SE411068C - PROCEDURE FOR REMOVAL OF DUST COATING IN HEAT EXCHANGER - Google Patents

Description

Or intermittently, in a manner known per se from one or more typhoons for sound stringing or other 1-judo generators, placed at the height of the tubes, and that the sandweller has another solid powdery or granular matter with larger grains. size than that of the dust, at least at the same time as the sound generation, possibly also before this, is introduced into the chamber or pipe for passage together with the gas, whereby the sand etc. together with the dust settles at least in part. the outer surfaces of the tubes and by means of sound sooting together with the dust detach from the tubes and 'cort form Only sound sooting does not work sufficiently. the fine substance in the gas, but by the addition of sand or other coarser matter than the dust, the dust and the sand together will settle on the tubes and more or less torque-ant will be.- released from them by the sound, whereby the sand etc will act . as activator.

The dust is thus decomposed (from the gas) and the composite composition * sand plus dust comes off more easily during sounding.

The sand input and sound generation can take place continuously or intermittently at a rate, depending on the composition of the dust, and possibly the sand input can start slightly before the sound flow, but in other cases this is not necessary.

The coolant, such as the water in the tubes, is converted to steam, suitably for use in a steam boiler or for other heating purposes, and the gas to be purified may be, for example, combustion gases from a furnace.

Typhoonzaa can of course be replaced by other sound generators, and the sound frequency will be around 390-500 Hz. The average grain size of the dust is 0.1-1 μm, and the sand etc should be given an average grain size of 0.54 mm ø, preferably 1-2 ml.

The invention is further exemplified in the accompanying sketch which shows a heat exchanger, intended for the method according to the invention.

An heat exchanger is illustrated here intended for cooling dust-contaminated gas, incoming at arrow 1, and possible heat recovery. The gas is blown into a chamber or a pipe 2, inside which are drawn tubes 3 with cooling medium, such as water. On. tubernss 3 outer surfaces, the dust from the gas must be deposited and purified. late sqm gas: can leave vämevarimn (at 4).

The problem used to be that the dust got stuck too well on the tubers 3 and could not be disposed of. easy way. 10 15 20 25 30 '78041121' -1 at the wall of the pipe or lcsmaren 2 are arranged on. known manner one or more typhoons 5 or others. sound generator with a sound frequency of about 300-500 Hz. These typhoons are suitably placed at or approximately at the height of the tubes 3. At 6, sand or other powdery or granular material is introduced with an average cometic sv 0.54 m ø, preferably 1-2 m ø, of essential: larger than started average grain size 0.1-1, 0 / 1m.

The sand etc is meant to be mixed with the gas and blown through the heat exchanger ooh settles with the dust in the gas on. the tubes 5. By acting as an activator, the dust plus the sand is released during the sound sooting, and this can, like the sandinmatnizlgen, occur continuously or intermittently at a rate, depending on the nature of the substance.

The material detached from the tubes is passed with the gas to a filter (not shown), which separates the dust from the gas. The filter is allowed to operate at a temperature suitable for the life of the filter by cooling the gas.

The water in the tubes. Is converted to steam, which can be used for a steam mill, and the gas to be purified and cooled in the heat exchanger can be exhaust gas from an oven. It saw. the gas purified in the heat exchanger and filter can then be reused for combustion purposes, utilizing its heat content.

The number of nozzles for sandblasting is one or more, and the gas circulation can be forced in all sorts of ways known in the art.

The method according to the invention is carried out as follows: Dust-mixed gas from, for example, a ferro-silicon gas is blown in at 1, and inter-middle or continuous: Sand etc. is blown in at 6, the sand is mixed with the gas, and dust plus sand settles on the outer surfaces of the tubes. the gas is cooled, and the 3 coolant of the tubes is heated.

Sound is generated, in each case at the same time as the sand blending, from high-power typhoons 5, with the coating on. the outer surfaces of the tubes come loose and are removed with the gas (at 4) to one or more filters (not shown), where dust plus sand may be separated. The grain size, the frequency from the sound tightness and the dust particle size as above.

The method according to the invention can be varied within the scope of the following claims.

Claims (3)

780442131 PATENTHAV A method of removing dust coating in heat exchangers, wherein dust containing ash passes in a single tube or in a chamber containing tubes of refrigerant, characterized in that the sound is generated, continuously or intensely. in ooh known manner from one or more sound generators (S), placed at the height of the tubes (S), true that sand or other solid powder or granular matter with a larger grain size than the dust (6) at least simultaneously with the Uudalstringen, possibly also before this, is inserted into the camera (2) or the tube for passage together with the gas, whereby the sand etc. together down the dust at least partially settles on the outer surfaces of the tube (5) and by gentle sooting together with the dust detaches from the tube and abducted. 2. A method according to patent claim 1, characterized in that sand or powder or granular material with an average grain size of 05-3 mm d, preferably 1-2 mm 95, is introduced into the gas, the dust having a average grain size of 0.1-1 / nm. 3. method according to pstentmven 1-2, x a n n e z e c k n s t aan-sv, a sound sooting is performed with a frequency of about 500-500 Hz. MENTIONED PUBLICATIONS: