JPS5765314A - Treatment of fly ash - Google Patents

Treatment of fly ash

Info

Publication number
JPS5765314A
JPS5765314A JP55140866A JP14086680A JPS5765314A JP S5765314 A JPS5765314 A JP S5765314A JP 55140866 A JP55140866 A JP 55140866A JP 14086680 A JP14086680 A JP 14086680A JP S5765314 A JPS5765314 A JP S5765314A
Authority
JP
Japan
Prior art keywords
water
salt
fly ash
sent
coal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55140866A
Other languages
Japanese (ja)
Inventor
Naohiko Ugawa
Kikuji Tsuneyoshi
Michio Oshima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP55140866A priority Critical patent/JPS5765314A/en
Publication of JPS5765314A publication Critical patent/JPS5765314A/en
Pending legal-status Critical Current

Links

Landscapes

  • Gasification And Melting Of Waste (AREA)
  • Treating Waste Gases (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

PURPOSE: To recover a NH4 salt as well as to decompose the same into harmless N2 or the like by a method wherein fly ash collected in a dust collector apparatus positioned at a posterior stage of a denitration apparatus using NH3 for treating an exhaust gas from a coal fired boiler is washed by water and a washing liquid containing the NH4 salt is returned to a firing furnace of said boiler.
CONSTITUTION: To fly ash (a) adhered with an NH4 salt collected in a dust collector apparatus 4, recirculated water (e) for ash transportation is added and the resultant mixture is sent to a precipitation tank 5. Then, a part of supernatant water (c) from the tank 5 is returned as water (e) and a residual part thereof is sent to an NH4 concentrating apparatus 6 and concentrated at a concn. ratio of at least 10 times. Next, the obtained NH4 salt concentrated water (h) is coated on coal (i) and thereafter, the resultant coated coal is sent to a firing furnace of a boiler through a coal transporting line (c) and decomposed therein. On the other hand, recylce water (g) after the NH4 salt is removed therefrom is again sent to the apparatus 4 as water (e) to be reutilized. Moreover, a slurry (b) of a bottom part of the tank 5 is dehydrated in a dehydrator apparatus 7 and, thereafter, fly ash (i) free from the NH4 salt is obtained and discarded or subjected to usual fly ash use.
COPYRIGHT: (C)1982,JPO&Japio
JP55140866A 1980-10-08 1980-10-08 Treatment of fly ash Pending JPS5765314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55140866A JPS5765314A (en) 1980-10-08 1980-10-08 Treatment of fly ash

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55140866A JPS5765314A (en) 1980-10-08 1980-10-08 Treatment of fly ash

Publications (1)

Publication Number Publication Date
JPS5765314A true JPS5765314A (en) 1982-04-20

Family

ID=15278558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55140866A Pending JPS5765314A (en) 1980-10-08 1980-10-08 Treatment of fly ash

Country Status (1)

Country Link
JP (1) JPS5765314A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539001C1 (en) * 1985-11-02 1986-09-11 Rheinisch-Westfälisches Elektrizitätswerk AG, 4300 Essen Process for reducing the nitrogen oxide content in the flue gas stream of a power plant boiler with flue gas cleaning system
WO1999048563A1 (en) * 1998-03-26 1999-09-30 Board Of Control For Michigan Technological University Method for removal of ammonia from fly ash
JP2003053298A (en) * 2001-08-21 2003-02-25 Kurita Water Ind Ltd Incineration ash processing equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539001C1 (en) * 1985-11-02 1986-09-11 Rheinisch-Westfälisches Elektrizitätswerk AG, 4300 Essen Process for reducing the nitrogen oxide content in the flue gas stream of a power plant boiler with flue gas cleaning system
WO1999048563A1 (en) * 1998-03-26 1999-09-30 Board Of Control For Michigan Technological University Method for removal of ammonia from fly ash
US6290066B1 (en) 1998-03-26 2001-09-18 Board Of Control For Michigan Technological University Method for removal of ammonia from fly ash
JP2003053298A (en) * 2001-08-21 2003-02-25 Kurita Water Ind Ltd Incineration ash processing equipment

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