How to adjust the ph value of boiler water

A boiler furnace and boiler water technology, applied in the chemical industry, can solve the problems of poor control of alkali addition, failure to achieve a gentle upward trend of the dotted line, alkaline corrosion of the boiler drum and the boiler body, etc., and avoid pH fluctuations. Large, fast and effective operation, good corrosion inhibition effect

Active Publication Date: 2016-03-23
CHINA SHENHUA ENERGY CO LTD +2
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AI Technical Summary

Problems solved by technology

[0003] At present, the main adjustment method for the low pH of the boiler water is to add an alkaline solution, such as NaOH solution, to the boiler water, but adding an alkaline solution will make it difficult to control the amount of alkali added, because the OH contained in the alkaline solution of the boiler water - Ionizes well in solution, and H in furnace water + The combination is very fast, and the pH curve of the boiler water changes greatly. Therefore, simply adding an alkaline solution will make it difficult to control the pH of the boiler water. It does not achieve the purpose and effect of adjusting the gentle upward trend of the dotted line, and it is very easy to cause alkaline corrosion of the boiler drum and the boiler body

Method used

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  • How to adjust the ph value of boiler water

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The 2# boiler water in the thermal power center was polluted by organic matter, and the online pH meter dropped from the normal 9.5 to 4.73. A dosing system with three first dosing metering boxes and two second dosing metering boxes was adopted, such as figure 1 shown.

[0039] Adding concentration is the sodium hydroxide solution of 3.5wt% in 3 first dosing metering boxes respectively, and adding concentration is respectively the acetaldehyde oxime solution of 4wt% in the second dosing metering box, by dosing pump in boiler steam Sodium hydroxide solution is added to the inlet of the dosing point of the package, and acetaldehyde oxime aqueous solution is added to the inlet of the boiler feed water dosing point. The water online pH meter controls the pH value of the boiler water to achieve a gentle rising trend of the curve. Wherein the volume of the alkaline solution added by the first dosing metering box accounts for 2% of the total volume of the boiler water, and th...

Embodiment 2

[0043] The 2# boiler water in the thermal power center was polluted by organic matter, and the online pH meter dropped from the normal 9.5 to 6.2. A dosing system with three first dosing metering boxes and two second dosing metering boxes was adopted, such as figure 1 shown.

[0044] Adding concentration is the sodium hydroxide solution of 2.5wt% in 3 first dosing metering boxes respectively, and adding concentration is the acetaldehyde oxime solution of 3wt% respectively in the second dosing metering box, by dosing pump in boiler steam Sodium hydroxide solution is added to the inlet of the dosing point of the package, and acetaldehyde oxime aqueous solution is added to the inlet of the boiler feed water dosing point. The water online pH meter controls the pH value of the boiler water to achieve a gentle rising trend of the curve. Wherein the volume of the alkaline solution added by the first dosing metering box accounts for 1% of the total volume of the boiler water, and the...

Embodiment 3

[0048] The operation is the same as in Example 1, the difference is as follows: respectively adding a concentration of 2wt% sodium hydroxide solution to the first 3 dosing metering boxes, and adding a concentration of 2.5wt% to the second dosing metering box respectively The methyl ethyl ketone oxime solution, wherein the volume of the alkaline solution added by the first dosing metering box accounts for 2% of the total volume of boiler water, and the volume of the acetaldehyde oxime solution added by the second dosing metering box accounts for 2.5% of the total volume of boiler furnace water.

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Abstract

The invention discloses a method of adjusting pH value of boiler water of a boiler. The method comprises the following steps: when the pH value of boiler water of the boiler is lower than a predetermined pH value, adding an alkaline solution and an oxime compound into the boiler water of the boiler; when the alkaline solution is adopted to adjust the pH value of boiler water of the boiler, solving the problem that the pH value of boiler water of the boiler is low by adding the oxime compound into boiler water of the boiler and meanwhile, avoiding the problem that the pH value of boiler water of the boiler is great in fluctuation in the adjusting process, wherein the adjusting curve slowly ascends; and adding the oxime compound as an effective chemical deoxygenator to chemically deoxygenate in a boiler drum and the boiler main body, consume free oxygen molecules in the boiler main body and prevent the surface of metal of the boiler from being corroded by oxygen, wherein the oxime compound has reducibility, protects the boiler main body and has a good corrosions effect. The adjusting method is simple in operation and quick and effective. Acetaldoxime is directly added at the inlet of the equipment without adding large instruments and equipment.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for adjusting the pH value of boiler water. Background technique [0002] During the operation of boilers, waste heat boilers, waste heat boilers and other equipment in the power and chemical industries, the problem of low pH of the boiler water due to water quality fluctuations often occurs, and even the lowest pH of the boiler water reaches 2-4, resulting in corrosion of the boiler equipment body. In the process of water quality fluctuation, how to quickly and effectively adjust the boiler water in a short period of time, so that in the adjustment process, it can ensure that the pH value quickly returns to the normal value without causing secondary corrosion to the equipment body. It is the goal pursued by people in the electric power and chemical industries. [0003] At present, the main adjustment method for the low pH of the boiler water is to add an a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66
Inventor 苏旭东王为岩
Owner CHINA SHENHUA ENERGY CO LTD
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