Heavy dirty oil recycling process
A technology for heavy dirty oil and dirty oil, which is applied in the direction of multi-stage serial refining process treatment, etc., can solve the problems of high treatment cost, long recovery period, large steam volume, etc., to avoid waste of resources, good dehydration effect, and investment. low cost effect
Inactive Publication Date: 2011-08-03
胡勇刚 +1
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Problems solved by technology
[0005] The characteristics of the heating static sedimentation separation method are: it can accept heavy dirty oil of any concentration, the process is simple and easy to operate, and the investment is small; its disadvantages are: long recovery period, the settling period is generally more than 24h, large steam volume, high energy consumption, and recovery The oil contains more water, which is not conducive to the re-refining of heavy dirty oil
[0019] The water content of heavy dirty oil can be reduced by adopting the above related processes, but at the same time, it also increases the process flow, one-time equipment investment, equipment land space, etc., and the treatment cost is very high
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] Such as figure 1 As shown, the contact cooling tower used in this example is common equipment in oil refineries. The length-to-diameter ratio of the tower is 8:1, there are 8 to 12 trays inside, and the device capacity is 250,000 to 300,000 tons / year . The average water content of the re-refined fresh heavy dirty oil in this embodiment is 20% (volume fraction).
[0034] The heavy dirty oil refining process comprises the following steps:
[0035] 1. When starting to work, introduce the initial heavy dirty oil into the contact cooling tower. When the liquid level of the initial heavy dirty oil at the bottom of the contact cooling tower reaches 60%, start the circulation pump at the bottom of the tower to send the initial heavy dirty oil to the bottom of the tower. Boiler heat exchange, the initial heavy dirty oil after heat exchange re...
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The invention relates to a heavy dirty oil recycling process, which is characterized by comprising the following steps of: (1) after starting working, establishing a 50-80 percent initial heavy dirty oil tower bottom liquid level in a contact cooling tower, feeding initial heavy dirty oil into a tower bottom reboiler for heat exchange by using a tower bottom circulating pump, returning to the contact cooling tower from the upper side of the initial heavy dirty oil in a tower bottom and establishing a tower bottom temperature of between 150 DEG C and 160 DEG C; and (2) fully mixing fresh heavy dirty oil with the tower bottom heavy dirty oil by using a static mixer to obtain an upward refluxing material of the contact cooling tower, establishing a tower top temperature of between 110 DEG C and 120 DEG C, making the fresh heavy dirty oil in the contact cooling tower flow downwards from top to bottom along a tower disk, reversely contacting the fresh heavy dirty oil with oil gas evaporated from the tower bottom for gas-liquid two-phase heat exchange, discharging moisture absorbing heat in the heavy dirty oil out of the top of the contact cooling tower in the form of water vapor, conveying into a downstream procedure, and precipitating dehydrated heavy dirty oil at the tower bottom to obtain a heavy dirty oil recycled product. Compared with the prior art, the invention has the advantages that: the heavy dirty oil can be recycled through simple temperature control by using the conventional equipment in an oil refinery without any catalyst, the heavy dirty oil dehydrating effect is good, and the benefit is high.
Description
technical field [0001] The invention relates to a heavy dirty oil refining process. Background technique [0002] A certain amount of heavy dirty oil is produced in the process of petroleum refining. These heavy dirty oils come from a wide range of sources, such as cutting water from crude oil tanks, top reduction tanks, equipment shutdown for cleaning lines, equipment cleaning, electric refining, etc. . The properties of heavy dirty oil produced in different processes are very different, and the form of heavy dirty oil is also complex, such as oil-in-water type, water-in-oil type or multi-layer coating, etc., serious emulsification, and strong oil-water interfacial tension . At present, there are mainly the following methods for oil-water separation of heavy dirty oil: [0003] 1 Heating static sedimentation method [0004] The separation principle of heating static sedimentation method is mainly to use the density difference between oil and water and the incompatibilit...
Claims
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IPC IPC(8): C10G53/02
Inventor 胡勇刚孙宇
Owner 胡勇刚