EP0060354B1 - Procédé d'élimination du soufre et des cendres de charbon - Google Patents

Procédé d'élimination du soufre et des cendres de charbon Download PDF

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Publication number
EP0060354B1
EP0060354B1 EP19810301043 EP81301043A EP0060354B1 EP 0060354 B1 EP0060354 B1 EP 0060354B1 EP 19810301043 EP19810301043 EP 19810301043 EP 81301043 A EP81301043 A EP 81301043A EP 0060354 B1 EP0060354 B1 EP 0060354B1
Authority
EP
European Patent Office
Prior art keywords
coal
mixture
sulphur
ash
water
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.)
Expired
Application number
EP19810301043
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German (de)
English (en)
Other versions
EP0060354A1 (fr
Inventor
George E. Brown, Jr.
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.)
Feldkamp Joseph F Jr
Original Assignee
Feldkamp Joseph F Jr
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8188236&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0060354(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Feldkamp Joseph F Jr filed Critical Feldkamp Joseph F Jr
Priority to DE8181301043T priority Critical patent/DE3171535D1/de
Priority to EP19810301043 priority patent/EP0060354B1/fr
Publication of EP0060354A1 publication Critical patent/EP0060354A1/fr
Application granted granted Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/02—Treating solid fuels to improve their combustion by chemical means

Definitions

  • High sulfur coal i.e., about 3%, exists in unmined form and also in the form of already mined coal that has been discarded, i.e., refuse coal.
  • Refuse coal usually consists of fines which result from the processing of coal. More particularly, when coal is mined it is normally crushed and washed and the washings are generally dumped and used as land fill or dumped into a lake or stream. In the latter case, over a period of time, the pond or stream becomes almost completely filled with the finely powdered coal. Not only is a significant waste of coal but it is injurious to the lakes and streams. Many lakes have become “dead” lakes dueto this disposal of waste coal. The ash content of such refuse coal, i.e., above 20% by weight, also makes it economically unattractive to attempt to utilize it.
  • a method of treating pulverised coal to remove sulphur comprises adding pickle liquor to the coal, subsequent adding to the coal of a mixture of water with chlorine gas added thereto, the amount of pickle liquor and chlorine gas being sufficient to provide a mixture having a pH of less than about 3, and physically separating the coal from the mixture.
  • the present invention is applicable to high sulphur, high ash refuse or virgin coal.
  • coal crushed to about 1/4 by 0 size (that is 1/4 inch down to 325 Tyler mesh in size­6.35 to 0.04x10- 2 m) is first treated with spent pickle liquor. Thereafter it is subjected to a strong acidic oxidizing agent. More particularly, the acidified coal mixture is treated with a mixture of chlorine gas dissolved in water. Thereafter coal and ash are separated through the use of water and gravity. Following this, the acid solution remaining is treated with lime and the precipitate which contains various sulfur compounds is discarded. These sulfur compounds exists in such a state that they are not injurious to our environment when discarded and in fact have a beneficial effect on dead lakes.
  • a method of removing ash and sulphur from coal wherein sulphur is present comprises forming a coal and water mixture from pulverized coal and a minor amount of water, treating the mixture with chlorine gas in an amount sufficient to convert the sulphur to a sulphur containing acid(s), physically separating ash and coal from the mixture, treating the remaining mixture containing the sulphur containing acid(s) with lime whereby the sulphur is precipitated as calcium salts, and physically separating the calcium salts.
  • the process of this invention can be effectively practised on any high sulphur content coal.
  • refuse coal that at the present time has no utility.
  • the refuse coal contains less than about 1% sulphur, has about 5-6% ash, has about 14,000-14,500 British thermal unit (btu) per pound (3:26-3.37x104 J/kg), and is processed into easily handled pellets.
  • btu British thermal unit
  • the refuse coal typically contains 2-3% sulphur, 25-30% ash and has a btu per pound content of only 7,500 (1.74x10 4 J/Kg).
  • Refuse coal is produced as the result of normal coal mining operations and exists as a result of coal being crushed and washed. Typically it is 1/4 by 0 and discarded as land fill or thrown into a pond, lake or stream. In some instances as much as 20% by weight of the mined coal ends up in the form of heretofore unusable refuse coal.
  • the pulverized coal is first mixed with spent pickle liquor.
  • a pickling acid to remove scale, rust, etc. Most frequently 60° Be' sulfuric acid is employed and this is the preferred form for use in the present invention although other acid pickle liquors may be employed.
  • the spent pickle liquor comprising the acid and various iron compounds such as Fe 2 (SO 4 ) 31 FeS0 4 .7H 2 0 and other contaminants must be disposed of. Obviously, the disposal of such a liquid poses a significant problem from an environmental standpoint.
  • the amount of spent pickle liquor mixed with the pulverized coal is somewhat dependent on the sulfur content of the coal. Usually though 2% pickle liquor based on the weight of the coal is sufficient.
  • the mixture is introduced into any suitable type of reactor mixture and mixed with about 20% by weight of water.
  • the water temperature and temperature of the mixture is 80-90°F (26.7-37.2°C). This may require suitable heating or cooling means of conventional design.
  • chlorine gas Into the reactor mixture is introduced chlorine gas.
  • the amount of chlorine required is an amount sufficient to provide a mixture having a pH of about 3 or less.
  • the chlorine gas provides hydrochloric acid, hypochlorous acid and nascent oxygen.
  • iron disulphide iron pyrite
  • the ash and coal that are present can be mechanically separated from each other and from the acid solution.
  • One convenient way for doing so consists of introducing the entire mixture into a conically shaped separator of conventional design, where provision is made at the bottom for introducing water. At the top a weir is provided such that material at the surface of the mixture will be transferred out of the separator and into a discharge conduit. The denser heavier coal particles fall to the bottom and are discharged through an outlet. The coal is then dried and preferably pelletized.
  • a sufficient amount of lime to precipitate most of the sulfur as calcium salts i.e., CaS0 3 , CaS, CaS0 4 or other salts of calcium containing sulfur.
  • the amount of lime required is that amount which is required to provide a neutral or nearly neutral pH.
  • Such precipitated salts are thereafter separated and preferably used as fill in coal slurry ponds. If the ponds are not totally filled but if a sufficient amount of the precipitate is added over a relatively short period of time the pond is once again capable of supporting life.
  • the coal so recovered has less than 6% ash, less than 1% sulfur and a btu content of about 14,000 per pound (3.26x 10 4 J/kg).
  • the economics of the process are such that refuse coal may be economically reclaimed to provide an excellent energy source.
  • a minor amount of water preferably in the form of steam.
  • the water added is preferably an amount equal to about 10-20 % by weight of the coal.
  • chlorine gas is added to the mixture.
  • the chlorine gas is not dissolved in water nor is pickle liquor added to the mixture.
  • the amount of water required is reduced.
  • the mixture after treatment with the chlorine gas is subjected to the separation step and thereafter to the neutralization step.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Claims (10)

1. Procédé de traitement de charbon pulverisé pour éliminer le soufre comprenant l'addition au charbon d'une liqueur de décapage, suivie d'une addition au charbon d'un mélange d'eau additionée de chlore gaseux, la quantité de liqueur de décapage et de chlore gaseux étant suffisante pour fournir un mélange dont the pH est inférieur à environ 2, ainsi que la séparation physique de charbon du mélange.
2. Procédé selon la revendication 1 caractérisé en ce qu'on neutralise avec de la chaux le mélange restant après l'élimination du charbon, de façon à fournir un précipité comprenant essentiellement des sulfates minéraux.
3. Procédé selon la revendication 1 caractérisé en ce qu'on sépare physiquement du mélange une quantité considérable de cendres simultanément à la séparation de charbon du mélange.
4. Procédé selon la revendication 3 caractérisé en ce qu'on neutralise avec de la chaux le mélange restant après l'élimination des fractions de charbon et de cendres, de façon à fournir un précipite comprenant essentiellement des sulfantes minéraux.
5. Procédé selon la revendication 3 ou 4 caractérisé en ce qu'on sépare le charbon et les cendres du mélange par moyen d'un courant d'eau.
6. Procédé selon la revendication 2 ou 4 caractérisé en ce qu'on utilise le précipité pour traiter des masses d'eaux mortes.
7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le charbon est du charbon de rébut.
8. Procédé d'élimination des cendres et du soufre du charbon comprenant du soufre caractérisé en ce qu'on forme un mélange charbon et d'eau à partir de charbon pulvérisé et d'une faible quantité d'eau, qu'on traite le mélange au chlore gazeux en quantité suffisante pour transformer le soufre en contenant un acide ou des acides, qu'on sépare physiquement des cendres et du charbon du mélange, qu'on traite avec de la chaux le mélange résiduel contenant le soufre, contenant un acide ou des acides, de sorte que le soufre se précipite sous forme de sels de calcium.
9. Procédé selon la revendication 8 caractérisé en ce que le charbon à traiter est du charbon de rébut et en ce qu'après traitement le charbon contient moins de 6% de cendres, moins d'environ 1% de soufre, et possède un pouvoir calorifique de 14.000 BTU par livre (3,26.104 J/kg).
10. Procédé selon la revendication 8 ou 9, caractérisé en ce que le faible quantité d'eau représente 10 à 20% en poids du charbon.
EP19810301043 1981-03-12 1981-03-12 Procédé d'élimination du soufre et des cendres de charbon Expired EP0060354B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8181301043T DE3171535D1 (en) 1981-03-12 1981-03-12 Method of treating coal to remove sulphur and ash
EP19810301043 EP0060354B1 (fr) 1981-03-12 1981-03-12 Procédé d'élimination du soufre et des cendres de charbon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810301043 EP0060354B1 (fr) 1981-03-12 1981-03-12 Procédé d'élimination du soufre et des cendres de charbon

Publications (2)

Publication Number Publication Date
EP0060354A1 EP0060354A1 (fr) 1982-09-22
EP0060354B1 true EP0060354B1 (fr) 1985-07-31

Family

ID=8188236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810301043 Expired EP0060354B1 (fr) 1981-03-12 1981-03-12 Procédé d'élimination du soufre et des cendres de charbon

Country Status (2)

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EP (1) EP0060354B1 (fr)
DE (1) DE3171535D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8439989B2 (en) * 2000-06-26 2013-05-14 ADA-ES, Inc. Additives for mercury oxidation in coal-fired power plants
US6729248B2 (en) 2000-06-26 2004-05-04 Ada Environmental Solutions, Llc Low sulfur coal additive for improved furnace operation
CN101497464B (zh) * 2009-01-19 2011-01-05 中国科学院山西煤炭化学研究所 一种处理酸洗废液或电镀废液的方法
CN102295969B (zh) * 2011-07-27 2013-09-18 北京科技大学 一种除去率高、用时少的同时脱除高硫煤中硫和砷的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE670964C (de) * 1933-09-15 1939-01-28 Erdoel Akt Ges Deutsche Verfahren zum Entaschen von Koks mineralischer Kohlen
US3998604A (en) * 1974-09-23 1976-12-21 International Oils Exploration N.L. Demineralization of brown coal
GB1454933A (en) * 1974-10-12 1976-11-10 Tioxide Group Ltd Process for the treatment of acidic waste liquid containing dissolved salts

Also Published As

Publication number Publication date
DE3171535D1 (en) 1985-09-05
EP0060354A1 (fr) 1982-09-22

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