RU2535559C2 - Method for control of process of production of free-flowing form of choline chloride based on dry beet pulp - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: method envisages dry beet pulp mixing with preliminarily heated choline chloride water solution and drying. The exhaust drying agent is used for choline chloride heating and heating steam generation in the steam-generator. During production one regulates heated choline chloride water solution and dry beet pulp consumption, temperature and consumption of the drying agent in the dryer according to the current value of moisture content and consumption of the mixture of dry beet pulp and choline chloride water solution. Squeezed beet pulp is preliminarily heated in the heating chamber, dried in the vibrating dryer with atmospheric pressure superheated steam. At first, exhaust superheated steam is delivered from the vibrating dryer into the purifier cyclone for purification from finely dispersed fraction. Such fraction is combined with dry pulp. Then purified exhaust superheated steam is divided in two flows. The first flow is supplied into the calorifier, condensed thus to heat atmospheric air through the calorifier dividing wall. The other flow is supplied with a blower into the steam-superheater for superheating with heating steam from the steam-generator and then - into the vibrating dryer thus to form a recirculation circuit. Heating steam condensate after the steam-superheater and superheated exhaust steam condensate after the calorifier are discharged into the condensate receiver, then -delivered for preliminary heating of squeezed beet pulp with subsequent return into the steam-generator thus to form a recirculation circuit with excessive condensate discharge from the recirculation circuit. The mixture of milled and fractioned dry pulp and choline chloride water solution is delivered into the dryer and dried with atmospheric air heated in the calorifier. According to the current values of consumption and moisture content of squeezed beet pulp one adjusts consumption and temperature of superheated steam in the vibrating dryer by way of impact, respectively, on the blower controllable drive. Additionally, one regulates consumption of heating steam by way of the steam-generator electric heating elements power variation. According to the current values of consumption and moisture content of the mixture of milled and fractioned dry pulp and choline chloride water solution one adjusts consumption and temperature of atmospheric air in the dryer by way of impact, respectively, on the blower controllable drive and consumption of superheated exhaust steam into the calorifier with correction in terms of moisture content of the ready product at the dryer outlet.

EFFECT: invention allows to enhance energy efficiency of a method for production of a free-flowing form of choline chloride.

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Description

The invention relates to the automation of technological processes and can be used to automate the process of preparing a loose form of choline chloride based on dry beet pulp.

The closest in technical essence and the achieved effect is to control the process of obtaining a granular form of powdered choline chloride from its aqueous solution [Patent No. 2356907 of the Russian Federation, C07J 1/00. Control of the process of obtaining a granular form of powdered choline chloride from its aqueous solution [Text] / A.A. Shevtsov, E.S. Shentsova, L.I. Lytkina, A.V. Drannikov, A.A. Derkanosova, D.A. Kuznetsov (Russia) - No. 2007146080; Declared December 11, 2007; published on May 27, 2009; bull. No. 15], involving the use of dry beet pulp as an active adsorbent, mixing it with a pre-heated aqueous solution of choline chloride, drying, supplying the spent drying agent to heating choline chloride before feeding it to mixing, obtaining heating steam in a steam generator with electric heating elements, a feed pump and safety valve, regulating the flow rate of a heated aqueous solution of choline chloride supplied to the mixing, and dry beet pulp after fra tioning and temperature control and flow of drying agent in the dryer on the current humidity and a mixture flow rate of dry sugar beet pulp and an aqueous choline chloride solution.

However, the known invention has the following disadvantages:

- it is not possible to ensure the accuracy and reliability of control, which is associated with the lack of a stabilization system for the technological characteristics of the product during drying under conditions of random disturbances both from the side of changes in the initial moisture content of the raw material (pressed pulp) and from possible technological failures of auxiliary equipment;

- low quality of the finished product due to the fact that the drying of choline chloride is carried out in an environment of superheated steam at high temperatures;

- low energy efficiency of the method of obtaining the finished product due to the incomplete use of the heat of the spent superheated steam and condensates formed during the drying process.

