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In-furnace desulfurization method of circulating fluidized bed boiler

A circulating fluidized bed and boiler furnace technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of insufficient desulfurization efficiency and low utilization rate of desulfurization agents, and achieve the improvement of desulfurization efficiency in the furnace. Economical and environmentally friendly, the effect of reducing the amount of use

Active Publication Date: 2018-01-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a circulating fluidized bed boiler furnace desulfurization method to solve the problems of insufficient desulfurization efficiency and low utilization rate of desulfurizer in the existing circulating fluidized bed combustion desulfurization method, so as to reduce the cycle Fluidized bed combustion sulfur dioxide emission concentration, avoiding overly expensive additional desulfurization equipment, significantly improving economic and social benefits

Method used

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Effect test

Embodiment 1

[0036] 1) Limestone is crushed into limestone powder with an average particle size of 14 μm and a maximum particle size of 43 μm, which is mixed with fuel and then introduced into the furnace of the circulating fluidized bed; the boiler has an evaporation capacity of 220t / h and a main steam pressure of 12.5MPa Circulating fluidized bed boiler;

[0037] 2) The boiler separator has been modified, and the escape particle size of fly ash obtained under full load conditions is: d 50 = 11 μm, d 90 = 52 μm;

[0038] 3) Adjust the total combustion air volume and coal feed volume so that the oxygen content at the separator outlet is 2.95%.

[0039] 4) Control the average temperature of the furnace to 845°C, the temperature in the dilute phase zone to 830°C, and the temperature in the dense phase zone to 860°C.

[0040] 5) Increase the primary air volume, adjust the ratio of primary air and secondary air volume to 1.1:1, so that the pressure difference in the dilute phase zone reache...

Embodiment 2

[0043] 1) The limestone is pulverized into limestone powder with an average particle size of 10 μm and a maximum particle size of 35 μm. The fuel is injected into the secondary air pipe, and enters the furnace of the circulating fluidized bed along with the secondary air; the boiler is a circulating fluidized bed boiler with an evaporation capacity of 240t / h and a main steam pressure of 13.73MPa;

[0044] 2) The boiler separator has been modified, and the escape particle size of fly ash obtained under full load conditions is: d 50 = 10 μm, d 90 = 49 μm;

[0045] 3) The circulating fluidized bed boiler is equipped with a selective slag discharge device, and the slag discharge port is arranged away from the return valve to increase the slag discharge granularity and improve the circulation flow rate;

[0046] 4) Adjust the total combustion air volume and coal feed volume so that the oxygen content at the outlet of the separator is 3.05%.

[0047] 5) Control the average temper...

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Abstract

The invention discloses an in-furnace desulfurization method of a circulating fluidized bed boiler, and relates to the technical field of combustion and desulfurization of circulating fluidized beds.The in-furnace desulfurization method comprises the step of spraying a limestone desulfurizing agent into a furnace, wherein the maximum particle size of limestone desulfurizing agent granules is defined to not exceed 45[mu]m and an average particle size of the limestone desulfurizing agent granules is defined to be 5-20[mu]m; and meanwhile particle sizes of escaped granules of a separator outletare required to be d50<12[mu]m and d90<55[mu]m, and differential pressure of a lean-phase zone is kept at 1-2kPa. According to the in-furnace desulfurization method, sulfur dioxide emission concentration lower than 35mg / Nm<3> is achieved for a coal type with an as-received basis sulfur content less than 2% under the condition of a calcium to sulfur molar ratio less than 2; and meanwhile, the problem that in-furnace desulfurization efficiency of an existing circulating fluidized bed boiler is lower is effectively solved.

Description

technical field [0001] The invention relates to a desulfurization method in a circulating fluidized bed boiler, belonging to the technical field of circulating fluidized bed combustion and desulfurization. Background technique [0002] Circulating fluidized bed combustion technology is currently the best commercial clean fuel combustion technology, which has the advantages of strong fuel adaptability and low pollutant emissions. The circulating fluidized bed desulfurization usually adopts the method of calcium spraying in the furnace to reduce the emission concentration of sulfur dioxide at the outlet of the separator. In the traditional calcium spraying desulfurization process in the furnace, the particle size of the limestone used is generally less than 1mm, and its average particle size is greater than 50μm, usually 200-300μm. The specific surface area of ​​the particles participating in the chemical reaction is too small, the overall desulfurization efficiency and desul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/83
Inventor 蔡润夏张缦吕俊复杨海瑞刘青张海吴玉新张扬
Owner TSINGHUA UNIV