High temperature particulate filter media test unit

Claim 1

A device for evaluating the effectiveness of selected metallic high temperature filtering media using a gas stream from the same exhaust stack and at a temperature at which said filtering media will be commercially used, comprising: a probe member insertable into said gas stream to withdraw a gas sample therefrom, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; a gas sample transfer means connected at one end to said probe member for transferring said gas sample from said probe member, said gas sample transfer means including a temperature control means for maintaining said gas sample substantially at said established temperature; a particulate filtering means connected to said gas sample transfer means to receive said gas sample and filter portions of said quantity of particulates therefrom; said particulate filtering means including selected metallic high temperature filtering media to be evaluated, a means for holding said selected metallic high temperature filtering media in the path of said gas sample, means for maintaining said gas stream and said selected metallic high temperature filtering media substantially at said established temperature, and an access means for permitting said selected metallic high temperature filtering media to be conveniently replaced with other selected metallic high temperature filtering media within said holding means to permit a comparison of the effectiveness of different selected metallic high temperature filtering media; and a first means for measuring said established temperature within said exhaust stack, and wherein said temperature control means comprises a second means for measuring the temperature within said particulate filtering means, and a heating means for controlling the temperature within said particulate filtering means in response to the signal from said first and second measuring means.

Claim 2

A device for evaluating the effectiveness of selected metallic high temperature filtering media using a gas stream from the same exhaust stack and at a temperature at which said filtering media will be commercially used, comprising: a probe member insertable into said gas stream to withdraw a gas sample therefrom, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; a gas sample transfer means connected at one end to said probe member for transferring said gas sample from said probe member, said gas sample transfer means including a temperature control means for maintaining said gas sample substantially at said established temperature; a particulate filtering means connected to said gas sample transfer means to receive said gas sample and filter portions of said quantity of particulates therefrom; said particulate filtering means including selected metallic high temperature filtering media to be evaluated, a means for holding said selected metallic high temperature filtering media in the path of said gas sample, means for maintaining said gas stream and said selected metallic high temperature filtering media substantially at said established temperature, and an access means for permitting said selected metallic high temperature filtering media to be conveniently replaced with other selected metallic high temperature filtering media within said holding means to permit a comparison of the effectiveness of different selected metallic high temperature filtering media; and a first means for measuring said established temperature within said exhaust stack, and wherein said temperature control means comprises a second means for measuring the temperature within said particulate filtering means, and a heating means for controlling the temperature within said particulate filtering means in response to the signal from said first and second measuring means.

Claim 6

A device for evaluating the effectiveness of selected high temperature filtering media using a gas stream from the same exhaust stack and at a temperature at which said filtering media will be commercially used, comprising: a probe member insertable into said gas stream to withdraw a gas sample therefrom, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; a gas sample transfer means connected at one end to said probe member for transferring said gas sample from said probe member, said gas sample transfer means including a temperature control means for maintaining said gas sample substantially at said established temperature; a particulate filtering means connected to said gas sample transfer means to receive said gas sample and filter portions of said quantity of particulates therefrom; said particulate filtering means including selected high temperature filtering media to be evaluated, a means for holding said selected high temperature filtering media in the path of said gas sample, means for maintaining said gas stream and said selected high temperature filtering media substantially at said established temperature, and an access means for permitting said selected high temperature filtering media to be conveniently replaced with other selected high temperature filtering media within said holding means to permit a comparison of the effectiveness of different selected high temperature filtering media; a second particulate filtering means for removing additional particulates from said gas stream located downstream of said particulate filtering means; and an impinger means located downstream of said second particulate filtering means for removing additional components from said gas stream; whereby the composition of said gas stream within said exhaust stack can be determined by analysis of the components removed from said gas sample by said particulate filtering means, said second particulate filtering means and said impinger means.

Claim 7

A device for evaluating the effectiveness of selected high temperature filtering media using a gas stream from the same exhaust stack and at a temperature at which said filtering media will be commercially used, comprising: a probe member insertable into said gas stream to withdraw a gas sample therefrom, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; a gas sample transfer means connected at one end to said probe member for transferring said gas sample from said probe member, said gas sample transfer means including a temperature control means for maintaining said gas sample substantially at said established temperature; a particulate filtering means connected to said gas sample transfer means to receive said gas sample and filter portions of said quantity of particulates therefrom; said particulate filtering means including selected high temperature filtering media to be evaluated, a means for holding said selected high temperature filtering media in the path of said gas sample, means for maintaining said gas stream and said selected high temperature filtering media substantially at said established temperature, and an access means for permitting said selected high temperature filtering media to be conveniently replaced with other selected high temperature filtering media within said holding means to permit a comparison of the effectiveness of different selected high temperature filtering media; a second particulate filtering means for removing additional particulates from said gas stream located downstream of said particulate filtering means; and an impinger means located downstream of said second particulate filtering means for removing additional components from said gas stream; whereby the composition of said gas stream within said exhaust stack can be determined by analysis of the components removed from said gas sample by said particulate filtering means, said second particulate filtering means and said impinger means.

Claim 10

A method for evaluating the effectiveness of selected high temperature filtering media by sampling the particulate content of a gas stream in an exhaust stack, comprising the steps of: withdrawing a sample stream from said gas stream in said exhaust stack, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; moving said sample stream from said exhaust stack to a particulate filter means while maintaining the temperature of said sample stream substantially at said established temperature; moving said sample stream through a first high temperature filtering media in said particulate filter means for a predetermined time period while maintaining the temperature of said sample stream substantially at said established temperature, to filter out a first measurable portion of said quantity of particulates from said sample stream at said established temperature; replacing said first high temperature filtering media with a second and different high temperature filtering media; moving said sample stream through said second and different high temperature filtering media for a second predetermined time period while maintaining the temperature of said sample stream at said established temperature to filter out a second measurable portion of said quantity of particulates; comparing said first measurable portion to said second measurable portion to evaluate the relative effectiveness of said first and second high temperature filtering media; moving said sample stream from said particulate filter means to a downstream particulate removal means, said downstream particulate removal means removing substantially all of the remainder of said quantity of particulates from said sample stream at temperature differing from said established temperature; and analyzing the particulates in said particulate filter means and said downstream particulate removal means to determine the particulate content of said gas stream in said exhaust stack.

Claim 11

A method for evaluating the effectiveness of selected high temperature filtering media by sampling the particulate content of a gas stream in an exhaust stack, comprising the steps of: withdrawing a sample stream from said gas stream in said exhaust stack, said gas stream having an established temperature between about 300° F. and about 1500° F. and containing a quantity of particulates therein; moving said sample stream from said exhaust stack to a particulate filter means while maintaining the temperature of said sample stream substantially at said established temperature; moving said sample stream through a first high temperature filtering media in said particulate filter means for a predetermined time period while maintaining the temperature of said sample stream substantially at said established temperature, to filter out a first measurable portion of said quantity of particulates from said sample stream at said established temperature; replacing said first high temperature filtering media with a second and different high temperature filtering media; moving said sample stream through said second and different high temperature filtering media for a second predetermined time period while maintaining the temperature of said sample stream at said established temperature to filter out a second measurable portion of said quantity of particulates; comparing said first measurable portion to said second measurable portion to evaluate the relative effectiveness of said first and second high temperature filtering media; moving said sample stream from said particulate filter means to a downstream particulate removal means, said downstream particulate removal means removing substantially all of the remainder of said quantity of particulates from said sample stream at temperature differing from said established temperature; and analyzing the particulates in said particulate filter means and said downstream particulate removal means to determine the particulate content of said gas stream in said exhaust stack.