DD287831A7 - DEVICE FOR COMBINED TREATMENT OF TRUEBES - Google Patents

Abstract

The invention is particularly used in flue gas washers for small and medium boiler units are used which are often gergeruestet and need for space reasons a gedraengten construction. According to the invention, the processing basin is divided into three functional areas, with the functional area connected to the nasalizer outlet having one or more funnel-like depressions in the bottom and extending from the top 5-20 cm into the trough, across the pool width, to retain scum and foam the second area is separated from the first by a partition wall led from the bottom to 5-25 cm below the liquid surface and thus flowed from above, has a gutter extending across the pool for equal addition of additive, and the third area, from second partitioned by an adjustable in inclination to the vertical in the range of 5-35 degrees, open at the bottom partition, has an upwardly Groeszer expectant cross-section. FIG {Rauchgaswaesche; small boiler units; Truebebecken; additive; Scum; Naszabscheider}

Description

Field of application of the invention

In the combined deposition of dust and noxious gas in Naßabscheidern fall to turbidity, which contain solids and react by registered substances acid or oasic. Since the constant removal of the slurry and its use by fresh water is only possible in a few cases and also uneconomical, the pulp is goführt in circulation, for which a device for the separation of the solids and for neutralization is required.

The invention is particularly used in flue gas scrubbing for smaller and medium-sized boiler units are used which are often retrofitted and require space reasons a crowded design.

Characteristic of the known technical solutions Sales Basin for Naßabscheiderabwässer are known. They are often built outdoors and built as large as possible to one

long operating time to ensure necessary decommissioning and clearing. The aim is low

Flow rates, so that the sedimentation of solids can go undisturbed. The disadvantage is the installation, or building in concrete construction outdoors, there when decommissioning of the system Risk of freezing exists. Also made are so-called lamellar heels, which contain complicated installations and the mud over Carry KraUband out. These are particularly suitable for coarse dusts in foundries. Machteilig are the high cost of such Facilities and the volume of construction as well as the complex maintenance and cleaning work. An enrichment of the pulp with

Rust and the removal of this thin sludge was purchased especially at the flue gas cleaning with too much effort, one also includes the necessary corrosion protection measures in the considerations with a.

It is also possible to design cloudy pools as so-called lap thickeners. To be able to remove the mud, is

the bottom of these basins freed from the sediment by differently designed scratches. Due to their round design, these devices, which are set up as basins in the floor or as an apparatus over a corridor, can only be reduced to a compact one

Integrate flue gas desulphurisation system. Moving installation sound are also costly. All said apparatuses have in common that they are for the supply of soluble solid additives for the neutralization of Umlauftribe own no specially trained areas. For example, when milk of lime is added, the undissolved particles settle in the pulp with the other solids

and there are losses of additive, since this is removed with the solids from the process. (See "wet workers

Staubabscheider ", Vulkan-Verlag, Essen 1983). Object of the invention

The aim of the invention is to provide a device for combined turbidity treatment, which allows the reduction of the solids content of the pulp, the feeding and dissolving of additive and optionally the oxidation of sulfite to sulfate and which are good in flue gas desulphurisation plants, for example by placing the Wet separator, integrate.

Explanation of the essence of the invention

The invention has for its object to provide an apparatus for solids separation and enrichment in circulating turbidity of Naßabscheidern, which ensures a good mixing of the additive and its sufficient residence time for the Lösungspro ^ Eß, without it by the precipitation of solid additive With the remaining turbid solids, losses of additive can occur and, if necessary, the oxidation of sulfite to sulfate is possible.

According to the invention, the object is achieved in that a cloudy pool is divided into three areas. In the first area, of

the flow coming from the Naßabschoider is the flow over the cross section of the basin to

Sedlmentioren the solids undisturbed and is at speeds below 0.6m / mln. The bottom of the pool has one or

several funnels for collection and removal of the forming thin sludge.

