CN112844517A

CN112844517A - Rice processing method capable of reducing energy consumption

Info

Publication number: CN112844517A
Application number: CN201911102451.5A
Authority: CN
Inventors: 龚瑛
Original assignee: Hunan Jintai Rice Industry Co ltd
Current assignee: Hunan Jintai Rice Industry Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2021-05-28

Abstract

A rice processing method for reducing energy consumption is characterized by sequentially comprising the following steps: (1) cleaning: screening to remove blighted grains, magnetically separating to remove magnetic impurities in the rice and removing stones; (2) hulling rice: hulling rice with a huller, and separating rice from brown rice after hulling; (3) rice milling: grinding brown rice into rice with a rice mill, and atomizing with cellulose water solution before milling; (4) and (3) post-treatment: comprises the steps of rice polishing, rice cooling and rice grading and packaging. The method can reduce broken rice and remaining brown rice in the rice milling process, and can also reduce energy consumption of rice milling.

Description

Rice processing method capable of reducing energy consumption

Technical Field

The invention belongs to the technical field of rice processing, and particularly relates to a rice processing method for reducing broken rice quantity and rice milling energy consumption.

Background

The rice is a finished product prepared by the working procedures of rice cleaning, rice hulling, rice milling, finished product finishing and the like. The cleaning process is to remove various impurities mixed in the rice by proper equipment through proper process flow and proper operation method so as to improve the quality of the finished rice product, and simultaneously, iron nails, scrap iron and the like in the rice are removed by using magnets so as to ensure the production safety. The rice hulling step is to hulle the rice by a rubber roller huller or a carborundum huller and separate the chaff from the brown rice. The rice milling process is to grind and rub the brown rice by a rice mill to separate the cortex from the endosperm, and then to perform the treatments of rice brushing, bran removal, crushing, rice airing and the like, thus obtaining the rice with required grade. The modern novel rice is further processed by color sorting, winnowing, bacterium and dust removing, sterilization and insect prevention, antibiosis, oxygen resistance, enzyme inhibition, bionic packaging and the like so that the rice is more sanitary, safer, fresh, fragrant and nutritional and has less loss.

The rice consists of four parts, the outermost layer is husk or husk, which is mainly composed of crude fiber and generally can not be eaten. The second layer is a cereal film which is rich in protein, mineral substances and a large amount of B vitamins and inorganic salts required by the human body although only a thin layer is formed; the rice is threshed and hulled to obtain brown rice, which is a complete rice fruit. In contrast, rice, which is commonly consumed by people, refers to processed polished rice, which is the endosperm part of rice seeds. The rice bran is the part discarded from the brown rice to the polished rice, and the mixture of the pericarp layer, the seed coat layer and the germ, which is removed from the brown rice in the polishing process, is mixed with a small amount of broken rice.

In the prior art, broken rice can be generated in the rice processing process, the grade is not improved, and the rice processing energy consumption is large.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a rice processing method capable of reducing energy consumption, which can reduce the amount of broken rice and remaining brown rice in the rice milling process and can also reduce the rice milling energy consumption.

A rice processing method for reducing energy consumption sequentially comprises the following steps:

(1) cleaning: the cleaning step mainly aims at removing various impurities in the rice, and specifically comprises the steps of screening to remove blighted grains, removing magnetic impurities in the rice by magnetic separation and removing stones;

(2) hulling rice: the main task of the rice hulling step is to remove rice hulls to obtain pure brown rice, and the rice hulls can be removed by a rice huller, preferably a winnowing system; rice and brown rice are separated in the rice hulling step, a flat-turn brown rice separating sieve is preferably used, a gravity brown rice separator can also be used, and the flat-turn brown rice separating sieve and the gravity brown rice separator are preferably used in series, so that the rice and the brown rice are separated more thoroughly, and the brown rice in the following rice is less and is easy to separate from polished rice;

(3) rice milling: the process of milling the brown rice into white rice is called rice milling. The machine for grinding the brown rice into white rice is called a rice mill, and a grinding wheel used for milling the rice in the rice mill is called a grinding roller;

(4) and (3) post-treatment: the post-treatment step comprises rice milling, rice cooling, rice grading and packaging, wherein the rice milling is to wipe off bran powder stuck on rice, and an iron roller rice mill is commonly used; the purpose of cooling the rice is to lower the temperature of the rice, and the rice is preferably cooled by using a fluidizing device; the aim of white rice grading is to remove broken rice in rice, and a roller concentrator is generally used for grading; and then packaging.

Before the rice milling in the step (3), the brown rice is preferably atomized by using water, so that the water content of the brown rice is increased to 14-16%, the friction coefficient of the brown rice can be increased, the peel layer of the brown rice is softened, the brown rice is easy to fall off with the rice, the amount of broken rice and left brown rice in the rice milling process can be reduced, and the energy consumption of the rice milling can be reduced.

The water is preferably added with cellulase, the concentration of the cellulase is 20-30mg/ml, the cortex hardness is reduced, the cortex fiber structure is locally damaged, the cortex is easier to remove, and broken rice generated in the rice milling process is reduced.

In the step (3), the brown rice is preferably atomized by the fluidized bed, so that the atomization is more uniform, and the processing effect is better.

The water in the step (3) is preferably broken rice water, the broken rice water contains nutrients such as protein, starch, mineral substances and the like, the weak acidity with the pH value of about 5.5 is presented, the cellulase can better play a role, husking is easier, and the breakage of brown rice is reduced.

The broken rice water is obtained by soaking broken rice in water for 5-10 minutes, and the weight ratio of the broken rice to the water is 1: 15-20.

The invention has the following beneficial effects: the flat-turn rice husking separating sieve and the gravity rice husking separator are connected in series for use during rice hulling, rice and brown rice are separated more thoroughly, the brown rice is atomized by using aqueous solution water of cellulase before rice milling, the amount of broken rice and left brown rice in the rice milling process can be reduced, and the rice milling energy consumption can be reduced.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.

The broken rice water in the embodiment is obtained by soaking broken rice in water for 10 minutes, and the weight ratio of the broken rice to the water is 1: 20.

Comparative example 1

A rice processing method sequentially comprises the following steps:

(2) hulling rice: hulling rice with a rice huller, and then connecting a flat-turn rice and brown rice separating sieve and a gravity rice and brown rice separator in series to separate rice and brown rice;

(3) rice milling: atomizing the brown rice with water in a fluidized bed before milling to increase the water content of the brown rice to 15-16%, and milling;

(4) and (3) post-treatment: grinding rice, grinding, cooling, grading rice, and packaging.

The amount of broken rice of comparative example 1 was 7.1%.

Example 1

(3) rice milling: atomizing brown rice with water solution of cellulose broken rice in fluidized bed before milling, increasing water content of brown rice to 15-16%, and cellulase concentration to 25mg/ml, and milling;

The amount of broken rice in example 1 was 4%, and the energy consumption in the whole rice processing process was reduced by about 10% compared to comparative example 1 without cellulase.

Example 2

(3) rice milling: atomizing brown rice with water solution of cellulose broken rice in fluidized bed before milling, increasing water content of brown rice to 14-15%, and cellulase concentration to 30mg/ml, and milling;

The amount of broken rice in example 2 was 4.2%, and the energy consumption in the whole rice processing process was reduced by about 10% compared to comparative example 1 without using cellulase.

Claims

1. A rice processing method for reducing energy consumption is characterized by sequentially comprising the following steps:

(1) cleaning: screening to remove blighted grains, magnetically separating to remove magnetic impurities in the rice and removing stones;

(2) hulling rice: hulling rice with a huller, and separating rice from brown rice after hulling rice;

(3) rice milling: grinding the brown rice into white rice by a rice mill;

(4) and (3) post-treatment: comprises the steps of rice polishing, rice cooling and rice grading and packaging.

2. The method for processing rice with reduced energy consumption according to claim 1, wherein the flat-turn grain separator and the gravity grain separator are used in series when the separation of rice and brown rice is performed in the step (2).

3. The rice processing method with reduced energy consumption according to claim 1, wherein the water used to atomize the brown rice before milling in the step (3) is used to increase the water content of the brown rice to 14-16%.

4. The method for processing rice with reduced energy consumption of claim 3, wherein the cellulase is added to the water at a concentration of 20-30 mg/ml.

5. The method for processing rice with reduced energy consumption according to claim 3, wherein the brown rice is fluidized by the fluidized bed in the step (3).

6. The method for processing rice with reduced energy consumption according to claim 3, wherein the water in the step (3) is crushed rice water.

7. The method for processing rice with reduced energy consumption of claim 6, wherein the water for crushing rice is obtained by soaking crushed rice in water for 5-10 minutes, and the weight ratio of the crushed rice to the water is 1: 15-20.