CN106520254A - Fluxing agent capable of reducing melting point of coal ash and improving viscosity-temperature characteristic of coal, and application thereof - Google Patents
Fluxing agent capable of reducing melting point of coal ash and improving viscosity-temperature characteristic of coal, and application thereof Download PDFInfo
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- CN106520254A CN106520254A CN201611058190.8A CN201611058190A CN106520254A CN 106520254 A CN106520254 A CN 106520254A CN 201611058190 A CN201611058190 A CN 201611058190A CN 106520254 A CN106520254 A CN 106520254A
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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
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a fluxing agent capable of reducing the melting point of coal ash and improving the viscosity-temperature characteristic of coal, and application thereof, belonging to the field of coal gasification technology. The fluxing agent capable of reducing the melting point of coal ash and improving the viscosity-temperature characteristic of coal is composed of clay and quick lime, wherein the clay contains, by weight, 58.55 to 63% of SiO2 and 8.5 to 12.5% of CaO, and the quick lime contains, by weight, more than 91% of CaO. According to the invention, clay and quick lime are used as the composite fluxing agent, so the raw materials are widely available and cost and energy consumption are low; and the fluxing agent can effectively reduce the melting point of coal ash and improve the viscosity-temperature characteristic of coal.
Description
Technical field
The present invention is belonging to Coal Gasification Technology field, is related to a kind of flux for reducing coal ash fusion temperature and improving viscosity-temperature characteristic
And its application.
Background technology
Equipment maximizes, product becomes more meticulous, the developing direction that cascaded utilization of energy, energy-saving and emission-reduction are domestic coal gasifications.Greatly
Type entrained flow gasification is current main flow gasification technology and development trend, and its slag tap has to the ash fusion point and melting characteristic of coal
Certain requirement.During 12, " maximum " of national Coal Gasification Technology is refreshed again and again, and first first set is continued to bring out, GE
Stove, shell stove, Tsing-Hua University's stove, space flight stove, lurgi gasifier, GSP stoves, section's woods coal gasification, multi-nozzle opposition gasifier etc. are new
Pressurized gasification technology range of application constantly expands, and this also plays important function, coal for gasification to Chinese feed coal structural adjustment
Scope is wider.
The coal characteristics of different geographical are different, select to be adapted to the Coal Gasification Technology of locality coal, are Developing Coal Chemical Industrys
The deciding factor of success.
Under this development trend, there are the three-hypers of " high ash, high-sulfur, the high ash melting point " of certain exploitation scale inferior for Shanxi
Coal is carried out screening, is studied.According to investigations, Shanxi high-sulfur, high ash low-quality coal resource account for the 25% or so of the whole province's coal resources total amount.
As this part coal sulfur content is high, limited by environmental protection policy and Technological Economy, which is applied to dynamic power can only be few as coal blending
Amount addition；As its ash fusion point is high, limited by prior art, it is difficult to trans-utilization, its market value is relatively low, high-ash-fusion coal
Gasification is still a difficult problem.
The viscosity-temperature characteristic of Coal ash slag reflects the relation of Coal ash slag viscosity and temperature under high temperature, is quantitative under high temperature
The most important parameters of description Coal ash slag mobility, and the important evidence for determining slag tap gasifier operation temperature.Together
When, if the viscosity of Coal ash slag varies with temperature too sensitive, the requirement to gasification operation temperature is harsher, gasifies operable
Temperature range narrows, and is not easy to operation.
The drop coal low ash smelting point method conventional with the viscosity-temperature characteristics for improving coal is mainly coal blending and addition flux at present, often
Flux is mainly limestone and quartz sand.Specifically：Coal blending is to be constituted to select with complementary coal according to coal ash
Sample carries out mixture；Limestone mainly consists of Calcium Carbonate, is the most frequently used flux of iron and steel, glass and chemical industry, actually makes
With during, can be constituted according to practical operation temperature and coal ash, the addition of limestone, mountain be determined using various forecast models
West saves ature of coal ash fusion point height, and its sial content is high, and lime-ash major part belongs to crystallization slag, adds limestone and is only capable of reducing the ash of coal
Fusing point, the viscosity-temperature characteristics of coal are poor, and the cosolvents for needing addition two or more could reduce the ash fusion point of coal and improve the viscous temperature of coal
Characteristic, and the addition of limestone is unsuitable excessive, characteristic melting temperature and viscosity occur increase trend, and excessive CaO is not only
Can cause slag in temperature-fall period rapid crystallization and separate out solid, also result in flying dust deposition and gasify the efficiency of furnace decline etc. ask
Topic；Quartz sand belongs to nonmetallic mineral, is a kind of silicate mineral of hard, wear-resisting, stable chemical performance, its main mineral constituent
It is SiO2, the chemical composition of common quartz sand is SiO2>=90%, Fe2O3≤ 0.06%, its fusing point adds SiO more than 1750 DEG C2
Purpose be to realize regulation and control to critical viscosity temperature, generally in the case of S/A ＜ 2.5, critical adhesion by adjusting silica alumina ratio
Degree temperature is reduced with the increase of silica alumina ratio, and viscosity-temperature curve type switchs to glass dregs by slag is crystallized, and the ash that can reduce coal melts
The viscosity-temperature characteristics of coal are put and improve, as the hardness of quartz sand is 7, as cosolvent only in laboratory applications in reduction coal
Ash fusion point, current industrialization are also difficult to find that energy long period, and stable operation is ground into less than 100 μm of equipment.
In order to solve the drawbacks described above of prior art presence, the present invention have developed a kind of reduction coal ash fusion temperature and improve coal
The flux of viscosity-temperature characteristic.
The content of the invention
It is an object of the invention to provide a kind of flux for reducing coal ash fusion temperature and improving the viscosity-temperature characteristic of coal.
It is a further object to provide above-mentioned reduction coal ash fusion temperature and the flux of the viscosity-temperature characteristic for improving coal
Using.
The present invention is achieved by the following technical solutions：
A kind of flux for reducing coal ash fusion temperature and improving the viscosity-temperature characteristic of coal, described flux are clay and quick lime.
Further, the SiO containing 58.55-63 wt% in described clay2, the CaO of 8.5-12.5wt%, described calculogenesis
CaO of the ash containing >=91wt%.
Further, the application of the flux for reducing coal ash fusion temperature and improving the viscosity-temperature characteristic of coal, is in raw coal
The clay of middle addition raw coal quality 1.5-2.5%, the quick lime of 1.5-2.5%.
Described application, be in raw coal add raw coal quality 2% clay, 2% quick lime.
SiO in clay2Content be 60% or so, and containing higher CaO, realized to critical by adjusting silica alumina ratio
The regulation and control of viscosity temperature, critical viscosity temperature are reduced with the increase of silica alumina ratio, can be reduced the ash fusion point of coal and be improved the viscous of coal
Temperature characteristics；Result of study shows that clay is as a kind of natural composite fluxing agent, wider than limestone and quartz sand source
General, cost of material is cheap, and industrial applications to grind energy consumption low, it is more more economical than limestone and quartz sand application.In quick lime
CaO is higher, and, more than 90%, used as flux, effect of fluxing is obvious for present invention quick lime preferably >=91% for one kind.
, using clay and quick lime as composite fluxing agent, extensively, cost and energy consumption are low, can be effective for raw material sources for the present invention
Reduce coal ash fusion temperature and improve the viscosity-temperature characteristic of coal.
Description of the drawings
Fig. 1 is the result figures of the coal ash FT with the change of clay addition of 3 raw coal of embodiment；
Fig. 2 is the result figures of the coal ash FT with the change of clay addition of 4 raw coal of embodiment.
Specific embodiment
The invention will be further described with reference to embodiments.
