GB/T 21017-2021Technical specifications for maize drying (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 21017-2007 "Technical Specifications for Corn Drying". Compared with GB/T 21017-2007, except for structural adjustments and In addition to the editorial changes, the main technical differences are as follows.

---Increase the value of cracking rate, the value of broken rate, the value of fatty acid, the rate of seed germination, the value of obviously discolored grains, the unevenness of drying, Terms and definitions of silty corn and hard corn (see 3.1, 3.2, 3.3, 3.4, 3.6, 3.7, 3.8, 3.9);

---The terms and definitions of crack rate and thermal damage have been deleted (see 3.1 and 3.3 of the 2007 edition);

---Adjusted the requirements for separate temporary storage, separate drying, and moisture unevenness of raw grain corn (see 4.1, 2007 edition 4.1);

---Adjusted the requirements of dryers and personnel (see 4.2.1, 4.2.2, 4.3.2, 4.2 and 4.3 of the 2007 edition);

---Adjusted the allowable heating temperature of corn (see Table 1, Table 1 of the 2007 edition);

---Adjusted the drying process (see 5.2.1, 5.2.2, 5.2 in the 2007 edition);

---Adjusted the drying process parameters (see Table 2, 5.3 of the 2007 edition);

---Added dryer flue gas emission requirements (see 5.4);

---Adjusted the drying quality index requirements (see Table 3, Table 3 of the 2007 edition);

---Inspection methods have been added (see Chapter 7);

---Adjusted the safety requirements (see Chapter 8, Chapter 6 of the 2007 edition).

1 Scope

This document specifies corn drying terms and definitions, basic requirements, drying technical requirements, drying quality, inspection methods, safety requirements, etc. content.

This document is applicable to different types of dryers with drying, slowing and cooling drying processes that use hot air as the medium for drying for different purposes Corn kernels.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB 1353 corn

GB/T 3543.7 Crop Seed Inspection Regulations Other Inspection Items

GB/T 5262 General Rules for Testing Conditions of Agricultural Machinery

GB/T 5492 Grain and oil inspection Appraisal of color, odor and taste of grain and oilseeds

GB/T 5494 Grain and oil inspection, impurity and imperfect grain inspection of grain and oilseeds

GB/T 5498 Grain and oil inspection bulk density determination

GB/T 5520 Germination test for grain and oil inspection

GB 10396 General rules for safety signs and hazard graphics for agricultural and forestry tractors and machinery, lawn and garden power machinery

GB 13271 Boiler Air Pollutant Emission Standard

GB/T 14095 Technical Terminology for Agricultural Products Drying

GB/T 16714 continuous grain dryer

GB/T 20570-2015 Maize Storage Quality Judgment Rules

JB/T 13628 Circulating grain dryer

NY/T 370 Technical Specification for Quality Evaluation of Seed Dryer

3 Terms and definitions

The following terms and definitions defined in GB/T 14095 and GB 1353 apply to this document.