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Device and method for sampling SO3 in flue gas of coal-fired unit

A technology of sampling device and coal-fired unit, applied in sampling device, measuring device, sampling and other directions, can solve the problems of short lifespan of sampling tube, low sampling efficiency, easy entry of particulate matter into sampling tube, etc., so as to reduce sampling loss and improve sampling efficiency, reducing the effect of fly ash deposition on the tube wall

Pending Publication Date: 2021-07-16
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the existing SO 3 The sampling method has low sampling efficiency, and particles are easy to enter the sampling tube, resulting in a short life of the sampling tube

Method used

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  • Device and method for sampling SO3 in flue gas of coal-fired unit
  • Device and method for sampling SO3 in flue gas of coal-fired unit
  • Device and method for sampling SO3 in flue gas of coal-fired unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] SO in the flue gas of a coal-fired unit 3 sampling devices such as figure 1 As shown, it includes: sampling gun rod 2, depth positioning ring 3, heating box 4, serpentine collection tube 5, gas washing bottle 6, sampling pump (chemical titration sampling pump) 8, ice bath box 9, water bath heating box 10, temperature controller 13; wherein the sampling gun rod 2 is provided with a depth positioning ring 3, and the sampling gun rod 2 is provided with a sliding device matched with the depth positioning ring 3, and the depth positioning ring 3 can slide to a specific position on the sampling gun rod 2; The gun shaft 2 is also provided with a locking valve, which is used to fix the depth positioning ring 3 on the sampling gun shaft 2; the sampling gun shaft 2 is connected in series with the membrane filter 12 and the front three-way valve 11 in the heating box 4; the temperature controller 13 Connect the sampling gun rod 2 and the heating box 4; the heating box 4 exposes t...

Embodiment 2

[0039] On the basis of Example 1, SO in the flue gas of a coal-fired unit 3 The working method of the sampling device specifically comprises the following steps:

[0040] Step 1, start the sampling pump 8, check the air tightness of the sampling device, and arrange the sampling points according to the sampling standard after the sampling device has no abnormal air tightness; slide the depth positioning ring 3 (diameter 200mm) on the sampling gun rod 2 to the set point. Fix the position, use the locking valve to fix the depth positioning ring 3 on the sampling gun rod 2, the depth positioning ring 3 is used to locate the depth of the sampling point and can be used to seal the sampling hole to avoid the large swing of the gun body during the sampling process;

[0041] Step 2. Insert the sampling gun rod 2 into the sampling hole as a whole to ensure that the sampling hole is well sealed; heat all the silica gel in one group of absorption units 14 connected to the outlet of the pr...

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Abstract

The invention relates to a device for sampling SO3 in flue gas of a coal-fired unit. The device comprises a sampling gun barrel, a depth positioning ring, a heating box, a snakelike collecting pipe, a gas washing bottle, a sampling pump, an ice bath box, a water bath heating box and a temperature controller, a depth positioning ring is arranged on the sampling gun barrel, a sliding device matched with the depth positioning ring is arranged on the sampling gun barrel, and the depth positioning ring can slide to a specific position on the sampling gun barrel; a locking valve is also arranged on the sampling gun barrel and is used for fixing the depth positioning ring on the sampling gun barrel. The device has the beneficial effects that the snakelike collecting pipe is arranged, so that the SO3 sampling loss amount is reduced; the two groups of absorption units are connected in series to complement each other to improve the SO3 trapping efficiency; the sampling connection component structure is optimized, and the manual sampling time is shortened; a parallel gas circuit structure is utilized, and gas circuit switching is completed through a valve switch; particulate matters can be prevented from entering the sampling pipe, fly ash deposition on the pipe wall is reduced, cleanliness in the sampling pipe is guaranteed, and the service life of the sampling device is prolonged.

Description

technical field [0001] The invention belongs to the field of flue gas sampling of coal-fired units, in particular to a kind of SO2 in the flue gas of coal-fired units 3 Sampling device and method. Background technique [0002] Coal-fired power plant SO 3 Mainly from the generation in the furnace and the generation in the denitrification system, SO 3 Not only will it increase the corrosion of the metal wall, it will react with the excess ammonia gas in the denitrification process to form ammonium bisulfate, and it will also form condensable particles that will be discharged into the atmosphere to form secondary pollution. In the study of ammonium bisulfate and condensable particulate matter, SO 3 The accurate determination of is one of the research difficulties. The accuracy and reliability of the data mainly depend on the rationality and effectiveness of the process of sampling and sample analysis, SO 3 The difficulty of sampling is that it is easily interfered by other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24
CPCG01N1/2258G01N1/2214G01N2001/2217
Inventor 陈彪吴贤豪梁成思陈雨帆王维平陈臻冯向东王洁童小忠
Owner ZHEJIANG ZHENENG TECHN RES INST
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