Softener for station boiler sediment incrustation and two-stage incrustation-removing method

A power plant boiler and softener technology, which is applied in descaling and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as long cleaning time and affecting power generation production, and achieve real and effective results. Considerable economic value and the effect of reducing production costs

Inactive Publication Date: 2008-10-01
杨兴富
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long cleaning time of this cleaning method, the shutdown of the furnace will affect the power generation production, so the cleaning of difficult scale in power stations is still a major problem, and there is no more effective solution.

Method used

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  • Softener for station boiler sediment incrustation and two-stage incrustation-removing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A large-scale joint venture in Guangzhou, two B&WB35 / 3.8-M power generation boilers, one was put into operation in 1995 and the other was put into operation in 1997. It has never been cleaned since it was put into operation, and gray-black scale with a thickness of 1 to 3 mm is formed on the heating surface. , the scale is mixed with black organic matter, which is very hard and adheres tightly. The results of scale analysis are shown in Table 1.

[0030] Table 1 Analysis and detection results of scale samples

[0031]

[0032] From the analysis results of the scale samples, it can be seen that the scale formed by the two power plant boilers contains SiO 2 It is more than 36%, converted into silicate, its amount is more than 50%, which is a typical silicate difficult scale, and most of the scale has formed hornblende crystals, which are very hard and difficult to remove.

[0033] Then can effectively remove with technical method of the present invention, its way is: ...

Embodiment 2

[0044] A HG212-75 / 3.8 power generation boiler in a power plant of an iron and steel company in Kunming has not been cleaned since it was put into production. Difficult scale with a thickness of 1.5 to 3 mm has formed on the heating surface. After cleaning with the present invention, the effect is very good. The inspection and acceptance by the boiler inspection department shows that the quality is superior to the standard requirements of the "Boiler Chemical Cleaning Rules", and is well received by users (see user report, acceptance report).

[0045] The specific method is:

[0046]The first step is to add the following descaling and softening agent in the mass ratio to pH=12±0.3 during the operation of the boiler, and maintain the pH value so that the boiler water can run for 5 to 7 days under normal blowdown conditions, and then stop the boiler, and the original scale has disappeared. Transformation, partly eluted:

[0047] Sodium ethylenediamine tetramethylene phosphonate ...

Embodiment 3

[0056] Feed according to the following formula:

[0057] Sodium ethylenediamine tetramethylene phosphonate 5kg

[0058] Sodium polyacrylate 3kg

[0059] Na 3 PO 4 12H 2 O 40kg

[0060] NaOH 15kg

[0061] Na 2 CO 3 29kg

[0062] Sodium humate 5kg

[0063] Disodium edetate 3kg

[0064] After the above raw materials are fully mixed, the descaling and softening agent product is obtained.

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PUM

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Abstract

The invention provides a softener of the scale that is difficult to be removed from a boiler used in a power station and a two-step washing scale removing method. The softener consists of the raw materials as follows based on the mass ratio: 0.5 to 7 percent of sodium ethylenediamine tetramethylene phosphonate, 0.6 to 8 percent of sodium polyacrylate, 10 to 40 percent of Na3PO4 question mark 12H2O, 8 to 35 percent of NaOH, 15 to 65 percent of Na2CO3, 2 to 10 percent of sodium humate and 0.5 to 5 percent of disodium ethylenediamine tetraacetate. The two-step scale removing method comprises the steps as follows: the softener for removing the scale is added during the operation of the boiler till the pH value is 10 to 12, the pH value of the water in the boiler is kept for 5 to 7 days under normal waste discharging situation to lead the scale of the boiler to fall off after being softened and dissolved; a corrosion inhibiting hydrochloride cleaning agent bought from market is used for cleaning at normal temperature according to a technique of Chemical Cleaning Rules of Boilers, thereby greatly shortening operation time with good cleaning effect. The scale cleaning time can be shortened to 2 to 3 days from the original 8 to 10 days. The softener for removing the scale has the advantages of innocuity, no harm and no corrosion, and can completely soften and dissolve the scale that is difficult to be removed. The problem that difficult scale of boilers of medium and low voltage power stations can not be cleaned in the prior art. The softener is also applicable to industrial boilers.

Description

technical field [0001] The invention relates to a softening agent for difficult scales, in particular to a preparation for removing difficult scales of power plant boilers and a cleaning and descaling method thereof. Background technique [0002] Power station boilers refer to boilers whose main purpose is power generation and combined heat and power generation. This type of boiler has a large evaporation capacity (t / h), high pressure, and high cost. After the boiler has been in operation for a period of time, it may form difficult scales. For this reason, descaling must be carried out. Otherwise, if the boiler scales seriously, it will directly Causing the boiler tube burst, a safety accident occurred. In addition, boiler fouling will also cause problems such as increased energy consumption and high production costs, because every 1mm of scale formed will waste 4% of fuel. For example: a power boiler with an evaporation capacity of 75t / h, if the scale is 1mm thick, it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 杨兴富
Owner 杨兴富
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