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Composition for controlling contamination of boiler or other components and application thereof

A composition and boiler technology, applied in the direction of combustion product treatment, non-flammable liquid/gas transportation, combustion method, etc., can solve the problem of not reaching the rated load, restricting the use of Zhundong coal, and strong pollution of the heat exchange surface, etc. problems, to ensure safe and reliable operation, and to solve serious coking and pollution problems

Inactive Publication Date: 2017-08-15
XINTE ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the deposits on the heat exchange surface can be regularly blown off with a soot blower to a certain extent, when the bond strength between the deposit and the heat exchange surface reaches a certain level, it is difficult to remove it with a soot blower
[0007] The largest integrated Zhundong coalfield in my country has a high content of alkaline earth metals, which is extremely polluting to the heat exchange surfaces in boiler internals such as furnaces and flues, which leads to the safe and reliable operation of large power plant boilers that use such thermal coal. The rated load is not reached, and the number of shutdowns increases, which seriously affects the company's profits and greatly restricts the use of Zhundong Coal in the field of coal power

Method used

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  • Composition for controlling contamination of boiler or other components and application thereof
  • Composition for controlling contamination of boiler or other components and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of the composition

[0033] Siliceous materials and oxides of alkaline earth metals (wherein the silicate materials are magnesium silicate, sodium metasilicate, microsilica, white carbon black, etc.; alkaline earth metal oxides are magnesium oxide, barium oxide or calcium oxide) with a certain The ratio (silicon material: alkaline earth metal oxide = 0.25 ~ 1:3) is put into a mixer (twin-shaft screw mixer) and mixed evenly, and then the resulting mixture is put into a grinder (Raymond mill) to grind to fineness It can be 150-600 mesh. Subsequently, 100 to 1500 ppm of rare earth oxide (cerium nitrate or cerium oxide) is added to the above mill based on the total weight of the composition, thereby obtaining a composition.

[0034] Calculated based on the amount of ash received, continuously spray 0.1% by weight composition into the convective heat exchange area upstream of the flue gas of a 350MW supercritical boiler, and then measure the furnace outlet tempe...

Embodiment 2

[0036] The composition in Example 1 is continuously sprayed into the convective heat exchange area upstream of the flue gas of the 350MW supercritical boiler, the difference is: based on the calculation of the amount of ash received, the content of the injected composition is 1.0 wt. %. Then measure the furnace outlet temperature, final superheater temperature, final reheater temperature, boiler evaporation and furnace soot blowing times. Wherein the above results are the results of adding the composition for one week. The test results are summarized in Table 1.

Embodiment 3

[0038] The composition in Example 1 is continuously sprayed into the convective heat exchange area upstream of the flue gas of the 350MW supercritical boiler, the difference is: based on the calculation of the amount of ash received, the content of the injected composition is 1.2 wt. %. Then measure the furnace outlet temperature, final superheater temperature, final reheater temperature, boiler evaporation and furnace soot blowing times. Wherein the above results are the results of adding the composition for one week. The test results are summarized in Table 1.

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PUM

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Abstract

The present invention provides a composition for controlling pollution of boilers or parts thereof, comprising: siliceous material and oxides of alkaline earth metals. The invention also provides a method of controlling contamination of a boiler or its components. The composition of the invention can effectively increase the devitrification of the deposited adhesion layer of boiler fuel products, reduce the slagging tendency of combustion products on the surface of boiler internal parts and make the deposit layer deposited on the surface of boiler internal parts more brittle.

Description

technical field [0001] The present invention relates to a composition, in particular to a composition for controlling pollution of a boiler or its parts and its use. Background technique [0002] Boilers (such as pulverized coal furnaces) burn solid fuels and their analogues, especially from the high temperature decomposition and compounding products of minerals in coal-fired solid fuels. exchange effect. [0003] Combustion products are firmly bonded to the surface of the boiler or its components (such as water-cooled wall pipes in the furnace, high-temperature reheater, high-temperature superheater, economizer and air preheater, etc.), and these deposition products accumulate to a certain extent to prevent the boiler from Flue gas flow. [0004] U.S. Patent No. 4,817,722 discloses a method of using treatment chemicals to treat oil and gas wells having flow lines fed into the well casing annulus, including flushing the casing annulus with the well's production fluid; for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L7/00F23J1/00F23J3/00
CPCF23L7/00F23J1/00F23J3/00
Inventor 郭增昌李西良张大德胡瑜高隽
Owner XINTE ENERGY
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