Constant temperature cold-end corrosion probe

Claim 2

A CONSTANT TEMPERATURE COLD-END CORROSION PROBE FOR DETERMINING THE CORROSION RATE OF THE FLUE GAS STREAM IN THE COLD END OF A BOILER, SAID PROBE COMPRISING A PIPE LOOP HAVING AN UPPER RUN AND A LOWER RUN, SAID RUNS BEING ARRANGED IN A VERTICAL PLANE AND SAID LOOP ADAPTED FOR INSTALLATION IN THE FLUE GAS STREAM HAVING A TUBULAR CORROSION SPECIMEN, A TANK MOUNTED OUTSIDE THE FLUE GAS STREAM AND CONNECTED TO BOTH ENDS OF SAID PIPE LOOP COOLANT IN THE TANK HAVING A BOILING POINT ORGANIC SOLVENT TYPE COOLANT IN THE TANK HAVING A BOILING POINT ABOUT THE SAME AS THAT WHERE MAXIMUN CORROSION WOULD OCCUR FOR THE SPECIMEN, AND COOLING MEANS IN THE TANK MAINTAINING THE COOLANT AT A TEMPERATURE BELOW THE BOILING P0INT THEREBY PRODUCING CIRCULATION THROUGH THE PIPE LOOP AND MAINTINING THE TEMPERATURE OF THE SPECIMEN CONSTANT AT ABOOUT THE BOILING POINT OF THE COOLANT.

Claim 3

The combination as defined in claim 1, wherein the organic solvent level is above said ports, and said cooling means includes a condensing coil in the tank spaced above the solvent level, and means forcing a cooling media through the coil.

Claim 4

The combination as defined in claim 2, wherein said cooling means further includes a cooling coil in the tank positioned within the coolant, and means forcing a cooling media through the cooling coil.

Claim 5

The combination as defined in claim 3, and means removably connecting the specimen in the pipe loop.

Claim 6

A constant temperature cold-end corrosion probe for determining the rate of sulphuric acid corrosion caused by flue gases in the cold end of a sulphur-containing fuel fired boiler, said probe comprising a corrosion specimen in the form of a metal pipe section adapted to be exposed to the flue gases of a temperature above the maximum corrosion temperature, a fitting in the breeching wall of the boiler, pipe sections connected to the specimen and extending from the fitting defining a pipe loop having an upper run and a lower run in which the specimen is located, said runs arranged in a vertical plane, a coolant tank outside the breeching wall having upper and lower coolant ports connected to the pipe loop, coolant in the tank at a level above said ports and having a bOiling temperature of about the temperature desired for probe operation, and coolant cooling means including a condensing coil in the coolant tank above the coolant level connected to a source of circulating water of a temperature lower than the coolant boiling point to condense the coolant in a gaseous phase and cool the coolant to a temperature below its boiling point.

Claim 7

A constant temperature cold-end corrosion probe for determining the rate of sulphuric acid corrosion caused by flue gases in the cold end of a sulphur-containing fuel fired boiler, said probe comprising a corrosion specimen in the form of a metal pipe section adapted to be exposed to the flue gases of a temperature above the maximum corrosion temperature, a fitting in the breeching wall of the boiler, pipe sections connected to the specimen and extending from the fitting defining a pipe loop having an upper run and a lower run in which the specimen is located, said runs arranged in a vertical plane, a coolant tank outside the breeching wall having upper and lower coolant ports connected to the pipe loop, coolant in the tank at a level above said ports and having a bOiling temperature of about the temperature desired for probe operation, and coolant cooling means including a condensing coil in the coolant tank above the coolant level connected to a source of circulating water of a temperature lower than the coolant boiling point to condense the coolant in a gaseous phase and cool the coolant to a temperature below its boiling point.

Claim 8

The combination as defined in claim 5, wherein the specimen is mounted in the upper run of the pipe loop.

Claim 9

The combination as defined in claim 6, wherein said coolant cooling means further includes a cooling coil positioned within the coolant and connected to said source of circulating water to temper the coolant.

Claim 10

Apparatus for determining the sulphuric acid deposition rate of a boiler flue gas stream produced by a sulphur-containing fuel fired boiler comprising a probe pipe loop having upper and lower runs extending horizontally and arranged in a vertical plane and having a removable specimen therein, a fitting in the breeching wall of the boiler, a pair of pipe sections extending through the fitting and at each side thereof the portions of which extend into the flue gas stream constitute part of said upper and lower runs, said specimen being a straight pipe section and defining a part of the upper run, a coupling connecting one end of the specimen to the upper run pipe section extending through said fitting, an interconnecting pipe section between the lower run pipe section extending through the fitting and the specimen including a straight portion extending from said lower run pipe section and defining a part of the lower run and a loop portion extending from said specimen, couplings connecting the loop portion of the interconnecting pipe section to the specimen and the straight portion thereof to the lower run pipe section, and means connected to the upper and lower run pipe sections outside the breeching wall for cooling the loop by forcing a cooling media through the loop.

Claim 11

Apparatus for determining the sulphuric acid deposition rate of a boiler flue gas stream produced by a sulphur-containing fuel fired boiler comprising a probe pipe loop having upper and lower runs extending horizontally and arranged in a vertical plane and having a removable specimen therein, a fitting in the breeching wall of the boiler, a pair of pipe sections extending through the fitting and at each side thereof the portions of which extend into the flue gas stream constitute part of said upper and lower runs, said specimen being a straight pipe section and defining a part of the upper run, a coupling connecting one end of the specimen to the upper run pipe section extending through said fitting, an interconnecting pipe section between the lower run pipe section extending through the fitting and the specimen including a straight portion extending from said lower run pipe section and defining a part of the lower run and a loop portion extending from said specimen, couplings connecting the loop portion of the interconnecting pipe section to the specimen and the straight portion thereof to the lower run pipe section, and means connected to the upper and lower run pipe sections outside the breeching wall for cooling the loop by forcing a cooling media through the loop.

Claim 14

The method as defined in claim 9, wherein the step of positioning the probe loop within the gas stream includes positioning where the gas stream temperature is at least 300* F.

Claim 15

The method as defined in claim 9, wherein the step of cooling the solvent in the tank includes positioning a condensing coil above the liquid phase to condense the gaseous phase.

Claim 18

The method as defined in claim 12, wherein the step of positioning the probe section in the flue gas stream includes subjecting the probe to a temperature of at least 300* F., and wherein the step of filling the tank with an organic solvent includes choosing a solvent having a boiling point of about 250* F.