Damper: both gas flow regulating button and wind board are high grade PP material, connected with 304 stainless steel bar, manually adjust the outside valve knob, control air flow.

气流调节阀：气流调节扭与挡风板均为高密度PP材质，用304不锈钢方棒连接，手动调节外部阀门旋钮，控制气流量。

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More light oil was obtained through regulating the reaction conditions, such as increasing pressure and gas flow.

通过调整反应条件(如增加反应压力、增大氢气流量)可使多段加氢热解过程中所得焦油进一步轻质化。

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