4results about How to "Settlement fee" patented technology

The present invention discloses a low-energy consumption, low-carbon source addition high-ammonia nitrogen wastewater treatment process and system, the process includes the following steps: S1, pretreatment stage; high-concentration ammonia nitrogen wastewater is first subjected to denitrification and short-range denitrification reaction; S2, main reaction stage; wastewater undergoes short-range nitrification reaction, anaerobic ammonia oxidation reaction, short-range denitrification reaction and organic matter degradation; S3, stable effluent stage; the remaining ammonia nitrogen and nitrite nitrogen in the wastewater are oxidized into nitrate nitrogen, and polyphosphate bacteria are used to perform aerobic phosphorus absorption reaction. The process of the present invention adopts multi-stage process combination, precise control, high solid load solid-liquid separation and concentration technology, high-rate pneumatic lifting internal and external reflux circulation technology to not only integrate the advantages of traditional A2 / O, SBR, oxidation ditch and MBR, but also has the synchronous short-range nitrification and denitrification, short-range denitrification, and anaerobic ammonia oxidation functions that are difficult to achieve in these processes, and has the advantages of strong resistance to shock loads, low operating costs, and small footprint.

This utility model discloses a cast chute for an alkali recovery boiler, comprising a chute body, a flange plate at the front opening edge of the chute body, a fixing plate at the back surface of the chute body located on the flange plate, and side plates at the top of both sides of the chute body. The chute body, flange plate, fixing plate, and side plates are cast as a single unit. An inner jacket is snapped into the top of the chute body, and a slot and a fixing slot are snapped into the interior of the chute body. This utility model eliminates the water-cooled jacketed structure and adopts a dry-firing structure. The cast components are resistant to high temperatures of 1300℃ and can withstand the corrosion and wear of 1000℃ high-temperature molten lava in alkali recovery boilers. It has no complex circulating cooling water system, a long service life (generally more than 6 months), and no leakage or cracking occurs during its service life, eliminating safety hazards. The chute replacement time coincides with the normal boiler maintenance time, making it convenient to use and solving the problems of safety hazards and high operating costs associated with existing water-cooled jacketed chutes.

The sand core comprises a chromium ore auxiliary core, a sand filling opening, a chromium ore layer, a core bar and an inner-layer sand core, the sand filling opening is formed in the chromium ore auxiliary core, and the chromium ore layer and the inner-layer sand core are sequentially arranged in the chromium ore auxiliary core from top to bottom; the core bar is further arranged in the chromium ore auxiliary core, and the chromium ore auxiliary core, the chromium ore layer and the inner-layer sand core are stringed into a whole. The invention further discloses a core manufacturing method of the sand core for the steel casting. According to the technical scheme, the problems that a casting is prone to sand burning and sintering, the mold manufacturing period is long, and the cost is high are solved, mold-free rapid production and sand core integrated forming are achieved, the quality of the casting is guaranteed, meanwhile, the sand core weight is reduced, and the production cost is saved.

The invention relates to the technical field of valve control meter shell manufacturing, in particular to a stainless steel valve control meter shell and a manufacturing method thereof, and the method comprises the steps of manufacturing a metering cavity pipe section, a ball valve cavity pipe section, a water inlet pipe, a connecting pipe and a water outlet pipe and welding to obtain the stainless steel valve control meter shell. Compared with a valve control meter shell manufactured by using an integral casting process in the prior art, a forming mold is not used, the problems of high cost and short service life caused by the forming mold are solved, the problems of long production period and long machining time are also solved, the cost is reduced, and the finally formed valve control meter shell is small in mass and does not have the defects of sand holes, air holes and the like. Compared with a valve control meter shell manufactured by using an integral welding process in the prior art, the valve control meter shell has the advantages that the machining procedures of blanking, deep drawing, chambering, rotary cutting and the like are not needed, and the selected existing pipe fitting is hollow, so that parts such as a valve rod matching middle hole, a valve mounting hole and the like do not need to be machined, and the problems of complex process and more cutting wastes caused by a machining process are solved.