The present invention concerns an apparatus and a method for manufacturing a product from a raw material. The apparatus comprises a rotary kiln having a first rotary kiln end and a second rotary kiln end, and a cooling unit which is connected to the second rotary kiln end, wherein a process direction is provided leading through the rotary kiln from the first rotary kiln end to the second rotary kiln end and further through the cooling unit, wherein the cooling unit is configured to transport the product in the process direction through the cooling unit for cooling the product, the rotary kiln comprising a burning unit at the second rotary kiln end, the burning unit being configured to receive a flammable material and an ignition gas to create heat inside the rotary kiln and to produce a combustion gas containing carbon dioxide, the rotary kiln being configured to transport raw material received at the first rotary kiln end in the process direction towards the second rotary kiln end, and, by using the heat, to transform the raw material into the product and into a resigning gas comprising carbon dioxide, characterized in that the apparatus comprises a gas outlet configured to remove an exhaust gas comprising the resigning gas and the combustion gas from the rotary kiln, and that the cooling unit is configured to transport a cooling gas in the process direction over the product.

The present invention concerns an apparatus and a method for manufacturing a product from a raw material. The apparatus comprises a rotary kiln having a first rotary kiln end and a second rotary kiln end, and a cooling unit which is connected to the second rotary kiln end, wherein a process direction is provided leading through the rotary kiln from the first rotary kiln end to the second rotary kiln end and further through the cooling unit, wherein the cooling unit is configured to transport the product in the process direction through the cooling unit for cooling the product, the rotary kiln comprising a burning unit at the second rotary kiln end, the burning unit being configured to receive a flammable material and an ignition gas to create heat inside the rotary kiln and to produce a combustion gas containing carbon dioxide, the rotary kiln being configured to transport raw material received at the first rotary kiln end in the process direction towards the second rotary kiln end, and, by using the heat, to transform the raw material into the product and into a resigning gas comprising carbon dioxide, characterized in that the apparatus comprises a gas outlet configured to remove an exhaust gas comprising the resigning gas and the combustion gas from the rotary kiln, and that the cooling unit is configured to transport a cooling gas in the process direction over the product.

A furnace system includes a regenerative furnace with a melting tank and first and second regenerators. In a forward operating mode, combustion air enters and travels through the first regenerator before exiting the first regenerator into the melting tank while exhaust fluids exit the melting tank into the second regenerator and travels through the second regenerator before exiting the second regenerator. In a reverse operating mode, the flow is reversed. The system also includes a preheater for preheating materials supplied to the melting tank. Portions of the combustion air traveling through the first regenerator in the forward operating mode and the second regenerator in the reverse operating mode are diverted before entering the melting tank and mixed with fluids exhausted from the fluid outlet of the preheater for delivery to the fluid inlet of the preheater.

There is provided a kiln assembly comprising a kiln having an external heat supply and a heat treatment chamber configured to contain material to be processed, the heat treatment chamber including a hot section wherein the material flowing therein is heated by the external heat supply; a pre-heating section; a cooling section; and a heat transfer conduit circuit. The pre-heating, hot, and cooling sections are in material communication. The heat transfer conduit circuit forms a closed loop in which circulates a heat transfer fluid and has a pre-heating segment and a cooling segment respectively in heat exchange with the pre-heating and the cooling sections. The heat transfer fluid respectively releases heat to the material located in the pre-heating section and absorbs heat from the material located in the cooling section. There is also provided a method for recovering heat during operation of a kiln assembly.

There is provided a kiln assembly comprising a kiln having an external heat supply and a heat treatment chamber configured to contain material to be processed, the heat treatment chamber including a hot section wherein the material flowing therein is heated by the external heat supply; a pre-heating section; a cooling section; and a heat transfer conduit circuit. The pre-heating, hot, and cooling sections are in material communication. The heat transfer conduit circuit forms a closed loop in which circulates a heat transfer fluid and has a pre-heating segment and a cooling segment respectively in heat exchange with the pre-heating and the cooling sections. The heat transfer fluid respectively releases heat to the material located in the pre-heating section and absorbs heat from the material located in the cooling section. There is also provided a method for recovering heat during operation of a kiln assembly.

The present application discloses a furnace for melting particulate materials configured with a furnace chamber, a feed hopper, a protrusion and at least one burner. The particulate materials fall along the protrusion into a melting tank, and flue gas generated by the burner flows upwardly, thereby preheating the particulate materials. The process of utilizing the flue gas to preheat the particulate materials begins with the flue gas in the high temperature section. The efficiency of preheating the particulate materials with the flue gas greatly improves and the heat loss reduces.

The present application discloses a furnace for melting particulate materials configured with a furnace chamber, a feed hopper, a protrusion and at least one burner. The particulate materials fall along the protrusion into a melting tank, and flue gas generated by the burner flows upwardly, thereby preheating the particulate materials. The process of utilizing the flue gas to preheat the particulate materials begins with the flue gas in the high temperature section. The efficiency of preheating the particulate materials with the flue gas greatly improves and the heat loss reduces.

A method of producing a cementitious material, includes providing a raw material, heating the raw material to a temperature of 100-120 C., the heating including a first heating including heating the raw material to a first temperature in heat exchange with a heat exchanger fluid circulating in a first circulation loop, a second heating including heating the raw material to a second temperature in heat exchange with a heat exchanger fluid circulating in a second circulation loop, the second temperature being higher than the first temperature, calcining the heated raw material in a calciner to obtain a calcined material, cooling the calcined material to a temperature of <150 C. for obtaining the cementitious material, wherein sensible heat removed from the calcined material in the cooling is used as a heat source for heating the heat exchanger fluid circulating in the first and/or second circulation loop.

A method of producing a cementitious material, includes providing a raw material, heating the raw material to a temperature of 100-120 C., the heating including a first heating including heating the raw material to a first temperature in heat exchange with a heat exchanger fluid circulating in a first circulation loop, a second heating including heating the raw material to a second temperature in heat exchange with a heat exchanger fluid circulating in a second circulation loop, the second temperature being higher than the first temperature, calcining the heated raw material in a calciner to obtain a calcined material, cooling the calcined material to a temperature of <150 C. for obtaining the cementitious material, wherein sensible heat removed from the calcined material in the cooling is used as a heat source for heating the heat exchanger fluid circulating in the first and/or second circulation loop.

The present invention relates to a method for incineration of combustible waste during the manufacture of cement clinker where cement raw meal is preheated and calcined in a preheater (1) with a calciner (3), burned into clinker in a kiln (5) and cooled in a subsequent clinker cooler (7), in which method the waste is incinerated in a separate compartment (9) subject to simultaneous supply of hot air, the exhaust gases produced during the waste incineration process being vented to the preheater for heating the cement raw meal, and the slag generated during the waste incineration process being extracted from the compartment, the waste is introduced via a waste inlet (11) onto a supporting surface (21) incorporated in the compartment (9) and in that, during incineration, the waste is transported through the compartment to the outlet (23) of the compartment along a circular path, characterized in that the compartment (9) is arranged at a distance from said calciner (3) or a preheater tower by means of a material chute (40), said material chute (40) enters a downward sloping duct, said duct carries exit gas from said compartment (9) and non-combustible material from waste fuel firing in said compartment (9) down into the calciner or preheater tower.