CN109609242B - Material preparation capable of changing structure of combustion product of eastern Junggar coal and method for combusting eastern Junggar coal in large proportion in power generation and heat supply boilers - Google Patents
Material preparation capable of changing structure of combustion product of eastern Junggar coal and method for combusting eastern Junggar coal in large proportion in power generation and heat supply boilers Download PDFInfo
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- CN109609242B CN109609242B CN201910039366.2A CN201910039366A CN109609242B CN 109609242 B CN109609242 B CN 109609242B CN 201910039366 A CN201910039366 A CN 201910039366A CN 109609242 B CN109609242 B CN 109609242B
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- 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
- C10L9/10—Treating solid fuels to improve their combustion by using additives
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- 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
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/04—Use of additives to fuels or fires for particular purposes for minimising corrosion or incrustation
Abstract
The invention provides a modulation material capable of changing the chemical structure of a combustion product of eastern Junggar coal, which comprises the following components: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from one or more of crude oil, heavy oil, residual oil and kerogen with a kerogen structure. The inorganic substance of the invention continuously decomposes and captures harmful elements of sodium and sulfur in the fuel in a temperature field of more than 700 ℃ to form alkali metal sulfate, which has the effects of fixing sodium and sulfur and reduces the contamination of heated surfaces and high-temperature corrosion; meanwhile, the decomposed gas makes the eutectic substance with low melting point porous, loose and capable of falling off. Organic matters in the prepared material are wrapped by a low-temperature eutectic substance formed after inorganic matters and/or eastern Junggar coal are combusted, so that a pyrolysis hysteresis phenomenon is generated, and after the eutectic substance is bonded to a heated surface, the heated surface at 500 ℃ is continuously heated, so that the organic matters are subjected to a thermal explosion effect, and the structure of the eutectic substance is loosened and falls off. The contamination problem is thoroughly solved.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a material preparation method capable of changing the structure of a combustion product of east China coal and a method for combusting east China coal in a large proportion in a power generation and heat supply boiler.
Background
The east of Xinjiang Changji Fukang City of West east of the coal field of the east, the old Jun Temple of Dong Juanzhou, the south of Kalam Maili mountain of the north border of the north of Changji, the south is connected with the north border of Guerbantong Gute desert, the east and west are about 220km, the south and north are about 60km, the area of the coal field is about 13000km2The predicted coal resource reserves are 3900 trillion t, and 17.8% of the full-ARUM reserves (2.19 trillion t) account for 7% of the national coal reserves (5.56 trillion t). 6 as of 2009The monthly proven coal resource reserves are 213 hundred million t, the maximum thickness of a single-layer coal seam can reach 80m, the average thickness of a coal seam which can be mined is 43m, and the thick part of the coal seam is 1km2The coal reserves reach 5000 ten thousand t, and the coal is the largest whole coal field in China and even in the world. In 2006, countries and municipalities began developing large-scale coal fields in the eastern kingdom. The predicted reserve of coal resources in the east China accounts for one third of the whole Xinjiang, the planned mining scale is 5.82 hundred million tons per year, and the method is a main position for dominant resource conversion and the most main energy base for east transportation of Jiang Electricity, east transportation of West gas and east transportation of Jiang coal.
The coal quality of the coal used as power coal has the fatal defects of high content of alkali metal elements, particularly sodium element, and Na in coal ash2The O reaches 2-10 percent, which far exceeds the level of less than 1 percent of the current domestic bituminous coal and even brown coal ash.
As the mineral components of the eastern Junggar coal are greatly different from those of all other domestic coal types, the coal-fired boilers which are already in service are completely not suitable for combustion, and the main reason is that the boilers in service are designed and manufactured according to the characteristics of other bituminous coal before the eastern Junggar coal is developed. More seriously, however, after the eastern Junggar coal is developed and utilized to generate electricity, the departments of electric power research, design and manufacture do not pay enough attention, and the original design thought is still used in a newly-built power plant using the eastern Junggar coal, so that the normal and safe operation cannot be realized during operation. For example, a critical boiler unit of a certain manufacturing enterprise is designed to have serious errors, which causes huge economic loss. Even if the width of a hearth is increased by subsequent boiler design, deposition and contamination of high-contamination fly ash on a convection heat exchange surface after the flue gas is cooled cannot be fundamentally avoided.
For many 2000-million kilowatt in-service unit boilers in Wuluqiqi areas, the annual consumption of standard coal is about 3000 million tons. The east Junggar coal can be burnt on the existing bituminous coal boiler only by being mixed with non-coking coal, the proportion cannot be too high and is not more than 30 percent generally, otherwise, water-cooled wall coking of a burner region of a hearth easily occurs, the smoke temperature of a hearth outlet of the boiler is increased, the heating surface of a horizontal flue is polluted at high temperature, the ash deposition is serious, and the boiler has to be stopped and coke cleaned even when the pipe passes through the pipe wall of a reheater and is over-temperature and pipe burst. The reed lake beam, the red goose pool, the second factory, the Wu petrochemical industry self-provided power plant, the Tian industry power plant, the Gansu wine steel power plant and the like all generate slag bonding and contamination to different degrees. After the 435t/h boiler of the wine steel power plant burns the east Junggar coal for 1-2 months, areas such as large screens, convection heating surfaces and the like are seriously corroded at high temperature, forced furnace shutdown is caused, power failure and heat supply stop are caused, the life of people is seriously influenced, particularly after accidental heating shutdown in winter, a heat supply pipeline is frozen and burst, and the life safety of people is endangered in cold winter without heating indoors.
The coal resources in the east China are rich, but the existing boiler combustion system can not realize the independent use of the coal, if the mixed combustion proportion is not higher than 50%, the power plant needs to transport at least 1 ton of other coal for burning 1 ton of east China, and the economic cost is higher. As an energy output area, the fuel still depends on outward transportation, is not in accordance with the local development mode, and is a huge waste of developed resources. Therefore, the realization of burning the large proportion of the eastern Junggar coal becomes a problem to be solved urgently.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a modulating material capable of changing the chemical structure of the combustion product of eastern Junggar coal, and the modulating material provided by the present invention can thoroughly solve the problems of slag bonding and contamination on the heating surface of the boiler.
The invention provides a modulation material capable of changing the chemical structure of a combustion product of eastern Junggar coal, which comprises the following components: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from one or more of crude oil, heavy oil, residual oil and kerogen with a kerogen structure.
Preferably, the synthetic inorganic substance comprises:
60-90 parts by weight of aluminum silicate;
5-40 parts by weight of alkaline earth aluminosilicate;
5 to 10 parts by weight of an alkaline earth metal carbonate.
Preferably, the alkali metal aluminosilicate comprises one or more of magnesium aluminosilicate, calcium aluminosilicate and calcium magnesium aluminosilicate; the alkali metal carbonate comprises one or more of calcium carbonate, magnesium carbonate and calcium magnesium carbonate.
Preferably, the natural inorganic matter comprises clay minerals and aluminosilicate minerals; the clay mineral comprises one or more of shale, kaolinite, illite, montmorillonite, vermiculite and sepiolite;
the clay minerals account for 80-100% of the natural inorganic matter by mass; the aluminosilicate minerals comprise one or more of sillimanite and mullite, and the aluminosilicate minerals account for 5-20% of natural inorganic substances by mass.
Preferably, the sulfur content in the heavy oil or residual oil is below 1%.
The invention provides the application of the prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal in a coal-fired power generation boiler and a heat supply boiler in any technical scheme; including, but not limited to, pulverized coal boilers, circulating fluidized bed boilers, and industrial boilers.
The invention provides a method for burning a large proportion of east Junggar coal in a coal-fired power generation and heat supply boiler, which comprises the following steps:
the prepared material which can change the chemical structure of the combustion product of the eastern Junggar coal and is prepared by any one of the technical schemes is mixed with the eastern Junggar coal and combusted.
Preferably, the proportion of the prepared material to the total mass percent of the combustion material in the furnace is more than 5%; the Si/Ca ratio in the mixed material of the prepared material and the east-west coal is more than 2.
Preferably, the method also comprises the step of periodically purging the easy-slagging boiler heating surface by a soot blower.
Preferably, the modulation material capable of changing the chemical structure of the combustion product of the eastern Junggar coal is crushed and then mixed with the eastern Junggar coal; or
The prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal is mixed with the eastern Junggar coal and then crushed.
Compared with the prior art, the invention provides a prepared material capable of changing the chemical structure of a combustion product of eastern Junggar coal, which comprises the following components: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from one or more of crude oil, heavy oil, residual oil and kerogen with a kerogen structure. The inorganic substance provided by the invention continuously decomposes and captures harmful element sulfur in fuel in a temperature field of more than 700 ℃ to form alkali metal sulfate, has a certain sulfur fixing effect, and reduces high-temperature corrosion of a heating surface; meanwhile, the decomposed gas makes the eutectic with low melting point porous and loose. Organic matters in the prepared material are wrapped by a low-temperature eutectic substance formed after inorganic matters and/or eastern Junggar coal are combusted, so that a pyrolysis hysteresis phenomenon is generated, and after the eutectic substance is bonded to a heated surface, the heated surface at about 500 ℃ is continuously heated, so that the organic matters are subjected to a thermal explosion effect, and the structure of the eutectic substance is loosened and falls off. Compared with the technology of adding high-melting point inert materials, the invention thoroughly solves the contamination problem. The method has the advantages of strong pertinence, small addition amount, good energy-saving effect, high combustion efficiency and improvement on equipment corrosion and abrasion.
Drawings
FIG. 1 is a photograph of an effective slagging staining object;
FIG. 2 shows the collection of slag-bonding and contamination objects of furnace tubes with no or poor effect.
Detailed Description
The invention provides a modulation material capable of changing the chemical structure of a combustion product of eastern Junggar coal and a method for combusting eastern Junggar coal in a large proportion in a coal-fired power generation and heat supply boiler, and a person skilled in the art can realize the modulation by properly improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides a modulation material capable of changing the chemical structure of a combustion product of eastern Junggar coal, which comprises the following components: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from one or more of crude oil, heavy oil, residual oil and kerogen with a kerogen structure.
The modulation material capable of changing the chemical structure of the combustion product of the eastern Junggar coal provided by the invention comprises 90-97 parts by mass of inorganic substances; preferably, the inorganic substance comprises 91-97 parts by mass; more preferably, the inorganic substance is contained in an amount of 92 to 97 parts by mass.
The inorganic matter is synthetic inorganic matter or natural inorganic matter.
According to the invention, the synthetic inorganic substance comprises:
60-90 parts by weight of aluminum silicate;
5-40 parts by weight of alkaline earth aluminosilicate;
5 to 10 parts by weight of an alkaline earth metal carbonate.
Specifically, the synthetic inorganic substance provided by the invention comprises 60-90 parts by weight of aluminum silicate; preferably 65 to 85 parts by weight of aluminum silicate; more preferably 70 to 80 parts by weight of aluminum silicate.
The source and purity of the aluminum silicate are not limited in the present invention and are commercially available as is well known to those skilled in the art. Such as Al2O9Si3。
The synthetic inorganic substance provided by the invention comprises 5-40 parts by weight of alkaline earth metal aluminosilicate; preferably, the alkali earth metal aluminosilicate is contained in an amount of 10 to 35 parts by weight. The alkaline earth metal of the present invention is preferably calcium or magnesium.
According to the present invention, the alkali metal aluminosilicate preferably comprises one or more of magnesium aluminosilicate, calcium aluminosilicate and calcium magnesium aluminosilicate; including but not limited to Ca2Al2(SiO3)5。
The synthetic inorganic substance provided by the invention preferably comprises 5-10 parts by weight of alkaline earth metal carbonate. The alkaline earth metal of the present invention is preferably calcium or magnesium.
According to the invention, the alkali metal carbonate comprises one or more of calcium carbonate, magnesium carbonate and calcium magnesium carbonate. The source and purity of the aluminum silicate are not limited in the present invention and are commercially available as is well known to those skilled in the art.
The invention creatively adopts the synergistic combination of the aluminum silicate, the alkaline earth metal aluminosilicate and the alkaline earth metal carbonate in the specific parts by mass, so that the addition of the high east Junggar coal can be achieved, and the heating surface of the boiler has less slag bonding and less pollution. The alkaline earth metal carbonate disclosed by the invention is matched with the rest of the alkaline earth metal carbonate in a temperature field of over 700 ℃, and is continuously decomposed and captured to form alkali metal sulfate, so that the alkaline earth metal carbonate has a certain sulfur fixing effect and reduces the high-temperature corrosion of a heating surface; meanwhile, the decomposed gas makes the eutectic with low melting point porous and loose.
The natural inorganic matter comprises clay minerals and aluminosilicate minerals; the clay mineral preferably comprises one or more of kaolinite, illite, montmorillonite, vermiculite and sepiolite; the aluminosilicate minerals comprise one or more of sillimanite and mullite. The source and purity of the aluminum silicate are not limited in the present invention and are commercially available as is well known to those skilled in the art. The mass fraction of the clay minerals in the natural inorganic substances is preferably 80-100%; the aluminosilicate mineral accounts for 0-20% of the natural inorganic substance by mass fraction.
The modulation material capable of changing the chemical structure of the combustion product of the eastern Junggar coal comprises 3-10 parts by mass of organic matters; preferably, the organic matter is 3-9 parts by mass; more preferably, the organic material is contained in an amount of 3 to 8 parts by mass.
The organic matter is selected from crude oil, heavy oil, residual oil, kerogen with a kerogen structure and other organic matters.
In the present invention, the sulfur content in the heavy oil or residual oil is preferably 1% or less.
The invention limits the Si/Ca ratio in the mixed material of the prepared material and the east-west coal to be more than 2. The Si/Ca ratio is limited, so that the final slagging is less and the contamination is less.
The invention provides a preparation method of a modulation material capable of changing the chemical structure of a burning product of eastern Junggar coal, which comprises the following steps:
mixing 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter.
The present invention is not limited to the specific mixing method described above. The specific components and proportions are clearly described and will not be described herein.
The invention provides application of the prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal in a coal-fired power generation and heat supply boiler in any technical scheme.
The prepared material is particularly suitable for large-proportion safe and efficient burning of coal varieties (called pseudo-east coal for short) which are produced by the eastern coal fields (called pseudo-east coal fields for short) of the pseudo-Sacurel basin in the Uygur autonomous region of Xinjiang in coal-fired power generation or coal-fired heat supply boilers, have medium-low-rank coal varieties with metamorphism and rich sodium element in the coal.
The heat supply boiler is suitable for all kinds of coal-fired boilers such as pulverized coal boilers, circulating fluidized bed boilers, industrial boilers and the like, and has wide application range.
After the product is used, the phenomena of slag bonding, contamination and corrosion of the heating surface of the coal-fired boiler, which affect the safe operation and the thermal efficiency of the boiler, do not occur.
The invention provides a method for burning a large proportion of east Junggar coal in a coal-fired power generation and heat supply boiler, which comprises the following steps:
the prepared material which can change the chemical structure of the combustion product of the eastern Junggar coal and is prepared by any one of the technical schemes is mixed with the eastern Junggar coal and combusted.
The mixing method of the present invention is not limited, and those skilled in the art will be familiar with it.
According to the invention, the proportion of the modulating material to the total mass percent of the burning material in the furnace is more than 5%; preferably, the content is 5 to 25 percent, and the lowest proportion can reach 5 percent.
The Si/Ca ratio in the mixed material of the prepared material and the east-west coal is more than 2. The invention limits the Si/Ca ratio in the mixed material of the prepared material and the east-west coal to be more than 2. The Si/Ca ratio is limited, so that the final slagging is less and the contamination is less.
After the materials are prepared by the method, the heating surface of the boiler easy to slag is blown by a soot blower regularly.
The using method of the prepared material is preferably as follows: crushing the prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal and mixing the crushed material with the eastern Junggar coal; or
Mixing the prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal with the eastern Junggar coal and then crushing;
according to the invention, the sodium element escape rate is preferably adopted to represent the sodium fixation effect, the sodium element escape rate is the mass fraction of the sodium element in the material in the volatilization escape body at high temperature compared with the mass fraction of the sodium element in the original material, and the lower the escape rate is, the better the sodium fixation effect is.
The method for measuring the high-temperature escape rate of sodium in coal comprises the following steps:
1. sample ashing reaction
Ashing of the samples was performed with reference to GB/T212: weighing a coal sample with the granularity of less than 0.2mm or a mixed sample (1 +/-0.1) g added with a modulating material in a cupel which is pre-burned to constant mass, burning and incinerating for 2h at the constant temperature of 400 ℃ in a muffle furnace, and obtaining an incinerated sample at 400 ℃.
2. High temperature melt reaction
According to the pyramid method specified in GB/T219, the ashing sample at 400 ℃ is prepared into an ash cone, the ash cone is placed in an ash melting point high-temperature furnace, the temperature is raised to the target temperature of 1100 ℃ according to the national standard, the atmosphere is controlled, the heating is stopped after the temperature is raised, and the ash cone is taken out to be used as a high-temperature melting sample after the temperature is cooled to the room temperature.
3. Determination of sodium element content
An ash sample and a raw coal sample were digested with a Multiwave 3000 microwave digestion instrument manufactured by Anton Paar corporation, the ash sample weighed about 20mg, the coal sample weighed about 400mg, and an acid for ash digestion: 5mL HNO3 and 1mLHF, coal digestion with acid: 6mL HNO3, 1mLHF, and 2mL H2O 2. Then, the contents of sodium elements in the ashed sample at 400 ℃ and the high-temperature molten sample thereof were measured by using an Optima 8000 ICP-OES inductively coupled plasma atomic emission spectrometer manufactured by PerkinElmer corporation.
4. Calculation of sodium escape Rate
The escape rate of sodium in the high-temperature melting reaction is calculated by taking ash converted to 400 ℃.
Ψ＝100(α-β)/α
In the formula
Ψ — escape rate of sodium,%;
α -sodium content, g, in ashed samples at 400 ℃;
β -corresponding to the sodium content in the 1100 ℃ high temperature melt sample, g.
The invention provides a modulation material capable of changing the chemical structure of a combustion product of eastern Junggar coal, which comprises the following components: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from organic matter of a kerogen structure, organic matter of a sapropel structure, heavy oil organic matter or residual oil organic matter. The inorganic substance provided by the invention continuously decomposes and captures harmful element sulfur in fuel in a temperature field of more than 700 ℃ to form alkali metal sulfate, has a certain sulfur fixing effect, and reduces high-temperature corrosion of a heating surface; meanwhile, the decomposed gas makes the eutectic with low melting point porous and loose. Organic matters in the prepared material are wrapped by a low-temperature eutectic substance formed after inorganic matters and/or eastern Junggar coal are combusted, so that a pyrolysis hysteresis phenomenon is generated, and after the eutectic substance is bonded to a heated surface, the heated surface at about 500 ℃ is continuously heated, so that the organic matters are subjected to a thermal explosion effect, and the structure of the eutectic substance is loosened and falls off. Compared with the technology of adding high-melting point inert materials, the invention thoroughly solves the contamination problem. The method has the advantages of strong pertinence, small addition amount, good energy-saving effect, high combustion efficiency and improvement on equipment corrosion and abrasion.
To further illustrate the present invention, the following examples are provided to describe a conditioned material capable of changing the chemical structure of the combustion product of eastern Junggar coal and a method for burning a large proportion of eastern Junggar coal in a coal-fired power generation and heat supply boiler.
Example 1
94% of a coal of the east China, the addition ratio of the preparation is 6%, and 94% of inorganic substances in the preparation, wherein: aluminum silicate: 90 percent; magnesium aluminum silicate: 5 percent; 5% of magnesium carbonate; the organic matter 6% is heavy oil.
The Si/Ca ratio of the mixture is 2.00 and the escape rate of sodium element is 5.32 percent.
The corresponding slag bonding contamination product has loose structure, is easy to fall off, and is not easy to slag and stain.
Example 2
90% of a certain east Junggar coal, the addition ratio of the concoction is 10%, and the concoction comprises: 93% of inorganic matters: aluminum silicate: 80 percent; calcium aluminum silicate: 15 percent; 5% of calcium carbonate; 7% of organic matter: a residual oil.
The Si/Ca ratio of the mixture is 2.22, and the escape rate of sodium element is 2.43 percent.
The corresponding slag bonding contamination product has loose structure, is easy to fall off, and is not easy to slag and stain.
Example 3
85% of certain east China coal, and the addition ratio of the concoction is 15%, wherein: 95% of inorganic substances: aluminum silicate: 75 percent; calcium aluminum silicate: 20 percent; 5% of calcium carbonate; 5% of organic matter: crude oil.
The Si/Ca ratio of the mixture is 2.68, and the escape rate of sodium element is 0.00%.
The corresponding slag bonding contamination product has loose structure, is easy to fall off, and is not easy to slag and stain.
Example 4
80% of certain east Junggar coal, and the addition ratio of the prepared product is 20%, wherein: 96% of inorganic substances: aluminum silicate: 80 percent; calcium aluminum silicate: 10 percent; 10% of calcium carbonate; 4% of organic matter: an oleosin extract.
The Si/Ca ratio of the mixture is 2.85, and the escape rate of sodium element is 0.00%.
Example 5
90% of a certain east Junggar coal, the addition ratio of the concoction is 10%, and the concoction comprises: 94% of inorganic matter: 80% of kaolinite; 20% of mullite; 6% of organic matter: heavy oil.
The Si/Ca ratio of the mixture is 2.53, and the escape rate of sodium element is 0.00%.
The corresponding slag bonding contamination product has loose structure, is easy to fall off, and is not easy to slag and stain.
Example 9
90% of a certain east Junggar coal, the addition ratio of the concoction is 10%, and the concoction comprises: 93% of inorganic matters: 80% of montmorillonite; 20% of sillimanite; 7% of organic matter: a residual oil.
The Si/Ca ratio of the mixture is 2.24, and the escape rate of sodium element is 2.00%.
The corresponding slag bonding contamination product has loose structure, is easy to fall off, and is not easy to slag and stain.
The corresponding slag-bonded contaminated product in all the examples had a loose structure, as shown in FIG. 1, which is a photograph of an effective slag-bonded contaminated object.
Comparative example 1
When the prepared product is added at 0%, the Si/Ca ratio of a certain east-west coal is 0.20, and the escape rate of sodium element and sodium element in the east-west coal is 41.54%.
The corresponding slagging contamination product has a compact structure, as shown in fig. 2, and fig. 2 is the furnace tube slagging contamination object collection with no effect or poor effect.
Comparative example 2
85% of certain east China coal, and the addition ratio of the concoction is 15%, wherein: 96% of inorganic substances: 40% of quartz sand; 60% of magnesite; 4% of organic matter: heavy oil.
Although the Si/Ca ratio of the mixture is more than 2, the escape rate of the sodium element is 38%.
Due to SiO in the quartz sand2No reactivity, so that sodium element can not be captured, and the heating surface is seriously abraded.
Comparative example 3
90% of a certain east Junggar coal, the addition ratio of the concoction is 15%, and the concoction comprises: 97% of inorganic substance: aluminum silicate: 60 percent; calcium aluminum silicate: 40 percent; 3% of organic matters: heavy oil.
The Si/Ca ratio of the mixture is 2.00, and the escape rate of sodium element is 4.90%.
But SOx emissions increase.
Comparative example 4
85% of certain east China coal, and the addition ratio of the concoction is 15%, wherein: 100% of inorganic substances: aluminum silicate: 60 percent; calcium aluminum silicate: 35 percent; 5 percent of calcium carbonate.
The Si/Ca ratio of the mixture is 2.17, and the escape rate of sodium element is 4.00%.
However, the slag bonding is similar to that shown in figure 2, the structure is compact and easy, and the dirt on the heating surface is not easy to fall off.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A conditioned material capable of altering the chemical structure of a product of the combustion of eastern Junggar coal, comprising: 90-97 parts by mass of inorganic matter and 3-10 parts by mass of organic matter; the inorganic substance is synthetic inorganic substance or natural inorganic substance; the organic matter is selected from one or more of crude oil, heavy oil, residual oil and kerogen with a kerogen structure; the sulfur content in the heavy oil or residual oil is below 1 percent;
the synthetic inorganic substance comprises:
60-90 parts by weight of aluminum silicate;
5-40 parts by weight of alkaline earth aluminosilicate;
5-10 parts by weight of an alkaline earth metal carbonate;
the alkaline earth metal aluminosilicate comprises one or more of magnesium aluminosilicate, calcium aluminosilicate and calcium magnesium aluminosilicate; the alkaline earth metal carbonate comprises one or more of calcium carbonate, magnesium carbonate and calcium magnesium carbonate;
the natural inorganic matter comprises clay minerals and aluminosilicate minerals; the clay mineral comprises one or more of kaolinite, illite, montmorillonite, vermiculite and sepiolite, and accounts for 80-95% of natural inorganic matter by mass; the aluminosilicate minerals comprise one or more of sillimanite and mullite, and the aluminosilicate minerals account for 5-20% of natural inorganic substances by mass.
2. The use of the conditioned material of claim 1 capable of altering the chemical structure of a product of the combustion of eastern coal in a coal-fired power generation and heat supply boiler; the power generation and heat supply boiler comprises a pulverized coal boiler or a circulating fluidized bed boiler.
3. A method for burning a large proportion of east China coal in a coal-fired power generation and heat supply boiler is characterized by comprising the following steps:
mixing the prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal as claimed in claim 1 with the eastern Junggar coal, and combusting;
the modulating material accounts for more than 5 percent of the total mass percent of the burning materials in the furnace; the Si/Ca ratio in the mixed material of the prepared material and the east-west coal is more than 2.
4. The method of claim 3, further comprising periodically purging the slagging-prone boiler heating surface with a soot blower.
5. The method of claim 3, wherein the conditioned material capable of changing the chemical structure of the products of the combustion of the eastern Junggar coal is crushed and mixed with the eastern Junggar coal; or
The prepared material capable of changing the chemical structure of the combustion product of the eastern Junggar coal is mixed with the eastern Junggar coal and then crushed.
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| CN102329676A (en) * | 2011-07-30 | 2012-01-25 | 湖南晟通科技集团有限公司 | Liquid coke inhibitor |
| CN103232876A (en) * | 2013-05-27 | 2013-08-07 | 深圳市明灯科技有限公司 | Boiler coking inhibitor |
| CN105670732A (en) * | 2016-03-09 | 2016-06-15 | 太原理工大学 | Method for reducing contamination of high-sodium coal |
| CN107219325A (en) * | 2017-04-28 | 2017-09-29 | 华电电力科学研究院 | A kind of boiler uses the test method of discrimination of high sodium coal and its mixed coal contamination |
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| CN102329676A (en) * | 2011-07-30 | 2012-01-25 | 湖南晟通科技集团有限公司 | Liquid coke inhibitor |
| CN103232876A (en) * | 2013-05-27 | 2013-08-07 | 深圳市明灯科技有限公司 | Boiler coking inhibitor |
| CN105670732A (en) * | 2016-03-09 | 2016-06-15 | 太原理工大学 | Method for reducing contamination of high-sodium coal |
| CN107219325A (en) * | 2017-04-28 | 2017-09-29 | 华电电力科学研究院 | A kind of boiler uses the test method of discrimination of high sodium coal and its mixed coal contamination |
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