CN114907899A - Composite decoking agent for household garbage incineration boiler - Google Patents
Composite decoking agent for household garbage incineration boiler Download PDFInfo
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- CN114907899A CN114907899A CN202210655609.7A CN202210655609A CN114907899A CN 114907899 A CN114907899 A CN 114907899A CN 202210655609 A CN202210655609 A CN 202210655609A CN 114907899 A CN114907899 A CN 114907899A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The application belongs to the technical field of decoking agents, and particularly relates to a composite decoking agent for a household garbage incineration boiler. The composite decoking agent is calculated according to mass fraction and comprises the following components; 83-88% of water; 8-10% of a fusing inhibitor; 0.5-1.5% of a catalyst; 1-2% of a combustion improver; 1-2% of a corrosion inhibitor; 1-2% of sintering resistant agent; wherein, the fusing inhibitor: the mass ratio of the combustion improver is 10 (1-1.5). The application aims at providing the high-efficiency composite decoking agent for solving the slagging phenomenon of the household garbage boiler in the operation process, can effectively reduce and avoid the slagging tendency of the household garbage in the combustion process, improves the combustion performance of the household garbage, prolongs the operation period of the household garbage incineration boiler, and reduces unnecessary economic loss. In addition, the compound decoking agent that this application provided sprays with liquid mode, can embody the effect of decoking agent to the maximize.
Description
Technical Field
The application belongs to the technical field of decoking agents, and particularly relates to a composite decoking agent for a household garbage incineration boiler.
Background
With the improvement of the living standard of residents, the production amount of household garbage is increased day by day. According to relevant statistics, the yield of the urban domestic garbage is up to 3.6 hundred million tons in 2020. The improper treatment of the household garbage can cause serious environmental pollution problems and threaten the self health of human beings. Therefore, the treatment of the domestic garbage can become the limitation of sustainable development. At present, the treatment modes for domestic garbage mainly include landfill, heat treatment and the like. Although the landfill of the domestic garbage can treat the existing garbage on a large scale, landfill leachate which is difficult to treat is generated and flows into underground water to cause deterioration of water quality, and meanwhile, the domestic garbage is a resource, and the landfill causes waste of the resource. Thermal treatment such as pyrolysis and gasification has strict requirements on the type and properties of raw materials. At present, most domestic garbage in China is not classified, so that the domestic garbage is complex in type and high in inorganic matter content, and is not suitable for thermal treatment such as pyrolysis, gasification and the like. However, the incineration of household garbage is concerned about alleviating the increasingly worsened environmental problems and energy crisis. The incineration of the household garbage is relatively mature in technology, and the power generation can be carried out, so that the treatment of reduction, harmlessness and recycling of the household garbage is realized to the maximum extent. At present, the scale of the domestic waste incineration treatment is about 59.4 ten thousand tons/day, and the proportion of the incineration treatment capacity is increased year by year. It is expected that the incineration of household garbage will be the mainstream garbage disposal mode in the future.
However, the domestic garbage is easy to deposit and slag on the heated surface during the incineration process. At present, the phenomena of dust deposition and slag bonding on a heating surface commonly exist in the running process of a household garbage incineration plant. The phenomenon not only causes the gas exhaust temperature in the furnace to be overhigh, influences heat transfer and reduces the power generation efficiency of the boiler, but also once serious slagging and blocking phenomena occur in the pipeline, the furnace has to be shut down for maintenance at the moment, and the operation period is shortened. The coexistence of these problems causes the power plant to be shut down periodically during the operation process, thereby reducing the operation period of the boiler and causing great economic loss.
The ash deposition and slagging phenomenon generated in the combustion process of the household garbage is mainly related to the mineral behavior in the ash. Part of alkali metals such as Na, K and the like in the fly ash component can react with SiO at high temperature 2 And the low-temperature eutectic substance is formed, and then the low-temperature eutectic substance is changed into a molten or even softened state, and the low-temperature eutectic substance migrates to the heating surface due to the heat absorption effect of the heating surface and then adheres to the heating surface to form the phenomena of dust deposition and slag bonding. Therefore, chemical agents can be added into the incinerator to change the chemical process and occurrence state of the minerals in the household garbage in the combustion process, and the phenomenon of ash deposition and slag bonding can be effectively avoided. At present, the decoking agent applied to the market mainly achieves the purposes of removing ash and decoking by improving the melting temperature of ash, changing the structure of a coke layer and the like. The decoking agent mainly comprises a fusing inhibitor, a combustion improver and the like. The fluxing agent mainly reacts with mineral matters in the ash to convert fluxing mineral matters in the ash into refractory mineral matters, so that the melting temperature of the ash is increased, and the coking tendency of the ash is effectively reduced. Through a large amount of researches, additives such as aluminum base, phosphate, magnesium base and the like can improve the melting temperature of ash and have excellent melting resistance. The combustion improver can improve the combustion efficiency of the household garbage, reduce the ignition point and improve the combustion performance on one hand, and can promote the secondary combustion of the unburned coke and organic matters in the coke block to loosen the coke layer so as to fall off from the incineration equipment on the other hand.
The ash content of the fuel is different, and the thermochemical behavior of the minerals at high temperature is different, so that the slagging mechanism of different fuels is different in the combustion process. The appearance and physical state of the slag body on the heating surface of the boiler are closely related to the thermochemical behavior of minerals. Therefore, the proper decoking agent is selected according to the properties of different types of fuels. Otherwise, the effect of removing ash and coke is not achieved, but the tendency of coking is increased. However, by searching the patents of the national intellectual property office on decoking, the majority of the published ash-cleaning decoking agents are developed only for coal-fired boilers. Compared with the coal, the combustible domestic garbage has obvious differences in the content of different components (volatile components, fixed carbon and ash content), the components of the ash content, the heat value and the like, so most of the decoking agents are not suitable for the domestic garbage incinerator, and the problem of slagging in the incineration process of a domestic garbage boiler can not be solved. Meanwhile, different adding modes of the decoking agent have different decoking effects. At present, the adding mode mainly comprises dry adding, spraying adding, dipping adding and the like. The dry adding method is mostly used in industry, mainly the decoking agent is crushed and then mechanically mixed with the fuel for use, but the uniform mixing of the decoking agent and the fuel is difficult to ensure, and the relative effect is poor. The dipping addition is to dip the fuel in the decoking agent solution sufficiently, so that the decoking agent can be uniformly distributed in the fuel, but dipping liquid which is difficult to treat is generated, and the fuel after dipping contains a large amount of water, and needs to be dried and combusted, so that the cost is increased.
Disclosure of Invention
The application aims at providing the high-efficiency composite decoking agent for solving the slagging phenomenon of the household garbage boiler in the operation process, can effectively reduce and avoid the slagging tendency of the household garbage in the combustion process, improves the combustion performance of the household garbage, prolongs the operation period of the household garbage incineration boiler, and reduces unnecessary economic loss. In addition, the compound decoking agent that this application provided sprays with liquid mode, can embody the effect of decoking agent to the maximize.
The application provides a composite decoking agent for a household garbage incineration boiler, which comprises the following components in percentage by mass;
wherein, the fusing inhibitor: the mass ratio of the combustion improver is 10 (1-1.5).
In particular, water acts as a solvent, which can dissolve all chemical agents. The components adopted are nitrates which have high solubility in water. The liquid decoking agent can increase the contact area of the active components and the household garbage, and enhance the performances of decoking, ash removal, combustion supporting, corrosion prevention and the like of different components.
In another embodiment, the fluxing agent is selected from one or more of calcium nitrate, aluminum nitrate, and magnesium nitrate.
Specifically, the fusing inhibitor mainly adopts one or two of calcium nitrate, aluminum nitrate and magnesium nitrate. When the content of calcium and magnesium elements in the ash is low, the calcium and magnesium elements and silicon elements form a low-temperature eutectic body, and the melting characteristic temperature of the ash is reduced. The addition of magnesium nitrate in the decoking agent changes the occurrence state of magnesium element to form mineral substances such as forsterite, akermanite and the like.
2CaSiO 3 +3MgO+SiO 2 →Ca 2 MgSi 2 O 7 +Mg 2 SiO 4 。
The melting points of the materials such as forsterite, akermanite and the like are higher and reach 1890 ℃ and 1450 ℃ respectively, so that the melting temperature of ash is increased, and the slagging phenomenon is inhibited. At the same time, the addition of calcium nitrate and magnesium nitrate also suppresses the formation of molten slag. According to related research, the melting degree of ash is directly related to the slagging property in the fuel combustion process. When the content of molten slag in the ash is high, ash particles are more easily adhered to the heating surface, so that the serious slagging phenomenon is caused. The addition of magnesium nitrate or calcium nitrate increases magnesium (or calcium) aluminosilicate in a solid phase, inhibits the formation of molten liquid slag, enables an ash deposition layer to become dry, is not easy to adhere to ash particles, and improves the slagging tendency.
Al 2 O 3 The melting point of the self-body is higher, the self-body plays a role of a skeleton in ash, and the melting temperature of the ash can be improved. From the viewpoint of ionic potential, Al 3+ The ionic potential of the inorganic oxide is higher, the inorganic oxide is easy to form polymers with oxygen elements, the fluidity of ash is reduced, and the ash melting point is improved.
Al 2 O 3 +2SiO 2 →Al 2 O 3 ·2SiO 2 。
Alumina reacts with silicon dioxide in the ash to generate refractory mineral metakaolin and the like, so that the melting temperature of the ash is increased, the softening degree of the ash under high-temperature combustion is reduced, and the condition of contamination and slagging on a heating surface is avoided. At the same time, the user can select the desired position,the generated metakaolin can react with KCl, KOH and K 2 SO 4 And potassium-containing compounds generate potassium aluminosilicate, so that potassium element is solidified in ash, the generation of gaseous potassium salt is reduced, and the occurrence of corrosion is avoided.
Al 2 O 3 ·2SiO 2 +KCl+2SiO 2 +H 2 O→2KAlSi 2 O 6 +2HCl；
Al 2 O 3 ·2SiO 2 +2KOH+2SiO 2 →2KAlSi 2 O 6 +H 2 O；
Al 2 O 3 ·2SiO 2 +K 2 SO 4 +2SiO 2 →2KAlSi 2 O 6 +SO 3 ；
Al 2 O 3 ·2SiO 2 +K 2 O+2SiO 2 →2KAlSi 2 O 6 。
KAlSi 2 O 6 The melting point of the potassium silicate is up to 1500 ℃, so that the concentration of corrosive substances such as potassium chloride, potassium sulfate and the like in gas state is reduced, the formation of potassium silicate with low melting point is inhibited, and the slagging phenomenon caused by potassium element is reduced or even eliminated.
In another embodiment, the catalyst is selected from one or more of isopropyl titanate, titanium sol, and barium carbonate.
Specifically, the catalyst mainly adopts isopropyl titanate, titanium sol or barium carbonate and the like, and the isopropyl titanate, the titanium sol or the barium carbonate and the like mainly play a role of the catalyst in the household garbage incineration and can accelerate the oxidation combustion rate of the coke blocks.
In another embodiment, the combustion improver is selected from one or more of copper nitrate, manganese nitrate, copper sulfate, potassium permanganate and potassium nitrate.
Specifically, the combustion improver mainly adopts one or two of cupric nitrate, manganese nitrate, copper sulfate, potassium permanganate and potassium nitrate, and the combustion improver mainly plays a role in oxidation combustion supporting in household garbage incineration. The phenomenon of dust deposition and slag bonding formed on the internal heating surface of the household garbage incinerator belongs to high-temperature sintering dust with strong caking property. Potassium nitrate decomposes at high temperature to produce oxides such as potassium oxide. Oxide of potassium furtherStep and SO in flue gas 2 、CO 2 、SiO 2 And so on, while a portion is also absorbed by the molten silicate particles.
