Method for forecasting ash fusion point variation trend after coal and sludge combined firing

A technology of changing trends and mixed combustion, which is applied in the direction of chemical analysis, instruments, and calculations by means of combustion. It can solve problems that affect the combustion effect of boiler life, difficult to predict ash melting characteristics, and boiler slagging, so as to achieve less quality and shorter prediction period. Short, less work-intensive effect

Inactive Publication Date: 2015-04-29
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The ash content in sludge is high and its composition is complex. After co-combustion with coal, its ash fusion characteristics are difficult to predict. However, the deposition characteristics of ash in the process of co-combustion between sludge and coal with different characteristics are quite d

Method used

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  • Method for forecasting ash fusion point variation trend after coal and sludge combined firing
  • Method for forecasting ash fusion point variation trend after coal and sludge combined firing
  • Method for forecasting ash fusion point variation trend after coal and sludge combined firing

Examples

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Effect test

Embodiment 1

[0024] Coal A and sludge sample B were dried, shrunk, ground, and sieved, and kept in an oven at 105-110°C for 2-2.5 hours to obtain a dry base sample. Chemical method, in a muffle furnace controlled by a program, burn the sample at a temperature of (815±10)°C until the quality is constant to obtain ash samples, and analyze the ash components of the ash samples, and the ash component analysis uses AXIOSadvanced wavelength dispersive X-rays Fluorescence spectrometer, the results of each mineral component of the ash component analysis are shown in the following table:

[0025] Table 1 Contents of mineral components

[0026]

[0027] From Table 1, in the mixed sample obtained from coal A and sludge B, the mineral composition Fe 2 o 3 、Al 2 o 3 and SiO 2 The contents accounted for 72.01%, 43.77% and 55.48% of the mixed samples respectively, it can be considered that Fe 2 o 3 -Al 2 o 3 -SiO 2 The component system is the main component; select Fe through the ternary pha...

Embodiment 2

[0030] Coal A and sludge sample C were dried, shrunk, ground, and sieved, and kept in an oven at 105-110°C for 2-2.5 hours to obtain a dry base sample. Chemical method, in a muffle furnace controlled by a program, burn the sample at a temperature of (815±10)°C until the quality is constant to obtain ash samples, and analyze the ash components of the ash samples, and the ash component analysis uses AXIOSadvanced wavelength dispersive X-rays Fluorescence spectrometer, the results of each mineral component of the ash component analysis are shown in the following table:

[0031] Table 2 Contents of mineral components

[0032]

[0033] From Table 2, in the mixed samples obtained from A and C, the mineral components CaO, Al 2 o 3 and SiO 2 The contents accounted for 42.98%, 37.21% and 68.75% of the mixed sample respectively, it can be considered that CaO-Al 2 o 3 -SiO 2 The component system is the main component; select CaO-Al through the ternary phase diagram tool book 2 ...

Embodiment 3

[0036] Coal A and sludge sample D were dried, shrunk, ground, and sieved, and kept in an oven at 105-110°C for 2-2.5 hours to obtain dry base samples. Chemical method, in a muffle furnace controlled by a program, burn the sample at a temperature of (815±10)°C until the quality is constant to obtain ash samples, and analyze the ash components of the ash samples, and the ash component analysis uses AXIOSadvanced wavelength dispersive X-rays Fluorescence spectrometer, the results of each mineral component of the ash component analysis are shown in the following table:

[0037] Table 3 Contents of mineral components

[0038]

[0039]From Table 3, in the mixed sample obtained from coal A and sludge D, the mineral composition Fe 2 o 3 、Al 2 o 3 and SiO 2 The content accounted for 11.57%, 55.07% and 97.42% of the mixed sample respectively, it can be considered that Fe 2 o 3 -Al 2 o 3 -SiO 2 The component system is the main component; select Fe through the ternary phase d...

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Abstract

The invention discloses a method for forecasting the ash fusion point variation trend after coal and sludge combined firing. The method comprises the following steps: (1) drying a coal and sludge mixed sample, splitting, grinding, screening the processed mixed sample with a sieve, and drying the mixed sample powder passing through the sieve; (2) preparing an ash sample by adopting a rapid ashing method; (3) performing ash composition analysis on the ash sample, and detecting the species and the contents of mineral constituents; (4) selecting three mineral constituents with the maximum content and selecting corresponding ternary phase diagrams; (5) labeling points on which coal and sludge are located on the ternary phase diagrams and connecting the points on which the coal and the sludge are located into a line; and (6) obtaining the ash fusion point variation trend along with the content of the sludge in the mixed sample. The method can be used for quickly and effectively forecasting the ash fusion point variation trend of the coal and sludge mixed sample along with the content of the sludge to bring convenience for efficiently determining the species of the coal and the sludge in the coal and sludge mixed sample and the ash fusion property variations probably caused after the coal is mixed with the sludge in the initial stage.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more specifically relates to a method for predicting the change trend of ash melting point after coal and sludge are mixed and burned. Background technique [0002] With the acceleration of China's urbanization process, the rate of urban sewage treatment has increased year by year, and the sludge output of urban sewage treatment plants has also increased sharply. After sludge without proper treatment enters the environment, it will cause secondary pollution to water bodies and the atmosphere. It not only reduces the effective treatment capacity of the sewage treatment system, but also poses a serious threat to the ecological environment and human activities. [0003] Currently, sludge disposal methods mainly include sea discharge, landfill, agricultural use, and incineration. Due to the advantages of reduction, harmlessness and resource utilization, the incineration method will cont...

Claims

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Application Information

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IPC IPC(8): G01N31/12G06F19/00
Inventor 张成邓昌亚苏杭朱天宇方庆艳谭鹏陈刚丘永琪
Owner HUAZHONG UNIV OF SCI & TECH
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