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A hopper apparatus comprises a movable wall comprising opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly, and movement control devices configured and positioned to move the opposing walls along the support

A hopper apparatus comprises a movable wall comprising opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly, and movement control devices configured and positioned to move the opposing walls along the support assembly to control dimensions of a discharge outlet at least partially defined by converging ends of the opposing walls; a liner assembly comprising liner structures at least partially overlying inner surfaces of the opposing walls and configured to remain at least partially stationary relative to the opposing walls during movement of the opposing walls; and pressure sensors between the inner surfaces of opposing walls and portions of the liner structures thereover. A bulk solids processing system and a method of processing a bulk solid are also described.

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1. A hopper apparatus, comprising: a movable wall assembly comprising: opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly; andmovement control devices configured and positioned to move the opposing walls alo

1. A hopper apparatus, comprising: a movable wall assembly comprising: opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly; andmovement control devices configured and positioned to move the opposing walls along the support assembly to control dimensions of a discharge outlet at least partially defined by converging ends of the opposing walls;a liner assembly comprising liner structures at least partially overlying inner surfaces of the opposing walls and configured to remain at least partially stationary relative to the opposing walls during movement of the opposing walls; andpressure sensors between the inner surfaces of the opposing walls and portions of the liner structures thereover. 2. The hopper apparatus of claim 1, wherein the opposing walls of the movable wall assembly are slidably mounted to opposing structures of the support assembly oriented at the acute angles. 3. The hopper apparatus of claim 2, wherein the movement control devices of the movable wall assembly are configured and positioned to reversibly move the opposing walls of the movable wall assembly along the opposing structures of the support assembly. 4. The hopper apparatus of claim 1, wherein the opposing walls of the movable wall assembly are each independently oriented at an angle within a range of from about 10 degrees to about 45 degrees relative to the central vertical axis of the support assembly. 5. The hopper apparatus of claim 1, wherein the movable wall assembly further comprises wheel assemblies connected to the converging ends of the opposing walls. 6. The hopper apparatus of claim 1, wherein the liner structures of the liner assembly wrap around the converging ends of the opposing walls of the movable wall assembly. 7. The hopper apparatus of claim 1, wherein the liner structures comprise metal alloy sheets. 8. The hopper apparatus of claim 1, wherein the liner assembly further includes actuator devices configured and positioned to maintain the liner structures in a substantially taut state around the opposing walls of the movable wall assembly during movement of the opposing walls. 9. The hopper apparatus of claim 1, wherein the pressure sensors are configured and positioned to measure compression pressure proximate the converging ends of the opposing walls. 10. The hopper apparatus of claim 1, wherein the pressure sensors are configured and positioned to detect a bulk solid fill level within the hopper apparatus. 11. A bulk solids processing system, comprising: a source of at least one bulk solid;a hopper apparatus configured and positioned to receive the at least one bulk solid from the source and comprising: a movable wall assembly comprising: opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly; andmovement control devices configured and positioned to move the opposing walls along the support assembly to control dimensions of a discharge outlet at least partially defined by converging ends of the opposing walls;a liner assembly comprising liner structures at least partially overlying inner surfaces of the opposing walls and configured to remain at least partially stationary relative to the opposing walls during movement of the opposing walls; andpressure sensors between the inner surfaces of opposing walls and portions of the liner structures thereover;a computer assembly operatively associated with and configured to receive measurement data from the hopper apparatus; andcontrol logic in communication with the computer assembly and configured to verify the operability of and control the hopper apparatus and to characterize the flowability of the at least one bulk solid at least partially based on the measurement data received by the computer assembly. 12. The bulk solids processing system of claim 11, wherein the source of at least one bulk solid comprises one or more of a screw conveyor, a drag conveyor, and a vacuum conveyor. 13. The bulk solids processing system of claim 11, wherein the control logic is configured to operate the hopper apparatus in a plurality of modes of operation. 14. The bulk solids processing system of claim 13, wherein the plurality of modes of operation comprise: a first mode of operation configured to characterize the flowability of a stationary volume of the at least one bulk solid from within the hopper apparatus and to adjust positions of the opposing walls of the movable wall assembly to facilitate flow of the at least one bulk solid from the hopper apparatus; anda second mode of operation configured to characterize the flowability of a mobile volume of the at least one bulk solid the hopper apparatus and to adjust positions of the opposing walls of the movable wall assembly to facilitate substantially continuous, uniform flow of the at least one bulk solid from the hopper apparatus. 