CN104327903A - Fire coal additive for controlling alkali metal release and preparation method of fire coal additive - Google Patents
Fire coal additive for controlling alkali metal release and preparation method of fire coal additive Download PDFInfo
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- CN104327903A CN104327903A CN201410578028.3A CN201410578028A CN104327903A CN 104327903 A CN104327903 A CN 104327903A CN 201410578028 A CN201410578028 A CN 201410578028A CN 104327903 A CN104327903 A CN 104327903A
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Abstract
The invention discloses a fire coal additive for controlling alkali metal release and a preparation method of the fire coal additive. The additive is prepared by grinding and mixing the following raw materials in parts by weight: 40-50 parts of kaolin, 30-40 parts of sillimanite, 5-10 parts of bauxite and 15-30 parts of quartz. Release of an alkali metal compound in the pulverized coal combustion process can be effectively controlled by use of the fire coal additive, so that the problems such as soot formation, scorification, wall corrosion and the like of a boiler are reduced, the heat transfer efficiency of the boiler can be improved, the service life of the boiler is prolonged, the production cost is reduced and the economic benefits are improved. In addition, the discharge amount of submicron particulate matters is also reduced by reduction of a gaseous alkali metal compound, the serious environmental problem at present is relieved, the additive is simple in formula, stable in ingredient, innocuous, unpoisonous and easy to store, and various mineral substances are wide in source, cheap and easy to get.
Description
Technical field
The invention belongs to Coal Clean field of combustion technology, relate more specifically to a kind of additive for fire coal and preparation method thereof controlling basic metal release.
Background technology
Many coals, energy structure feature that is oil-poor, weak breath determine coal within for some time in future, are still the topmost energy support of China.Thermal power plant uses coal rich and influential family beyond doubt, and according to relevant regulations, the steam coal of the industries such as electric power is low-rank coal, and in coal combustion process, a large amount of alkali metal compound wherein contained can evaporate.The vapour of an alkali metal discharged can deposit on boiler convection current tube wall, causes serious dust stratification; Alkali metal compound also can form compound or the eutectic of low melting point with other ash-forming material (as silicon-dioxide, calcium oxide), is bonded on boiler heat exchange face, forms large-area slagging scorification.This can cause boiler heat-transfer decrease in efficiency, localized hyperthermia's booster, causes unplanned parking maintenance, substantially reduces the work-ing life of boiler, adds production cost, reduces the economic benefit of enterprise.In addition, in integrated gasification combined cycle for power generation (IGCC) system or other Clean Coal Power Generating Technologies, the vapour of an alkali metal in high-temperature flue gas can cause the heavy corrosion of blade of gas turbine, greatly have impact on the utilising efficiency of equipment.And, alkali metal compound is often enriched in less (submicron order) particulate matter, these particulate matter can not trap by collection ash system and be released in atmospheric environment, cause serious environmental pollution (as haze), huge threat formed to the physical and mental health of people.Therefore, the control realizing discharging alkali metal compound in pulverized coal friring process is a problem demanding prompt solution.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of additive for fire coal and preparation method thereof controlling basic metal release, overcome in prior art problems such as using the serious dust stratification of boiler that in high basic metal content coal process, alkali-metal release causes, slagging scorification, heat-transfer surface corrosion and environmental pollution.
Technical scheme of the present invention is: a kind of additive for fire coal controlling basic metal release, and this additive is formed by the proportioning raw materials of following weight part:
Preferably, this additive is formed by the proportioning raw materials of following weight part: kaolin 50 parts, sillimanite 30 parts, bauxitic clay 5 parts, 15 parts, quartz.
Control a preparation method for the additive for fire coal of basic metal release, first, get kaolin 40-50 part, sillimanite 30-40 part, bauxitic clay 5-10 part, quartzy 15-30 part; Secondly, these raw materials are dropped in pulverizing mill respectively and pulverizes, and be ground to 300 mesh sieves; Finally, the powder mixing after grinding is added in stirrer and stirs, obtain the additive for fire coal controlling basic metal release.
The mechanism of action that the present invention controls the additive for fire coal of basic metal release is: in coal combustion process, the existing forms of the alkali metal compound in coal roughly has two kinds: a kind of is the basic metal be present in hydrated ion form and organic form in coal, can volatilize in combustion and discharge, be present in the form of a vapor in high-temperature flue gas, the corrosion of this part alkali metal compound to the slagging scorification of boiler, dust stratification and heat-transfer surface has a significant impact; Another part basic metal is present in matrix of coal with the form of silico-aluminate, and this part basic metal can not discharge, and enters in lime-ash in solid form and discharge out of the furnace, thus less to the harm of boiler.The main component of additive for fire coal of the present invention is the mineral substance containing aluminium, Si oxide, the rational proportion of different minerals matter contributes to it and chemically adsorbs the dystectic alkali-metal aluminosilicate of vapour of an alkali metal generation in combustion, alkali metal compound is entered in lime-ash and discharges out of the furnace thereupon.Like this, in combustion processes, alkali-metal quantity discharged just obtains effective control, reduces the content of gaseous alkali metal compound, and then decreases dust stratification and clogging problems, and decreases the discharge of fine particle.
The invention has the beneficial effects as follows: the use of additive for fire coal of the present invention effectively can control the release of alkali metal compound in pulverized coal friring process, and then reduce the problems such as the dust stratification of boiler, slagging scorification and wall corrosion, the heat transfer efficiency of boiler can be improved, prolonged boiler work-ing life, reduce production cost, increase economic efficiency.In addition, the minimizing of gaseous alkali metal compound also can reduce the quantity discharged of submicron particles, contributes to extenuating environmental problem severe at present.The formula of this additive is simple, and stable components is nontoxic, is easy to store, and the equal wide material sources of each mineral substance, are cheaply easy to get.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1: the control basic metal release additive for fire coal of the present embodiment is made up of the proportioning raw materials of following weight part: kaolin 45 parts, sillimanite 30 parts, bauxitic clay 10 parts, 15 parts, quartz.
The preparation method of the present embodiment additive is: kaolin, sillimanite, bauxitic clay, these raw materials of quartz are dropped in pulverizing mill respectively and pulverized, and be ground to 300 mesh sieves, then the powder mixing after grinding is added in stirrer and stir, obtain the additive for fire coal controlling basic metal release.
Embodiment 2: the control basic metal release additive for fire coal of the present embodiment is made up of the proportioning raw materials of following weight part: kaolin 45 parts, sillimanite 35 parts, bauxitic clay 5 parts, 15 parts, quartz.
The preparation method of the present embodiment additive is identical with embodiment 1.
Embodiment 3: the control basic metal release additive for fire coal of the present embodiment is made up of the proportioning raw materials of following weight part: kaolin 50 parts, sillimanite 30 parts, bauxitic clay 5 parts, 15 parts, quartz.
The preparation method of the present embodiment additive is identical with embodiment 1.
Embodiment 4: the control basic metal release additive for fire coal of the present embodiment is made up of the proportioning raw materials of following weight part: kaolin 40 parts, sillimanite 35 parts, bauxitic clay 5 parts, 20 parts, quartz.
The preparation method of the present embodiment additive is identical with embodiment 1.
Embodiment 5: the control basic metal release additive for fire coal of the present embodiment is made up of the proportioning raw materials of following weight part: kaolin 50 parts, sillimanite 40 parts, bauxitic clay 10 parts, 30 parts, quartz.
The preparation method of the present embodiment additive is identical with embodiment 1.
The using method that the present invention controls the additive for fire coal of basic metal release is: add burner hearth combustion after being mixed with coal dust in advance by additive or sprayed into according to a certain percentage in coal-powder boiler by additive.The addition that the present invention controls the additive for fire coal of basic metal release need be determined according to the alkali metal content in coal ash content and ash.
Above 5 embodiments remove efficiency for basic metal during Hami coal combustion and are:
| Operating mode | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Basic metal removes efficiency (%) | 70.32 | 71.24 | 73.59 | 68.77 | 72.64 |
As can be seen from form, alkali-metal release when additive for fire coal of the present invention effectively can control pulverized coal friring, the alkali-metal efficiency that removes can reach 70%, so just considerably reduce caused by alkali steam dust stratification, slagging scorification and heat-transfer surface etching problem, the utilising efficiency of raising equipment, the prolonged boiler life-span.
The foregoing is only preferred embodiment of the present invention, is not do any restriction to the present invention, and every essence according to the present invention is made any simple amendment, equivalent replaced or improve, and all still belongs within scope that the present invention protects.
Claims (3)
1. control an additive for fire coal for basic metal release, it is characterized in that, this additive is formed by the proportioning raw materials of following weight part:
Kaolin: 40 – 50 parts
Sillimanite: 30 – 40 parts
Bauxitic clay: 5 – 10 parts
Quartz: 15 – 30 parts.
2. control the additive for fire coal of basic metal release according to claim 1, it is characterized in that: this additive is formed by the proportioning raw materials of following weight part: kaolin 50 parts, sillimanite 30 parts, bauxitic clay 5 parts, 15 parts, quartz.
3. control a preparation method for the additive for fire coal of basic metal release, it is characterized in that: first, get kaolin, sillimanite, bauxitic clay, quartz respectively by the proportioning raw materials of claim 1; Secondly, these raw materials are dropped in pulverizing mill respectively and pulverizes, and be ground to 300 mesh sieves; Finally, the powder mixing after grinding is added in stirrer and stirs, obtain the additive for fire coal controlling basic metal release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578028.3A CN104327903A (en) | 2014-10-24 | 2014-10-24 | Fire coal additive for controlling alkali metal release and preparation method of fire coal additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578028.3A CN104327903A (en) | 2014-10-24 | 2014-10-24 | Fire coal additive for controlling alkali metal release and preparation method of fire coal additive |
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| CN104327903A true CN104327903A (en) | 2015-02-04 |
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| CN201410578028.3A Pending CN104327903A (en) | 2014-10-24 | 2014-10-24 | Fire coal additive for controlling alkali metal release and preparation method of fire coal additive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112122A (en) * | 2015-09-24 | 2015-12-02 | 东南大学 | Biomass combustion coal additive effective in controlling release of alkali metals |
| CN107177397A (en) * | 2017-06-13 | 2017-09-19 | 浙江大学 | A kind of effective additive and its application process for suppressing accurate eastern coal slagging contamination |
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| CN102786998A (en) * | 2012-07-24 | 2012-11-21 | 周丽琴 | Boiler coke preventing and eliminating agent |
| CN103013617A (en) * | 2013-01-08 | 2013-04-03 | 华北电力大学 | Industrial residue boiler anti-coking agent and application method thereof |
| CN103627468A (en) * | 2013-07-31 | 2014-03-12 | 陈方 | Novel decoking agent for fire coal |
| CN104114681A (en) * | 2011-12-21 | 2014-10-22 | 肯塔基州-田纳西州粘土公司 | Mineral additive blend compositions and methods for operating combustors for avoiding problems such as agglomeration, deposition, corrosion and reducing emissions |
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2014
- 2014-10-24 CN CN201410578028.3A patent/CN104327903A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104114681A (en) * | 2011-12-21 | 2014-10-22 | 肯塔基州-田纳西州粘土公司 | Mineral additive blend compositions and methods for operating combustors for avoiding problems such as agglomeration, deposition, corrosion and reducing emissions |
| CN102786998A (en) * | 2012-07-24 | 2012-11-21 | 周丽琴 | Boiler coke preventing and eliminating agent |
| CN103013617A (en) * | 2013-01-08 | 2013-04-03 | 华北电力大学 | Industrial residue boiler anti-coking agent and application method thereof |
| CN103627468A (en) * | 2013-07-31 | 2014-03-12 | 陈方 | Novel decoking agent for fire coal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112122A (en) * | 2015-09-24 | 2015-12-02 | 东南大学 | Biomass combustion coal additive effective in controlling release of alkali metals |
| CN107177397A (en) * | 2017-06-13 | 2017-09-19 | 浙江大学 | A kind of effective additive and its application process for suppressing accurate eastern coal slagging contamination |
| CN107177397B (en) * | 2017-06-13 | 2019-11-22 | 浙江大学 | A kind of effective additive and its application method for inhibiting quasi- eastern coal slagging to stain |
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Application publication date: 20150204 |