Water flushing analysis method for limestone fineness for desulfurization of thermal plant

A technology of limestone powder and analysis method, applied in particle size analysis, particle and sedimentation analysis, preparation of test samples, etc., can solve the problems of large error, low sieving rate, mutual agglomeration, etc. The effect of simple requirements and analysis methods

Inactive Publication Date: 2012-08-08
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0011] In order to accurately analyze the fineness of limestone powder used for desulfurization in thermal power plants, ensure the normal operation of the desulfurization system of thermal power plants and the interests of limestone powder suppliers, aiming at the problem that there is no analysis method for the fineness of limestone powder for desulfurization in thermal power plants in China, the present invention provides a Analytical method that can accurately analyze the fineness of limestone powder
[0012] In order to overcome the problems of mutual agglomeration, low sieving rate, and large error when limestone powder is sieved with static electricity, at the same time, the solubility of limestone powder in water is extremely low (the solubility at 50°C is only 0.038mg / m 3 ) principle, the method of rinsing and sieving with water is used to analyze the fineness of limestone powder, which will not cause errors due to the dissolution of limestone powder in water, and at the same time can eliminate the electrostatic phenomenon of limestone powder, making it easy to sieve

Method used

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  • Water flushing analysis method for limestone fineness for desulfurization of thermal plant
  • Water flushing analysis method for limestone fineness for desulfurization of thermal plant
  • Water flushing analysis method for limestone fineness for desulfurization of thermal plant

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Example 1: Limestone powder used for desulfurization of a circulating fluidized bed boiler in a certain power plant in Guangxi, the contract requirement is that the 1.0mm sieve residue is not more than 10%.

[0049] Get 2 parts of limestone powder samples, sample 1, sample 2, use water flushing analysis method of the present invention and " mensuration of pulverized coal fineness " analysis method comparative analysis test:

[0050] ① After drying sample 1 and sample 2 at 100°C, weigh 25.0g (accurate to 0.01g) respectively, and carry out the fineness of limestone powder according to the analysis method of "Determination of Coal Fineness" (DL / T567.5-95). degree analysis. The analysis results are shown in Table 7.

[0051] Table 7: Analysis results of 1.0mm sieve residue of limestone powder after drying using the determination method "Determination of Coal Fineness"

[0052]

[0053]② Without drying the limestone powder, directly weigh sample 1 and sample 2, and anal...

Embodiment 2

[0061] Example 2: A 300MW unit thermal power plant in Guangxi adopts limestone-gypsum wet desulfurization, and the contract requirement for limestone powder is that the balance not passing through a 0.065mm sieve (250 mesh) is ≤10%.

[0062] Take 3 samples of limestone powder, namely sample 1, sample 2, and sample 3, and analyze them according to the steps of ①②③ in Example 1:

[0063] ① After drying sample 1, sample 2 and sample 3 at 100°C, weigh 25.0g (accurate to 0.01g) respectively, and carry out according to the analysis method of "Determination of Fineness of Coal Powder" (DL / T567.5-95) Limestone powder fineness analysis. The analysis results are shown in Table 10.

[0064] Table 10: Analysis results of 0.065mm sieve residue of limestone powder after drying using the determination method "Determination of Coal Fineness"

[0065]

[0066] ② Without drying the limestone powder, directly weigh sample 1, sample 2, and sample 3, and analyze the fineness of limestone powd...

Embodiment 3

[0073] Example 3: A 300MW unit thermal power plant in Guangxi adopts limestone-gypsum wet desulfurization, and the contract requirement for limestone powder is that the balance of failing to pass through a 0.045mm sieve (325 mesh) is ≤ 10%.

[0074] Get 3 parts of limestone powder, which are sample 1, sample 2, and sample 3 respectively, and analyze according to the steps of ①②③ in Example 1:

[0075] ① After drying sample 1, sample 2 and sample 3 at 100°C, weigh 25.0g (accurate to 0.01g) respectively, and carry out according to the analysis method of "Determination of Fineness of Coal Powder" (DL / T567.5-95) Limestone powder fineness analysis. The analysis results are shown in Table 13.

[0076] Table 13: Analysis results of 0.045mm sieve residue of limestone powder after drying using the method "Determination of Coal Fineness"

[0077]

[0078] ② Without drying the limestone powder, directly weigh sample 1, sample 2, and sample 3, and analyze the fineness of limestone po...

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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 [0001] The invention is an analysis method for the fineness of limestone powder used for desulfurization in thermal power plants (including limestone powder used for circulating fluidized bed boilers and limestone powder used for wet desulfurization of limestone-gypsum). Background technique [0002] According to my country's "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2003) (updated to GB13223-2011 in 2011), units of 200MW and above must be equipped with desulfurization devices. According to statistics, 90% of domestic thermal power units use limestone-gypsum wet desulfurization technology, and about 5% use circulating fluidized bed boilers. Both of these desulfurization methods require a large amount of limestone powder, and the cost of limestone powder accounts for 10% of the total cost of desulfurization. About 50%. Taking the 13 thermal power plants in operation in Guangxi as an example, the consumption of limestone powder i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N5/04G01N1/34
Inventor 林朝扶陈彬范华
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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