4results about How to "Reduce particulate matter" patented technology

This invention discloses a method for ultrapurifying electronic-grade hydrochloric acid using gas membrane filtration and multi-stage distillation. The method includes: preheating industrial-grade hydrochloric acid feedstock and feeding it into a desorption column; desorption at a temperature above the azeotropic point of hydrogen chloride and water to obtain crude hydrogen chloride gas; cooling the obtained crude hydrogen chloride gas to above its dew point and then feeding it into a gas membrane separation unit for filtration using a hydrophobic porous or dense membrane to remove entrained droplets, particulate matter, and non-volatile metal impurities, obtaining purified hydrogen chloride gas; pressurizing and liquefying the obtained purified hydrogen chloride gas and then feeding it into a multi-stage distillation column system for continuous distillation. The multi-stage distillation column system includes at least two distillation columns connected in series, further removing trace impurities with boiling points similar to hydrogen chloride through gas-liquid mass transfer to obtain ultrapure hydrogen chloride liquid; vaporizing the obtained ultrapure hydrogen chloride liquid and isothermally absorbing it with ultrapure water in an absorption column to obtain electronic-grade hydrochloric acid product. This invention significantly reduces the impurity load of the distillation system.

The utility model relates to the technical field of oil tank machining, in particular to an oil tank machining device with a waste gas treatment function, which comprises a table type supporting mechanism, a waste gas treatment mechanism and a waste gas treatment mechanism. The water cooling mechanism is arranged on the table type supporting mechanism, and a water cooling assembly and a spraying assembly are arranged in the water cooling mechanism; the gas inlet mechanism is installed on the water cooling mechanism, the water cooling assembly is used for cooling the surface wall of the initial end of the gas inlet mechanism, and the spraying assembly is used for spraying cooling and dust falling of waste gas in the gas inlet mechanism; according to the waste gas treatment device, waste gas on the pipe wall and waste gas in the pipe wall are properly cooled, then the waste gas is sprayed through the spraying mechanism, on one hand, the waste gas is cooled again, and on the other hand, the waste gas in the pipe wall and the waste gas in the pipe wall are cooled; on the other hand, pollutants are absorbed, neutralized or captured through contact between the spraying liquid and the waste gas, and particles in the waste gas can be effectively reduced.

This invention discloses a method and system for controlling surface defects in strip steel, applied in a defect control system. The defect control system includes a coating liquid circulation subsystem. The inner wall of the circulation pipe in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipe to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipe, and the controller is connected to the cleaning device. The method includes: controlling the cleaning device to rinse the circulation pipe at every preset cleaning cycle; during the operation of the coating liquid circulation subsystem, controlling the stirring speed during the coating liquid preparation process to be greater than a first preset speed threshold, and controlling the stirring speed during the coating liquid use process to be greater than a second preset speed threshold. This method can effectively improve the surface indentation defects of strip steel, avoid the generation of batch indentation defects, and thus improve the production quality of strip steel.

This invention provides a method for reducing particulate matter in high-purity metal materials. The method includes: (1) placing multiple metal sheets in a partitioned heating device to form a stack; wherein the partitioned heating device includes a first temperature zone and a second temperature zone distributed sequentially from top to bottom; a portion of the stack is located in the first temperature zone, and another portion is located in the second temperature zone; (2) sequentially performing a first-stage partitioned heating and a second-stage partitioned heating on the stack to obtain high-purity metal materials; wherein, during the first-stage partitioned heating process, the target temperature of the first temperature zone is greater than the target temperature of the second temperature zone. This invention performs two-stage partitioned heating on the stack formed by multiple metal sheets. During the first-stage partitioned heating process, melting begins from the top of the stack, thereby reducing the probability of the metal sheets slipping during melting and reducing particulate matter in the high-purity metal materials.