Please select the most similar patent number from A, B, C and D. Which number is?
A high-efficiency dephosphorization method and apparatus. The high-efficiency dephosphorization apparatus comprises a pressure-bearing cavity for circulating a dephosphorization medium. The pressure-bearing cavity is provided with a dephosphorization medium inlet. The side wall of the pressure-bearing cavity close to the surface of a metal blank to be dephosphorized is provided with a jet outlet passage of the dephosphorization medium. The jet outlet passage is a long, narrow slot, so that the stream jetted to the surface of the metal blank is in a non-diffused sheet shape. The pressure-bearing cavity is a pipeline with a circular axial cross section. The pipeline is integrally formed or formed by joining two semicircular grooves. The pressure-bearing cavity is in a bar shape, an annular shape or a special shape. In the present invention, the dephosphorization medium is in a non-diffused sheet form after being jetted, the pressure is basically not diffused, so that the utilization efficiency of the pressure is improved, the jet speed of the dephosphorization stream is reduced, and the service life of the dephosphorization apparatus is extended; in addition, the high-efficiency dephosphorization apparatus has no installation condition limitation, and especially when a protection apparatus is arranged, the jet distance of the dephosphorization stream can be reduced, and the flow efficiency can be improved.
A: A multi-section water-soluble pipeline occluder, comprising a blocking part (1), the cross-section of the blocking part (1) being circular, and also comprising a pressure-bearing part (2) disposed on one side, a sealant (3) being arranged at the adjoining part of the blocking part (1) and the pressure-bearing part (2), the side surface of the pressure-bearing part (2) being provided with an accommodating part (4) for accommodating the sealant (3), and the blocking part (1), the sealant (3), and the pressure-bearing part (2) all being made of water-soluble material. The present multi-section water-soluble pipeline occluder can increase efficiency and safety.
B: A wireless charging transmitter compression-resistant device capable of convection heat dissipation for an electric vehicle, comprising a closed mounting chamber made of a heat conduction material, and a pressure bearing chamber located on the mounting chamber and covering the mounting chamber. The mounting chamber is internally provided with an inner core layer (4); the bottom of the pressure bearing chamber is formed of the top of the mounting chamber; the side wall of the pressure bearing chamber is provided with heat dissipation channels making the pressure bearing chamber in communication with the outside; the top surface of the mounting chamber is provided with a protrusion (32) for supporting the inner top surface of the pressure bearing chamber; the bottom surface of the mounting chamber and the bottom surface of the side wall of the pressure bearing chamber are flush with each other, and are both supported on the ground. The device has high structural strength and good heat dissipation performance.
C: Disclosed are an A/O-MBBR process-based integrated sewage treatment device and a sewage treatment method. The sewage treatment device comprises a clarification tank, an anoxic tank, a first-stage aerobic tank, a second-stage aerobic tank and a sedimentation tank which are sequentially connected via an overflow structure. A power structure is provided at the bottom of the sedimentation tank. The power structure is connected to the clarification tank via a return pipe. The return pipe is provided with a phosphorus removal agent access port and a pipe mixer. The pipe mixer is located downstream of the phosphorus removal agent access port. The anoxic filler in the anoxic tank is a combined filler, and is formed by combination of a polyurethane filler and a plastic spherical shell wrapping same. A carbon source agent access port is provided in a water inlet baffle of the anoxic tank. The aerobic fillers in the two aerobic tanks are respectively a high-density polyethylene MBBR filler and a PPC biological carrier. The components are installed in a housing, and the housing is made of a glass steel material. The sewage treatment device and the sewage treatment method use an A/O-MBBR pure biofilm process, have a strong impact resistance, and are supplemented with a chemical dephosphorization and carbon source feeding device, which can effectively enhance the removal of nitrogen and phosphorus contaminants.
D: A mixed jet descaling device axially and eccentrically arranged for the inner wall of a metal pipe comprises a support rod (1) arranged inside the metal pipe (100), the support rod being parallel to the central axis of the metal pipe, eccentrically arranged and not concentric with the central axis of the metal pipe; and at least two spray nozzle units (2, 2&#39;, 2&#34;) for spraying the mixed jet, the spray nozzle units being arranged from front to back along the length direction of the support rod. At least two mixed jet spray nozzles (21, 21&#39;, 21&#34;) are provided in each spray nozzle unit and uniformly arranged along the circumference of the support rod in such a manner that the mixed jet spray nozzles diverge towards periphery of the support rod with the axis of the support rod as the center. The mixed jet spray nozzles of the spray nozzle units arranged from front to back are staggered from front to back in the circumferential direction of the inner wall of the to-be-descaled metal pipe, thereby forming a mixed jet spray nozzle matrix and creating an effective descaling zone capable of completely covering the circumferential surface of the inner wall of the metal pipe. The descaling device can achieve continuous, high efficient, stable and environment-friendly descaling for the inner wall surfaces of cold-state metal pipes.
Answer: D