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Method for cleaning 90 percent calcium sulfate dirt

A technology of calcium sulfate scale and cleaning method, which is applied in the field of chemical cleaning of boilers in thermal power plants, can solve problems such as inability to remove scale, and achieve the effects of shortening the planned construction period, saving consumption, and increasing profits

Active Publication Date: 2013-01-23
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a cleaning method for 90% calcium sulfate scale to solve the problem that the current descaling method cannot remove scale containing 90% calcium sulfate scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The first transformation and pickling: transformation parameter Na 2 CO 3 : 6.0%, NaOH: 1.0%, after the transformation fluid is prepared, the boiler starts to increase the pressure slowly, and the boiler pressure rises to 0.1MPa in the first 2 hours, and then increases to 1.0MPa according to the normal pressure increase speed of the boiler, and maintains 24 hours; hydrochloric acid pickling parameters HCl: 5%, corrosion inhibitor: imidazoline cationic compound 0.3%, slowly add to the boiler, hydrochloric acid soaking time is 3.5 hours, let the CO produced by the reaction 2 Adequate removal of gas;

[0016] The second transformation and pickling: the transformation is the same as the first time, the hydrochloric acid pickling parameter is 5%, corrosion inhibitor: imidazoline cationic compound 0.3%, soaking time is 3 hours;

[0017] The third transformation and pickling: transformation parameter Na 2 CO 3 : 5.0%, NaOH: 0.8%, after the transformation fluid is prepared,...

Embodiment 2

[0020] The first transformation and pickling: transformation parameter Na 2 CO 3 : 6.2%, NaOH: 1.1%, after the transformation fluid is prepared, the boiler starts to increase the pressure slowly, and the boiler pressure rises to 0.1MPa in the first 2.5 hours, and then increases to 1.1MPa according to the normal pressure increase speed of the boiler, and maintains 24 hours; hydrochloric acid pickling parameters HCl: 6%, corrosion inhibitor: imidazoline cationic compound 0.4%, slowly add to the boiler, hydrochloric acid soaking time is 4.5 hours, let the CO produced by the reaction 2 Adequate removal of gas;

[0021] The second transformation and pickling: the transformation is the same as the first time, the hydrochloric acid pickling parameter is 5.3%, corrosion inhibitor: imidazoline cationic compound 0.4%, soaking time is 4 hours;

[0022] The third transformation and pickling: transformation parameter Na 2 CO 3 : 5.3%, NaOH: 0.9%, after the transformation fluid is prepa...

Embodiment 3

[0025] The first transformation and pickling: transformation parameter Na 2 CO 3 : 6.4%, NaOH: 1.2%, after the transformation fluid is prepared, the boiler starts to increase the pressure slowly, and the boiler pressure rises to 0.1MPa in the first 3 hours, and then increases to 1.2MPa according to the normal pressure increase speed of the boiler, and maintains 24 hours; hydrochloric acid pickling parameters HCl: 7%, corrosion inhibitor: imidazoline cationic compound 0.5%, slowly add to the boiler, hydrochloric acid soaking time is 5.5 hours, let the CO produced by the reaction 2 Adequate removal of gas;

[0026] The second transformation and pickling: the transformation is the same as the first time, the hydrochloric acid pickling parameter is 5.6%, corrosion inhibitor: imidazoline cationic compound 0.5%, soaking time is 5 hours;

[0027] The third transformation and pickling: transformation parameter Na 2 CO 3 : 5.6%, NaOH: 1.0%, after the transformation fluid is prepare...

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Abstract

The invention relates to a method for cleaning 90 percent calcium sulfate dirt, and belongs to the field of chemical cleaning of boilers in thermal power plants. The method comprises four-time transformation and acid pickling. The invention has the advantages that: the method breaks through a mode of one-time transformation and acid pickling in the traditional process, and multiple transformationand acid pickling mode, namely a layer-by-layer stripping mode is adopted; the consumption of a transformation agent and acid is reduced, and the expected effect is achieved; and through four-time transformation and acid pickling, the dirt on a water cooling wall is removed completely, the planned construction period is shortened, more benefit is brought to owners, and the method is approved by boiler room professionals in a local special equipment inspection center and private station staff of iron ore enterprises.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of boilers in thermal power plants. Background technique [0002] According to the DL / T794-2001 "Guidelines for Chemical Cleaning of Boilers in Thermal Power Plants": For drum boilers that have been put into operation, if the scale contains high sulfate and silicate content, in order to improve the descaling effect, it can be cleaned after pickling. Before carrying out the transformation of alkali boiling according to the following steps: [0003] 1) Add the mixture of sodium carbonate and trisodium phosphate dissolved into a solution into the boiler, and make the concentration of the agent in the boiler water evenly reach Na 2 CO 3 0.3%~0.6%, Na 3 PO 4 12H 2 O 0.5% to 1.0%. [0004] 2) The pressure of the boiler is raised slowly. Generally, the pressure of the boiler is raised to 0.05MPa within 5 hours, and the transition time of the soda boiling is 36h to 48h in total. If the scali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
Inventor 衡世权王久生孙天利张建新李润涛张春波
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD