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Biomass energy and method for detecting degree of corrosion of biomass energy to superheater

A biomass energy and superheater technology, applied in the fields of biofuels, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve the problems affecting the safe and economic operation of boilers, boiler heating area ash, boiler high temperature corrosion, etc., to ensure safety The effect of economical and stable operation, reduction of ash accumulation, and improvement of combustion conditions

Inactive Publication Date: 2019-03-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in biomass combustion. Due to the high content of alkali metals (K, Na) in biomass, the melting point of alkali metal salts decreases during the combustion process, resulting in ash accumulation and edge formation on the heating surface of the boiler; In addition, the most serious thing is the high chlorine content in biomass, which together with alkali metal salts will cause high-temperature corrosion on the heating surface of the boiler, thus seriously affecting the safe and economical operation of the boiler

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix straw ash and Zhundong coal ash at a ratio of 1:0, use absolute ethanol to make a suspension and spread it evenly on the surface of the T91 metal sheet, raise the temperature of the reactor to 700°C to maintain a constant temperature, and inject simulated flue gas ( 6% O2, 12% CO2, 500ppm HCl, balance gas N2), after the gas flow is stable, put the ash-coated T91 into the reactor, use the weight gain method to measure the corrosion degree, weigh every 6h, and corrode The duration of the experiment is 48 hours. Set up parallel samples. Quantitatively analyze the change data of the corrosion gain of the metal sample with time, and define the curve equation ΔG=kτ in the form of a parabola 1 / 2 , ΔG is the corrosion weight gain at any time; k is the coefficient of the parabola, which characterizes the corrosion rate. The corrosion rate of pure wheat straw is K0=0.8674.

Embodiment 2

[0041] Mix straw ash and Zhundong coal ash at a ratio of 1:3, use absolute ethanol to make a suspension and spread it evenly on the surface of the T91 metal sheet, raise the temperature of the reactor to 700°C to maintain a constant temperature, and inject simulated flue gas ( 6% O2, 12% CO2, 500ppm HCl, balance gas N2), after the gas flow is stable, put the ash-coated T91 into the reactor, use the weight gain method to measure the corrosion degree, weigh every 6h, and corrode The duration of the experiment is 48 hours. Quantitatively analyze the change data of the corrosion gain of the metal sample with time, and define the curve equation ΔG=kτ in the form of a parabola 1 / 2 , ΔG is the corrosion weight gain at any time; k is the coefficient of the parabola, which characterizes the corrosion rate. Compared with pure wheat straw, the corrosion rate decreased from K0=0.8674 to K1=0.3569, which was 41.15% of the original corrosion rate.

Embodiment 3

[0043] Mix straw ash and Zhundong coal ash at a ratio of 1:1, use absolute ethanol to make a suspension and spread it evenly on the surface of the T91 metal sheet, raise the temperature of the reactor to 700°C to maintain a constant temperature, and inject simulated flue gas ( 6% O2, 12% CO2, 500ppm HCl, balance gas N2), after the gas flow is stable, put the ash-coated T91 into the reactor, use the weight gain method to measure the corrosion degree, weigh every 6h, and corrode The duration of the experiment is 48 hours. Set up parallel samples. Quantitatively analyze the change data of the corrosion gain of the metal sample with time, and define the curve equation ΔG=kτ in the form of a parabola 1 / 2 , ΔG is the corrosion weight gain at any time; k is the coefficient of the parabola, which characterizes the corrosion rate. Compared with pure wheat straw, the corrosion rate decreased from K0=0.8674 to K2=0.5025, which was 57.93% of the original corrosion rate.

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Abstract

The invention provides biomass energy and a method for detecting the degree of corrosion of the biomass energy to a superheater. A biomass material and a coal material are mixed and combusted, on theone hand, purposes of diluting alkali metal and reducing the content of chlorine element are achieved, the problems of dust accumulation, slag formation and corrosion are relieved, on the other hand,the condition of combustion is improved by interaction between biomass and a coal, the combustion efficiency is improved, and safe, economical and stable running of a boiler is ensured. The biomass and the coal are taken as the raw materials for blending combustion, reduction of the degree of corrosion of the superheater is explored by different mixing ratios, furthermore, the invention provides adetecting method to detect the degree of corrosion of the biomass energy to the superheater, and therefore, safe, economical and stable running of the boiler is ensured.

Description

technical field [0001] The invention relates to the technical field of bioenergy, and in particular designs a biomass energy and a method for detecting the corrosion degree of the biomass energy to a superheater. Background technique [0002] As a clean and renewable energy source, biomass energy has broad prospects for development. One way to utilize biomass is direct combustion. Now many countries have developed and produced large-scale fluidized bed boilers that use biomass as fuel. This combustion method has high efficiency and can realize large-scale and efficient utilization of biomass. However, there are also some problems in biomass combustion. Due to the high content of alkali metals (K, Na) in biomass, the melting point of alkali metal salts decreases during the combustion process, resulting in ash accumulation and edge formation on the heating surface of the boiler; In addition, the most serious thing is the high chlorine content in biomass, which together with a...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N5/00C10L5/44C10L5/04
CPCC10L5/04C10L5/44G01N5/00G01N17/006Y02E50/10Y02E50/30
Inventor 金晶张瑞璞赵冰刘敦禹熊志波王秋麟朱以周李伟刘中毅杭伊煊周健健冯亮宁星李振壮
Owner UNIV OF SHANGHAI FOR SCI & TECH
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