| 摘要 |
<p>PURPOSE:To reduce not only the shaft power of a recirculation pump but also operation cost, by controlling the recirculation quantity of the recirculation agent in an absorbing system, a cooling/dust removing system or both systems corresponding to the signal participated in the amount of exhaust gas. CONSTITUTION:Corresponding to the output signal of a boiler load signal generator 21, the recirculation quantity of an absorbing system, the recirculation quantity of a cooling/dust removing system and the concn. of dust are respectively outputted by function generators 25, 26, 27 while the actual recirculation quantity of the slurry of the absorbing system, the concn. of dust at the outlet of a desulfurization apparatus and the actual recirculation quantity of the cooling system are respectively proportionally outputted by transmitters 22, 23, 24. The output values are operated to output signals for controlling the opening degrees of an absorbing part recirculation flow control valve 12 and a cooling/ dust removing part recirculation flow control valve 15. By this method, the recirculation quantity corresponding to the load of a boiler is obtained and the shaft power of a cooling tower pump is reduced.</p> |
