191 results about "Thermal oxidizer" patented technology

A thermal oxidizer is provided in which off-gases in a process stream are thermally oxidized within substantially the entire interior volume of an oxidation chamber. The thermal oxidation is conducted without the presence of a flame or with only a minor portion of the fuel being combusted in a flame.

A process for thermally cracking virgin or waste animal oils (tallow) into a diesel fuel product is provided. The thermal cracking process uses low cracking temperatures from 625 to 725° F. with ambient pressure and no catalyst to generate a column distilled fraction of diesel fuel mixed with light ends, the light ends being flashed off to produce a high quality #2 diesel fuel suitable for road use. The oils to be distilled are exposed to a heat exchanger with a skin temperature of 1750° F. generated by hot air produced by a thermal oxidizer. This results in the processed product going from a liquid to a liguid/gas during the pump around residence time of 3 to 5 seconds before moving up a distillation column as a gas to the desired finished product.

The invention discloses a waste gas treatment method of a coating workshop based on a concentrated runner and an RTO (regenerative thermal oxidizer), wherein the concentrated runner comprises at least one adsorption zone and a high-temperature desorption zone. The waste gas treatment method comprises the steps of feeding waste gas discharged from the coating workshop into the adsorption zone of the concentrated runner after filtering, adsorbing a VOC (volatile organic compound) ingredient in the waste gas by an adsorbent of a sector corresponding to the adsorption zone; controlling the concentrated runner to continuously rotate; when the sector with the adsorbed VOC ingredient rotates to the high-temperature desorption zone, desorbing the VOC ingredient by hot air inside the high-temperature desorption zone, and feeding to the RTO to burn and discharge along with the hot air. With the adoption of the waste gas treatment method and system, the processed air volume of organic waste gas entering the RTO can be effectively reduced; and the concentration of the organic solvent in the RTO organic waste gas is increased. Thus, the RTO treatment efficiency is improved and the operation cost is reduced. The invention further discloses a waste gas treatment system of the coating workshop based on the concentrated runner and the RTO.

A method and apparatus are provided for reducing the VOC, CO, and, alternatively, the NOx content of dryer offgas that is discharged into the atmosphere from a moist organic product drying process using thermal oxidizing apparatus that includes a burner, furnace, mixing chamber, thermal oxidizer, tempering chamber, and an indirect gas-to-gas heat exchanger. The dryer offgas is separated into two portions, with a larger portion being preheated by indirect heat exchange with the hot gaseous output from the thermal oxidizer. The non-preheated portion is directed to the burner in the function of flue gas recycle for NOx control. The preheated portion is separated into two portions, with one portion being directed to the furnace/mixing chamber of the thermal oxidizing apparatus. The other portion of the preheated offgas is recycled to the hot gas inlet of the dryer and serves the function of dryer heat transfer media. Ultimately, all the dryer offgas enters the thermal oxidizer, and comprises a smaller non-preheated portion directed to the burner and a larger preheated portion directed to the furnace/mixing chamber. By preheating a large proportion of the offgas directed to the thermal oxidizing apparatus, simultaneous achievement of an adequate thermal oxidizer temperature, 1600° F., and an adequate oxygen concentration of 5% by volume is achieved for optimized thermal oxidation of carbon monoxide and volatile organic compounds.

A Rotary thermal processor for particulate materials has a rotating drum and a rotating hollow auger. A stationary cylindrical oven with stationary coils surrounds the rotating drum. Hot gas heats a first part of the oven, coil and drum. A rotating hollow auger is heated with hot fluid from the coils. Oven exhaust sweeps evaporated and volatized components of the treated materials to separators and a thermal oxidizer. Cleaned gas from the thermal oxidizer heats a second part of the oven coil and drum and exits a stack. The rotating drum and auger lifts and turns the treated material as it is advanced by the auger.

The method of the present invention reduces the emissions of waste oxide gas produced within a thermal oxidizer by the use of a multizone waste thermal oxidizer, comprising at least one primary combustion zone and at least one downstream waste destruction zone. By performing the primary combustion of fuel prior to the destruction of at least a portion of the waste, it has been discovered that NOx emissions from the waste destruction process can be reduced economically and without significant loss of overall waste destruction efficiency.

