CN103131501B - A kind of high sodium coal intermittent type takes off sodium purifying method - Google Patents
A kind of high sodium coal intermittent type takes off sodium purifying method Download PDFInfo
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- CN103131501B CN103131501B CN201310095748.XA CN201310095748A CN103131501B CN 103131501 B CN103131501 B CN 103131501B CN 201310095748 A CN201310095748 A CN 201310095748A CN 103131501 B CN103131501 B CN 103131501B
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Abstract
The invention discloses a kind of high sodium coal intermittent type and take off sodium purifying method, the method is by repeatedly changing temperature and pressure in reaction vessel, the acute variation making high sodium coal stand temperature and pressure in purifying vessel produces repeatedly presses place and expansion, repeatedly destroy the balance of raw coal structure, the basic metal such as the sodium in high sodium coal surface and pore are made migration to occur rapidly and dissolve, make the elements such as a large amount of basic metal comprise sodium, potassium, mercury, sulphur, ashes etc. migrate in a large number or be dissolved in water-based washing soln, to reach the object to raw coal upgrading purification.<pb pnum="1" />
Description
Technical field
The invention belongs to the clean field of coal, particularly relate to a kind of high sodium coal and take off sodium purifying method.
Background technology
High sodium coal refers to the special coal of a class that in coal, alkali metal compound composition is higher.In all kinds of alkali metal compound, generally in the majority with sodium compound, therefore be referred to as " high sodium coal ", coalfield, the standard east alkali metal content of Junggar Basin, Xinjiang, china east is higher, therefore, also belongs to high sodium coal.
At present, accurate eastern coalfield resources reserves reach 3,900 hundred million tons, and verifying coal resources reserves is 2,136 hundred million tons, coalfield coal-forming area 1.4 ten thousand square kilometres, are the current maximum self-contained coalfields of China.Calculate with present coal in China annual production, an eastern coalfield of standard just can use 100 years in the whole nation.
The ature of coal in area, accurate east has following characteristics: higher moisture; Medium calorific value; Easily catch fire, easy to burn out; Strong coking; High basic metal content, strong contamination.The result of trial operation of small-load generators shows: when accurate eastern high sodium coal is used for power station, power station fire coal, very serious at the heating surface of boiler, economizer, air preheater contamination problems, basic metal is also very serious to the bulk material corrosion of boiler, and deslagging is also very difficult.Therefore, strong coking and strong contamination propose huge challenge to the design and operation firing accurate eastern coal utility boiler, and during full combustion accurate eastern coal, boiler slagging and heating surface contamination problems are very serious, and boiler cannot long-time running.Trace it to its cause, these problems are all higher closely related with alkali metal content in coal ash.
Each electricity power enterprise builds the combustion system in power station in area, accurate east, carries out mixing burning after can only adopting the accurate eastern coal in the locality of 20-30% and other not mixing containing sodium coal.The eastern coal utilization of such aligning is very limited, local power plant is coal-fired from other local purchase high-quality again simultaneously, the construction in the cost of electricity-generating so not only adding electricity power enterprise but also the exploitation of aiming at eastern coalfield and power supply base brings very large difficulty, and the advantage of aiming at eastern coal is like this difficult to be fully played.
For what generate electricity, burning way is mixed to the accurate eastern high sodium coal of employing: substantially all adopt a, admix the silicon of a fixed number; B, aluminium sesquioxide etc.; C, add other fire coal and mix burning; This several mode all belongs to stove combustion settling mode, though certain contamination of improvement boiler and the problem of slagging scorification can be played, but turn increase the effect of attrition boiler work-ing life of boiler and reduce coal-fired calorific value, this makes the running cost that must increase construction investment and power plant again simultaneously.
Therefore, how to reduce the alkali metal content in accurate eastern coal, Anti-slagging, contamination and corrosion, guarantee safe and economical boiler operation over a long time, being electricity power enterprise and the unavoidable problem of other industry using accurate eastern coal, is also the significant challenge that the accurate eastern coal-electricity base construction of current development faces.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly high sodium coal can be become low sodium coal or the method without sodium coal, method provided by the invention can remove the basic metal in coal outside stove, thus fundamentally solves the problems such as the combustion slagging that faces of high sodium coal power generation unit and heating surface stains, corrosion.