Analysis test after 1 coal sample of embodiment, flux and raw coal addition flux
Coal analysis：Including Industrial Analysis, ash fusion point, caloric value, ash component analysis, the analysis of 3 kinds of flux ash components.Three kinds
Flux refers to clay, quick lime, quartz sand, and analytical data see the table below：
1 raw coal coal analysis of table
Show from 1 analysis result of table, Liang Du, adopted Chinese bush cherry, Gaoyang raw coal ash melt-flow temperature are all higher than 1500 DEG C, are to meet gas
Requirement of the fluidized gas producer to as-fired coal ash fluid point simultaneously improves gasification economy, has carried out in raw coal being properly added fluxing
Agent reduces the test of the flowing temperature of as-fired coal.
2 flux analytical table of table
Clay component analyses are as follows：SiO2Between 58.5-63%, CaO is between 8.5-12.5%.
Embodiment 2 is with quick lime as flux
With limestone as flux, raw coal is made an addition to（Two cross coal）In, wherein addition is respectively 2%, 3%, the 4% of raw coal quality,
Its result is as shown in table 3,
Table 3 adds limestone coal ash melting temperature
From table 3 it can be seen that when addition is 4%, coal ash melt-flow temperature is reduced to 1389 DEG C, and effect of fluxing is obvious.
When raw coal coal ash silica alumina ratio is relatively low, coal ash often shows the characteristic for crystallizing slag, is unfavorable for that water-cooling wall gasifies
The dross and slag tap of stove, the flowing for industrially often taking the addition silicon dioxide i.e. mode of quartz sand to improve coal ash are special
Property, and quartz sand hardness is bigger, grindability is poor, therefore takes addition clay to improve the mobility of coal ash.
Embodiment 3 is with clay as flux
With clay as flux, raw coal is made an addition to（Two cross coal）In, wherein addition be respectively raw coal quality 2%, 4%, 6%,
8%th, 10, its result is as shown in table 4,
Coal ash melting temperature after the addition clay of table 4
The coal ash FT of raw coal is with the result of the change of clay addition as shown in figure 1, can be seen that clay from table 4 and Fig. 1
Addition can significantly improve coal ash, but such as meet requirement of the coal ash flowing temperature less than 1400 DEG C, flux addition
Amount is more.
Embodiment 4 is using clay and quick lime as composite fluxing agent
Using clay and quick lime as composite fluxing agent, raw coal is made an addition to（Two cross coal）In, wherein clay addition is 2%, calculogenesis
Grey addition is respectively 0%, 1%, 2%, 3%, the 4% of raw coal quality, and its result is as shown in table 5,
Table 5 adds 2% clay and different proportion quick lime coal ash melting temperature
The coal ash FT of raw coal is with the result of the change of clay addition as shown in Fig. 2 can be seen that addition from table 5 and Fig. 2
After 2% clay and quick lime, its ash fusion point changes clearly, when addition is 1%, coal ash flowing temperature FT i.e. from
1476 DEG C are reduced to 1386 DEG C, and as stone addition increases to 2%, coal ash flowing temperature continues to reduce, and in addition is
When 3%, coal ash flowing temperature has and rises by a small margin.
Gaoyang coal, adopted Chinese bush cherry coal are added by clay and add quick lime again after addition clay and is analyzed, be as a result similar to.
The analysis result of flux is added according to raw coal and raw coal, viscosity-temperature characteristic test has been carried out to coal sample, as a result as shown in table 6,
The glutinous temperature data of+2% quick lime of 6 2% clay of table
As can be seen from Table 6, its viscosity-temperature characteristics is close to crystal slag.
The viscosity-temperature characteristics canonical parameter of 5 several raw coal of embodiment addition flux is as follows：
7 viscosity-temperature characteristic canonical parameter of table
Note：(1) η CV critical viscosities；TCV critical viscosity temperature；When T2 viscosity reaches 2Pa s
Temperature (is calculated)；Temperature when T25 viscosity reaches 25Pa s；(2) consider the length of SE gasification furnaces
Cycle safe operation, SE gasification furnaces maximum allowable operating temperature (M.A.O.T.) are 1600 DEG C.(3) minimum operation
Temperature takes the big value of Tcv+50 DEG C and T25 one of both.
It has been generally acknowledged that 2 ~ 25Pa s are suitable deslagging viscosity, while operation temperature need to be away from the critical viscosity temperature of coal ash
Degree.From table 7, two cross coal addition flux after (+2% quick lime of 2% clay) suitable gasification operation temperature it is relatively low
And operating range is larger, it is the minimum raw material of operating cost and operational risk.After the coal addition flux of Gaoyang, (2% clay+2% is given birth to
Calx), its suitable gasification operation temperature crosses about 40 DEG C of coal higher than two, and lower bound operation furnace temperature is 1434 DEG C, by appropriate high temperature
Operation can meet long-term operation requirement.
Claims (4)
1. it is a kind of to reduce coal ash fusion temperature and improve the flux of viscosity-temperature characteristic, it is characterised in that described flux be clay and
Quick lime.
2. it is according to claim 1 to reduce coal ash fusion temperature and improve the flux of viscosity-temperature characteristic, it is characterised in that described
SiO containing 58.55-63 wt% in clay2, the CaO of 8.5-12.5wt%, the CaO of described quick lime containing >=91wt%.
3. the application for reducing coal ash fusion temperature with the flux for improving viscosity-temperature characteristic described in claim 1 or 2, it is characterised in that
Be in raw coal add raw coal quality 1.5-2.5% clay, the quick lime of 1.5-2.5%.
4. application according to claim 3, it is characterised in that be the clay for adding raw coal quality 2% in raw coal, 2%
Quick lime.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611058190.8A CN106520254A (en) | 2016-11-27 | 2016-11-27 | Fluxing agent capable of reducing melting point of coal ash and improving viscosity-temperature characteristic of coal, and application thereof |
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| CN201611058190.8A CN106520254A (en) | 2016-11-27 | 2016-11-27 | Fluxing agent capable of reducing melting point of coal ash and improving viscosity-temperature characteristic of coal, and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923014A (en) * | 2019-10-28 | 2020-03-27 | 中国寰球工程有限公司 | Fluxing agent for adjusting melting characteristic of high-sulfur petroleum coke gasification ash and application thereof |
Citations (6)
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| US4057398A (en) * | 1976-02-24 | 1977-11-08 | Apollo Chemical Corporation | Process for reducing the fusion point of coal ash |
| JPS63130698A (en) * | 1986-11-21 | 1988-06-02 | Idemitsu Kosan Co Ltd | Melting point depressant for coal ash |
| CN101580751A (en) * | 2009-06-24 | 2009-11-18 | 淮南师范学院 | Fusing assistant for lowering coal ash fusion temperature and preparation method thereof |
| CN101665737A (en) * | 2009-10-14 | 2010-03-10 | 中国石油化工股份有限公司 | Efficient composite fluxing agent for improving melting characteristic of gasified pulverized coal slag |
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2016
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Patent Citations (6)
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|---|---|---|---|---|
| US4057398A (en) * | 1976-02-24 | 1977-11-08 | Apollo Chemical Corporation | Process for reducing the fusion point of coal ash |
| JPS63130698A (en) * | 1986-11-21 | 1988-06-02 | Idemitsu Kosan Co Ltd | Melting point depressant for coal ash |
| CN101580751A (en) * | 2009-06-24 | 2009-11-18 | 淮南师范学院 | Fusing assistant for lowering coal ash fusion temperature and preparation method thereof |
| CN101665737A (en) * | 2009-10-14 | 2010-03-10 | 中国石油化工股份有限公司 | Efficient composite fluxing agent for improving melting characteristic of gasified pulverized coal slag |
| CN102656115A (en) * | 2009-12-18 | 2012-09-05 | 科诺科菲利浦公司 | Flux addition as a filter conditioner |
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Non-Patent Citations (1)
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| 钱宁波等: "灰渣组成与灰渣黏温特性的关联度分析", 《安徽化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923014A (en) * | 2019-10-28 | 2020-03-27 | 中国寰球工程有限公司 | Fluxing agent for adjusting melting characteristic of high-sulfur petroleum coke gasification ash and application thereof |
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Application publication date: 20170322 |