JPH10235146A - Fluidized bed reaction tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize desulfurizing particles during the movement from a fludized bed to a separate fluidized bed for the purpose of desuflurization in a fluidized bed reaction tower having multistage fluidized beds. SOLUTION: This reaction tower constituted so as to remove a sulfur component from gas generated by gasifying fuel such as coal by a desulfurizing agent is provided with multistage fluidized beds 8a, 8b formed in a tower main body 1, an overflow pipe 7 allowing desulfurizing agent particles of an upper stage 1b to flow down to a lower stage 1a and an air stream feed pipe 4 feeding the desulfurizing agent particles of the lower stage 1a to the fluidized bed of the upper stage 1b by fluidizing gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed reactor for removing sulfur from a gasified gas obtained by gasifying a fuel such as coal, and more particularly to a fluidized bed reactor having a multistage fluidized bed formed by partitioning a tower body with a dispersion plate. Forming and providing an overflow pipe for allowing the upper desulfurizing agent particles to flow down to the lower stage, and providing a gas or other fuel such as coal provided with an airflow carrying tube for carrying the lower desulfurizing agent particles to the upper fluidized bed with a fluidized gas. The present invention relates to a fluidized bed reactor for removing sulfur from a gasified gas by a desulfurizing agent.

[0002]

2. Description of the Related Art In an integrated gasification combined cycle system (IGCC) or the like that gasifies a fuel such as coal to generate a high-temperature gasified gas and uses it for power generation, the sulfur content (H ₂ In order to remove S and COS, a reaction tower (desulfurization tower) is provided to form a fluidized bed with reactive particles such as iron oxide or zinc, and sulfur in the gas is reacted with these particles to perform desulfurization. .

In the case of a conventional reaction column, generally, the main body of the column is partitioned by a gas-permeable dispersing plate to form a multi-stage (in many cases, upper and lower) fluidized beds, and the fluidized bed of each stage is formed by an upper fluid bed. The desulfurizing agent is connected to the next lower stage (fluidized bed) from the stage (fluidized bed) by an overflow pipe for flowing down the desulfurizing agent.

[0004] In the conventional reaction tower, the desulfurizing agent introduced into the uppermost fluidized bed of the reaction tower (from the regeneration tower) flows down through the overflow pipes to the lowermost fluidized bed in order. In each fluidized bed, a gasification gas (product gas) flowing upward from below in the reaction tower is contacted and desulfurized. The desulfurizing agent that has flowed down to the lowermost fluidized bed is sent to the regeneration tower to be regenerated, and then returned to the uppermost fluidized bed again.
Hereinafter, this process is repeated.

[0005]

However, in the case of the conventional reaction tower as described above, while the desulfurizing agent flows down from the upper stage to the lower stage through the overflow pipe (that is, the desulfurizing agent overflows). (When inside the flow tube), the product gas cannot contact the desulfurizing agent, and the product gas passes through the dispersion plate from the lower stage to the upper stage of the fluidized bed without contact with the desulfurizing agent. . In other words, there is a problem that the desulfurizing agent moving in the overflow pipe is not effectively used.

Accordingly, an object of the present invention is to provide a fluidized bed reactor having a multi-stage fluidized bed capable of utilizing desulfurizing agent particles being transferred from a fluidized bed to another fluidized bed for desulfurization. That is.

[0007]

Means for Solving the Problems To achieve the above object, the invention of claim 1 is directed to a fluidized bed reactor for removing sulfur from a gasified gas obtained by gasifying a fuel such as coal with a desulfurizing agent. A multi-stage fluidized bed is formed in the main body, an overflow pipe is provided to allow the upper desulfurizing agent particles to flow down to the lower stage, and an airflow transfer tube is provided to transfer the lower desulfurizing agent particles to the upper fluidized bed by the gasification fluidizing gas. It is configured.

According to a second aspect of the present invention, a nozzle for flowing an airflow in a radial direction is formed at an upper end of the airflow transport pipe.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a sulfur content (H ₂ S and C ₂ ) contained in a gasified gas (product gas) obtained by gasifying a fuel such as pulverized coal.
FIG. 1 shows a schematic view of a fluidized bed reactor according to the present invention, which removes OS and the like using a dry desulfurizing agent in a fluidized bed composed of multiple stages. In the present embodiment, a description is given of a configuration in which a fluidized bed has two upper and lower stages.

