Calcium Hydrogen Phosphate

1. Material Overview

Calcium hydrogen phosphate (also known as dicalcium phosphate) is a compound that usually exists as dihydrate (its chemical formula is CaHPO4 · 2H2O), but can be converted to anhydrous form by heating.

Calcium hydrogen phosphate can be used as buffer, leavening agent, dough improver, nutritional supplement, yeast feed, emulsifier, curing agent, antioxidant synergist, and stabilizer. It is used in products such as cherry filling canned goods, milk powder, cream powder, frozen drinks, ice cream, potato products, snack foods, flour, cakes, pastries, and as a baking quality improver.

2. Process Introduction

Calcium hydrogen phosphate from the upstream section is sent into mixer to premix with the return material, and then it is fed into the rotary dryer. The dryer is at a certain angle with the feed end higher than the discharge end. Then it comes into direct contact with the internal hot air to complete heat and mass transfer. The dried product is discharged from the bottom of the discharge hood.

3. Technical Advantages

1) High-efficiency heat transfer

The rotating cylinder drives the material to move evenly with counter-current contact between flue gas and material, ensuring sufficient heat and mass transfer and stable drying efficiency.

2) Mature structure

Utilizing the mature structure of conventional rotary dryer, it consists of core components such as the cylinder, support roller, and transmission device. There are no complex additional mechanisms, resulting in fewer vulnerable parts, lower failure rate, and suitability for long-term continuous operation.

3) Flexible operation

It can process materials in various forms, including granular, lumpy, and powdery materials, and it is highly adaptable to fluctuations in material moisture content. By adjusting the cylinder speed and flue gas flow rate, different drying requirements can be flexibly matched.

4. Technical Benefit

1) Significantly reduced operating costs

Industrial waste heat flue gas is used as direct heat source, significantly reducing the consumption of additional energy sources such as steam and electricity. The heat utilization cost is reduced by more than 30% compared to hot air drying method only, resulting in outstanding long-term energy savings.

2) Stable product drying quality

The rotating cylinder ensures uniform heating of the material without local over-drying or under-drying problems. It can ensure high consistency in the moisture content of the finished product, reduce losses from defective products and provide material compatibility for subsequent production stages.

3) Easier investment and maintenance

It has a simple structure and mature technology, with lower procurement and installation costs than dedicated drying equipment. It has fewer vulnerable parts, simpler maintenance process, and shorter downtime for repairs. It is also suitable for industrial waste heat recovery scenarios, eliminating the need for additional heat source systems and shortening the project investment payback period.