ใตรอธิบายให้ฉันฟังได้บ้าง
Oil deaeration
Degummed, bleached oil is deaerated prior to heating to deodorizing temperature to avoid oxidation and polymerization. It is accomplished in a separate external vessel connected to the vacuum system of the bleacher (50 mbar) or, at even lower pressure, in an integrated compartment of the deodorizer (Fig. 3). Some refiners add a bit of sparge steam to improve deaeration.
Heating and cooling
Heating of the oil is usually accomplished in two or more stages. To minimize the net energy cost, bleached oil is first pre-heated in one or two stages in a heat exchange device with either hot deodorized oil or steam.
The highest energy recovery (up to 85%) can be achieved in continuous deodorizers in which bleached oil is pre-heated indirectly with hot deodorized oil. This heat recovery usually takes place in a heat recovery compartment of the deodorizer, but it can also be realized in a separate, external heat exchanger. Both options have their pros and cons. External heat exchangers result in a high heat recovery and provide easier access for cleaning. On the other hand, heat exchange in the deodorizer ensures less product intermixing and less risk of fouling and it also takes place under vacuum.
The thermosiphon system is a special method of heat recovery that is used in semicontinuous deodorizers (Fig. 4). Steam produced in the oil cooling section flows in a closed loop to the oil pre-heating section. It will condense there and the water flows back to the cooling section. In this way, a heat recovery of 45-75% can be achieved, depending on the design of the thermosiphon system (single or double loop, with or without generation of low-pressure steam).
ใตรอธิบายให้ฉันฟังได้บ้างOil deaerationDegummed, bleached oil is deaerated prior to heating to deodorizing temperature to avoid oxidation and polymerization. It is accomplished in a separate external vessel connected to the vacuum system of the bleacher (50 mbar) or, at even lower pressure, in an integrated compartment of the deodorizer (Fig. 3). Some refiners add a bit of sparge steam to improve deaeration.Heating and coolingHeating of the oil is usually accomplished in two or more stages. To minimize the net energy cost, bleached oil is first pre-heated in one or two stages in a heat exchange device with either hot deodorized oil or steam.The highest energy recovery (up to 85%) can be achieved in continuous deodorizers in which bleached oil is pre-heated indirectly with hot deodorized oil. This heat recovery usually takes place in a heat recovery compartment of the deodorizer, but it can also be realized in a separate, external heat exchanger. Both options have their pros and cons. External heat exchangers result in a high heat recovery and provide easier access for cleaning. On the other hand, heat exchange in the deodorizer ensures less product intermixing and less risk of fouling and it also takes place under vacuum.The thermosiphon system is a special method of heat recovery that is used in semicontinuous deodorizers (Fig. 4). Steam produced in the oil cooling section flows in a closed loop to the oil pre-heating section. It will condense there and the water flows back to the cooling section. In this way, a heat recovery of 45-75% can be achieved, depending on the design of the thermosiphon system (single or double loop, with or without generation of low-pressure steam).
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