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A kind of decompression tower top vacuum pumping system and decompression method thereof

A technology of vacuum pumping system and decompression tower, which is applied in vacuum distillation, distillation control/regulation of hydrocarbon oil, etc., can solve the problems of insufficient cooling capacity of cooler, fixed consumption, decrease of vacuum degree at the top of decompression tower, etc. Achieve the effect of increasing the economic benefit of the device, solving the limitation problem and reducing the energy consumption of the device

Active Publication Date: 2017-12-22
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the jet steam evacuator has the characteristics of fixed (non-adjustable) pumping capacity and steam consumption, and cannot adjust the steam consumption of the steam evacuator in real time according to changes in processing raw materials and production operating conditions.
In the actual production process, take the actual operation of a certain atmospheric and vacuum device as an example. For example, the atmospheric and vacuum device adopts two series of parallel operation modes. The design load of one series of primary and secondary steam evacuators is 40%, and the other The design load of the primary and secondary steam evacuators of the series is 65%, and the main problems are: first, the crude oil processing load of the atmospheric and vacuum device needs to be between 68% and 84%, and the outlet temperature of the vacuum furnace is 370~378°C (decompression Furnace outlet design temperature is 383℃ according to deep drawing)
Therefore, the outlet temperature of the after-condenser must be reduced to reduce the load of the evacuator. In the actual production process, when the outlet pressure of the primary condenser is 11.83kPa and the after-cooling temperature is 46°C, the degree of vacuum will increase. The main reason is that under this pressure, the gas phase load contains water vapor and non-condensable gas components. According to Dalton's law of partial pressure, affected by the partial pressure of oil and gas, the saturated vapor pressure of water will be lower , which also causes the water at 46°C to still not reach full condensation
Therefore, a lower condenser outlet temperature is required to ensure high vacuum, and the post-condenser is cooled by circulating water, and the temperature of circulating water is greatly affected by the season. When the first and second evacuators on the top of the decompression tower are operated in a single series , due to the insufficient cooling capacity of the cooler, the problem of the vacuum degree at the top of the vacuum tower often drops

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  • A kind of decompression tower top vacuum pumping system and decompression method thereof
  • A kind of decompression tower top vacuum pumping system and decompression method thereof
  • A kind of decompression tower top vacuum pumping system and decompression method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] The process gas flow rate at the top of the vacuum tower of the device is about 5900kg / h, which mainly comes from the condensable gas / oil (2800kg / h), non-condensable gas (1000kg / h) and the vacuum furnace tube in the vacuum tower Steam injection and stripping steam (2000kg / h) is blown into the bottom of the decompression tower. The steam volume accounts for about 33.8% of the total gas flow. When the device encounters low processing capacity and decompression without deep drawing operation , the amount of condensable gas / oil and non-condensable gas in the vacuum tower is less, but since the amount of steam injected into the vacuum furnace tube and the amount of stripping steam at the bottom of the tower remain unchanged, the gas phase at the inlet of the first-stage evacuator on the top of the vacuum tower The load is relatively large, so the evacuator with a higher exhaust load must be selected for the first stage, and this part of the steam is at the outlet of the conde...

Embodiment 2

[0039] In order to reduce the back pressure of the first-stage evacuator, when the compression ratio of the first-stage evacuator remains unchanged, the effect of increasing the vacuum degree at the top of the decompression tower is realized. The following are two modes of reducing back pressure that can be realized by the present invention.

[0040] A possible mode of operation refers to the attached Figure 4 : Close the control valves on the first control valve 10 of the auxiliary pipe, the second control valve 12 of the auxiliary pipe and the first connecting pipeline 15, so that when the first-stage main steam evacuator 1 of the 65% suction load is operated in a single series, the matching 105% The secondary main steam evacuator 5 and the secondary secondary steam evacuator 7 of the air extraction load operate together.

[0041] Another possible mode of operation refers to the attached Figure 5 : close the control valves on the first control valve 9 of the supervisor, ...

Embodiment 3

[0047] The operation of the primary and secondary steam evacuators is greatly affected by the outlet temperature of the after-condenser. If the outlet temperature of the after-condenser of the first-stage steam evacuator is at 44°C, the saturated vapor pressure of water is 9.319kPa. If the outlet pressure of the condenser If it is 9.332kPa, the water vapor is not condensed, and it will be brought into the secondary evacuator and increase the gas phase load at the inlet of the secondary evacuator. When the outlet temperature of the condenser after the first-stage evacuator is 48°C, the saturated vapor pressure of water is 11.15kPa. Therefore, the outlet temperature of the after-condenser must be reduced to reduce the load of the evacuator. In the actual production process, when the first-stage When the outlet pressure of the condenser is 11.83kPa, when the temperature after cooling is 46°C, the vacuum degree will fluctuate and drop. The main reason for the analysis is that at th...

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Abstract

The invention relates to a pressure reduction tower top vacuum pumping system and a pressure reduction method thereof, and belongs to the technical field of atmospheric pressure and reduced pressure distillation. The pressure reduction tower top vacuum pumping system is characterized in that a paralleling steam evacuation pipe of the pressure reduction tower top vacuum pumping system is provided with three connecting pipes, and an inlet pipe of a first-stage steam evacuator and an outlet pipe of each stage of condenser are provided with control valves. Through the pressure reduction tower top vacuum pumping system, the pressure reducing method of three regulating modes comprising a first-main second-sub mode, a back pressure reducing mode and a cooling surface increasing mode of the steam evacuation pipe is changed. Through the above design, the first-stage steam evacuator and a second-stage steam evacuator on a pressure reduction tower top can not only run in a single row or two parallel rows, a new mode of single row cross operation can be realized, more operating conditions can be met by a more flexible way, and the purpose of saving steam and reducing the energy consumption can be achieved.

Description

technical field [0001] A vacuum pumping system and a decompression method for the top of a decompression tower belong to the technical field of atmospheric and vacuum distillation. Background technique [0002] The vacuum at the top of the vacuum tower in the atmospheric and vacuum unit of the refinery is a key factor in the vacuum distillation operation, which is closely related to the extraction depth of the vacuum distillation, the outlet temperature of the vacuum heating furnace, and the heat load. The power consumption of the vacuum system, including power steam consumption, electric energy consumption, water consumption and sulfur-containing sewage discharged, occupies an important position in the energy consumption of the crude oil atmospheric and vacuum distillation unit. The amount of steam and circulating water and electricity account for more than 10% of the total energy consumption of atmospheric and vacuum devices. At present, the equipment used for vacuuming t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/06C10G7/12
Inventor 于江涛
Owner CHINA PETROLEUM & CHEM CORP