CS272000B1 - A method of treating sludge wastewater from wet scrubbers and apparatus for its operation - Google Patents

Abstract

The aim of the method for treating suspended wastewater from wet scrubbers, resulting from the wet separation of the solid phase from gas, is to achieve a closed scrubbing circuit. Insoluble particles are separated from the suspended wastewater stream from the scrubbing and the cleaned wastewater is returned to the scrubbing. The method is carried out on a device where a separator, for example a lamellar settler or a centrifuge, is included after the wet scrubber and the auxiliary tank, which is connected to a clear water tank and a recirculation pump. The use of both devices enables the production of a highly concentrated concentrated salt solution from wet scrubbers by better utilizing the low-potential waste heat of dusty exhalations without the risk of clogging or clogging of the supply lines, nozzles and scrubber stages, which, in addition to increasing operational reliability, also creates the prerequisite for the emergence of waste-free technology at technological nodes for the removal of dusty exhalations from wet scrubbers.

Description

CS 272 000 B1

BACKGROUND OF THE INVENTION The present invention relates to a process for treating slurry effluent from wet asparagus scrubbers. In industrial practice, we often encounter the capture of dusty exhales of various kinds. Dust exhales are actually a mixture of a fine dust of a substance, or a mixture of mixtures / salts /, with air, respectively. with other gas / ddisik, argon, flue gas and the like /. So-called dry aeparators such as cyclones, weave filters, electrofilters, and the like, are used to roughly separate dust from the gas phase. If we want to catch all the dust, we have to use so-called wet separators, such as venturi-type washing machines, trays and so on.

Soft scrubbers work on the principle of direct contact of scrubbing water and / or solution with dusty exhalations. The disadvantage of wet scrubbers However, they produce a relatively large amount of so-called suepenzné waste, as a product of scrubbing. In order to minimize the amount of these scrubbers, most wet scrubbers have so-called internal recirculation, as a result of which part of the scrubbing water returning to sleep for scrubbing, and only part of it being discharged. suspension waters. If the scrubbed dust also contains insoluble salts or soluble, or is completely insoluble (e.g. the soot, ash / internal recirculation on the washing machine cannot be operated, or only to a small extent, that the insoluble solid phase contained in the recirculated solution entrains the feed hoses and the washing machine nozzles / in the venturi washers / or the storey racks thereby removing the washing machine from operation, which in addition must be laborious to read. From this d & partially soluble powders cannot be operated with so-called internal recirculation, as a result of which they wash the suspension solution and only to a small extent (3 - 10%), which makes it impossible to return to the process water, possibly to other uses, just the high water content, resp. low concentration. The thickened heat treatment is therefore unprofitable, therefore, in most of the slurry water, it is discharged into the channel. If the dust or salts washed out are harmful to health, but are valuable (such as in the case of dusty exhalations in the production of fertilizers), there is a double damage in the drainage of these waters by simply polluting the rivers and losing another valuable product. e.g. fertilizer /.

The aforementioned drawbacks are eliminated according to the invention, the essence of which is the wastewater effluent from wet scrubbers, in which the printed dust extracts are scraped with fresh water and / or a solution of fresh water and wash water from washing. the flow of the slurry water from the washing is sifted off the insoluble particles, preferably by centrifugation or eedimentation, and the purified water is returned to the wash. A device for design, consisting of a wet scrubber and an auxiliary reservoir is characterized by a continuous separator and a clear water reservoir being connected downstream of the auxiliary reservoir, which is connected to a circulation pump and an auxiliary reservoir with a wet scrubber.

Preferably, a continuous lamella settler and / or centrifuge is used as a continuous separator. As a result of the application of this method and apparatus, a highly thickened suspension solution is obtained, which is obtained by direct thickening on a washing machine, at the expense of a better utilization of low-potential waste heat of dust particles and subsequent separation on a continuous settler and / or centrifuge. The highly thickened suspension solution thus obtained can already be energetically thickened (low water content) and / or returned to the manufacturing process.

The new and higher effect of the process of treating slurry wastewater from wet scrubbers and apparatuses according to the invention consists in the possibility of obtaining a high-density suspension solution of salt from wet scrubbers, by better utilization of the self-propelled waste heat of dusty exhalations without the risk of clogging, respectively. clogging of supply lines, nozzles, and washing machine racks, in addition to increasing traffic - "-"

Claims (3)

CS 272 000 B1 2 oty security is a prerequisite for the emergence of waste-free technology for the washing of roast exhalations on wet scrubbers. FIG. 1 illustrates a method for treating slurry effluents from wet scrubbers and an apparatus for converting it to a thin line, the engagement of the present state of the art being drawn, the line of engagement of the present invention drawn. Dust Extracts 10 of industrial fertilizer entering from below into the wet scrubber are sprayed with recirculated clear water -from. a washing machine auxiliary tank 4 into which they are pumped through the container 2; the clear water, by means of a pump 5. After washing the scrubber 3, the scrubbing solution flows to sleep in a separate part of the scrubber tank 4, flowing into the separator 1, which is a continuous settler and / or centrifuge, without the so-called internal recirculation. in which the suspended particles, and in the form of a high-density suspension solution 9, are discharged into the wet production process of the fertilizer / granulator or reactor. The clear waters 7, flowing off by gravity from a continuous settler and / or centrifuge, are fed to a clear water reservoir 2 which also serves as a draft of the circulation pump 5. Another function of the reservoir 2 is that there is a water drop through the float valve. , the outgoing system in the form of vaporizer 11, on the washing machine 3. At the same time, the clear water reservoir 2 also serves as a cartridge. The circulating pump 5 is clear of the water 7, injected through the auxiliary holder 4 of the washing machine again on the washing machine 3. In case of dispensing a larger amount of clear solution by the circulation pump 5 into the separate part of the auxiliary tank 4 of the washing machine, overflow the separating wall over the separating wall into the second part, where he gets to sleep in the system, what. High flexibility and wastefulness of the slacking system is guaranteed. The wastage rate of wastes bounded by the maximum solubility of the salt can be adjusted by simply adjusting the position of the funnel overflow of the auxiliary tank 4 of the washing machine. The method of treating slurry wastewater from wet scrubbers and equipment can be used wherever dusty exudates are washed on wet scrubbers and where the resulting slurry waters contain other valuable salts, such as, for example, industrial fertilizer production. The dry system can be advantageously applied in the wet scrubbing of the fly ash and subsequent binding of SO 2 in the form of salt (CaSO 4, MgSO 4 ...) from the exhalations of the heating chimneys. These examples do not in any way limit the scope of the invention. SUBJECT OF THE INVENTION A process for treating slurry effluents from wet scrubbers, wherein the scrubbing dust extracts are sprayed with fresh water, and / or a fresh water and scrubbing water solution, characterized in that non-soluble particles are separated from the scrubbing water stream; preferably by centrifugation or sedimentation, and the purified water of the savraca, to sleep. 2. Apparatus for carrying out the method of step 1, comprising a wet scrubber and an auxiliary reservoir, characterized in that a continuous steam separator (1) and a clear water reservoir (2) are provided downstream of the auxiliary reservoir (4), which is connected via a circulation pump pump (5) and auxiliary tank (4) with wet scrubber (3). 3. Apparatus as claimed in claim 2, characterized in that a lamellar settler and / or centrifuge is used as the continuous separator (1). 1 drawing