CN103421577A - Quality improving method for high-sodium coal - Google Patents
Quality improving method for high-sodium coal Download PDFInfo
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- CN103421577A CN103421577A CN2012105079307A CN201210507930A CN103421577A CN 103421577 A CN103421577 A CN 103421577A CN 2012105079307 A CN2012105079307 A CN 2012105079307A CN 201210507930 A CN201210507930 A CN 201210507930A CN 103421577 A CN103421577 A CN 103421577A
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Abstract
The invention provides a quality improving method for high-sodium coal, which can reduce the adverse effect of active sodium-contained constituent in the high-sodium coal on equipment such as a boiler in a high-temperature environment. The quality improving method comprises the following steps: step 1, pretreating: uniformly spraying a certain quantity of an aluminium hydroxide colloidal solution containing aluminium hydroxide on the high-sodium coal or soaking the high-sodium coal in the aluminium hydroxide colloidal solution for a certain time during the storage of the high-sodium coal; step 2, drying: drying the pretreated high-sodium coal to obtain dried high-sodium coal; step 3, sending the dried high-sodium coal into a high-temperature environment for utilization, wherein during the process, the aluminium oxide obtained through the decomposition of aluminium hydroxide reacts with the active sodium-contained constituent to generate a sodium-contained substance of which the melting point is high and the volatility is low.
Description
Technical field
The present invention relates to a kind ofly in order to improve in high sodium coal containing the sodium component, in hot environment, the equipment such as boiler be caused to dysgenic high sodium coal method for upgrading.
Background technology
China is the country of a rich coal resources, and coal is the main energy sources of China, accounts for more than 70% of energy consumption structure ratio.And, at the petroleum resources reserves, day by day reducing, new energy development is left to be desired under the prerequisite improved, and the advantage of coal resources is day by day obvious.
High sodium coal refers in coal and contains the high coal of sodium component concentration, on China, Australia, the U.S., Germany and other places, certain reserves arranged.Accurate east, Xinjiang is the very zones of enrichment of coal resources reserves, and prognostic reserves reach 3,900 hundred million tons, and adding up at present to verify the coal resources reserves is 2,136 hundred million tons, and 1.4 ten thousand square kilometres of coalfield coal-forming areas are China self-contained coalfields of maximum at present.With the present coal annual production of China, calculate, an eastern coalfield of standard just can be used 100 years in the whole nation.
The accurate eastern coal reserves in Xinjiang is huge, and cost of winning is low, and the coal reactivity is good, easily after-flame.But, because coal-forming is historical and local special physical geographic environment, contain the content (in ash content, as follows) of sodium component in accurate eastern coal totally all more than 2%, far above other regional steam coals (sodium oxide (Na in the China steam coal
2O) content is all below 1%), some mining areas producing coal, even up to more than 10%, because the content containing the sodium component in these coals is high, therefore is called these coals high sodium coal usually.
Refer to the summation of all sodium in coal in coal containing the sodium component, in coal, containing the sodium component, comprise low melting point, volatile containing sodium component and high-melting-point, not volatile containing the sodium component.Here low melting point, the volatile sodium component that contains are classified as to the active sodium component that contains, wherein, contain water-soluble sodium soluble in water active containing in the sodium component.
At high temperature the equipment of high sodium coal utilization mainly contained to boiler, vapourizing furnace etc., high sodium coal containing the activity contained in the sodium component, containing the sodium component, be to cause the major cause of the melting point depression of coal ash, in the high temperature environment such as burning or gasification, the coal ash of the low melting point ash that very easily (under hot environment) is melting with the slag particle of liquid state or semi liquid state is bonded on heating surface or on furnace wall, form one deck ash bed closely, cause the equipment slagging scorification such as boiler; These active sodium components that contain can be condensed on the equipment heat-transfer surface tube walls such as boiler, and react with sulfurous gas in flue gas, sulphur trioxide etc. the materials such as sodium sulfate that generate and form closely knit tack coat, this adhesive linkage reacts and causes high temperature corrosion with metal pipe-wall on the one hand, and the ash particle that can catch on the other hand in flue gas causes the high temperature bond dust stratification; Therefore, actively in high sodium coal containing the sodium component, can cause flying dust viscosity high, easily be caught by closely knit contamination tack coat, thus on heat-transfer surface the formation of deposits dust stratification, be the major cause that causes heat-transfer surface contamination, slagging scorification and dust stratification.Just because of equipment such as boilers, in hot environment, utilize high sodium coal can cause the problems such as heat-transfer surface contamination, slagging scorification and dust stratification, cause in hot environment utilizing the equipment such as boiler of high sodium coal to have to change heat-transfer surface after the short period of time operation, cause serious financial loss, not only affect the safety and economic operation of the equipment such as boiler, and seriously limited the utilization to high sodium coal.
