JPS5867322A - Treatment of powdery dust in dry type desulfurization apparatus - Google Patents

Abstract

PURPOSE:To treat all the powdery dust produced in each process together by treating an SOx contg. gas in an adsorbing tower together with the dust produced from both of a regenerating process for the adsorbent and a sulfur recovery process from a gas contg. highly concd. SOx produced from the regeneration process. CONSTITUTION:Waste gas from a boiler 11 contg. SOx is fed to an adsorbing tower 13 with a fan 12 to remove SOx, and cleaned in a dust collector 18. At that time, the dust produced in both of a regeneration process for reactivating activated carbon 16 used for the adsorbing tower 13, and the dust produced in a reactor 25 for reducing highly concd. SOx produced in the regenerator 18 to recover S from the gas, are sent to the dust collector 14 through ducts 22, and 29, respectively to treat these dusts together with the adsorbing dust produced in the tower 13, thus permitting all the processes to he simplified and made advantageous in economy and operability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating dust generated in a dry desulfurization apparatus.

A dry desulfurization method is widely used as a method for treating exhaust gas generated from fixed sources such as Zeiler. In this method, exhaust gas is treated with an adsorbent such as activated carbon in an adsorption tower, then treated with a dust collector, and the purified exhaust gas is exhausted from a chimney (hereinafter, this process is referred to as the main process). Then, the activated carbon that has lost its adsorption capacity is activated and
It generally involves a regeneration step to regenerate and a step to recover sulfur from the highly concentrated SO2-containing gas produced in this regeneration step (hereinafter referred to as ancillary processes).

Dust is also generated in ancillary processes and must be disposed of, but conventionally this dust has been disposed of by providing a separate dust collector. For example, dust is collected in two stages, a cyclone and a bag filter, and the treated exhaust gas is carried into the main treatment system or discharged outside the system by a separate discharge system.

However, installing separate dust collectors, dust treatment systems, and flue gas treatment systems is difficult due to installation space, economy,
Since this is disadvantageous in terms of operability, it should be avoided.

The inventor of the present invention made extensive studies to solve the above problems, and found that the dust generated from the ancillary processes is similar to the dust to be treated in the main process in terms of gas conditions, dust properties, etc., and that these dusts are concentrated. Discovering things that can be processed all at once □
Ta.

That is, in the method for treating dust in dry desulfurization of the present invention, when SOx-containing gas is treated in an adsorption tower and then treated in a dust collector, the adsorbent in the adsorption tower is regenerated or further in this regeneration step. The dust generated in the process of recovering sulfur from the gas containing high concentration SOx is collected in the collection FJJ4.
It is characterized by being processed simultaneously in a container.

FIG. 1 is a flow sheet showing an example of implementing the present invention.

The exhaust gas from the boiler 11 is sent to the adsorption tower 1 by the fan 12.
3, the exhaust gas is desulfurized by contact with activated carbon 16, and then treated and purified by a dust collector 14. The purified exhaust gas is discharged from a chimney 15.

In addition to the main processes mentioned above, dry membranes (+t) generally involve ancillary processes such as an activated carbon regeneration process and a carbon recovery process.

The activated carbon that has adsorbed Sol is conveyed to a regenerator 18 by a belt conveyor 17. A high-temperature purge gas is introduced into the generator 18 from the furnace 19 through a line 20 to cause Sox to be desorbed and the activated carbon to be regenerated. The regenerated activated carbon passes through a sieve 21 and is conveyed by a belt conveyor 22, and is used for desulfurizing exhaust gas. Further, the consumed amount of activated carbon is replenished from the storage tank 23.

On the other hand, JR-digas loaded with SOx at a high concentration is carried into the reduction reactor 25 via the line 24.

Coke is supplied to the reduction reactor 25 from a line 26, SOX is reduced, and a portion of it is recovered as sulfur in a condenser (not shown). The coke from the furnace 19 and the reduction reactor 25 is fed to the sieve 28 along with the coke from the make-up storage tank 27, and the coke is then fed to the furnace 19 and the reduction reactor 25 by a belt conveyor 29. The residual gas from which sulfur has been recovered is S02,
containing H2S2 and cos, this gas is in line 30
is fed to the Claus reactor 31, where all remaining sulfur content is recovered.

Incidental processes involve handling powdered materials such as activated carbon and coke, which generates dust, which must be disposed of. Dust is collected from, for example, a belt conveyor (A1 in the figure).
), is it a storage tank? (A2), from the sieve (Aa)
, generated from (A4) from the Claus reactor. Conventionally,
These dust particles have been treated in a neutralizer separate from the dust collector 14, but in the present invention, they are sent to the front stage of the dust collector 14 via a line 32 by a blower, and are treated together with the dust in the exhaust gas. As the dust collector 14, a filtration dust collector such as a bag filter or an electric dust collector is suitable from the viewpoint of stability and efficiency.

According to the present invention, the exhaust gas treatment system generated in the main process can be effectively used, and the system for treating dust generated in the ancillary processes can be omitted, simplifying the entire process, improving economy, labor saving, and operation. It is extremely advantageous in terms of sex.

Also, main pro 1! As a result, a dust collector designed with sufficient stability in mind will be used, making the process stable and reliable. Further, dust generation from the auxiliary processes is linked to the main process, and when the main process is stopped, there is no dust generation from the auxiliary processes. Therefore, regardless of whether the system is in operation or stopped, dust generated from the auxiliary processes is appropriately disposed of by the dust collector in the main process. In the conventional method, if the exhaust gas treatment system for an auxiliary process breaks down, the highly dust-containing gas will be directly discharged from the chimney of the main process, which means that the main process must be stopped. There may be cases where this is unavoidable.

[Brief explanation of drawings]

FIG. 1 is a flow sheet showing an example of implementing the present invention. 13... Adsorption tower 14... Dust collector 18... Regenerator 19... Furnace 21. 28... Sieve separator 25... Reduction reactor 31.
...Klaus reactor 6-

Claims (1)

[Claims] 1. When SOx-containing gas is treated in an adsorption tower and then in a precipitator, a regeneration process of the adsorbent in the adsorption tower or further removal of sulfur from the high-concentration SOx-containing gas generated in this regeneration process is performed. A method for processing dust in a dry desulfurization apparatus, characterized in that the dust generated in the recovery process is simultaneously processed in the dust collector.