阅读说明：本技术 淀粉液化生产工艺及其生产系统 (Starch liquefaction production process and production system thereof ) 是由 李学广 史晓波 乔改芬 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种淀粉液化生产工艺,采用一次喷射工艺对加有α-淀粉酶的淀粉乳进行液化,将淀粉乳以连续方式输送至蒸汽喷射器,然后从蒸汽喷射器的出口经过不少于2m的垂直射程进入承压罐,在承压罐内,淀粉乳从承压罐顶部的入口喷洒下来,经过悬置在承压罐内、呈锥面状的分散板进行二次分散,然后沿分散器与承压罐内壁之间的空隙落入承压罐底部,汇集至承压罐底部的出口流至静态混合器,物料以下进上出的方式经过静态混合器后,进入入口直径大于出口直径的维持盘管,最后进入液化闪蒸罐,完成淀粉液化反应。本发明的淀粉液化生产工艺,能够显著提高淀粉乳的液化效果,实现以一次喷射工艺替代现有淀粉液化的二次喷射工艺,极大降低生产成本。(The invention discloses a starch liquefaction production process, which adopts a primary injection process to liquefy starch milk added with α -amylase, conveys the starch milk to a steam injector in a continuous mode, then enters a pressure-bearing tank from an outlet of the steam injector through a vertical range of not less than 2m, in the pressure-bearing tank, the starch milk is sprayed from an inlet at the top of the pressure-bearing tank, is subjected to secondary dispersion through a dispersion plate suspended in the pressure-bearing tank and in a conical surface shape, then falls into the bottom of the pressure-bearing tank along a gap between the dispersion device and the inner wall of the pressure-bearing tank, converges to an outlet at the bottom of the pressure-bearing tank, flows to a static mixer, and enters a maintaining coil pipe with the diameter of the inlet larger than that of the outlet after materials enter and exit from the static mixer, and finally enters a liquefaction flash tank to finish starch liquefaction reaction.)

1. A starch liquefaction production process is characterized in that a primary injection process is adopted to liquefy starch milk added with α -amylase, and the primary injection process comprises the following steps:

a. the starch milk added with α -amylase is continuously conveyed to a steam ejector, and then enters a pressure-bearing tank from the outlet of the steam ejector through a vertical range of not less than 2 m;

b. in the pressure-bearing tank, starch milk is sprayed from an inlet at the top of the pressure-bearing tank, is secondarily dispersed by a conical dispersion plate suspended in the pressure-bearing tank, then falls into the bottom of the pressure-bearing tank along a gap between the dispersion plate and the inner wall of the pressure-bearing tank, and is collected to an outlet at the bottom of the pressure-bearing tank to flow to a static mixer;

c. the materials pass through the static mixer in a mode of entering and exiting from the lower part, then enter the maintaining coil pipe with the diameter of the inlet larger than that of the outlet, and finally enter the liquefaction flash tank to finish the starch liquefaction reaction.

2. The starch liquefaction production process according to claim 1, characterized in that: the dispersion board sets up in the pressure-bearing jar apart from top entry 2.0 ~ 2.3m department, dispersion board top contained angle is 110 ~ 120.

3. The starch liquefaction production process of claim 1, characterized in that the baume degree of the starch milk is 17.0-18.5 ° Be, and the addition amount of α -amylase in the starch milk is 0.10-0.16 kg/t dry starch.

4. The starch liquefaction production process according to claim 1, characterized in that: the pressure-bearing tank, the static mixer and the maintaining coil pipe are all at the pressure of 0.1-0.2 MPa and the temperature of 105-108 ℃.

5. The starch liquefaction production process according to claim 1, characterized in that: the time from the starch milk entering the pressure-bearing tank to the starch milk entering the liquefaction flash tank is 5-10 min.

6. A starch liquefaction production system which characterized in that: the starch milk liquefaction device is characterized by comprising a steam ejector, wherein a feed inlet of the steam ejector is connected with a starch milk conveying pipeline, a discharge outlet of the steam ejector is connected to a material inlet of a pressure-bearing tank through a vertical pipeline, the material inlet is formed in the top of the pressure-bearing tank, a dispersion plate in a conical surface shape is arranged in the pressure-bearing tank in a middle upper portion in a hanging mode, a material outlet is formed in the bottom of the pressure-bearing tank, the material outlet is connected to an inlet in the bottom of a static mixer through a pipeline, an outlet of the static mixer is formed in the top, and the outlet of the static mixer is connected.

7. The starch liquefaction production system of claim 6, wherein: the dispersion board is through fixing the unsettled setting of bracing piece at the pressure-bearing jar inner wall in the pressure-bearing jar apart from top material entry 2.0 ~ 2.3m department, dispersion board top contained angle is 110 ~ 120, and the dispersion board is the smooth surface towards the face of material entry.

