CN1026908C - Construction method of inverted filter on ash storage dam for storing ash water of thermal power plant - Google Patents
Construction method of inverted filter on ash storage dam for storing ash water of thermal power plant Download PDFInfo
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- CN1026908C CN1026908C CN 92102026 CN92102026A CN1026908C CN 1026908 C CN1026908 C CN 1026908C CN 92102026 CN92102026 CN 92102026 CN 92102026 A CN92102026 A CN 92102026A CN 1026908 C CN1026908 C CN 1026908C
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- Prior art keywords
- ash
- asphalt concrete
- pitch
- dam
- loaded filter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 title abstract description 7
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 25
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 238000010348 incorporation Methods 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 235000011194 food seasoning agent Nutrition 0.000 claims 1
- 239000002956 ash Substances 0.000 abstract description 23
- 239000010881 fly ash Substances 0.000 abstract description 7
- 239000002893 slag Substances 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003818 cinder Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The present invention relates to a construction method of ash-storing dam of thermal power plant, and is characterized by that it adopts medium stone, small stone, stone chips, river sand filler and asphalt according to a certain weight mixing ratio, technological process and a certain temp. to prepare asphalt concrete, and said asphalt concrete is spread on the slope and horizontal position of upper portion of dam body, and then rolled to form asphalt concrete reverse filter layer, instead of classical sand and gravel reverse filter layer structure. The permeability coefficient value of the asphalt concrete reverse filter layer is 1-2 orders of magnitude larger than that of the fly ash discharged from a thermal power plant, the reverse filter layer can block ash and slag, ash water is discharged, the content of the fly ash in the discharged leakage ash water after the dam is 4-40mg/l and is less than 500mg/l of the state, the discharge standard is met, the slope of the dam body is changed from 1: 1.25-1: 3.0 to 1: 1.7-1: 2.0, the engineering quantity of the dam body is reduced, and the engineering cost is reduced by 30-40%.
Description
The present invention relates to the job practices of hydraulic engineering.Especially can store the job practices that the open gradation asphalt concrete is counter filters (layer) on the ash storage dam of thermal power plant's buck for a kind of.
The a large amount of coal combustion in steam power station, coal ash after the burning (slag) need have a place to go, and coal ash (powder) flies upward, contaminated air, harmful health of people, so, generally be that ash, water are mixed by pipeline, away from the living area buck are discharged in several kilometers, the tens kilometers outer local material dams (grey dam).The ash dam generally makes permeable dike, to quicken the eliminating of moisture in the lime-ash, reduces pore water pressure, promotes the fixed of lime-ash.For reaching this purpose, anti-filter must be set, block lime-ash, get rid of buck.The material of past loaded filter be generally medium coarse sand, microlith, gravelstone, middle stone etc. which floor, this loaded filter (sand, stone loaded filter) construction is trouble comparatively, " string layer " easily, cost is also expensive.
The object of the present invention is to provide the job practices of loaded filter on a kind of ash storage dam of storing thermal power plant's buck, this method easy construction, formed loaded filter function admirable.
Main technical schemes of the present invention (referring to: process chart) be:
The job practices of loaded filter on a kind of ash storage dam of storing thermal power plant's buck is characterized in that:
A, pitch, the fines that constitutes by medium and small gravelly coarse aggregate, by aggregate chips and river sand are prepared by following weight proportion as raw material and the inserts that is made of lime breeze or low strength cement: medium stone: small crushed stone: aggregate chips: river sand: inserts=45: 27: 20: 4: 4, and the pitch incorporation is 4% of a match ratio total amount.
B. when preparation, coarse-fine aggregate is heated to 130～160 ℃, pitch is dissolved, its melting temperature is 70～100 ℃, make this pitch dehydration afterwards, its dehydration temperaturre is 110～130 ℃, then again this pitch is heated to 160～180 ℃, inserts under above-mentioned coarse-fine aggregate, pitch and the normal temperature is become the asphalt concrete compound by above-mentioned match ratio mix, this moment, this mixture temperature was 100～120 ℃, then with above-mentioned mixture laying on the smooth dry stone wall bed course of compacting, at last temperature is in 90～110 ℃ compound and rolls and form anti-filter.
