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Method for regulating and controlling sinter quality and dioxin generation by using garbage-derived carbon

A technology of deriving carbon and sintered ore, applied in the direction of improving process efficiency, etc., can solve the problems of reducing the production of coke powder, decreasing the mechanical strength of sintering ore, and rapidly decreasing the mechanical strength of sintering ore

Active Publication Date: 2021-02-12
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The carbon content of garbage-derived carbon is 60-80%, the low calorific value is 18.32-30.36MJ / kg, but the ash content is as high as 19-38% (the CaO content in the ash is as high as 40%), and the patent application number is 201810027221.6 invention patent Attempts have been made to assist iron ore sintering based on domestic waste-derived carbon, and use waste-derived carbon to replace part of coke powder to assist iron ore sintering. Experiments have found that when the proportion of waste-derived carbon instead of coke powder does not exceed 30%, the sintering of waste-derived carbon-assisted iron ore has a positive effect on sintering. The mechanical strength of the ore (falling index and drum index) is less affected, but when the ratio of waste-derived carbon instead of coke powder exceeds 30%, the mechanical strength of sintered ore decreases rapidly
Therefore, the ratio of waste-derived carbon to replace coke powder is limited, and it is difficult to further reduce the waste of resources and environmental pollution caused by the production of coke powder. At the same time, in the experiment, our research group found that excessive waste-derived carbon assisted iron ore sintering, resulting in rapid mechanical strength of sinter In addition to the decline, it will also reduce the combustion efficiency of solid fuels, resulting in an increase in the concentration of combustible gases and organic pollutants (dioxins and volatile organic compounds (VOCs), etc.) in the flue gas

Method used

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  • Method for regulating and controlling sinter quality and dioxin generation by using garbage-derived carbon
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  • Method for regulating and controlling sinter quality and dioxin generation by using garbage-derived carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Configure 50Kg of raw materials: the mass percentages of mixed ore, return ore, solvent, and fuel are 58.27%, 24%, 13%, and 4.73% in sequence. The solvent includes quicklime, dolomite, and limestone, and the mass percentages are 3%, 4%, and 6% in sequence. The fuel is coke powder, and a sintering cup experiment is carried out. During the sintering cup experiment, a S Type thermocouple, make the thermocouple penetrate into the sintering cup about 110mm, monitor the temperature of the material layer in the sintering process by connecting the thermocouple to the temperature display, and obtain the curve of the temperature of the sintering cup with the sintering time, and calculate according to the curve: initial softening and melting temperature , the maximum sintering temperature, and the vertical sintering speed, and the concentration of dioxins in the sintering flue gas was monitored by a Shimadzu QP2010 gas chromatography-mass spectrometer.

Embodiment 2～ Embodiment 12

[0077] Configure 50Kg of raw materials: the mass percentages of mixed ore, returned ore, quicklime, dolomite, limestone, coke powder, and garbage-derived carbon are configured according to Table 6, and then the sintering cup experiment is carried out, and the initial softening and melting temperature and the maximum sintering temperature are measured at the same time. , vertical sintering speed, and the concentration of dioxins in the flue gas.

[0078] Table 6

[0079]

[0080] Table 6 shows the optimization of fuel and solvent structure and the optimized ore blending schemes of various garbage-derived carbons under the condition of ensuring the sintering mixture taste unchanged in Examples 1 to 12. Table 7 shows the influence of different sintering raw material structures on the melting temperature and the temperature of the sintering material layer in Examples 1 to 12. Table 8 shows the effects of different waste-derived carbon optimized ore mixes on sinter quality and ...

Embodiment 13～ Embodiment 14

[0087] Configure 5 groups of 50Kg raw materials of embodiment 13 in the mode of embodiment 1, configure 5 groups of 50Kg raw materials of embodiment 14 in the mode of embodiment 4, in each group of raw materials: mixed ore, return ore, unslaked lime, dolomite, limestone , coke powder, and waste-derived carbon are configured in turn according to Table 9, and the sintering cup experiment is carried out, and the figure 1 The sintering flue gas extracted from the bottom of each group of sintering cups is mixed with the combustion-supporting air 5 and introduced into each group of sintering cups. In the 5 groups of experiments in Example 13 and Example 14, the mixing amount of sintering flue gas is the introduced combustion-supporting air and 0%, or 20%, or 30%, or 40%, or 50% of the total volume of liquefied gas, and simultaneously measure the initial softening and melting temperature, the maximum sintering temperature, the vertical sintering speed, and the drum of the sample after...

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Abstract

The invention discloses a method for regulating and controlling sinter quality and dioxin generation by garbage-derived carbon by assisting iron ore sintering, which can improve the proportion of thegarbage-derived carbon in sintered solid fuel to 30-50% by optimizing the structure and proportion of solid fuel and solvent in sintering ingredients; for the change of the alkali metal content causedby the increase of the garbage-derived carbon in the sintering ingredients, the garbage-derived carbon assists in optimizing ore blending to construct a low-temperature mineralization raw material structure so as to adapt to the characteristic of low temperature of a sintering material layer, and under the premise of ensuring the balance of the alkali metal content in the sintering ingredients, the low-temperature mineralization raw material structure is quickly molten and mineralized at a lower temperature; enough liquid phase intermediates are generated; and meanwhile, the sinter structureand the quality are regulated and controlled by assistance of thermal-state flue gas circulation, so that the emission of dioxin organic pollutants during sintering is reduced.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of municipal solid waste treatment and coal chemical technology, and more specifically relates to a method for regulating the quality of sintered ore and the generation of dioxins by assisting iron ore sintering with waste-derived carbon. Background technique [0002] Iron ore sintering is to mix iron ore powder, solid fuel (coke powder / anthracite) and flux (the main component is CaO) in a certain proportion, arrange them on the sintering machine, and generate high temperature by means of solid fuel combustion to generate a certain amount of liquid intermediate. The body wets and bonds the iron ore particles to form a porous massive sinter with a certain strength. [0003] The carbon content of garbage-derived carbon is 60-80%, the low calorific value is 18.32-30.36MJ / kg, but the ash content is as high as 19-38% (the CaO content in the ash is as high as 40%), and the patent application numb...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/16Y02P10/20
Inventor 秦林波秦万里韩军赵波陈旺生张强
Owner WUHAN UNIV OF SCI & TECH