For solving the problems of the technologies described above, patent of the present invention adopts following technical scheme:
A kind of high sodium coal intermittent type takes off sodium purifying method, and it comprises the steps:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution be the long-pending 3-5 of high sodium coal body doubly; Containing acetic acid or hydrochloric acid in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add hot water or steam, and the temperature of the purifying vessel making this airtight rises to 150-350 DEG C and pressure rises to 3-5.0Mpa;
S4, then stablize 2-3 minute after be cooled to 30-60 DEG C, be depressurized to 0.1-1Mpa;
S5, after 3-5 minute, will be warming up to 150-350 DEG C again, boosting is strong to 3-5.0Mpa;
S6, repetition above-mentioned steps S4 and S5 5-8 time altogether.
The high sodium coal that method of the present invention makes is with the repeated multiple times extruding of the change of the temperature of reaction vessel, pressure, the acute variation that high sodium coal stands temperature and pressure in purifying vessel produces repeatedly pressure place and expansion, and the sodium in the high sodium coal space made moves about in Aqueous wash solution.High sodium coal intermittent type method for removing Na of the present invention, the basic metal in high sodium coal can be made to obtain effective elimination, and the decreasing ratio of its sodium is up to 96%.
The mass percentage content that described acetic acid or hydrochloric acid account for Aqueous wash solution is 8-15%.
Another aspect of the present invention comprises step further: the coal after purification is implemented coal liquid and is separated.
The one side that the present invention also has comprises step: carry out drying treatment to the coal after purification.
Method of the present invention also comprises step: the process of waste liquid water treatment device.
Method of the present invention also comprises step further: the waste liquid after process is entered above-mentioned steps 1, recycle.
Method of the present invention by repeatedly destroying raw coal the balance of raw coal structure under the effect of certain temperature and pressure and Aqueous wash solvent, the basic metal such as the sodium in high sodium coal surface and pore are made migration to occur rapidly and dissolve, make the elements such as a large amount of basic metal comprise sodium, potassium, mercury, sulphur, ashes etc. migrate in a large number or be dissolved in water-based washing soln, to reach the object to raw coal upgrading purification.
Method of the present invention is set about from the raw coal of high sodium coal, the technology of the alkali metal content in raw coal is reduced outward at stove, coal is become for the purpose of high-quality Filter Tuber For Clean Coal, thus significantly improve or fundamentally solve the significant problems such as the combustion slagging that faces of high sodium coal power generation unit and heating surface stains, corrosion, aim at eastern coal and make full use of, with development of the West Regions, there is great economic worth and social effect.
Method of the present invention is that the pulverized coal preparation system in power station, coal are dry, the preconditioning technique of Coal Chemical Industry, without the discharge of waste gas, waste liquid, therefore, belongs to the industry of greening and environmental protection.Adopt technical scheme of the present invention, tool of the present invention has the following advantages:
1, technical scheme technique of the present invention is simple, and operating safety, invests little.
2, the method for contriver is very simple and easy with low cost.
3, required in the inventive method water is mainly derived from the Water Sproading in raw coal and the water in waste liquid, fully saves water resources.
4, after the de-sodium coal that purifying vessel exports passes through drying and upgrading, become high-quality Filter Tuber For Clean Coal and directly applied to as Coal Chemical Industry, burning coal powder generating set.Thus the alkali-metal etching problem significantly improving or fundamentally solve the combustion slagging that faces of high sodium coal power generation unit and heating surface contamination problems and improve boiler body; Solve the sodium vapor separation problem in Coal Chemical Industry gasification simultaneously.
5, the liquid after the separation of coal liquid enters wastewater treatment equipment, and isolated sodium potassium concentrated solution is recyclable to be produced for alkaline and potash fertilizer.
6, this patent carries out flue gas upgrading process to the coal after purification, and the moisture content removed in coal makes the quality of coal greatly improve.
7, this patent is for purify under certain temperature and pressure coal, coal can remove equally in scavenging process sodium in coal, ash, mercury, sulphur, etc. element.
8, this patent is coal purification techniques, can use with complete sets of Techniques such as coal drying, Water Sproading circulating technology, upgrading, wastewater treatments.
In sum, the present invention has that technique is simple, operating safety, investment are little, the advantage of environmental protection.Both may be used for the supply of high-quality Filter Tuber For Clean Coal, and may be used for again firing high sodium coalpit mouth generating set, also realize joint production of coal and electricity.
Embodiment
Embodiment 1
The high sodium coal intermittent type of the present embodiment takes off sodium purifying method, and its step is as follows:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution is long-pending 3 times of high sodium coal body; Hydrochloric acid containing mass percent 8% in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add hot water, and the temperature of the purifying vessel making this airtight rises to 200 DEG C and pressure rises to 4Mpa;
S4, then stablize 2 minutes after be cooled to 50 DEG C, be depressurized to 0.1Mpa;
S5, after 3 minutes, will be warming up to 200 DEG C again, boosting is strong to 4Mpa;
S6, repetition above-mentioned steps S4 and S5 totally 5 times;
S7, last, the coal after purification is implemented coal liquid and be separated and carry out drying treatment to the coal after purification.
After testing, the decreasing ratio of the sodium in high sodium coal reaches 92%.
Embodiment 2
The high sodium coal intermittent type of the present embodiment takes off sodium purifying method, and its step is as follows:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution is long-pending 5 times of high sodium coal body; Acetic acid containing mass percent 15% in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add steam, rise to 350 DEG C with the temperature of the purifying vessel making this airtight and pressure rises to 5Mpa;
S4, then stablize 3 minutes after be cooled to 60 DEG C, be depressurized to 0.1Mpa;
S5, after 5 minutes, will be warming up to 350 DEG C again, boosting is strong to 5Mpa;
S6, repetition above-mentioned steps S4 and S5 totally 8 times.
S7, last, the coal after purification is implemented coal liquid and be separated and carry out drying treatment to the coal after purification.
After testing, the decreasing ratio of the sodium in high sodium coal reaches 91%.
Embodiment 3
The high sodium coal intermittent type of the present embodiment takes off sodium purifying method, and its step is as follows:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution is long-pending 5 times of high sodium coal body; Hydrochloric acid containing mass percent 10% in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add steam, rise to 150 DEG C with the temperature of the purifying vessel making this airtight and pressure rises to 3Mpa;
S4, then stablize 2 minutes after be cooled to 30 DEG C, be depressurized to 0.5Mpa;
S5, after 5 minutes, will be warming up to 150 DEG C again, boosting is strong to 3Mpa;
S6, repetition above-mentioned steps S4 and S5 totally 6 times.
S7, last, the coal after purification is implemented coal liquid and be separated and carry out drying treatment to the coal after purification.
After testing, the decreasing ratio of the sodium in high sodium coal reaches 91%.
Embodiment 4
The high sodium coal intermittent type of the present embodiment takes off sodium purifying method, and its step is as follows:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution is long-pending 5 times of high sodium coal body; Hydrochloric acid containing mass percent 15% in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add steam, rise to 350 DEG C with the temperature of the purifying vessel making this airtight and pressure rises to 5Mpa;
S4, then stablize 3 minutes after be cooled to 30 DEG C, be depressurized to 0.1Mpa;
S5, after 5 minutes, will be warming up to 350 DEG C again, boosting is strong to 5Mpa;
S6, repetition above-mentioned steps S4 and S5 totally 6 times.
S7, last, the coal after purification is implemented coal liquid and be separated and carry out drying treatment to the coal after purification.
After testing, the decreasing ratio of the sodium in high sodium coal reaches 96%.
By foregoing detailed description, can find out that the present invention has that technique is simple, operating safety, investment are little, the advantage of environmental protection, both may be used for the supply of high-quality Filter Tuber For Clean Coal, and may be used for again firing high sodium coalpit mouth generating set, also realize joint production of coal and electricity.