Said pitch is the 60# bi tumenf orr oad, coarse aggregate is alkaline rubble coarse aggregate, it comprises that particle diameter is that small crushed stone and the particle diameter of 5～10mm is the medium stone of 10～25mm, it is the aggregate chips of 1～5mm and the river sand that particle diameter is 0.075～5mm that fines adopts particle diameter, its fineness mould degree is 2.5～3.5, and the fineness of inserts is 0.075mm, sieve percent of pass 70%, hydrophilic coefficient is less than 1, and water content is less than 0.5%.
Loaded filter thickness on the said ash storage dam face after rolling is 9.5～13cm, and loaded filter divides one deck or the two-layer making that rolls, the paving thickness of dam facing upslope asphalt concrete loaded filter than platform asphalt concrete loaded filter paving thickness less than 1cm.
Said " the open gradation asphalt concrete is counter filters (layer) technology ", the i.e. job practices of the loaded filter of open gradation asphalt concrete on the slope on storage ash (buck) dam of thermal power plant, platform.(table is seen the literary composition back)
The paving thickness of slope asphalt concrete loaded filter after rolling on thermal power plant's storage ash (buck) upstream, dam dam facing is 11.5cm, and the paving thickness of platform (horizontal plane of ash storage dam) asphalt concrete loaded filter after rolling is 12.5cm.
Open gradation asphalt concrete loaded filter technology has following characteristic on thermal power plant's storage ash (buck) dam facing:
1. good is permeable: moisture penetration is gone over, and with the pore water pressure in the dissipation flyash, the precipitation of quickening flyash in the ash is fixed.Flyash character in the ash field is similar to fine sand, and transmission coefficient is generally 10
-4Cm/s(s-second), the transmission coefficient of open gradation asphalt concrete should be generally 10 than its big two magnitudes
-2Magnitude, both mate like this.
2. counter filter property: the ash field is in draining, the flyash content of guaranteeing that the powdered coal cinder particle does not run off or seeing through loaded filter is no more than regulation in country's industry " three wastes " (waste water, waste oil, waste gas) discharging tentative standard (GBJ4-73), suspension＜500mg/L, (L-liter).
3. elastoplasticity and flexible are good, and certain tensile strength is arranged, with differential settlement and the variation that adapts to dam body.
Open gradation asphalt concrete loaded filter is compared with sand, the gravel loaded filter of classical tradition formula and is had following good effect on this ash storage dam:
1. transmission coefficient is 3 * 10
-2Cm/s(s-second) open gradation pitch loaded filter, it can block lime-ash, can get rid of (infiltration) buck again, the anti-function admirable of filtering.Flyash content in the seepage buck that discharges behind the dam is 4-40mg/L, and (L-liter) is significantly less than the discharge standard of country＜500mg/L, and water resource environment is protected.
2. heat stability and water stability are good, and it is subjected to hot-fluid the dropping down property of variations in temperature on dam slope little.Compressive strength is subjected to the influence of full water little.
3. the upstream side slope on grey dam is by original 1: 2.5-1: 3.0 change suddenly to 1: 1.7-1: 2.0.Thereby reduce the dam body engineering quantity, save construction costs.
4. simple in structure, easy construction can realize mechanized construction, and engineering cost reduces 30-40%.
Open gradation asphalt concrete physical and mechanical property table
Serial number name quantitative description remarks
1 unit weight 2.106g/cm
3
2 transmission coefficients (in the time of 20 ℃) 3 * 10
-2Cm/s
3 thermal stability factor K=(20 ℃ of compressive strength)/(50 ℃ of compressive strength) 3.6667
4 water coefficient of stability K=(R20 satisfy water compressive strength)/(R20 compressive strength) 0.8261
5 tensile strength 0.365MPa split the laws
6 slope stabilities (24 hours trickling values of 60 ℃ of constant temperature on 1: 2 side slope) 0.493mm
Compound rolls and forms anti-filter.
Said pitch is the 60# bi tumenf orr oad, coarse aggregate is alkaline rubble coarse aggregate, it comprises that particle diameter is that small crushed stone and the particle diameter of 5～10mm is the medium stone of 10～25mm, it is the aggregate chips of 1～5mm and the river sand that particle diameter is 0.075～5mm that fines adopts particle diameter, its fineness mould degree is 2.5～3.5, and the fineness of inserts is 0.075mm, sieve percent of pass 70%, hydrophilic coefficient is less than 1, and water content is less than 0.5%.
Loaded filter thickness on the said ash storage dam face after rolling is 9.5～13cm, and loaded filter divides one deck or the two-layer making that rolls, and the paving thickness of dam facing upslope asphalt concrete loaded filter is than the little 1cm of platform asphalt concrete loaded filter paving thickness.
Said " the open gradation asphalt concrete is counter filters (layer) technology ", the i.e. job practices of the loaded filter of open gradation asphalt concrete on the slope on storage ash (buck) dam of thermal power plant, platform.
Open gradation asphalt concrete physical and mechanical property table
Serial number name quantitative description remarks
1 unit weight 2.106g/cm
3
2 transmission coefficients (in the time of 20 ℃) 3 * 10
-2Cm/s
3 thermal stability factor K=(20 ℃ of compressive strength)/(50 ℃ of compressive strength) 3.6667
4 water coefficient of stability K=(R20 satisfy water compressive strength)/(R20 compressive strength) 0.8261
5 tensile strength 0.365MPa split the laws
6 slope stabilities (60 ℃ of permanent 0.493mm on the 1:2 side slope
24 hours trickling values of temperature)
Claims (3)
1, the job practices of loaded filter on the ash storage dam of a kind of seasoning thermal power plant buck is characterized in that:
A, pitch, the fines that constitutes by medium and small gravelly coarse aggregate, by aggregate chips and river sand are prepared by following weight proportion as raw material and the inserts that is made of lime breeze or low strength cement; Medium stone: small crushed stone: aggregate chips: river sand: inserts=45: 27: 20: 4: 4, and the pitch incorporation is 4% of a match ratio total amount;
B, coarse-fine aggregate is heated to 130～160 ℃ in when preparation, pitch is dissolved, its melting temperature is 70～100 ℃, make this pitch dehydration afterwards, its dehydration temperaturre is 110～130 ℃, then again this pitch is heated to 160～180 ℃, inserts under above-mentioned coarse-fine aggregate, pitch and the normal temperature is become the asphalt concrete compound by above-mentioned match ratio mix, this moment, this mixture temperature was 100～120 ℃, then with above-mentioned mixture laying on the smooth dry stone wall bed course of compacting, at last temperature is in 90～110 ℃ compound and rolls and form loaded filter.
2, method according to claim 1, it is characterized in that pitch is the 60# bi tumenf orr oad, coarse aggregate is alkaline rubble coarse aggregate, it comprises that particle diameter is that small crushed stone and the particle diameter of 5～10mm is the medium stone of 10～25mm, and it is the aggregate chips of 1～5mm and the river sand that particle diameter is 0.075～5mm that fines adopts particle diameter, and its fineness mould degree is 2.5～3.5, the fineness of inserts is 0.075mm, sieve percent of pass 70%, hydrophilic coefficient is less than 1, and water content is less than 0.5%.
3, method according to claim 1 and 2, it is characterized in that the loaded filter thickness after rolling is 9.5～13cm on the ash storage dam face, loaded filter divides one deck or the two-layer making that rolls, the paving thickness of dam facing upslope asphalt concrete loaded filter than platform asphalt concrete loaded filter paving thickness less than 1cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102026 CN1026908C (en) | 1992-03-30 | 1992-03-30 | Construction method of inverted filter on ash storage dam for storing ash water of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102026 CN1026908C (en) | 1992-03-30 | 1992-03-30 | Construction method of inverted filter on ash storage dam for storing ash water of thermal power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065896A CN1065896A (en) | 1992-11-04 |
| CN1026908C true CN1026908C (en) | 1994-12-07 |
Family
ID=4939426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102026 Expired - Fee Related CN1026908C (en) | 1992-03-30 | 1992-03-30 | Construction method of inverted filter on ash storage dam for storing ash water of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026908C (en) |
-
1992
- 1992-03-30 CN CN 92102026 patent/CN1026908C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065896A (en) | 1992-11-04 |
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