A unitary refractory ring having a sidewall surrounding and spaced from a center axis, and one or more lifting lugs distributed around the center axis. The lifting lugs extend from an inner face of the sidewall towards the center axis, and are located between lower and upper axial faces of the sidewall. Each lifting lug has a lower lug face extending radially towards the center axis from the inner face of the sidewall, and a backing structure extending upwards along an axial direction from the lower lug face towards the upper axial face of the sidewall. An assembly of refractory rings, and methods for making and assembling refractory rings are also provided.

An exemplary apparatus includes a metal furnace tube having an open first end and an opposite second end. The metal furnace tube includes an inner chamber, a fluid inlet to intake a fluid into the inner chamber, and a fluid outlet to exhaust the fluid from the inner chamber, the inner chamber to support a plurality of substrates within the metal furnace tube. The apparatus includes a first base plate or flange back plate coupling the fluid inlet to the inner chamber; a second base plate or flange back plate coupling the fluid outlet to the inner chamber; and a furnace includes a heater to heat the metal furnace tube, the metal furnace tube being mounted within the furnace and the heater being disposed outside the metal furnace tube.

A unitary refractory ring having a sidewall surrounding and spaced from a center axis, and one or more lifting lugs distributed around the center axis. The lifting lugs extend from an inner face of the sidewall towards the center axis, and are located between lower and upper axial faces of the sidewall. Each lifting lug has a lower lug face extending radially towards the center axis from the inner face of the sidewall, and a backing structure extending upwards along an axial direction from the lower lug face towards the upper axial face of the sidewall. An assembly of refractory rings, and methods for making and assembling refractory rings are also provided.

A construction method of a fiber lining surface of an ethylene cracking furnace includes the following steps: S1, leveling the fiber lining surface; S2, wetting the leveled fiber lining surface; S3, rooting the wetted fiber lining surface; and S4, coating, before the fiber lining surface is dried, high-temperature paint to the fiber lining surface that has been rooted; and reserving multiple expansion sews on the fiber lining surface during the coating process. According to the construction method of the high-temperature paint for full fiber lining structure of the ethylene cracking furnace, the high-temperature paint is firmly bonded with the lining, and will not crack or fall off during use, protecting the full fiber lining by the coating and greatly extending the service life of the lining.

A construction method of a fiber lining surface of an ethylene cracking furnace includes the following steps: S1, leveling the fiber lining surface; S2, wetting the leveled fiber lining surface; S3, rooting the wetted fiber lining surface; and S4, coating, before the fiber lining surface is dried, high-temperature paint to the fiber lining surface that has been rooted; and reserving multiple expansion sews on the fiber lining surface during the coating process. According to the construction method of the high-temperature paint for full fiber lining structure of the ethylene cracking furnace, the high-temperature paint is firmly bonded with the lining, and will not crack or fall off during use, protecting the full fiber lining by the coating and greatly extending the service life of the lining.

To improve the stability of spray application of a monolithic refractory in which a water injector is disposed in a material carrier pipe extending from a material supply device to a distal spray nozzle, and application water is injected from the water injector into a spray material that is being carried through the material carrier pipe, a ratio of a flow volume of an application water carrier gas for carrying the application water to be introduced into the water injector to a flow volume of a spray material carrier gas for carrying the spray material is set to 0.07 to 2, and a compressibility index of the spray material is set to 32% or less. Alternatively, a ratio of a flow volume of an application water carrier gas for carrying the application water to be introduced into the water injector to an application water volume is set to 100 to 1,000.

A ceramic liner can include a monolithic body having a surface portion and a bulk portion. The surface portion can have a thickness less than the total thickness of the monolithic body. The monolithic body can include an amorphous phase. The amorphous phase can be discontinuous. At least one member of the discontinuous phase can be embedded in the surface portion. The bulk portion can be substantially free of the amorphous phase. A method of forming a ceramic liner can include providing a furnace with a coating and a bulk material of the ceramic liner and heating the bulk material and the coating. In an embodiment, a coated lining form can be used to provide the coating. In a particular embodiment, the coating can be transferred to the bulk material from the coated lining form.

A ceramic liner can include a monolithic body having a surface portion and a bulk portion. The surface portion can have a thickness less than the total thickness of the monolithic body. The monolithic body can include an amorphous phase. The amorphous phase can be discontinuous. At least one member of the discontinuous phase can be embedded in the surface portion. The bulk portion can be substantially free of the amorphous phase. A method of forming a ceramic liner can include providing a furnace with a coating and a bulk material of the ceramic liner and heating the bulk material and the coating. In an embodiment, a coated lining form can be used to provide the coating. In a particular embodiment, the coating can be transferred to the bulk material from the coated lining form.

A method of agglomerating bulk ceramic fibers includes mixing the bulk ceramic fibers with water to form wet fibers; mixing the wet fibers with a binder including an organic binder and/or an inorganic binder to form agglomerates; and drying the agglomerates. The agglomerates may be mixed with additional binders and fillers to form an insulating mix that may be used to insulate a furnace or other heat source. A foaming nozzle may be used for the application of agglomerates. A foaming agent and water are air atomized within the foaming nozzle and the resulting foam is mixed into pneumatically conveyed agglomerates, which result results in a lightweight refractory material layer on a target substrate.

A furnace for melting vitrifiable material, in particular glass, employs a submerged burner, the furnace including a wall cooled by a cooling fluid, the face of the wall facing toward the interior of the furnace having, before vitrifiable material is melted in the furnace, an attachment texture for so-called self-crucible devitrified vitrifiable material.