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Method and device for online removing refinery plant FCC device waste heat boiler scale

A waste heat boiler and refinery technology, which is applied in separation methods, chemical instruments and methods, lighting and heating equipment, etc., can solve the problem that ammonium hydrogen sulfate is not suitable for positive pressure waste heat boilers in refineries.

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In conclusion, the ammonium bisulfate removal method suitable for negative pressure coal-fired boilers is not suitable for positive pressure waste heat boilers in refineries, and it is necessary to find an online ammonium bisulfate removal process suitable for FCC waste heat boilers

Method used

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  • Method and device for online removing refinery plant FCC device waste heat boiler scale

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Experimental program
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Effect test

Embodiment 1

[0040] Parameters of a CO waste heat boiler in a refinery: regeneration flue gas flow rate 160,000 Nm 3 / h, temperature 510°C, CO content 6% (v / v). Its design thermal efficiency is 77%, the temperature of the regenerated flue gas after combustion in the furnace is 813°C, the excess air coefficient is 1.2, the CO content is 3% (v / v), and the dust concentration is 0.7g / Nm 3 , and contain Cu, Fe, Ni, V, etc. that cause scaling of ammonium bisulfate in the waste heat boiler.

[0041] The waste heat boiler is added with a denitrification unit for denitrification. The denitrification reaction temperature is 308°C. After ammonia injection, the NOx is reduced from 800mg / Nm 3 down to 200mg / Nm 3 After 5 months of operation, due to the excessive addition of ammonia, the pressure drop of the advanced economizer of the boiler has increased from 600Pa to 1800Pa, and the exhaust gas temperature has increased from 175°C to 195°C. The reason for the analysis is that the economizer generates ...

Embodiment 2

[0044] Parameters of a CO waste heat boiler in a refinery: regeneration flue gas flow rate 140,000 Nm 3 / h, temperature 546°C, CO content 6.3% (v / v). Its design thermal efficiency is 75%, the temperature of the regenerated flue gas after combustion in the furnace is 800°C, the excess air coefficient is 1.3, the CO content is 3.2% (v / v), and the dust concentration is 0.6g / Nm 3 , and contain Cu, Fe, Ni, V, etc. that cause scaling of ammonium bisulfate in the waste heat boiler.

[0045] The waste heat boiler is added with a denitrification unit for denitrification. The denitrification reaction temperature is 313°C. After ammonia injection, the NOx is reduced from 600mg / Nm 3 down to 150mg / Nm 3 After 5 months of operation, due to the excessive addition of ammonia, the pressure drop of the advanced economizer of the boiler has increased from 800Pa to 1400Pa, and the exhaust gas temperature has increased from 169°C to 199°C. The reason for the analysis is that the economizer genera...

Embodiment 3

[0048] Parameters of a CO waste heat boiler in a refinery: regeneration flue gas flow rate 100,000 Nm 3 / h, temperature 532°C, CO content 6.2% (v / v). Its design thermal efficiency is 75%, the temperature of the regenerated flue gas after burning in the furnace is 808°C, the excess air coefficient is 1.4, the CO content is 3.4% (v / v), and the dust concentration is 0.8g / Nm 3 , and contain Cu, Fe, Ni, V, etc. that cause scaling of ammonium bisulfate in the waste heat boiler.

[0049] The waste heat boiler is added with a denitrification unit for denitrification. The denitrification reaction temperature is 309°C. After ammonia injection, the NOx is reduced from 700mg / Nm 3 down to 100mg / Nm 3 After 5 months of operation, due to the excessive addition of ammonia, the pressure drop of the advanced economizer of the boiler has increased from 650Pa to 1700Pa, and the exhaust gas temperature has increased from 166°C to 210°C. The reason for the analysis is that the economizer generates...

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Abstract

The invention relates to a method for online removing refinery plant FCC device waste heat boiler ammonium bisulfate scale. In terms of the flue gas flowing direction, a combustion chamber, a high-temperature superheating section, a low-temperature superheating section, a high-temperature evaporation section, an SCR denitration section, a low-temperature evaporation section, a high-temperature economizer and a low-temperature economizer are arranged in a waste heat boiler in sequence. Two ways of high-temperature flue gas are led out from the rear portion of the combustion chamber of the waste heat boiler, wherein the first way of the high-temperature flue gas is mixed with flue gas after the high-temperature evaporation section to enable the mixed flue gas to reach the temperature of 350-400 DEG C, generating of ammonium bisulfate is reduced, and then the mixed flue gas enters the SCR denitration section to be subjected to denitration treatment; and the other way of the high-temperature flue gas is mixed with flue gas after the low-temperature evaporation section to enable the mixed flue gas to reach the temperature of 400-470 DEG C, and then the mixed flue gas enters the high-temperature economizer to enable the ammonium bisulfate condensed on a furnace pipe of the economizer to be gasified and decomposed, so that the purpose of removing the scale is achieved. The economizer of the FCC device waste heat boiler is effectively prevented from being blocked by the ammonium bisulfate, the increased pressure drop, caused by ammonium bisulfate blocking of the economizer, of the waste heat boiler is lowered, the purpose of efficient ash removing is achieved, and additionally normal operation of the boiler is not affected.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification of waste heat boilers of FCC devices in refineries, and in particular to a method and device for online removal of ammonium bisulfate fouling in П-shaped waste heat boilers of FCC devices of refineries. Background technique [0002] NOx x , is one of the main pollution sources of air pollution, mainly forms nitric acid type acid rain, and is one of the main products of photochemical smog. In refineries, regeneration flue gas from catalytic cracking (FCC) units is the main NO x Emission source, annual emission in tons. Due to increasingly stringent environmental protection standards, FCC waste heat boilers are equipped with denitrification units. The denitrification units mainly adopt the SCR denitrification process, which is a flue gas denitrification technology that has developed rapidly in recent years. SCR (Selective Catalytic Reduction) is a selective catalytic reduction te...

Claims

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Application Information

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IPC IPC(8): F23J15/02F23J15/08B01D53/86B01D53/56
CPCB01D53/8628B01D2255/20707B01D2255/20723B01D2255/20769B01D2255/20776F23J15/02F23J15/08
Inventor 李勇王学海姜阳
Owner CHINA PETROLEUM & CHEM CORP
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