Noise reducing mortar composition
US-2022220034-A1 · Jul 14, 2022 · US
A method for reducing combustion temperature and thermal radiation within a lime kiln
US2023144517A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023144517-A1 |
| Application number | US-202117916468-A |
| Country | US |
| Kind code | A1 |
| Filing date | Apr 5, 2021 |
| Priority date | Apr 3, 2020 |
| Publication date | May 11, 2023 |
| Grant date | — |
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Abstract
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A method for reducing combustion temperature and/or thermal radiation within a lime kiln of a pulp production plant, which kiln is a rotary kiln having a kiln tube (1) internally covered with refractory tiles (13) and having a burner (2) supplied by fuel for heating of the rotary kiln by a flame (3). The effects are achieved by supplying calcium carbonate containing particles to the flame (3) and/or to surrounding area around the flame (3). The particles are supplied into the rotary kiln by at least one lance (9) to the upper part of the flame (3). Calcium oxide containing particles may be supplied to the rotary kiln to areas surrounding the flame (3) for reducing the thermal radiation to an area over the flame (3) and/or to the area at the side of the flame (3), where the refractory tiles (13) of the kiln are rotating downwards.
First claim
Opening claim text (preview).
1 . A method for reducing combustion temperature and/or thermal radiation within a lime kiln of a pulp production plant, wherein the lime kiln is a rotary kiln having a rotary kiln tube internally covered with refractory tiles and a burner attached to a burner end of the rotary kiln, the method comprising: supplying the burner with fuel; heating the rotary kiln by a flame produced by the burner burning the fuel; supplying particles containing calcium carbonate to the flame and/or to an area surrounding the flame. 2 . The method of claim 1 , wherein the step of supplying the particles includes supplying at least some of the particles into the rotary kiln by at least one lance. 3 . The method of claim 1 , wherein the step of supplying the particles includes supplying a flow the particles and directly the flow to an upper part of the flame. 4 . The method of claim 3 , wherein the lance includes a nozzle having an outwards increasing internal cross sectional area, and the flow of the particles flows through the nozzle. 5 . The method of claim 1 , wherein the flow of the particles is directed to area over the flame and/or to an area at a side of the flame facing a side of the rotary kiln tube where the refractory tiles are rotating downwards. 6 . The method of claim 1 , wherein the fuel of the burner is gaseous. 7 . The method of claim 1 , wherein the fuel includes methane and/or hydrogen. 8 . The method of claim 1 , wherein at least some of the particles supplied to the rotary kiln are obtain from a dust separating device. 9 . The method of claim 1 , wherein at least some of the particles supplied to the rotary kiln are ground to particles from supplied raw material. 10 . The method of claim 1 , wherein the step of supplying the particles includes supplying the particles with primary combustion air and/or secondary combustion air supplied to the burner of the rotary kiln. 11 . The method of claim 1 , wherein the combustion is performed only in one phase. 12 . The method of claim 1 , wherein a rate of supply of the particles is controlled by at least one of: measuring a level of NOx emissions, measuring a quality of product, measuring a temperature of the flame and an observed form of the flame. 13 . The method of claim 1 , wherein the particles supplied to and/or around the flame have no more than 25% per weight water content. 14 . The method of claim 1 , wherein the particles supplied to and/or around the flame have no more than 15% per weight water content.
Assignees
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Classifications
Arrangements for using waste heat · CPC title
Introducing gas into the drum axially or through the wall · CPC title
Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills · CPC title
Measuring NOx content in flue gas · CPC title
- F23N5/265Primary
using electronic means · CPC title
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- What does patent US2023144517A1 cover?
- A method for reducing combustion temperature and/or thermal radiation within a lime kiln of a pulp production plant, which kiln is a rotary kiln having a kiln tube (1) internally covered with refractory tiles (13) and having a burner (2) supplied by fuel for heating of the rotary kiln by a flame (3). The effects are achieved by supplying calcium carbonate containing particles to the flame (3) a…
- Who is the assignee on this patent?
- Andritz Oy
- What technology area does this patent fall under?
- Primary CPC classification F23N5/265. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu May 11 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).