System and method for detecting measurement accuracy of sulfur trioxide and sulfuric acid steam in flue gas

A technology of sulfur trioxide and detection system, which is applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of no standard gas and no evaluation of steam, and achieve the purpose of improving the accuracy of measurement, ensuring stability and ensuring evaporation effect. Effect

Pending Publication Date: 2021-06-29
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SO 3 / H 2 SO 4 There is no standard gas for steam, and there is no evaluation of SO in the environmental protection industry 3 / H 2 SO 4 Reference source for steam measurement accuracy and accuracy detection system and method

Method used

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  • System and method for detecting measurement accuracy of sulfur trioxide and sulfuric acid steam in flue gas
  • System and method for detecting measurement accuracy of sulfur trioxide and sulfuric acid steam in flue gas
  • System and method for detecting measurement accuracy of sulfur trioxide and sulfuric acid steam in flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The diameter of the capillary 4 adopted in this embodiment is 0.5 mm, the inner diameter of the evaporation tube 5 is 10 mm, the diameter of the circular buffer device 9 is 30 mm, the temperature of the first section temperature control zone of the heating furnace 6 is 300 ° C, the second section The temperature in the temperature control zone is 350°C, and the temperature in the third temperature control zone is 300°C; the heat preservation device 7 at the outlet of the evaporator tube 5 controls the outlet smoke temperature to 300°C, and the capillary tube 4 is inserted into the circular buffer device 9 of the evaporator tube 5 at the far left side. Arranged in the evaporating tube 5 such as figure 2 A turbulent mixing device 10 composed of several plates is shown.

[0070] In actual use, the flue gas flow rate of the simulated flue gas on the test bench is 5L / min, the concentration of the prepared dilute sulfuric acid is 0.97g / L; the delivery speed of the pump 2 is...

Embodiment 2

[0075] The parameters of each structure adopted in this embodiment are as described in Embodiment 1.

[0076] In actual use, the total gas volume of the simulated flue gas on the test bench is 1.5L / min, and the concentration of the prepared dilute sulfuric acid is 0.97g / L. Adjust the delivery speed of pump 2 to 0.10ml / min, and the delivery time to 30min.

[0077] Dilute sulfuric acid was evaporated under the above conditions, and SO in the prepared simulated flue gas 3 / H 2 SO 4 The vapor reference concentration can be obtained by the formula:

[0078] (0.97g / L×0.10ml / min)×1000 / 1.5L / min=64.67mg / m 3

[0079] pass figure 1 as shown in SO 3 Measuring device 8, SO in the present embodiment 3 The measuring device 8 adopts the isopropanol absorption method to sample and measure, and measure and calculate the SO in the flue gas 3 / H 2 SO 4 The steam concentration is 47.86mg / m 3 . SO obtained from the above calculation 3 / H 2 SO 4 Vapor concentration reference value 64...

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Abstract

The invention provides a system and a method for detecting the measurement accuracy of sulfur trioxide and sulfuric acid steam in flue gas. The system is reasonable in design, simple in structure, convenient in detection and reliable in result. The system comprises a heating furnace, an evaporation tube penetrating through the heating furnace, a capillary tube arranged in the evaporation tube, and a dilute sulphuric acid bottle and a simulated flue gas bottle which are arranged at the input end of the evaporation tube; a circular buffer device is arranged in the middle of the evaporation pipe; the dilute sulphuric acid bottle is connected with the input end of the capillary through the pump; the other end of the capillary extends into the inlet of the circular buffer device through the input end of the evaporation pipe; a flue gas flow control valve is arranged on the simulated flue gas cylinder; the heating furnace adopts a three-section temperature control heating furnace, and is sequentially provided with a first-section temperature control area for preheating dilute sulphuric acid, a second-section temperature control area for completely evaporating the dilute sulphuric acid and a third-section temperature control area for preserving heat of SO3 / H2SO4 steam from an inlet to an outlet; and the circular buffer device is positioned in the second-section temperature control area.

Description

technical field [0001] The invention relates to a measurement method for judging sulfur trioxide and sulfuric acid vapor in flue gas, in particular to a detection system and method for measuring accuracy of sulfur trioxide and sulfuric acid vapor in flue gas. Background technique [0002] SO in the flue gas of coal-fired units 3 It is easy to cause corrosion of boiler piping equipment, and in recent years, coal is scarce, and many power plants are mixed with high-sulfur coal to generate electricity, which is likely to cause more serious corrosion problems of boiler piping equipment; in addition, SO emitted from chimneys 3 It is an important precursor for the formation of PM2.5, which is easy to cause atmospheric smog. Coal-fired, SO 3 The chemical properties are very active, and it is easy to combine with water vapor in its environment to form H 2 SO 4 steam. According to literature reports, when the temperature is lower than 200°C, SO in flue gas 3 Almost all start wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/0036G01N33/0042
Inventor 付康丽赵瀚辰王定帮陆续杨成龙蔡铭聂思聪杨嵩李阳
Owner XIAN THERMAL POWER RES INST CO LTD
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