6results about "Spent liquor concentration" patented technology

The application discloses an acid pickling corrosion inhibitor prepared based on bamboo pulp papermaking black liquor, and a preparation method and application thereof, and relates to the technical field of acid pickling corrosion inhibitors. The method comprises the following steps: (1) adding concentrated sulfuric acid into the bamboo pulp papermaking black liquor, adjusting the pH value of the solution to 1-3, and then fully reacting, standing and settling, and separating to obtain a precipitate A and a filtrate A; the precipitate A is washed and dried to obtain lignin; (2) the filtrate A is concentrated through multi-effect vacuum reduced pressure evaporation to obtain a precipitate B; (3) the precipitate B is extracted through sewage ethanol extraction, suction filtration and washing to obtain an ethanol extraction liquid and a precipitate C; the ethanol extraction liquid is distilled through reduced pressure distillation to obtain an ethanol extraction liquid; the precipitate C is recrystallized, and after removing solid inorganic salts, the precipitate C is distilled through reduced pressure distillation to obtain a distillation liquid; the ethanol extraction liquid and the distillation liquid are mixed, and then evaporated through reduced pressure evaporation and dried to obtain the acid pickling corrosion inhibitor.

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

The embodiment of the invention provides a paper-making industry black liquor concentration system based on an open type evaporation absorption principle, and relates to the technical field of paper-making industry black liquor concentration. The black liquor concentration system comprises black liquor concentration circulation, sewage circulation, circulating air circulation, regeneration tower condensate water circulation, a steam supply process and an incineration and flue gas treatment process, light sewage, medium sewage and alkali furnace flue gas heat originally containing waste heat are fully utilized through the synergistic effect of all the circulation, and pre-concentration treatment and pre-heating treatment of black liquor are constructed through cooperation of multiple heat sources. And multi-effect steam is saved. And the black liquor concentration system reasonably distributes light sewage, medium sewage and heavy sewage, so that good pre-treatment is performed for wastewater discharge of an alkali recovery workshop.

A method for optimizing reduction and content of total titratable alkali (TTA) of green liquor of a recovery boiler (100). The method comprises producing green liquor in a dissolving tank (200) by conveying smelt and weak white liquor into the dissolving tank and measuring at least the contents of sodium sulphate, sodium hydroxide, sodium sulphide, and sodium carbonate of the green liquor. The method comprises controlling at least a process parameter of a recovery boiler to maximize the reduction of the recovery boiler (100) and controlling the flow (Qin) of the weak white liquor into the dissolving tank (200) to optimize the content of total titratable alkali of the green liquor. In addition, a system (050) for producing green liquor with optimized reduction and content of total titratable alkali. The system comprises a first sensor arrangement, a first and a second regulator, and a processing unit arrangement (CPU1, CPU2, CPU3) configured to perform the method.

A startup burner assembly for a recovery boiler, the startup burner assembly includes a housing having a burner end and a second end distal to the burner end; a main fuel conduit disposed within the housing; and at least one high-pressure air conduit disposed within the burner end of the housing. The high-pressure air conduit includes at least one angled air injection nozzle configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction.