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Cleaning method of scale in boiler

An oxide scale and boiler technology, which is applied to boiler cleaning devices, boiler cleaning control devices, components of steam boilers, etc., can solve the problems of high processing difficulty and poor effectiveness, and achieves reduction of processing difficulty, improvement of effectiveness, and avoidance of repetition. falling off" effect

Active Publication Date: 2020-07-28
CHNA ENERGY INVESTMENT CORP LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The main purpose of the present invention is to provide a method for cleaning the scale in the boiler, so as to solve the problems of poor effectiveness and high processing difficulty in cleaning the scale of the boiler in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] For scale cleaning of supercritical units, the rated power is 660MW. The specific process is as follows:

[0037] During the operation of the unit, use the OLCA with a plunger pump (flow rate: 0.5 ~ 1.5m 3 / h, head: 2.5~3.0MPa) can be injected into the downpipe of the deaerator, OLCA is a mixture of hexamethylenetetramine and octadecylamine, and the mass ratio between the two is 1:9.

[0038] Within 4 days before the planned shutdown, increase the dosage of OLCA to 300kg / d;

[0039] Within 2 days before the planned shutdown, increase the dosage of OLCA to 600kg / d;

[0040] Within 24 hours before the planned shutdown, increase the dosage of OLCA to 1000kg / d;

[0041] The formed cleaning process and system are as follows:

[0042] Deaerator downpipe→feedwater front pump→feedwater pump→high pressure heater→coal economizer→steam drum→low temperature section superheater→high temperature section superheater→steam turbine high pressure cylinder→low temperature section rehe...

Embodiment 2

[0047] For scale cleaning of supercritical units, the rated power is 660MW. The specific process is as follows:

[0048] During the operation of the unit, use the OLCA with a plunger pump (flow rate: 0.5 ~ 1.5m 3 / h, head: 2.5~3.0MPa) can be injected into the downpipe of the deaerator, OLCA is a mixture of hexamethylenetetramine and octadecylamine, and the mass ratio between the two is 1:9.

[0049] Within 4 days before the planned shutdown, increase the dosage of OLCA to 250kg / d;

[0050] Within 2 days before the planned shutdown, increase the dosage of OLCA to 500kg / d;

[0051] Within 24 hours before the planned shutdown, increase the dosage of OLCA to 800kg / d;

[0052] The formed cleaning process and system are as follows:

[0053] Deaerator downpipe→feedwater front pump→feedwater pump→high pressure heater→coal economizer→steam drum→low temperature section superheater→high temperature section superheater→steam turbine high pressure cylinder→low temperature section rehea...

Embodiment 3

[0058] For scale cleaning of supercritical units, the rated power is 660MW. The specific process is as follows:

[0059] During the operation of the unit, use the OLCA with a plunger pump (flow rate: 0.5 ~ 1.5m 3 / h, head: 2.5~3.0MPa) can be injected into the downpipe of the deaerator, OLCA is a mixture of hexamethylenetetramine and octadecylamine, and the mass ratio between the two is 2:8.

[0060] Within 3 days before the planned shutdown, increase the dosage of OLCA to 300kg / d;

[0061] Within 1 day before the planned shutdown, increase the dosage of OLCA to 600kg / d;

[0062] Within 20 hours before the planned shutdown, increase the dosage of OLCA to 1000kg / d;

[0063] The formed cleaning process and system are as follows:

[0064] Deaerator downpipe→feedwater front pump→feedwater pump→high pressure heater→coal economizer→steam drum→low temperature section superheater→high temperature section superheater→steam turbine high pressure cylinder→low temperature section rehea...

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PUM

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Abstract

The invention provides a washing method for oxide scale in a boiler. The method includes the following steps that a washing drug agent is added into the boiler in the operating process of the boiler,the adding amount of the washing drug agent is the first drug adding amount, the first drug adding amount is adjusted as the second drug adding amount before 3-4 days of boiler stopping, and the second drug adding amount is adjusted as the third drug adding amount before 1-2 days of boiler stopping; and the third drug adding amount is adjusted as the fourth drug adding amount within 24 hours before boiler stopping, wherein, the fourth drug adding amount is greater than the third drug adding amount, the third drug adding amount is greater than the second drug adding amount, the second drug adding amount is greater than the first drug adding amount, the washing drug agent comprises multi-amine and aliphatic amine, the multi-amine comprises hexamethylenetetramine and / or diethylene triamine, and the aliphatic amine comprises at least one of oda, hexadecylamine, tetradecyl amine and lauryl amine. By means of the washing method, the effectiveness of removing of the oxide scale of the boilercan be obviously improved, and meanwhile, the processing difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of boiler cleaning, in particular to a method for cleaning super (super) critical boiler scale. Background technique [0002] The high-temperature steam pipes of super (super) critical boilers are mainly austenitic stainless steel, and their main components are iron (Fe), chromium (Cr), nickel (Ni) and other elements. The oxide skin is formed by the oxidation of metal pipes in high-temperature steam. The formed corrosion products are mainly composed of iron oxide, nickel oxide and chromium oxide. These oxides have a dense structure and are evenly attached to the surface of the metal pipe in the form of a film, which is called a high-temperature oxide film, and its thickness is generally between 0.04 and 0.5 μm. With the extension of the operating time of the unit, the oxidation continues, resulting in the continuous growth and thickening of the oxide film, forming a high-temperature oxide scale (hereinafter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B37/52F22B37/56
CPCF22B37/52F22B37/565
Inventor 曹忠友邹庆江张啸张欣吴天明李岩张振达
Owner CHNA ENERGY INVESTMENT CORP LTD