Gas sampling apparatus for extraction of gaseous samples

Use of a gas sampling apparatus comprising:

• a housing comprising a housing wall enclosing an interior of the housing, wherein the housing wall comprises:
• an exterior housing surface;
• an interior housing surface;
• a rim surface connecting the exterior housing surface and the interior housing surface enclosing a housing opening directed towards a gaseous environment during use, wherein the housing opening is located at a front portion of the housing and is configured to provide initial fluid communication between the gaseous environment and the interior of the housing;
• a sample system for extracting a gaseous sample from the gaseous environment, wherein the sample system comprises:
• at least one sample pipe having an opening at the front portion of the housing, wherein at least the opening is enclosed by the housing wall and is configured to be in fluid communication with the gaseous environment;
• and
• filter means comprising at least one filter for filtering a plurality of solid particles from the gaseous sample, wherein the at least one filter is enclosed by the housing wall and arranged at the opening of the at least one sample pipe, wherein the gas sampling apparatus further comprises:
• a central purge system configured to remove aggregates of solid particles deposited on one or more of the rim surface, the interior housing surface and the exterior housing surface by a gaseous medium, wherein the central purge system comprises at least one purge pipe comprising an outlet opening directed towards the housing opening and enclosed by the housing wall;
• a peripheral purge system configured to clean at least a part of an exterior surface of the at least one filter, wherein the peripheral purge system comprises one or more second purge pipes enclosed by the housing and arranged externally to the sample system;
• wherein the sample system is arranged externally to the central purge system so that at least the one sample pipe is separate from the at least one purge pipe;
• and
• wherein the at least one filter and the housing opening are positioned in an open end of the housing and wherein the open end of the housing is arranged to be positioned inside the gaseous environment, during use, wherein the use comprises:
• extracting a gas sample from a gaseous environment, wherein a gaseous sample is extracted from the gaseous environment through the housing opening and the first opening and thereafter through the sample pipe;
• and
• cleaning at least a part of housing by releasing a gaseous medium towards one or more of the rim surface, the interior housing surface and the exterior housing surface through at least the purge pipe, and wherein the at least one filter is arranged radially between an exterior surface of the purge pipe and the housing further comprising a filter cleaning system for cleaning the at least one filter, wherein the filter cleaning system comprises one of more filter cleaning pipes configured to direct a gaseous medium through the at least one filter towards the gaseous environment;
• wherein the one or more second purge pipes are configured to be connected to a gas supply system and to transfer a gaseous medium from the gas supply system to at least a part of the exterior surface of the at least one filter;
• wherein the sample system is configured to be in connection with a gas analysis system so as to transfer the gaseous sample extracted from the gaseous environment to the gas analysis system.

A gas sampling apparatus for extraction of a gaseous sample from a gaseous environment comprising flue gas comprising solid particles, wherein the gas sampling apparatus comprises:

• a housing comprising a housing wall enclosing an interior of the housing, wherein the housing wall comprises:
• an exterior housing surface;
• an interior housing surface;
• a rim surface connecting the exterior housing surface and the interior housing surface and enclosing a housing opening directed towards a gaseous environment during use, the housing opening is located a front portion of the housing and is positioned in an open end of the housing, wherein the open end of the housing is arranged to be positioned inside the gaseous environment, during use, wherein the housing opening is configured to provide initial fluid communication between the gaseous environment and the interior of the housing;
• a sample system for extracting a gaseous sample from the gaseous environment, wherein the sample system comprises:
• at least one sample pipe having a opening at the front portion of the housing, wherein the opening is enclosed by the housing wall and is configured to be in fluid communication with the gaseous environment;
• and
• filter means comprising at least one filter for filtering a plurality of solid particles from the gaseous sample, wherein the at least one filter is enclosed by the housing wall and arranged at the opening of the at least one sample pipe and in the open end of the housing, wherein the gas sampling apparatus further comprises:
• a central purge system configured to remove aggregates of solid particles deposited on one or more of the rim surface, the interior housing surface and the exterior housing surface by means of a gaseous medium, wherein the central purge system comprises at least one purge pipe comprising an outlet opening directed towards the housing opening and enclosed by the housing wall;
• a peripheral purge system configured to clean at least a part of an exterior surface of the at least one filter, wherein the peripheral purge system comprises one or more second purge pipes enclosed by the housing and arranged externally to the sample system;
• and
• wherein the sample system is arranged externally to the central purge system so that at least the at least one sample pipe is separate from the at least one purge pipe and wherein the at least one filter is arranged radially between the housing and an exterior surface of the at least one purge pipe;
• further comprising a filter cleaning system for cleaning the at least one filter, wherein the filter cleaning system comprises one of more filter cleaning pipes configured to direct a gaseous medium through the at least one filter towards the gaseous environment;
• wherein the one or more second purge pipes are configured to be connected to a gas supply system and to transfer a gaseous medium from the gas supply system to at least a part of the exterior surface of the at least one filter;
• wherein the sample system is configured to be in connection with a gas analysis system so as to transfer the gaseous sample extracted from the gaseous environment to the gas analysis system.