15. The bulk solids processing system of claim 14, wherein the first mode of operation is configured to determine rheological properties of the at least one bulk solid at least partially based on pressure measurements from the pressure sensors and on a minimum width of the discharge outlet of the hopper apparatus facilitating flow of the at least one bulk solid from the hopper apparatus. 16. The bulk solids processing system of claim 14, wherein the second mode of operation is configured to determine rheological properties of the at least one bulk solid at least partially based on pressure measurements from the pressure sensors and on changes to a width of the discharge outlet of the hopper apparatus during the substantially continuous, uniform flow of the at least one bulk solid from the hopper apparatus. 17. The bulk solids processing system of claim 14, wherein the second mode of operation is configured to adjust positions of the opposing walls of the movable wall assembly at least partially based on a fill level of the at least one bulk solid within the hopper apparatus. 18. A method of processing a bulk solid, comprising: determining flowability characteristics of at least one bulk solid using a bulk solids processing system, the bulk solids processing system comprising: a hopper apparatus operatively associated with a bulk solid source and comprising: a movable wall assembly comprising: opposing walls movably connected to a support assembly and oriented at acute angles relative to a central vertical axis of the support assembly; andmovement control devices configured and positioned to move the opposing walls along the support assembly to control dimensions of a discharge outlet at least partially defined by converging ends of the opposing walls;a liner assembly comprising liner structures at least partially overlying inner surfaces of the opposing walls and configured to remain at least partially stationary relative to the opposing walls during movement of the opposing walls; andpressure sensors between the inner surfaces of the opposing walls and portions of the liner structures thereover;a computer assembly operatively associated with and configured to receive measurement data from the hopper apparatus; andcontrol logic in communication with the computer assembly and configured to verify the operability of and control the hopper apparatus and to characterize the flowability of the at least one bulk solid at least partially based on the measurement data received by the computer assembly; andcontrolling, using the control logic in combination with the computer assembly, a flow rate of the at least one bulk solid from the hopper apparatus at least partially based on flowability characteristics of the at least one bulk solid as determined by the computer assembly at least in part responsive to output from the pressure sensors. 19. The method of claim 18, wherein determining flowability characteristics of at least one bulk solid using a bulk solids processing system comprises: delivering at least one bulk solid into the hopper apparatus;measuring pressures applied to the hopper apparatus by the at least one bulk solid using the pressure sensors to determine a pressure distribution for the at least one bulk solid within the hopper apparatus; anddetermining rheological properties of the at least one bulk solid at least partially based on the determined pressure distribution. 20. The method of claim 19, wherein measuring pressures applied to the hopper apparatus by the at least one bulk solid comprises measuring the pressures applied to hopper apparatus while the at least one bulk solid is in a substantially stationary state within the hopper apparatus. 21. The method of claim 20, further comprising: measuring a minimum width of the discharge outlet effectuating flow of the at least one bulk solid from the hopper apparatus to determine a critical arching width of the at least one bulk solid; anddetermining additional rheological properties of the at least one bulk solid at least partially based on the critical arching width of the at least one bulk solid. 22. The method of claim 19, wherein measuring pressures applied to the hopper apparatus by the at least one bulk solid comprises continuously measuring the pressures applied to the hopper apparatus while the at least one bulk solid is in a substantially mobile state within the hopper apparatus. 23. The method of claim 22, further comprising: continuously measuring widths of the discharge outlet effectuating substantially continuous flow of the at least one bulk solid from the hopper apparatus at a predetermined flow rate; anddetermining additional rheological properties of the at least one bulk solid at least partially based on the continuously measured widths of the discharge outlet. 24. The method of claim 18, wherein controlling a flow rate of the at least one bulk solid from the hopper apparatus comprises: continuously monitoring a fill level of the at least one bulk solid within the hopper apparatus to determine if the flow rate of the at least one bulk solid from the hopper apparatus is within predetermined flow rate boundaries; andautomatically adjusting positions of the opposing walls of the movable wall assembly if the flow rate of the at least one bulk solid from the hopper apparatus is outside of the predetermined flow rate boundaries to modify dimensions of the discharge outlet of the hopper apparatus until the flow rate of the at least one bulk solid from the hopper apparatus is within the predetermined flow rate boundaries. 25. The method of claim 24, wherein continuously monitoring a fill level of the at least one bulk solid within the hopper apparatus comprises monitoring the fill level of the at least one bulk solid within the hopper apparatus using at least a portion of the pressure sensors.