In the present embodiment, the fluidized bed reaction tower has a tower body 1, and as shown in FIG. 1, the tower body 1 is divided into lower and upper sections 1a and 1b by a gas-permeable dispersing plate 2.
And is divided into.

In the lower part of the lower part 1a, another dispersion plate 3 having air permeability and a regeneration tower (not shown) for supplying a sulfurized desulfurizing agent.
And a desulfurizing agent delivery port 5 to be sent to
A product gas supply means (not shown) is connected to the bottom of the lower section 1a.

On the other hand, a desulfurizing agent inlet 6 through which the regenerated desulfurizing agent is introduced from the regenerating tower is provided in the upper part of the upper section 1b as shown in the figure. Further, processing equipment (not shown) (not shown) (not shown) at the subsequent stage is connected to the top of the upper stage 1b of the reaction tower 1.

In the lower part 1a, a lower fluidized bed 8a is formed by desulfurizing agent particles, while in the upper part 1b, an upper fluidized bed 8b is formed by desulfurizing agent particles.

In the lower section 1a and the upper section 1b, an air flow conveying pipe 4 for sending desulfurizing agent particles (reactive particles) from the lower section 1a to the upper section 1b by a gas stream flows through the dispersion plate 2 as shown in the drawing. Provided. Also, the lower section 1a and the upper section 1b
An overflow pipe 7 for returning the desulfurizing agent from the upper portion 1b to the lower portion 1a to maintain the level of the desulfurizing agent in the upper portion 1b at a certain level or less is provided as shown in FIG. .

The upper end 4a of the airflow conveying pipe 4 is shown in FIG.
As shown in (enlarged view of the upper end portion of the airflow transport pipe 4), the desulfurization agent particles are configured in a nozzle shape with a jet port provided sideways, and discharged from the upper end 4 a through the airflow transport pipe 4. Are spouted radially into the upper section 1b of the reaction tower 1 and are quickly dispersed in the gas and the reaction particles.

The diameter of the air flow transport pipe 4 and the air permeability of the dispersion plate 2 are determined by the air flow transport through the air flow transport pipe 4 and the dispersion plate 2.
And the rise (i.e., fluidization) of the gas via the gas is carried out in a well-balanced manner.

The particles (reactive particles) of the dry desulfurizing agent regenerated in the regeneration tower (not shown) are introduced from the desulfurization agent inlet 6 into the upper section 1b of the reaction tower 1, and the desulfurization introduced into the upper section 1b. When the height of the agent reaches a certain level, the agent drops through the overflow pipe 7 and is successively introduced into the lower portion 1a.

On the other hand, a product gas containing sulfur is introduced from the bottom of the reaction tower 1 to the lower section 1a via the dispersion plate 3,
As a result, the reaction particles in the lower portion 1a are fluidized to form the lower fluidized bed 8a. In the lower fluidized bed 8a, the reaction gas of the desulfurizing agent and the generated gas are brought into solid-gas contact, so that the generated gas is desulfurized. The desulfurizing agent sulfided by the desulfurization is sent to the regeneration tower via the desulfurizing agent outlet 5 and is regenerated.

The gas desulfurized in the lower fluidized bed 8a of the lower section 1a is transferred from the lower section 1a to the upper section 1 via the airflow conveying pipe 4.
b, and the airflow generated at this time also causes the reaction particles to move in the airflow transport pipe 4 from the lower section 1a to the upper section 1b.

That is, in the present invention, both the sulfur-containing gas and the desulfurizing agent reactant particles are moved from the lower section 1a to the upper section 1b via the gas flow transport pipe 4, so that the gas flow inside the gas flow transport pipe 4 is also performed. Solid-gas contact between the gas and the reaction particles, that is, desulfurization can be performed.

The gas and the reaction particles transported in the airflow transport pipe 4 as described above are deposited on the upper end 4a of the airflow transport pipe 4.
From the reactor 1 into the upper stage 1b. Air flow transport pipe 4
As described above, the upper end 4a is formed in the shape of a nozzle having a jet port on the side, so that gas and reactive particles are jetted radially into the upper section 1b, Disperse quickly.

The gas and the reaction particles thus introduced into the upper section 1b form an upper fluidized bed 8b in the upper section 1b of the reaction tower 1. In the upper fluidized bed 8b, the lower fluidized bed 8
Similarly to a, the gas is further desulfurized by the solid-gas contact between the reaction particles of the desulfurizing agent and the gas containing sulfur.

