1. Equipment and technical measures (1) Equipment selection Freshwater fishing vessels are generally large, with a volume of 80-100 cubic meters. Depending on the storage capacity of the refrigerator, the refrigeration equipment can be selected, and the imported Japanese marine refrigerator can be selected. The power is suitable for 10-15kw. One ship is equipped with one auxiliary equipment: one 15kw electric motor, two 15kw generators (one spare), and 20kw diesel engine 1 set; stainless steel seamless pipe for cooling pipes; water-cooled cooling system. (2) Installation requirements 1 Technical renovation of the existing fresh-keeping storage warehouse (The insulation layer of the wooden fishing boat fresh-keeping warehouse is generally protected by a 15cm-thick foam material plus a 5cm thick wood board). It needs a technically-thickened thick insulation thickness of 25cm plus an 8cm-thick plywood board protection. Layer, and then sealed with galvanized sheet to enhance the tightness of the fresh-keeping compartment. 2 The cold-carrying pipe adopts a thick seamless stainless steel pipe, which is evenly distributed around the warehouse wall and at the top of the warehouse when installed. 2. Preservation Principle Based on the traditional ice preservation mode, the application of refrigeration technology was introduced to develop micro-freezing and micro-ice preservation technology, scientifically control the temperature of fresh-keeping warehouses, catch preservation and preservation of fresh ice, and improve freshness. 3. Achieving technical indicators A pair of 425 kW twin-drag boats was selected by the Qinzhou Fisheries Technology Extension Station. The above-mentioned refrigeration equipment was tested and used. The trial production started in August 2001 and was accepted in December 2001. The following experiences were obtained: (1) Savings of fishing boats With ice 60%, save 30 tons of ice before comparing the voyage before installation. (2) Fresh-keeping temperature. The temperature can be reduced to -15°C. The production experience shows that with the temperature controlled at -8°C~0°C, the catch quality is better, and the characteristics of the scattered ice fish can be maintained. Market sales are marketable. (3) The catch preservation rate reached 100%. Compared with the pre-installation increase of 20%, general fresh ice trawlers catch only 80% of the catch, about 20% of low-value salted fish. (4) The fresh-keeping quality of the catches all reached the first-grade preservation degree, and the fresh-keeping characteristics of the preserved ice were preserved, and the freshness was significantly improved. (5) Prolong the period of catch preservation, and the voyage operation time can reach 40d or even longer, which improves the operating efficiency. 4. Summary This technology is based on the traditional preservation technology, applied refrigeration technology, developed to micro-frozen and micro-ice preservation technology, and achieved the purpose of retaining the characteristics of fresh ice preservation and improving the freshness. It also saved costs and extended freshness. During the period, the fishing boats will be able to increase the production capacity of deep-sea fishing vessels, have little investment in equipment, be easy to operate, be easy for fishermen to use, and have guaranteed equipment warranty services. They are very suitable for the production of local high-powered mass fishing boats. Faced with the demarcation of Beibu Bay in the future, local fishing grounds will be greatly reduced, and high-power fishing boats can only expand their way out into the deep sea. High-power fishing boats gradually promote the use of refrigeration technology, improve the preservation technology, and develop fishing boats for fisheries in Nansha and even offshore fishing grounds for people fishing boats. Has a promoting effect
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High-power fishing boat refrigeration and fresh-keeping technology
The high-power trawler operation area is generally a deep sea, and the voyage operation time is about 15-20 days; if it goes to the Nansha fishing ground, the voyage operation time will be as long as 30-40 days. High-power trawlers have strong operating capacity, long continuous operation time, and high catches, which require fishing vessels to have strong preservation capacity in order to ensure the preservation quality of the catches. The traditional method of ice preservation with fishing boats has the disadvantages of large amount of ice, short shelf life, and unsteady quality of fresh fish catchment, which is insufficient to meet the needs of continuous operation of deep sea fishing vessels. The fishing boats in our area often go to Nansha fishery. The Nansha fishing ground is very far away. The fishing boats for the people are mostly operating in ice mode. The fishing boats return from production. Although the fish catches are fully loaded, the fresh ice stored in the fish tanks has long since melted and the quality of the fresh fish has been greatly reduced. This is because high-quality fish can't sell for a good price, and the economic benefits can't be reflected. It seriously affected the enthusiasm of fishermen to develop Nansha fishery production. In order to solve the problem of high-power fishing vessels operating in deep seas for long periods of time and difficulties in catching fresh fishes, it is recommended that cooling and preservation technologies be used for reference by high-power mass fishing boats.