Control of mercury emissions from solid fuel combustion
First Claim
1. An apparatus for removing mercury from the products of fuel conversion comprising:
- means for separating a starter batch of carbonaceous sorbent into a contact batch of carbonaceous sorbent and a retained batch of carbonaceous sorbent, the contact batch of carbonaceous sorbent having a particle size distribution of carbonaceous sorbent of d50<
15 microns, where d50 represents 50% of the particles by mass in the entire distribution in the contact batch with the particle size distribution of carbonaceous sorbent in the contact batch after separation being less than the particle size distribution of carbonaceous sorbent in the starter batch before separation and less than the particle size distribution of carbonaceous sorbent in the retained batch;
means for disposing the contact batch of carbonaceous sorbent into contact with the products of fuel conversion at a contact location such that the carbonaceous sorbent of the contact batch adsorbs mercury; and
transport means for transporting carbonaceous sorbent of the contact batch to the contact location in a manner in which, on average, at least ninety percent (90%) of the carbonaceous sorbent of the contact batch is delivered to the contact location in less than thirty (30) minutes following the separation of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch, whereby the carbonaceous sorbent of the contact batch is disposed into contact with the products of fuel conversion at the contact location with substantially no intermediate storage of the carbonaceous sorbent following the conversion of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch.
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Accused Products
Abstract
A system 26 for removing elemental mercury or mercury compounds handles carbonaceous sorbent 28 of a starter batch stored in a silo 30 in an agglomerated state. The sorbent 28 is fed by a feeder 32 to a separation device 34, which comminutes (if necessary) and de-agglomerates the sorbent particles 28 to their primary size distribution. This device 34 may be a particle-particle separator or a jet mill, where compressed air or high-pressure steam is the energy source. The de-agglomerated sorbent 28 of a contact batch created from the starter batch is conveyed by an airsteam for injection at a contact location 66 in a flue gas duct whereat carbonaceous sorbent of the contact batch adsorbs mercury from the flue gas.
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Citations
20 Claims
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1. An apparatus for removing mercury from the products of fuel conversion comprising:
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means for separating a starter batch of carbonaceous sorbent into a contact batch of carbonaceous sorbent and a retained batch of carbonaceous sorbent, the contact batch of carbonaceous sorbent having a particle size distribution of carbonaceous sorbent of d50<
15 microns, where d50 represents 50% of the particles by mass in the entire distribution in the contact batch with the particle size distribution of carbonaceous sorbent in the contact batch after separation being less than the particle size distribution of carbonaceous sorbent in the starter batch before separation and less than the particle size distribution of carbonaceous sorbent in the retained batch;
means for disposing the contact batch of carbonaceous sorbent into contact with the products of fuel conversion at a contact location such that the carbonaceous sorbent of the contact batch adsorbs mercury; and
transport means for transporting carbonaceous sorbent of the contact batch to the contact location in a manner in which, on average, at least ninety percent (90%) of the carbonaceous sorbent of the contact batch is delivered to the contact location in less than thirty (30) minutes following the separation of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch, whereby the carbonaceous sorbent of the contact batch is disposed into contact with the products of fuel conversion at the contact location with substantially no intermediate storage of the carbonaceous sorbent following the conversion of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19, 20)
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10. A method for removing mercury from the products of fuel conversion comprising:
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separating a starter batch of carbonaceous sorbent into a contact batch of carbonaceous sorbent and a retained batch of carbonaceous sorbent, the contact batch of carbonaceous sorbent having a particle size distribution of carbonaceous sorbent of d50<
15 microns, where d50 represents 50% of the particles by mass in the entire distribution in the contact batch with the particle size distribution of carbonaceous sorbent in the contact batch after separation being less than the particle size distribution of carbonaceous sorbent in the starter batch before separation and less than the particle size distribution of carbonaceous sorbent in the retained batch;
disposing the contact batch of carbonaceous sorbent into contact with the products of fuel conversion at a contact location such that the carbonaceous sorbent of the contact batch adsorbs mercury; and
transporting carbonaceous sorbent of the contact batch to the contact location in a manner in which, on average, at least ninety percent (90%) of the carbonaceous sorbent of the contact batch is delivered to the contact location in less than thirty (30) minutes following the separation of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch, whereby the carbonaceous sorbent of the contact batch is disposed into contact with the products of fuel conversion at the contact location with substantially no intermediate storage of the carbonaceous sorbent following the conversion of the carbonaceous sorbent of the starter batch into the carbonaceous sorbent of the contact batch and the carbonaceous sorbent of the retained batch. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification