Abstract

Embodiments herein relate to systems and methods that for example may be used for calcination of lime mud, where the input material comprises calcium carbonate and calcination process products comprise calcium oxide and carbon dioxide. The calcination system comprises a heated first calcination chamber 222, configured to convert input material into a first calcination process product comprising gas and a solid compound; at least one, optionally thermally insulated, unheated second calcination chamber 200, configured to receive the first calcination process product, and convert it into a second calcination process product comprising gas and a solid compound; and a separator 118, configured to receive the second calcination process product from the thermally insulated second calcination chamber 200, and separate away the gas from the solid compound.

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors

Abstract

A calcination reactor arrangement (108,300), comprising an electrically heated primary calcination reactor chamber (222,302) having an inlet (312) for input material; a secondary calcination reactor chamber (223,306) configured to receive a flow of material from the primary calcination reactor chamber (222,302) and to maintain a flow of the material through the secondary reactor chamber (223,306).

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• B01J 19/08 - Processes employing the direct application of electric or wave energy, or particle radiationApparatus therefor
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors

Abstract

Embodiments herein relate to a particle separator (110) for use in a calcination system (100). The calcination system (100) comprises an electrically heated calcination reactor (108) configured to convert input material into calcination process products. The particle separator (110) comprises a chamber (401) configured to hold a fluid bed (402) of particles mixed with gas, into which fluid bed (402) gas is fluing from underneath (403), thereby separating smaller particles from larger particles by lifting said smaller particles upwards in the flow of gas. The fluid bed (402) is coupled to a transfer channel (404) arranged to provide the flow of the separated smaller particles mixed with gas to an injection arrangement (106) injecting the provided input material into said electrically heated calcination reactor (108).

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors

Abstract

Embodiments herein relate to a heat recovery arrangement for heat recovery in a system 100 for calcination of lime mud. The heat recovery arrangement comprises: an inlet 402 for receiving incoming gas preheated by excess heat generated by the system 100; an expander 404 for expanding and thereby cooling by expansion said incoming preheated gas; a heat recovery tube 406 arranged in a container 408 comprising quick lime extracted from the system 100, into which recovery tube 410 said expanded and cooled gas is led and heated by the heat from the quick lime; a compressor 412 for compressing and further heating said preheated gas; and an outlet 414 from which said compressed and further heated gas is led out and thereafter decompressed by a diffusor 418 and reentered into the system 100, whereby heat generated from the calcination process is reused.

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors
• F28D 7/16 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Abstract

Embodiments herein relate to a system 100 that for example may be used for calcination of lime mud. The system may comprise an input 102, a media separated heat exchanger 104, an injection arrangement 106, an electrically heated calcination reactor 108, configured to convert input material received by means of said injection arrangement 106 into calcination process products comprising a solid compound in the form of calcium oxide and a gas in the form of carbon dioxide, a heat recovery arrangement 116 configured to receive said calcination process products, to extract heat from said calcination process products and transfer said extracted heat to said input material in said media separated heat exchanger 104 and one or more separators 112, 118 configured to separate said solid compound in the form of calcium oxide and gas in the form of carbon dioxide. Different parts of the system 100 are exemplified in embodiments herein.

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors
• F28D 7/16 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Abstract

Embodiments herein relate to an injection arrangement 106 in a calcination system 100 that for example may be used for calcination of lime mud. The injection arrangement 106 comprises: an injector inlet 202 configured to receive preheated input material, for example lime mud, from a media separated heat exchanger 104 into a fluid conductor configured for transferring said preheated input material to an injector 208, said injector 208 being configured to inject said preheated material into an electrically heated calcination reactor 108 and an injection gas 107 supply is configured to supply gas for transfer and injection of input material into said electrically heated calcination reactor 108. Different parts of the injection arrangement 106 are exemplified in embodiments herein.

IPC Classes  ?

• C04B 2/10 - Preheating, burning, calcining or cooling
• B01J 6/00 - CalciningFusing
• C04B 7/46 - BurningMelting electric
• D21C 11/00 - Regeneration of pulp liquors
• D21C 11/04 - Regeneration of pulp liquors of alkali lye
• D21C 11/12 - Combustion of pulp liquors
• F28D 7/16 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation