CN102628787A - Water flushing analysis method for limestone fineness for desulfurization of thermal plant - Google Patents
Water flushing analysis method for limestone fineness for desulfurization of thermal plant Download PDFInfo
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- CN102628787A CN102628787A CN2012100999914A CN201210099991A CN102628787A CN 102628787 A CN102628787 A CN 102628787A CN 2012100999914 A CN2012100999914 A CN 2012100999914A CN 201210099991 A CN201210099991 A CN 201210099991A CN 102628787 A CN102628787 A CN 102628787A
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Abstract
The invention discloses a water flushing sieving analysis method for limestone fineness for desulfurization of a thermal plant. The analysis method comprises the following steps of: selecting sieves different diameters according to the requirements of the thermal plant and a limestone powder supplier on the fineness; pouring a weighted limestone powder sample into the sieves; sieving in a water flushing way; filtering the sieved limestone powder together with water; drying at the temperature of 100 DEG C; and weighting to analyze the fineness of the limestone powder. The method has the advantages that: a standard for the limestone powder fineness analysis method for desulfurization of the thermal plant is not provided at present; the analysis method is simple and has high accuracy; relative standard deviations in repeated tests and analysis tests in experimental rooms are below the generally-allowed standard of 5 percent; and the analysis requirement of the thermal plant on the analysis of limestone powder during desulfurization can be met.
Description
Technical field
The present invention is used for heat-engine plant desulfurized analytical approach with agstone fineness (comprise CFBB use agstone with agstone, limestone-gypsum wet desulphurization).
Background technology
According to (GB13223-2003) (2011 be updated to GB13223-2011) regulation of China's " thermal power plant's atmosphere pollutants emission standards ", 200MW and above unit must be supporting desulfurizer.According to statistics, domestic 90% fired power generating unit adopts limestone-gypsum wet desulphurization technology, and about 5% adopt CFBB, and these two kinds of desulfurization methods all need a large amount of agstones, and the expense of agstone accounts for about 50% of desulfurization total expenses.13 thermal power plants that moved with Guangxi are example, and the agstone consumption reached more than 800,000 tons in 2011.
The agstone fineness is very big to operation, desulfuration efficiency, the economic influence of heat-engine plant desulfurizer.Like the limestone-gypsum wet desulphurization, the agstone fineness is too small, and desulfuration efficiency reduces, and the agstone reaction not exclusively reduces its utilization factor, even possibly cause the SO of discharging
2Concentration over-standard catchs a packet, but agstone is meticulous, and agstone grinds expense to be increased, and increases desulphurization cost.To CFBB, the agstone fineness is too small or excessive, all possibly reduce desulfuration efficiency and agstone reaction utilization factor.Simultaneously because the agstone price is more expensive, the agstone price that Guangxi thermal power plant uses greatly about about 120 yuan/ton, nearly 100,000,000 yuan of year agstone expense.Therefore, thermal power plant all has than strict restriction with the agstone fineness desulfurization, and with the sign a contract standard of the clear and definite fineness of Shi Junyou of agstone supplier, it requires usually as follows:
The agstone that CFBB is used: 1.0mm sieves (14 order) surplus≤10%.
Agstone is used in the limestone-gypsum wet desulphurization: 0.065mm sieve (250 order) surplus≤10% (part thermal power plant is 0.045mm sieve (325 order) surplus≤10%).
In order to examine the agstone fineness, when thermal power plant and supplier signed a contract, common 0.065 (or 1.0mm) screen over-size≤10% was qualified, but the every increase by 1% of screen over-size, agstone per ton is reduced 1 yuan, when screen over-size reaches 20%, as defective handling return.
This shows that the analysis of agstone fineness is to the economy of heat-engine plant desulfurized operation, to guaranteeing SO
2The emission compliance energy-saving and emission-reduction, and the influence of agstone supplier's economic interests is all very huge.
Owing to do not formulate heat-engine plant desulfurized analytical approach so far with the agstone fineness; (GB/T21508-2008) analytical approach of agstone fineness do not proposed yet in " coal-fired flue gas desulfurization equipment performance method of testing ", thus at present thermal power plant many with reference to " mensuration of fineness of pulverized coal " (DL/T567.5-95) to the analysis of agstone fineness.But very big with this analytical approach to its error of agstone, adopt the high-abrasive material dry grinding when mainly being the preparation agstone, cause agstone electrically charged more; Thereby the mutual agglomerating phenomenon of agstone is commonplace when sieving; Its sieving rate is quite low when adopting vibration screening, and agstone is thinner, and sieving rate is lower; Can not reflect the fineness that agstone is real, and occur thermal power plant thus and the contract dispute phenomenon appears in agstone supplier.Table 1 is the different desulfurization of thermal power plant with agstone reference " mensuration of fineness of pulverized coal " (DL/T567.5-95) to the analysis result of agstone fineness.
Table 1:
Summary of the invention
In order accurately to analyze the heat-engine plant desulfurized agstone fineness of using; Guarantee the normal operation of heat-engine plant desulfurized system and agstone supplier's interests; To the present domestic problem that does not have heat-engine plant desulfurized with agstone fineness analytical approach, the present invention provides a kind of analytical approach that can accurately analyze the agstone fineness.
Mutual agglomerating phenomenon when sieving because of static electrification for overcoming agstone, problem such as sieving rate is low, error is big, utilizing the solubleness of agstone in water simultaneously, extremely low (solubleness 50 ℃ the time is merely 0.038mg/m
3) principle, adopt water to wash the fineness of the methods analyst agstone that sieves, neither cause agstone because of the water-soluble error that produces, can eliminate agstone static electrification phenomenon simultaneously, make it be easy to sieve.The technical scheme that the present invention solves the problems of the technologies described above is following:
Heat-engine plant desulfurized analytical approach, specifically operation according to the following steps with the agstone fineness:
1) 100 ℃ of oven dry of qualitative filter filter paper are placed in the exsiccator, drop to room temperature after, accurately take by weighing its weight;
2) according to thermal power plant and agstone supplier to the contract requirement (CR) of agstone fineness, prepare the analysis sieve (this example is an example with the 0.065mm sieve) of respective diameters, and the screen tray water rinsed well, will analyze to sieve and place on the screen tray;
3) adjust the water tap water yield, pressure, and distance be 40-50mm between control water swivel and the screen cloth, its water swivel water yield, pressure are advisable not spill spray, wash 2-3min continuously, stop to wash after more as clear as crystal with the back tap water that sieves;
4) water in the screen tray and agstone are poured into filter paper filters, are weighed after 100 ℃ of oven dry, obtain the lime stone powder through the 0.065mm screen over-size through computes:
In the formula:
R
250: the lime stone powder is through 0.065mm screen over-size, %
G: take by weighing the agstone sample weight, g
A
250: agstone passes through 0.065mm sieve amount, g:
A
250＝G
1-G
2 (2)
G
1: filter back filter paper and agstone weight, g
G
2: filter paper weight, g
For check makes water washing analysis method test result accuracy and precision, use agstone fineness water washing analysis method of the present invention to compare with agstone and art methods analysis result to heat-engine plant desulfurized:
1. table 2,3, the different agstone of 4 thermal power plants (DL/T567.5-95) contrast with the result who uses this method the analysis result of agstone fineness with reference to " mensuration of fineness of pulverized coal ".Visible by result in the table, agstone is thinner, and sieving rate is lower when directly sieving; The agstone of not drying and drying; Its screen over-size does not have too big difference, and 1.0mm sieve screen over-size is greatly about the 26%-30% scope, and 0.065mm sieve screen over-size is greatly about the 70%-80% scope; 0.045mm the sieve screen over-size is then up to about 95%, and the screen over-size of these agstones of water washing analysis method all has only below 10% or 10%.This shows and make both errors of water washing analysis method contrast very big, be easy to cause the economic dispute of agstone supplier and thermal power plant.
Table 2: result's (circulating fluid bed boiler desulfurization is used agstone) when agstone carries out the fineness analysis with the 1.0mm sieve
Table 3: result's (agstone is used in the limestone-gypsum wet desulphurization) when agstone carries out the fineness analysis with the 0.065mm sieve
Table 4: result's (agstone is used in the limestone-gypsum wet desulphurization) when agstone carries out the fineness analysis with the 0.045mm sieve
2. precision test
Replica test: analyze the heat-engine plant desulfurized agstone precision of analysis of using in order to judge water flushing method, carried out the replica test of same sample, its result sees table 5.
Table 5: make water washing analysis method analyze desulfurization and use the agstone replica test
Visible by table 5, same sample, three replica test results' relative standard deviation is all at below 5% of common permission.
Contrast test between the laboratory: contrast test between the laboratory has been carried out in the laboratory of two thermal power plants in Guangxi and our unit laboratory totally three laboratories, and its test findings is seen table 6.
Table 6: make the same agstone analysis result of 3 lab analysis of water washing analysis method
| Laboratory 1 | Laboratory 2 | Laboratory 3 | Relative standard deviation % | |
| Sample 1 is not through 1.0mm screen over-size % | 7.63 | 8.10 | 7.84 | 3.0 |
| Sample 2 is not through 0.065mm screen over-size % | 7.44 | 7.89 | 7.21 | 4.60 |
| Sample 3 is not through 0.045mm screen over-size % | 8.01 | 8.14 | 7.79 | 2.12 |
Visible by table 6, the relative standard deviation between three laboratories is all below 5%.
