Elimination of common faults of three-effect evaporators Due to changes in operating conditions, usage methods, etc., equipment often fails to operate normally, and even the concentration process is interrupted. Therefore, understanding the normal operating conditions and usage of the concentrating equipment is essential for equipment operation and maintenance personnel.
(1) The three-effect evaporator failed to operate. The low vacuum is too low to maintain the boiling point of the concentrate, and the temperature of the secondary vapor rises, thereby reducing the effective temperature difference between the heated steam and the concentrate, reducing heat transfer and slowing down the vapor evaporation rate, and heating the heating temperature of the material, Affect the preservation of active ingredients. The vacuum is too low, in addition to the impact of mass concentration, but also reduces 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. The penetration of air increases the additional burden on the vacuum equipment and can even lead to 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 is not enough to allow the secondary steam to condense in time, seriously affecting 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 rapidly reduced.
(4) The use of steam pressure is too high. The heating steam pressure is too high, which is not enough to enrich the evaporation rate of the equipment. The large amount of secondary steam production increases the load of the cooling equipment and gradually reduces the vacuum. Reducing the vacuum also increases the evaporation temperature of the material, affecting the quality of the product and ultimately reducing the production capacity of the equipment.
(5) The vacuum equipment is faulty.
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. While high vacuum increases the effective temperature difference between the heated vapor and the boiling point of the material, it is advantageous to increase heat transfer and accelerate the evaporation rate. 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 reduced due to the low pressure or steam flow rate.
(3) In the apparatus using the soft drink separator, the condensed water is discharged poorly due to clogging of the water separator, causing the heater water to be 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 inside 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 decreases, and the vacuum degree of the pan exceeds the standard.
3. Pour cooling water into the concentration unit
(1) Suddenly power off the vacuum to the pot than the vacuum system. At this point, the steam was not shut down in time, the vacuum in the pot was destroyed, and the vacuum system poured the cooling water into the condensing unit.
(2) In the normal operation sequence (the first vacuum device destroys the pot vacuum after the equipment is powered off), the vacuum in the pot is instantaneously higher than the vacuum system, and the cooling water is about to be poured out.
(3) Sudden failure of the vacuum equipment The pumping rate of the vacuum system drops sharply. In this case, no measures are taken to damage the vacuum in the pot, and the cooling water will be poured.
Heating surface coke
(1) When the concentration of the equipment is insufficient, the heating surface is not completely immersed in the material that opens the vapor valve, and the N, N-dimethyl-1,3-propanediamine has complete physical and chemical properties. The heated surface is exposed and coked. Sudden increases in steam pressure heating during production interruptions and sudden changes in operating conditions during production may result in severe heating of the heated surface.
(2) Do not operate in the order of parking. Do not turn off before heating the steam valve. First break the vacuum and lower the material level, causing the surface to heat and burn.
(3) Less than the amount of material and evaporation in the normal operation of the feed
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