CN105038897A - High-sulphur coal desulfurization method - Google Patents
High-sulphur coal desulfurization method Download PDFInfo
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- CN105038897A CN105038897A CN201510451349.1A CN201510451349A CN105038897A CN 105038897 A CN105038897 A CN 105038897A CN 201510451349 A CN201510451349 A CN 201510451349A CN 105038897 A CN105038897 A CN 105038897A
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Abstract
The invention discloses a high-sulphur coal desulfurization method which comprises the following steps: pulverizing coal, mixing pulverized coal with catalysts, heating raw coal to 700-900 DEG C at the ammonia atmosphere and carrying out heat preservation, so as to realize the purpose of desulfurization, wherein the mass ratio of the composite catalyst NiS to the composite catalyst CoS is (4-2):1, and the mass ratio of the pulverized coal to the composite catalysts is (10000-100):1. According to the invention, under the condition of not consuming more heat, most of sulphur in the coal is removed, so that the sulphur content of the coal is reduced greatly, the quality is improved, environmental protection pressure of the carbon product industry which adopts coal as raw material is reduced greatly and a wide application prospect is realized.
Description
Technical field
The present invention relates to a kind of method of coal desulfurization, be applied to metallurgy, material, chemical industry and environmental technology field.
Background technology
Coal is that archaeophyte is imbedded in underground and experienced by the solid combustible mineral that complicated biological chemistry and physicochemical change formed gradually.CHINESE COAL reserves are huge, are domestic first energy sources at present.But the coal sulphur content of domestic product differs, comparatively large from 0.2wt.%-9wt.% rangeability, the coal wherein more than 30% is the high sulphur coal that sulphur content is greater than 3wt.%.And along with the excessive use of low sulphur coal and exhaustion day by day.How the high sulphur coal that utilizes of environmental protection becomes current problem demanding prompt solution.
The desulfurization of coal mainly adopts three kinds of forms: desulfurization before using, and uses middle desulfurization and desulfurization after using.Use middle desulfurization and use after desulfurization mainly for coal as processing form during fuel combustion.But along with scientific-technical progress, coal becomes increasingly conspicuous as the advantage of the high-quality carbon product raw material of cheapness, and increasing industry explores coal and carrys out the raw materials for production as carbon product such as petroleum replacing Jiao, natural graphite.But element sulphur endangers maximum element in carbon product, want to utilize high sulphur coal first coal will be carried out desulfurization process to it when feed stage to the carbon product manufacturing high-quality.
Sweetening agent disclosed in publication application CN104099153A is processed through science is composite according to certain ratio by extraordinary emulsifying agent, dispersion agent, clean-out system and complexing agent and permeate agent.According to coal burning reaction mechanism, complexing coal washing sweetening agent composition is added in coal washing sweetener, by effects such as oxidation, catalysis and metal ion exchanged, the objectionable impuritiess such as the inorganic sulfur in coal and organic sulfide are formed sulfide soluble in water by chemical reaction.
Be a kind of desulfurization before coal combustion agent and sulfur method disclosed in publication application CN104673428A, adopt solid-liquid mixed sweetening agent, it departs from the sulphur in coal before coal burning; The proportion of calcium phosphate is: 8%-12%, Wingdale 83%-90%, organic reagent, is ethanol in the present embodiment, and the weight ratio of ethanol is 15%-20%; The weight ratio of water is 10%-15%; The mol ratio of oxygen content and phosphorus is 4: 1-4.5: 1, and the volume ratio of nitrogen and oxygen is 1: 2.5-1: 3.
Publication application CN101831341A discloses a kind of sulfur method of cleaned coal of technical field of coal processing, carries out reduction and desulfurization by adding metal hydride after particle coal sample being mixed with liquid media.
Publication application CN104611087A discloses a kind of method of desulfurizing petrol coke.Method is identical, but for different with the object (coal, refinery coke) needing to protect.And coal is because different from refinery coke structure, one is mineral substance, and a kind of is the smelting by-product product of oil, is work in-process.Inside coal self structure, space is considerably less, different from the structure of refinery coke porous, and therefore coal does not have good effect in simple ammonia atmosphere desulfurization, must add catalyst activation.