2KNO 3 +SiO 2 →K 2 SiO 3 +N 2 O 3 ；
K 2 CO 3 +SiO 2 →K 2 SiO 3 +CO 2 ；
K 2 CO 3 +K 2 S 2 O 7 →2K 2 SO 4 +CO 2 ；
K 2 O+SiO 2 →K 2 SiO 3 ；
K 2 O+K2S2O 7 →2K 2 SO 4 。
It should be noted that the addition of the decoking agent reacts in the deposited layer to release a large amount of gas, so that the deposited layer becomes loose. Meanwhile, nitrate ions are decomposed at high temperature and can be slightly exploded in the coking body, so that the inside of the coking body is loosened and falls off. The purified potassium sulfate is easy to pulverize, the bonding degree in the coke body is reduced, and the adhesive capacity of the coke body is weakened.
On one hand, copper nitrate can be used as an oxidation type combustion improver, and on the other hand, copper ions in the copper nitrate can play a combustion-supporting role. The existence of copper ions reduces the activation energy of coke in the household garbage during combustion reaction, so that the combustion reaction is intensified, and the effect of improving the combustion is achieved. According to the oxygen transfer theory, the combustion-supporting effect of the copper ions can be effectively explained.
2CuO+C→2Cu+CO 2 ；
2Cu+O 2 →2CuO。
The copper oxide will undergo a redox reaction with the coke in the domestic waste and will subsequently be present as copper in a reduced state. And oxygen molecules in the air are easier to combine with the metal in a low valence state, so that the diffusion resistance of oxygen to the surface of the coke is reduced. While the copper element with low valence state can be combined with a carbon structure through ionic bonds and the like, adsorb oxygen molecules, oxidize into copper oxide again, and then be reduced by the incandescent coke at high temperature. Therefore, the combustion improver copper element is in a reduction-oxidation cycle under high-temperature combustion and serves as an intermediate of oxygen and coke, so that the diffusion resistance of the oxygen is reduced, the combustion of the coke is accelerated, and the combustion-supporting effect is achieved. Meanwhile, the generated carbon dioxide enables the coking body to become loose and porous, and the coking body is easy to fall off from the heating surface, so that the effect of removing ash deposition is achieved. Potassium permanganate and manganese nitrate act similarly to copper nitrate.
In another embodiment, the corrosion inhibitor is selected from one or more of aluminum sulfate, ammonium phosphate, diammonium phosphate, phosphoric acid, and sulfuric acid.
Specifically, the corrosion inhibitor mainly adopts one or two of aluminum sulfate, ammonium phosphate, diammonium hydrogen phosphate, phosphoric acid and sulfuric acid, and the corrosion inhibitor can react with high-volatility alkali metals such as Na and K to generate stable sodium phosphate, sodium sulfate, potassium phosphate and potassium sulfate, so that the alkali metals are effectively solidified, and further, the volatilization corrosion heat exchange surface of the alkali metals is inhibited.
In another embodiment, the sintering-resistant agent is selected from one or more of zirconium nitrate, boric acid and borax.
Specifically, the anti-sintering agent mainly adopts one or two of zirconium nitrate, boric acid and borax. Na such as borax + As an electron acceptor, with mullite (3 Al) 2 O 3 ·2SiO 2 ) The oxygen atoms with higher electronegativity combine to form new chemical bond, destroy original lattice structure in the deposition layer, change its chemical properties, and form new substance nepheline (Na) 2 O·Al 2 O 3 ·2SiO 2 ). Compared with the original mullite, the melting point of nepheline is lower. Therefore, the adhesive type is strong, the viscosity of the clinker is reduced by adding the borax, the flowing degree of the clinker is increased, and the adhesion capability of the clinker is weakened.
The second aspect of the present application provides a preparation method of the composite decoking agent, comprising the following steps:
weighing water, a flux inhibitor, a catalyst, a combustion improver, a corrosion inhibitor and an anti-sintering agent according to the mass fraction of the composite decoking agent, and mixing and dissolving the water, the flux inhibitor, the catalyst, the combustion improver, the corrosion inhibitor and the anti-sintering agent to obtain the composite decoking agent.
