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WO1993002774A1 - Procede de production d'hydroxyde de calcium pour absorption sur lit fluidise - Google Patents

Procede de production d'hydroxyde de calcium pour absorption sur lit fluidise Download PDF

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Publication number
WO1993002774A1
WO1993002774A1 PCT/US1992/006278 US9206278W WO9302774A1 WO 1993002774 A1 WO1993002774 A1 WO 1993002774A1 US 9206278 W US9206278 W US 9206278W WO 9302774 A1 WO9302774 A1 WO 9302774A1
Authority
WO
WIPO (PCT)
Prior art keywords
gaseous medium
calcium hydroxide
reaction
zone
solids
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.)
Ceased
Application number
PCT/US1992/006278
Other languages
English (en)
Inventor
Preston L. Veltman
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.)
GEA Process Engineering AS
Original Assignee
Niro AS
Niro Atomizer AS
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 Niro AS, Niro Atomizer AS filed Critical Niro AS
Publication of WO1993002774A1 publication Critical patent/WO1993002774A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound

Definitions

  • the subject invention will be discussed primarily hereinafter with reference to the removal of sulfur containing materials such as sulfur dioxide from a flue gas, it is to be understood that the use and the application of the subject invention is not thereby so limited.
  • the invention may be useful in the removal of other undesirable components from flue gases or for the removal of components in other industrial or like processes where a gas or gases are to be treated to remove and/or recover components contained in the gases.
  • Treated flue gas exits the top of absorber 1fi through line 19 and contains entrained particulates including compounds of calcium and sulfur as well as unreacted hydrated lime. These particulates are removed from the flue gas in separator 20 and flue gas containing a reduced amount of sulfur containing materials exits the precipitator through line 22. Recovered particulates from precipitator 20 in line 23 are sent by line 24 to ash silo 26 for ultimate disposal and are also recycled by line 28 to absorber 16 to utilize unreacted calcium hydrate values.
  • the subject invention is directed in one of its aspects to a process for the removal of acidic materials from a gaseous medium by contact with nascent particulate calcium hydrate produced, suspended and conveyed in a gaseous medium.
  • the subject process is described hereinafter with reference to a particularly preferred process for the removal of sulfur containing components or materials such as sulfur dioxide from a flue gas.
  • Flue gas fed to mill 38 by blower 36 tends to sweep the mill and serves as a suspending medium in the mill for the formed calcium hydroxide particulates and also as a conveying medium to carry fine particulates produced in the mill through exit line 46 into absorber 32.
  • absorber 32 flue gas from line 30 to the absorber and particulates from line 46 as well as recycled particulates via line 58 are agitated together to form a fluidized bed where intimate contact between the hydrated lime particles and the sulfur dioxide containing flue gas occurs. With such contact, sulfur dioxide contained in the flue gas reacts with the hydrated lime to produce particulate compounds of calcium and sulfur such as sulfates and sulfites and thus cause removal of sulfur from the flue gas.
  • Effluent flue gas from absorber 32 which is carried in line 48 is fed to gas-solid separator 52 where the particulate solids are essentially completely separated from the flue gas. Flue gas containing a reduced amount of sulfur containing materials exits the separator through line 53 leading to the atmosphere, a stack or the like.
  • Separator 52 may be a conventional bag house, an electrostatic precipitator or the other known gas-solid separator. Particulates obtained from separator 52 which contain the above mentioned sulfates and sulfites as well as unreacted calcium hydroxide and hydrates are withdrawn through line 54 and then divided. A portion of the particulates is sent through line 56 for ultimate disposal, another portion may be recycled or recirculated via line 58 to absorber 32 and another portion may be also recycled by line 60 to mill 38.
  • Curve A of Fig. 4 shows the Ca/S ratio required to obtain 95% sulfur dioxide capture using conventional dry slaked lime. More specifically, for start up and operation of such a facility or system, the following steps are then taken. First, flue gas is passed through the system via lines 30 and 34 at the design rate until the entire system is heated to a temperature above about 100° C. Then, spent sorbent is obtained from a source (not shown) and a circulating fluid bed - is established in absorber 32 for start-up purposes. The amount of flue gas supplied by blower 36 to mill 38 must be adequate to pneumatically convey reacted lime material through the mill and via line 46 into the circulating fluid bed of absorber 32,
  • nascent calcium hydroxide particulates are conveyed while suspended in the gaseous medium to the point at which the particulates are immediately utilized such as in a circulating fluid bed absorber.
  • the nascent calcium hydroxide particulates are admixed with circulating material in the fluidized bed including sorbent particulates which contain reaction products.
  • the process may be useful for the removal of other undesirable components of gas stream which are capable of producing acidic substances such as for example, combustion products from various fuels or waste or process gases from various industrial processes.
  • acidic substances such as for example, combustion products from various fuels or waste or process gases from various industrial processes.
  • these compounds including sulfur dioxide are referred to herein as acid moieties.
  • the process described above with reference to Figure 3 uses a portion of the entering flue gas as the gaseous medium for entraining the particulate sorbent
  • other gaseous media may be used in the process of the invention either alone or in conjunction with the flue gas.
  • the gaseous medium could be ambient or heated air, another waste gas or the like.
  • the gas is preferably at an elevated temperature for the considerations mentioned above.
  • the flue gas to be treated is used as the gaseous medium for conveying the particulate sorbent, a major portion of the flue gas enters the absorber directly and a minor portion of the flue gas is used for conveying the sorbent.
  • the absorber used in the subject process is a circulating fluidized bed absorber.
  • the absorber is a venturi type absorber with gas flow being directed upwardly through a constriction located near the lower portion of the absorber.
  • Other types of fluidized bed absorbers may also be used for the process of the present invention although the type of absorber illustrated is presently preferred.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé de traitement d'un gaz, par exemple la désulfuration de gaz de fumée. Le procédé comprend la trituration d'oxyde de calcium dans un premier milieu gazeux en écoulement contenant de l'eau dans une zone de trituration afin de former des particules d'hydroxyde de calcium en suspension dans le premier milieu gazeux. Les particules dans le premier milieu gazeux sont mises en contact avec un second milieu gazeux contenant au moins une fraction acide réagissant avec l'hydroxyde de calcium dans une zone de réaction de recirculation pendant un intervalle de temps suffisant pour obtenir une réaction entre l'hydroxyde de calcium et la fraction acide afin d'obtenir un produit de réaction solide. Un troisième milieu gazeux comprenant des particules et des produits de réaction solides est retiré de la zone de réaction et au moins certains des solides du troisième milieu gazeux sont séparés et au moins une partie des solides séparés est recyclée vers au moins l'une des zones de réaction et de trituration.
PCT/US1992/006278 1991-08-01 1992-07-30 Procede de production d'hydroxyde de calcium pour absorption sur lit fluidise Ceased WO1993002774A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73902191A 1991-08-01 1991-08-01
US739,021 1991-08-01

Publications (1)

Publication Number Publication Date
WO1993002774A1 true WO1993002774A1 (fr) 1993-02-18

Family

ID=24970481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/006278 Ceased WO1993002774A1 (fr) 1991-08-01 1992-07-30 Procede de production d'hydroxyde de calcium pour absorption sur lit fluidise

Country Status (2)

Country Link
PT (1) PT100747A (fr)
WO (1) WO1993002774A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007591A1 (fr) * 1992-09-25 1994-04-14 Niro A/S Procede de production d'hydroxyde de calcium destine a l'absorption
US6970634B2 (en) 2001-05-04 2005-11-29 Cascade Microtech, Inc. Fiber optic wafer probe
FR2883772A1 (fr) * 2005-03-30 2006-10-06 Lab Sa Sa Procede et installation d'epuration de fumees contenant des polluants acides
CN115090252A (zh) * 2022-08-24 2022-09-23 大唐环境产业集团股份有限公司 一种改性钙基吸附剂及其制备方法和应用

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128589A2 (fr) * 1983-06-14 1984-12-19 Sydkraft Ab Méthode pour la purification des gaz de fumée et installation pour la réalisation de la méthode
EP0128698A1 (fr) * 1983-06-03 1984-12-19 A/S Niro Atomizer Procédé et réacteur de désulphuration de gaz d'échappement chauds
US4544542A (en) * 1984-04-16 1985-10-01 Dorr-Oliver Incorporated Method for oxidation of flue gas desulfurization absorbent and the product produced thereby
EP0182706A1 (fr) * 1984-11-12 1986-05-28 Syprim Air Industrie Environnement Procédé de captation par voie semi-sèche de polluants contenus dans des fumées
EP0211458A1 (fr) * 1985-07-20 1987-02-25 Rolf Dr. Graf Procédé pour éliminer de la matière nocive de gaz de fumée
EP0492167A2 (fr) * 1990-11-28 1992-07-01 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif pour la désulfurisation de gas d'échappement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128698A1 (fr) * 1983-06-03 1984-12-19 A/S Niro Atomizer Procédé et réacteur de désulphuration de gaz d'échappement chauds
EP0128589A2 (fr) * 1983-06-14 1984-12-19 Sydkraft Ab Méthode pour la purification des gaz de fumée et installation pour la réalisation de la méthode
US4544542A (en) * 1984-04-16 1985-10-01 Dorr-Oliver Incorporated Method for oxidation of flue gas desulfurization absorbent and the product produced thereby
EP0182706A1 (fr) * 1984-11-12 1986-05-28 Syprim Air Industrie Environnement Procédé de captation par voie semi-sèche de polluants contenus dans des fumées
EP0211458A1 (fr) * 1985-07-20 1987-02-25 Rolf Dr. Graf Procédé pour éliminer de la matière nocive de gaz de fumée
EP0492167A2 (fr) * 1990-11-28 1992-07-01 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif pour la désulfurisation de gas d'échappement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007591A1 (fr) * 1992-09-25 1994-04-14 Niro A/S Procede de production d'hydroxyde de calcium destine a l'absorption
US6970634B2 (en) 2001-05-04 2005-11-29 Cascade Microtech, Inc. Fiber optic wafer probe
FR2883772A1 (fr) * 2005-03-30 2006-10-06 Lab Sa Sa Procede et installation d'epuration de fumees contenant des polluants acides
EP1716910A3 (fr) * 2005-03-30 2007-12-19 Lab Sa Procédé et installation d'épuration de fumées contenant des polluants acides
CN115090252A (zh) * 2022-08-24 2022-09-23 大唐环境产业集团股份有限公司 一种改性钙基吸附剂及其制备方法和应用

Also Published As

Publication number Publication date
PT100747A (pt) 1993-10-29

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