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Boiler cleaning process

A boiler cleaning and boiler technology, applied to boiler cleaning devices, etc., can solve the problems of easy acid corrosion, hidden dangers of boiler safe operation, inconvenient on-site application, etc., achieve considerable economic and environmental benefits, reduce the consumption of chemical agents, improve The effect of utilization efficiency

Inactive Publication Date: 2013-04-10
CHANGSHA BLUECLEAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic Shaanxi Chemical Design Institute uses pyrazolone drug by-product FAA colloid to make SH-405 citric acid pickling corrosion inhibitor, the performance is not stable enough, and the shelf life is short
Hydrochloric acid has a strong ability to dissolve iron oxides, but the corrosion inhibitors used for hydrochloric acid pickling require different corrosion inhibitors under different circumstances, which brings inconvenience to field application
[0005] The chemical cleaning and passivation process recommended by the widely used power industry standard "Guidelines for Chemical Cleaning of Boilers in Thermal Power Plants" (DL / T794-2001) generally has high passivation temperature, high energy consumption, long time, and even some passivation agents It is a carcinogen itself, and the environmental protection problem is prominent; especially the phosphate residue caused by the passivation of phosphate and polyphosphate is easy to cause acid corrosion, which will undoubtedly bring hidden dangers to the safe operation of the boiler in the future

Method used

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  • Boiler cleaning process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for boiler cleaning, comprising the following steps:

[0034] ① Establish a cleaning pump station

[0035] Set up a cleaning circulation pump (1) and a cleaning liquid treatment tank (2) between the sewage outlet (12) and the water inlet (14) of the boiler system (6); connect the water injection pump (3) and the water supply tank (4), Isolation and cleaning have nothing to do with the system, including the valves connected to the boiler system and pipelines within the cleaning range must be closed tightly, the devices and cyclone separators in the steam drum that are not suitable for cleaning must be removed, and the water level gauge and all instruments must be removed;

[0036] ②Hot pressure test

[0037] Fill the steam drum of the boiler system (6) with water through the water injection pump (3) and the water supply tank (4), close the water injection pump (3) and the exhaust port (17) of the boiler system, and start the cycle of the cleaning circulation pu...

Embodiment 2

[0047] A method for boiler cleaning, comprising the following steps:

[0048] ① Establish a cleaning pump station

[0049] Set up a cleaning circulation pump (1) and a cleaning liquid treatment tank (2) between the sewage outlet (12) and the water inlet (14) of the boiler system (6); connect the water injection pump (3) and the water supply tank (4), Isolation and cleaning have nothing to do with the system, including the valves connected to the boiler system and pipelines within the cleaning range must be closed tightly, the devices and cyclone separators in the steam drum that are not suitable for cleaning must be removed, and the water level gauge and all instruments must be removed;

[0050] ②Hot pressure test

[0051] Fill the steam drum of the boiler system (6) with water through the water injection pump (3) and the water supply tank (4), close the water injection pump (3) and the exhaust port (17) of the boiler system, and start the cycle of the cleaning circulation pu...

Embodiment 3

[0061] A method for boiler cleaning, comprising the following steps:

[0062] ① Establish a cleaning pump station

[0063] Set up a cleaning circulation pump (1) and a cleaning liquid treatment tank (2) between the sewage outlet (12) and the water inlet (14) of the boiler system (6); connect the water injection pump (3) and the water supply tank (4), Isolation and cleaning have nothing to do with the system, including the valves connected to the boiler system and pipelines within the cleaning range must be closed tightly, the devices and cyclone separators in the steam drum that are not suitable for cleaning must be removed, and the water level gauge and all instruments must be removed;

[0064] ②Hot pressure test

[0065] Fill the steam drum of the boiler system (6) with water through the water injection pump (3) and the water supply tank (4), close the water injection pump (3) and the exhaust port (17) of the boiler system, and start the cycle of the cleaning circulation pu...

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Abstract

The invention relates to a boiler cleaning process, which belongs to the technical field of chemical cleaning for equipment and includes the following steps of building a cleaning pump station, testing under pressure, cleaning water scale, raising boilers and systems thereof, passiviating and flushing by water. The boiler cleaning process is simple, energy-saving and environment-friendly, is freeof acidic corrosion to the boilers, and requires low cleaning temperature and short cleaning time.

Description

technical field [0001] The invention relates to chemical cleaning of equipment, in particular to a method for cleaning a boiler. Background technique [0002] In daily industrial production, boiler water is continuously circulated and concentrated during use, and the mineral content in the water will continue to increase, which will cause scaling and oxygen corrosion on the furnace wall and fire tube. Once scale is formed on the fire tube of the furnace wall, the heat exchange efficiency will be greatly reduced, and the boiler will accelerate oxygen corrosion. 3+ , Fe 2+ state, while Fe 3+ , Fe 2+ , Fe, OH - The electrochemical corrosion between ions is more serious. If things go on like this, the service life of the boiler will be shortened and the safe production will be endangered. Therefore, the furnace wall fire tube of the boiler must be treated regularly. Common types of scale include carbonate scale, sulfate scale, silicate scale, mixed scale, iron oxide scale,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B37/52
Inventor 刘金山
Owner CHANGSHA BLUECLEAN TECH
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