Device and method for collecting trace sulfur trioxide in industrial gas
An industrial gas and sulfur trioxide technology, applied in measuring devices, sampling devices, sampling, etc., can solve problems such as low efficiency of sulfur trioxide testing, complex structure of the measuring system, inaccurate measurement results, etc., and achieve easy replacement and simplified sampling system, reducing the effect of sampling loss
Active Publication Date: 2021-02-26
TSINGHUA UNIV +1
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Problems solved by technology
[0007] The purpose of the present invention is to provide a device and method for collecting trace amounts of sulfur trioxide in industrial gases, aiming to solve the problem of complex structure and large sampling loss in the measurement system of trace amounts of sulfur trioxide in industrial gases in metallurgy, electric power, chemical industry, building materials and other industries. Technical defects, while solving problems such as low efficiency of sulfur trioxide testing and inaccurate measurement results
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[0030] The principle structure and working process of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0031] see figure 2 with image 3 , a device for collecting trace amounts of sulfur trioxide in industrial gases provided by the present invention, the device includes a sampling tube 19, an isokinetic sampler 22, a temperature control device 24 and an absorption bottle 28; the tube 19 and the isokinetic sampler The pitot tube 20 is placed in the industrial gas; the temperature control device 24 is respectively connected with the heating wire and the thermocouple arranged in the sampling tube through the signal line 25 .
[0032] The sampling pipe 19 includes an outer protective sleeve 34 and a sampling inner pipe 43; the sampling inner pipe 43 is divided into two parts, an air inlet pipe section and an air outlet pipe section, and the outside of the air inlet pipe section is covered with a sealing pipe 3...
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The invention relates to a device and a method for collecting trace sulfur trioxide in industrial gas. The device comprises a sampling tube, a constant-speed sampler, a temperature control device andan absorption bottle, and the sampling tube is an adsorption and desorption integrated sampling tube. The method is divided into an adsorption stage and a desorption stage. During adsorption, the sampling tube is put into industrial gas and heated to a certain temperature, the industrial gas is extracted by using a constant-speed sampler, and particles and sulfur trioxide in the gas are intercepted by fiber winding wires and adsorbed by an adsorption medium respectively. During desorption, nitrogen or inert gas is used for purging the sampling tube at a high temperature, and purged gas is introduced into the absorption bottle filled with a saline solution for collection and absorption. Due to the adoption of the integrated sampling tube, a sampling system is simplified, and the phenomenonof air leakage caused by excessive interfaces is reduced; and meanwhile, sulfur trioxide is collected by using a gas purging method, no cleaning dead zone appears, the sampling error is reduced, the sampling precision is improved, and the operations of cleaning, drying and the like on parts are not needed in the later period.
Description
technical field [0001] The invention relates to a device and method for collecting trace amounts of sulfur trioxide in industrial gases, belonging to the technical field of air pollution and control. Background technique [0002] Sulfur trioxide is a very harmful air pollutant, which is commonly found in the tail gas emitted by industries such as electric power, chemical industry, metallurgy, and building materials. The treatment and detection of this pollutant are highly valued by the industry. [0003] Conventional methods represented by the US EPA 8 method usually use impact adsorption, solution absorption, enrichment and other methods to prepare samples for sulfur trioxide or sulfuric acid mist when detecting such pollutants, and the prepared solutions are used for laboratory analysis. Due to the constraints of strong corrosiveness, adsorption, chemical instability and low content of sulfur trioxide and sulfuric acid mist, problems such as adsorption, air leakage and che...
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IPC IPC(8): G01N1/22
CPCG01N1/2214G01N2001/2217
Inventor 常东武李鹏飞董源
Owner TSINGHUA UNIV