IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0068539
(2011-05-13)
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등록번호 |
US-8117764
(2012-02-21)
|
발명자
/ 주소 |
- Ness, Mark A
- Coughlin, Matthew P
- Wheeldon, John M
- Johnson, Adam M
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
6 |
초록
▼
A control system for controlling the utilization of heated waste streams for fluidizing particulate matter such as coal in a fluidizing bed dryer. The control system includes a number of graphic user interfaces that allow an operator to more easily monitor and/or control the various regulator device
A control system for controlling the utilization of heated waste streams for fluidizing particulate matter such as coal in a fluidizing bed dryer. The control system includes a number of graphic user interfaces that allow an operator to more easily monitor and/or control the various regulator devices. The control system controls coal handling or transportation, fluid handling or flow, and the discharge of discarded or separated coal from the dryer.
대표청구항
▼
1. A method of controlling the reduction in moisture of a particulate material within a dryer apparatus in operative communication with at least one heated waste stream, and a source of particulate material, the method comprising operating computing apparatus to automatically perform the steps of: (
1. A method of controlling the reduction in moisture of a particulate material within a dryer apparatus in operative communication with at least one heated waste stream, and a source of particulate material, the method comprising operating computing apparatus to automatically perform the steps of: (a) substantially continuously feeding particulate material into the dryer apparatus for moisture reduction;(b) regulating the flow of at least one heated waste stream into the dryer apparatus for fluidizing and reducing the moisture in the particulate material wherein regulating the flow of the at least one heated waste streams into the dryer apparatus includes the steps of: (i) determining an amount of energy available to evaporate moisture from the particulate material by receiving at least one signal from at least one of the group consisting essentially of a thermal sensor, a flow sensor, a pressure sensor, a level sensor, a switch sensor, a position sensor, and a valve sensor;(ii) establishing a target set point for a percent loss of weight from a particulate feed rate to determine the energy required for a desired water removal rate; and(iii) analyzing a ratio of energy available and energy needed and adjusting an inlet fluid temperature target set point of the fluid entering the dryer to achieve a desired water removal rate based on the analyzed ratio; and(c) substantially continuously feeding moisture-reduced particulate material out of the dryer apparatus. 2. The method of claim 1, wherein the step of determining an amount of energy available to evaporate moisture comprises the steps of: (a) adding a flow rate of the air at a first stage of the dryer apparatus with a flow rate of the air at a second stage of the dryer and a flow rate of the air in a duct entering the dryer, multiplying it by a difference between an air temperature entering the dryer and an air temperature leaving dryer, all of which is multiplied by 0.242 to obtain a result,(b) multiplying the result by a sum of an air flow rate in a first scrubber box and an air flow rate in a second scrubber box and an air flow rate in a vent box, all of which is multiplied by a difference between a temperature of a fluid entering scrubber boxes and a temperature of the fluid leaving dryer, all of which is multiplied by 0.242 to obtain an amended result,(c) adding the amended result to a product of a water flow rate between pumps and dryer and a difference between a water temperature leaving the dryer and a water temperature entering the dryer, all of which is multiplied by 1.0. 3. The method of claim 1, wherein the step of determining an amount of energy available to evaporate moisture comprises the steps of: (a) determining a flow rate of air entering a mixing box, multiplying the flow rate of air entering the mixing box by a hot air temperature leaving the dryer and multiplying it by 0.242 to obtain a result,(b) adding the result to a product of cold air flowing into the mixing box and a difference between a cold air temperature for the dryer and an air temperature leaving the dryer, all of which is multiplied by 0.242 to obtain an amended result,(c) adding the amended result to a product of a water flow rate between pumps and the dryer, which is multiplied to a difference between water temperature entering the dryer and water temperature leaving the dryer. 4. The method of claim 1, wherein the step of determining an amount of energy available to evaporate moisture comprises the steps of determining a flow rate of air entering a mixing box, and multiplying a specific humidity of air leaving a dust collector by the sum of the flow rate of air entering a mixing box and a temperature of cold air entering the mixing box. 5. A method of controlling the operation of a low-temperature, open-air process for heat treating a feed, by-product, or product stream within a plant operation that produces at least two different types of waste heat, wherein such process incorporates a source of feed, by-product, or product stream, a heat treatment apparatus, a first heat exchanger operatively connected to the heat treatment apparatus, and a first waste heat source provided to the first heat exchanger for delivering heat content contained within the first waste heat source to the heat treatment apparatus, a second heat exchanger operatively connected to the heat treatment apparatus, a second waste heat source different in type from the first waste heat source provided to the second heat exchanger for delivering heat content contained within the second waste heat source to the heat treatment apparatus, such method comprising operating computing apparatus to automatically perform the steps of (a) regulating delivery of the feed, by-product, or product stream to the heat treatment apparatus;(b) regulating the delivery of the first waste heat source to the first heat exchanger;(c) regulating the delivery of the second waste heat source different in type from the first waste heat source to the second heat exchanger;(d) actively combining predetermined amounts of heat content contained within the first waste heat source and second waste heat source to deliver an aggregate heat content to or within the heat treatment apparatus;(e) maintaining the feed, by-product, or product stream within the heat treatment apparatus exposed to the aggregate heat content for a sufficient temperature and time duration to achieve the desired degree of moisture reduction to achieve the desired degree of heat treatment; and(f) delivery of the heated feed, by-product, or product stream discharged from the heat treatment apparatus to a desired destination;(g) wherein “waste heat source” means a gaseous or liquid stream having an elevated heat content resulting from operation of a process or piece of equipment used within an industrial plant operation different from the heat treatment apparatus, such gaseous or liquid stream being used for the secondary purpose of providing heat content to the heat treatment process. 