CN111621349A - Anti-coking agent for waste residue boiler and adding method - Google Patents
Anti-coking agent for waste residue boiler and adding method Download PDFInfo
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- CN111621349A CN111621349A CN202010531812.4A CN202010531812A CN111621349A CN 111621349 A CN111621349 A CN 111621349A CN 202010531812 A CN202010531812 A CN 202010531812A CN 111621349 A CN111621349 A CN 111621349A
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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
- C10L10/06—Use of additives to fuels or fires for particular purposes for facilitating soot removal
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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
- C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
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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
Abstract
The invention provides a coking-resistant agent for a waste residue boiler and an adding method thereof, relating to the technical field of coking-resistant agents. The coke-resistant agent for the waste residue boiler and the adding method thereof comprise the following raw materials in parts by weight: 10-16 parts of kaolin, 15-22 parts of calcium oxide, 8-16 parts of fly ash, 6-12 parts of magnesium nitrate, 5-10 parts of magnesium-based nitrate, 5-10 parts of boric acid, 20-30 parts of water, 5-8 parts of combustion improver, 4-8 parts of catalyst and 7-13 parts of swelling agent. The boiler anti-coking agent prepared by the formula and the method is scientific and reasonable, has simple process and convenient popularization, can accelerate the splitting of boiler coking by adding magnesium nitrate, magnesium-based nitrate and boric acid in use, thereby leading the coking on the boiler to fall off, effectively removing the boiler coking in use, and simultaneously leading generated toxic substances to be fully combusted by the combustion improver and the catalyst in use, and reducing the generation of toxic substances.
Description
Technical Field
The invention relates to the technical field of anti-coking agents, in particular to an anti-coking agent for a waste residue boiler and an adding method thereof.
Background
In the long-term operation process of the waste residue boiler, due to the problems of large change of coal quality for combustion, self defects of boiler design, local high temperature, improper operation and the like, coking and ash deposition of pipelines of a superheater and a reheater are easily generated on the heating surface of a water cooling wall, so that the heat exchange efficiency of the boiler is reduced, the exhaust gas temperature is increased, and the waste of coal resources is serious. When coking and dust deposition are serious, large coke blocks fall off to easily cause fire extinguishing accidents of the boiler, great potential safety hazards exist, at the moment, an enterprise usually needs to shut down the boiler to remove coking and dust deposition, great economic loss is caused to the enterprise, and meanwhile, the problem that sulfate corrodes the boiler wall is easily generated at the coking position, so that the service life of the boiler is shortened. However, in the prior art, most of the existing boiler coking problems adopt a mode of doping slag soil in fuel to relieve coking, but the quality of the boiler fuel is seriously reduced due to the addition of a large amount of slag soil, the coking inhibition effect is not ideal, and the problem cannot be fundamentally solved.
Disclosure of Invention
The invention aims to provide a waste residue boiler anti-coking agent and an adding method thereof, which can effectively remove coking of a boiler in use and can effectively reduce the generation of toxic gas in use.
In order to achieve the purpose, the invention is realized by the following technical scheme: the waste residue boiler anti-coking agent comprises the following raw materials in parts by weight: 10-16 parts of kaolin, 15-22 parts of calcium oxide, 8-16 parts of fly ash, 6-12 parts of magnesium nitrate, 5-10 parts of magnesium-based nitrate, 5-10 parts of boric acid, 20-30 parts of water, 5-8 parts of combustion improver, 4-8 parts of catalyst and 7-13 parts of swelling agent.
As a further scheme of the invention: the feed comprises the following raw materials in parts by weight: 10 parts of kaolin, 15 parts of calcium oxide, 8 parts of fly ash, 6 parts of magnesium nitrate, 5 parts of magnesium-based nitrate, 5 parts of boric acid, 20 parts of water, 5 parts of combustion improver, 4 parts of catalyst and 7 parts of swelling agent.
As a further scheme of the invention: the feed comprises the following raw materials in parts by weight: 13 parts of kaolin, 19 parts of calcium oxide, 12 parts of fly ash, 9 parts of magnesium nitrate, 8 parts of magnesium-based nitrate, 8 parts of boric acid, 25 parts of water, 7 parts of combustion improver, 6 parts of catalyst and 10 parts of swelling agent.
As a further scheme of the invention: the feed comprises the following raw materials in parts by weight: 16 parts of kaolin, 22 parts of calcium oxide, 16 parts of fly ash, 12 parts of magnesium nitrate, 10 parts of magnesium-based nitrate, 10 parts of boric acid, 30 parts of water, 8 parts of combustion improver, 8 parts of catalyst and 13 parts of swelling agent.
As a further scheme of the invention: the combustion improver is any one of boron organic compound, fatty acid copper salt and copper naphthenate salt.
As a further scheme of the invention: the catalyst is any one of a solid acid catalyst, a metal oxide catalyst, a complex catalyst, a rare earth catalyst and a biocatalyst.
As a further scheme of the invention: the swelling agent is any one of ammonium nitrate, baking powder, baking soda and alum.
A coke-resistant agent for a waste residue boiler and an adding method thereof comprise the following steps:
s1, weighing the raw materials in proportion, putting kaolin, calcium oxide, fly ash, magnesium nitrate, magnesium-based nitrate, boric acid and water into a vertical stirrer for stirring, wherein the rotating speed of a stirring paddle is 250r/min, and the stirring time is 7-9 h;
s2, adding a combustion improver, a catalyst and a swelling agent in sequence after stirring in S1, and continuing stirring, wherein the rotating speed of a stirring paddle is 300r/min, and the stirring time is 4-6 h, so that the boiler anti-coking agent is prepared;
and S3, spraying compressed air into the high-temperature part inside the boiler from the observation hole of the boiler, and throwing the anti-coking agent into the coal thrower through the observation hole of the boiler by adopting the coal thrower.
Further, in the operation step according to S3, the anti-coking agent is added in 2 to 4 times per day.
The invention provides a coke-resistant agent for a waste residue boiler and an adding method thereof. The method has the following beneficial effects:
the boiler anti-coking agent prepared by the formula and the method is scientific and reasonable, simple in process and convenient to popularize, can accelerate the splitting of boiler coking by adding magnesium nitrate, magnesium-based nitrate and boric acid in use, so that the coking on the boiler can fall off, can effectively remove the coking of the boiler in use, can effectively and fully burn generated toxic substances by using a combustion improver and a catalyst, reduces the generation of the toxic substances, and throws the boiler anti-coking agent into the boiler by using a coal thrower.
Drawings
FIG. 1 is an XRD pattern of samples X1, X2 and X3 of the present invention after incubation at 1300 ℃ for 3 h;
FIG. 2 is an XRD pattern of sample X2 after incubation for 3h at different temperatures in accordance with the present invention;
FIG. 3 is an SEM photograph of the fracture of sample X2 after being burned at different temperatures in the present invention;
FIG. 4 is a graph showing the bulk density, apparent porosity and linear shrinkage of sample X2 after firing at different temperatures in accordance with the present invention;
FIG. 5 shows the strength of sample X2 after different temperature treatments and the shear strength of the bonded sample in accordance with the present invention.
Detailed Description
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
Specifically, the combustion improver is any one of a boron organic compound, a copper salt of fatty acid and a copper salt of naphthenic acid.
Specifically, the catalyst is any one of a solid acid catalyst, a metal oxide catalyst, a complex catalyst, a rare earth catalyst, and a biocatalyst.
Specifically, the swelling agent is any one of ammonium nitrate, baking powder, baking soda and alum.
A coke-resistant agent for a waste residue boiler and an adding method thereof comprise the following steps:
s1, weighing the raw materials in proportion, putting kaolin, calcium oxide, fly ash, magnesium nitrate, magnesium-based nitrate, boric acid and water into a vertical stirrer for stirring, wherein the rotating speed of a stirring paddle is 250r/min, and the stirring time is 7-9 h.
And S2, adding the combustion improver, the catalyst and the swelling agent in sequence after stirring in S1, and continuing stirring, wherein the rotating speed of a stirring paddle is 300r/min, and the stirring time is 4-6 h, so that the boiler anti-coking agent is prepared.
And S3, spraying compressed air into the high-temperature part inside the boiler from the observation hole of the boiler, throwing the anti-coking agent of the boiler into the coal thrower through the observation hole of the boiler by adopting a coal thrower, and adding the anti-coking agent for 2-4 times every day.
Specifically, the combustion improver is any one of a boron organic compound, a copper salt of fatty acid and a copper salt of naphthenic acid.
Specifically, the catalyst is any one of a solid acid catalyst, a metal oxide catalyst, a complex catalyst, a rare earth catalyst, and a biocatalyst.
Specifically, the swelling agent is any one of ammonium nitrate, baking powder, baking soda and alum.
A coke-resistant agent for a waste residue boiler and an adding method thereof comprise the following steps:
s1, weighing the raw materials in proportion, putting kaolin, calcium oxide, fly ash, magnesium nitrate, magnesium-based nitrate, boric acid and water into a vertical stirrer for stirring, wherein the rotating speed of a stirring paddle is 250r/min, and the stirring time is 7-9 h.
And S2, adding the combustion improver, the catalyst and the swelling agent in sequence after stirring in S1, and continuing stirring, wherein the rotating speed of a stirring paddle is 300r/min, and the stirring time is 4-6 h, so that the boiler anti-coking agent is prepared.
And S3, spraying compressed air into the high-temperature part inside the boiler from the observation hole of the boiler, throwing the anti-coking agent of the boiler into the coal thrower through the observation hole of the boiler by adopting a coal thrower, and adding the anti-coking agent for 2-4 times every day.
Embodiment 3 discloses a coking resistant agent for a waste residue boiler, which comprises the following raw materials in parts by weight: 16 parts of kaolin, 22 parts of calcium oxide, 16 parts of fly ash, 12 parts of magnesium nitrate, 10 parts of magnesium-based nitrate, 10 parts of boric acid, 30 parts of water, 8 parts of combustion improver, 8 parts of catalyst and 13 parts of swelling agent, the boiler anti-coking agent prepared by the formula and the method of the invention is scientific, reasonable, simple in process and convenient to popularize, can accelerate the splitting of boiler coking by adding the magnesium nitrate, the magnesium-based nitrate and the boric acid in use, thereby leading the coking on the boiler to fall off, can effectively remove the boiler coking in use, can effectively lead the generated toxic substances to be fully combusted by using the combustion improver and the catalyst, reduces the generation of toxic substances, and throws the boiler anti-coking agent into the boiler by using a coal thrower, has simple adding mode and does not need complex mechanical adding equipment in use, is convenient to be added and used.
Specifically, the combustion improver is any one of a boron organic compound, a copper salt of fatty acid and a copper salt of naphthenic acid.
Specifically, the catalyst is any one of a solid acid catalyst, a metal oxide catalyst, a complex catalyst, a rare earth catalyst, and a biocatalyst.
Specifically, the swelling agent is any one of ammonium nitrate, baking powder, baking soda and alum.
A coke-resistant agent for a waste residue boiler and an adding method thereof comprise the following steps:
s1, weighing the raw materials in proportion, putting kaolin, calcium oxide, fly ash, magnesium nitrate, magnesium-based nitrate, boric acid and water into a vertical stirrer for stirring, wherein the rotating speed of a stirring paddle is 250r/min, and the stirring time is 7-9 h.
And S2, adding the combustion improver, the catalyst and the swelling agent in sequence after stirring in S1, and continuing stirring, wherein the rotating speed of a stirring paddle is 300r/min, and the stirring time is 4-6 h, so that the boiler anti-coking agent is prepared.
And S3, spraying compressed air into the high-temperature part inside the boiler from the observation hole of the boiler, throwing the anti-coking agent of the boiler into the coal thrower through the observation hole of the boiler by adopting a coal thrower, and adding the anti-coking agent for 2-4 times every day.
Examples 1, 2 and 3 differ in the content of the components therein, and the preparation method and the addition method thereof are the same.
Three types of anti-coking agents, designated X1, X2, X3, were prepared as required in example 1, example 2 and example 3 above. FIG. 1 is an XRD pattern of samples X1, X2 and X3 after incubation at 1300 deg.C for 3 h. As can be seen from the figure, mullite is generated after the sintering at 1300 ℃, and the products after the sintering of different samples contain corundum, cristobalite, anorthite and mullite. In this case, the samples X3 and β -SiO2 having a silica mass ratio of 5: 3 were increased. As excessive silicon micro powder forms a large amount of glass phase at high temperature, the material is over-burnt, and the mechanical property of the sample is seriously influenced by the expansion and deformation of the sample after burning.
FIG. 2 is an XRD spectrum of sample X2 after heat preservation at 1300-1600 deg.C for 3h, which shows that α -Al exists in sample X2 at 1300 deg.C2O3、β-SiO2、CaAl2Si2O8And 3Al2O3·2SiO2Added SiO2The micro powder is not completely reacted. CaAl in sample X2 as the temperature increased to 1500 deg.C2Si2O8The phase disappears, the intensity of the relative diffraction peak of the mullite is enhanced, and the crystallinity is increased. This is probably due to CaAl2Si2O8Decomposition to SiO at high temperature2And Al2O3Further promoting the generation of mullite, and when the sintering temperature is increased to 1600 ℃, the phase in the sample is α -Al2O3And 3Al2O3·2SiO2。
FIG. 3 is an SEM photograph of X2 fractures of samples after different temperatures of firing. It can be seen that short columnar grains and long columnar grains are generated at 1300 ℃, and the energy spectrum diagram of the crystal is shown as anorthite, and is shown in figure 3 (a); when the firing temperature is 1400 ℃, irregular grains and columnar mullite exist, as shown in figure 3 (b); part of mullite is agglomerated at 1500 ℃, and is shown in figure 3 (c); the growth of the crystal grains is regular when the sintering temperature reaches 1600 ℃, and the generation of long columnar mullite can be clearly seen, as shown in figure 3 (d).
FIG. 4 shows the effect of different temperatures on the bulk density, apparent porosity, and linear shrinkage of sample X2. As can be seen from FIG. 4(a), as the firing temperature increases, the sample is fired to be densified, the bulk density increases, and the apparent porosity decreases. As can be seen from FIG. 4(b), the sample shrinks with increasing firing temperature, and the shrinkage of sample X2 at 1600 ℃ is about 11%.
Fig. 5 shows the strength of sample X2 and the bonded sample after different temperature treatments. As can be seen from FIG. 5(a), the flexural strength of sample X2 is at its maximum at 1600 ℃ and the compressive strength does not change significantly with the firing temperature, and is 20 to 28MPa, as the firing temperature increases. As can be seen from FIG. 5(b), since sintering is performed at a low temperature, no chemical reaction occurs between the raw materials, and the shear strength is low. With the increase of the firing temperature, the shear strength is firstly reduced and then increased, and the high-strength high-.
