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    Analysis of technical characteristics of dehydrated vegetable industry

    2016/8/30??????view:

    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. Analysis on technical characteristics of dehydrated vegetable industry in China in 2015.

    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. The liquid working medium endothermic gasification, into the condenser by the compressor work, a large number of latent heat release condenser under high temperature and high pressure. 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 vegetable production status and existing 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, the heating temperature is too high. The traditional technology of drying technology, heating temperature is not easy to control. General heating temperature is about 75-90 degrees, and the dehydration of vegetable drying process requires a temperature of not more than 65.
    2, the drying time is too long. Using the traditional method, each processing 1t vegetables need at least 24h above, even if so occasionally also due to the drying effect is not good to rework and re heating drying phenomenon.
    3, 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
    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. Heat pump drying technology production process than the traditional drying technology to reduce 38-52 degrees Celsius, heat pump drying process of the heating temperature of about 37 degrees celsius.
    2, the drying time is short. High temperature heat pump drying dehydration vegetable production process, the required time is not more than 8h, generally from pre heating to the product 4H can be completed.
    3, good quality. With high temperature heat pump drying process of the production of vegetables, the product of good color, intrinsic quality and stability.
    4, low energy consumption. Because the process uses air circulation, the heating temperature is low, the drying time is short, and the capacity is large. So 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 index analysis
    Test results show that the high temperature heat pump drying technology of various economic and technical indicators are significantly better than the traditional drying process, mainly in energy saving, high quality, high efficiency, etc.. 1, 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. 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. 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 contrast. High temperature heat pump drying process, product quality is stable, the color is good, no SO2 and other products have dew residue.
    3, drying efficiency comparison. High temperature heat pump drying process products, moisture content is qualified, no rework phenomenon, and the drying time is shorter.
    Five, comprehensive evaluation
    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 production, is technically feasible, economically reasonable energy-saving projects, this new technology, new technology from theory to practice, are very successful.

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