Process apparatus with output valve and operation thereof

• US 8,443,724 B2
• Filed: 07/16/2010
• Issued: 05/21/2013
• Est. Priority Date: 07/17/2009
• Status: Expired due to Fees

• Current Assignee: Mascoma Canada Inc.
• Original Assignee: Mascoma Canada Inc.
• Inventors: Burke, Murray J.
• Primary Examiner(s): Nguyen, Jimmy T
• Application Number:
  US12/838,041
• Publication Number:
  US 20110011282A1
• Time in Patent Office: 1,040 Days
• Field of Search: 100/50, 100/92, 100/337, 100/111, 100/147, 100/148, 100/149, 100/150, 100/45, 162/246
• US Class Current: 100/148
• CPC Class Codes: B01J 2208/0007 Pressure measurement
• CPC Class Codes: B01J 2208/0061 Controlling the level
• CPC Class Codes: B01J 2208/00699 Moisture content regulation
• CPC Class Codes: B01J 2208/00752 Feeding
• CPC Class Codes: B01J 2219/00198 at the reactor inlet
• CPC Class Codes: B01J 2219/00231 at the reactor inlet
• CPC Class Codes: B01J 3/02 Feed or outlet devices therefor
• CPC Class Codes: B01J 8/002 with a moving instrument
• CPC Class Codes: B01J 8/0045 by means of a rotary device in the flow channel
• CPC Class Codes: B30B 11/241 Drive means therefor; screw bearings
• CPC Class Codes: B30B 11/265 with precompression means
• CPC Class Codes: C10L 5/44 on vegetable substances
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel
• CPC Class Codes: Y02E 50/30 Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

An apparatus is provided for treating a loose fibrous solid organic feedstock. The apparatus includes a reactor vessel and a compressor operable to introduce feedstock at elevated pressure into the reactor chamber. The apparatus includes means for controlling and modulating moisture level within the reactor. The apparatus includes an outflow or discharge assembly that has its own feeder or drive for packing feedstock into a discharge accumulator. The discharge accumulator feeds an outflow valve, in this case a uni-directional rotation ball valve operated by a servo motor. Discharge from the valve may be carried through a diffuser into a settling cyclone. In operation the ball valve is rotated to open and close the outflow passageway, the rate of rotation being variable in real time. The rate of rotation may be a function of the pressure or other parameters sensed in the reaction vessel, and, particularly, in the accumulator immediately upstream of the ball valve, and of proxy sensed values such as discharge feeder motor current.

Claims

1. An apparatus for processing fibrous organic feedstock, said apparatus comprising:

a compressor operable to raise the fibrous organic feedstock to a processing pressure;

a reactor vessel through which to process the fibrous organic feedstock under pressure;

a discharge assembly mounted to receive the fibrous organic feedstock of the reactor vessel;

said discharge assembly including a collector and a drive member operable to pack the fibrous organic feedstock into the collector;

an outflow governor mounted to the collector, the outflow governor being movable between a closed position for retaining feedstock in the collector and an open position for permitting egress of the feedstock from the collector;

said outflow governor having an outflow governor drive;

said outflow governor drive having a continuously variable speed control; and

said variable speed control is operable to alter both the duration of the outflow governor in the open position and the ratio of time spent in the open and closed positions.

2. The apparatus of claim 1 wherein the variable speed control is operable to cycle the outflow governor between open and closed conditions in excess of 40 times per minute.

3. The apparatus of claim 1 wherein the apparatus includes at least one of:

(a) sensors operable to monitor pressure upstream of said outflow governor and said control is connected to cause operation of said outflow governor in response to pressure signals; and

(b) sensors to monitor feedstock load in the collector, and said control is connected to cause operation of said outflow governor in response to load sensed in the collector.

4. The apparatus of claim 1 wherein said apparatus includes at least one heat transfer interface at which heat may be added to said reactor vessel and any contents thereof.

5. The apparatus of claim 1 wherein said apparatus includes at least one moisture modification input by which to modulate moisture level within said reactor vessel.

6. The apparatus of claim 1 wherein said outflow governor is a ball valve.

7. The apparatus of claim 6 wherein said outflow governor drive is a motor mounted to turn said ball valve continuously in one direction.

8. The apparatus of claim 1 wherein said apparatus includes at least one of

(a) a diffuser connected to receive outflow from said outflow governor;

and

(b) a cyclone is connected downstream of said outflow governor.

9. The apparatus of claim 1 wherein said outflow governor is connected to open in response to presence of feedstock in the collector and sensing of a minimum outflow pressure threshold.

10. The apparatus of claim 1 wherein said controller has control logic to do any one of:

(a) shorten outflow governor closed time when resistance to packing of the outfeed collector increases;

(b) lengthen outflow governor open time when resistance to packing of the outfeed collector increases;

(c) increase the ratio of outflow governor open time to outflow governor closed time as proportions of total outflow governor cycle time;

(d) bias said outflow governor to reduce outflow open time to a minimum threshold value; and

(e) immediately to move said outflow governor to the closed position when pressure upstream therefrom falls below a designated set point value.