Countercurrent drying In the drying process, the drying driving force is relatively uniform, which is suitable for the drying of the materials to be dried. The dust carried by the drying medium is filtered through the wet zone, and the airflow contains less dust. (II) Selection and calculation of the cylinder dryer The selection of the cylinder dryer is mainly based on the characteristics of the material to be dried, such as the moisture content of the material, the particle size and the moisture of the dried product. In addition, should also consider economic factors, such as try to choose low-cost source of heat drying methods, drying methods such as the use of low-quality coal to boil the combustion chamber, while also considering the use of waste heat, and minimize material into the water before drying Wait. Where V 0 — the total volume of the dryer, m 3 ; Where n——— select the number of units, Taiwan; Where D———the diameter of the cylinder dryer, m;
While tetrasodium pyrophosphate is generally considered safe for consumption, it is important to note that excessive consumption may lead to health problems such as kidney damage and bone loss. Therefore, it is important to consume it in moderation and as part of a balanced diet.
Tetrasodium pyrophosphate (TSPP) is a white crystalline powder that is used as a food additive and in various industrial applications. It is a water-soluble salt that is composed of sodium cations and pyrophosphate anions.
In the food industry, TSPP is used as a sequestrant, emulsifier, and thickening agent. It is commonly found in processed meat products, canned seafood, and baked goods. TSPP is also used in toothpaste and other oral care products as a tartar control agent.
Food Grade Tetrasodium Pyrophosphate, Tetrasodium Pyrophosphate Industrial Grade Sichuan Jinhe Qihang Co,. Ltd. , https://www.jqfoodadditives.com
The indirect heating cylinder dryer is composed of a fixed concentric cylinder mounted outside the axis of the rotary cylinder and directly passes through the combustion chamber as a flue, so that the high temperature flue gas from the combustion chamber is from the concentric cylinder gap of the dryer. Passing, thereby drying the material in the inner cylinder; or in the central chimney peripheral multi-tube return pipe, so that the material of the outer cylinder is heated and dried by the reciprocating flow of hot air. As shown in Figures 6 and 7, respectively, due to the low heat transfer efficiency of indirect heating and complicated structure, the indirect heating cylinder dryer is rarely used. 
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The production capacity of the cylinder dryer is related to the moisture (calculated by the reset percentage) of the dried material entering and leaving the dryer and the drying strength. First, calculate the total volume of the dryer, the formula is as follows:
Q———Processing capacity of drying operation (kg/h according to the weight of solids in the dry matter section;
R 1 , R 2 — the moisture (in weight percent) of the dried material entering and leaving the dryer;
W S ——— Drying strength according to evaporation moisture meter, kg / (m 3 · h).
Dry strength is determined by actual production data for the test or drying of similar materials.
The dryer volume is related to the dry strength, the nature of the dried material, the moisture before and after drying, the temperature of the drying medium at the inlet and outlet of the dryer, the dryer type, the gas flow rate and the quality of the fuel. These factors are determined based on experimental studies and actual production data for drying similar materials.
Based on the calculated total volume, then the number of dryers selected is selected.
V 0 ——— Calculate the total volume of the required dryer, m 3 ;
V———Select a single volume of the dryer, m 3 ;
Determination of the diameter of the cylinder dryer:
β———full coefficient, β value generally takes 20%;
V 2 ——— volume of exhaust gas discharged from the dryer, m 3 /h;
υ 1 ———The airflow velocity at the outlet of the cylinder, m/s;
n———The number of dryers, Taiwan. See formula (2).
Rotary dryer (2)
Tetrasodium pyrophosphate is a food grade chemical compound that is commonly used as a food additive. It is also known as sodium pyrophosphate tetrabasic or TSPP. It is a white, crystalline powder that is soluble in water.
Tetrasodium pyrophosphate is used as a buffering agent, emulsifier, and thickening agent in various food products. It is commonly used in processed meats, seafood, and dairy products. It is also used in baking powders and cake mixes to help the batter rise.
In addition to its use in food products, tetrasodium pyrophosphate is also used in industrial applications such as Water Treatment, metal cleaning, and as a dispersing agent.