8. The starch liquefaction production system of claim 6, wherein: the ratio of the area of the bottom surface of the cone of the dispersing plate surrounding structure to the area of the cross section of the pressure-bearing tank is (0.70-0.80): 1.

9. the starch liquefaction production system of claim 6, wherein: the bottom of the pressure-bearing tank is in an inverted cone shape, and the material outlet is arranged at the cone tip of the inverted cone shape.

Technical Field

The invention relates to the technical field of starch liquefaction, in particular to a starch liquefaction production process and a starch liquefaction production system.

Background

The starch sugar production process generally adopts a double-enzyme method of enzyme liquefaction and enzyme saccharification, namely, starch molecules are randomly cut into short-chain molecules with average 7-8 glucose molecules (corresponding to DE value of 12-14) units by liquefying enzyme, and glucose units are hydrolyzed one by one after a large amount of saccharifying enzyme is combined with the short-chain molecules one by one.

Starch liquefaction is that starch expands rapidly under the heating condition after meeting water, the feed liquid viscosity increases, and starch intermolecular force weakens, causes starch granule to disintegrate, and high temperature amylase begins the effect this moment, and the starch of hydrolysising fast constantly becomes littleer glucose polymer, finally obtains short chain dextrin, and this process is starch sugar production's key process, can reduce feed liquid viscosity fast to do benefit to glucoamylase further hydrolysis to monosaccharide. The liquefaction degree is not good, not only the filtration of the subsequent process is difficult, but also the crystallization and the centrifugal separation become very difficult or even impossible due to the existence of the macromolecular dextrin. The existing starch liquefaction usually needs a secondary injection process, wherein a primary injection maintaining tank is designed to be in an upper-inlet and lower-outlet mode, the injection pressure is about 0.5mpa, the steam pressure pushes materials to be in a maintaining coil pipe and cannot achieve turbulence and collision, the maintaining time is about 54s, the materials with short maintaining time cannot be fully hydrolyzed, the dosage of an enzyme preparation is large, the sugar conversion yield is reduced, and the production cost is increased.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a starch liquefaction production process, wherein a dispersion plate structure is additionally arranged in a jet pressure-bearing tank to strengthen the turbulence, collision and dispersion effects of starch milk, and a static mixer is additionally arranged before the starch milk enters a maintaining coil pipe, so that the liquefaction effect of the starch milk is obviously improved, the primary jet process is used for replacing the conventional secondary jet process for starch liquefaction, the starch liquefaction effect is ensured, the production process is simplified, and the production cost is greatly reduced.

In order to achieve the purpose, the starch liquefaction production process provided by the invention adopts a one-time injection process to liquefy starch milk added with α -amylase, and the one-time injection process comprises the following steps:

a. the starch milk added with α -amylase is continuously conveyed to a steam ejector, and then enters a pressure-bearing tank from the outlet of the steam ejector through a vertical range of not less than 2 m;

b. in the pressure-bearing tank, starch milk is sprayed from an inlet at the top of the pressure-bearing tank, is secondarily dispersed by a conical dispersion plate suspended in the pressure-bearing tank, then falls into the bottom of the pressure-bearing tank along a gap between the dispersion plate and the inner wall of the pressure-bearing tank, and is collected to an outlet at the bottom of the pressure-bearing tank to flow to a static mixer;

c. the materials pass through the static mixer in a mode of entering and exiting from the lower part, then enter the maintaining coil pipe with the diameter of the inlet larger than that of the outlet, and finally enter the liquefaction flash tank to finish the starch liquefaction reaction.

The starch liquefaction production process of the invention utilizes the structure of the dispersion plate additionally arranged in the pressure-bearing tank to make the starch milk ejected from the steam ejector collide and disperse on the surface of the dispersion plate at high speed, thereby enhancing the turbulence of the starch milk, the starch milk after secondary dispersion is converged to the bottom of the pressure-bearing tank from the gap between the dispersion plate and the inner wall along the inner wall of the pressure-bearing tank, and then is fully and uniformly mixed by the static mixer in a mode of entering and exiting from the lower part, the mixing effect is strengthened on the premise of ensuring static flow, and the maintenance time of the starch milk in the pressure-bearing tank and the static mixer under the liquefaction pressure and temperature is properly prolonged, thereby obviously improving the liquefaction efficiency and the subsequent sugar conversion rate, saving the amylase dosage, and finally the starch milk flowing out from the top of the static mixer enters the liquefaction pressure-relief flash tank through the maintenance coil pipe to complete. The starch liquefaction through the one-time spraying process can improve the liquefaction effect, promote the subsequent saccharification process to reach higher sugar conversion rate and reduce the dosage of amylase. The primary injection process can ensure stable high reaction rate, and realize the replacement of the existing starch liquefaction secondary injection process, thereby simplifying the production process and obviously reducing the production cost.

