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Online scale removal method for smoke gas turbine of catalytic cracking unit

A technology for catalytic cracking devices and hoods, applied to cleaning methods and appliances, chemical instruments and methods, and cleaning methods using gas flow, etc., can solve the problems of low cleaning efficiency, improve cleaning efficiency, reduce vibration, The effect of reducing losses

Inactive Publication Date: 2020-03-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of low scale removal efficiency in the prior art. It provides a new online scale removal method for catalytic cracking unit hoods, which has the advantage of high scale removal efficiency

Method used

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  • Online scale removal method for smoke gas turbine of catalytic cracking unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of method for online scale cleaning of flue gas machine of catalytic cracking unit, such as figure 1 As shown, the online descaling technology for hoods invented adopts the method of "segmented cooling and intermittent flushing". Sweep (200-120°C). In order to prevent damage to the impeller, the maximum speed of the hood in the hot state is controlled within 1000rpm during the descaling process. At other times, the hood always starts automatic cranking, and the cranking speed is 73rpm. The specific process is as follows:

[0033] 1. Unit switching

[0034] The main fan-hood fan unit is switched to the standby machine, the main fan-hood fan system is shut down, and the electric barring is started. The gate valve and butterfly valve at the inlet of the hood are closed, the water seal tank is filled with water, the vent valve at the outlet of the hood is fully opened, the sealing air and sealing steam are put into use normally, the lubricating oil pump is operati...

Embodiment 2

[0053] According to the conditions and steps described in Example 1, the method of the present invention is applied to the online descaling of a hood of an FCC device. The design parameters of a smoke machine are the inlet temperature of 670°C, the inlet pressure of 0.24MPa(g), and the flow rate of 3050m 3 / min. The vibration value of the hood shell has increased. The maximum vibration of the machine body reaches 6.5mm / s, and continues to fluctuate. After cleaning the scale online according to the above method, after the unit is restarted, the vibration speed of the hood shell reaches 1.6mm / s, the shaft vibration is 25.5um, and the hood operates normally.

Embodiment 3

[0055] According to the conditions and steps described in Example 1, the method of the present invention is applied to the online descaling of a certain FCC device B hood. The design parameters of a certain hood are intake temperature 670°C, intake pressure 0.25MPa(g), Flow 2500m 3 / min. The vibration of the rotor shaft rose to above 90μm, and the vibration speed of the bearing box shell rose to above 12mm / s. After analysis, it was caused by the fouling of the hood. The hood was cleaned online according to the above-mentioned technical method. After the flue gas is put into operation, the vibration of the front pad shaft is 25 μm, the rear pad shaft is 29 μm, the vibration speed of the bearing box on site is 0.9 mm / s, and the range hood operates normally.

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Abstract

The invention relates to an online scale removal method for a smoke gas turbine of a catalytic cracking unit, which mainly solves the problem of low scale removal efficiency in the prior art. By adopting the online scale removal method for the smoke gas turbine of the catalytic cracking unit, the difference between expansion coefficients of a catalyst scale layer and a smoke gas turbine rotor is utilized, sediments are layered, fall off and are blown off by changing the temperature of a smoke gas turbine wheel disc, the dynamic balance of the smoke gas turbine rotor is improved on line, the problems are welled solved through a technical scheme realizing the purpose of reducing vibration, and the method can be used for online scale removal of the smoke gas turbine of the catalytic crackingunit.

Description

technical field [0001] The invention relates to an online scale cleaning method for a smoke machine of a catalytic cracking unit. Background technique [0002] The flue gas turbine (referred to as the smoke machine) is the main energy-saving equipment of the fluid catalytic cracking (FCC) unit, which is the core equipment of the oil refinery, and is also the key rotating equipment of the unit. For a long time, the hoods of FCC installations in my country have generally faced the dilemma of long-term operation, and the number of unplanned shutdowns and the length of shutdowns remain high. The working environment of the hood is extremely harsh, and the regenerated flue gas inevitably contains a lot of fine catalyst powder (particles ≤ 10um ≥ 98%, particles ≤ 5um close to 90%), which is caused by the scaling of the fine catalyst powder on the hood rotor Decreased unit efficiency or increased vibration values ​​have become the main reasons for unplanned shutdown of smoke machin...

Claims

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Application Information

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IPC IPC(8): B08B7/00B08B5/02B08B13/00
CPCB08B5/02B08B7/0071B08B13/00
Inventor 陈文武兰正贵谢守明邱志刚屈定荣
Owner CHINA PETROLEUM & CHEM CORP
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