An object of the invention is to improve the accuracy and reliability of control, the quality of the finished product and the energy efficiency of the method of obtaining a granular form of choline chloride.

The stated technical problem is achieved by the fact that in the method of controlling the process of obtaining a free-flowing form of choline chloride based on dry beet pulp, using dry beet pulp as an active adsorbent, mixing it with a pre-heated aqueous solution of choline chloride, drying, supplying the spent drying agent to pre-heat choline chloride before applying it to mixing, obtaining heating steam in a steam generator with electric heating elements, a feed pump and measuring valve, the regulation of the flow rate of the heated aqueous solution of choline chloride fed to the mixing and dry beet pulp after fractionation, as well as the regulation of temperature and consumption of the drying agent in the dryer according to the current humidity and flow rate of the mixture of dry beet pulp and aqueous solution of choline chloride, is new, that pressed beet pulp is preheated in a heating chamber, then it is dried in a vibrating dryer with superheated steam of atmospheric pressure, spent the heated steam from the vibratory dryer is first sent to the cyclone cleaner to clean the fine fraction, which is combined with dry pulp, and then the purified spent superheated steam is divided into two streams, one of which, in the amount of evaporated moisture from the pulp, is fed to the air heater, where its condensation and heating of atmospheric air through the separating wall of the heater, and the other is fed by a fan to the superheater for overheating with the heating steam obtained in the steam generator, and then to the vibration dryer to form a circuit and recycling; in this case, the condensate of the heating steam after the superheater and the condensate of the exhausted superheated steam after the heater are diverted to the condensate collector, and then they are sent for preheating the pressed beet pulp with subsequent return to the steam generator with the formation of a recirculation loop and removal of excess condensate from the recirculation loop; a mixture of crushed and fractionated dry pulp and an aqueous solution of choline chloride is sent to the dryer, where it is dried with atmospheric air, heated in a heater; according to the current values of the flow rate and humidity of the squeezed out beet pulp, the flow rate and temperature of superheated steam in the vibratory dryer are set by acting on the adjustable fan drive and the flow of heating steam by changing the power of the electric heating elements of the steam generator with correction for the humidity of the dry beet pulp at the outlet of the vibrating dryer; according to the current values of the flow rate and humidity of the mixture of crushed and fractionated dry pulp and an aqueous solution of choline chloride, the flow rate and temperature of the atmospheric air in the dryer are determined by acting on the controlled fan drive and the flow rate of the exhausted superheated steam into the air heater with correction for the humidity of the finished product at the outlet of the dryer.

The technical result of the invention is to improve the accuracy and reliability of control, the quality of the finished product and the energy efficiency of the method of obtaining a granular form of choline chloride.

Figure 1 presents a diagram that implements the proposed method.

The circuit contains a heating chamber 1; vibrating dryer 2; crusher 3; sifter 4; mixer 5; nozzles 6; dryer 7; steam generator 8; safety valve 9; thermal electric heating elements 10; superheater 11; air heater 12; condensate collector 13; fan for superheated steam 14; fan for atmospheric air 15; condensate pump 16; heater 17; a pump for supplying an aqueous solution of choline chloride 18; cyclone cleaner 19, 20; microprocessor 21; lines: 0.2 - feeding pressed beet pulp for drying, 0.2.1 - feeding dry beet pulp for grinding, 0.2.2 - feeding a mixture of dry beet pulp and an aqueous solution of choline chloride for drying, 0.2.3 - outlet of the finished product, 1.0 - condensate drain heating steam to the condensate collector, 1.1 - discharge of condensate of the spent superheated steam to the condensate collector, 1.2 - supply of condensate to heat the pressed beet pulp and then to the steam generator, 2.0 - supply of heating steam to the superheater, 2.1 - removal of the spent superheated steam from the vibros shilka, 2.2 - supply of superheated steam to the dryer, 3.0 - supply of atmospheric air to the heater, 3.1 - supply of heated atmospheric air to the dryer, 3.2 - exhaust of atmospheric air from the dryer, 3.3 - supply of exhaust atmospheric air to heat the choline chloride aqueous solution, 4.0 - submission of an aqueous solution of choline chloride for heating; 4.1 - submission of a heated aqueous solution of choline chloride for mixing; sensors: FE - flow rate, WE - humidity, TE - temperature, PE - pressure, NOT - level; And - actuators.