Other close patent and above four kinds are illustrated similar, and the majority relating to ammonia desulfurization is desulfurization technology after the combustion adopting ammonia process sulfur-containing smoke gas, relates to being mostly in order to the application in burning of coal process of sweetening agent invention.
Summary of the invention
The object of the invention is the deficiency for high quality raw material carbon industry background in short supply and above-mentioned patent, provide a kind of by the method for high sulphur coal desulfurization.Desulfurization degree reaches as high as more than 70%.
Detailed process is as follows: first coal is broken into 1mm and following and be (4-2) with 0.1mm grade and following NiS and CoS mass ratio: the composite catalyst of 1 is with (10000-100): the mass ratio of 1 mixes, and then pass into ammonia, be warming up to 700-900 DEG C simultaneously and be incubated 30-120min desulfurization.
Further, wherein the broken particle diameter of coal is below 0.5mm.
Further, wherein the blending ratio of pre-coal dust and composite catalyst is (5000-1000): 1.
Further, described desulfurization temperature is 750-850 DEG C, and soaking time is 30-60min.
Further, when desulfurization passes into as ammonia, ammonia pressure is more than or equal to 0.101MPa.
Further, wherein in ammonia and coal, the reaction principle of sulphur content is roughly that ammonia can discharge reductibility hydrogen atom in temperature of reaction (700-1000 DEG C), and the sulphur part in coal is with thiophene-based, and thioether and sulphur sulfone are that main organosulfur form exists.In this reductibility hydrogen atom and coal, C-C key is compared and can be reacted by C-S key in preferential and Jiao.Be present in the inorganic sulfur in coal in addition with FeS, vitriol and sulphite form, also can deposit in case first reaction at active hydrogen and generate sulphur simple substance, regeneration hydrogen sulfide is discharged.Will be removed by ammonia gas react according to the most sulphur in above desulphurization mechanism coal.
The sulfide of the valence variation element such as nickel, cobalt can promote that the essence that in ammonia and coal, sulphur content reacts is under this variable valency metal and compound existent condition thereof, sulphur content is more prone to depart from from the organic compound such as thiophene, and the active hydrogen atom produced with ammonia reacts and generates H
2s and removing in coal.But in coal desulfurization, the catalytic effect of single-element is also bad, on the contrary, more than about 600 DEG C, under ammonia atmosphere, the sulfide of mixed Ni, cobalt element is studied discovery through us and finally can be formed one and can be expressed as CoNi
xs
x+1(x>1) complicated porous high surface area material, this material can present the effect of 1+1>2 to the coal desulfurization under ammonia atmosphere.Farthest change into this catalyzer reach with to optimum sweetening effectiveness to calcine under ammonia atmosphere in sweetening process, we determine (4-2) on a series of experiment basis: 1 this proportioning.
Outstanding feature of the present invention:
1 the present invention significantly can reduce the sulphur content in high sulphur coal at a lower temperature, and the sulphur in coal can be focused on, and namely alleviates the environmental protection pressure that charcoal element produces follow-up workshop section, the sulphur removed can be made sulfur-bearing chemical again.
2 the present invention effectively can improve the utilization ratio of high sulphur coal.The further raw material use range having expanded carbon industry.
Atmosphere (ammonia) wide material sources used in 3 the present invention, low price.
The metal sulfide catalyst addition used in 4 the present invention is few, low price.
5 the invention process techniques are simple and convenient, just sulphur can be removed in the normal calcination process of raw material.
Embodiment
Be described further below in conjunction with specific embodiment, but the present invention is not therefore subject to any restriction.
Embodiment 1
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, be crushed to below 0.5mm, be laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the NiS powder 0.0002g being less than 0.075mm granularity with the CoS powder 0.0001g being less than 0.075mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 120min.Finally take out coal and carry out survey sulphur, find that wherein sulphur content is down to 1.18wt.%, desulfurization degree is 75.4%.
With comparative example 1,2,3 compare, composite catalyst with independent element catalyst and do not add any catalyzer condition under effect all to get well.As shown in table 1 in addition, under the same conditions as example 1 change CoS and NiS proportioning by experiment and XRD detect after reach a conclusion, be (4-2) at NiS and CoS mass ratio: in the scope of 1, more easily form CoNi
xs
x+1compound, and reach higher sweetening effectiveness.After NiS and CoS mass ratio is more than 4, because the compound formation of the wherein Main Function of the catalyzer under equal in quality is less, effect is affected on the contrary.
Form
| NiS：CoS | Desulfurization degree (%) |
| 1：1 | 64.3 |
| 1.5：1 | 67.5 |
| 2：1 | 75.4 |
| 3：1 | 75.6 |
| 4：1 | 74.7 |
| 4.5：1 | 72.8 |
| 5：1 | 65.6 |
Comparative example 1
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, is crushed to below 0.5mm, is laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the CoS powder 0.0003g being less than 0.075mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 120min.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 63.6%.
Comparative example 2
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, is crushed to below 0.5mm, is laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the NiS powder 0.0003g being less than 0.075mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 120min.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 60.13%.
Comparative example 3
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, is crushed to below 0.5mm, is laid in the flat square porcelain boat of a 2 × 3cm.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere).Insulation 120min is carried out when being warming up to 800 DEG C.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 57.08%.
Embodiment 2
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, be crushed to below 0.5mm, be laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the NiS powder 0.0002g being less than 0.1mm granularity with the CoS powder 0.0001g being less than 0.1mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 60min.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 73.5%.
Embodiment 3
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, be crushed to below 0.5mm, be laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the NiS powder 0.002g being less than 0.075mm granularity with the CoS powder 0.001g being less than 0.075mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 120min.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 76.4%.
Embodiment 4
Get domestic certain high sulphur coal 3g, recording its sulphur content is 4.8wt.%, be crushed to below 0.5mm, be laid in the flat square porcelain boat of a 2 × 3cm after fully mixing with the NiS powder 0.02g being less than 0.075mm granularity with the CoS powder 0.01g being less than 0.075mm granularity.Then the porcelain boat containing coal charge is placed in stove, heats with the heating rate of 7 DEG C/Min, and pass into ammonia (in Reaktionsofen, ammonia pressure keeps 1 normal atmosphere), then at 800 DEG C of insulation 120min.Finally take out coal and carry out survey sulphur, find that its desulfurization degree is 80.5%.
Claims (5)
1. the method for a high sulphur coal desulfurization, it is characterized in that: first coal is broken into 1mm and following and be (4-2) with 0.1mm grade and following mass ratio: NiS and the CoS composite catalyst of 1 mixes, the mass ratio of coal dust and composite catalyst mass ratio is (10000-100): 1, and then pass into ammonia, be warming up to 700-900 DEG C simultaneously and be incubated 30-120min desulfurization.
2. the method for high sulphur coal desulfurization according to claim 1, is characterized in that: the broken particle diameter of coal is below 0.5mm.
3. the method for high sulphur coal desulfurization according to claim 1, is characterized in that: the blending ratio of pre-coal dust and composite catalyst is (5000-1000): 1.
4. the method for high sulphur coal desulfurization according to claim 1, is characterized in that: described desulfurization temperature is 750-850 DEG C, and soaking time is 30-60min.
5. the method for high sulphur coal desulfurization according to claim 1, is characterized in that: ammonia pressure is more than or equal to 0.101MPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105316073A (en) * | 2015-11-27 | 2016-02-10 | 榆林学院 | Coal desulfurization experiment device and desulfurization method |
| RU2812183C1 (en) * | 2022-10-18 | 2024-01-24 | Публичное Акционерное Общество "Новолипецкий металлургический комбинат" | Method for desulphurization of petroleum coke |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316073A (en) * | 2015-11-27 | 2016-02-10 | 榆林学院 | Coal desulfurization experiment device and desulfurization method |
| RU2812183C1 (en) * | 2022-10-18 | 2024-01-24 | Публичное Акционерное Общество "Новолипецкий металлургический комбинат" | Method for desulphurization of petroleum coke |
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Application publication date: 20151111 |