The invention relates to a device for performing
flue gas mercury concentration measurement by utilizing modified
fly ash. The device comprises a dust removal device, an adsorption tube, a
temperature control device, a
tail gas treatment device, a flow control device and an
atmosphere control device. During measurement,
flue gas sequentially flows through dust removal device, the adsorption tube and the
tail gas treatment device. In the adsorption tube, gas-phase mercury in the
flue gas is absorbed by a special modified
fly ash adsorbent. The
atmosphere of an adsorption environment is controlled by the
atmosphere control device in the process that the
flue gas passes through the adsorption tube. The
temperature control is performed by the
temperature control device in the process that the
flue gas passes through the dust removal device and the adsorption tube. The content of the mercury in the adsorbent is analyzed by utilizing a
neutron activation
analysis method or the content of the mercury in a filtrate is analyzed by utilizing a cold atomic absorption spectrometry or a cold
atomic fluorescence spectrometry after the adsorbent is leached with acid liquor. The device provided by the invention has the benefit that the adsorption atmosphere is controlled by adopting the atmosphere control device, so that the adsorption efficiency of the cheap adsorbent is improved, and while the cost is reduced, the
flue gas mercury concentration measurement accuracy is ensured.