Discharge system to remove solids from a vessel

A discharge system for removing solids from a fluidized bed pressure vessel, the discharge system comprising:

• (a) four settling vessels arranged in parallel;
• (b) a discharge line fluidly connecting a fluidized bed pressure vessel to at least one of the settling vessels;
• (c) a primary discharge valve to control a discharge flow of a fluid mixture to the at least one of the settling vessels, wherein at least two settling vessels are fluidly connected to the fluidized bed pressure vessel through a single common discharge line and a single common primary discharge valve;
• (d) a vent line fluidly connecting the fluidized bed pressure vessel and at least one of the settling vessels;
• (e) a primary vent valve to control a vent flow through the vent line, wherein at least two settling vessels are fluidly connected to the fluidized bed pressure vessel through a single common vent line and a single common primary vent valve;
• (f) a secondary vent valve in series with the primary vent valve between the fluidized bed pressure vessel and at least one settling vessel;
• (g) four crosstie lines, wherein at least one crosstie line fluidly connects at least two of the settling vessels;
• (h) at least one crosstie valve to control a crosstie flow through the crosstie line;
• and
• (i) a primary exit valve to control an exit flow of the fluid mixture exiting at least one of the settling vessels,
• wherein the discharge system is absent a transfer tank, and wherein the plurality of settling vessels are absent a filter element;
• and
• wherein the discharge system comprises a first set of crosstie lines comprising a first and a second of the four crosstie lines, a second set of crosstie lines comprising a third and a fourth of the four crosstie lines, and at least two multi-port valves, wherein the at least two multi-port valves fluidly connect the first set of crosstie lines to the second set of crosstie lines.