As the limitation to the technical scheme, the dispersion plate is arranged in the pressure-bearing tank at a distance of 2.0-2.3 m from the top inlet, and the included angle of the top of the dispersion plate is 110-120 degrees.

As a limitation on the technical scheme, the baume degree of the starch milk is 17.0-18.5 DEG Be, and the addition amount of α -amylase in the starch milk is 0.10-0.16 kg/t dry starch.

As the limitation to the technical scheme, the pressure in the pressure-bearing tank, the pressure in the static mixer and the pressure in the maintaining coil pipe are all 0.1-0.2 MPa, and the temperature is all 105-108 ℃.

As a limitation on the technical scheme, the time from the starch milk entering the pressure-bearing tank to the starch milk entering the liquefaction flash tank is 5-10 min.

Further inject the position of dispersion plate suspension in the pressure-bearing tank, dispersion plate top contained angle, starch milk concentration, α -amylase addition, technological parameters such as liquefaction pressure, temperature and the hold time from getting into the pressure-bearing tank to the liquefaction flash tank pressure release make starch liquefaction reaction rate higher, more do benefit to and improve follow-up saccharification conversion.

Meanwhile, the invention also provides a starch liquefaction production system which comprises a steam ejector, wherein a feed inlet of the steam ejector is connected with a starch milk conveying pipeline, a discharge outlet of the steam ejector is connected to a material inlet of the pressure-bearing tank through a vertical pipeline, the material inlet is arranged at the top of the pressure-bearing tank, a conical dispersion plate is arranged in the pressure-bearing tank in a suspending manner at the middle upper part, a material outlet is arranged at the bottom of the pressure-bearing tank, the material outlet is connected to an inlet at the bottom of a static mixer through a pipeline, an outlet of the static mixer is arranged at the top, and is connected to a liquefaction flash tank through a maintaining coil pipe from the outlet at the top.

As the injecture to above-mentioned technical scheme, the dispersion board is through fixing the unsettled setting of bracing piece at the pressure-bearing jar inner wall in the pressure-bearing jar apart from top material entry 2.0 ~ 2.3m department, dispersion board top contained angle is 110 ~ 120, and the dispersion board is the smooth surface towards the face of material entry.

As a limitation on the technical scheme, the ratio of the area of the conical bottom surface of the dispersing plate surrounding structure to the area of the cross section of the pressure-bearing tank is (0.70-0.80): 1.

as the limitation to the technical scheme, the bottom of the pressure-bearing tank is in an inverted cone shape, and the material outlet is arranged at the cone tip of the inverted cone shape.

In order to facilitate the starch liquefaction process, the invention provides a matched production system, which is convenient for the operation and control of the liquefaction process and can ensure the stable and efficient liquefaction reaction. Further inject the structure of dispersion board, the suspension position in the pressure-bearing jar, with the size of the inside space of pressure-bearing jar, pressure-bearing jar bottom structure, maintain equipment parameters such as coil pipe entry, export diameter to make starch like secondary dispersion effect, maintenance time reach the optimum, obtain higher starch sugar conversion rate.

In conclusion, the starch liquefaction production process obtained by adopting the technical scheme of the invention combines the high-speed collision and dispersion action of the dispersion plate in the pressure-bearing tank on the starch milk with the homogenizing action of the static mixer, strengthens the turbulence, dispersion and mixing of the starch milk on the premise of ensuring the static flow of the starch milk, and properly prolongs the maintaining time of the starch milk in the pressure-bearing tank and the static mixer under the liquefaction pressure and temperature, thereby obviously improving the liquefaction efficiency and the subsequent sugar conversion rate and saving the using amount of amylase. The primary injection process can replace the secondary injection of the existing starch liquefaction technology, simplify the production process, reduce the production cost, and further carry out primary injection liquefaction on the starch milk in the matched production system provided by the invention, thereby not only facilitating the operation and control of the process, but also ensuring the stable and efficient operation of the liquefaction reaction and obtaining higher starch sugar conversion rate.

Drawings

The invention will be described in more detail with reference to the following drawings and specific embodiments:

FIG. 1 is a schematic structural diagram of a starch liquefaction production system according to the present invention.

In the figure: 1-a steam ejector; 101-a steam inlet of a steam ejector; 2-the feed inlet of the steam ejector; 3-a discharge port of the steam ejector; 4-a pressure-bearing tank; 41-a support bar; 5-material inlet; 51-ball valve; 6-a dispersion plate; 7-material outlet; 8-a static mixer; 81-helical piece; 9-maintaining the coil pipe; 10-liquefaction flash tank.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.