Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH)

A technology of neutral cleaning agent and cleaning agent, which is applied in the direction of detergent composition, soap detergent composition, surface active non-soap compound and cleaning composition, etc., and can solve the problems of increased water consumption of absorption towers, corrosion of downstream facilities, human body , equipment and environmental impact, etc., to achieve the effect of improving cleaning efficiency and effect, strengthening the ability to break through the scale layer, and thoroughly removing hard scale

Active Publication Date: 2011-11-16
ZHEJIANG ZHENENG TECHN RES INST +1
View PDF6 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the GGH heat exchange surface is fouled, its heat exchange efficiency decreases, the temperature of the raw flue gas entering the desulfurization tower exceeds the design value, the water consumption of the absorption tower increases, the temperature of the net flue gas does not meet the requirements, and it is easy to cause corrosion to downstream facilities. Affect the lift height of flue gas and the diffusion of pollutants
[0004] The traditional chemical cleaning technology is pickling or alkaline cleaning, mainly using hydrofluoric acid and strong alkali, which have a great impact on human body, equipment and environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH)
  • Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH)
  • Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Neutral cleaning agent: ethylenediaminetetraacetic acid 30%, alkylphenol polyoxyethylene ether phosphate 1.2%, alkylphenol polyoxyethylene ether 0.4%, acrylic acid-phosphonate binary copolymer 7%, hydroxide Potassium is 15%, and the balance is water; potassium hydroxide is added in the form of 50% potassium hydroxide aqueous solution.

[0049] EDTA 1500kg, alkylphenol polyoxyethylene ether phosphate ester salt 60kg, alkylphenol polyoxyethylene ether 20kg, acrylic acid-phosphonate binary copolymer 350kg, 50% potassium hydroxide aqueous solution 1500L (hydroxide Potassium 750kg), water 1570kg were stirred and mixed at 45°C, and the pH value was adjusted to 8.4 to prepare 5 tons of cleaning agent. join in Figure 10 In the cleaning liquid tank shown, clean the desulfurization system GGH of the 660MW unit of A#3 unit of the power plant (German Buckdur company, the rotor diameter is 15.2m, and the rotor height is 1.06m), start the circulating cleaning pump, and check the in...

Embodiment 2

[0054] Neutral cleaning agent: ethylenediaminetetraacetic acid 40%, alkylphenol polyoxyethylene ether phosphate salt 1.2%, alkylphenol polyoxyethylene ether 0.4%, acrylic acid-acrylate-phosphonic acid-sulfonate quaternary copolymer 7%, potassium hydroxide 20%; the balance is water, and potassium hydroxide is added in the form of 50% potassium hydroxide aqueous solution.

[0055] 4000kg of ethylenediaminetetraacetic acid, 120kg of alkylphenol polyoxyethylene ether phosphate ester salt, 40kg of alkylphenol polyoxyethylene ether, 700g of acrylic acid-acrylic acid ester-phosphonic acid-sulfonate tetrapolymer, 50% hydroxide Potassium aqueous solution 4000L (potassium hydroxide 2000kg) and water 1140kg were mixed at room temperature (20°C) to prepare 10 tons of cleaning agent with a pH value of 8.2.

[0056] Cleaning the desulfurization system GGH of the 600MW unit B#2 unit of the power plant (Buckdurr, Germany, the rotor diameter is 15.2m, the rotor height is 1.01m). The thermal e...

Embodiment 3

[0061] EDTA 45%, Alkylphenol Ethoxylate Phosphate 1.2%, Alkylphenol Ethoxylate 0.4%, Acrylic-Acrylic Ester-Phosphonic Acid-Sulfonate Tetrapolymer 7%, Hydrogen Potassium oxide is 22.5%, the balance is water, and potassium hydroxide is added in the form of 50% potassium hydroxide aqueous solution.

[0062] EDTA 6750kg, alkylphenol polyoxyethylene ether phosphate 180kg, alkylphenol polyoxyethylene ether 60kg, acrylic acid-acrylate-phosphonic acid-sulfonate tetrapolymer 1050kg, 50% potassium hydroxide Mix 6750L of aqueous solution (3375kg of potassium hydroxide) and 210kg of water at room temperature (20°C) to prepare 15 tons of cleaning agent with a pH value of 8.3. The desulfurization system GGH of the 600MW unit of C#2 unit of the cleaning power plant, due to the large ash content and high sulfur content of the coal fired by the unit, exceeded the design coal type and the checked coal type, creating huge pressure on the operation of the unit including the desulfurization system...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Average corrosion rateaaaaaaaaaa
Average corrosion rateaaaaaaaaaa
Corrosion rateaaaaaaaaaa
Login to View More

Abstract

The invention discloses a neutral detergent which consists of the following raw materials by weight percent: 30-50% of main detergent, 0.5-2.5% of surfactant, 0.2-2.5% of penetrant, 2-8% of cosolvent, 15-25% of base and the balance of water, wherein the pH value of the detergent is 7-9; and the main detergent is a polycarboxylic acid compound and / or organic carboxylic acid compound. Compared with the prior art, the neutral detergent has the beneficial effects of thoroughly clearing hard scale, having no corrosion on metal, enamel, glass and the like and having no toxicity on a human body, and a waste liquid can be completely discharged and recycled, thus the detergent disclosed by the invention is an environmentally-friendly neutral detergent which is efficient and safe; and by using the neutral detergent, stubborn scale on the surface of a heat exchange element of GGH of a desulfurization system can be rapidly and effectively cleaned with the cleaning period of 5-7 days, and the cleaning effect can reach an assessment criteria for a power plant performance test, thereby contributing to energy conversation and emission reduction.

Description

(1) Technical field [0001] The invention relates to a chemical cleaning agent and its application, in particular to a GGH hard scale cleaning agent for a limestone-gypsum wet desulfurization system and its application. (2) Background technology [0002] The flue gas heat exchanger (GGH) is one of the main devices in the flue gas desulfurization system. Its function is to use the original flue gas to heat the desulfurized clean flue gas, so that the exhaust gas temperature reaches above the acid dew point, reduce the corrosion of the clean flue gas flue and chimney, and increase the diffusion of pollutants; The flue gas temperature of the absorption tower reduces the technological requirements for anti-corrosion in the tower. The limestone-gypsum wet flue gas desulfurization system of domestic thermal power plants built in the early stage basically used flue gas-flue gas reheater (GGH). [0003] GGH flue gas heat exchanger is an important device for wet desulfurization in t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C11D10/02
Inventor 张国鑫刘昕刘春红朱云水陆军魏青
Owner ZHEJIANG ZHENENG TECHN RES INST
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com