Industrial and civil dryer
Type B uses the national standard GB7148-81 and the international ISO7150/1-1948 standard salicylic acid photometric method as the basic test means, supplemented by sample colorimetric reaction pretreatment, to achieve rapid and accurate colorimetric determination of samples, with stable,SensitiveReliable and mercury-free.
Dryers can be divided into industrial and civil two, industrial dryer is also called drying equipment or dryer, civil dryer is a kind of washing machinery, generally after water washing and dehydration, used to remove moisture in clothing and other textiles.
The dryer has several modes such as belt drying, drum drying, box drying and tower drying. The heat sources include coal, electricity, gas, etc. There are hot air flow type and radiation type for materials in the drying process. Hot air drum drying is that the hot air flow moves forward from the tail, fully contacts with the materials, and makes full use of heat transfer through heat conduction, convection and radiation. Heat energy is directly transferred to materials, the moisture of the material is continuously evaporated in the cylinder, and the air inducing device at the material inlet draws out a large amount of moisture and wet air flow to prevent secondary pollution caused by dust discharge. Through internal spiral stirring, sweeping and plate copying, the material movement is promoted to complete the whole drying process. Countercurrent conduction dehumidification avoids reducing repeated drying procedures.
Key words: heat exchange equipment
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Type of ammonia nitrogen analyzer
Ammonia nitrogen analyzer according to the different test standards, there are A, B type. Type A is GB7479-87 by Nessler' s reagent colorimetric method. Type B adopts the national standard GB7148-81 and the salicylic acid photometric method specified in the international ISO7150/1-1948 as the basic testing method, supplemented by the sample colorimetric reaction pretreatment, to realize the rapid and accurate colorimetric determination of the sample, which has the advantages of stability, sensitivity, reliability and mercury-free.
Operation steps of ammonia nitrogen analyzer
Pour distilled water or ultra-pure water into a cuvette (about 2/3 height); wipe the water marks and fingerprints on the outer wall with a non-falling paper towel or soft cloth, then put it into the measuring seat of the instrument and cover the shading cover.
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