Method for testing natural oxidation rate of limestone wet desulphurization absorption tower slurry

A wet desulfurization and natural oxidation technology, applied in chemical method analysis, chemical instruments and methods, and detection of element existence through oxidation, etc., can solve problems such as equipment waste, increased power consumption of desulfurization system, and failure of desulfurization system to operate normally. , to achieve the effect of simple test method and accurate results

Inactive Publication Date: 2021-04-13
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the designed value of the natural oxidation rate of the slurry is too high, the design of the forced oxidation system may be too small, resulting in incomplete oxidation of the slurry in the absorption tower, and the desulfurization system cannot operate normally; power increase

Method used

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  • Method for testing natural oxidation rate of limestone wet desulphurization absorption tower slurry
  • Method for testing natural oxidation rate of limestone wet desulphurization absorption tower slurry
  • Method for testing natural oxidation rate of limestone wet desulphurization absorption tower slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1 Natural oxidation rate test of limestone wet flue gas desulfurization system of No. 2 unit of 330MW unit in a certain power plant

[0061] 1. The 330MW unit of a power plant in Guangxi adopts a limestone wet flue gas desulfurization system. The absorption tower has 4 spray layers (corresponding to 4 slurry circulation pumps). The design value of sulfur content in coal combustion is 2.83%. 2 Concentration FGD inlet design value is 6800mg / m 3 (mark, dry, O 2 6%), the designed flue gas volume is 1089235m 3 / h (mark, dry, O 2 6%), which emits SO 2 Concentration allowable discharge standard is less than 400mg / m 3 (mark, dry, O 2 6%). The forced oxidation air system set up is one tower with two oxidation fans (one for use and one for standby), and the flow rate of one oxidation fan is 19000m 3 / h (standard state).

[0062] 2. The designed coal sulfur content of the boiler is Sar=2.83%, and the coal burning volume is 160t / h when the boiler is fully loaded. F...

Embodiment 2

[0076] Example 2 Natural oxidation rate test of limestone wet flue gas desulfurization system of No. 1 unit of 2×300MW units in a certain power plant

[0077] 1. The 300MW unit of a power plant in Guangxi adopts a limestone wet flue gas desulfurization system. The absorption tower adopts a liquid column absorption tower (3 slurry circulation pumps). The design value of sulfur content in coal combustion is 1.0%. 2 Concentration FGD inlet design value is 2089mg / m 3 (mark, dry, O 2 6%), the designed flue gas volume is 1,055,494m 3 / h (mark, dry, O 2 6%), which emits SO 2 Concentration allowable discharge standard is less than 100mg / m 3 (mark, dry, O 26%). The forced oxidation air system set up is one tower with two oxidation fans (one for use and one for standby), and the flow rate of one oxidation fan is 3800m 3 / h (standard state).

[0078] 2. The designed coal sulfur content of the boiler is Sar=1.0%, and the coal burning volume is 160t / h when the boiler is fully loade...

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Abstract

The application discloses a method for testing the natural oxidation rate of a limestone wet desulphurization absorption tower slurry. The method comprises the following steps: preparing fire coal which can be combusted in a boiler for 5.8-6.2 hours; adjusting the boiler load to 50% of the maximum output of the boiler, and keeping the stability of the combustion working condition; stopping an oxidation fan of a limestone wet desulphurization system, maintaining the combustion condition of the boiler, keeping the operation parameters of the desulphurization equipment basically unchanged, and performing testing; if the content of CaSO3.1 / 2H2O in the filtered solid of the tower collecting slurry is greater than 1%, ending the test; and calculating the natural oxidation rate of the absorption tower slurry in the test. The embodiment of the invention provides the method for testing the natural oxidation rate of the slurry of the absorption tower, which is simple to operate, high in accuracy and rapid in measurement.

Description

technical field [0001] The invention relates to the field of limestone wet desulfurization, in particular to a method for testing the natural oxidation rate of limestone wet desulfurization absorption tower slurry. Background technique [0002] According to my country's "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011), units of 200MW and above must be equipped with desulfurization devices. According to statistics, more than 95% of domestic thermal power units use limestone-gypsum wet desulfurization technology, and 22 of the 23 thermal power plants in operation in Guangxi use limestone-gypsum wet desulfurization technology. [0003] In limestone-gypsum wet flue gas desulfurization, absorbent limestone (CaCO 3 ) and SO in flue gas 2 The reaction is shown in the following formula: [0004] CaCO 3 +SO 2 +→CaSO 3 .1 / 2H 2 o [0005] CaSO 3 .1 / 2 h 2 O+O 2 =CaSO 4 .2H 2 o [0006] Calcium sulfite CaSO in absorption tower slurry 3 .1 / 2H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00B01D53/80B01D53/50B01D53/34
CPCB01D53/346B01D53/502B01D53/504B01D53/80B01D2251/404B01D2251/606B01D2258/0283G01N31/005
Inventor 林朝扶
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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