Sampling and detection system and method of sulfur trioxide in coal fired boiler smoke gas

Abstract

The invention discloses a sampling and detection system and method of sulfur trioxide in coal fired boiler smoke gas. The system comprises a heating sampling gun, a heating filter, an electric heat tracing pipe, a condensation pipe, a constant temperature water bath box, a gas washing bottle and a vacuum pump, wherein a coiled pipe is arranged in the condensation pipe; a gun head of the heating sampling gun is positioned in a flue; an outlet of the heating sampling gun sequentially passes through the heating filter and the electric heat tracing pipe to be connected with one end of the coiled pipe; the other end of the coiled pipe is communicated with an inlet of the gas washing bottle; an outlet of the gas washing bottle is communicated with an inlet of the vacuum pump; a wet type flowmeter and an air pressure meter are arranged between the gas washing bottle and the vacuum pump; the constant temperature water bath box is communicated with the condensation pipe. The system and the method can accurately detect the concentration of SO3 in the smoke gas.

Description

technical field [0001] The invention belongs to the technical field of pollutant sampling and detection, and relates to a sampling and detection system and method for sulfur trioxide in flue gas of a coal-fired boiler. Background technique [0002] my country's coal consumption ranks first in the world, about half of which is used for power plant boilers. Sulfur in coal forms a small amount of SO during combustion 3 pollutants. SO 3 Although the content in the flue gas is small, it will significantly increase the acid dew point of the flue gas, and combine with the water vapor in the flue gas to form H 2 SO 4 , will cause serious low-temperature corrosion to the equipment downstream of the air preheater and the flue, and the NH that escapes from the SCR denitrification device 3 combined to form NH 4 HSO 4 Blocking the air preheater will affect the safety of boiler operation. In order to reduce the low-temperature corrosion of the downstream equipment and flue of the ...

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Problems solved by technology

The controlled condensation method recommended by the current electric power standard DL / T998-2006 has many implementation details that are likely to cause operational errors, such as the use of quartz wool for filtration, the heating temperature of the flue gas sampling position is only 150°C, and the failure to control the flue gas flow for pressure correction, etc., SO 3 There is a large error in the test results

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