JP2001286721A - Gas-solid contact apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-solid contact apparatus capable of well performing gas-liquid contact treatment. SOLUTION: A contact reactor main body 20 through which gas such as exhaust gas flows is partitioned into a plurality of reaction chambers 23 and small holes 28, 29 are formed at the outlet and inlet parts of the reaction chambers and jet nozzles 33, 33a for a neutralizing agent or the like are formed at the inlets of the reaction chambers or in the reaction chambers 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-solid contact device for bringing a gas component into contact with fine particles for reaction.

[0002]

2. Description of the Related Art Conventionally, in boiler exhaust gas treatment, as shown in FIG. 5, exhaust gas from a boiler 10 is removed through a denitration device 11 to remove NOx, and then introduced into a SO ₃ neutralization section 12, where CaCO _{3 and the} like are removed. Neutralizing is performed by gas-solid contact with a neutralizing agent 13, and heat is recovered by a gas air heater 14.
After the dust is removed at 5 and the SO ₂ is removed at the desulfurizer 16, the exhaust gas is exhausted from the chimney 17 to the atmosphere.

As a gas-solid contact device in the SO ₃ neutralizing section 12, a venturi, a baffle plate or the like is used.

[0004]

The neutralizing agent used in the gas-solid contact device is a fine particle having a particle size of 0.1 μm, and even if the fine particle is injected into a gas, it diffuses. Therefore, there is a problem that sufficient gas-solid contact cannot be obtained with a venturi or a baffle plate.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a gas-solid contact device capable of performing good gas-solid contact.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the inside of a contact reactor main body through which a gas such as exhaust gas flows is divided into a plurality of reaction chambers, and an inlet and an outlet of the reaction chamber are provided. This is a gas-solid contact device in which a small hole is provided and an injection nozzle for a neutralizing agent or the like is provided in the entrance of the reaction chamber or in the reaction chamber.

A second aspect of the present invention is the gas-solid contact device according to the first aspect, wherein the reaction chamber is formed in multiple stages.

According to a third aspect of the present invention, there is provided the gas-solid contact device according to the first or second aspect, wherein the upper and lower plates defining the reaction chamber are formed so as to be inclined around the small holes.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, reference numeral 20 denotes a contact reactor main body through which gas flows up and down. A gas introduction line 21 for boiler exhaust gas or the like is connected to an upper portion thereof, and a gas discharge line 22 is connected to a lower portion thereof.

In the contact reactor main body 20, a plurality of reaction chambers 23 are formed in a sectional direction thereof and the reaction chambers 23 are formed.
The upper chamber 24 is located on the upper entrance side of the lower chamber and the lower chamber 25 is located on the lower exit side.
Are formed.

The upper plate 26 and the lower plate 27 of each reaction chamber 23 have
Small holes 28 and 29 having an arbitrary shape such as a circle and a square are formed.

An air line 30 is connected to the contact reactor main body 20, and a neutralizing agent supply hopper 31 is connected to the air line 30 via a feeder 32.

The air line 30 is connected to the contact reactor main body 2.
An injection nozzle 33 is provided so as to extend to an upper chamber 34 above the zero reaction chamber 23 and to face each of the small holes 28.

The air line 30 includes a branch line 30.
a, the branch line 30a extends to each reaction chamber 23, and an injection nozzle 33a is provided to face the small hole 29 in the lower part of each reaction chamber 23.

FIG. 3 shows another embodiment of the present invention.
FIG. 3A shows that the upper and lower plates 24 and 25 of the reaction chamber 23 are formed so as to be inclined about the small holes 26 and 27, and the upper and lower plates 24 and 2 are formed.
5 is such that the neutralizing agent is not deposited on
(B) shows an example in which the reaction chambers 23 are formed in multiple stages.

Next, the operation of the present invention will be described.

Gas such as exhaust gas is introduced from the introduction line 21 into the upper chamber 24 of the contact reactor main body 20, flows through the small holes 28 on the inlet side into the reaction chamber 23, and flows into the small holes 29 on the outlet side.
From the discharge line 22 to the lower chamber 25.

On the other hand, a neutralizing agent such as calcium carbonate is supplied from a neutralizing agent supply hopper 31 to an air line 30 via a feeder 32, and is conveyed by an injection nozzle 33 to an upper chamber 24 above the reaction chamber 23. A part is injected into the reaction chamber 23 from the injection nozzle 33a through the branch line 30a.

The reaction chamber 23 has small holes 28 and 29 above and below it.
The exhaust gas and the neutralizing agent flow into the reaction chamber 23 through the small holes 28, and flow from the reaction chamber 23 to the lower chamber 25 through the small holes 29. The stream becomes turbulent, so that the neutralizer and the gas are sufficiently mixed, and the reaction rate increases.

The neutralizing agent is sprayed or sprayed from the spray nozzles 33, 33a together with air toward the small holes 28, 29 at high speed, so that the aggregated solids are dispersed and gas-solid contact can be sufficiently performed. .

FIG. 4 shows experimental data obtained when calcium carbonate having a particle diameter of 0.1 μm was used as a neutralizing agent and SO ₃ in the exhaust gas was removed. The horizontal axis indicates SO ₃ in the exhaust gas.
The molar ratio of calcium carbonate with respect to the concentration is defined as the removal rate on the vertical axis, and the SO2 when injected while changing the molar ratio of various neutralizing agents.
_{3 The} removal rate was determined. Curve a shows the data obtained when the reaction was neutralized by the conventional venturi-type reactor, and curve b showed the data obtained when the reactor was neutralized by the reactor of the present invention.

As can be seen from FIG. 4, in the prior art, to obtain a removal rate of 100%, a neutralizer having a molar ratio of about 5 times less than that of SO ₃ is required. Injecting only 3 times the neutralizer in molar ratio, the removal rate is 10
The removal rate can be 0%, and even if the molar ratio of the neutralizing agent is twice, the removal rate can be 90%.

In the above embodiment, the small holes 28, 2
Although an example of a circular shape has been described as 9, the shape may be any shape, and the ratio between the cross-sectional area of the reaction chamber 23 and the small hole area may be appropriately set in consideration of the pressure loss and the mixing efficiency. Further, the neutralizing agent injected into the reaction chamber 23 from the injection nozzle 33a may be configured to inject only air to promote agitation of the neutralizing agent injected from the upper injection nozzle 33, and vice versa. A wetting agent may be injected.

[0025]

In summary, according to the present invention, the inside of the reaction chamber is divided into a plurality of reaction chambers, and small holes are provided at the entrances and exits of the reaction chambers. The reaction is sufficiently performed to increase the reaction rate. In addition, since the air and the neutralizing agent are jetted from the jet nozzle toward the small holes at a high speed, the aggregated solids are dispersed and the gas-solid contact can be sufficiently performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 4 is a diagram showing experimental data of the SO ₃ removal rate in the reactor of the present invention and the conventional example.

FIG. 5 is a diagram showing a boiler exhaust gas treatment system.

[Explanation of symbols]

 Reference Signs List 20 Contact reactor main body 23 Reaction chamber 28, 29 Small hole 33, 33a Injection nozzle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K070 DA03 DA17 DA23 DA38 4D002 AA02 AC01 BA03 BA14 CA11 DA05 DA16 FA02 GA02 GB06 GB12 HA08 4D020 AA06 BA02 BA09 BB01 CA08 CC07 CC08 CD02 DA02 DB05 DB10 DB11

Claims (3)

[Claims] 1. A reaction reactor body in which a gas such as exhaust gas flows is divided into a plurality of reaction chambers, and a small hole is provided at an entrance and exit of the reaction chamber. A gas-solid contact device comprising an injection nozzle. 2. The gas-solid contact device according to claim 1, wherein the reaction chamber is formed in multiple stages. 3. The gas-solid contact device according to claim 1, wherein the upper and lower plates for partitioning the reaction chamber are formed to be inclined about the small holes.