penetration portion of the rotary shaft to the reaction tower, and an ejector or the like as a device for stirring the reaction liquid and reacting it with the reaction gas is used. When performing a repair or replacement, if the stirring liquid supply pipe is shut off by a valve or the like, it is not necessary to drain the reaction liquid in the liquid reservoir, so that it is not necessary to stop the operation of the entire equipment.

Further, since it is not necessary to provide a stirrer, it is not necessary to attach a rotating device to the reaction tower and it is not necessary to increase the rigidity of the reaction tower.

Furthermore, the reaction gas is not directly supplied into the liquid reservoir in the state of relatively large bubbles but is premixed by the ejector and then fed into the liquid reservoir, so that the reaction in the liquid reservoir is carried out. It becomes easy to mix with the liquid, it is not necessary to supply the reaction gas excessively, and since the reaction gas is sucked by the ejector suction force, the pressure is low and it is possible to reduce the power of the blower etc. Become.

In the above reactor, the distance between the axis of the stirring liquid supply pipe connected to the liquid reservoir of the reaction tower and a straight line parallel to the axis of the stirring liquid supply pipe and passing through the center of the liquid reservoir. It is desirable that the reaction liquid fed from the stirring liquid supply pipe swirls the reaction liquid in the liquid reservoir to promote stirring of the reaction liquid.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an example of an embodiment for carrying out the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. 3 to 6
Although it is the same as the conventional one shown in FIG. 2, the feature of this illustrated example is that the stirring liquid supply pipe 13 is branched from the discharge side of the circulation pump 5 as shown in FIGS. In addition to being connected to the liquid reservoir 2 of the absorption tower 4, an ejector 14 for premixing the oxidizing liquid A as a reaction gas with the absorbing liquid 1 as a reaction liquid is provided in the middle of the stirring liquid supply pipe 13. is there.

In the illustrated example, the liquid reservoir 2 of the absorption tower 4
There is a distance L between the axis of the agitated liquid supply pipe 13 connected to and the straight line parallel to the agitated liquid supply pipe 13 and passing through the center of the liquid reservoir 2.

Next, the operation of the illustrated example will be described.

As in the conventional case, the exhaust gas discharged from a coal-fired boiler (not shown) or the like is absorbed by the absorption tower 4 of the wet flue gas desulfurization system.
In the absorption tower 4, the absorption liquid 1 is circulated while being sprayed from a large number of spray nozzles 3 by the operation of the circulation pump 5. The sulfur oxides contained in are removed,
The exhaust gas from which the sulfur oxides have been removed is guided to the downstream side after the mist is collected by the mist eliminator 12.

On the other hand, the absorption liquid 1 which has absorbed the sulfur oxides from the exhaust gas is dropped into the liquid reservoir 2 and is pumped up again by the circulation pump 5 to be circulated, but the absorption liquid pumped up by the circulation pump 5 is absorbed. A part of the liquid 1 branches to the stirred liquid supply pipe 13 and after the oxidizing air A is premixed by the ejector 14,
The absorbent 1 is sent to the liquid reservoir 2, whereby the absorbent 1 in the liquid reservoir 2 is agitated, the absorbent 1 reacts with the oxidizing air A, and the absorbent 1 is forcibly oxidized. , Gypsum (calcium sulfate (CaSO ₄ )) is produced, and the absorbent 1 in the liquid reservoir 2 containing the gypsum is extracted from the bottom of the absorption tower 4 to the gypsum recovery system by the operation of a bleed pump (not shown). Be done.

As a result, unlike the conventional example shown in FIGS. 3 to 6, it is not necessary to provide the agitator 11, and it is not necessary to secure the sealing property at the penetration portion of the rotary shaft 9 to the absorption tower 4. When the ejector 14 as a device for stirring the absorbent 1 and reacting it with the oxidizing air A is repaired or replaced, if the agitated liquid supply pipe 13 is shut off by a valve or the like, the absorption in the liquid reservoir 2 is absorbed. Since it is not necessary to drain the liquid 1, it is not necessary to stop the operation of the entire power generation equipment.

Further, since it is not necessary to provide the agitator 11, it is not necessary to attach the electric motor 8 which is a rotating device to the absorption tower 4 and it is not necessary to increase the rigidity of the absorption tower 4.

Furthermore, the oxidizing air A as a reaction gas is
Rather than being directly supplied into the liquid reservoir 2 in the state of relatively large bubbles, the liquid is not pre-mixed by the ejector 14 and is then supplied to the liquid reservoir 2.
Since it is fed into the liquid reservoir 2, it becomes easy to mix with the absorbing liquid 1 in the liquid reservoir 2, and it is not necessary to excessively supply the oxidizing air A, and the oxidizing air A is sucked by the ejector 14 suction force. The pressure may be low and the power of the oxidizing air blower 7 or the like can be reduced.

Moreover, in the illustrated example, the stirring liquid supply pipe 13 connected to the liquid reservoir 2 of the absorption tower 4 as a reaction tower.
Is parallel to the axis of the stirring liquid supply pipe 13 and the liquid reservoir 2
Since a distance L is formed between the absorption liquid 1 fed from the stirring liquid supply pipe 13 and the straight line passing through the center of the absorption liquid 1, the absorption liquid 1 in the liquid reservoir 2 is swirled. The stirring of 1 is promoted.

In this way, the agitator 11 can be dispensed with, and it is not necessary to secure the sealing property in the penetration portion of the rotary shaft 9 to the absorption tower 4, and the repair or replacement of the equipment can be performed by the absorption liquid in the liquid reservoir 2. It can be performed without removing 1, and the influence on the operation of the entire power generation facility can be minimized.
It is possible to eliminate the need to attach a rotating device to the absorption tower 4, eliminate the need to increase the rigidity of the absorption tower 4, and further reduce the excess ratio of the oxidizing air A, and the ejector 14
Oxidizing air blower 7 can reduce the pressure of oxidizing air A by suction force.
Etc. can be reduced.

The reaction apparatus of the present invention is not limited to the above illustrated example, but a wet flue gas desulfurization apparatus equipped with an absorption tower for injecting oxidizing air into the absorbing solution in the liquid reservoir to cause an oxidation reaction. Other than the above, it can be applied to any reaction device as long as it has a reaction tower that needs to blow a reaction gas into the reaction liquid in the liquid reservoir to carry out reactions such as neutralization and reduction. Needless to say, various changes can be made without departing from the scope of the present invention.

[0030]

As described above, according to the reaction apparatus of the present invention, it is possible to eliminate the need for a stirrer, and to secure the sealing property at the penetration portion of the rotary shaft to the reaction tower such as the absorption tower. The equipment can be repaired or replaced without removing the reaction liquid such as the absorption liquid in the liquid reservoir, and the influence on the operation of the entire equipment can be minimized. It is possible to eliminate the need to install equipment, eliminate the need to increase the rigidity of the reaction tower, reduce the excess rate of the reaction gas such as oxidizing air, and lower the pressure of the reaction gas by the ejector suction force. It is possible to obtain an excellent effect that the power of the above can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an example of an embodiment of the present invention.

FIG. 2 is a view corresponding to a line II-II in FIG.

FIG. 3 is a schematic configuration diagram of a conventional example.

FIG. 4 is a view corresponding to an arrow along line IV-IV in FIG.

FIG. 5 is a schematic configuration diagram of another conventional example.

FIG. 6 is a view corresponding to the arrow VI-VI in FIG.

[Explanation of symbols]

1 Absorption liquid (reaction liquid) 2 liquid reservoir 3 spray nozzles 4 Absorption tower (reaction tower) 5 circulation pumps 7 Oxidizing air blower 13 Stirring liquid supply pipe 14 ejectors A Oxidizing air (reaction gas) L distance

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01F 5/02 F term (reference) 4D002 AA02 AC01 BA02 BA05 BA16 CA01 DA05 DA16 EA07 FA03 HA02 HA08 HA10 4D020 AA06 BA02 BA09 BB03 BC05 CB25 CC05 CC06 CD01 4G035 AB20 AC23 AE13 4G075 AA03 AA37 BA06 BB04 BD13 CA51 EA01 EB01 EC01 EC04 EC11

Claims (2)

[Claims] 1. A reaction apparatus comprising a reaction tower, wherein a reaction liquid is pumped from a liquid reservoir at the bottom by a circulation pump and circulated, and a reaction gas is blown into the reaction liquid in the liquid reservoir to cause reaction. Therefore, the stirring liquid supply pipe is branched from the discharge side of the circulation pump and connected to the liquid reservoir of the reaction tower, and at the middle of the stirring liquid supply pipe,
A reaction apparatus comprising an ejector for premixing a reaction gas with a reaction liquid. 2. A structure in which there is a distance between the axis of the stirring liquid supply pipe connected to the liquid reservoir of the reaction tower and a straight line parallel to the axis of the stirring liquid supply pipe and passing through the center of the liquid reservoir. Claim 1
The reactor described.