Mercury Sampling and Measurement in Coal-Fired Power Plants - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 10

2

Mercury Sampling and Measurement in
Coal-Fired Power Plants

2.1 Introduction

Fossil-fuel combustion is the major anthropogenic emission source of mercury. In
China, a coal-fired power plant is the most common method of producing electric
energy. Numerous studies have been conducted to research the characteristics of
mercury emissions from the coal-fired power plants in China. Many factors, such as
the amount and type of coal, the manner of combustion, the conventional pollut-
ant-control devices, will affect the mercury emission for its special physi-
cal-chemical characteristics. In order to study the mercury sampling and meas-
urement in coal-fired electric power plants in China, 6 sets of typical coal-fired
boiler systems were chosen. The basic conditions of these boiler systems are shown
in Table 2.1.

Table 2.1 Basic conditions of 6 typical coal-fired boiler systems

Unit
capacity
(MW)

Combustion
method

Mercury in
coal (mg/kg)

Pollutant control
device

No. Location Coal type

Shenhua
mixed coal

1 Zhejiang 300 Four-corner 0.145 ESP

Front and
back walls

Shenhua
mixed coal

2 Zhejiang 600 0.161 ESP

Zhun'ge'er
mixed coal

3 * ESP+WFGD+LNB ** Beijing 2*100 Four-corner 0.088

4 Jiangsu 300 Four-corner Shanxi coal 0.208 ESP

Huibei
mixed coal

5 Anhui 300 Four-corner 0.188 ESP+WFGD

Jingbei

mixed coal 0.140 SCR+ESP+WFGD ***
Note: * Both 100 MW boilers with two ESPs and one WFGD; ** Lower NO x burner; *** WFGD with sea water

6 Fujian 300 Four-corner