1. The low vacuum is too low to maintain the boiling point of the concentrate, and the temperature of the secondary steam is increased, thereby reducing the temperature difference between the heated steam and the concentrate, reducing the heat transfer and slowing down the evaporation rate of the steam, and heating the heating temperature of the material. , the preservation of the affected ingredients. The vacuum is too low, in addition to the impact of mass concentration, but also affects the production capacity of the equipment. The reasons for the low vacuum are as follows:
(1) Concentrate the equipment of each part into the air. Air adds an extra burden on the vacuum equipment and can cause malfunctions.
(2) Insufficient cooling water. In addition to the pump equipment, the lack of cooling water is mainly due to pipe blockage, resulting in valve damage. The amount of cooling water cannot make the secondary steam not condense in time, which seriously affects the operation of the vacuum equipment.
(3) The temperature of the cooling water is too high. When the cooling water enters the water temperature too high, a large amount of secondary steam generated by concentrated heating cannot be condensed in time, and the concentration of the equipment will be lowered.
(4) The use of steam pressure is too high. The heating steam pressure is too high to enrich the evaporation rate of the equipment, and a large amount of secondary steam production increases the load of the cooling equipment, and the vacuum is gradually reduced. Reducing the vacuum also increases the evaporation temperature of the material, while affecting product quality and equipment throughput.
(5) The vacuum equipment is faulty.
2, the vacuum is too high
(1) The temperature of the cooling water inlet of the concentrating equipment is too low, and the vacuum of the equipment is too high. Although high vacuum increases the temperature difference between the heated vapor and the boiling point of the material, heat transfer is increased and the evaporation rate is accelerated. However, since the latent heat of vaporization of the secondary steam increases as the degree of vacuum increases, the steam consumption is correspondingly increased.
(2) The evaporation rate is greatly lowered due to the low pressure or steam flow rate.
(3) In the apparatus using the soft drink separator, the condensed water is not discharged due to the clogging of the water separator, and the heater water is severe. In addition, if the quality of the heated steam is poor, or the insulation of the cold steam pipe is poor, and the water of the heater is severe, heat transfer is difficult, and the degree of vacuum is too high.
(4) The severe coking of the heater surface reduces the heat transfer coefficient of the heating surface, the evaporation speed is slow, and the vacuum degree of the pan exceeds the standard.
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