CN101863987A - Starch production system with decanter centrifuge for underflow material - Google Patents

Abstract

The invention discloses a starch production system with a decanter centrifuge for treating underflow materials, including a clarification centrifuge, a concentrating cyclone, a scraper centrifuge overflow tank, a main separator feed tank, a main separator, and starch refining Cyclone, refined starch milk tank, top flow tank of starch milk refining system; the inlet of the clarifier centrifuge is connected to the filtrate outlet pipeline of the scraper centrifuge; The flow liquid tank is connected to the overflow outlet pipeline of the scraper centrifuge; the outlet of the overflow liquid tank of the scraper centrifuge is connected to the feed inlet pipeline of the decanter centrifuge; the decanter centrifuge separates the light and heavy phases of the materials in the overflow liquid tank of the scraper centrifuge, The top flow of the decanter centrifuge returns to the top flow tank of the starch milk refining system, and the bottom flow enters the refined starch milk tank. The decanter centrifuge is used to treat the overflow liquid and filtrate, which reduces the feeding amount of the main separator, reduces the load of the main separator, increases the production load and protein yield, and reduces production consumption.

Description

Starch production system with decanter centrifuge for underflow material

technical field

The invention relates to a starch production device system, and in particular discloses a starch production system with a decanter centrifuge for processing underflow materials, which is suitable for improving the quality of starch and reducing the protein content in finished starch and improving the yield of protein feed Wet processing belongs to the technical field of grain processing.

Background technique

As we all know, the corn starch production wet processing fine slurry is separated by the pre-concentration separator and the main separator, and the underflow enters the starch milk refining system, enters the scraper centrifuge for dehydration, and then enters the airflow drying system, and obtains the finished starch after airflow drying. During the working process of the scraper centrifuge, a part of the overflow of the scraper centrifuge and a part of the filtrate of the scraper are produced. The scraper centrifuge overflow and scraper filtrate have a low concentration and need to be concentrated.

The existing wet processing plant system for corn starch production is shown in Figure 1, including clarification centrifuge, thickening cyclone, overflow liquid tank of scraper centrifuge, main separator feed tank, main separator, starch refining cyclone , Refined starch milk tank, top flow tank of starch milk refining system; scraper centrifuge overflow liquid is processed by concentrating cyclone, scraper filtrate is concentrated by clarification centrifuge, bottom flow heavy phase material after concentrating cyclone and clarification centrifuge Both enter the feed tank of the main separator, and then enter the separation system of the main centrifuge, and then concentrate again through the main separator and starch milk refining system.

The concentration of the underflow of the prior art starch milk refining system is 20-20.5 Baume; the unit consumption of water is 2.76 tons/ton; the unit consumption of electricity is 215.16 kWh/ton; Circulation increases the load of the main separator, or even overloads it, resulting in high production consumption and low protein yield.

Contents of the invention

The invention discloses a starch production system with a decanter centrifuge for treating underflow materials, which solves the problem of the repeated circulation of the underflow materials in the system after the treatment of the underflow materials by the thickening cyclone and the clarification centrifuge in the prior art to increase the load of the main separator. Large, even overloaded operation, high production consumption, low protein yield and other problems.

The invention includes clarification centrifuge, concentrating cyclone, scraper centrifuge overflow liquid tank, main separator feed tank, main separator, starch refining cyclone, refined starch milk tank, starch milk refining system top flow tank, Conveyor pump; the inlet of the clarifier centrifuge is connected to the filtrate outlet pipeline of the scraper centrifuge, the filtrate of the scraper centrifuge enters the clarifier centrifuge, the overflow liquid tank of the scraper centrifuge is connected to the overflow outlet pipeline of the scraper centrifuge, and the overflow liquid of the scraper centrifuge enters The overflow tank of the scraper centrifuge; it is characterized in that it also includes a decanter centrifuge; the bottom outlet of the clarifier centrifuge is connected to the pipeline of the overflow tank of the scraper centrifuge, and the bottom flow of the filtrate of the scraper centrifuge enters the overflow of the scraper centrifuge after being treated by the clarifier centrifuge Fluid tank; the outlet of the overflow tank of the scraper centrifuge is connected to the pipeline of the decanter centrifuge; the inlet of the delivery pump is connected to the overflow tank of the scraper centrifuge; the outlet of the delivery pump is connected to the inlet of the decanter centrifuge; the delivery pump The dry matter in the overflow liquid tank of the scraper centrifuge with a concentration of about 15% is sent to the decanter centrifuge, and the decanter centrifuge separates the light and heavy phases of the materials in the overflow liquid tank of the scraper centrifuge, and concentrates them under the action of centrifugal force to reach a concentration of 40-45% dry matter, the top flow light phase dry matter of the decanter centrifuge is about 2.989T/h back to the top flow tank of the starch milk refining system. The underflow of the decanter centrifuge directly enters the refined starch milk tank, so that this part of the material does not need to enter the separator system, which reduces the feed amount of the main separator, reduces the load of the main separator, reduces production consumption, and improves production. loading and protein yield.

