A method for rapid replacement of modified asphalt after shutdown
A technology for modifying asphalt and asphalt, which is applied in the processing of tar asphalt/petroleum asphalt/natural asphalt, distillation processing of tar asphalt/petroleum asphalt/natural asphalt, petroleum industry, etc., and can solve problems such as clogging
Active Publication Date: 2020-10-27
鞍钢化学科技有限公司
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Problems solved by technology
[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for rapid replacement of modified asphalt after shutdown, which replaces the oil removal method of nitrogen purge and venting of modified asphalt. The oil stored in the pipeline is thoroughly cleaned, and the problem of large-area blockage of the pipeline caused by the original nitrogen purging pipeline is completely solved. The local deposition of pipelines in the upgrading process will cause hidden dangers that the start-up operation will not be smooth and the production will be shut down, so as to ensure the smooth operation of the upgrading process
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Embodiment 1
[0028] See figure 1 , a method for quick replacement of modified asphalt after shutdown, wherein the modified asphalt is replaced with dehydrated tar, which improves the replacement effect, and specifically includes the following steps:
[0029] 1) Connect the pipeline between the outlet of the dehydration tar heater and the inlet of the modified asphalt, figure 1 Shown is the modified asphalt feeding inlet connecting the modified asphalt 100 unit and the modified asphalt 200 unit, and the pipeline is equipped with a valve near the outlet of the dehydration tar heater, and the pipeline is separated before the modified asphalt feeding inlet of the two units is connected Two branch roads are formed to connect the inlet of modified asphalt, and valves are set at the connections, and nitrogen sweeping points are added on the pipelines.
[0030] 2) Before upgrading and stopping production, first reduce the feed amount of the upgrading process, and the output is normal, and reduce ...
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The invention relates to a method for rapid replacement of modified asphalt after shutdown of a modified asphalt procedure. According to the method, dehydrated tar is used for replacing the modified asphalt; a pipeline is led out from the outlet of a dehydrated tar heater of a dehydration tower and connected to medium-temperature asphalt and modified asphalt feeding inlets to form pipelines for replacement of the modified asphalt with the dehydrated tar; before shutdown of the modified asphalt procedure, the feeding amount of the modified asphalt procedure is reduced at first, a production volume is maintained normal, and the weights of a reaction kettle alpha and a reaction kettle beta used in the modified asphalt procedure are reduced to the minimum lower-limit weights of the productionof the modified asphalt; the dehydrated tar from the outlet of a heat exchanger of the dehydration tower is used for replacement of the pipelines, and replaced asphalt is allowed flow into an unqualified-asphalt tank; and sampling is performed at the lower part of a modified asphalt falling-film heat exchanger, and when a sample obtained after sampling is dehydrated tar, it is proved that the replacement is completed, so the replacement is terminated. The method of the invention has the advantage that the design of replacing the modified asphalt with the dehydrated tar is used for replacing aconventional nitrogen purging method, so problems in production and maintenance caused by non-thorough deoiling during the shutdown of the modified asphalt procedure are completely solved.
Description
technical field [0001] The invention belongs to the technical field of modified asphalt production, and in particular relates to a method for fast replacement of modified asphalt after shutdown. Background technique [0002] The tar operation area is a 300,000-ton tar processing operation area. The modified asphalt process is a supporting project that processes 12,000 tons of asphalt annually. It adopts a continuous reaction and is produced in a production mode heated by a tube furnace. High-quality bitumen free of sodium ions. [0003] The upgrading process has been in operation for more than 4 years since its inception. Every time the modified asphalt process is shut down, the modified asphalt pipeline needs to be purged. Entering modified asphalt 100 units and modified asphalt 200 units, the original French litwin company designed the oil removal method by nitrogen purge and venting. Due to the long pipeline and many turns, and the modified asphalt has easy coking and so...
Claims
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IPC IPC(8): C10C3/00C10C3/06
CPCC10C3/00C10C3/06
Inventor 徐志强张欣孙喜民
Owner 鞍钢化学科技有限公司