CN105001914A - Coking fly ash-doped coal co-gasification method - Google Patents
Coking fly ash-doped coal co-gasification method Download PDFInfo
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- CN105001914A CN105001914A CN201510390548.6A CN201510390548A CN105001914A CN 105001914 A CN105001914 A CN 105001914A CN 201510390548 A CN201510390548 A CN 201510390548A CN 105001914 A CN105001914 A CN 105001914A
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Abstract
A coking fly ash-doped coal co-gasification method belongs to the field of a coal gasification technology. The method comprises the following steps: 1) a coal sample and coking fly ash respectively undergo ash content, volatile component, ash chemical composition, ash fusion temperature and CO2 gasification reactivity measurements; 2) the coal sample and coking fly ash are mixed in proportion according to ash content, volatile component, ash chemical composition, ash fusion temperature and CO2 gasification reactivity index R0.5 of the coal sample and coking fly ash, so as to obtain a mixed coal sample; and 3) the mixed coal sample is sent into a gasification furnace to be gasified. By the coking fly ash-doped coal co-gasification, yield of effective gas can be increased, and cost of raw materials is remarkably reduced so as to raise economic benefit of a coal gasification enterprise. Meanwhile, coking fly as generated from a coking enterprise is reused, and the problem that lots of coking fly ash is piled-up and cannot be processed is solved for the coking enterprise.
Description
Technical field
The invention belongs to Coal Gasification Technology field, be specifically related to a kind of coking dedusting ash and mix the method that coal gasifies altogether.
Background technology
Coke-oven plant traditional coalingging, coke-pushing process can produce a large amount of dedusting ash, especially in recent years, along with the application of Dry Quenching Technology, the dedusting ash output of coke-oven plant is increased day by day, according to statistics, the output of coking dedusting ash accounts for greatly 4% of coke ultimate production, and the accumulation of a large amount of dedusting ash not only causes the waste of resource and contaminate environment.Analyze after testing and show, it is high that coking dedusting ash has fixed carbon content, low and the basic component content high of volatile matter, therefore, mostly existing enterprise is coking dedusting ash to return to join coking, or replaces part hard coal as the blast furnace blowing fuel of metallurgy industry by dedusting ash, so not only realize the recycling of dedusting ash, reduce environmental stress, and reduce the process for processing cost of coking, metallurgy industry, there is certain economic benefit.
But, in actual production process, in order to ensure that lasting, the stability of producing is produced, coking dedusting ash return that the allocation ratio of joining coking is no more than coking coal sample 20%, and in metallurgy industry field, coking dedusting ash allocates anthracitic ratio less (≤5%) into, these a large amount of coking dedusting ash that coke-oven plant is produced cannot be recycled completely, the coking dedusting ash that part coke-oven plant produces is deposited in plant area, and the granule dust of generation has had a strong impact on the health of staff.Therefore, seek the utilization ways of new coking dedusting ash, this is the problem that technician is considering always.
Summary of the invention
Primary and foremost purpose of the present invention be to provide a kind of easy to use, effectively can ensure the method that coking dedusting ash that production persistence is carried out is mixed coal and gasified altogether.
To achieve these goals, present invention employs following technical scheme: a kind of coking dedusting ash mixes the method that coal gasifies altogether, and its step is as follows:
S1) coal sample and coking dedusting ash are carried out ash content, volatile matter, grey chemical constitution, grey melt temperature and CO respectively
2gasification activity measures;
S2) according to step S1) ash content of the coal sample that records and coking dedusting ash, volatile matter, grey chemical constitution, grey melt temperature and CO
2gasification reaction sex index R
0.5coal sample and coking dedusting ash are mixed in proportion and obtain mixing coal sample, the ratio that the ash content quality controlling mixing coal sample is 18%-20%, volatile matter quality is acidic oxide and basic oxide mass content in 6%-8%, ash is 4.8-5.2, ash fluid point is 1340-1380 DEG C, CO
2gasification reaction sex index R
0.5for (6.5-6.8) * 10
-3; Reactivity indexes R
0.5=0.5/t
0.5the reactive important parameter of thermogravimetric analysis coal tar, wherein t
0.5refer to that efficiency of carbon conversion reaches the time of 50% under identical temperature rise rate.Under identical temperature rise rate, R
0.5larger, reactivity is better.
S3) undertaken gasifying by mixing coal sample feeding vapourizing furnace.
The beneficial effect adopting technique scheme to produce is: for coal in China retained reserve 57% high-ash-fusion coal be difficult to directly be used as the problem of entrained flow gasification, mostly enterprise is to buy low-ash-fusion coal, or fusing assistant is equipped with reduction coal ash melting temperature mutually with these high-ash-fusion coals, Comparatively speaking, the present invention mixes coal by coking dedusting ash gasifies altogether, so not only can solve coking dedusting ash and utilize narrow range, the problem of contaminate environment, and raw material is easy to get, cheap, importantly effectively can improve coal ash melting temperature and the viscosity-temperature characteristics of high-ash-fusion coal, thus make high-ash-fusion coal can safety, stably drop in vapourizing furnace and gasify.Concrete, through experimental verification, compared with two kinds of coal mixing gasifyings of high and low coal ash fusion temperature, adopt coking dedusting ash to mix coal blending to gasify altogether and not only can increase the output of effective gas, and raw materials cost significantly declines, and effectively can improve the economic benefit of gasification enterprise, simultaneously, the coking dedusting ash that coal chemical enterprise produces is recycled, also for coal chemical enterprise solves the difficult problem of piling up a large amount of coking dedusting ash and cannot process, and improves its income.
As further preferred version: in described step S1, the ash fluid point of coal sample is 1500-1600 DEG C, the yield temperature of coking dedusting ash is between 1300-1330 DEG C, in general, the yield temperature of the coking dedusting ash that coal chemical enterprise produces in process of production is on the low side, in order to ensure lasting, the steady running of coal gasifier, the coal sample of ash fluid point between 1500-1600 DEG C is preferably adopted to carry out mixing common gasification with coking dedusting ash.
Concrete scheme is, the coking dedusting ash in described step S1 and coal sample are at mensuration ash content, volatile matter, grey chemical constitution, grey melt temperature and CO
2granularity is all milled at below 0.2mm before gasification activity, proved by a large amount of experiments, coking dedusting ash and coal sample are first milled to granularity at below 0.2mm, and the data such as the ash content measured like this, volatile matter and grey chemical constitution can better for the determination of the blending ratio of coking dedusting ash and coal sample provides foundation.
Preferably, in the mixing coal sample of described step S2, the mass ratio of coking dedusting ash and coal sample is (14-18): 100.Multiple high ash melting point coal sample is acquired from the different mining areas in area, the two Hua Areas, according to GB, each coal sample is made coal sample analysis respectively, consider the coal ash feature of these coal samples, coking dedusting ash is mixed coal blending and is carried out common gasification by preferred employing aforementioned proportion, coking dedusting ash is so not only made to be fully utilized, reduce the processing pressure of coal chemical enterprise, but also effectively can ensure safe, stable, the continuous service that gasification is produced.Specifically, calculate by analysis and learn, adopt the synthetic gas of the mixing coal sample that is mixed to get of aforementioned proportion composition and effectively airshed is high, and than oxygen consumption, reduce than coal consumption, therefore can be enterprise and bring huge economic benefit.
Accompanying drawing explanation
Fig. 1 is the CO of mixing coal sample
2gasification reaction linearity curve;
Fig. 2 is the coal ash viscosity-temperature characteristics curve of mixing coal sample.
Shadow region is the region of viscosity 2.5-25pa.s.General requirement coal ash controls between 2.5 ~ 25Pas at the viscosity number of 1300-1450 DEG C, and the temperature further illustrating the sample viscosity of embodiment of the present invention coal sample 1+14% dedusting ash corresponding when 25Pas is relatively low, better effects if.
Embodiment
By the following examples technical scheme disclosed by the invention is described further, but the present invention is not limited to following examples.
Embodiment
1) collect coal sample and coking dedusting ash (hereinafter referred to as dedusting ash), be milled to granularity respectively at below 0.2mm.
2) coal sample of milled and dedusting ash are carried out ash content, volatile matter, grey chemical constitution, grey melt temperature and CO respectively
2gasification activity measures, and concrete measurement result is see table 1-4, and wherein coal sample 1 is sample coal sample, and coal sample 2 is contrast coal sample;
3) coal sample measured in foundation table 1-4 and the ash content of dedusting ash, volatile matter, grey chemical constitution, grey melt temperature and CO
2gasification activity measures, dedusting ash and coal sample are pressed (14-18): the mass ratio of 100 carries out being mixed to get mixing coal sample, make to mix that the ash content of coal sample is 18%-20%, volatilization is divided into that the ratio of acidic oxide and basic oxide content in 6%-8%, ash is 4.8-5.2, ash fluid point is 1340-1380 DEG C, CO
2gasification reaction sex index R
0.5for (6.5-6.8) * 10
-3, meanwhile, to dedusting ash and coal sample by (5-12): 100 and the mixing coal sample that is mixed to get of the mass ratio of 20:100 also carried out grey melt temperature and measured as a comparison case, contrast with disclosed embodiment of this invention;
4) dedusting ash is mixed mixing coal sample that coal blending obtains to send in vapourizing furnace and gasify.
The technical analysis result of table 1 coal sample and dedusting ash
Wherein, A
ad-ash content, V
ad-volatile matter.
The technical analysis result of table 2 coal sample and dedusting ash
Table 3 coal sample, dedusting ash and dedusting ash mix the grey melt temperature of the mixing coal sample of coal blending
Wherein: " coal sample+5% dedusting ash " refers in coal sample that mixing aglycon amount addition is the dedusting ash of 5%, by that analogy.
The CO of table 4 coal sample and dedusting ash
2gasification reaction sex index R
0.5
As can be seen from Table 3, coal sample 1 yield temperature chosen is greater than 1500 DEG C, belong to high grey melt temperature coal, and the melt temperature of dedusting ash is lower, mix and join the coal ash meltbility that dedusting ash obviously can improve coal sample 1, concrete, when the quality addition of dedusting ash is 10%, the ash fluid point of coal sample 1 have dropped 90 DEG C, when the quality addition of dedusting ash is 14%, the ash fluid point of coal sample 1 has been down to less than 1400 DEG C, and continue the quality addition increasing dedusting ash, although four of coal sample 1 coal ash melting characteristic temperature present downtrending, but fall is not obvious.
As can be seen from Table 4, the reactivity of coal sample 1 is higher than dedusting ash, the reactivity of mixing coal sample is between the above two, but in general, along with the increase of dedusting ash allocation ratio, the reactivity of mixing coal sample presents downtrending, therefore guaranteeing to mix under the grey melt temperature of coal sample meets the prerequisite that entrained flow gasification requires, for preventing mixing the reduction that the decline of coal sample reactivity causes efficiency of carbon conversion and effective gas output, it is unsuitable too high that dedusting ash mixes the ratio of joining, the preferred dedusting ash quality addition allocated in coal sample 1 is in the scope of 14%-18% of the present invention.
Different ratios dedusting ash allocates the CO of the mixing coal sample of coal sample 1 into
2gasification activity song is shown in Fig. 1.
Further, the two mixing coal samples quality addition of coal sample 1 and dedusting ash being respectively 12%, 14% carry out ashing, three ash samples are carried out mensuration and the comparative analysis of viscosity-temperature characteristics, record ash sample viscosity-temperature curve as shown in Figure 2, therefrom can find out: the ash viscosity of coal sample 1 is larger; Coal sample 1 mixes the mixing coal sample of joining 12% dedusting ash
coal ash corresponding viscosity number 1450 DEG C time is greater than 25Pas; Coal sample 1 mixes the mixing coal sample A joining 14% dedusting ash
coal ash viscosity-temperature curve is comparatively steady, and its corresponding viscosity number 1415 DEG C time is less than 25Pas, meets airflow bed gasification furnace requirement, as can be seen here, adopts technical scheme disclosed by the invention to carry out dedusting ash and mixes safety, the steady running that coal blending can ensure vapourizing furnace.
In addition, under the processing condition of identical gasification analog calculation, contrast mixing the gasification analog result of mixing the mixing coal sample B joining 14% coal sample 2 formation in coal sample A (mixing coal sample A is that coal sample 1 mixes the mixing coal sample of joining 14% dedusting ash) and coal sample 1, result is as shown in table 5:
Table 5 mixes the gasification result of coal sample
As can be seen from Table 5, compared with mixing coal sample B, synthetic gas composition and effective airshed of mixing coal sample A are all higher, and than oxygen consumption and lower than coal consumption, therefore mix with the low melting point coal of prior art and join compared with high-ash-fusion coal gasifies altogether, adopt dedusting ash to mix to join high-ash-fusion coal and not only to gasify high efficiency, and the price of dedusting ash is low, effectively can solve the problem of coal chemical enterprise factory bulk deposition coking dedusting ash during use.
Claims (4)
1. coking dedusting ash mixes the method that coal gasifies altogether, it is characterized in that, its step comprises as follows:
S1) coal sample and coking dedusting ash are carried out ash content, volatile matter, grey chemical constitution, grey melt temperature and CO respectively
2gasification activity measures;
S2) according to step S1) ash content of the coal sample that records and coking dedusting ash, volatile matter, grey chemical constitution, grey melt temperature and CO
2gasification reaction sex index R
0.5coal sample and coking dedusting ash are mixed in proportion and obtain mixing coal sample, the ratio that the ash content quality controlling mixing coal sample is 18%-20%, volatile matter quality is acidic oxide and basic oxide mass content in 6%-8%, ash is 4.8-5.2, ash fluid point is 1340-1380 DEG C, CO
2gasification reaction sex index R
0.5for (6.5-6.8) * 10
-3; Reactivity indexes R
0.5=0.5/t
0.5, wherein t
0.5refer to that efficiency of carbon conversion reaches the time of 50% under identical temperature rise rate;
S3) undertaken gasifying by mixing coal sample feeding vapourizing furnace.
2. mix according to a kind of coking dedusting ash of claim 1 method that coal gasifies altogether, it is characterized in that, step S1) in the ash fluid point of coal sample be 1500-1600 DEG C, the yield temperature of coking dedusting ash is between 1300-1330 DEG C.
3. mix according to a kind of coking dedusting ash of claim 1 method that coal gasifies altogether, it is characterized in that, step S1) in coking dedusting ash and coal sample at mensuration ash content, volatile matter, grey chemical constitution, grey melt temperature and CO
2granularity is all milled at below 0.2mm before gasification activity.
4. mix according to a kind of coking dedusting ash of claim 1 method that coal gasifies altogether, it is characterized in that, step S2) mixing coal sample in the mass ratio of coking dedusting ash and coal sample be (14-18): 100.
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| WO2023081821A1 (en) * | 2021-11-04 | 2023-05-11 | Suncoke Technology And Development Llc | Foundry coke products, and associated systems, devices, and methods |
| US11788012B2 (en) | 2015-01-02 | 2023-10-17 | Suncoke Technology And Development Llc | Integrated coke plant automation and optimization using advanced control and optimization techniques |
| US11807812B2 (en) | 2012-12-28 | 2023-11-07 | Suncoke Technology And Development Llc | Methods and systems for improved coke quenching |
| US11819802B2 (en) | 2018-12-31 | 2023-11-21 | Suncoke Technology And Development Llc | Methods and systems for providing corrosion resistant surfaces in contaminant treatment systems |
| US11845898B2 (en) | 2017-05-23 | 2023-12-19 | Suncoke Technology And Development Llc | System and method for repairing a coke oven |
| US11939526B2 (en) | 2012-12-28 | 2024-03-26 | Suncoke Technology And Development Llc | Vent stack lids and associated systems and methods |
| US11946108B2 (en) | 2021-11-04 | 2024-04-02 | Suncoke Technology And Development Llc | Foundry coke products and associated processing methods via cupolas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11807812B2 (en) | 2012-12-28 | 2023-11-07 | Suncoke Technology And Development Llc | Methods and systems for improved coke quenching |
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Inventor after: Ning Limin Inventor after: Li Hanxu Inventor after: Li Hongjuan Inventor after: Wang Zhiyan Inventor after: Liu Xiang Inventor after: Cui Jianfang Inventor after: Xin Yu Inventor after: Wang Yatao Inventor before: Cui Jianfang Inventor before: Li Hanxu Inventor before: Zhang Lei Inventor before: Ning Limin Inventor before: Liu Xiang Inventor before: Yan Jiacai Inventor before: Xin Yu Inventor before: Wang Yatao |
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