Method and device for removing mercury

A mercury removing device that removes mercury from exhaust gas that contains nitrogen oxide, sulfur oxide, the mercury removing device comprising:

• a gasification unit that converts a non-gaseous-mercury-chlorinating agent, which is non-gaseous at room temperature and normal pressure, into gaseous-mercury-chlorinating agent by heating the non-gaseous-mercury-chlorinating agent with heat of hot air generated by using the exhaust gas or hot air generated by using an air heater installed in a flue that conveys the exhaust gas;
• a mercury-chlorinating-agent supply unit that supplies the gaseous-mercury-chlorinating agent to the exhaust gas in the flue thereby obtaining agent-added exhaust gas;
• a selective catalytic reducer that performs selective catalytic reduction on the agent-added exhaust gas by using a solid catalyst thereby obtaining denitrated exhaust gas;
• and
• a desulfurization unit that performs wet desulfurization on the denitrated exhaust gas by using an alkali absorbing solution thereby obtaining desulfurized exhaust gas.