The method is as follows.

Squeezed pulp along line 0.2 is fed for preheating to heating chamber 1, and then to vibrating dryer 2, where it is dried with superheated steam of atmospheric pressure.

The spent superheated steam through line 2.1 from the vibration dryer 2 is sent first for cleaning to the cyclone cleaner 19 from the finely divided fraction, which is combined with dry pulp and then divided into two streams. One of which, in the amount of evaporated moisture from the pulp in a vibrating dryer 2, is fed into the air heater 12, where it is condensed and atmospheric air is heated through the separating wall of the air heater. The supply of atmospheric air to the air heater 12 is carried out using the fan 15 through line 3.0 and then through line 3.1 to the dryer 7.

Another stream of spent superheated steam by the fan 14 is sent to the superheater 11 for overheating with heating steam and then through line 2.2 to the vibrating dryer 2 with the formation of a recirculation loop. Moreover, the heating steam is obtained in the steam generator 8 using thermal electric heating elements 10 and then served in the superheater 11 through line 2.0. The steam generator is equipped with a safety valve 9 to prevent emergency situations.

The resulting condensate of the heating steam and the condensate of the spent superheated steam are discharged to the condensate collector 13 along lines 1.0 and 1.1, respectively. The resulting mixture of condensates from the condensate collector 13 by pump 16 is sent along line 1.2 to heating chamber 1 for preheating the pressed beet pulp. From the heating chamber 1, the spent condensate is supplied to the steam generator 8 with the formation of a recirculation loop and the removal of excess condensate from the recirculation loop.

The resulting dry beet pulp along the line 0.2.1 is sent for grinding to the crusher 3. The crushed product is fractionated on a sifter 4. The sieve is sent to the regrind 3 for grinding, and the passage through the sieve is fed to the mixer 5, where it is mixed with the initial 70% aqueous solution of choline chloride preheated in heater 17.

Next, the resulting mixture through line 0.2.2 is sent to dryer 7, where it is dried with atmospheric air heated in air heater 12. The finished product is removed from dryer 7 through line 0.2.3.

The exhaust atmospheric air from the dryer 7 is first diverted via line 3.2 for purification to a cyclone-cleaner 20, and then via line 3.3 to a heater 17 to heat the initial 70% aqueous solution of choline chloride, which is sent to the heater by pump 18 via line 4.0. Heating choline chloride in front of nozzles 6 reduces its viscosity, and at the same time creates favorable conditions for uniform atomization of choline chloride, reliable operation of nozzles 6 is ensured, the load on the pump 18 for supplying an aqueous solution of choline chloride to the mixer 5 along line 4.1 is reduced.

The fine fraction of the free-flowing form of choline chloride obtained after purification in a cyclone cleaner 20 is combined with the stream of the finished product after dryer 7.

According to the current value of the flow rate and humidity of the squeezed out beet pulp in line 0.2, after it has been preheated in chamber 1, the microprocessor 21 sets the required flow rate of superheated steam in line 2.2 using the actuator of the adjustable fan drive 14, and the consumption of heating steam in line 2.0 by changing the power of electric heating elements 10 and, therefore, the required steam temperature in line 2.2 with correction for the current humidity value of dry beet pulp, measured by a humidity sensor installed in line 0.2.1.

According to the current value of the consumption of dry beet pulp after fractionation on the sifter 4 (sieve pass), the microprocessor 21 sets the flow rate of the heated aqueous solution of choline chloride supplied to the mixing in the mixer 5 via line 4.1, using the actuator of an adjustable pump drive 9.

According to the sensors on the costs of dry beet pulp after fractionation and an aqueous solution of choline chloride, the microprocessor sets the performance of the mixer 5 by affecting the speed of its working body using the actuator.

