BURNING METHOD FOR COMBUSTIBLE MATERIAL CONTAINING CHLORINE CAPABLE OF SUPPRESSING GENERATION OF DIOXINS

PURPOSE:To set a dioxin concentration to an expected value of a guide line of the Ministry of Health and Welfare by removing Cl2 gas or HCl gas becoming a cause of generating the dioxin in a burning step by using calcium of a special value. CONSTITUTION:Combustible material 1 containing chlorine is...

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Bibliographic Details
Main Authors TAGASHIRA KENJI, ARAKAWA YOSHIHISA, HANEDA TOSHIO, ODA NAOYOSHI, FUJIMA YUKIHISA
Format Patent
LanguageEnglish
Published 08.03.1994
Edition5
Subjects
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
CONSUMING WASTE PRODUCTS BY COMBUSTION
CREMATION FURNACES
HEATING
LIGHTING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
WEAPONS
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Summary:PURPOSE:To set a dioxin concentration to an expected value of a guide line of the Ministry of Health and Welfare by removing Cl2 gas or HCl gas becoming a cause of generating the dioxin in a burning step by using calcium of a special value. CONSTITUTION:Combustible material 1 containing chlorine is conveyed from under a banker 3 to a feeder 4, and supplied to a circulation fluidized layer boiler combustor 5 by compressed air. Limestone 6 containing calcium corresponding to 2.5 or more by a molar ratio to a total amount of half of chlorine and sulfur contained in the material 1 together with calcium content contained in the material 1 is charged in the combustor 5. The material is burned in the combustor 5, generated HCl gas is reacted with a surface layer of CaO to be formed from limestone particles, the sulfur is reacted with the surface layer of the CaO, and a CaCl2 layer, a CaSO4 layer are formed in the surface layer of unreacted core. Thus, even in the material containing the chlorine can be so set that an outlet dioxin concentration of a bag filter is set to 0.5 ngTEQ/Nm or less.
Bibliography:Application Number: JP19920215808