Claims (6)
1. high sodium coal intermittent type takes off a sodium purifying method, it is characterized in that, comprises the steps:
S1, be that 3-30mm height sodium coal raw coal and Aqueous wash solution load purifying vessel simultaneously by diameter, in described purifying vessel, the volume of Aqueous wash solution be the long-pending 3-5 of high sodium coal body doubly; Containing acetic acid or hydrochloric acid in described Aqueous wash solution;
S2, by airtight for this purifying vessel;
S3, in this airtight purifying vessel, add hot water or steam, and the temperature of the purifying vessel making this airtight rises to 150-350 DEG C and pressure rises to 3-5.0Mpa;
S4, then stablize 2-3 minute after be cooled to 30-60 DEG C, be depressurized to 0.1-1Mpa;
S5, after 3-5 minute, will be warming up to 150-350 DEG C again, boosting is strong to 3-5.0Mpa;
S6, repetition above-mentioned steps S4 and S5 5-8 time altogether.
2. high sodium coal intermittent type according to claim 1 takes off sodium purifying method, it is characterized in that: the mass percentage content that described acetic acid or hydrochloric acid account for Aqueous wash solution is 8-15%.
3. high sodium coal intermittent type according to claim 1 takes off sodium purifying method, it is characterized in that: the coal after purification is implemented coal liquid and is separated.
4. high sodium coal intermittent type according to claim 3 takes off sodium purifying method, it is characterized in that: carry out drying treatment to the coal after purification.
5. high sodium coal intermittent type according to claim 3 takes off sodium purifying method, it is characterized in that: the waste liquid water treatment device process obtained after being separated by coal liquid.
6. high sodium coal intermittent type according to claim 5 takes off sodium purifying method, it is characterized in that: coal liquid is separated the waste liquid after process and enters above-mentioned steps S1, recycle.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103540381A (en) * | 2013-09-29 | 2014-01-29 | 上海理工大学 | Method for removing sodium in Sinkiang high-sodium coal |
| CN104178237B (en) * | 2014-08-13 | 2016-08-31 | 华电电力科学研究院 | A kind of water static pressure is utilized to realize the method that sodium element in coal leaches and removes |
| CN104178239A (en) * | 2014-09-01 | 2014-12-03 | 华电电力科学研究院 | Method for enhancing quality of high-sodium coal by removing sodium through hydrothermal treatment |
| CN104371788A (en) * | 2014-11-26 | 2015-02-25 | 上海理工大学 | Method for removing sodium in high-sodium coal |
| CN105838473A (en) * | 2016-06-02 | 2016-08-10 | 华中科技大学 | Double-stage reaction integrated device and double-stage reaction integrated method for improving quality of high-alkalinity coal and catalytically gasifying waste liquid |
| CN113426568B (en) * | 2021-07-02 | 2022-12-09 | 中国矿业大学 | High-sodium low-rank coal flotation sodium removal method and system |
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| CN102533383A (en) * | 2012-02-23 | 2012-07-04 | 上海机易电站设备有限公司 | Sodium-removing purification cyclic system of high-sodium coal |
| CN102660347A (en) * | 2012-05-08 | 2012-09-12 | 中国五环工程有限公司 | Process for removing sodium in high-sodium coal and system thereof |
| CN202465627U (en) * | 2012-01-31 | 2012-10-03 | 上海机易电站设备有限公司 | High-sodium coal ash washing and sodium removing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202465627U (en) * | 2012-01-31 | 2012-10-03 | 上海机易电站设备有限公司 | High-sodium coal ash washing and sodium removing system |
| CN102533383A (en) * | 2012-02-23 | 2012-07-04 | 上海机易电站设备有限公司 | Sodium-removing purification cyclic system of high-sodium coal |
| CN102660347A (en) * | 2012-05-08 | 2012-09-12 | 中国五环工程有限公司 | Process for removing sodium in high-sodium coal and system thereof |
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