Emission abatement apparatus for processing of particulates and method of using same

Patent metadata

Field	Value
Publication number	US-11566842-B2
Application number	US-201917055548-A
Country	US
Kind code	B2
Filing date	May 13, 2019
Priority date	May 15, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A cement manufacturing plant can include at least one emission abatement mechanism. In some embodiments, the emission abatement mechanism can utilize a plurality of pulsed gases passed through a reactor to treat a solid particulate material passed through the reactor. The pulsed reactant gas can be pulsed through the reactor so that the pulsed gas passes from a middle portion of the reactor to a first end of the reactor at which the solid particulates can be fed into the reactor. In some embodiments, the reactant gas can be output from the first end to a down corner or other reactant gas conduit for transport to a treatment device.

First claim

What is claimed is:

1. A cement manufacturing apparatus comprising:
a pre-heater connected to a calciner to pre-heat cement raw meal to the calciner, the pre-heater comprising:
a first separator device;
a second separator device;
an emission abatement apparatus configured to mitigate Hg, NH3, SO2, HCl and/or total organic carbon (TOC) emissions from the cement raw meal, the emission abatement apparatus being positioned between the first separator device and the second separator device, the emission abatement apparatus comprising:
a reactor having a first end, a second end opposite the first end, and at least one middle portion between the first end and the second end;
the first end of the reactor connected to a cement raw meal conduit so that the cement raw meal output from the first separator device is feedable to the first end of the reactor;
the second end of the reactor connected to a flue gas conduit such that the cement raw meal passed through the reactor is passable from the second end of the reactor to the flue gas conduit so that the cement raw meal is directed to the second separator device via the flue gas conduit;
the at least one middle portion of the reactor being connectable to a source of reactant gas such that reactant gas from the source of reactant gas is feedable into the middle portion of the reactor in a plurality of pulses; and
the reactor further comprising a bypass passageway extending from the first end of the reactor to the second end of the reactor, the bypass passageway positioned above the middle portion of the reactor.

2. The cement manufacturing apparatus of claim 1 , wherein the at least one middle portion of the reactor is comprised of an intermediate section of the reactor between the first end of the reactor and the second end of the reactor and the middle portion of the reactor is below the first end of the reactor and is below the second end of the reactor.

3. The cement manufacturing apparatus of claim 2 , wherein a controller is configured such that the gas flow control mechanism provides the plurality of pulses of the reactant gas so that each pulse has a pre-selected pulse time period at which the reactant gas is fed into the middle portion of the reactor and immediately after the pre-selected pulse time the reactant gas is stopped being fed into the middle portion of the reactor for a cessation time period that runs immediately after the pre-selected pulse time ends.

4. The cement manufacturing apparatus of claim 3 , wherein the controller is configured to provide pulses having a pre-selected pulse time of up to 0.01 seconds, 1 microsecond, 1 millisecond, 5 milliseconds, or 1 second.

5. The cement manufacturing apparatus of claim 2 , wherein the at least one middle portion of the reactor is connected to a transport gas source such that transport gas is feedable into the middle portion of the reactor in a plurality of pulses such that the transport gas is passable from the middle portion of the reactor to the second end of the reactor.

6. The cement manufacturing apparatus of claim 5 , wherein the at least one middle portion of the reactor is connected to the source of reactant gas such that the reactant gas passes from the middle portion of the reactor to the first end of the reactor.

7. The cement manufacturing apparatus of claim 2 , wherein the reactor has a generally U-shape or a generally V-shape; and wherein the middle portion is a central section of the reactor.

8. The cement manufacturing apparatus according to claim 1 , wherein the cement manufacturing apparatus further comprises a controller connected to a reactant gas flow control mechanism.

9. The cement manufacturing apparatus, according to claim 1 , wherein a gas conduit for outputting a transport gas with any elements stripped from the cement raw meal is connected to the bypass passageway.

Assignees

• Smidth As F L

Inventors

• Schmidt Iver Blankenberg
• Jensen Lars Skaarup

Classifications

• C04B7/364

  Avoiding environmental pollution during cement-manufacturing · CPC title

• F27D17/008

  Mechanical Engineering · mapped topic

• F27B7/2033 Primary

  with means for precalcining the raw material · CPC title

• C04B7/434

  Preheating with addition of fuel, e.g. calcining · CPC title

• F27D17/20 Primary

  Arrangements for treatment or cleaning of waste gases · CPC title