求翻译：锅炉点火后，应缓慢升温（升温至安全阀冒汽应不能低于两小时），当蒸汽从空气阀冒汽时即关闭空气阀，此时方可增加风压和加煤量，准备升温；是什么意思？

After the ignition of the boiler, should be slow warming (heating safety valve steaming should not be less than two hours), when the steaming vapor from the air valve to close the air valve, then be to increase the pressure and the amount of coal, ready to heat up;

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After the boiler ignition, should elevate temperature (to brave steam slowly elevation of temperature to safety valve to be supposed not to be able to be lower than for two hours), when the steam braves the steam from the air cock namely closes the air cock, this time only then increases the wind pr

After ignition of the boiler should be slowly warming (warming up to steam safety valve shall be not less than two hours), when the air valve of steam from the steam is off air valve, you can increase the amount of air pressure and coal, ready to heat up;