Dive into the surface to retain the possibly forming foam and scum one or two Trace 5 ... 25cm deep over the rhyming pelvic width. If necessary, in the inflow of the Naßabscheider

An impoverished air will be placed next turbid, whereby an oxidation of sulfite to sulfate is achieved. These

Design is particularly advantageous because the injected air is distributed in bubble form with the flow in the basin. The second area is divided from the first by a partition located at the bottom, which is 5 ... 25cm below the Liquid surface is enough. As a result, this area is flowed from above, with one over the pool width going Gutter in the overflow principle, the distribution of the additive takes over. The evenly mixed with the circulating pulp and fed in the DC down additive has sufficient time for the Solving process. In the case of a sparingly soluble additive, the supply of compressed air or liquid from below may still cause

better mixing and greater turbulence in the second area can be achieved.

It is also possible to intensify the dissolution process in this area using a stirrer. Finally, the third region is separated from the pristine by a sloping wall, which is inclined towards the vertical

adjustable in the range of 5 ... 35 ° and open at the bottom, which causes its cross-section from bottom to top increases.

Due to the turbidity flowing in the bottom area, all undissolved additive particles are entrained. These are dissolved "Jn

finally, because the particles are held in suspension in the third area. Insoluble additive impurities are retained and do not pollute the pulp circulation.

This design of the cloudy basin results in the surprising effect of the extensive solution of the solid additive

in the cloudy and thus the perfect utilization of its neutralization capacity. Losses due to the additive particles discharged with the solids could no longer be detected. In addition, there was a considerable improvement in the pH control behavior of the plant.

embodiment The invention will be explained below by way of example. The accompanying drawing shows the design of a Device for combined treatment, d. H. to reduce the solids concentration and to neutralize Circulating pulp in a flue gas desulphurisation plant. The turbid laden with pollutants enters via a Einströmstutzen 1 or the attached Naßabscheider 2 in

3. Due to the undisturbed flow, thin sludge settles in the funnels 4 and can be withdrawn via the nozzles 5 at certain time intervals. Into the surface this. «; Pool area dip the plates 6 to retain the possibly forming foam and scum. With a free tank cross-section of 1.8m ² , circulating amounts of turbidity up to 65m ³ / h can be treated.

The liberated from solids pulp passes above the partition wall 7 in the second area, with the aid of the channel 8 via the

entire width of the pool as needed, d. H. in accordance with the automatic measurement and regulation of the pH,

Additive is supplied. An intensification of the mixing and dissolving process is in the example by supplying air at Compressed air connection 9 possible. Due to the higher residence time of the additive in the second region, for example, it comes opposite

the previous practice, the supply of the additive at the intake of the pelvis to a more favorable control behavior of the

Plant in terms of pH. Insoluble constituents of the additive can be withdrawn at the nozzle 10 after a longer period of operation. By the inclination

the bottom open partition 11 to the left, the vertical flow rate to the surface of the Jritton range is systematically reduced, whereby the entrained from the second region of additive particles in a limbo state and can solve completely by the larger residence time.

The extraction of the treated pulp takes place at the suction point 12 either via nozzles or with the aid of submersible pumps,

whereby over the Beckenbroite also two or more nozzles or pumps can be distributed.

Claims (1)

Device of combined turbidity treatment in particular used for flue gas cleaning Naßabscheidern, wherein for cloud conditioning additives in the form of poorly soluble neutralizing agents, in particular hydrated lime, are used, characterized in that it is a cloudy pool, which is divided into three functional areas, with the Naßabscheider-drain associated functional area has one or more funnel-like depressions in the bottom and that from the top 5-20cm immersed in the pulp, extending over the jaw width plates are mounted, that the second area by a guided from the bottom to 5-25cm below the liquid surface partition is separated from the first and containing a groove across the width of the jaw for uniform application of additive and that the third region of the second by an adjustable in the inclination to the vertical in the range of 5-35 degrees, downwardly open partition a is divided and has an upwardly increasing cross-section. For this 1 page drawing