The gas desulfurized in the upper fluidized bed 8b of the upper section 1b is discharged from the top of the upper section 1b, sent to a subsequent processing facility (not shown), used for power generation and the like, and then discharged to the atmosphere. Is done.

On the other hand, the reaction particles in the upper section 1b merge with the regenerated desulfurizing agent introduced from the desulfurizing agent inlet 6, and when the height thereof reaches a certain horizontal level, it overflows as described above. It is transferred to the lower part 1a via the pipe 7, and the above-mentioned process is repeated.

In this embodiment, the desulfurizing agent from the regeneration tower is introduced into the upper section 1b of the tower body 1 and sent from the lower section 1a to the regeneration tower. The desulfurizing agent from the tower may be introduced into the lower section 1a and blown up to the upper section 1b, and the sulfurized desulfurizing agent may be sent from the upper section 1b to the regeneration tower.

In this case, it is needless to say that the desulfurizing agent inlet 6 is provided in the lower part 1a and the desulfurizing agent outlet 5 is provided in the upper part 1b. In the case of this configuration, there is an advantage that a fresh desulfurizing agent can be brought into solid-gas contact with an untreated gas having a high sulfur content by introducing the regenerated desulfurizing agent into the lower portion 1a.

In the present embodiment, a configuration in which the reaction tower is divided into upper and lower stages has been described, but the present invention can be similarly applied to a reaction tower having more stages. Of course, In such a case, an overflow pipe for flowing the upper desulfurizing agent particles down to the lower stage and an airflow conveying tube for carrying the lower desulfurizing agent particles to the upper fluidized bed by a fluidizing gas are provided by connecting the respective stages.

In short, according to the present invention, according to the present invention, the reaction tower of the desulfurization apparatus is formed in multiple stages, and the respective stages are connected in order by an air flow conveying pipe for conveying the desulfurizing agent particles in a gas flow, so that the sulfur-containing gas and Both of the desulfurizing agent-reactive particles can be simultaneously moved from the lower stage to the upper stage via the pneumatic conveying pipe. In other words, since the gas and the reaction particles moving from stage to stage can also perform solid-gas contact, that is, desulfurization, inside the airflow conveying pipe, the gas and the desulfurization agent are higher than the conventional reaction tower in which the gas and the desulfurizing agent do not come into contact when they are transferred from stage to stage. Desulfurization efficiency can be achieved and therefore
It is possible to make the reaction tower smaller than before.

[0030]

In summary, according to the fluidized bed reaction tower of the present invention, the reaction tower of the desulfurization apparatus is formed in multiple stages, and the respective stages are connected in order by an airflow pipe for airflow transport of the desulfurizing agent particles. Both the sulfur-containing gas and the desulfurizing agent-reactive particles can be simultaneously moved from the lower stage to the upper stage via the airflow pipe. In other words, since the gas and the reaction particles moving from stage to stage can also perform solid-gas contact, that is, desulfurization, inside the airflow conveying pipe, the gas and the desulfurization agent are higher than the conventional reaction tower in which the gas and the desulfurizing agent do not come into contact when they are transferred from stage to stage. The desulfurization efficiency can be achieved, and therefore, the size of the reaction tower can be reduced as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a fluidized bed reactor according to the present invention.

FIG. 2 is a partially enlarged view of the fluidized bed reaction tower of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tower main body 1a (tower) lower part 1b (tower) upper part 4 Air flow conveyance pipe 7 Overflow pipe 8a Lower fluidized bed 8b Upper fluidized bed

Claims (2)

[Claims] In a fluidized bed reaction tower for removing sulfur from a gasified gas obtained by gasifying a fuel such as coal with a desulfurizing agent, a multistage fluidized bed is formed in the tower body, and the upper desulfurizing agent particles are formed in a lower stage. An overflow pipe is provided to allow the gas to flow down into the upper fluidized bed, and an airflow transport pipe is provided to carry the airflow with the fluidizing gas to the upper fluidized bed. A fluidized bed reactor that removes sulfur with a desulfurizing agent. 2. The fluidized bed reactor according to claim 1, wherein a nozzle for flowing an airflow in a radial direction is formed at an upper end of the airflow transport pipe.