The application provides a compound decoking agent is mainly applied to domestic waste incinerator, possesses multi-functional characteristics such as deashing, decoking, combustion-supporting and corrosion protection. The product is in a liquid form, is conveniently sprayed into the garbage incinerator through the observation hole by the liquid pump, can effectively ensure the full mixing of different components and fuel, and fully exerts the function of the decoking agent. The application amount of the decoking agent is estimated to be one thousandth of the garbage treatment amount preliminarily, and the decoking agent is introduced into a high-temperature area of a hearth through a liquid pump, so that the condition of ash deposition and coking on the heating surface of the incinerator can be effectively improved. The components in the decoking agent can react with ash to improve ash melting point and inhibit the occurrence of ash deposition, coking and corrosion, and has the functions of loosening and falling formed coking bodies and supporting combustion. Therefore, the heat transfer efficiency of the incinerator can be effectively improved, the exhaust gas temperature is reduced, the service life of an incineration boiler system is prolonged, energy is saved, the efficiency is increased, and the operation cost is reduced.
Detailed Description
The application provides a compound decoking agent to domestic waste incineration boiler for solve among the prior art most decoking agents and be not applicable to domestic waste incinerator, can not solve domestic waste boiler and produce the technical defect of slagging scorification at the incineration in-process.
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The raw materials and reagents used in the following examples are commercially available or self-made.
The titanium sol used in the following examples was a titanium dioxide sol purchased from Qingdao maritime industry Co., Ltd.
The preparation process of the composite decoking agent comprises the following steps:
1. weighing water and the required fusing inhibitor, catalyst, combustion improver, corrosion inhibitor and anti-sintering agent according to the mass fraction of the composite decoking agent, and putting the weighed chemical agents into the aqueous solution.
2. The aqueous solution was stirred until all the agent was dissolved.
3. And packaging and warehousing the coke-removing liquid after the coke-removing liquid is qualified through inspection.
Example 1
The embodiment of the application provides a formula of a composite decoking agent, wherein a flux inhibitor: the mass ratio of the combustion improver is 10:1. Firstly, 10kg of aluminum nitrate, 10kg of magnesium nitrate, 0.5kg of isopropyl titanate, 2kg of copper nitrate, 2kg of aluminum sulfate and 3kg of boric acid are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 450kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 130mm to 7mm, and the corrosion thickness of the superheater pipe wall is reduced from 1.2mm to 0.10 mm.
Example 2
The embodiment of the application provides a formula of a composite decoking agent, wherein a flux inhibitor: the mass ratio of the combustion improver is 10: 1.2. Firstly, 12kg of aluminum nitrate, 8kg of magnesium nitrate, 1kg of barium carbonate, 2.4kg of copper nitrate, 2kg of ammonium phosphate and 3kg of borax are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 450kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 110mm to 5mm, and the corrosion thickness of the superheater pipe wall is reduced from 1.7mm to 0.09 mm.
Example 3
The embodiment of the application provides a formula of a composite decoking agent, wherein a flux inhibitor: the mass ratio of the combustion improver is 10: 1.5. Firstly, 8kg of aluminum nitrate, 12kg of calcium nitrate, 0.5kg of titanium sol, 3kg of manganese nitrate, 2kg of diammonium hydrogen phosphate, 1.5kg of borax and 0.5kg of zirconium nitrate are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 500kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 140mm to 4mm, and the corrosion thickness of the superheater tube wall is reduced from 1.9mm to 0.05 mm.
Example 4
The embodiment of the application provides a formula of a composite decoking agent, wherein a fusing inhibitor: the mass ratio of the combustion improver is 10: 1.3. Firstly, 10kg of aluminum nitrate, 10kg of magnesium nitrate, 0.5kg of isopropyl titanate, 2.6kg of copper nitrate, 2kg of ammonium phosphate and 3kg of boric acid are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 500kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 180mm to 11mm, and the corrosion thickness of the superheater pipe wall is reduced from 2.2mm to 0.09 mm.
Example 5
The embodiment of the application provides a formula of a composite decoking agent, wherein a flux inhibitor: the mass ratio of the combustion improver is 10: 1.5. Firstly, 10kg of aluminum nitrate, 5kg of magnesium nitrate, 5kg of calcium nitrate, 0.5kg of barium carbonate, 2kg of copper nitrate, 1kg of potassium permanganate, 2kg of ammonium phosphate and 3kg of borax are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 450kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 105mm to 12mm, and the corrosion thickness of the superheater tube wall is reduced from 1.6mm to 0.13 mm.
Comparative example 1
The comparative example of the application provides a formula of a decoking solution, wherein the weight ratio of the fusing inhibitor: the mass ratio of the combustion improver is 10: 0.5. Firstly, 10kg of aluminum nitrate, 5kg of magnesium nitrate, 5kg of calcium nitrate, 0.5kg of barium carbonate, 0.5kg of copper nitrate, 0.5kg of potassium permanganate, 2kg of ammonium phosphate and 3kg of borax are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 450kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 110mm to 108mm, and the corrosion thickness of the superheater pipe wall is reduced from 1.8mm to 0.85 mm.
Comparative example 2
The comparative example of the application provides a formula of a decoking solution, wherein the weight ratio of the fusing inhibitor: the mass ratio of the combustion improver is 10: 2. Firstly, 10kg of aluminum nitrate, 10kg of magnesium nitrate, 0.5kg of isopropyl titanate, 4kg of copper nitrate, 2kg of aluminum sulfate and 3kg of boric acid are put into 200kg of water. And stirring the solution until the added chemical reagent is completely dissolved to obtain a decoking solution product. After 450kg of decoking liquid is applied to a household garbage incinerator, the coking thickness is reduced from 127mm to 119mm, and the corrosion thickness of the superheater pipe wall is reduced from 1.3mm to 0.76 mm.
From the above examples and comparative examples, when the flux inhibitor: when the mass ratio of the combustion improver is more than or less than 10 (1-1.5) in the range, the obtained composite decoking agent has poor decoking effect, and the slag bonding phenomenon of the household garbage in the combustion process cannot be slowed down and avoided.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (7)
1. The composite decoking agent for the household garbage incineration boiler is characterized by comprising the following components in percentage by mass;
wherein, the fusing inhibitor: the mass ratio of the combustion improver is 10 (1-1.5).
2. The composite decoking agent of claim 1, wherein the fluxing agent is selected from one or more of calcium nitrate, aluminum nitrate and magnesium nitrate.
3. The composite decoking agent of claim 1, wherein the catalyst is selected from one or more of isopropyl titanate, titanium sol and barium carbonate.
4. The composite decoking agent of claim 1, wherein the combustion improver is selected from one or more of copper nitrate, manganese nitrate, copper sulfate, potassium permanganate and potassium nitrate.
5. The composite decoking agent of claim 1, wherein the corrosion inhibitor is selected from one or more of aluminum sulfate, ammonium phosphate, diammonium phosphate, phosphoric acid and sulfuric acid.
6. The composite decoking agent of claim 1, wherein the anti-sintering agent is selected from one or more of zirconium nitrate, boric acid and borax.
7. The preparation method of the composite decoking agent of any one of claims 1 to 6, characterized by comprising the following steps:
weighing water, a flux inhibitor, a catalyst, a combustion improver, a corrosion inhibitor and an anti-sintering agent according to the mass fraction of the composite decoking agent of claim 1, and mixing and dissolving the water, the flux inhibitor, the catalyst, the combustion improver, the corrosion inhibitor and the anti-sintering agent to obtain the composite decoking agent.
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| CN103252162A (en) * | 2013-05-10 | 2013-08-21 | 山东大学 | Method for removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate |
| EP3325581A1 (en) * | 2015-07-23 | 2018-05-30 | Uniwersytet Jagiellonski | Ecological solid fuel additive, reducing soot formation |
| CN110699150A (en) * | 2019-10-28 | 2020-01-17 | 山东亿维新材料有限责任公司 | Environment-friendly decoking agent and preparation method thereof |
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