In order to further illustrate the beneficial effects of the invention, the inventor selects the existing anti-coking agent, selects the anti-coking agent prepared by the invention at the same time, compares the decoking effect, the toxic substance emission and the service time of the anti-coking agent, and obtains the following data, which are detailed in table 1:
TABLE 1 Experimental data sheet
The experimental data show that the decoking effect of the embodiments 1-3 is greatly improved, and the splitting of the boiler coking can be accelerated by adding the magnesium nitrate, the magnesium-based nitrate and the boric acid in use, so that the coking on the boiler can be dropped, the coking of the boiler can be effectively cleared away in use, meanwhile, the emission of toxic substances is obviously reduced, the generated toxic substances can be effectively and fully combusted in use, and the generation of the toxic substances is reduced, which indicates that the anti-coking agent of the embodiments 1-3 can effectively clear the coking of the boiler in use, and meanwhile, the generated toxic substances can be effectively and fully combusted in use, so that the generation of the toxic substances is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (9)
1. The anti-coking agent for the waste residue boiler is characterized by comprising the following raw materials in parts by weight: 10-16 parts of kaolin, 15-22 parts of calcium oxide, 8-16 parts of fly ash, 6-12 parts of magnesium nitrate, 5-10 parts of magnesium-based nitrate, 5-10 parts of boric acid, 20-30 parts of water, 5-8 parts of combustion improver, 4-8 parts of catalyst and 7-13 parts of swelling agent.
2. The slag boiler anti-coking agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 10 parts of kaolin, 15 parts of calcium oxide, 8 parts of fly ash, 6 parts of magnesium nitrate, 5 parts of magnesium-based nitrate, 5 parts of boric acid, 20 parts of water, 5 parts of combustion improver, 4 parts of catalyst and 7 parts of swelling agent.
3. The slag boiler anti-coking agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 13 parts of kaolin, 19 parts of calcium oxide, 12 parts of fly ash, 9 parts of magnesium nitrate, 8 parts of magnesium-based nitrate, 8 parts of boric acid, 25 parts of water, 7 parts of combustion improver, 6 parts of catalyst and 10 parts of swelling agent.
4. The slag boiler anti-coking agent according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 16 parts of kaolin, 22 parts of calcium oxide, 16 parts of fly ash, 12 parts of magnesium nitrate, 10 parts of magnesium-based nitrate, 10 parts of boric acid, 30 parts of water, 8 parts of combustion improver, 8 parts of catalyst and 13 parts of swelling agent.
5. The anti-coking agent for waste residue boilers as claimed in any one of claims 1 to 4, wherein the combustion improver is any one of boron organic compounds, copper salts of fatty acids and copper salts of naphthenic acids.
6. The coke-resistant agent for waste residue boilers as claimed in any one of claims 1 to 4, wherein the catalyst is any one of solid acid catalyst, metal oxide catalyst, complex catalyst, rare earth catalyst and biocatalyst.
7. The slag boiler anti-coking agent according to any one of claims 1 to 4, wherein the bulking agent is any one of ammonium nitrate, baking powder, baking soda and alum.
8. The anti-coking agent and the adding method for the waste residue boiler as claimed in any one of claims 1 to 4, wherein the method comprises the following steps:
s1, weighing the raw materials in proportion, putting kaolin, calcium oxide, fly ash, magnesium nitrate, magnesium-based nitrate, boric acid and water into a vertical stirrer for stirring, wherein the rotating speed of a stirring paddle is 250r/min, and the stirring time is 7-9 h;
s2, adding a combustion improver, a catalyst and a swelling agent in sequence after stirring in S1, and continuing stirring, wherein the rotating speed of a stirring paddle is 300r/min, and the stirring time is 4-6 h, so that the boiler anti-coking agent is prepared;
and S3, spraying compressed air into the high-temperature part inside the boiler from the observation hole of the boiler, and throwing the anti-coking agent into the coal thrower through the observation hole of the boiler by adopting the coal thrower.
9. The slag boiler anti-coking agent and the adding method thereof according to the claim 8, characterized in that in the operation step according to S3, the anti-coking agent is added 2-4 times a day.
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| CN202010531812.4A CN111621349A (en) | 2020-06-11 | 2020-06-11 | Anti-coking agent for waste residue boiler and adding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112759374A (en) * | 2020-12-31 | 2021-05-07 | 上海化学工业区升达废料处理有限公司 | Anti-coking agent for hazardous waste incineration line and preparation method thereof |
| CN115418258A (en) * | 2022-09-14 | 2022-12-02 | 滁州智慧城市环保科技有限责任公司 | Boiler coking inhibitor and preparation method thereof |
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Application publication date: 20200904 |