Spray drying device A spray dryer is a dryer for processing solutions, suspensions or slurry-like materials. The spray dryer uses a spray method to make the material into mist droplets and disperse in the hot air flow. The material and the hot air are in contact with each other in a cocurrent, countercurrent or mixed flow mode, so that the moisture quickly evaporates to achieve the purpose of drying. With this drying method, chemical unit operations such as concentration or filtration can be omitted, and granular products of 30-50up can be obtained, and the drying time is extremely short. The general drying time is 5-30s. The spray dryer is suitable for the drying of highly heat-sensitive materials and materials that are easily decomposed during the concentration of the material liquid. The product has good fluidity and instant solubility. In the spray dryer, the gas-solid two-phase contact surface area is large, but the gas-solid two-phase dilute ladder phase flows, so the volumetric heat transfer coefficient is small, generally 23-116, and the hot air temperature is 250-500 degrees Celsius when co-current operation, counter-current operation The time is 200-300 degrees Celsius. For industrial scale spray dryers, the thermal efficiency is generally 40% -50%. Foreign spray dryers with waste heat recovery can achieve a thermal efficiency of 70%. This spray dryer is more economical only when it has a production capacity greater than '100kg (water) / h.
The spray-dried products are fine particles. In order to meet the requirements of environmental protection laws and regulations, it is not enough to use a cyclone to separate the product and purify the exhaust gas in the spray dryer system. Generally, a bag-type dust collector is also used to purify the dust in the exhaust gas. The amount of gas is less than 50 (standard state), or a wet scrubber can be used to reduce the dust content of the exhaust gas. The traditional LPG high-speed centrifugal spray dryer has been selling well in the chemical industry since the first half of the year. The current configuration is higher and the technology is higher. ZLPG-type Chinese traditional medicine extract spray dryer and TPG-type intelligent seasoning spray dryer, which require more precision, are increasingly showing their advantages in the market, and they are purchased by the majority of pharmaceutical factories and food factories.
The technical equipment for the processing of ceramic raw materials has not been a breakthrough for many years. In the production process of the powder, the spray dryer realizes an unmanned monitoring system, which can pass the key data of the inlet and outlet air temperature, air volume, mud pressure and moisture in the spray dryer through processing software to analyze the real-time changes that cause the system Factors, and can simulate the manual operation to adjust the temperature of the hot blast stove, the slurry flow rate, etc., and ultimately replace the human operation. In terms of improving the utilization rate and quality of powder, a spray tower powder cooler that can quickly cool powder temperature and control powder humidity is introduced.
In the past two years, the spray dryer of China's ceramic machinery enterprises has taken a leap forward in the use of fuel. The switch from the original oil burning to the use of coal water slurry as a clean energy has not only saved fuel costs, but also reduced Pollution of the atmosphere. Spray dryer is one of the main process equipment of ceramic enterprises. The energy consumption of this link accounts for a large proportion of the total energy consumption of the production line. The cost of using coal water slurry can reduce the cost by 20% compared with oil burning. It is popularized and used very quickly, and its consumption far exceeds the value of the power industry in just over a year, and it has become the leading industry of coal water slurry instead of oil.
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