At present for the control techniques of the problems referred to above mainly contain the equipment such as boiler appropriate design and operation, mix and burn high-quality and hang down sodium coal and additive etc.But, due to not enough to high sodium coal combustion research, the design of the equipment such as the high sodium coal burning boiler that burns does not obtain important breakthrough.Add the silicon-dioxide such as kaolin, additive that alumina content is high in high sodium coal combustion process, sodium in additive and gas phase is reacted, can alleviate contamination, but the additive that this method is used is solid, exist efficiency low, greatly increase the shortcoming such as ash load, therefore do not obtain large-scale application yet.
Under hot environment, utilize high sodium coal easily to cause contamination, slagging scorification and dust stratification problem, the current control techniques about the contamination of high sodium coal, slagging scorification and dust stratification is Shortcomings still.
The aluminium hydroxide gel liquid solution is the dispersion liquid of nano level aluminium hydroxide in water or other solution, and wherein the concentration range of alumine hydroxide colloid particle is 1～90%.Adopt dispersion agent can hinder the alumine hydroxide colloid particle aggregation, and guarantee that in dry and combustion processes the alumina particle size distribution is even, the normal dispersion agent adopted is polyoxyethylene glycol.
Summary of the invention
For many defects of prior art, the present invention proposes a kind ofly in order to improve in high sodium coal containing the sodium component, in hot environment, the equipment such as boiler to be caused to dysgenic high sodium coal method for upgrading, it is characterized in that, comprises the following steps:
Step 1, pre-treatment, in described high sodium coal storage process, described high sodium coal is evenly sprayed a certain amount of aluminium hydroxide gel liquid solution that contains aluminium hydroxide or described high sodium coal is immersed in to for some time in described aluminium hydroxide gel liquid solution, obtain pre-treatment and complete high sodium coal;
Step 2, drying treatment, complete high sodium coal to described pre-treatment and carry out drying treatment, obtains drying and complete high sodium coal;
Step 3, complete high sodium coal by described drying and send in hot environment and utilize, and in this process, described aluminium hydroxide decomposes the aluminum oxide that generates and described activity containing sodium the component high and not volatile sodium-containing material of generation fusing point that reacts.
Further, a kind of high sodium coal method for upgrading provided by the invention can also have such feature: the drying treatment in step 2 is that hot blast is processed.
Further, a kind of high sodium coal method for upgrading provided by the invention can also have such feature: wherein, the aluminium hydroxide gel liquid solution of using in step 1 is not for containing the aluminium hydroxide gel liquid solution of sodium and/or potassium element.
Further, a kind of high sodium coal method for upgrading provided by the invention can also have such feature: wherein, the consumption of aluminium hydroxide gel liquid solution is determined with the aluminium hydroxide of one to two mole containing the sodium component according to the activity of every mole.
Invention effect and effect
A kind of high sodium coal method for upgrading that the application of the invention provides, in high sodium coal storage process, high sodium coal is sprayed to the aluminium hydroxide gel liquid solution, or high sodium coal is immersed in to certain hour in the aluminium hydroxide gel liquid solution, because the aluminium hydroxide gel liquid solution has good perviousness, its perviousness is close to water.Therefore, can be penetrated into coal particle inside by the coal surface, with contacting fully containing the sodium component in coal, aluminium hydroxide resides in coal particle internal void and surface, and the aluminum oxide decompose generated in the boiler combustion hot environment and the activity in coal contain the sodium component very first time generation sodium metaaluminate that reacts, the fusing points such as sodium aluminium silicate are high, not volatile sodium-containing material, greatly improved reaction efficiency, and this sodium-containing material can reside in lime-ash and be caught by follow-up dust removal installation, greatly reduced the content of the gas phase sodium in the flue gas, and aluminum oxide plays " skeleton " effect when the coal ash melting, therefore, improved the ash fusion point of high sodium coal, and due to meta-aluminate in the flying dust generated, the composition height such as aluminosilicate have further reduced flying dust viscosity, reduced ash deposition propensity, alleviated dust stratification that high sodium coal combustion causes and to the corrosion of equipment, therefore, improved in high sodium coal and in combustion processes, the equipment such as boiler have been caused to detrimentally affect containing the sodium component.
Embodiment
Below in conjunction with embodiment, the invention will be further described.It should be understood that the present embodiment only is not used in and limits the scope of the invention for the present invention is described.
Embodiment
A kind of high sodium coal method for upgrading that improves high sodium coal combustion: the aluminium hydroxide gel liquid solution that evenly spray concentration is 1～90% is immersed in 1～90% aluminium hydroxide gel liquid solution 1～120 minute on high sodium coal or by high sodium coal, guarantee that the alumine hydroxide colloid particle fully is penetrated into coal particle hole inside by the coal surface, wherein, in sprinkling and immersion process, the water-soluble sodium of part in can the high sodium coal of eccysis, the active release containing the sodium component while reducing the high sodium coal of boiler combustion; Because the direct high coal of burning water content can cause occurring the problems such as boiler operatiopn is unstable, so the high sodium coal after the alumine hydroxide colloid solution-treated adopts warm air drying to reduce its moisture, make and bring excessive moisture in high sodium coal into by the aluminium hydroxide gel liquid solution and be dried and take away, and the aluminium hydroxide micelle in solution still resides in coal particle internal void and surface; In the process of burning, the alumine hydroxide colloid particle contained in the aluminium hydroxide gel liquid solution added decomposes the aluminum oxide that generates and containing the sodium component, a series of the reaction occurs in coal and generate the sodium salt etc. that sodium metaaluminate that fusing point is high, sodium aluminium silicate etc. contain aluminium in combustion processes, has reduced the contamination media such as sodium sulfate and sodium-chlor.
Wherein, do not contain the basic metal such as sodium, potassium or the alkali metal contents such as sodium, potassium in aluminium hydroxide gel liquid solution used extremely low, if contain sodium in the aluminium hydroxide gel liquid solution, can weaken effect of the present invention.Colloidal particle in the aluminium hydroxide gel liquid solution superfine (1～1000nm), and be evenly distributed in solution, good perviousness therefore there is.Hole in coal is divided into macropore (>50nm), mesopore (2.0～50nm) and micropore (<2.0nm), so the colloidal particle in the aluminium hydroxide gel liquid solution can be easy to penetrate in the internal void of coal.
The alumine hydroxide colloid solution usage should be determined containing the content of sodium component according to concentration and the activity in high sodium coal of aluminium hydroxide in the aluminium hydroxide gel liquid solution.Take the high sodium coal of 2g, add 15mL 1mol/L hydrochloric acid, 20h in the water bath with thermostatic control of 60 ℃, filter afterwards.After high sodium coal drying after filtration, heating 3 hours under 600 ℃ of constant temperature, carry out HNO to the coal ash obtained
3-HCl-HF clears up, and adopts afterwards atomic spectrophotometer the digestion solution of filtrate and coal ash to be carried out to the mensuration of sodium content.Can obtain the active content containing the sodium component to filtrate mensuration, and can obtain being insoluble in high sodium coal the sodium content (this part sodium exists mainly with the form of sodium silicoaluminate) of dilute hydrochloric acid to the mensuration of coal ash digestion solution, both additions just can obtain the content of high sodium coal containing the sodium component.The content of alumine hydroxide colloid particle in known aluminium hydroxide gel liquid solution, then by resultant NaAlO
2, NaAlSiO
4Atom trim (1 aluminium hydroxide molecule corresponding 1 sodium atom) just can determine the consumption of aluminium hydroxide gel liquid solution, the activity that is every mole is used the alumine hydroxide colloid particle of a mole containing the sodium component, but consider the adequacy of reaction, so need to be to remaining of alumine hydroxide colloid solution usage, so the activity of every mole is used the aluminium hydroxide of one to two mole containing the sodium component.
High sodium coal after untreated and processing is carried out respectively to the coal ash test, and the ash fusion point of the high sodium coal after result shows to process obviously improves.
High sodium coal after untreated and processing is carried out respectively to combustion characteristic research, and the sodium content in the gas-phase product of the high sodium coal after result shows to process reduces, and lime-ash is carried out to composition test, shows that the sodium content in lime-ash increases.
After high sodium coal after showing to process by the present invention by the test of the fouling characteristics after burning reacts in combustion processes, improved ash fusion point on the one hand, reduced the viscosity of flying dust, thereby reduced slagging scorification and the fouling potential of high sodium coal; Reduced on the other hand and caused that sodium sulfate that the boiler heat exchange face stains and sodium-chlor etc. stain medium.So, high sodium coal combustion causes contamination, slagging scorification and dust stratification problem are controlled preferably.
