RU81729U1 - PUMP WATER CLEANING LINE - Google Patents

Abstract

The utility model is aimed at improving waste-free technology for purification and preparation of pulp press water for return to production. The indicated technical result is achieved by eliminating the saturator from the cleaning process and using the flotation unit. The tasks are solved by the proposed line of pulp press water treatment, including a pulp press, a mezzanine, a heat exchanger-cooler, a defecator, a sulfitator and a heater installed in a technological sequence and connected with vehicles, in which a flotator, a compression chamber with an air compressor and a deaerator are installed after the defecator, and a flotator connected to its first inlet with a defecator, the first outlet to a deaerator, the second outlet to a heater and the third outlet to a compressor hydrochloric chamber, which in turn is connected at its output to a second input of the skimmer, and after sulfitatora set collection of purified water; in addition, collectors of pulp presses of varying degrees of purification with centrifugal pumps were installed before and after the mesohead and after the flotator, and a centrifugal recirculator was installed in front of the compression chamber.

Description

The utility model relates to the sugar industry, namely to technological lines for the purification of pulp press water.

A known purification line of pulp press water, including pulp trap, defecator, saturator, decanter (settler) and a heater of purified pulp press water [Koval, E.T. Return of diffusion and pulp press waters to diffusion [Text] / E.T. Koval et al. // Technical Bulletin. information. - Kiev: CINS, 1958 - No. 6. - 45 p.].

The disadvantage of the line is that the water that goes to diffusion has an alkaline reaction, which negatively affects the conduct of the diffusion process, since it increases the peptization of beet chip pectins.

The prototype of the utility model is a pulp press water treatment line, including a pulp press, a mezzanine, a sectional tubular heat exchanger-cooler, a defecator, a saturator, a circulation loop in a defecator-saturator system, a sump of pressurized pulp press water, a sulfite and a tubular heater [Osadchy, L.M. Treatment of pulp press water by defecosaturation method [Text] / L.M. Osadchiy, L.P. Andzhievsky, N.V. Kulkovets // Sah. industry - 1999. No. 3. - S.12-13.].

The disadvantage of this utility model is that the suspension of pulp of the pulp press, obtained in the sump and containing non-sugar, is sent to the channel of category III water, instead of the possible addition of separated non-sugar according to the proposed method to the pressed pulp. As a result, the plant would receive an additional amount of market pulp in the amount of 0.19 ... 0.22% by weight of beets.

In addition, a common disadvantage of defecosaturation methods

purification of pulp press water is that the process of saturation of lime-treated pulp press water leads to the need to consume additional saturation gas, and this in turn requires an increase in limestone consumption by 0.07 ... 0.20% by weight of beets.

The objectives of the proposed utility model are as follows:

- the possibility of improving waste-free technology for purification and preparation of pulp press water for return to production, which allows to reduce to a minimum the amount of pulp press water discharged to the filtration fields, and to send nesugar removed with sediment to the pressed pulp;

- elimination of the need to supply saturation gas for purification of pulp press water when replacing the defecosaturation method for purification of pulp press water with the proposed one, which will lead to a decrease in the total amount of limestone for technological needs.

The technical result from the implementation of the proposed utility model is to exclude the saturator from the cleaning process and use the flotation unit.

The tasks are solved by the proposed pulp press water treatment line, which includes a pulp press, a mega head, a heat exchanger-cooler, a defecator, a sulfitator and a heater installed in a technological sequence and connected with vehicles, in which a flotator, a compression chamber with an air compressor and a deaerator are installed after the defecator, and a flotator connected to its first inlet with a defecator, the first outlet to a deaerator, the second outlet to a heater and the third outlet to a compressor hydrochloric chamber, which in turn is connected at its output to a second input of the skimmer, and after sulfitatora set collection of purified water; in addition, collectors of pulp press water of various degrees of purification are installed before and after the mezhead and after the flotator

with centrifugal pumps, and in front of the compression chamber - a centrifugal recirculator pump. The use of the flotation method ensures the removal of conglomerates obtained by liming pulp press water, consisting of coagulated non-sugars, the main part of which are proteins and pectin substances.

Due to the use of the flotation process, a foam is formed in the flotator, consisting of air bubbles with particles of the floated material adhering to them (pulp, suspended and emulsified impurities) free of CaCO ₃ particles. The floated material freed from air bubbles is sent for mixing with the pressed pulp, increasing its amount. And since saturation gas is not involved in the cleaning process, it saves and, consequently, saves limestone.

