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Decoking agent

A decoking agent and material technology, applied in the chemical field, can solve the problems of acidic corrosion of metal pipe walls, increased production costs, and high costs

Inactive Publication Date: 2013-01-30
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium chloride in the dust and coke removal agent will cause acid corrosion of the metal pipe wall under high temperature conditions; moreover, the use of rare earth oxides as raw materials is costly, and the use of large-scale power plant boilers will increase production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The components and percentages by weight of the decoking agent in this embodiment are: borax 10, aluminum powder 2, zinc powder 4, magnesium powder 4, copper nitrate 10, potassium nitrate 12, potassium permanganate 18, manganese dioxide 10, oxide Magnesium 10, Calcium Oxide 5, Aluminum Oxide 10, Silica 5.

[0024] After the above raw materials are mixed evenly according to the proportion, they are fully ground, and the product can be obtained when the particle size reaches 280 mesh.

[0025] This product has been tried on a 300MW subcritical power plant boiler for two months. The coking condition is good, the large coking is basically removed, the small coking is basically maintained below 20cm, and the exhaust gas temperature rises by 4-20°C.

Embodiment 2

[0027] The components and percentages by weight of the decoking agent in this embodiment are: borax 11, aluminum powder 6, zinc powder 6, copper nitrate 9, potassium nitrate 10, potassium permanganate 10, manganese dioxide 20, magnesium oxide 8, oxide Calcium 10, Aluminum Oxide 2, Silica 8.

[0028] After the above raw materials are mixed evenly according to the proportion, they are fully ground, and the product can be obtained when the particle size reaches 280 mesh.

[0029] The product has been tried on a 300MW subcritical power plant boiler for two months. The coking condition is good, the large coking is basically removed, the small coking is basically maintained below 18cm, and the exhaust gas temperature rises by 6°C.

Embodiment 3

[0031] The components and percentages by weight of the decoking agent in this embodiment are: borax 12, aluminum powder 5, magnesium powder 8, copper nitrate 24, potassium nitrate 10, potassium permanganate 14, magnesium oxide 9, aluminum oxide 9, dioxide Silicon 9.

[0032] After the above raw materials are mixed evenly according to the proportion, they are fully ground, and the product can be obtained when the particle size reaches 280 mesh.

[0033] This product has been tried on a 300MW subcritical power plant boiler for two months. The coking condition is good, the large coking is basically removed, the small coking is basically maintained below 20cm, and the exhaust gas temperature rises by 9°C.

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PUM

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Abstract

The invention relates to a decoking agent capable of reducing or removing coked blocks and deposited dust in coal-fired boilers and industrial boilers. The components and weight percentage of each component of the decoking agent are as follows: 10-20 of borax, 10-25 of active metal powder, 10-25 of a combustion-supporting material and 10-30 of a high-melting point material. The basic material-borax can lower bonding strength of slag, is easy to produce volatile gas, and makes coked slag loosen; the combustion-supporting material can generate a lot of oxygen atoms under a high temperature, and directly promotes the combustion of coal powder. Besides, metal ions such as manganese ions and copper ions in reaction products can catalyze the combustion of oxydic coal powder and increases combustion efficiency, thereby reducing coke and the deposited dust; the active metal powder can form a dense high-melting point material oxide film under high temperature, protects the heating surface from washing of corrosion and smoke, and prolongs service life.

Description

[0001] technical field [0002] The invention relates to the field of chemical technology, in particular to a decoking agent for reducing and removing coke blocks and ash deposits in coal-fired boilers and industrial boilers. Background technique [0003] During the coal-fired combustion process of the coal-fired boiler, the heating surface of the water-cooled wall pipe is coked, and the pipes of the passer and reheater accumulate dust, the heat exchange efficiency of the boiler decreases, the exhaust gas temperature rises, and the energy consumption increases. The heating surface of the pipeline is prone to sulfate corrosion due to severe coking, shortening the service life of the boiler, etc. These problems will seriously affect the boiler safety and economical operation. [0004] At present, for the ash removal and coking of industrial boilers and large-scale power plant boilers, two methods are usually used to manually remove ash and coke after stopping the furnace or ...

Claims

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Application Information

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IPC IPC(8): C10L9/10C10L10/00C10L10/04C10L10/18
Inventor 李启云彭飞
Owner SNTO TECH GRP
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