Based on the current values of the flow rate and humidity of the mixture of crushed and fractionated dry pulp and an aqueous solution of choline chloride in line 0.2.2, the microprocessor 21, using the actuator of the adjustable fan drive 15, sets the required flow rate of heated air in line 3.1, and by changing the flow rate of exhausted superheated steam in line 2.1, by means of an actuator, its required temperature with correction for the current moisture value of the finished product at the outlet of the dryer 7, measured by a humidity sensor, set in line 0.2.3.

According to the current value of the level of condensate in the steam generator 8, the microprocessor performs on-off regulation by increasing the power to the adjustable pump drive for supplying condensate 16 by means of an actuator in the event of a decrease in the level below the set value and discharge of excess condensate in the case of an increase in the level above the set value.

In the case of technological and emergency failures in the operation of the steam generator 8, associated with a possible increase in the pressure of the heating steam in its working volume, a safety valve 9 is provided.

According to the current values of temperature and flow rate of a 70% aqueous solution of choline chloride in line 4.0, microprocessor 21 determines, by means of an actuator, the required flow rate of exhaust air for heating choline chloride in line 3.3. Excess exhaust air is released into the environment.

Thus, the proposed method for controlling the process of obtaining a free-flowing form of choline chloride based on dry beet pulp, in comparison with the known one, allows:

- to ensure the accuracy and reliability of control at all stages of drying due to the operational regulation of its technological parameters according to the current moisture content of the raw materials obtained before the drying process;

- to improve the quality of the finished product due to the fact that the drying of the mixture of dry pulp and choline chloride is carried out by atmospheric air, the temperature of which is lower than the temperature of superheated steam;

- to increase the energy efficiency of the method due to the full use of the heat of the spent superheated steam and condensates formed during the drying process.

Claims (1)

A method for controlling the process of obtaining a loose form of choline chloride based on dry beet pulp, which involves the use of dry beet pulp as an active adsorbent, mixing it with a pre-heated aqueous solution of choline chloride, drying, supplying the spent drying agent to pre-heat the choline chloride before it is mixed, obtaining heating steam in a steam generator with electric heating elements, a feed pump and a safety valve, heating flow control o an aqueous solution of choline chloride coming to the mixing and dry beet pulp after fractionation, as well as controlling the temperature and flow rate of the drying agent in the dryer according to the current humidity and flow rate of the mixture of dry beet pulp and an aqueous solution of choline chloride, characterized in that the pressed beet pulp is preheated in the heating chamber, then it is dried in a vibrating dryer with superheated steam of atmospheric pressure, the spent superheated steam from the vibrating dryer is sent first to the cycle The n-cleaner is used to clean the fine fraction, which is combined with dry pulp, and then the purified spent superheated steam is divided into two streams, one of which, in the amount of evaporated moisture from the pulp, is fed into the air heater, where it condenses and air is heated through the separating wall of the heater, and the other is fed by a fan to the superheater for overheating with the heating steam obtained in the steam generator, and then to the vibration dryer with the formation of a recirculation loop; in this case, the condensate of the heating steam after the superheater and the condensate of the exhausted superheated steam after the heater are diverted to the condensate collector, and then they are sent for preheating the pressed beet pulp with subsequent return to the steam generator with the formation of a recirculation loop and removal of excess condensate from the recirculation loop; a mixture of crushed and fractionated dry pulp and an aqueous solution of choline chloride is sent to the dryer, where it is dried with atmospheric air, heated in a heater; according to the current values of the flow rate and humidity of the squeezed out beet pulp, the flow rate and temperature of superheated steam in the vibratory dryer are set by acting on the adjustable fan drive and the flow of heating steam by changing the power of the electric heating elements of the steam generator with correction for the humidity of the dry beet pulp at the outlet of the vibrating dryer; according to the current values of the flow rate and humidity of the mixture of crushed and fractionated dry pulp and an aqueous solution of choline chloride, the flow rate and temperature of the atmospheric air in the dryer are determined by acting on the controlled fan drive and the flow rate of the exhausted superheated steam into the air heater with correction for the humidity of the finished product at the outlet of the dryer.

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