WO1997034683A1 - Verfahren zur entfernung von gasförmigem elementaren quecksilber aus rohgasen in zwei hintereinandergeschalteten stufen - Google Patents
Verfahren zur entfernung von gasförmigem elementaren quecksilber aus rohgasen in zwei hintereinandergeschalteten stufen Download PDFInfo
- Publication number
- WO1997034683A1 WO1997034683A1 PCT/EP1997/001304 EP9701304W WO9734683A1 WO 1997034683 A1 WO1997034683 A1 WO 1997034683A1 EP 9701304 W EP9701304 W EP 9701304W WO 9734683 A1 WO9734683 A1 WO 9734683A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washing
- tower
- acid
- washing tower
- gases
- Prior art date
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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
Definitions
- the invention relates to a method for removing gaseous elemental mercury from raw gases in two stages connected in series, in which the raw gases are passed upwards through a scrubbing tower and brought into contact with a scrubbing acid in countercurrent in the scrubbing tower, the scrubbing acid in Head of the washing tower is introduced via a nozzle system.
- the invention further relates to a method for removing gaseous elementary mercury from crude gases in two stages connected in series, wherein the raw gases from the bottom directed upwardly through a scrubbing tower, and are contacted in the scrubbing tower with egg ⁇ 2r wash acid in countercurrent.
- DE-OS-2 207 851 describes a process for purifying gases which contain gaseous elemental mercury, in which the gases
- CONFIRMATION COPY be contacted with a washing solution in a watchtower.
- a washing solution is used that
- Mercury (II) ions in an amount between 0.02 g / 1 and the saturation state and a proportion of at least one of the ions selected from the group Cl “ , Br “ , J “ or S0 4 2" , some of which form soluble or sparingly soluble Hg (I) salts, Cl “ , Br “ , J “ or S0 4 2 'being present in such an amount that the Hg (I) formed precipitates, the corresponding Hg (I ) Salts, however, cannot be disproportionated to Hg (II) and Hg 0 .
- the washing solution is introduced into the head of the washing tower via a nozzle system.
- a disadvantage of this method is that a pressure must be set in the head of the washing tower, which is between 0.5 and 1 bar, which leads to the formation of relatively fine mist in the immediate vicinity of the nozzle system, which are exposed to the elementary mercury and discharged from the wash tower together with the clean gas.
- the invention is therefore based on the object of providing a method for removing gaseous elemental mercury from raw gases in two stages connected in series, in which the introduction of fine mist laden with elementary mercury into the clean gas line is avoided. Furthermore, the method should also be able to be used in existing systems, such as are known from DE-OS 2 207 851, without major design effort.
- the object on which the invention is based is achieved in that washing acid with a pressure of 1 to 5 bar is additionally injected into the raw gas line which is connected to the washing tower, a pressure of 0.01 to 0.5 in the head of the washing tower bar is set.
- raw gases is to be understood as meaning those gases which contain elemental mercury, such as, for example, the exhaust gases which are formed when minerals containing mercury are roasted or in chlor-alkali processes and when certain catalysts containing mercury are regenerated.
- Liquids which are described as washing solutions in DE-OS 2 207 851 can be used as washing acid.
- the head of the scrubbing tower means the upper part of the scrubbing tower, which is connected to the clean gas line.
- the raw gases are fed to the sump of the washing tower through the raw gas line.
- the washing acid can be injected into the raw gas line via various nozzle systems, the individual nozzles being arranged in such a way that the washing acid can be injected largely over the entire flow cross section of the raw gas line. It has surprisingly been found that with the process for removing gaseous elemental mercury from raw gases the formation of a fine mist of loaded washing acid in the head of the washing tower can be avoided, the degree of separation would be improved since no mist laden with elementary mercury thus gets into the clean gas.
- the method can also be integrated relatively easily into already existing plants, since the raw gas line of the already existing plant therefore only has to be provided with a connection for the washing acid used. It is also advantageous that the gaseous elemental mercury is separated from the raw gases in the first stage in the raw gas line by up to 90% before the raw gases reach the scrubbing tower in the second stage.
- a preferred embodiment of the invention is that the pressure set in the head of the washing tower is 0.1 to 0.2 bar. At this pressure, droplets of washing acid with almost the same diameter are formed in the head of the washing tower. This has an advantageous effect on the separation of the gaseous elemental mercury.
- the object on which the invention is based is further achieved in that the washing acid is introduced into the head of the washing tower via at least one floor and that washing acid is additionally injected into the raw gas line which is connected to the washing tower at a pressure of 1 to 5 bar.
- Grid floors, rain screen floors, wave screen floors or smock floors can be used as floors.
- the floor can also be designed in the form of a ring system with an overflow weir.
- a lattice floor is to be understood to mean a floor which, for example, consists of expanded metal bars which leave the slots free for the passage of crude gas and washing acid.
- the raw gases and the washing acid must pass through the same openings.
- at the rain sieve bottom is a sieve bottom without inlet and outlet weir.
- the raw gases and the washing acid must flow through the holes together.
- the bottom of the corrugated screen has a plate that is not corrugated horizontally, but sinusoidally.
- the raw gases preferably flow through the holes in the wave crest, and the washing acid flows through the holes in the wave valley.
- the smock bottom is a slotted bottom made of expanded metal. The slots are aligned so that the wash acid gets a push in certain directions. This facilitates the homogeneous distribution of the washing acid over the entire cross section of the washing tower.
- mist formed from the washing acid
- the arrangement of a base will be sufficient to distribute the washing liquid homogeneously over the cross section of the washing tower. In some cases, however, it can be advantageous to arrange two or three shelves one above the other.
- the adjustment of a pressure of ⁇ 0.5 in the head of the scrubbing tower bar is not needed, provided that at least a bottom is arranged in the head of the scrubbing tower, is on the the washing acid in the scrubbing tower einger ⁇ eight.
- the injection of additional washing acid into the raw gas line at a pressure of 1 to 5 bar also enables elemental mercury to be separated from the raw gases in the raw gas line by up to 90% in this process. Since the floor or floors can be arranged in the head of the washing tower in a relatively simple manner, this method is also advantageously suitable to be used in already existing plants.
- the washing acid is introduced into the head of the washing tower via at least one rain screen floor.
- the rain screen bottom is advantageously relatively simple and enables the vertical arrangement of tubes in the individual bores, which advantageously have a length of 3 to 6 cm.
- the washing acid can advantageously remain on the bottom of the sieve and be collected before it passes through the individual tubes from above and flows downwards. This measure also advantageously facilitates the homogeneous distribution of the washing acid in the top of the washing tower.
- FIG. 1 shows a simplified schematic illustration of the system used to carry out the method according to the invention.
- the method according to the invention is shown schematically in FIG.
- the raw gases flow in the raw gas line (1) to the bottom of the washing tower (2).
- the raw gases are contacted with scrubbing acid, which is introduced into the scrubbing tower (2) at the top (2 ') of the scrubbing tower (2).
- the method is shown in which the washing acid is introduced via a nozzle system (10).
- a pressure of 0.01 to 0.5 bar is set at the top (2 ') of the washing tower (2).
- the washing acid collected in the sump of the washing tower (2) passes via line (7) into the Storage container (4).
- the washing acid comes from the storage tank (4) via the first pump (5) and the line (3) to the head (2 ! ) Of the washing tower (2).
- washing acid is additionally injected from the storage container (4) into the raw gas line (1).
- additional washing acid is fed via line (9) to the storage container (4) at intervals of several hours.
- the clean gas leaves the scrubbing tower (2) via the clean gas line (6).
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97908239A EP0888167A1 (de) | 1996-03-16 | 1997-03-14 | Verfahren zur entfernung von gasförmigem elementaren quecksilber aus rohgasen in zwei hintereinandergeschalteten stufen |
AU20275/97A AU714731B2 (en) | 1996-03-16 | 1997-03-14 | Methods of removing gaseous elementary mercury from raw gases in two successive stages |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996110444 DE19610444C1 (de) | 1996-03-16 | 1996-03-16 | Verfahren zur Entfernung von gasförmigem elementaren Quecksilber aus Rohgasen in zwei hintereinandergeschalteten Stufen |
DE19610444.0 | 1996-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997034683A1 true WO1997034683A1 (de) | 1997-09-25 |
Family
ID=7788535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001304 WO1997034683A1 (de) | 1996-03-16 | 1997-03-14 | Verfahren zur entfernung von gasförmigem elementaren quecksilber aus rohgasen in zwei hintereinandergeschalteten stufen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0888167A1 (de) |
AU (1) | AU714731B2 (de) |
CA (1) | CA2247997A1 (de) |
DE (1) | DE19610444C1 (de) |
WO (1) | WO1997034683A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998053900A1 (en) * | 1997-05-26 | 1998-12-03 | Boliden Contech | A method and apparatus for removing gaseous elementary mercury from a gas |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104524952B (zh) * | 2015-01-13 | 2016-08-31 | 崔涛 | 一种烟气处理设备 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2201481A1 (de) * | 1971-01-14 | 1972-08-03 | Norske Zinkkompani As | Verfahren zur Entfernung von Quecksilber aus Gasen |
DE2207851A1 (de) * | 1971-02-23 | 1972-08-31 | Boliden Ab | Verfahren zum Reinigen von Gasen, die gasförmiges elementares Quecksilber enthalten |
DE2135086A1 (de) * | 1971-07-14 | 1973-02-01 | Basf Ag | Verfahren zur entfernung von quecksilber aus gasen |
DE3213685A1 (de) * | 1981-04-15 | 1982-11-18 | Outokumpu Oy, 00100 Helsinki | Verfahren und vorrichtung zum entfernen von quecksilber aus schwefeldioxidhaltigen heissen und feuchten gasen |
WO1984002123A1 (en) * | 1982-12-03 | 1984-06-07 | Boliden Ab | A method for producing pure sulphuric acid and a high-grade mercury product from gases that contain sulphur dioxide and mercury |
EP0623379A1 (de) * | 1993-05-07 | 1994-11-09 | Thyssen Industrie Ag | Verfahren zur Reinigung von Rauchgasen die elementares Quecksilber enthalten |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE396772B (sv) * | 1975-09-16 | 1977-10-03 | Boliden Ab | Forfarande for extraktion och utvinning av kvicksilver ur gaser |
-
1996
- 1996-03-16 DE DE1996110444 patent/DE19610444C1/de not_active Expired - Fee Related
-
1997
- 1997-03-14 EP EP97908239A patent/EP0888167A1/de not_active Withdrawn
- 1997-03-14 CA CA 2247997 patent/CA2247997A1/en not_active Abandoned
- 1997-03-14 AU AU20275/97A patent/AU714731B2/en not_active Ceased
- 1997-03-14 WO PCT/EP1997/001304 patent/WO1997034683A1/de not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2201481A1 (de) * | 1971-01-14 | 1972-08-03 | Norske Zinkkompani As | Verfahren zur Entfernung von Quecksilber aus Gasen |
DE2207851A1 (de) * | 1971-02-23 | 1972-08-31 | Boliden Ab | Verfahren zum Reinigen von Gasen, die gasförmiges elementares Quecksilber enthalten |
DE2135086A1 (de) * | 1971-07-14 | 1973-02-01 | Basf Ag | Verfahren zur entfernung von quecksilber aus gasen |
DE3213685A1 (de) * | 1981-04-15 | 1982-11-18 | Outokumpu Oy, 00100 Helsinki | Verfahren und vorrichtung zum entfernen von quecksilber aus schwefeldioxidhaltigen heissen und feuchten gasen |
WO1984002123A1 (en) * | 1982-12-03 | 1984-06-07 | Boliden Ab | A method for producing pure sulphuric acid and a high-grade mercury product from gases that contain sulphur dioxide and mercury |
EP0623379A1 (de) * | 1993-05-07 | 1994-11-09 | Thyssen Industrie Ag | Verfahren zur Reinigung von Rauchgasen die elementares Quecksilber enthalten |
Non-Patent Citations (1)
Title |
---|
"Ullmanns Encyklopädie der technischen Chemie", XP002035221 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998053900A1 (en) * | 1997-05-26 | 1998-12-03 | Boliden Contech | A method and apparatus for removing gaseous elementary mercury from a gas |
EA000771B1 (ru) * | 1997-05-26 | 2000-04-24 | Булиден Контех Аб | Способ и установка для удаления из газа газообразной элементарной ртути |
CZ298739B6 (cs) * | 1997-05-26 | 2008-01-16 | Boliden Contech Ab | Způsob odstraňování plynné elementární rtuti z plynu a zařízení k provádění tohoto způsobu |
Also Published As
Publication number | Publication date |
---|---|
AU2027597A (en) | 1997-10-10 |
DE19610444C1 (de) | 1997-05-07 |
AU714731B2 (en) | 2000-01-13 |
EP0888167A1 (de) | 1999-01-07 |
CA2247997A1 (en) | 1997-09-25 |
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