SU1249088A1 - Method of trapping dust in drying unit of paper-making machine - Google Patents

Description

The invention relates to dusting methods, drying cylinders of thinning machines and intended for use in the manufacture of paper and cardboard. . five

The purpose of the invention is to increase the efficiency of the process.

According to the proposed method of dedusting drying cylinders of papermaking machines, which include wrapping the surfaces of the cylinders with a stream of compressed air and suction of dusty air, suction is carried out by water ejection at a vacuum of 10-15 mm of water, stationary water consumption 15 0-1.5 l / m and a pressure of 600,800 kPa. Vacuum is created by ejection of a mixture of water under pressure of 600-800 kPa, for example, in a Venturi scrubber. At the same time, a value of 20 per vacuum, optimal for the suction conditions of dusty air, is 10–15 mm of water, st. When the pressure of the irrigating fluid is less than 600 kPa, the vacuum does not provide a vacuum of 10-25 15 mm. Water. Art., and the vacuum at more than 800 kPa is not economically justified by the cost of energy.

Specific water consumption during ejection of dusty air in the selected interval of 1.0-1.5 l / m ensures effective regeneration of dust particles from the dusty air.

Conducting a suction of dusty air with water at a pressure of 600–8130 kPa 35 and a specific flow rate of 1.0–1.5 l / m ensures the contact of the sprayed liquid with dusty air and an effective mass transfer, as a result of which, due to inertial sedimentation, pischevye particles contained in the exhaust air. This makes it possible to regenerate the dusty air, which greatly increases the efficiency of the process of dedusting the drying cylinders.

The drawing shows a diagram explaining the proposed method.

When implementing the method, a scraper knife 1, a drying cylinder 2, a nozzle 3 of compressed air supply, a suction nozzle 4, a mixing tube 5 of an ejector Venturi scrubber, a nozzle 6, a drop catcher 7, a tank 8 and a pump 9 are used.

The dusting of the drying cylinder is as follows.

The scraper blade 1 removes particles of fiber and slit from the surface of the drying cylinder 2, which are removed from the doctor knife by air supplied through the suction nozzle 3. The forced air through the suction nozzle 4 enters the inlet of the mixer tube 5 of the ejector scrubber. The blender pipe 5 is irrigated with water rshed through a mechanical whole-flare nozzle 6. In the blender pipe 5, dust particles are captured by droplets of water sprayed in the nozzle 6. The gas-liquid stream formed in the blender 5 is directed to the droplet trap 7, where liquid gas flow from the gas stream, with trapped dust particles in it, and purified air is released into the atmosphere.

The liquid in the droplet separator 7 enters the tank 8, from which water is pumped to the nozzle 6 by means of a pump 9. The collected dust from the tank 8 is taken into the production cycle, and the water lost to the tank 8 is supplied with fresh water.

Example. After blowing the blade of the scraper blade, the exhausted air is sucked off in the amount of 200 m- / h through a pipeline with the aid of an ejector Venturi scrubber. The dust content of the aspirated air is 30 g / nm.

The nozzle serves water in an amount of 300 l / h under a pressure of 800 kPa. In a mixer tube of an ejector Venturi scrubber, veda sprayed in droplets picks up the fluff particles and transports the gas flow. After the mixing tube, the gas-liquid flow generated is directed to the separator. The water in the drip catcher, along with the captured dust, is fed into the circulation system of the irrigating liquid.,

From time to time, particles of water saturated with trapped dust particles are taken from the circulatory system with its direction into the production cycle. This amount of irrigating fluid is filled by supplying fresh water to the circulation system.

Purified air after droplet separators is emitted into the atmosphere. Purification efficiency is 98%. This returns up to 6.0 kg / h of paper pulp to production.

312А90884

Under similar conditions, carried out to the desired methods. The results are summarized by a series of experiments on the known and are presented in the table.

Famous Offered

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The table shows that the proposed method, compared with the known method, provides for the regeneration of the exhausted air by trapping dust. I. Derbak

Order 4203/28 Circulation 355. Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

25

25

particles with an efficiency of up to 98% and the return to production of previously lost fiber, fiber and fillers.

Compiled by A.Monosov

Tehred I.Popovich Proofreader G. Reshetnik

Claims (1)

METHOD FOR COLLECTING DUST PARTICLES IN THE DRYING PART OF A PAPER MACHINE, including blowing the surface of the drying cylinders with a stream of compressed air and suction of dusty air, characterized in that, in order to increase the efficiency of the process, suction of dusty air is carried out by ejection with water at a pressure of 10-15 mm of water. Art., specific flow rate of 1.0-1.5 l / m ³ · and a pressure of 600-800 kPa. a uh 4 ^ ABOUT QO OD 8productions / peo