Atmospheric pollutants are efficiently separated from exhaust gas with low operating cost. The exhaust gas cleaning method forms a fine mist of aqueous alkaline solution with an atomizer in an atomizing step; mixes the aqueous alkaline solution mist with exhaust gas to absorb atmospheric pollutants contained in the exhaust gas into the mist in a mixing step; and separates mist that absorbed atmospheric pollutants from the exhaust gas in a separating step.

A method and installation for removing a gas from a flow of a gas mixture. A first liquid (82) is introduced in the flow (106) for evaporative cooling and saturation of the gas mixture. Small droplets of a second liquid (84) are provided which are capable of adsorbing and dissolving said gas and of a size small enough not to be sedimented by gravitation and big enough to be centrifugally separated. The small droplets are sprayed into the flow for adsorbing and dissolving said gas into the droplets, and the small droplets are centrifugally separated from the flow.

A method for collecting dust from a single crystal growth system includes providing dry air and oxygen into an exit pipe connecting to the single crystal growth system, blowing a first inert gas into the exit pipe to compel the dust oxide toward a dust collecting device, collecting the dust oxide by the dust collecting device; and providing a rotary pump to transport residues of the dust oxide backward. The oxygen reacts with the unstable dust for forming dust oxide. The exit pipe is used to exhaust unstable dust from the single crystal growth system.

A method for collecting dust from a single crystal growth system includes providing dry air and oxygen into an exit pipe connecting to the single crystal growth system, blowing a first inert gas into the exit pipe to compel the dust oxide toward a dust collecting device, collecting the dust oxide by the dust collecting device; and providing a rotary pump to transport residues of the dust oxide backward. The oxygen reacts with the unstable dust for forming dust oxide. The exit pipe is used to exhaust unstable dust from the single crystal growth system.

Systems and methods for separating components from a fluid stream are described. The systems and methods described herein may be specifically well suited for separating solids, hydrocarbons, chemicals, non-evaporable components, etc., from wastewater produced by oil and gas recovery. The systems and methods may generally include the use of a heat exchanger through which a fluid stream is passed to thereby evaporate some or all of the fluid stream. The heated stream exiting the heat exchanger may include vapor, liquids and/or solids. This heated stream is then subjected to phase separation to separate a vapor stream from a liquid/solids stream. The vapor stream is then transported back to the heat exchanger where it is used to transfer heat from the vapor stream to the fluid stream. During the operation of the heat exchanger, a scraping system may be used to scrape the one or more surfaces of the passage through which the fluid stream flows in order to prevent buildup of solids and liquids thereon.

Systems and methods for separating components from a fluid stream are described. The systems and methods described herein may be specifically well suited for separating solids, hydrocarbons, chemicals, non-evaporable components, etc., from wastewater produced by oil and gas recovery. The systems and methods may generally include the use of a heat exchanger through which a fluid stream is passed to thereby evaporate some or all of the fluid stream. The heated stream exiting the heat exchanger may include vapor, liquids and/or solids. This heated stream is then subjected to phase separation to separate a vapor stream from a liquid/solids stream. The vapor stream is then transported back to the heat exchanger where it is used to transfer heat from the vapor stream to the fluid stream. During the operation of the heat exchanger, a scraping system may be used to scrape the one or more surfaces of the passage through which the fluid stream flows in order to prevent buildup of solids and liquids thereon.

One aspect of the invention relates to a method comprising a single-stage conversion of an atmospheric pollutant, such as NO, NO.sub.2 and/or SOX in a first stream to one or more mineral acids and/or salts thereof by reacting with nonionic gas phase chlorine dioxide (ClO.sub.2.sup.0), wherein the reaction is carried out in the gas phase. Another aspect of the invention relates to a method comprising first adjusting the atmospheric pollutant concentrations in a first stream to a molar ratio of about 1:1, and then reacting with an aqueous metal hydroxide solution (MOH). Another aspect of the invention relates to an apparatus that can be used to carry out the methods disclosed herein. The methods disclosed herein are unexpectedly efficient and cost effective, and can be applied to a stream comprising high concentration and large volume of atmospheric pollutants.

One aspect of the invention relates to a method comprising a single-stage conversion of an atmospheric pollutant, such as NO, NO.sub.2 and/or SOX in a first stream to one or more mineral acids and/or salts thereof by reacting with nonionic gas phase chlorine dioxide (ClO.sub.2.sup.0), wherein the reaction is carried out in the gas phase. Another aspect of the invention relates to a method comprising first adjusting the atmospheric pollutant concentrations in a first stream to a molar ratio of about 1:1, and then reacting with an aqueous metal hydroxide solution (MOH). Another aspect of the invention relates to an apparatus that can be used to carry out the methods disclosed herein. The methods disclosed herein are unexpectedly efficient and cost effective, and can be applied to a stream comprising high concentration and large volume of atmospheric pollutants.

A system for removing dust from exhaust gas, comprising a dust removing system inlet, a dust removing system outlet, and an electric field apparatus (1021). The electric field apparatus (1021) comprises an electric field apparatus inlet, an electric field apparatus outlet, a dust-removing electric field cathode (10212) and a dust-removing electric field anode (10211). The dust-removing electric field cathode (10212) and the dust-removing electric field anode (10211) are used to generate an ionizing electric field for dust removal. When a certain amount of dust has accumulated on the electric field apparatus, the electric field apparatus performs a black carbon removal process, thereby avoiding a reduced electrode gap resulting from an increased thickness of black carbon.

The disclosure provides seven integrated methods for the chemical sequestration of carbon dioxide (CO.sub.2), nitric oxide (NO), nitrogen dioxide (NO.sub.2) (collectively NOR, where x=1, 2) and sulfur dioxide (SO.sub.2) using closed loop technology. The methods recycle process reagents and mass balance consumable reagents that can be made using electrochemical separation of sodium chloride (NaCl) or potassium chloride (KCl). The technology applies to marine and terrestrial exhaust gas sources for CO.sub.2, NOx and SO.sub.2. The integrated technology combines compatible and green processes that capture and/or convert CO.sub.2, NOx and SO.sub.2 into compounds that enhance the environment, many with commercial value.