<sec id="sec_5.2.2"><label>5.2.2</label>
<p>The fundamental system configuration decisions and major components for a post-combustion NOx treatment system include the following.</p>
<list id="L1" list-type="alpha-lower">
<list-item><label>a)</label><p>Type of post-combustion NOx treatment:</p>
<list id="L2" list-type="order">
<list-item><label>1)</label><p>SNCR;</p></list-item>
<list-item><label>2)</label><p>SCR; or</p></list-item>
<list-item><label>3)</label><p>combination of SNCR and SC.</p></list-item></list>
</list-item>
<list-item><label>b)</label><p>Type of Ammonia or Urea Flow Control Unit (AFCU):</p></list-item>
<list-item><label>c)</label><p>SNCR with one of the following reactant and carrier streams:</p>
<list id="L3" list-type="order">
<list-item><label>1)</label><p>aqueous ammonia based with one of the following reactant charge methods:</p>
<list id="L4" list-type="roman-lower">
<list-item><label>i)</label><p>mixed with a heated air stream in an ammonia vaporizer/mixer, or directly vaporized in a once through vaporizer before mixing with one of the following carriers:</p>
<list id="L5" list-type="roman-upper">
<list-item><label>I)</label><p>air, or</p></list-item>
<list-item><label>II)</label><p>steam.</p></list-item></list>
</list-item></list>
</list-item>
<list-item><label>2)</label><p>anhydrous ammonia based with the following reactant charge method:</p>
<list id="L6" list-type="roman-lower">
<list-item><label>i)</label><p>vapor mixed directly with one of the following carriers:</p>
<list id="L7" list-type="roman-upper">
<list-item><label>I)</label><p>air, or</p></list-item>
<list-item><label>II)</label><p>steam.</p></list-item></list>
</list-item>
<list-item><label>ii)</label><p>urea based with the following reactant charge method:</p></list-item></list>
</list-item></list>
</list-item></list>
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