A cleaning method for efficient descaling of oil field boiler convection section

A convection section and boiler technology, which is applied in combustion methods, removal of solid residues, treatment of combustion products, etc., can solve problems such as poor heat exchange effect, complex and hard components, incomplete combustion, etc. Reduces chemical damage and improves removal efficiency

Active Publication Date: 2018-05-08
田新松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Oil field steam injection boilers burn oil for a long time, and there are many situations such as incomplete combustion and operation below the dew point during operation. Over time, serious ash accumulation problems are caused in the convection section (heating surface), and the ash accumulation on the fins is hard and difficult to deal with.
Fouling causes flue blockage and poor heat transfer effect, seriously affecting operating economy and safety
[0003] At present, methods such as dry ice blasting, sandblasting, compressed air, and manual cleaning are used to clean the convection section of oilfield boilers, but the effect is poor; of course, high-pressure water guns are also used to directly clean the convection section. The composition of the high-pressure jet is complex and hard, and it is difficult to remove. The high pressure of the direct high-pressure jet will cause damage to the equipment. At the same time, the high-pressure jet device requires a manual hand-held spray gun. The recoil force caused by the high-pressure water flow is large, and it is not easy to operate.

Method used

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  • A cleaning method for efficient descaling of oil field boiler convection section
  • A cleaning method for efficient descaling of oil field boiler convection section
  • A cleaning method for efficient descaling of oil field boiler convection section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A cleaning method for efficient descaling of the convection section of an oilfield boiler, comprising the following steps:

[0034] A. Spray penetrant: Spray penetrant on the fouling in the convection section, after standing still, micropores will appear in the fouling;

[0035] B. Spray corrosion inhibitor: spray corrosion inhibitor on the scale;

[0036] C. High-pressure flushing: Use high-pressure water flow carrying neutralizing detergent to flush the accumulated scale, and the descaling process is completed after flushing.

[0037] The pressure of the high-pressure water flow is less than 50MPa, and the flow rate is less than 1.5m 3 / h. The penetration agent is sodium polyphosphate solution, and the concentration of the penetration agent is 2%; the corrosion inhibitor is urotropine solution, and the concentration of the corrosion inhibitor is 20%; the neutralization cleaning agent It is a sodium hydroxide solution, and the concentration of the neutralizing clean...

Embodiment 2

[0039] A cleaning method for efficient descaling of the convection section of an oilfield boiler, comprising the following steps:

[0040] A. Remove floating ash: remove floating ash inside the convection section;

[0041] B. Spray penetrant: Spray penetrant on the fouling in the convection section, after standing still, micropores will appear in the fouling;

[0042] C. Spray corrosion inhibitor: spray corrosion inhibitor on the scale;

[0043] D. High-pressure flushing: Use high-pressure water flow carrying neutralizing detergent to flush the accumulated scale, and the descaling process is completed after flushing.

[0044] The pressure of the high-pressure water flow is less than 50MPa, and the flow rate is less than 1.5m 3 / h. The penetration agent is sodium alkylnaphthalene sulfonate solution, and the concentration of the penetration agent is 5%; the corrosion inhibitor is a thiourea solution, and the concentration of the corrosion inhibitor is 10%; the neutralization ...

Embodiment 3

[0046] A cleaning method for efficient descaling of the convection section of an oilfield boiler, comprising the following steps:

[0047] A. Remove floating ash: remove floating ash inside the convection section;

[0048] B. Spray penetrant: Spray penetrant on the fouling in the convection section, after standing still, micropores will appear in the fouling;

[0049] C. Spray corrosion inhibitor: spray corrosion inhibitor on the scale;

[0050] D. High-pressure flushing: use high-pressure water flow with neutralizing cleaning agent to flush the fouling;

[0051] E. Repeat inspection: check the convection section, if the scale is not cleared, repeat steps B, C and D until the scale is washed away;

[0052] F. Spray passivator: spray passivator on the heating surface of the convection section;

[0053] G. Water spray cleaning: Use clean water to clean the convection section; the descaling process is completed after the clean water is cleaned.

[0054] The penetration agent ...

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PUM

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Abstract

The invention relates to a cleaning method for efficient descaling of a convection section of an oil field boiler. The cleaning method comprises the following steps that a penetrating agent is sprayed, a corrosion inhibitor is sprayed, and high-pressure washing is conducted. According to the cleaning method, the chemical reagent is used for loosening scale firstly, then the scale is washed with water containing a neutralization cleaning agent, and the pressure and flow of high-voltage water flow are reduced, so that damage to the convection section in the cleaning process is greatly reduced, and the scale removing efficiency is effectively improved; and meanwhile, since the scale is acidic materials, the chemical reagent is added to neutralizing acid liquid formed during washing, and chemical damage to the convection section in the cleaning process is reduced.

Description

technical field [0001] The invention belongs to the field of oil field equipment cleaning, and in particular relates to a cleaning method for efficient descaling of a convection section of an oil field boiler. Background technique [0002] Oilfield steam injection boilers burn oil for a long time, and there are many situations such as incomplete combustion and operation below the dew point during operation. Over time, serious ash accumulation problems are caused in the convection section (heating surface), and the ash accumulation on the fins is hard and difficult to deal with. Fouling causes flue blockage and poor heat transfer effect, seriously affecting operating economy and safety. [0003] At present, methods such as dry ice blasting, sandblasting, compressed air, and manual cleaning are used to clean the convection section of oilfield boilers, but the effect is poor; of course, high-pressure water guns are also used to directly clean the convection section. The compos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J3/02
CPCF23J3/02
Inventor 田新松刘杰刘凡张挺田丰赫李华
Owner 田新松
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