Temperature-controlled exhaust particulate collection system for high temperature material processing facility

In a temperature-controlled exhaust particulate collection system coupled to a high temperature material processing facility producing a particulate-laden exhaust gas flow and having an afterburner operable at a minimum temperature for combusting gaseous by-products in said exhaust gas flow, said collection system comprising:

• a plurality of devices for receiving said exhaust gas flow from said facility and separating and collecting particulates therefrom prior to release of said exhaust gas flow to the atmosphere, one of said devices including a plurality of filter bags;
• a plurality of gas flow ducts interconnecting said devices so as to arrange said devices in series and in flow communication with one another and with said exhaust gas flow from said facility;
• means coupled in flow communication to one of said ducts upstream of said one device having said filter bags and being operable for permitting entering and mixing of a cooling gas into said exhaust gas flow to reduce the temperature thereof;
• means for inducing movement of said exhaust gas flow from said facility through said gas flow ducts and said separating and collecting devices;
• and
• means coupled to one of said ducts for sensing the temperature of said exhaust gas flow downstream of said facility and upstream of said one device having said bag filters and for controlling operation of said cooling gas entering and mixing means to permit said cooling gas to enter and mix with said exhaust gas flow to reduce the temperature thereof in response to the temperature sensed being above a preset maximum temperature.

In a temperature-controlled exhaust particulate collection system coupled to a high temperature material processing facility producing a particulate-laden exhaust gas flow, said collection system comprising:

• a plurality of devices for receiving said exhaust gas flow from said facility and separating and collecting particulates therefrom prior to release of said exhaust gas flow to the atmosphere, one of said devices including a plurality of filter bags;
• a plurality of gas flow ducts interconnecting said devices so as to arrange said devices in series and in flow communication with one another and with said exhaust gas flow from said facility;
• one of said devices comprising a spray cooler means for spraying water on said exhaust gas flow to reduce the temperature of said exhaust gas flow and to remove larger particulates;
• means for inducing movement of said exhaust gas flow from said facility through said gas flow ducts and said separating and collecting devices;
• means coupled to one of said ducts for sensing the temperature of said exhaust gas flow downstream of said facility and upstream of said one device having said bag filters and for controlling operation of said flow inducing means to terminate the same in response to the temperature sensed being above a preset maximum temperature;
• and
• one of said devices comprising a bleed damper means including means for mixing cooler air with said exhaust gas flow in response to the exhaust gas temperature.

In a temperature-controlled exhaust particulate collection system coupled to a high temperature material processing facility producing a particulate-laden exhaust gas flow, said collection system comprising:

• a plurality of devices for receiving said exhaust gas flow from said facility and separating and collecting particulates therefrom prior to release of said exhaust gas flow to the atmosphere, a first one of said devices being a spray cooler located immediately downstream of said facility;
• another of said devices being a bag filtering apparatus located downstream of said spray cooler;
• means connected to said spray cooler and being operable for supplying a cooling fluid thereto and for spraying the same on said exhaust gas flow as it passes through said spray cooler;
• a plurality of gas flow ducts interconnecting said devices so as to arrange said devices in series and in flow communication with one another and with said exhaust gas flow from said facility;
• means for inducing movement of said exhaust gas flow from said facility through said gas flow ducts and said separating and collecting devices;
• means coupled to one of said ducts for sensing the temperature of said exhaust gas flow immediately downstream of said spray cooler and for controlling operation of said cooling fluid supplying and spraying means in response to the temperature sensed being above a preset maximum temperature;
• and
• means operable for opening an exhaust end of said facility located upstream of said spray cooler to permit said exhaust gas flow to bypass all of said devices;
• said temperature sensing means also controlling operation of said facility exhaust end opening means to permit said exhaust gas flow to bypass all of said devices in response to the temperature sensed being above a second preset maximum temperature being higher than said preset maximum temperature.

In a temperature-controlled exhaust particulate collection system coupled to a high temperature material processing facility producing a particulate-laden exhaust gas flow, said collection system comprising:

• a plurality of devices for receiving said exhaust gas flow from said facility and separating and collecting particulates therefrom prior to release of said exhaust gas flow to the atmosphere;
• a plurality of gas flow ducts interconnecting said devices so as to arrange said devices in series and in flow communication with one another and with said exhaust gas flow from said facility;
• a fan for inducing movement of said exhaust gas flow from said facility through said gas flow ducts and said separating and collecting devices;
• an electric motor for powering said fan;
• means operable for regulating exhaust gas flow at an outlet of said fan;
• and
• means coupled to said motor for sensing the electrical load on said motor in operating said fan and coupled to said flow regulating means for controlling operation of said flow regulating means in response to the load sensed to regulate exhaust gas flow through said fan outlet to prevent overload of said motor at cold startup of said fan.