JPH10235144A - Utilization of desulfurizing agent reaction particles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize reaction particles of a powdered desulfurizing agent separated by the dust extracting filter of a fluidized bed dry dusulfurization apparatus. SOLUTION: Particles of a desulfurizing agent being reactive particles used in desulfurization reaction are utilized in a fluidized bed dry desulfurization apparatus. In this case, the reactive particles recovered by the filter 3 of the rear stage of a reaction tower 1 for desulfurizing formed gas containing a sulfur component are introduced into a regeneration tower 2 regenerating the desulfurizing agent used in desulfurization to be utilized while the reactive particles recovered by the filter 4 of the rear stage of the regeneration tower 2 are introduced into the reaction tower 1 to be utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for utilizing desulfurizing agent particles used in a desulfurization reaction in a fluidized bed dry desulfurization apparatus, that is, a method for using reaction particles. A method in which a desulfurizing agent is used in a regeneration tower for regenerating, and, on the other hand, particles of the desulfurizing agent used in the desulfurization reaction, that is, the reaction particles are used in a fluidized bed dry desulfurization apparatus in which the reaction particles recovered in a later stage of the regeneration tower are used in the reaction tower. About.

[0002]

2. Description of the Related Art In a combined gasification combined cycle power generation system in which a fuel such as coal is gasified to generate a high-temperature product gas and the generated gas is used for power generation, a desulfurization apparatus is used to remove sulfur contained in the generated product gas. Is provided.

A fluidized bed dry desulfurization apparatus (see FIG. 2) as one of such desulfurization apparatuses introduces a sulfur content in a produced gas into a reaction column 1 and a dry desulfurization agent is supplied through a fluidized bed of the reaction column 1. To absorb and remove the sulfur content in the product gas,
The desulfurization agent which has been sulfurized by the desulfurization reaction in step 1 and has a reduced desulfurization effect is sent to the regeneration tower 2 and is regenerated using a regeneration gas such as oxidized air, and the regenerated desulfurization agent is returned to the reaction tower 1 for desulfurization. It is a device that is used for recycling.

[0004] As shown in FIG. 2, a first filter for removing dust (pulverized desulfurizing agent or the like) contained in the desulfurized purified gas discharged from the reaction tower 1 is provided downstream of the reaction tower 1. 3, and the purified gas passes through the first filter 3, and is disposed at a later stage of processing equipment (not shown) (such as a gas turbine).
Sent to On the other hand, a second filter 4 for removing dust such as a powdered desulfurizing agent contained in a gas (regeneration gas) containing a large amount of sulfur discharged from the regeneration tower 2 is connected to a stage subsequent to the regeneration tower 2, The regenerated gas is sent to equipment (not shown) (not shown) at a subsequent stage through the second filter 4.

That is, the powdered desulfurizing agent, ie, the powdered reaction particles, contained in the purified gas is captured by the first filter 3, and the powdered desulfurizing agent, ie, the powdered reaction particles, contained in the regenerated gas. Is captured by the second filter 4.

[0006]

As described above, most of the dust captured by each of the dedusting filters at the latter stage of the reaction tower and the latter stage of the regeneration tower is reaction particles of a powdered desulfurizing agent,
It has been found that the powdery desulfurizing agent-reactive particles have a relatively high desulfurizing capacity, that is, they can be reused. However, in the conventional fluidized-bed dry desulfurization apparatus, the powdery desulfurizing agent reaction particles captured by the dust filter are often discarded, and there has been a problem that their effective use has not been achieved.

Accordingly, an object of the present invention is to provide a method for effectively utilizing the reaction particles of a powdered desulfurizing agent separated by a dust filter of a fluidized bed dry desulfurization apparatus.

[0008]

Means for Solving the Problems To achieve the above object, the invention of claim 1 provides a method for utilizing desulfurizing agent particles which are reaction particles used in a desulfurization reaction in a fluidized bed dry desulfurization apparatus. The reaction particles recovered by the filter at the subsequent stage of the reaction tower for desulfurizing the product gas containing the gas are introduced into the regeneration tower for regenerating the sulfided desulfurizing agent and used, while the reaction particles are recovered by the filter at the latter stage of the regeneration tower. The reaction particles are configured to be introduced into the reaction tower and used.

[0009]

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

FIG. 1 is a schematic system diagram of a fluidized-bed dry desulfurization apparatus for realizing a method of using reaction particles (particles of a desulfurizing agent used in a desulfurization reaction) in the fluidized-bed dry desulfurization apparatus of the present invention. I have.

