JP2532429Y2 - Dry desulfurization equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry desulfurization apparatus for desulfurizing a gas to be treated such as a coal gasification gas with a desulfurizing agent and regenerating the desulfurizing agent with a regeneration gas.

[0002]

2. Description of the Related Art In general, coal gasification gas and the like contain sulfur, such as hydrogen sulfide, as an impurity. Therefore, from the viewpoint of preventing environmental pollution, it is necessary to remove sulfur, such as hydrogen sulfide, in the purification process. It has been done.

[0003] As a method for removing the sulfur content, a fixed-bed dry desulfurization apparatus is known. In this dry desulfurization apparatus, a gas to be treated such as a coal gasification gas is brought into contact with a honeycomb-shaped desulfurizing agent contained in a container. For desulfurization.

[0004]

In the above-mentioned dry desulfurization apparatus, when regenerating a desulfurizing agent, a regenerating gas of about 400 to 500 ° C. containing oxygen is supplied into the desulfurizing vessel to regenerate the desulfurizing agent at a predetermined temperature ( For example, when iron oxide is used as the desulfurizing agent,
However, the desulfurizing agent is gradually regenerated from the upstream side to the downstream side along the flow of the regeneration gas, so that the temperature increases toward the upstream side, and the downstream side increases. It causes too much trouble such as sintering. Further, if the temperature of the regeneration gas is lowered so that the temperature on the downstream side becomes the predetermined temperature, the temperature on the upstream side becomes low and the desulfurizing agent cannot be sufficiently regenerated. Therefore, unless the desulfurizing agent is cooled while regenerating the desulfurizing agent by flowing a large amount of the regenerating gas or the oxygen concentration in the regenerating gas is not reduced, the inside of the container cannot be maintained at a predetermined temperature, and Is difficult to control.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a dry desulfurization apparatus which can easily regenerate a desulfurizing agent.

[0006]

According to the present invention, in order to achieve the above object, a desulfurizing agent accommodated in a desulfurization vessel is brought into contact with a gas to be treated, and the desulfurization treatment is carried out. In a dry desulfurization apparatus for regenerating a desulfurizing agent by introducing a gas, a desulfurizing agent is laminated on the desulfurizing vessel with a predetermined gap therebetween, and a blowing port for blowing a regenerating gas into the gap is provided.

[0007]

The desulfurizing agent layer is formed by laminating the desulfurizing agent, and the desulfurizing agent layer is separated by a predetermined gap to form a desulfurizing agent layer divided by the gap. Since the openings for blowing the regeneration gas are provided in those gaps, the divided desulfurization agent layers are respectively regenerated by the regeneration gas from the inlets of the gaps. Therefore, since the desulfurizing agent layer is divided and regenerated, the temperature on the downstream side of the regenerating gas does not become abnormally high, so that the desulfurizing agent can be easily regenerated.

[0008]

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

In FIG. 1, reference numeral 1 denotes a desulfurization vessel for desulfurizing a gas to be treated such as a coal gasification gas containing sulfur such as hydrogen sulfide.

[0010] The desulfurization vessel 1 is formed in a cylindrical shape, and the temperature in the vessel 1 is maintained at about 300 to 500 ° C or about 600 to 750 ° C. A gas conduit 3 having an on-off valve 2 is connected to an upper part of the desulfurization vessel 1, and a processing gas pipe 5 having an on-off valve 4 is connected to a lower part thereof. Further, a flat desulfurizing agent 6 is laminated in the desulfurizing vessel 1, and a gas to be treated such as coal gasification gas enters the vessel 1 from the gas conduit 3 and contacts the desulfurizing agent 6 to be desulfurized. ,
The gas flows out to the processing gas pipe 5.

As shown in FIGS. 2 and 3, the desulfurizing agent 6
A heat-resistant material such as titanium oxide or silicon oxide is used as a substrate, and a metal oxide such as iron oxide or zinc oxide is mixed with the substrate. Or 3 to 10 mm thick circles
It is formed in a divided plate shape and has a diameter (φ)
A plurality of holes 7 of about 3 to 10 mm are regularly arranged. In addition, a spacer 8 having a height of 5 to 20 mm is attached to a lower portion of the desulfurizing agent 6 so that there is a gap between the desulfurizing agents 6 when the desulfurizing agent 6 is laminated.

Further, as shown in FIG. 1, the desulfurization container 1 has a plurality of gas inlets 9 (shown in the drawing) for blowing gas substantially uniformly at predetermined intervals along the height direction. In this case, four grids 10 are disposed, and the desulfurizing agent 6 is stacked on these grids 10 so that the holes 7 of the adjacent desulfurizing agents 6 do not coincide with each other. The agent 6 is laminated and the desulfurizing agent layer 11
Is formed. Each grid 10 has a control valve 12.
regeneration gas pipe 13 having a, 12b, 12c, 12d
The regeneration gas pipes 13a, 13b, 13c, and 13d are connected to the distributor 14, respectively. The distributor 14 has about 400 to
A regeneration gas supply pipe 15 for supplying a regeneration gas such as nitrogen containing oxygen at 500 ° C. is connected. Further, a regeneration gas exhaust pipe 17 having an on-off valve 16 is connected to the gas conduit 3.

Next, the operation of this embodiment will be described.

First, a predetermined number of flat desulfurizing agents 6, for example, of iron oxide type, are laminated on each grid 10 in the desulfurizing vessel 1 so that the holes 7 of the adjacent desulfurizing agents 6 do not coincide with each other. Is formed. In this case, since the spacer 8 is attached to the lower part of the desulfurizing agent 6, there is a gap between the desulfurizing agents 6. As described above, the holes 7 of the adjacent desulfurizing agents 6 do not coincide with each other, and a predetermined gap is opened between the desulfurizing agents 6, so that the surface area of the desulfurizing agent per unit volume is smaller than that of the conventional honeycomb-shaped desulfurizing agent. Since it becomes large, the contact efficiency between the desulfurizing agent 6 and the gas is improved. In addition, since the desulfurizing agent 6 has a flat shape, the grid 10 can be easily arranged.

Then, a gas to be treated such as a coal gasification gas is introduced into the desulfurization vessel 1 through a gas conduit 3. The gas that has entered the vessel 1 is desulfurized by contact with an iron oxide-based desulfurizing agent 6 at a high temperature (about 300 to 500 ° C.), and then flows out to a processing gas pipe 5, and then is used as a fuel for a gas turbine or the like. used.

The valve is switched before the desulfurization performance of the container 1 is reduced. That is, the on-off valves 2 and 4 of the gas conduit 3 and the processing gas pipe 5 are closed, and the regeneration gas pipes 13a and 1
Control valves 12a, 12b, 12 of 3b, 13c, 13d
c, 12d and the on-off valve 16 of the regeneration gas discharge pipe 17 are opened. As a result, the regeneration gas containing oxygen is supplied from the regeneration gas supply pipe 15 through the distributor 14 to each of the regeneration gas pipes 13a, 13a.
It is distributed to 3b, 13c, 13d, and is blown into the container 1 from the blowing port 9 of each grid 10. The injected regeneration gas flows in the opposite direction to the gas to be treated and has a high temperature (about 600 to 750
C) and reacts with the desulfurizing agent 6 to regenerate the desulfurizing agent 6. In this case, since the plurality of grids 10 are provided in the height direction of the desulfurizing agent layer 11, the desulfurizing agent layer 11 is divided by the grids 10, and each time the division is performed, the regeneration gas from each grid 10 causes the vicinity of the grid 10 Will be played back gradually. In order to continuously desulfurize the gas to be treated by using the desulfurization vessel, a plurality of the desulfurization vessels are arranged in parallel, and the gas is desulfurized in order by switching a valve. Make it play.

Therefore, by providing a plurality of grids 10 in the desulfurization vessel 1 and supplying a regeneration gas to the grids 10, the desulfurization agent layer 11 is divided into a plurality of parts and each part is regenerated. The temperature on the downstream side of the agent layer 11 does not become too high. Therefore, it is sufficient to supply the regeneration gas at about 400 to 500 ° C. without flowing the regeneration gas in a large amount or reducing the oxygen concentration contained in the regeneration gas, so that the desulfurizing agent 6 can be easily regenerated. Will be. Moreover, since the desulfurizing agent layer 11 is divided into a plurality of parts and regenerated, the regeneration temperature can be easily controlled.

[0018]

In summary, according to the present invention, the desulfurization vessel is laminated with a predetermined gap in the desulfurization vessel, and a blowing port for blowing the regeneration gas is provided in the gap, so that the desulfurization agent can be easily regenerated. It has an excellent effect of being able to do it.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing an example of the desulfurizing agent of the present invention.

FIG. 3 is a view taken along line AA in FIG. 2;

[Explanation of symbols]

 1 desulfurization vessel 9 blow port

Claims (1)

(57) [Scope of request for utility model registration] 1. A dry desulfurization apparatus for regenerating a desulfurizing agent by bringing a desulfurizing agent housed in a desulfurizing container into contact with a gas to be treated to perform desulfurizing treatment and introducing a regeneration gas into the desulfurized container to regenerate the desulfurizing agent. A dry desulfurization apparatus characterized in that a desulfurization agent is laminated on a desulfurization container with a predetermined gap therebetween, and an inlet for blowing a regeneration gas is provided in the gap.