The invention relates to a color-coating line waste gas treatment and heat recovery method and system based on concentration rotating wheels and RTO (regenerative thermal oxidizer). The method comprises the following steps: low-temperature low concentration volatile organic compound waste gas discharged from a base coating machine room and top coating machine room is sent into an adsorption zone of the concentration rotating wheels through a low-temperature waste gas collection pipeline, so that the volatile organic compound waste gas is adsorbed by the adsorbent in the adsorption zone; high-temperature high-concentration volatile organic compound waste gas discharged by a base coating curing oven and a top coating curing oven is sent into a heat storage incinerator through a high-temperature waste gas collection pipeline; hot air mixed gas desorbed from the high-temperature waste gas collection pipeline and the high-temperature desorption zone of the concentration rotating wheels is sent into a heat storage incinerator oxidizing chamber to be combusted; and the discharged high-temperature clean gas is sent into a heat recovery system. Due to the adoption of the heat recovery system, the reheating of the concentration rotating wheels only needs to consume the heat quantity of the heat recovery system without additional heating, thereby saving abundant energy and making contribution to energy saving and emission reduction for the country. The invention also relates to a color-coating line waste gas treatment and heat recovery system based on concentration rotating wheels and RTO.

A high-temp. alkali-resistant material mainly contains MgO, SiO2 and Al2O3. Its primary crystal phase is forsterite and spinel. Its features are high resistance to alkali corrosion at high temp and use for preparing ceramic filler of heat-accumulating thermal oxidizer to treat organic waste gas in wood industry.

A manufacturing apparatus for producing products results in solid waste and organic waste disposed in an air stream. The organic waste is subject to oxidation by a thermal oxidizer receiving the air stream from the manufacturing apparatus for oxidizing the organic waste. The thermal oxidizer includes a clean air outlet for venting the oxidized air stream to the atmosphere. A gasifier receives solid waste from the manufacturing apparatus for gasifying the solid waste and producing synthetic gas. The synthetic gas is introduced to the thermal oxidizer for providing additional thermal energy to the thermal oxidizer reducing the amount of fossil fuel required to provide thermal energy to the thermal oxidizer that is necessary for oxidizing the organic waste disposed in said air stream.

A method and apparatus are provided for reducing the VOC and CO content of dryer offgas that is discharged into the atmosphere from a moist organic product drying process using thermal oxidizing apparatus that includes a furnace, mixing chamber, thermal oxidizer, tempering chamber, and an indirect gas-to-gas heat exchanger. The dryer offgas is separated into two portions, with a larger portion being preheated by indirect heat exchange with the hot gaseous output from the thermal oxidizer. The non-preheated portion is directed to a rotary waste heat evaporator in which moisture is removed therefrom. The preheated portion is recycled to the hot gas inlet of the dryer and serves the function of dryer heat transfer media. By removing moisture from the non-preheated portion of the offgas that is directed to the thermal oxidizing apparatus, simultaneous achievement of thermal oxidizer temperatures of 1600° F. or greater, and an adequate oxygen concentration of 5% by volume is achieved for optimized thermal oxidation of carbon monoxide and volatile organic compounds.

The present invention relates to the technical field of polyurethane resin preparation, and provides a preparation method of a high-weathering-resistance and high-wear-resistance polyurethane surface layer resin for vehicle interior decoration leathers. The preparation method comprises the following treatment steps: adding a solvent, polycarbonate diol, organosilicon polyol, a heat resistance oxidizer and a chain extender into a reaction kettle, heating to a temperature of 48-52 DEG C, stirring, adding non-yellowing isocyanate after the polycarbonate diol is dissolved, uniformly stirring, slowly heating to a temperature of 90-130 DEG C, carrying out a reaction for 110-120 min, adding a catalyst, carrying out a reaction for 120-125 min to prepare a prepolymer, detecting the NCO value of the reaction system, adding a solvent to dissolve the prepolymer when the NCO value is less than the theoretical value, cooling to a temperature of less than or equal to 50 DEG C, carrying out chain extending tackifying on the diluted amine chain extender by using the dropwise adding way, adding isopropanol to carry out end capping when achieving the process viscosity, heating, carrying out stirring mixing, cooling to a temperature of less than or equal to 50 DEG C, and discharging the material.

An apparatus for treating gaseous pollutants in an air stream such as a regenerative thermal oxidizer or a selective catalytic reduction system, including a reaction chamber wherein the reaction media bed within the chamber comprises a plurality of nonprismatic ceramic blocks each having end faces, side faces and a chamfered face extending at an angle relative to the side faces of the blocks. The ceramic blocks are stacked in end-to-end and side-to-side relation within the reaction chamber and the ceramic blocks each include spaced parallel passages extending through the end and chamfered faces. The chamfered faces of adjacent blocks form voids between the blocks promoting turbulent gas flow through the voids and equalizing the pressure within the reaction chamber. The ceramic blocks may be symmetrical, wherein only a portion of the gas flows into the voids between the blocks and the remainder flows through the channels through the end faces or the ceramic blocks may be nonsymmetrical, wherein the chamfered faces are located vertically opposite an end face, such that all of the gas flowing through the reaction chamber flows through the gas passages into the voids between the blocks at alternative levels.