Advantage of the present invention has:
1. propose heat-engine plant desulfurized analytical approach first, can be used as thermal power plant and agstone supplier analytical approach the common approval of agstone fineness with the agstone fineness.
2. this analytical approach is easy, does not need specialized equipment equipment;
3. this analytical approach result is accurate, can satisfy heat-engine plant desulfurized analysis requirement with the agstone fineness.
Embodiment
Below in conjunction with embodiment the present invention is further described.
Embodiment 1: Guangxi power plant circulating fluid bed boiler desulfurization is used agstone, and its contract requirement (CR) is not through 1.0mm screen over-size≤10%.
Get 2 parts of agstone samples, sample 1, sample 2, use water washing analysis method of the present invention and " mensuration of fineness of pulverized coal " analytical approach comparative analysis test:
1. with sample 1, sample 2 after 100 ℃ of oven dry, take by weighing 25.0g (being accurate to 0.01g) respectively, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 7.
Table 7: oven dry back agstone adopts " mensuration of fineness of pulverized coal " assay method 1.0mm screen over-size analysis result
2. agstone is not dried, directly weighing sample 1, sample 2, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 8.
Table 8: do not dry agstone and adopt " mensuration of fineness of pulverized coal " assay method 1.0mm screen over-size analysis result
3. with sample 1, sample 2 after 100 ℃ of oven dry, make water washing analysis method carry out its fineness analysis:
Take by weighing 25.0g (being accurate to 0.01g) respectively; Pour sample into diameter 1.0mm and analyze in the sieve, sieve is contained with screen tray, adjusts the water tap water yield, pressure; And distance is between the 40-50mm between control water swivel and the screen cloth; Its water swivel water yield, pressure are advisable not spill spray, wash 2-3min continuously, and the back tap water stops flushing after more as clear as crystal to sieve.Water in the screen tray and agstone are poured into filter paper filters, weighed after 100 ℃ of oven dry, calculate the lime stone powder through the 1.0mm screen over-size through (1), (2) formula.Its result sees table 9.
Table 9: agstone adopts water washing analysis method 1.0mm screen over-size analysis result
Visible by table 7, table 8, circulating fluid bed boiler desulfurization with agstone by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the agstone fineness when analyzing, the 1.0mm screen over-size is in the 20-30% scope; And use analytical approach of the present invention, the 1.0mm screen over-size is 5-7% only.
Embodiment 2: Guangxi 300MW unit thermal power plant adopts the limestone-gypsum wet desulphurization, and the agstone contract requirement (CR) is not through 0.065mm sieve (250 order) surplus≤10%.
Get 3 parts of agstone samples, be respectively sample 1, sample 2, sample 3, equally by instance one 1. 2. 3. step analyze:
1. with sample 1, sample 2, sample 3 after 100 ℃ of oven dry, take by weighing 25.0g (being accurate to 0.01g) respectively, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 10.
Table 10: oven dry back agstone adopts " mensuration of fineness of pulverized coal " assay method 0.065mm screen over-size analysis result
2. agstone is not dried, directly weighing sample 1, sample 2, sample 3, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 11.
Table 11: do not dry agstone and adopt " mensuration of fineness of pulverized coal " assay method 0.065mm screen over-size analysis result
3. with sample 1, sample 2, sample 3 after 100 ℃ of oven dry, make water washing analysis method carry out its fineness analysis, its analysis result is seen table 12.
Table 12: agstone adopts water washing analysis method 0.065mm screen over-size analysis result
Visible by table 10, table 11; The limestone-gypsum wet desulphurization with agstone by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the agstone fineness when analyzing; 0.065mm screen over-size about 78%, and is used analytical approach of the present invention, the 0.065mm screen over-size is 6-7% only.
Embodiment 3: Guangxi 300MW unit thermal power plant adopts the limestone-gypsum wet desulphurization, and the agstone contract requirement (CR) is not through 0.045mm sieve (325 order) surplus≤10%.
Get 3 parts of agstones, be respectively sample 1, sample 2, sample 3, equally by instance one 1. 2. 3. step analyze:
1. with sample 1, sample 2, sample 3 after 100 ℃ of oven dry, take by weighing 25.0g (being accurate to 0.01g) respectively, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 13.
Table 13: oven dry back agstone adopts " mensuration of fineness of pulverized coal " assay method 0.045mm screen over-size analysis result
2. agstone is not dried, directly weighing sample 1, sample 2, sample 3, by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the analysis of agstone fineness.Its analysis result is seen table 14.
Table 14: do not dry agstone and adopt " mensuration of fineness of pulverized coal " assay method 0.065mm screen over-size analysis result
3. with sample 1, sample 2, sample 3 after 100 ℃ of oven dry, make water washing analysis method carry out its fineness analysis, its analysis result is seen table 15.
Table 15: agstone adopts water washing analysis method 0.045mm screen over-size analysis result
Visible by table 14, table 15; The limestone-gypsum wet desulphurization with agstone by " mensuration of fineness of pulverized coal " (DL/T567.5-95) analytical approach carry out the agstone fineness when analyzing; 0.045mm screen over-size is up to more than 90%; And use analytical approach of the present invention, the 0.045mm screen over-size is 5-12% only, differs very big.
Visible from table 7-table 15, agstone is thinner, and it is littler to analyze screen aperture; It is just bigger that two kinds analysis result differs, and this mainly is that the agstone diameter is littler, and the static electrification lotus just the more; Intermolecular mutual absorbability is just bigger; It is just stronger when directly sieving, to be in unity ball phenomenon, and sieving rate is just lower, and the fineness errors of analytical results is just bigger.The analytical approach that the water flushing is sieved is then eliminated agstone static electrification and mutual agglomerating phenomenon, and its analysis result has reflected real agstone fineness.
Claims (1)
1. heat-engine plant desulfurized analytical approach with the agstone fineness is characterized in that operation steps is following:
1) 100 ℃ of oven dry of qualitative filter filter paper are placed in the exsiccator, drop to room temperature after, accurately take by weighing its weight;
2) according to thermal power plant and agstone supplier to the contract requirement (CR) of agstone fineness, prepare the analysis sieve (this example is an example with the 0.065mm sieve) of respective diameters, and the screen tray water rinsed well, will analyze to sieve and place on the screen tray;
3) adjust the water tap water yield, pressure, and distance be 40-50mm between control water swivel and the screen cloth, its water swivel water yield, pressure are advisable not spill spray, wash 2-3min continuously, stop to wash after more as clear as crystal with the back tap water that sieves;
4) water in the screen tray and agstone are poured into filter paper filters, are weighed after 100 ℃ of oven dry, obtain the lime stone powder through the 0.065mm screen over-size through computes:
In the formula:
R
250: the lime stone powder is through 0.065mm screen over-size, %
G: take by weighing the agstone sample weight, g
A
250: agstone passes through 0.065mm sieve amount, g:
A
250＝G
1-G
2 (2)
G
1: filter back filter paper and agstone weight, g
G
2: filter paper weight, g
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105808902A (en) * | 2014-12-27 | 2016-07-27 | 上海麦杰环境科技有限公司 | Qualitative method used for analyzing operational condition of wet desulphurization system |
| CN110132787A (en) * | 2019-06-04 | 2019-08-16 | 福建省联盛纸业有限责任公司 | A kind of detection method of paper grade (stock) agstone |
| CN110763588A (en) * | 2018-07-25 | 2020-02-07 | 宝山钢铁股份有限公司 | Evaluation method for granulation effect of quicklime for sintering |
| CN111537385A (en) * | 2020-04-26 | 2020-08-14 | 山东莱钢永锋钢铁有限公司 | Cement fineness inspection method |
| CN112540158A (en) * | 2020-11-25 | 2021-03-23 | 广西电网有限责任公司电力科学研究院 | Method for testing utilization rate of limestone wet desulphurization forced oxidation air |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105808902A (en) * | 2014-12-27 | 2016-07-27 | 上海麦杰环境科技有限公司 | Qualitative method used for analyzing operational condition of wet desulphurization system |
| CN105808902B (en) * | 2014-12-27 | 2020-09-18 | 上海麦杰环境科技有限公司 | Qualitative method for analyzing operation condition of wet desulphurization system |
| CN110763588A (en) * | 2018-07-25 | 2020-02-07 | 宝山钢铁股份有限公司 | Evaluation method for granulation effect of quicklime for sintering |
| CN110132787A (en) * | 2019-06-04 | 2019-08-16 | 福建省联盛纸业有限责任公司 | A kind of detection method of paper grade (stock) agstone |
| CN111537385A (en) * | 2020-04-26 | 2020-08-14 | 山东莱钢永锋钢铁有限公司 | Cement fineness inspection method |
| CN112540158A (en) * | 2020-11-25 | 2021-03-23 | 广西电网有限责任公司电力科学研究院 | Method for testing utilization rate of limestone wet desulphurization forced oxidation air |
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Application publication date: 20120808 |