50results about How to "Solve the problem of thermal expansion" patented technology

The invention discloses a high-temperature vertical waste heat boiler with coil pipes. The high-temperature vertical waste heat boiler comprises a shell, a channel, a water circulating cooling structure and the coil pipes, wherein the coil pipes are arranged in a heat exchange chamber of the shell; a circulating water distributing chamber is arranged in the water circulating cooling structure; after entering the circulating water distributing chamber, cooling water is pressed in a cooling cavity between a flexible pipe plate and a thick pipe plate through annular gaps between outer pipe walls of process gas inlet ends of the coil pipes and walls of coil pipe penetrating holes, and is pressed in the shell by a water drainage pipe after the cooling water and the process gas inlet ends of the coil pipes exchange heat. The coil pipes are cooled uniformly, cooling of the coil pipes is not limited by the quantity of the coil pipes, cooling water sources and passages of heat exchange pipes are independent, uniform and one-to-one, if a pipe is added, another annular gap is formed, and accordingly the high-temperature vertical waste heat boiler in the cooling scheme can be provided with multiple pipes and can be large-sized.

The invention discloses a heat insulation layer structure which comprises a fixing plate (5) and a covering plate (2), wherein the covering plate (2) is fixed and connected with the fixing plate (5) through a primary fixing piece (1) and a secondary fixing piece (3); heat insulation material (4) is paved between the covering plate (2) and the fixing plate (5); a sealing film (7) is arranged on the heat insulation material (4); the primary fixing piece (1) is positioned in the middle of the covering plate (2); and the secondary fixing piece (3) is positioned on the periphery of the covering plate (2). The invention breaks through the limitation of the application field of the common heat insulation structure, can be applied to large-scale heat insulation of gas media of high temperature, high speed and high pressure, and solves the problem of the heat expansion generated on both sides of the heat insulation layer due to different temperatures.

The invention relates to the technical field of pipe hanging of a boiler superheater, and in particular to a hanging clamping frame structure for a boiler superheater. The hanging clamping frame structure can solve the problems of heat transfer due to connection and heat expansion and guarantee normal operation. The hanging clamping frame structure comprises a protection plate and a superheater pipe clamp, and is characterized in that the superheater pipe clamp is connected to one end of a supporting rib plate; the other end of the supporting rib plate is a T-shaped head; a bottom plate is mounted on the protection plate; a side surface of the T-shaped head end of the supporting rib plate clings to a vertical reinforcement of the protection plate closely; a bottom surface of the supporting rib plate is supported on an upper end face of the bottom plate; two angular septum plates which are arranged at two sides of the T-shaped head and closely cling to the T-shaped head are also mounted on the bottom plate.

The invention discloses a method for dewaxing a ceramic mold, which includes: -before the ceramic mold with a wax pattern enters the dewaxing process, setting a thickness ranging from thin to Thick, differentiated thermal barrier;‑Place the ceramic mold with the wax pattern and thermal barrier in the dewaxing equipment, with the dewaxing port on the ceramic mold facing down, and the thermal barrier on the outside of the ceramic mold The thinnest area is at the bottom of the vertical, and the thickest area is at the top of the vertical; - After the ceramic shell with wax pattern and heat-resistant layer enters the dewaxing process, the heat-resistant layer outside the ceramic shell Control the gradual change of the wax pattern inside the ceramic shell to absorb the heat of dewaxing in the order from bottom to top, so that the wax pattern inside the ceramic shell takes the dewaxing port as the starting point of melting, and realizes the sequence from bottom to top in the order from outside to inside. Dewaxing. It can reduce or directly cancel the auxiliary dewaxing port on the ceramic shell, effectively and reliably guarantee the qualified rate and quality of the dewaxing molding of the ceramic shell.

The invention provides a high-temperature continuous nitrogen heater. The high-temperature continuous nitrogen heater comprises a cylinder, a water cooling positive electrode, a water cooling negative electrode and a heating element; the heating element is mounted on the axis of the cylinder, and one end thereof is connected with the water cooling positive electrode through a slide transfer piece; the water cooling positive electrode is connected with a power supply by penetrating out of a water cooling end surface flange tightly connected to one end of the cylinder; the other end of the heating element penetrates out of a graphite baffle plate at the other end of the closed cylinder; upper and lower two water cooling negative electrodes mounted on the heating element through an electrode transfer disc are connected with the power supply after penetrating out of through holes in the wall of the cylinder; the heating element is a sandwich layer structure consisting of a graphite straight pipe on the outer layer and a graphite straight pipe with a spiral fin on the outer pipe wall on the inner layer; a spiral channel is formed between the outer-layer pipe and the inner-layer pipe through the spiral fin; and a through hole is formed in the slide transfer piece connected to one end of the heating element. The high-temperature continuous nitrogen heater solves the difficulties of thermal expansion of the heating element and high-current electric conduction, and can realize continuous heating of nitrogen currents.