Embodiment effect and effect
In sum, the high sodium coal method for upgrading that the present embodiment provides, use has good infiltrative aluminium hydroxide gel liquid solution high sodium coal is processed, make the alumine hydroxide colloid particle of aluminium hydroxide gel liquid solution and contacting fully containing the sodium component in coal, and resolve in the boiler combustion hot environment in aluminum oxide and coal and actively to react containing the sodium component very first time that to generate fusing point high, not volatile sodium-containing material, greatly improved reaction efficiency, and aluminum oxide can play " skeleton " effect when the coal ash melting, improved on the one hand ash fusion point, reduced the viscosity of flying dust, thereby slagging scorification and the fouling potential of high sodium coal have been reduced, also reduced on the other hand and caused that sodium sulfate that the boiler heat exchange face stains and sodium-chlor etc. stain medium, thereby improved efficiently contamination, slagging scorification and the dust stratification problem that high sodium coal combustion causes.
Claims (4)
1. one kind high sodium coal method for upgrading, in order to improve the active detrimentally affect in hot environment, the equipment such as boiler caused containing the sodium component in high sodium coal, is characterized in that, comprises the following steps:
Step 1, pre-treatment, evenly spray a certain amount of aluminium hydroxide gel liquid solution that contains aluminium hydroxide or described high sodium coal be immersed in to for some time in described aluminium hydroxide gel liquid solution described high sodium coal, obtains pre-treatment and complete high sodium coal;
Step 2, drying treatment, complete high sodium coal to described pre-treatment and carry out drying treatment, obtains drying and complete high sodium coal;
Step 3, complete high sodium coal by described drying and send in hot environment and utilize, and in this process, described aluminium hydroxide decomposes the aluminum oxide that generates and described activity containing sodium the component high and not volatile sodium-containing material of generation fusing point that reacts.
2. a kind of high sodium coal method for upgrading according to claim 1 is characterized in that:
Wherein, described drying treatment is that hot blast is processed.
3. a kind of high sodium coal method for upgrading according to claim 1 is characterized in that:
Wherein, described aluminium hydroxide gel liquid solution is not contain the aluminium hydroxide gel liquid solution of sodium and/or potassium element.
4. a kind of high sodium coal method for upgrading according to claim 1 is characterized in that:
Wherein, the consumption of described aluminium hydroxide gel liquid solution is used the aluminium hydroxide of one to two mole to determine according to the activity of every mole containing the sodium component.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564905A (en) * | 2016-10-20 | 2017-04-19 | 成都新柯力化工科技有限公司 | Method for large-scale preparation of low-cost silicon dioxide composite aerogel |
| CN115948190A (en) * | 2022-10-26 | 2023-04-11 | 宁波众茂杭州湾热电有限公司 | Method and system for improving pore structure and combustion heat of fire coal |
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| US4268271A (en) * | 1979-11-26 | 1981-05-19 | Atlantic Richfield Company | Reduction of the fouling potential of high sodium coal |
| TW200305642A (en) * | 2001-03-23 | 2003-11-01 | Taiho Ind Co | Fuel-combusting method |
| CN101372640A (en) * | 2007-08-24 | 2009-02-25 | 北京金源化学集团有限公司 | Method for adding coal catalyst and additive |
| CN101747977A (en) * | 2008-12-11 | 2010-06-23 | 辽宁科技大学 | Desulfurization method for adding addition agent into coking coal |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4268271A (en) * | 1979-11-26 | 1981-05-19 | Atlantic Richfield Company | Reduction of the fouling potential of high sodium coal |
| TW200305642A (en) * | 2001-03-23 | 2003-11-01 | Taiho Ind Co | Fuel-combusting method |
| CN101372640A (en) * | 2007-08-24 | 2009-02-25 | 北京金源化学集团有限公司 | Method for adding coal catalyst and additive |
| CN101747977A (en) * | 2008-12-11 | 2010-06-23 | 辽宁科技大学 | Desulfurization method for adding addition agent into coking coal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564905A (en) * | 2016-10-20 | 2017-04-19 | 成都新柯力化工科技有限公司 | Method for large-scale preparation of low-cost silicon dioxide composite aerogel |
| CN115948190A (en) * | 2022-10-26 | 2023-04-11 | 宁波众茂杭州湾热电有限公司 | Method and system for improving pore structure and combustion heat of fire coal |
| CN115948190B (en) * | 2022-10-26 | 2024-01-26 | 宁波众茂杭州湾热电有限公司 | Method and system for improving pore structure and combustion heat of fire coal |
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Application publication date: 20131204 |