CN103421576A - Method for processing high-sodium coal - Google Patents
Method for processing high-sodium coal Download PDFInfo
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- CN103421576A CN103421576A CN2012105079114A CN201210507911A CN103421576A CN 103421576 A CN103421576 A CN 103421576A CN 2012105079114 A CN2012105079114 A CN 2012105079114A CN 201210507911 A CN201210507911 A CN 201210507911A CN 103421576 A CN103421576 A CN 103421576A
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Abstract
The invention provides a method for processing high-sodium coal, and can solve the problem that active sodium-bearing components in high-sodium coal take adverse effects on a boiler and other equipment. The method comprises the following steps: 1, pretreatment: uniformly spraying a certain amount of an aluminium hydroxide colloidal solution containing aluminium hydroxide and a silica sol solution containing silica on the high-sodium coal, or soaking the high-sodium coal in the aluminium hydroxide colloidal solution and the silica sol solution for a period of time to achieve pretreatment and obtain high-sodium coal; 2, drying: drying the high-sodium coal to obtain the dried high-sodium coal; 3, feeding the dried high-sodium coal into a high-temperature environment to be utilized, wherein in the process, aluminium oxide and silicon dioxide which are generated by decomposition of aluminium hydroxide react with the active sodium-bearing components to produce a less volatile sodium-bearing substance with high melting point.
Description
Technical field
The present invention relates to a kind ofly in order to improve in high sodium coal containing the sodium component, the equipment such as boiler be caused the method for the high sodium coal of dysgenic processing in hot environment.
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.
Silicon sol also claims silicic acid sol, is the dispersion liquid of nanometer grade silica particle in water or other solution, and wherein the concentration range of silicon-dioxide is 1～90%.Silicon sol is a kind of irreversible colloid, after being condensed into gel, can not be again with heating or adding the method for solvent to make it again to become colloidal sol, and the factor that affects silicon sol stability is a lot, as ionogen, temperature, pH value, concentration and size of particles etc.Silicon sol low price and of many uses, can be used as various fire bonds, catalyzer manufacture and support of the catalyst etc., and it has the advantages such as micelle is superfine, viscosity is low.
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 the processes such as dry and burning 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, the equipment such as boiler to be caused the method for the high sodium coal of dysgenic processing in hot environment, it is characterized in that, comprises the following steps:
Step 1, pre-treatment, described high sodium coal is evenly sprayed a certain amount of aluminium hydroxide gel liquid solution that contains aluminium hydroxide and the silicon sol solution that contains silicon-dioxide or described high sodium coal is immersed in to for some time in described aluminium hydroxide gel liquid solution and silicon sol 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 silicon-dioxide and described activity containing sodium the component high and not volatile sodium-containing material of generation fusing point that reacts.
Further, a kind of method of processing high sodium coal 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 method of processing high sodium coal provided by the invention can also have such feature: the silicon sol solution of using in step 1 is not contain the aluminium hydroxide gel liquid solution of sodium and/or potassium element for silicon sol solution, the aluminium hydroxide gel liquid solution that does not contain sodium and/or potassium element.
Further, a kind of method of processing high sodium coal provided by the invention can also have such feature: wherein, the consumption of silicon sol is determined with the silicon-dioxide of one to two mole and 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 method of processing high sodium coal that the application of the invention provides, high sodium coal is sprayed to aluminium hydroxide gel liquid solution and two kinds of solution of silicon sol solution, or high sodium coal is immersed in to certain hour in aluminium hydroxide gel liquid solution and two kinds of solution of silicon sol solution, because aluminium hydroxide gel liquid solution and silicon sol solution have 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 and silicon-dioxide reside in coal particle internal void and surface, the aluminum oxide that aluminium hydroxide decompose to generate under hot environment and the activity in silicon-dioxide and coal contain the sodium component very first time generation water glass that reacts, the fusing points such as sodium silicoaluminate 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, not only greatly reduced the content of the gas phase sodium in the flue gas, improved the ash fusion point of high sodium coal, and due to the flying dust mesosilicic acid salt generated, silico-aluminate composition height has further reduced flying dust viscosity, reduced ash deposition propensity, alleviated that high sodium coal utilizes the dust stratification that causes under hot environment and to the corrosion of the equipment such as boiler, therefore, improved in high sodium coal and under hot environment, 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
The method of the high sodium coal of the processing of using in the present embodiment, comprise the steps: two kinds of solution of silicon sol solution that aluminium hydroxide gel liquid solution that even spray concentration is 1 ~ 90% and concentration are 1 ~ 90% on high sodium coal or high sodium coal is immersed in two kinds of solution of silicon sol solution that 1 ~ 90% aluminium hydroxide gel liquid solution and concentration are 1 ~ 90% to 1 ~ 120 minute, guarantee that two kinds of colloidal particles fully are 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 aluminium hydroxide gel liquid solution and silicon sol solution processing adopts warm air drying to reduce its moisture, make and bring excessive moisture in high sodium coal into by aluminium hydroxide gel liquid solution and silicon sol solution and be dried and take away, and the aluminium hydroxide in solution and silicon-dioxide still reside in coal particle internal void and surface, in the process of burning, alumine hydroxide colloid particle in aluminium hydroxide solution decomposes the silicon-dioxide that contains in the aluminum oxide that generates and silicon sol solution and first with in coal containing the sodium component, a series of water glass that the generation fusing point is high, the sodium silicoaluminate etc. of reacting occur in combustion processes.
Wherein, do not contain the basic metal such as sodium, potassium in silicon sol solution used or the alkali metal contents such as sodium, potassium are extremely low, do not contain the basic metal such as sodium, potassium in the aluminium hydroxide gel liquid solution or the alkali metal contents such as sodium, potassium extremely low, can weaken effect of the present invention if contain sodium in solution.Colloidal particle in silicon sol solution and 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 two kinds of colloidal solution can be easy to penetrate in the internal void of coal.
Aluminium hydroxide gel liquid solution and silicon sol solution consumption should be determined containing the content of sodium component according to concentration and the activity in high sodium coal of silicon-dioxide in the concentration of the aluminium hydroxide in the aluminium hydroxide gel liquid solution, silicon sol 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 silicon-dioxide in the content of the aluminium hydroxide in known aluminium hydroxide gel liquid solution, silicon sol solution, higher containing sodium salt NaAlSiO by fusing point in resultant
4Atom trim (corresponding 1 the aluminium atom of 1 sodium atom and 1 Siliciumatom) just can determine the consumption of aluminium hydroxide gel liquid solution and silicon sol solution, the activity that is every mole is used the silicon-dioxide of one mole and the aluminium hydroxide of one mole containing the sodium component, but consider the adequacy of reaction, so need to be to aluminium hydroxide gel liquid solution and remaining of silicon sol solution consumption, so the activity of every mole is used the silicon-dioxide of one to two mole and 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, a kind of method of processing high sodium coal that the present embodiment provides, use has good infiltrative aluminium hydroxide gel liquid solution and two kinds of solution of silicon sol solution are processed high sodium coal, the silicon-dioxide that makes aluminium hydroxide in the aluminium hydroxide gel liquid solution and silicon sol solution both with contacting fully containing the sodium component in coal, active high containing the sodium component very first time generation fusing point that reacts in the aluminum oxide that aluminium hydroxide decompose to generate under the boiler high temperature environment and silicon-dioxide and coal, not volatile sodium-containing material, greatly improved reaction efficiency, and 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. a method of processing high sodium coal, in order to improve the active detrimentally affect under 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, described high sodium coal is evenly sprayed a certain amount of aluminium hydroxide gel liquid solution that contains aluminium hydroxide and the silicon sol solution that contains silicon-dioxide or described high sodium coal is immersed in to for some time in described aluminium hydroxide gel liquid solution and silicon sol 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 silicon-dioxide and described activity containing sodium the component high and not volatile sodium-containing material of generation fusing point that reacts.
2. a kind of method of processing high sodium coal according to claim 1 is characterized in that:
Wherein, described drying treatment is that hot blast is processed.
3. a kind of method of processing high sodium coal according to claim 1 is characterized in that:
Wherein, described silicon sol solution is that silicon sol solution, the aluminium hydroxide gel liquid solution that does not contain sodium and/or potassium element is not contain the aluminium hydroxide gel liquid solution of sodium and/or potassium element.
4. a kind of method of processing high sodium coal according to claim 1 is characterized in that:
Wherein, the consumption of described silicon sol is used the silicon-dioxide of one to two mole and 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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| CN2012105079114A CN103421576A (en) | 2012-11-30 | 2012-11-30 | Method for processing high-sodium coal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106433845A (en) * | 2016-11-21 | 2017-02-22 | 上海浦东路桥建设股份有限公司 | Potassium fixing method for biomass fuels |
| CN106987298A (en) * | 2017-04-21 | 2017-07-28 | 常州思宇环保材料科技有限公司 | A kind of preparation method of environmental protection coal-fired boiler coke-removing agent |
| CN107062277A (en) * | 2017-02-15 | 2017-08-18 | 上海浦东路桥建设股份有限公司 | Improve method and medicament that biomass boiler stains corrosion |
| CN108359512A (en) * | 2018-04-02 | 2018-08-03 | 国网新疆电力有限公司电力科学研究院 | Alleviate the additive and preparation and application of the quasi- high-alkali coal coking property in east in Xinjiang |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2012
- 2012-11-30 CN CN2012105079114A patent/CN103421576A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106433845A (en) * | 2016-11-21 | 2017-02-22 | 上海浦东路桥建设股份有限公司 | Potassium fixing method for biomass fuels |
| CN107062277A (en) * | 2017-02-15 | 2017-08-18 | 上海浦东路桥建设股份有限公司 | Improve method and medicament that biomass boiler stains corrosion |
| CN106987298A (en) * | 2017-04-21 | 2017-07-28 | 常州思宇环保材料科技有限公司 | A kind of preparation method of environmental protection coal-fired boiler coke-removing agent |
| CN108359512A (en) * | 2018-04-02 | 2018-08-03 | 国网新疆电力有限公司电力科学研究院 | Alleviate the additive and preparation and application of the quasi- high-alkali coal coking property in east in Xinjiang |
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Application publication date: 20131204 |