System and method for utilizing flue gas pyrolysis to perform pre-desulfurization and demercuration before combustion of high sulfur coal

A high-sulfur coal, pre-desulfurization technology, applied in the preparation/purification of sulfur, fuel, solid fuel, etc., can solve the problems of neglecting sulfur, fixed removal of mercury, etc., and achieve the effect of reducing treatment cost and high desulfurization efficiency

Active Publication Date: 2018-06-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods only remove sulfur and mercury in the gas, but ignore the fixed removal of sulfur and mercury in the pyrolysis process

Method used

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  • System and method for utilizing flue gas pyrolysis to perform pre-desulfurization and demercuration before combustion of high sulfur coal
  • System and method for utilizing flue gas pyrolysis to perform pre-desulfurization and demercuration before combustion of high sulfur coal
  • System and method for utilizing flue gas pyrolysis to perform pre-desulfurization and demercuration before combustion of high sulfur coal

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Experimental program
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Effect test

Embodiment 1

[0056] A high-sulfur coal is used as raw material, and its industrial analysis element analysis is shown in Table 1. The particle size of pulverized coal is about 0.1-0.3mm, and the flue gas is transported into the pyrolyzer from the pulverized coal inlet 4; the high-temperature sulfur-fixing agent with a particle size of 0.5-1.0mm is blown into the heat from another flue gas through the sulfur-fixing agent inlet 5 Decomposer, the flow is 1 / 10-1 / 5 of the pulverized coal flow. The flue gas enters the fluidized bed pyrolyzer through the air distribution plate 3 of the hood, and the bed temperature is controlled at 700-900°C. The pulverized coal undergoes a pyrolysis reaction, and the generated gas entrains powdered coke to contact with the sulfur-fixing agent, and about 60% of the gas mixture flows out from the airflow pipe of the inverted concave spoiler 7 . The gas mixture enters the cyclone separator 10, and the gas tar collecting device 11 after gas-solid separation. The p...

Embodiment 2

[0058] A medium-sulfur coal is used as raw material, and its industrial analysis element analysis is shown in Table 1. The particle size of pulverized coal is about 0.1-0.3mm, and the flue gas is transported into the pyrolyzer from the pulverized coal inlet 4; the high-temperature sulfur-fixing agent with a particle size of 0.5-1.0mm is blown into the heat from another flue gas through the sulfur-fixing agent inlet 5 Decomposer, the flow is 1 / 10-1 / 5 of the pulverized coal flow. The flue gas enters the fluidized bed pyrolyzer through the air distribution plate 3 of the hood, and the bed temperature is controlled at 700-900°C. The pulverized coal undergoes a pyrolysis reaction, and the generated gas entrains powdered coke to contact with the sulfur-fixing agent, and about 60% of the gas mixture flows out from the airflow pipe of the inverted concave spoiler 7 . The gas mixture enters the cyclone separator 10, and the gas tar collecting device 11 after gas-solid separation. The...

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Abstract

The invention discloses a system and method for utilizing flue gas pyrolysis to perform pre-desulfurization and demercuration before combustion of high sulfur coal. The system comprise a fluidized bedpyrolyzer, a gas-solid separator, a tar collecting device, a catalytic reactor, a sulfur collecting device and a mercury trap, wherein the fluidized bed pyrolyzer is sequentially provided with a fluegas inlet, an air distribution plate, a coal powder inlet, a sulfur-fixing agent inlet, a spoiler and a gas outlet from the bottom to the top. The catalytic reactor comprises a catalytic reaction section and a cooling section. The catalytic reaction section is filled with a catalyst which is a mixture of Fe2O3 and Al2O3, and the cooling section is disposed downstream the catalytic reaction section. The sulfur collecting device is connected with the cooling section. An inlet of the mercury trap is connected to an outlet of the cooling section, and the mercury trap is filled with a mercury adsorbent which is a mixture of CeO2 and Al2O3 or sulfur-loaded activated carbon. According to the method, sulfur and mercury pollutants in coal can be removed more thoroughly, and the treatment cost is lower.

Description

technical field [0001] The invention specifically relates to a system and method for pre-desulfurization and mercury removal by pyrolysis of flue gas before combustion of medium-high sulfur coal. Background technique [0002] my country's consumption energy structure is dominated by coal, and the proportion of coal consumption in the energy structure is still very high. Medium-high sulfur coal accounts for 33% of my country's coal resources, and high-sulfur coal with a total sulfur content exceeding 2% accounts for 25% of the total reserves. The large-scale mining and utilization of high-quality bituminous coal and anthracite has caused a sharp decline in high-quality coal reserves, which has brought great hidden dangers to my country's energy security. The clean utilization of medium-high sulfur coal has been paid more and more attention, but the development and utilization of low-quality coal with relatively high sulfur content is limited by its own characteristics and te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/08C10L9/10C01B17/04
Inventor 董勇张肖阳冯远扬安东海
Owner SHANDONG UNIV
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