Decanter centrifuge of the present invention is 1--3. The processing capacity of a single unit is 35m3/h.

The horizontal screw centrifuge of the present invention includes a feed inlet, a differential gear, a screw unloader, a drum, a shell, a machine base, a solid phase bucket, a liquid phase bucket, a slag outlet, a liquid phase mouth, a front bearing, and a rear bearing The decanter centrifuge has a settling wall; the differential is fixed on the drum, and the drum is mounted on the machine base through bearing support; the drum has a hollow straight cylinder inner wall and a hollow cone inner wall; the solid phase bucket Installed at the rear of the small end of the hollow cone of the drum; there is a slag outlet on the solid phase bucket; there is a feeding port on the shell; the screw unloader is supported and assembled in the drum by the front bearing and the rear bearing, and the screw unloads is connected differentially with the differential. The casing is fixed on the base to accommodate the airtight drum. When the drum reaches the rated speed n1, due to the action of the differential, the screw unloader produces a rated differential speed, the differential speed Δn=n1×i, n1 is the speed of the main pulley of the differential, and i is the differential speed Gear ratio. The material in the overflow filtrate tank of the scraper centrifuge is input into the decanter centrifuge through the feed port. Under the action of a strong centrifugal force field, the solid particles with a large specific gravity are thrown to the settling wall surface and quickly deposited on the inner wall of the drum. Pushed by the screw unloader, the sediment is continuously pushed to the small end of the hollow cone of the drum, and after passing through the solid phase bucket, it flows from the slag outlet to the refined starch milk tank. The separated liquid phase overflows from the drum to the liquid phase hopper, and flows through the liquid phase port to the top flow tank of the starch milk refining system. The suspension is continuously input, and the screw unloader continuously pushes the centrifuged solid phase out of the drum. Realize continuous solid phase and liquid phase separation.

The decanter centrifuge of the present invention also includes a solid phase cavity and a liquid phase cavity; the solid phase cavity is installed on the lower part of the housing on the small end side of the hollow cone of the drum; the solid phase bucket is connected and installed under the solid phase cavity; the liquid phase cavity is installed on the The lower part of the shell on the side of the hollow straight cylinder of the drum; the liquid phase bucket is connected and installed under the liquid phase chamber.

The decanter centrifuge of the present invention also includes a motor, a belt, and a pulley; the pulley is installed on the output shaft of the motor and the drive shaft of the drum; the belt is installed on the pulley, and the belt drives.

The first feed port of the decanter centrifuge of the present invention is 350×710, the long hole opened in the diameter direction is 1.2 mm, and the slag outlet is 550×710.

The invention has the advantages that: the overflow liquid and the filtrate are processed by the decanter centrifuge, the feed amount of the main separator is reduced, the load of the main separator is reduced, the production load and protein yield are increased, and the production consumption is reduced.

Description of drawings

Fig. 1 is known device system diagram;

Fig. 2 is the device system diagram of the present invention;

Fig. 3 is the structural representation of the decanter centrifuge in the system of the present invention;

Fig. 4 is a side view of the decanter centrifuge in the system of the present invention.

In the figure: 1 Rear bearing, 2 Shock absorbing pad, 3 Feed inlet, 4 Feed pipe, 5 Pulley, 6 Front bearing, 7 Screw unloader, 8 Drum, 9 Shell, 10 Differential, 11 Fluid Phase port, 12 liquid phase bucket, 13 solid phase chamber, 14 slag outlet, 15 solid phase bucket, 16 motor, 17 belt, 18 feed valve, 19 liquid phase chamber, 20 machine base.

Detailed ways

The following is an embodiment of the present invention.

As shown in Figure 2: the present invention includes clarification centrifuge, concentrating cyclone, scraper centrifuge overflow tank, main separator feed tank, main separator, starch refining cyclone, refined starch milk tank, starch milk Refining system top flow tank, delivery pump, two decanter centrifuges with a single processing capacity of 35m ³ /h; the inlet of the clarifier centrifuge is connected to the filtrate outlet pipeline of the scraper centrifuge, and the filtrate of the scraper centrifuge enters the clarification centrifuge, and the scraper centrifuge The overflow liquid tank is connected to the overflow outlet pipeline of the scraper centrifuge, and the overflow liquid of the scraper centrifuge enters the overflow liquid tank of the scraper centrifuge; After being treated by the clarification centrifuge, the underflow enters the overflow liquid tank of the scraper centrifuge; the inlet of the transfer pump is connected with the outlet of the overflow liquid tank of the scraper centrifuge; the outlet of the transfer pump is connected with the inlet of the decanter centrifuge; the transfer pump centrifuges the scraper centrifuge The concentration of the machine overflow liquid tank is about 15%. The dry matter is sent to two decanter centrifuges. The decanter centrifuge separates the light and heavy phases of the materials in the overflow liquid tank of the scraper centrifuge, and concentrates them under the action of centrifugal force to reach a concentration of 40. -45% dry matter, about 2.989T/h of light phase dry matter in the top flow of the decanter centrifuge is returned to the top flow tank of the starch milk refining system. The underflow of the decanter centrifuge directly enters the refined starch milk tank, so that this part of the material does not need to enter the separator system, which reduces the feed amount of the main separator, reduces the load of the main separator, reduces production consumption, and improves production. loading and protein yield.

As shown in Figure 3 and Figure 4: the decanter centrifuge includes rear bearing 1, shock pad 2, feed port 3, feed pipe 4, pulley 5, front bearing 6, screw unloader 7, drum 8, Housing 9, differential gear 10, liquid phase port 11, liquid phase bucket 12, solid phase chamber 13, slag outlet 14, solid phase bucket 15, motor 16, belt 17, feed valve 18, liquid phase chamber 19, The base 20; the decanter centrifuge has a settling wall; the drum 8 has a hollow straight cylinder inner wall and a hollow cone inner wall; the differential 10 is fixed on the drum 8 by screws, and the drum 8 is supported by bearings Assembled on the base 20. The shock pad 2 is installed under the machine base 20 , the screw unloader 7 is supported and assembled in the drum 8 through the front bearing 6 and the rear bearing 1 , and the screw unloader 7 is differentially connected with the differential 10 . The casing 9 is fixed on the base 20 to accommodate the airtight drum 8 . The solid phase chamber is installed at the lower part of the rear shell on the small end side of the hollow cone of the drum; the solid phase bucket is connected and installed under the solid phase chamber; the solid phase bucket 15 has a slag outlet 14; the liquid phase chamber 19 is installed on the drum The lower part of the shell on the side of the hollow straight cylinder; the liquid phase bucket is connected and installed under the liquid phase chamber. The feed pipe 4 is installed on the housing 9; the feed pipe 4 has a feed port 3; the front part of the feed port 3 is connected with a feed valve 18; the belt pulley 5 is installed on the output shaft of the motor 16 and the drive shaft of the drum 8 On; the drum 8 is driven by the motor 16 and the belt 17 to rotate. The rotating drum 8 reaches the rated rotational speed n1, and due to the action of the differential 10, the screw unloader 7 produces a rated differential rotational speed, the differential rotational speed Δn=n1×i, n1 is the rotational speed of the main pulley of the differential, i is the differential speed ratio. The material in the overflow filtrate tank of the scraper centrifuge is input into the decanter centrifuge through the feed port 3, and under the action of a strong centrifugal force field, the solid phase particles with a large specific gravity are thrown to the settling wall surface, and are quickly deposited on the inner wall of the drum 8 On the top, through the promotion of the screw unloader 7, the sediment is continuously pushed to the small end of the hollow cone of the drum 8, and then flows through the solid phase bucket 15 to the refined starch milk tank through the slag outlet 14. The separated liquid phase overflows from the rotating drum 8 to the liquid phase hopper 12, and flows through the liquid phase port 11 to the top flow tank of the starch milk refining system. The suspension is continuously input, and the screw unloader 7 pushes the centrifuged solid phase out of the drum 8 continuously. Realize continuous solid phase and liquid phase separation.

