Safety devices prevent packaged catalytic converters from being expelled from stacks, or at least reduce the velocity with which such a package may be expelled, in case of an explosion in a bio-fueled appliance, such as a wood-burning stove.

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for reducing and/or eliminating various liquid discharges from one or more emission control equipment devices (e.g., one or more wet flue gas desulfurization (WFGD) units). In another embodiment, the method and apparatus of the present invention is designed to reduce and/or eliminate the amount of liquid waste that is discharged from a WFGD unit by subjecting the WFGD liquid waste to one or more drying processes, one or more spray dryer (or spray dry) absorber processes, and/or one or more spray dryer (or spray dry) evaporation processes.

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for: (a) achieving a reduction in the level of one or more halogens, or halogen-containing compounds, necessary to affect gas-phase mercury control; (b) permitting the oxidation of at least a portion of any elemental mercury (Hg.sup.0) contained in a flue gas and/or combustion gas stream; and/or (c) permitting the oxidation of at least a portion of any elemental mercury (Hg.sup.0) contained in a flue gas and/or combustion gas stream so that the use of at least one post-oxidation mercury capture method and/or process results in the capture of at least a portion of oxidized mercury contained in the flue gas and/or combustion gas stream.

A highly efficient indoor heating system and device is described. The device is equipped with an internal chimney, as well as vents that are configured to maximize the draft applied to the flame housed within a stove combustion area. The heater is configured to reach temperatures exceeding 300 degrees Fahrenheit in approximately ten minutes. A gravity fed fuel tube, potentially in communication with a wood pellet hopper, is configured to deliver fuel to the stove of the heater. Heat is distributed throughout the structure of the device, and a convection chamber within the device ensures that heat generated is not quickly lost via exhaust.

A non-bypassable catalyst assisted appliance includes, for example, a housing having a combustion chamber therein. The housing has a loading door opening coverable by a door for loading fuel into the combustion chamber, an air inlet opening for receiving an air supply to the combustion chamber, and an exit opening connectable to a flue. A catalyst combustor is disposed between the combustion chamber and the exit opening. When the door of the non-bypassable catalyst assisted appliance is disposed in a closed position covering the loading door opening, gas from the combustion chamber is directed through the catalyst combustor, and out the flue. When the door of the non-bypassable catalyst assisted appliance is disposed in an open position allowing loading of fuel through the loading door opening to the combustion chamber, ambient air entering the loading door opening and gas from the combustion chamber are directed through the catalyst combustor, and out the flue.

An integrated purification method and an integrated purification system for an industrial exhaust gas containing cyanides, hydrocarbons and NO.sub.x. The method comprises the steps of: 1) subjecting the exhaust gas containing pollutants such as cyanides, hydrocarbons and nitrogen oxides (NO.sub.x) to a gas-liquid separation device (1) to separate the free fluid, then mixing with the air blown by the air blower (201, 202), and preheating by the heating unit; 2) the mixture entering into the selective catalytic combustion (SCC) reactor (5) for the selective catalytic combustion reaction to convert harmful substances into CO.sub.2, H.sub.2O and N.sub.2, the catalysis being performed in two stages: the earlier stage is catalyzed by supported molecular sieve catalyst, and the latter stage is catalyzed by supported precious metal catalyst; and 3) the gas came out from the SCC reactor (5) entering into the heating unit to recover the heat, and then the purified exhaust gas being discharged directly through the chimney (6). The system comprises a gas-liquid separation device (1), a heating unit and a selective catalytic combustion reactor (5), a gas outlet of the gas-liquid separation device (1) being connected to the selective catalytic combustion reactor (5) through the heating unit, and an exhaust gas outlet of the selective catalytic combustion reactor (5) being connected to a chimney (6) through the heating unit.

Waste treatment comprises heating it in a chamber to effect pyrolysis of the waste, introducing oxygen into the chamber to effect combustion of the pyrolyzed waste, and contacting off-gas from the pyrolysis and/or combustion steps with an oxidation catalyst to convert carbon monoxide and hydrocarbons in the off-gas into carbon dioxide and water and with a reduction catalyst to convert nitrous oxides to nitrogen and oxygen. Thus, domestic waste is treated in a batch process using catalytic converters to reduce the level of toxic components before off-gas reaches the atmosphere.

Provided are: an NOx removal unit to remove nitrogen oxide; an air preheater on a downstream side of the NOx removal unit to recover heat; a precipitator on a downstream side of the air preheater to remove ash dust; a gas-liquid contact type desulfurization unit on a downstream side of the precipitator to remove sulfur oxide; an SO.sub.3 removing agent supply unit to supply an SO.sub.3 removing agent at a supply unit on an upstream side of the precipitator; and a wet state processing unit between the air preheater and the supply unit to supply water to a flue gas to be made into a wet state; the wet state processing unit having a stand-up portion, a partition unit and a droplet supply unit.

A thermal power plant has an exhaust gas system, a feed-water system, a high-pressure feed-water heater provided to the feed-water system, a main economizer, a catalytic NOx removal equipment, and a sub economizer. The main economizer is provided to the secondary side of the high-pressure feed-water heater of the feed-water system and increases the temperature of the feed-water by using the residual heat of the combustion gas from the boiler. The catalytic NOx removal equipment is provided to the secondary side of the main economizer of the exhaust gas system. The exhaust gas is supplied to the catalytic NOx removal equipment at a required temperature or higher. The sub economizer is provided between the high-pressure feed-water heater and the main economizer and increases the temperature of water by using the exhaust gas on the secondary side of the NOx removal equipment.

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.