A system, comprising: a solids packing device comprising: a first channel configured to receive a solid feed with a first range of sizes; a second channel configured to receive transport assistance particles with a second range of sizes, wherein the first range of sizes is different from the second range of sizes; and a third channel (78, 83) configured to receive and mix the solid feed and the TAP to provide a solid feed-TAP mixture with the TAP filling interspatial spaces between the solid feed; and a solid feed pump, comprising: a housing; a passage disposed within the housing; a solid feed inlet configured to receive the solid feed-TAP mixture (43, 66) from the third channel and provide the solid feed-TAP mixture (43, 66) to the passage; and a solid feed outlet coupled to the passage; characterized in that wherein a second portion of the second channel of the solids packing device is circumferentially disposed about a first portion of the first channel thereof and wherein the solids packing device comprises a first vibrator disposed on an external surface of the solids packing device, a second vibrator disposed within the solids packing device in a flow path of the solid feed-TAP mixture, an external worm gear drive configured to rotate internal spiral flutes within the third channel (78, 83), or any combination thereof, wherein the first or second vibrator (76, 80) is configured to facilitate packing of the solid feed and the TAP. a solids packing device comprising: a first channel configured to receive a solid feed with a first range of sizes; a second channel configured to receive transport assistance particles with a second range of sizes, wherein the first range of sizes is different from the second range of sizes; and a third channel (78, 83) configured to receive and mix the solid feed and the TAP to provide a solid feed-TAP mixture with the TAP filling interspatial spaces between the solid feed; and a first channel configured to receive a solid feed with a first range of sizes; a second channel configured to receive transport assistance particles with a second range of sizes, wherein the first range of sizes is different from the second range of sizes; and a third channel (78, 83) configured to receive and mix the solid feed and the TAP to provide a solid feed-TAP mixture with the TAP filling interspatial spaces between the solid feed; and a solid feed pump, comprising: a housing; a passage disposed within the housing; a solid feed inlet configured to receive the solid feed-TAP mixture (43, 66) from the third channel and provide the solid feed-TAP mixture (43, 66) to the passage; and a housing; a passage disposed within the housing; a solid feed inlet configured to receive the solid feed-TAP mixture (43, 66) from the third channel and provide the solid feed-TAP mixture (43, 66) to the passage; and a solid feed outlet coupled to the passage; characterized in that wherein a second portion of the second channel of the solids packing device is circumferentially disposed about a first portion of the first channel thereof and wherein the solids packing device comprises a first vibrator disposed on an external surface of the solids packing device, a second vibrator disposed within the solids packing device in a flow path of the solid feed-TAP mixture, an external worm gear drive configured to rotate internal spiral flutes within the third channel (78, 83), or any combination thereof, wherein the first or second vibrator (76, 80) is configured to facilitate packing of the solid feed and the TAP.