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Application of heat pump dryer in drying pepper

2017-12-03
Pepper dryer.Jpg
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Overview of pepper drying:

Pepper harvest season. It is the rainy season. Under normal circumstances, the frequency of autumn rain is more than 70% to 80%. If it cannot be dried in time, the phenomenon of mildew is very serious.
There are two traditional methods of drying, one is to bind manually one by one. Then it is hung on the coal fire for a long time. The other method is the above two conventional drying methods. The pepper has poor quality, yellow flowers and white shells, large pollution, high labor intensity, and small processing capacity.
In recent years, drying technology has been gradually promoted in China, and technologies and machinery such as earthenware, far infrared, and dryers have developed rapidly. However, to achieve the purpose of good drying quality and low cost, the drying process must be carefully studied.

Stacking thickness:
The stacking thickness of peppers should be one to one, generally 20-30 cm is appropriate. The stacking is too thin, the air permeability is good, and the wind resistance is small. However, the contact time between hot air and pepper is relatively short, and the heat utilization rate is low. If stacked too thick. The resistance increases too, and hot air cannot penetrate the layer. Selection of temperature with poor drying effect:

How the hot air temperature value of pepper drying is related to the spicy quality and drying efficiency, try to analyze the ingredients of pepper and the situation that several main ingredients are affected at a certain temperature.
500 grams of various kinds of nutrition ingredients in hot pepper products:
Protein 4.5 g Iron 2.2 mg
Fat 0.6 g Carotene 2.04 mg
Sugar 12.1 g Thiamine 0.11 mg
Calories 75 kcal 0.8 mg Nicotinic acid
Calcium 34 mg Riboflavin 0.08 mg
Phosphorus 112 mg Ascorbic acid 518 mg Pepper contains ten main nutrients. Among them, some ingredients are easy to be lost and destroyed under high temperature. In order not to reduce the nutritional ingredients, it is not suitable to choose a higher hot air temperature.
The moisture content of pepper raw materials is very high, usually 75% to 85%. Dry with hot air at 40-60 ° C. At first, the relative temperature of the exhaust gas is lower than 70%. After 5 hours, the relative humidity of the exhaust gas drops below 52%. After 12 hours, the relative humidity of the exhaust gas is lower than 40%.
It can be seen that the precipitation rate of peppers is under the control of internal water transfer most of the time. Therefore, the productivity of pepper drying operations is mainly determined by the temperature of the peppers, not the hot air humidity and dehumidification capacity. The nutritional content of the peppers will not be affected and the productivity will be comprehensively considered. The hot air temperature of roasted peppers should be 60-70 ° C.
Selection of drying media:
Chili for food. The pollution requirements are strict. If anthracite and coke are used as fuel, the direct heating method will cause serious pollution. So choosing safer and pollution-free equipment is also critical for pepper drying.

Drying process of pepper dryer:
Segmented drying is currently a superior method for drying peppers, that is, peppers with a moisture content of 75% to 85%, dried for the first time to a moisture content of 50%, step on the pile and sweat, and then perform a second drying after sweating. Stepping on the pile and sweating: It is an important step in the drying process of peppers. Whether to use this step has a great impact on the quality of peppers, the drying time and the amount of drying. There are obvious softening and swelling phenomena during the drying process. The main role of sweating on the pile is to quench and temper, to make the pepper oil penetrate to the surface, and the dried peppers have the same color, ruddy and smooth, and promote the moisture content of the pepper to balance. If you do not sweat on the pile, drying 1,000 kilograms of pepper, it takes 63 hours to heat the hot air at 40-60 ° C. After you step on the pile, you can shorten it to about 40 hours, and the yellow shell of the flower is significantly reduced. When the peppers are sweating on the pile and enter the second drying, it should not be turned too much, otherwise the damage rate of the peppers will be increased and the sales price will be reduced.
Due to the different quality and maturity of peppers, some peppers that cannot be dried in the first drying operation should be selected and re-dried.
Machine selection:
Jibei high temperature heat pump drying and dehumidifying integrated machine is particularly suitable for use in pepper drying. Jinkai dryer can achieve ** temperature control, easy operation, and no pollution to the environment and materials. It uses air heat and saves energy more than other equipment. . Performance characteristics of Jibei heat pump dryer:
1) Convenient installation: convenient installation and demolition, small floor space, can be installed indoors and outdoors;
2), ** energy saving: only need to consume a small amount of electrical energy, you can absorb a large amount of heat in the air, the power consumption is only 1/3 to 1/4 of the heater; same as coal, oil, gas drying equipment Compared with this, it can save about 75% of the operating costs. 1 kWh is equal to 4 kWh.
3), environmental protection and no pollution: no burning matter and emissions, fully comply with food hygiene standards, is a sustainable development of environmentally friendly products.
4) Safe and reliable operation: The entire system operates without the dangers of flammable, explosive, poisoning and short circuit that may exist in traditional dryers (fuel, gas or electric heating). It is a safe and reliable fully enclosed dry system.
5) Long service life and low maintenance cost: It is developed on the basis of traditional air-conditioning technology. The process technology is mature, the performance is stable and reliable, and the service life is long. The operation is safe and reliable, fully automatic without manual operation, and intelligent control. .
6), comfortable and convenient, high degree of automation and intelligence: automatic temperature control device, continuous drying operation for 24 hours.
7) Wide range of application, not affected by climate: it can be widely used in heating and drying operations in food, chemical, pharmaceutical, paper, leather, wood, agricultural and sideline products processing industries


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