Figure 1 shows the purification line of pulp press water.

This line consists of a pulp press 1, interfaced with a collector of pulp press 2 and a centrifugal pump 3, which supplies water to the rotary mezzanine 4; a collection of pulp press water 5 from the mezzanine 4 and a centrifugal pump 6 pumping water through a heat exchanger-cooler 7 into a defecator 8; flotator 9, air compressor 10, compression chamber 11 and centrifugal pump-recirculator 12, forming a recirculation loop; deaerator 13; a clarified phase collector 14 with a centrifugal pump 15, a heater 16, a sulfitator 17, a prepared pulp press water collector 18 with a centrifugal pump 19.

The line for the purification and preparation of pulp press water for return to production works as follows.

Fresh pulp at a temperature of 63-65 ° C enters the pulp press. The squeezed pulp is sent either to the pulp pit or for drying, and the pulp press water at a temperature of 55-58 ° C from the presses 1 enters the collector 2 and is pumped by a centrifugal pump 3 to the rotary mesohead 4 for

purification from mechanical impurities (large particles of beetroot tissue) to their final content in water of 1 g / l. The water purified on the mezzanine 4 flows by gravity into the collector 5 and is pumped by a centrifugal pump 6 through a heat exchanger-cooler 7, where it is cooled to a temperature of 48-50 ° C and enters the defecator 8 for processing it with milk of lime to alkalinity 0.10-0.15% Cao by weight of water. Lime pulp press water is directed by gravity to the flotator 9 (such as the flotator of the Flottaflux system), where it is cleaned. Water is treated in a flotator for 20 ... 25 minutes. The heavy impurities contained in the water settle to the bottom of the flotator and are periodically discharged into the category III sewage collector.

The air necessary for the flotation process is pumped by the air compressor 10 into the compression chamber 11, where, under an overpressure of 0.15-0.25 MPa, the air dissolves in the part of the purified pulp water recycled by the pump-recirculator (the amount of recirculate is 30-70% of the volume of pulp press water entering the flotator 9, depending on its purity).

The foam formed during the cleaning process is collected on the free surface of the liquid and discharged along a vacuum line from the flotator 9 to the deaerator 13, where it is extinguished. The lower descent from the deaerator 13, which is a concentrate of non-sugars of pulp press water in liquid form (in the amount of 6-9% by weight of the treated water, solids content of 22-28% by weight of the product and a purity of 36-42%), is sent to mixing with squeezed pulp. Vacuum is created by a vacuum condensing unit of vacuum filters of the BShU / BOU type.

Purified water with a purity of 88-91% from the flotator 9 flows by gravity to the collector 14, from where it is pumped through a heater 16 through a centrifugal pump 15, where it is heated to a temperature of 74-76 ° C, to a sulfitator 17 to bring the pH to 6.2-6.5 . With sulphitator 17 water gravity

flows into the collector 18 and the centrifugal pump 19 swings into the diffusion apparatus.

The compression chamber 11 and the deaerator 9 are welded or solid cylindrical vessels operating under overpressure and vacuum, respectively.

The proposed purification line pulp press water in comparison with the prototype allows you to:

- practically implement little-known methods of cleaning heterogeneous media in sugar production in order to reduce the industrial effluents of a sugar factory to a minimum;

- to avoid the use of an additional amount of saturation gas in the processing of lime pulp water and, accordingly, limestone for its production (in the amount of 0.07 ... 0.20% by weight of beets);

- get an additional amount of pressed beet pulp (0.19 ... 0.22% by weight of beets),

- to ensure the purification effect of pulp press water equal to 88 ... 91%.

Thus, the utility model allows us to solve the tasks assigned to it.

Claims (1)

A pulp press water treatment line, including a pulp press, a meat head, a heat exchanger-cooler, a defecator and a sulfitator installed in a technological sequence and connected with vehicles, characterized in that a flotator, a compression chamber with an air compressor, a deaerator and a heater are installed after the defecator, and the flotator is connected by its the first entrance with a deflector, the first exit with a deaerator, the second exit with a heater and the third exit with a compression chamber, which, in its essay It is connected by its outlet to the second input of the flotator, and a collector of purified water is installed after the sulfitator, in addition, collectors of pulp presses of various degrees of purification with centrifugal pumps are installed before and after the mesohead and after the flotator, and a centrifugal pump is used in front of the compression chamber.