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Source:Shandong Haoweiyuan Foodstuffs Pty Ltd Date:2017-8-12
Prompt:Analysis of technical characteristics of dehydrated vegetables industry
According to the analysis of dehydrated vegetables industry in China, high temperature heat pump drying technology is the use of working fluid (refrigerant) vacuum evaporates in the evaporator, the evaporator surface temperature is lower than the indoor air dew point, so when the air flows through the evaporator by cooling down to below dew point, then the steam will be excess air on the evaporator surface condensation and precipitation, condensation water into the water after a draining pipe flows into the water container.
First, the basic concept of high temperature heat pump drying technology.
High temperature heat pump drying technology is the use of (refrigerant) vacuum evaporates in the evaporator, the evaporator surface temperature is lower than the indoor air dew point, so when the air flows through the evaporator by cooling down to below dew point, then the steam will be excess air on the evaporator surface condensation and precipitation, the condensed water into the water after a draining pipe flows into the water container. When the liquid working medium absorbs heat and is gasified, the condenser is sent into the condenser by the work of the compressor. Under the high temperature and high pressure, the condenser releases a large amount of latent heat of vaporization. In the evaporator cooling the air through the condenser, the temperature rise after absorbing heat, in the dry state and discharged into the indoor air mixing, thereby reducing the indoor air humidity, achieves the purpose of dehydration drying.
Two, dehydrated vegetables production status and problems
At present, dehydrated vegetable production mostly adopts the traditional methods of drying oven flue - Huilong heating drying method, it exists the following problems:
1, heating temperature is too high. Traditional process drying technology, heating temperature is not easy to control. Generally, the heating temperature is about 75-90 DEG C, and the drying process of dehydrated vegetables requires that the drying temperature should not exceed 65 degrees celsius.
2, drying time is too long. In the traditional way, every 1t vegetable needs at least 24h or more, even if it is occasionally reheated and dried because of the poor drying effect.
3, large energy consumption. The traditional drying process, the thermal efficiency is low, about 30%-60%, in the drying process, the drying evaporation heat accounted for about 36%, gas loss accounted for about 58%, dry material and heat dryer heat loss accounted for 2% and 2%, the thermal efficiency is only 40%.
Three, high temperature heat pump drying technology in the production of dehydrated vegetables advantages
Due to the unique characteristics of high temperature heat pump drying technology has been widely applied to the tobacco drying, pitaya, raisins, litchi, longan, hawthorn, red dates, walnut, medlar, mangosteen, nuts, meat, seafood, Chinese herbal medicine, jelly powder, Hanging noodles, dried persimmons, tea, chrysanthemum, honeysuckle, Ganoderma lucidum, letinous edodes, Cordyceps flowers and vegetables dry, Yuba, anise, food, wood, furniture, feed temperature, cocoon, rubber, coal, mineral sand, city sludge, biological fertilizer, leather, printing, fabric printing, fireworks beads, paper tube, mosquito coils, washing products, agricultural products, low temperature drying paint, metal and plastic accessories and other special industries, used for dehydration the advantages of the performance of vegetable production:
1 、 low heating temperature. The heat pump drying technology can be reduced by about 38-52 degrees more than the traditional drying process, and the heating temperature of the heat pump drying process is about 37 degrees celsius.
2 、 short drying time. High temperature heat pump drying dehydrated vegetable production process, the required time will not exceed 8h, generally from preheating to the product 4H can be completed.
3, good quality. The vegetables produced by high temperature heat pump drying process have better color and stable inner quality.
4, low energy consumption. As the process uses air circulation, the heating temperature is low, the drying time is short, and the capacity is large. Therefore, heat pump drying process less energy consumption, is a very good energy saving products.
Four, high temperature heat pump drying and traditional drying process, economic and technical indicators analysis
The test results show that the economic and technical indexes of the high temperature heat pump drying technology are much better than the traditional drying process, mainly embodied in energy saving, high quality, high efficiency and so on. Energy consumption comparison
The high temperature heat pump drying process: according to the test results, 1t processing of fresh vegetables, heat pump 2.75kW, circulating fan power consumption of 0.2kW, according to 4h 11.8kW, the energy conversion coefficient of standard coal 407g/ (kW - H), standard coal 4.803kg. The total energy consumption is 20kg+4.803kg=24.803kg (standard coal).
The traditional drying process: total consumption of standard coal 240kg, circulating fan power consumption 2.4kW, standard coal conversion coefficient 407g/ (kW, H), were converted to standard coal 0.977kg. The total energy consumption is 240+0.977=240.977kg (standard coal).
The calculation of energy saving rate: (1-24.803/240.977 * 100%=90%).
2, quality comparison. High temperature heat pump drying process, stable product quality, good color, no SO2 and other residual substances.
3. Comparison of drying efficiency. Adopting high temperature heat pump drying process, the product has qualified moisture content, no rework and short drying time.
According to the market investigation of dehydrated vegetables industry analysis report, high temperature heat pump drying equipment is put into use, the investment cost is relatively large, but a greater return, not only saves a lot of energy, but also improves the work efficiency greatly. High temperature heat pump drying process for vegetable dehydration is a technically feasible and economically reasonable energy saving project. This new technology and process are very successful from theory to practice.
 
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