Sampling device and method

Abstract

The invention provides a sampling device and method. The sampling device comprises a probe, an exhaust pipe, a treatment channel, a temperature control unit, a switching unit, a pressure detector, a comparison module and a processor, wherein the treatment channel comprises a first channel and a second channel which are connected in parallel; the temperature control unit adjusts the temperature inthe first channel and the temperature in the second channel; the switching unit is used for enabling sampling fluid to be delivered to the exhaust pipe through the first channel or the second channelselectively; the pressure detector is used for detecting the pressure difference of the treatment channel; the comparison module is used for comparing pressure difference to a threshold value, and transmitting a comparison result to the processor; and the processor controls the switching unit to select the channels according to the comparison result. The sampling device has the advantages of rapidswitching, intelligence, short consumed time and the like.

Description

technical field [0001] The invention relates to fluid sampling, in particular to a sampling device and method. Background technique [0002] During the online analysis of coke oven gas, tar, benzene, naphthalene, and moisture in coke oven gas are easy to condense and crystallize to block the pipeline, which seriously affects the normal operation of the online analysis system and increases the maintenance cost of the analysis system. Therefore, it is necessary to condense the analysis sample gas through the pretreatment sampling probe to remove tar, benzene, naphthalene, and water in the sample gas. [0003] The current sampling methods are mostly: the sample gas passes through the sampling probe, and the sampling probe passes through the condenser to control the temperature at 5-7°C to remove most of the benzene, naphthalene, tar, and water in the sample gas. The main disadvantages of this approach are: [0004] The tar, benzene, naphthalene and other crystals cooled by th...

AI Technical Summary

Problems solved by technology

[0004] The tar, benzene, naphthalene and other crystals cooled by the probe condenser are easy to block the condenser pipeline. When the condenser pipeline is blocked, the blockage cannot be removed by the probe back blowing, which affects the normal sampling of the probe;

[0005] After the probe is heated and blown back, the probe is re-cooled with normal temperature blowback air. This method takes a long time to cool down and is inefficient, and it is easy to cause the probe to be sampled before reaching the cooling target temperature.

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