The first feeding port of the feeding device of the decanter centrifuge in this embodiment is 350×710, the long hole in the diameter direction is 1.2 mm, and the slag outlet is 550×710.

The dry matter throughput of the pre-concentration separator in this embodiment is reduced to 66.2 tons/hour from the original 71.2 tons/hour, which is about 7.0% lower; the dry matter throughput of the main separator is reduced to 88.3 tons/hour from the original 92.3 tons/hour, which is reduced About 4.3%; the underflow dry matter throughput of the starch milk refining system decreased from the original 59.4 tons/hour to 52.5 tons/hour, a decrease of about 11.7%; the underflow concentration of the starch milk refining system was 20.5-21.5 Baume, and the underflow concentration increased by 1 Baume; Due to the increase in the underflow concentration of the starch milk refining system, the overflow of the scraper centrifuge and the dry matter of the filtrate are reduced by 4%; the unit water consumption is 2.62 tons/ton, which can save 21 tons/hour of fresh water consumption; the load of the main separator is reduced by 12.92%, Reduce the load of the starch milk refining system by 13.33%; reduce a 37kw clarification centrifuge; the unit power consumption is 212.48 kWh/ton.

Claims (7)

1. A starch production system with a decanter centrifuge for processing underflow materials, including a clarifying centrifuge, a thickening cyclone, a scraper centrifuge overflow tank, a main separator feed tank, a main separator, and a starch refining cyclone flow device, refined starch milk tank, top flow tank of starch milk refining system, the inlet of the clarifier centrifuge is connected with the filtrate outlet pipeline of the scraper centrifuge, the filtrate of the scraper centrifuge enters the clarifier centrifuge, the overflow liquid tank of the scraper centrifuge is connected with the overflow of the scraper centrifuge Outlet pipeline connection, the overflow liquid of the scraper centrifuge enters the overflow liquid tank of the scraper centrifuge; also includes the decanter centrifuge; the bottom outflow port of the clarification centrifuge is connected with the overflow liquid tank pipeline of the scraper centrifuge; the overflow liquid of the scraper centrifuge The outlet of the tank is connected to the pipeline of the feed port of the decanter centrifuge; the liquid phase port of the decanter centrifuge is connected to the top flow tank of the starch milk refining system; the solid phase port of the decanter centrifuge is connected to the refined starch milk tank. 2. The starch production system according to claim 1, characterized in that: the decanter centrifuge comprises a feed inlet, a differential, a screw unloader, a drum, a housing, a support, a solid phase bucket, a liquid phase Bucket, slag outlet, liquid phase port, front bearing, rear bearing; decanter centrifuge has a settling wall; drum has a section of hollow straight cylinder inner wall and a hollow cone inner wall; differential is fixed on the drum , the drum is mounted on the machine base through the bearing support; the screw unloader is assembled in the drum through the front bearing and the rear bearing support, and the screw unloader is differentially connected with the differential; the shell is fixed on the machine base to accommodate the airtight The drum; the solid phase bucket is installed under the rear shell at the small end of the hollow cone of the drum; the solid phase bucket has a slag outlet; the liquid phase bucket is installed under the shell on the hollow straight cylindrical side of the drum. 3. The starch production system according to claim 1 or 2, characterized in that: the decanter centrifuge also includes a solid phase cavity and a liquid phase cavity; the solid phase cavity is installed on the shell of the small end side of the hollow cone of the drum The lower part; the solid phase bucket is connected and installed under the solid phase chamber; the liquid phase chamber is installed at the lower part of the shell on the hollow cylindrical side of the drum; the liquid phase bucket is connected and installed under the liquid phase chamber. 4. starch production system according to claim 1 or 2, is characterized in that: decanter centrifuge also comprises motor, belt, belt pulley; Belt pulley is installed on the motor output shaft and on the drum drive shaft; Belt drive turns. 5. The starch production system according to claim 1 or 2, characterized in that the processing capacity of a single decanter centrifuge is 35 m ³ /h. 6. The starch production system according to claim 1 or 2, characterized in that: the first feed port of the decanter centrifuge is 350×710, the long hole in the diameter direction is 1.2mm, and the slag outlet is 550×710. 7. The starch production system according to claim 1, characterized in that: there are 1--3 decanter centrifuges.

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