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Decoking agent for power plant boiler, preparation method and application thereof

A decoking agent and boiler technology, applied in fuel additives, petroleum industry, solid fuel, etc., can solve problems such as decoking agent not suitable for large boilers in power plants, ash accumulation or coking, coal quality instability, etc., and achieve significant social benefits and economic benefits, reduce coal consumption, and have a wide range of applications

Active Publication Date: 2013-06-12
SHANGHAI EMPEROR OF CLEANING HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defect that the traditional decoking agent is not suitable for large-scale boilers in power plants. For the problem of ash accumulation or coking caused by unstable coal quality, it can solve the problem of high ash content, high sulfur content and high water content in coal quality. and low calorific value, provide a decoking agent and its preparation method, and its application in power plant boilers

Method used

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  • Decoking agent for power plant boiler, preparation method and application thereof
  • Decoking agent for power plant boiler, preparation method and application thereof
  • Decoking agent for power plant boiler, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Prepare 1500kg of decoking agent for medium-pressure boilers in small power plants

[0038] Formula: potassium nitrate 75kg, ammonium nitrate 60kg, ammonium molybdate 30kg, copper nitrate hydrate (chemical formula is Cu(NO 3 ) 2 ·3H 2 O, the same below) 75kg, borax 30kg, hydrated magnesium nitrate (chemical formula is Mg(NO3) 2 ·6H 2 (2, the same below) 150kg, and the balance is deionized water.

[0039] 2. Add 120kg of decoking agent every week, and add it into the furnace in 3 times (using 4-8kg / cm 2 After using the decoking agent for 3 months, observe the slag on the slag removal machine, and it becomes looser and lighter in color than before without adding the decoking agent. The exhaust gas temperature dropped from 165°C to 154°C before and after adding the decoking agent for 3 months.

Embodiment 2

[0041] 1. Prepare 2400kg of decoking agent for medium-pressure and high-pressure boilers in medium-sized power plants

[0042] Formula: 168kg of potassium nitrate, 96kg of ammonium nitrate, 48kg of ammonium molybdate, 144kg of hydrated copper nitrate, 144kg of borax, 288kg of hydrated magnesium nitrate, and the balance is deionized water.

[0043] 2. Add 180kg of decoking agent every week, and add it into the furnace in 3 times (using 4-8kg / cm 2 After using the decoking agent for 3 months, observe the slag on the slag removal machine, and it becomes looser and lighter in color than before without adding the decoking agent. The exhaust gas temperature dropped from 158°C to 148°C before and after adding the decoking agent for 3 months.

Embodiment 3

[0045] 1. Prepare 3000kg decoking agent for ultra-high pressure boiler in 200MW power plant

[0046] Formula: 240kg of potassium nitrate, 180kg of ammonium nitrate, 90kg of ammonium molybdate, 210kg of hydrated copper nitrate, 180kg of borax, 390kg of hydrated magnesium nitrate, and the balance is deionized water.

[0047]2. Add 250kg of decoking agent every week, and add it into the furnace in 3 times (using 4-8kg / cm 2 After using the decoking agent for 3 months, observe the slag on the slag removal machine, and it becomes looser and lighter in color than before without adding the decoking agent. The specific comparative data before and after adding the decoking agent for 3 months are shown in Table 1-3.

[0048] Table 1 Changes of carbon content in fly ash and carbon content in slag

[0049]

Mean value before dosing

mean value after dosing

difference

Slag carbon content%

1.25

1.06

0.19

Carbon content of fly ash %

1...

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Abstract

The invention discloses a decoking agent which comprises the following components by mass percent: 5-10 % of potassium nitrate, 4-8 % of ammonium nitrate, 2-4 % of ammonium molybdate, 5-11 % of hydrated copper nitrate, 2-8 % of borax, 10-17 % of hydrated magnesium nitrate and the balance being deionized water. The invention further discloses a preparation method of the decoking agent and an application of the decoking agent in a power plant boiler. The decoking agent provided by the invention is non-toxic, high-efficient and convenient in use, and can not only effectively inhibit coking of the boiler and strongly clear already formed coke on a heating surface of the boiler, but also reduce carbon content of fly ash and slag, thereby greatly promoting development of energy saving of the power plant, improving thermal efficiency and service life of the boiler and prolonging operation period of the boiler.

Description

technical field [0001] The invention relates to the field of decoking agents, in particular to a decoking agent used in power plant boilers and a preparation method and application thereof. Background technique [0002] The quality of coal actually burned by power plant boilers is quite different from the design coal quality, and the ash content in the coal quality is much higher than the design value, which may easily cause problems such as ash accumulation and coking on the heating surface during combustion; sulfur, Impurities such as vanadium and nickel, metal oxides, sulfates, vanadates and other compounds generated during the combustion process will not only cause corrosion problems to equipment to varying degrees, but also cause serious damage to equipment passing through the flue gas. slagging and sediment. After the boiler has been running for a period of time, after the boiler has accumulated ash or coke, the evaporation capacity of the boiler will decrease and the...

Claims

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Application Information

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IPC IPC(8): C10L9/10C10L10/00C10L10/04C10L10/18
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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