A regenerative thermal oxidizer system (20) for use in processing a contaminated fluid. The system includes a combustion chamber (22), a contaminated fluid feed duct (39), and at least a first (24) and a second (26) regenerator chambers in fluid communication with the combustion chamber (22). A regenerator half-chamber (21) is provided in fluid and thermal communication with the combustion chamber (22). A first flow control element (44) is provided for controlling a flow of fluid from the system fluid feed duct (39) to the first regenerator chamber (24), and a second flow control element (46) is provided for controlling a flow of fluid from the system fluid feed duct (39) to the second regenerator chamber (26). An intermittent supply duct (60) connects the system fluid feed duct (39) to the regenerator half-chamber (21). A third flow control element (62) controls flow of system feed fluid through the intermittent supply duct (60). Feed fluid is directed either to one of the first (24) and second (26) regenerator chambers or to the half-chamber (21) prior to flowing into the combustion chamber (22) so that the fluid is are pre-heated prior to entering the combustion chamber (21).

A method and device for improved efficiency in thermal oxidation is presented which uses a cyclonic flame to combust a stream of hydrocarbons drawn to the flame source by a pressure differential. The improved burner and method are particularly suited for combusting volatile organic compounds that are a derivative result of another waste management process mechanically attached to a thermal oxidizer. The improved burner is formed by configuring a burner basket into a conical shape with openings that allow a combustible gas to travel along the interior of the basket frame. The gas travels spirally within the basket frame as it is assisted by forced air and when ignited, creates a cyclonic flame effectively combusting material such as volatile organic compounds that are manipulated into contacting the flame.

Provided is a regenerative thermal oxidization system which solves the problem that a regenerative thermal oxidizer (RTO) is completely connected to production equipment by a duct when a damper open to the atmosphere is closed and, accordingly, a static pressure fluctuation generated when an inlet or outlet damper of the RTO is switched is transmitted to the production equipment via the duct, as well as the problem that there is a possibility that a duct open to the atmosphere, which is installed instead of the damper open to the atmosphere, functions as an atmospheric buffer and, accordingly, the amount of exhaust gas from the production equipment varies depending on the amount of production, and the leakage of the exhaust gas from the duct open to the atmosphere and the suction of atmospheric air occur. The regenerative thermal oxidization system is provided with a differential pressure transmitter whereby a duct open to the atmosphere, which is installed in an intake duct that connects the blower of the regenerative thermal oxidizer (RTO) and the exhaust blower of production equipment that generates exhaust gas, is connected to the control damper or the air blower operation inverter of the RTO, said damper or inverter being disposed between the differential pressure transmitter and the blower of the RTO.

The invention relates to a waste gas treatment system based on runner concentration and regenerative combustion. The waste gas treatment system comprises a filter, a runner concentration device and an RTO (regenerative thermal oxidizer), wherein the runner concentration device comprises a concentration runner and a drive motor, the concentration runner comprises an adsorption zone, a cooling zone and a desorption zone, and an adsorbent is arranged on the sector of the concentration runner; an outlet of the filter is connected with an inlet of the adsorption zone of the concentration runner through a fan; the RTO comprises a combustion chamber, a regeneration chamber, a regenerative body and a reversing valve. The waste gas treatment system has the advantages that the runner concentration device is added, the treatment air volume of organic waste gas entering the RTO can be effectively reduced, the concentration of organic solvent in organic waste gas entering the RTO can be increased, thus, the treatment efficiency of the RTO can be improved and the operation cost can be reduced.

The present invention provides a system and method for injecting natural gas in an RTO. The RTO may be, for example, a known type that has a rotary distributor, a center section divided into pie-shaped segments above the rotary distributor, a heat exchanger section above the center section, and a combustion chamber above the heat exchanger. According to an aspect of the invention, the system introduces gas into segments of the center section in a sequenced manner via cycling on/off control valves. In a particular embodiment, the natural gas is injected at a specific location of a respective segment within the center section that is past the rotary distributor seals and directly under the bottom of the heat exchanger bed. According to the injection sequence, the injection of natural gas into the segment commences when the segment begins to receive inlet waste gas streams, and injection ceases before the flow through the sector changes or stops. In an embodiment, each injection cycle may last a predetermined time to preferably achieve a constant flow of natural gas in the intake stream of process air as the rotary distributor delivers such flow sequentially among the segments.