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Catalytic cracking fractionating tower oil gas energy-saving apparatus and operation technique

An energy-saving device and catalytic cracking technology, applied in the petroleum industry, recovery of liquid hydrocarbon mixtures, etc., can solve the problems of consumption of cooling water, electricity and other public works, low-temperature heat sources can not be effectively used, etc., to achieve the effect of reducing consumption

Inactive Publication Date: 2009-08-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the condensing and cooling process of oil and gas at the top of the main fractionating tower, a large amount of latent heat of condensation and sensible heat of cooling is taken away by air or cooling water, not only the low-temperature heat source cannot be effectively utilized, but also a large amount of cooling water, electricity and other public works are consumed

Method used

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  • Catalytic cracking fractionating tower oil gas energy-saving apparatus and operation technique
  • Catalytic cracking fractionating tower oil gas energy-saving apparatus and operation technique
  • Catalytic cracking fractionating tower oil gas energy-saving apparatus and operation technique

Examples

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Effect test

Embodiment 1

[0023] Example 1: A new technology for the recovery of low-temperature heat and energy-saving energy in the three-stage compression system of the oil-gas air compressor at the top of the fractionation tower of the catalytic cracking unit, such as figure 2 The structure and connection method shown.

[0024] The oil vapor temperature at the outlet of the heat exchanger of each compression system is 70℃~96℃; the operating pressure of the public low pressure desorption tank is 0.2MPa~0.4Mpa; the gas pressure at the outlet of the air compressor is 0.4MPa~0.8MPa, 0.6MPa~1.1 respectively MPa and 1.3MPa~1.7MPa.

[0025] Taking a refinery with a catalytic processing capacity of 0.4Mt / a as an example for simulation, the flow rate of oil and gas (1) at the top of the main fractionating tower is 50000kg / h and the temperature is 110℃. The top oil and gas (1) flowing out from the top of the main fractionation tower will enter the gas-liquid balance tank (3) for liquid separation after recoveri...

Embodiment 2

[0026] Example 2: A new technology for recovering low-temperature heat and energy-saving energy in the two-stage compression system of an oil-gas air compressor at the top of the fractionation tower of a catalytic cracking unit, such as image 3 The structure and connection method shown.

[0027] The temperature of the oil vapor at the outlet of the heat exchanger of each stage of the compression system is 70℃~96℃; the operating pressure of the public low pressure desorption tank is 0.2MPa~0.4Mpa; the gas pressure at the outlet of the air compressor is 0.4MPa~0.9MPa and 0.8MPa~1.7 respectively MPa.

[0028] On the basis of embodiment 2, the three-stage air pressure machine (9), the heat exchanger (2) and the three-stage gas-liquid balance tank (10) are eliminated, and the gas phase at the outlet of the first-level gas-liquid balance tank (6) directly enters the second air pressure machine ( 7). The gas pressure at the outlet of the air compressor is 0.7MPa and 1.5MPa, respectively...

Embodiment 3

[0028] On the basis of embodiment 2, the three-stage air pressure machine (9), the heat exchanger (2) and the three-stage gas-liquid balance tank (10) are eliminated, and the gas phase at the outlet of the first-level gas-liquid balance tank (6) directly enters the second air pressure machine ( 7). The gas pressure at the outlet of the air compressor is 0.7MPa and 1.5MPa, respectively, the outlet temperature of the heat stream of the low-temperature heat extractor is 80°C, and the low-pressure desorption operating pressure of the common low-pressure desorption tank is 0.3MPa. Example 3: The new technology of low-temperature heat recovery and energy saving in the four-stage compression system of the top oil-gas air compressor of the fractionation tower of the catalytic cracking unit, such as Figure 4 The structure and connection method shown.

[0029] The temperature of the oil vapor at the outlet of the heat exchanger of each compression system is 70℃~96℃; the operating pressure ...

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Abstract

The invention relates to an oil-gas energy-saving device for a catalytic cracking fractionating tower and operation technology. The tower top of the fractionating tower is provided with a plurality of stages of compression systems. Each stage of compression system comprises a gas compressor, a heat exchanger and a gas-liquid separating tank; oil-gas current of each stage of compression system is compressed by the gas compressor to raise the temperature, then enters the heat exchanger for cooling and recovering low-temperature heat, and then enters the gas-liquid separating tank to finish the gas-liquid separation operation; and the downstream of each stage of compression system is provided with a public low-pressure desorption tank, outlet liquid of the gas-liquid separating tank of each stage of compression system enters the public low-pressure desorption tank for low-pressure desorption operation, and an outlet gas phase flows into an inlet of the first-stage gas compressor. The device has the advantages that the device can produce a large amount of byproduct low-pressure steam which can be taken as a low-temperature heat source of a catalytic cracker and other devices under the condition that a gas compressor system consumes partial power excessively, fully recover a large amount of latent heat of condensation and sensible heat of cooling of oil and gas at the tower top ofa main fractioning tower, greatly reduce the consumption of public engineering such as cooling water at the same time, and has remarkable energy-saving effect.

Description

Technical field [0001] The invention relates to a petroleum refining process, in particular to a catalytic cracking fractionating tower oil and gas energy-saving device and an operating process. Background technique [0002] The catalytic cracking unit is one of the main oil refining units. It is an important device for lightening heavy oil and producing liquefied petroleum gas, gasoline and diesel. The main task of the fractionation system of the catalytic cracking unit is to divide the oil and gas mixture sent from the reactor into rich gas, crude gasoline, light diesel oil, heavy diesel oil, refining oil and oil slurry according to the boiling point range, and to ensure that the quality of each fraction meets the requirements Requirements. In addition, it is necessary to use reflux heat and distillate waste heat to preheat the feedstock oil or other low-temperature media to a higher temperature, and use a steam generator to recover heat. The energy consumption and product qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G5/06
Inventor 李鑫钢李国涛隋红姜斌罗铭芳
Owner TIANJIN UNIV
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