A device (1) for generating clean air in a measuring apparatus, comprising: a duct (2) having an inlet and an outlet for the passage of an air flow to be cleaned; a platinum wire (3), positioned inside the duct (2), for intercepting the air flow to be cleaned, the platinum wire (3) is inserted in an electrical circuit (17) connectable to an electricity supply (15) to be operatively crossed by an electrical current.

A method and apparatus for cleaning and recycling stack gas from coal-fired power plants, from natural or propane burning heating plants, or from cement kilns by using renewable catalysts of zeolite to separate pollutants into recyclable and reusable materials. The method reduces from the stack gas carbon monoxide (CO), carbon dioxide (CO.sub.2), nitrogen oxide (NOx), sulfur oxide (SOx) as well as halogens such as chloride and fluorides and trace metals particularly, mercury, lead, and zinc.

Reclaiming useful products for commercial use and/or to be reused in an exhaust gas clean-up system. This is accomplished by subjecting the power plant exhaust gas to the various cleaning fluids followed by reclaiming the useful products from the exiting cleaning liquid. As the exhaust gas passes through a medium of water and calcium carbonate in a wet scrubber, the exiting cleaning fluid contains various calcium salts. Likewise, as the exhaust gas passes through a medium of calcium hydroxide and water other calcium salts are produced. By passing these respective calcium salts through solid-liquid centrifuge separators and other separating stirred tanks, various useful products are reclaimed and reused in the process or commercially sold. Some useful products are carbon dioxide, calcium sulfate, calcium carbonate, and mercuric salts.

An apparatus for treating a substrate, including a chamber; a substrate treater in the chamber; a purifier connected to the chamber, the purifier to purify polluted air in the chamber; a light source in the chamber, the light source to irradiate light; and a light-shield to block the light irradiated by the light source from arriving at the substrate treater.

A fossil fuel fired power plant exhaust gas clean-up and recovery system is provided to remove detrimental compounds/elements from the exhaust gas emitting from the power plant to protect the environment and to recover useful products from the cleaning solution. This is accomplished by directing the exhaust gas from the fossil fuel fired power plant through a single wet scrubber having a cleaning solution of a predetermined pH. The cleaning solution is composed of calcium carbonate and water. Aa recovery process is attached thereto to reclaim calcium carbonate, calcium sulfate, and carbon dioxide for reuse in the process and/or for commercial use.

The combustion and flue gas treatment system includes a furnace for combusting a fuel with an oxidizer generating a flue gas, ducting for the flue gas connected to a NO.sub.x removal unit and a SO.sub.x removal unit, and a recirculation line for recirculating a part of the flue gas back to the furnace. The SO.sub.x removal unit is located upstream of the NO.sub.x removal unit with reference to the flue gas flow. The recirculation line is connected to the ducting downstream the SO.sub.x removal unit.

A fossil fuel fired power plant exhaust gas clean-up system is provided to remove detrimental compounds/elements from the exhaust gas emitting from the power plant to protect the environment. This is accomplished primarily by directing the exhaust gas from a fossil fuel fired power plant through both a reaction chamber containing a chemically produced compound and a catalytic converter. The final exhaust gas can now be safely exhausted to the atmosphere and only contains nitrogen gas, oxygen, water and a trace amount of carbon dioxide.

A method for recovering carbon dioxide from gas, which method includes the steps of: pressurizing gas, feeding pressurized gas and water used as a solvent to an absorption column to 3 to 10 bar absolute pressure, feeding water received from the absorption column and carbon dioxide absorbed therein to a desorption column for recovering carbon dioxide from the water, recirculating water exiting the desorption column to the absorption column, recovering carbon dioxide exiting the desorption column, feeding at least part of the gas to an auxiliary desorption column prior to pressurizing the gas, and sending water exiting the desorption column back to the auxiliary desorption column.
The method also applies to a corresponding system.

Disclosed in the present invention are a device system and method having sintering flue gas CO catalytic heat exchange and medium-and-low-temperature SCR denitration connected in series. In the device system, a CO catalytic heat storage and exchange device is arranged to completely replace an original heat exchanger arranged after a raw desulfurized flue gas pipe. The method comprises respectively carrying out first CO catalytic conversion and second CO catalytic conversion on sintering flue gas and denitrated flue gas by means of the CO catalytic heat storage and exchange device, thereby increasing CO conversion efficiency and reducing overall resistance of the system. In addition, the present invention takes both CO pollution control and carbon emission reduction into consideration and thus has good economic benefits and a good application prospect.

A method comprising contacting an offgas stream comprising H2, H2O, CO, CO2, and at least one impurity comprising COS with at least one metal oxide to catalyze a reaction of H2O and COS to form H2S and CO2 in the offgas stream; contacting the offgas stream with an H2S-adsorbent to remove H2S from the offgas stream to produce a treated gas stream; and separating the treated gas stream to produce a carbon dioxide-enriched stream and a carbon dioxide-depleted stream.