Automatic drying line for dehydrated vegetables

DWP type high-efficiency energy-saving through flow circulating belt dryer is an advanced mesh belt automatic dryer. It has a number of invention patents (cn201910791408.8, cn201110059169.0). The application of these patented technologies has successfully solved the problems of uneven material drying and low drying intensity caused by uneven hot air distribution and hot air short circuit in ordinary belt dryer. This dryer with excellent performance is equipped with different mechanisms according to different vegetables, which can provide you with high quality and outstanding drying technology for almost all dehydrated vegetables. With its advanced automation and controller, this advanced machine can provide you with fast adjustment of processing technology of different varieties of products. It has the ability to remember drying process parameters and will provide you with constant output throughout the production season.

The heat source can be natural gas, steam, heat transfer oil and other heat sources. When natural gas is used, the machine has a full-automatic dryer with high-energy efficiency burner conforming to European standards, which can reduce labor demand, reduce production cost, and provide you with perfect drying effect every time.

When steam or heat transfer oil is used for heating, the control element adopts advanced pneumatic proportional control regulating valve and PID intelligent temperature control unit to stabilize the temperature control, so as to stabilize the drying process and reduce labor demand, so as to reduce the production cost, and provide you with perfect drying effect every time.

Features of production line:

1. The contact part of the physical department is made of stainless steel, which meets the hygienic requirements of green food and has a beautiful and generous appearance.

2. Industrialization, high degree of automation and large operation flexibility. The circulating fan, circulating air temperature, moisture discharge and mesh belt running speed of each unit can be adjusted independently.

3. There is no need for manual intervention in the production process. The materials are equipped with automatic turnover device in the whole drying process to eliminate secondary pollution.

4. Low labor intensity, good working environment, workers do not need to operate in high temperature environment (50 ~ 60 ℃).

5. Low energy consumption. Due to the adoption of jet penetration hot air circulation, the heat utilization rate is high, and the average heat required for drying per kilogram of water is only 4200kj / kgh20 (the heat demand per unit of water is related to various factors such as material variety and water existence form, which is for reference only).

6. Strong universality and wide adaptability. In order to meet the requirements of processing different materials, it can be added according to different material requirements, such as automatic screen washing device, automatic mixing unit, automatic turnover mechanism, etc. It can adapt to the drying and dehydration of a variety of agricultural and sideline products.

The heat source of the machine can adopt various heating methods such as natural gas hot blast stove, steam, heat transfer oil and so on.

If the natural gas hot blast stove is used for heating, the natural gas hot blast stove adopts the advanced high-efficiency and energy-saving burner with full-automatic proportional regulation operation. The burner meets the requirements of relevant standards for reducing pollution emission, and has passed the IP x0d (IP40) standard electrical protection level certification, as well as the en 676 European standard for gas appliances, EMC low voltage and boiler efficiency certification.

According to different environmental protection in different places, imported combustion engines meeting the emission standards of local environmental protection requirements shall be adopted, and the steady-state emission NOx of the hot blast stove of the machine shall not be higher than the rated emission value of the combustion engine, and the steady-state emission value of CO (O2): 0ppm; CH4 steady state emission value: 0ppm; The machine adopts a single proportional adjustment high-power combustor and an external hot blast stove for independent heating, which reduces the fault points, maintenance time and maintenance cost. At the same time, the external hot blast stove is separated from the dryer host, which improves the uniformity of hot blast, avoids the dust entrained in the circulating hot blast in the baking process from contacting with the high-temperature combustion area, and effectively prevents potential safety hazards.

The hot air passes through the air inlet duct to the electric damper of each drying room. Through digital accurate adjustment, the drying is more uniform and the product quality is better.

If steam or heat transfer oil is used for heating, each drying unit is equipped with a set of heat exchange system and control system. The control system uses advanced pneumatic proportional control valve combined with PID intelligent temperature control system to accurately control the drying temperature.

According to the drying process of different vegetable varieties, the air inlet, moisture exhaust and circulating air volume are adjusted through PLC program controller and drying parameters attached to the requirements to achieve better drying effect and achieve energy saving and consumption reduction.

Supporting institutions

Different vegetables and other agricultural products have different main components due to different varieties. According to different varieties, our company will support different special institutions to meet the special requirements of different varieties.

For example, for varieties with serious screen sticking, a scraper blanking mechanism will be equipped to solve the problem that the unclean screen sticking materials affect the quality after the second drying.

At the same time, according to different varieties, it can also be equipped with mesh sweeping device, mesh washing device and turnover mechanism, so that the production line can adapt to more varieties, higher drying efficiency and better drying quality.

The advantages of DWP dehydrated vegetable dryer include:

1. Due to the patented drying technology, the product quality can be maintained and the drying efficiency can be improved.

2. High degree of automation can improve work efficiency and the perfection of drying process.

3. Modern heat preservation technology, customized heat exchange system and controllable air circulator can provide highly uniform drying products.

4. It can store a variety of drying processes and has the function of intelligent screen control.

5. Different from other dryers, the patented drying technology invented by the company reduces the short circuit of hot air, improves the utilization rate of hot air, and greatly shortens the drying time, which is conducive to maintaining the original color and quality during the drying process of agricultural products.

6. Energy saving burners, reliable electronic equipment and control system are used for natural gas heating, which can help reduce manufacturing costs and improve profit margin. Steam or heat transfer oil is used for heating. Advanced pneumatic proportional control valve combined with PID intelligent temperature control system is used to make the temperature more accurate, reduce waste, save energy and reduce consumption.

7. The highly universal machine can handle the drying of various types of vegetables and other agricultural products.

8. The raw materials we use have been strictly examined and meet the national quality standards.

9. The machine adopts a self diagnosis system with automatic fault alarm.

10. The design meets the food production requirements and standards.

11. The machine is designed to be durable and can withstand heavy pressure.

12. The key components are made of SUS304 stainless steel known for its low carbon content, which means less carbide precipitation in the heat affected zone and lower sensitivity to intergranular corrosion.

Application characteristics of single-layer mesh belt dryer and multi-layer mesh belt dryer in drying dehydrated vegetables

Single layer belt type features:

① Our single-layer hot air contact drying with materials adopts jet flow mode, with high flow rate and strong penetration. Therefore, under the condition of thick material layer, it can ensure that the moisture from the drying room can be taken away quickly and forcibly. The drying intensity and drying speed are much higher than those of similar domestic equipment. At the same time, the drying speed of materials is accelerated On the premise of increasing the output, the color of the material will not be affected because the material layer is thick and the moisture cannot be taken away.

② The single-layer belt type is divided into several rooms from front to back. Each room controls temperature and humidity independently. Different temperatures and humidity can be adopted according to the drying needs of materials. It can be applicable to materials with various process requirements, especially those with requirements for the color of finished products.

Multi layer belt features:

① Our multi-layer belt type adopts bottom air inlet, the bottom layer is jet flow, the middle and upper layer is natural penetration, the hot air passes through the material layer layer layer by layer from bottom to top, and the materials run from top to bottom. The materials are dried in countercurrent mode from low temperature to high temperature; The drying intensity and drying speed are higher than those of similar domestic equipment. The effective drying area is large and the floor area is small. The price of equipment with the same output is slightly lower than that of single-layer belt type.

② The air inlet temperature of the lower layer of the multi-layer belt type is controllable, and the hot air temperature of the middle and upper layers is determined by the materials. The upper, middle and lower temperatures and humidity of different materials vary according to the water loss of the materials, but they cannot be set freely. The exhaust gas temperature is low, which is more energy-saving. It is suitable for the later drying of agricultural products with nearly balanced water at the end of connection, nut frying and materials with good air permeability, especially for materials with water loss in the early stage and need to be flavored and roasted in the later stage.

③ Defects of multi-layer belt type: due to the free penetration of hot air and easy short circuit in the upper and middle layers of multi-layer dryer, the paving material is thin, and the moisture between materials is not easy to take away due to low free penetration. During the drying process, the moisture in the middle and upper layers is easy to deposit in the materials, resulting in material browning. It is only suitable for redrying materials with color requirements such as dehydrated vegetables at the stage close to equilibrium moisture.