In the figure, reference numeral 1 denotes a product containing sulfur (crude)
This is a known reaction tower for desulfurizing gas using a dry desulfurization agent in a fluidized bed, and corresponds to the reaction tower 1 in FIG. Reference numeral 2 denotes a regeneration tower 2 that regenerates a desulfurizing agent sulfided by the desulfurization reaction in the reaction tower 1 with a regeneration gas such as regeneration air.
Is equivalent to

In FIG. 1, a first filter 3 for removing dust (pulverized desulfurizing agent, etc.) contained in the desulfurized purified gas discharged from the reaction tower 1 is provided at a subsequent stage of the reaction tower 1.
A second filter 4 for removing dust (pulverized desulfurizing agent or the like) in the regeneration gas discharged from the regeneration tower 2 is connected to a stage subsequent to the regeneration tower 2. The first filter 3 and the second filter 4 in FIG. 1 also correspond to the first filter 3 and the second filter 4 in FIG. 2, respectively.

Although not shown, the reaction column 1 shown in FIG.
And the regeneration tower 2 converts the sulfurized desulfurizing agent of the reaction tower 1 to the regeneration tower 2
And a separate transfer line for transferring the regenerated desulfurizing agent from the regeneration tower 2 to the reaction tower 1 (see FIG. 2).

As shown in FIG. 1, the first filter 3
Is connected to an appropriate position in front of the regeneration tower 2 via a first dust transfer line 5, and the dust (mainly a powdered desulfurizing agent) collected by the first filter 3 is The first dust transfer line 5 is configured to be introduced into the regeneration tower 2.

On the other hand, the dust outlet of the second filter 4 is connected to an appropriate position in front of the reaction tower 1 via a second dust transfer line 6, and the dust collected by the second filter 4 ( The second dust transfer line 6 mainly introduces a powdered desulfurizing agent into the reaction tower 1.

The product gas obtained by gasifying a fuel such as pulverized coal is
The gas (purified gas) introduced into the reaction tower 1 and desulfurized by a dry desulfurizing agent in the fluidized bed thereof,
Is sent to the subsequent processing equipment (not shown) through the filter 3 and is used for power generation and the like.

At this time, dust (mainly powdered desulfurizing agent) contained in the purified gas is separated from the purified gas by the first filter 3, and the separated dust is passed through the first dust transfer line 5. It is introduced into the former stage of the regeneration tower 2 and is regenerated by the regeneration tower 2.

On the other hand, the desulfurizing agent which is sulfurized due to the desulfurization reaction in the reaction tower 1 and has a reduced desulfurization effect is sent to the regeneration tower 2 and regenerated by a regeneration gas such as oxidized air. Is returned to the reaction tower 1 and used for desulfurization. The gas containing a large amount of sulfur (regenerated gas) discharged from the regenerator 2 is sent to the subsequent processing equipment (not shown, such as a wet desulfurizer) through the second filter 4 and is appropriately processed. You.

At this time, dust (mainly powdered desulfurizing agent) contained in the regeneration gas is separated from the regeneration gas by the second filter 4, and the separated dust is passed through the second dust transfer line 6. It is introduced into the preceding stage of the reaction tower 1 and is reused in the reaction tower 1 for desulfurization. Thereafter, this process is repeated, and the desulfurizing agent is recycled.

In the present embodiment, the dust recovered from the regeneration gas by the second filter 4 is introduced into the reaction tower 1, and the reaction particles of the desulfurizing agent contained in the dust are This is because the fine particles are finer than the reaction particles of the desulfurizing agent contained in the dust recovered from the purified gas by the first filter 3, and therefore can exhibit a higher desulfurization effect and are more suitable for use in the reaction tower 1.

In summary, according to the present invention, in the present invention, the reaction particles of the powdered desulfurizing agent discharged together with the gas from the reaction tower and the regeneration tower of the fluidized bed dry desulfurization apparatus are collected by the filter, and are again recovered. The desulfurizing agent-reacted particles can be used more effectively.

[0022]

As described above, in summary, in the method of using the desulfurizing agent reaction particles according to the present invention, the powdered desulfurizing agent reaction particles discharged together with the gas from the reaction tower and the regeneration tower of the fluidized bed dry desulfurization apparatus are used. Since the particles are recovered by the filter and sent to the regeneration tower and the reaction tower again for reuse, the desulfurizing agent reaction particles can be more effectively used.

[Brief description of the drawings]

FIG. 1 is a partial schematic view showing a fluidized bed dry desulfurization apparatus for realizing a method for utilizing desulfurizing agent reaction particles of the present invention.

FIG. 2 is a partial schematic view showing a conventional fluidized bed dry desulfurization apparatus.

[Explanation of symbols]

 Reference Signs List 1 reaction tower 2 regeneration tower 3 (first) filter 4 (second) filter

Claims (1)

[Claims] 1. A method utilizing a desulfurizing agent particle, which is a reaction particle used in a desulfurization reaction in a fluidized bed dry desulfurization apparatus, wherein a reaction recovered by a filter at a subsequent stage of a reaction tower for desulfurizing a product gas containing sulfur. The particles are introduced and used in a regeneration tower that regenerates the sulfided desulfurizing agent, while the reaction particles recovered by a filter at a later stage of the regeneration tower are introduced and used in the reaction tower. A method using particles of a desulfurizing agent, which is a reaction particle used in a desulfurization reaction in a fluidized bed dry desulfurization apparatus.