According to pipeline medium requirements and environmental temperature changes
The characteristics of the denitrification system in the new zone (1) The key equipment of the denitrification system, the bottom part of the electro-refining sedimentation tank body material that contacts the tail oil (the lower head and the 600mm high cylinder connected to it) is 316L, and the other parts are 16MnR. This is the same kind in China Compared with the material of the electro-refining sedimentation tank of the device is all 316L, the cost is reduced by about 40%, and it fully meets the production requirements. (2) The denitrification agent tank and tail oil tank are made of 16MnR lined with epoxy resin, which meets the anti-corrosion requirements of the process from the operating conditions (the control temperature does not exceed 100e), and the materials of the two tanks of similar domestic devices are all 316L, higher cost. (3) The denitrification agent unloading pump and the tail oil loading pump share a screw pump, which not only reduces the equipment investment, but also reduces the floor space of the pump. It is more appropriate for the new land occupation of the technological transformation project to be restricted. (4) Due to the low freezing point of the denitrification agent (not higher than 20e) and the low temperature in winter in the northeast, the denitrification system adopts steam and hot water tracing methods, which can be flexibly adopted according to the requirements of pipeline media and changes in ambient temperature. Hot water or steam tracing method.
Denitrification agent The WSQ-2 denitrification agent used in this denitrification system is produced by Wuhan Hannan Jinhe Petrochemical Co., Ltd. Operation status and analysis of the denitrification system 3.1 The nature of the denitrification feedstock and the changes in alkali nitrogen and sulfur content before and after denitrification The denitrification system was put into operation in mid-November 2000. In order to reduce the denitrification effect of the second-line HVI150 oil with different agent-to-oil ratios, the average denitrification rate under the condition of the agent-to-oil ratio of 1B451 is 63%, and the total denitrification rate reaches about 74% after refining with clay; the agent-to-oil ratio drops to about 74%. At 1B485, the denitrification rate is about 49%, and the total denitrification rate is about 70% after refining with clay. Compared with the denitrification effect of 1B451, the total denitrification rate is reduced by about 14%, and the base oil rotary oxygen bomb It is only 5min higher than the control index, so it can be considered that when the raw material is alkali nitrogen [email protected], the agent-to-oil ratio of 1B485 is close to the minimum limit of adding denitrification agent. From the perspective of the total nitrogen removal effect, the addition ratio of white clay of 1.04% is also close to the lowest limit.
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