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Determination method of air pre-heater bulkhead ammonium bisulfate

A technology of ammonium bisulfate and determination method, which is applied in the direction of weighing by removing certain components, can solve the problem of increased resistance of the wind and smoke system of coal-fired units, difficulty in ensuring safe and reliable operation of units, and corrosion of heat exchange elements of air preheaters and other problems, to achieve the effect of simple and efficient measurement calculation method, simple and efficient data processing process, and solve the problem of ash plugging

Pending Publication Date: 2022-03-11
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] The upgrading of coal-fired power generation technology is developing in the direction of greenness, flexibility, and reliability. The air preheater is a surface heat exchanger that improves the heat exchange performance of the boiler and reduces heat loss. While the unit is denitrating efficiently, air preheater clogging incidents frequently occur, resulting in an increase in the pressure difference of the air preheater, resulting in an increase in the resistance of the air and smoke system of the coal-fired unit, resulting in an increase in wind power consumption, and it is even difficult to ensure safe and reliable operation of the unit. Studies have shown that part of the ammonium bisulfate is the main cause of the production, so accurate and rapid detection of ammonium bisulfate in the ash is helpful to solve the ash plugging problem of the hollow preheater in actual production
[0003] At present, due to the limitation of geographical location or the reduction of technical cost of operation, the type of coal fed into the furnace during the operation of thermal power plant units is far from the type of coal at the time of design, and the SO produced in the flue gas 3 Sulfuric acid vapor is formed with water vapor, and the sulfuric acid vapor causes the acid dew point in the flue gas to rise. If the sulfur content of the incoming coal is high, the acid dew point of the flue gas will inevitably rise. When the acid dew point is higher than the exhaust gas temperature, the air preheater will be cold. Dew condensation on the heat exchange components at the end, in severe cases, causes corrosion of the heat exchange elements of the air preheater, and ammonium bisulfate is formed at the outlet of the air preheater, which deposits on the surface of the heat exchanger to gradually block the air preheater and increase the resistance of the flue gas system. , the flue gas treatment process is boiler→SCR catalyst→air preheater→dust collector, the escaped NH in the SCR denitrification device 3 gas and SO in flue gas 3 and H 2 O reacts to form NH 4 HSO 4 , with the decrease of flue gas temperature, NH 4 HSO 4 It will condense into a liquid state, and the high dust concentration in the flue gas will intensify the adsorption and mixing of ammonium bisulfate and ash and adhere to the surface of the air preheater together, resulting in the blockage and corrosion of the air preheater, which will increase the power consumption of the three major fans of the boiler , so accurate and rapid detection of ammonium bisulfate in the ash will help to solve the problem of ash plugging in hollow preheaters in actual production

Method used

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  • Determination method of air pre-heater bulkhead ammonium bisulfate
  • Determination method of air pre-heater bulkhead ammonium bisulfate
  • Determination method of air pre-heater bulkhead ammonium bisulfate

Examples

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Effect test

Embodiment 1

[0049] Accurately weigh 0.95g of an air-dried ash sample with a particle size of less than 0.2mm, put it into a beaker, add 0.7mL of ethanol to moisten it, then add 50mL of dilute hydrochloric acid solution, cover with a watch glass, shake well, heat on an electric heating plate, and slightly boil 38min. After cooling down slightly, first filter through slow qualitative filter paper by pouring method, wash the ash sample with hot water (70°C) several times, then transfer all the ash sample to the filter paper, and wash with hot water (70°C) until there is no iron ion (Check with potassium thiocyanate solution, if the solution is colorless, it means there is no iron ion).

[0050] If there is ash sample passing through the filter paper during filtration, filter again. If the filtrate is yellow, add 0.1g of zinc powder, heat slightly to make the yellow disappear, then filter, and wash with water until there is no chloride ion (check with silver nitrate solution, if The solution...

Embodiment 2

[0053] Accurately weigh 1g of an air-dried ash sample with a particle size of less than 0.2mm, put it into a beaker, add 0.5mL of ethanol to moisten it, then add 50mL of dilute hydrochloric acid solution, cover with a watch glass, shake well, heat on an electric heating plate, and boil slightly for 30min . After cooling down slightly, first filter through slow qualitative filter paper by pouring method, wash the ash sample with hot water (80°C) several times, then transfer all the ash sample to the filter paper, and wash with hot water (80°C) until there is no iron ion (Check with potassium thiocyanate solution, if the solution is colorless, it means there is no iron ion).

[0054] If there is ash sample passing through the filter paper during filtration, then re-filter, if the filtrate is yellow, add 0.1g of aluminum powder, heat slightly to make the yellow disappear, then filter, wash with water until there is no chloride ion (check with silver nitrate solution, if The solu...

Embodiment 3

[0057] Accurately weigh 1.1g of an air-dried ash sample with a particle size of less than 0.2mm, put it into a beaker, add 1mL of ethanol to moisten it, then add 50mL of dilute hydrochloric acid solution, cover with a watch glass, shake well, heat on an electric heating plate, and boil slightly for 40min . After cooling down slightly, first filter through slow qualitative filter paper by decanting method, wash the ash sample several times with hot water at 50°C, then transfer all the ash samples to the filter paper, and wash with hot water at 50°C until there is no iron ion (with sulfur Check the potassium cyanate solution, if the solution is colorless, it means that there is no iron ion).

[0058] If there is ash sample passing through the filter paper during filtration, filter again. If the filtrate is yellow, add 0.1g of zinc powder, heat slightly to make the yellow disappear, then filter, and wash with water until there is no chloride ion (check with silver nitrate solutio...

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Abstract

The invention discloses a determination method of air pre-heater bulkhead ammonium bisulfate, and belongs to the technical field of coal-fired power generation. The determination method comprises the following steps: boiling a coal sample with hydrochloric acid, leaching sulfate in the coal sample, and generating a barium sulfate precipitate; calculating the mass fraction of the sulfate sulfur according to the mass of the generated barium sulfate precipitate, and calculating the content of ammonium bisulfate according to the mass fraction of the sulfate sulfur; the calculation formula of ammonium bisulfate is NH4HSO4 (%) = Ss, ad * 3.5938; in the formula, Ss and ad are mass fractions,%, of sulfate sulfur in the coal sample; and 3.5938 is the conversion coefficient of the sulfate sulfur and the ammonium bisulfate. The method provided by the invention solves the problem of ash clogging of the air pre-heater in actual production, and ensures safe operation of the boiler.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation, and relates to a method for measuring ammonium bisulfate, which is a blockage of an air preheater. Background technique [0002] The upgrading of coal-fired power generation technology is developing in the direction of greenness, flexibility, and reliability. The air preheater is a surface heat exchanger that improves the heat exchange performance of the boiler and reduces heat loss. While the unit is denitrating efficiently, air preheater clogging incidents frequently occur, resulting in an increase in the pressure difference of the air preheater, resulting in an increase in the resistance of the air and smoke system of the coal-fired unit, resulting in an increase in wind power consumption, and it is even difficult to ensure safe and reliable operation of the unit. Studies have shown that part of the ammonium bisulfate is the main cause, so accurate and rapid detection of am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 吴颖庆
Owner XIAN THERMAL POWER RES INST CO LTD