Vacuum system energy-saving retrofitting Wen Wang, Er Liqin, Liu Xiaoguang, Henan Oilfield Refined Wax Factory Design Institute, Nanyang 473132, Henan, China. The decompression system has a low degree of vacuum and high steam consumption. Mechanical evacuation is used in place of steam injection, and the energy saving effect is significant after implementation. .
1 Introduction The annual throughput of the diesel refiner of the Refined Wax Factory of Henan Petroleum Exploration Bureau is 8,104. The device is designed to use the diesel non-hydrogenation technology of Tsinghua University. Its main purpose is to improve the quality of diesel fuel. The decompression system in the device is designed to recover the solvent of the refined diesel oil. The originally designed decompression vacuum process is a stage injection-grade cooling, and the power is. 0, 3 Superheated steam, low efficiency of the injector in the mountain, steam consumption is very expensive, the operating cost does not live. In August 2002, when the whole plant was overhauled and shut down, the use of a mechanical vacuum pump instead of a steam ejector was very effective.
2 Status Analysis 2.1 Refined wax refining plant Diesel refining unit Decompression system The original two steam ejector evacuators have a steam consumption of 1.5 per hour and account for 13 of the plant's steam consumption. At the same time, this part of the steam needs a large amount of cooling water to carry out. Cooling causes a huge waste of energy.
2.2 The steam jet pump is easy to clog, and the vacuum at the top of the tower is unstable, which seriously affects the safety of the device.
2.3 The steam is cooled by the cooler. 17 The condensed water contains some sulfone solvent. The solvent has a high volatility and is discharged into the device's compartment. The solvent smell overflows and the pollution of the ring is large. At the same time, the pressure of the sewage treatment system is increased. .
3 transformation of the contents of 3.1 mechanical vacuum pump to replace the steam jet pump for diesel refinery system pressure relief system overhead load, use type 15 mechanical vacuum pump to replace the original level of steam jet pump. The steam and solvent 3 towers out and are cooled by the overhead cooler and directly into the mechanical vacuum pump. With the mechanical evacuation process, the stage steam jet pump is deactivated and the two coolers behind the stage jet pump are also deactivated.
3.2 Expansion of vacuum pipe diameter for vacuum decompression In this modification, the inlet diameter of the mechanical vacuum pump is increased, so that the intake gas is too high, the pressure drop is reduced, and the mechanical defect is ensured.
Empty effect.
4 transformation effect 4.1 vacuum system to improve the degree of vacuum before the vacuum transformation, 89, after the transformation of the vacuum 4.2 decompression pull-out rate increase due to increased vacuum, refined diesel methyl sulfoxide recovery, the device solvent consumption The 3.51 diesel before the transformation of the mountain was reduced to 2.78 diesel, which could save a year. 561 4.3 The consumption of steam was significantly reduced. The overall energy consumption of the 1.51 unit of steam after reconstruction was reduced by 10 units.
4.4 Reduced cooling water consumption Due to the deactivation of the two chillers, the circulating water consumption of the unit is greatly reduced and the circulating water can be saved. 6 4.5 Conducive to environmental protection Steam condensate containing solvent is no longer discharged, the operating environment of the plant is improved, and sewage is reduced.
5 Economic benefits Sentence is small, saving steam 1.541 in the pump power consumption 22 circulating water per hour savings 60 also in line with the right to reduce the hourly 7 to calculate 8 per allowable branch 190,000 yuan, energy efficiency is very obvious,
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