6. The controller method of claim 5, wherein the heat treatment apparatus is a fluidized-bed dryer. 7. The controller system of claim 5, wherein the heat treatment apparatus is a fixed-bed dryer. 8. The controller method of claim 5, wherein the feed, by-product, or product stream is coal. 9. The controller method of claim 5, wherein the waste heat sources are selected from the group consisting of cooling water streams, hot condenser cooling water, hot flue or stack gas, waste process steam, and discarded heat from operating equipment. 10. The controller method of claim 5, Wherein the predetermined temperature delivered to the heat treatment apparatus by the heat source does not exceed 300° F. 11. The controller method of claim 5, wherein the predetermined temperature delivered to the heat treatment apparatus by the combined first and second waste heat sources is about 200-300° F. 12. The controller method of claim 5 further comprising regulating the delivery of at least one additional waste heat source to the heat treatment apparatus by means of an associated heat exchanger to which was provided an additional type of waste heat, wherein “waste heat source” means a gaseous or liquid stream having an elevated heat content resulting from an operation of a process or piece of equipment used within an industrial plant operation different from the heat treatment apparatus, such gaseous or liquid stream being used for the secondary purpose of providing heat content to the heat treatment process. 13. The controller method of claim 5 further comprising regulating the delivery of at least one additional heat source to the heat treatment apparatus by means of an associated heat exchanger to which was provided a principal heat source, wherein “principal heat source” means a quantity of heat produced for the principal purpose of providing heat content to the heat treatment apparatus. 14. The controller method of claim 5, wherein the low-temperature, open-air, heat treatment process is used as part of a manufacturing operation. 15. The controller method of claim 14, wherein the manufacturing operation is an electric power plant. 16. The controller method of claim 5, wherein such low-temperature, open-air, heat treatment process further comprises: (a) a fluidizing bed contained within the heat treatment apparatus for receiving a fluidizing stream to achieve repartition of fluidized particles and non-fluidized particles within the feed, by-product, or product stream contained within the fluidized bed;(b) a source of fluidizing stream operatively connected to the heat treatment apparatus;(c) a conveyor means for transporting the non-fluidized particles inside the fluidized bed to the exterior of the heat treatment apparatus separate from the heat-treated particulate material discharged therefrom;(d) means for regulating the operative connection of the fluidizing stream to the heat treatment apparatus; and(e) means for regulating the operation of the conveyor means. 17. The controller method of claim 16, wherein the conveyor means is a screw auger. 18. The controller method of claim 16, wherein the fluidizing stream is air. 19. The controller method of claim 16, Wherein the fluidizing stream is an inert gas. 20. The controller method of claim 16, wherein the fluidizing stream is heated by one of the waste heat sources prior to operative communication to the heat treatment apparatus. 21. The controller method of claim 16, wherein the non-fluidized particles removed by the conveying means from the heat treatment apparatus enhance the flow of the feed, by-product, or product stream through the heat treatment apparatus to the heat-treated particulate material delivery means. 22. The controller method of claim 16, wherein the non-fluidized particles removed from the fluidized dryer separately from the dried particulate material discharge stream contain an increased weight percentage of at least one contaminant contained within the wet particulate material feed relative to the weight percentage of that contaminant within the wet particulate material feed. 23. A method of controlling the operation of a low-temperature, open-air process for thermally amplifying a gaseous stream for use in association with a heat treatment apparatus contained within a manufacturing operation that produces at least one waste heat source, wherein such process incorporates a gaseous stream and at least one waste heat source, such controller method comprising operating computing apparatus to automatically perform the steps of: (a) regulating delivery of the gaseous stream at a first temperature;(b) regulating the delivery of the waste heat source to a first heat exchanger whereby heat content contained within the waste heat source is delivered via the first heat exchanger to the gaseous stream which exits the first heat exchanger at a second temperature that is higher than the first temperature;(c) regulating the delivery of a waste heat source to a second heat exchanger whereby heat content contained within the waste heat source is delivered via the second heat exchanger to the gaseous stream which exits the second heat exchanger at a third temperature that is higher than the second temperature;(d) regulating delivery of the gaseous stream heated in series via the first heat exchanger and second heat exchanger to the heat treatment apparatus; and(e) wherein “waste heat source” means a gaseous or liquid stream having an elevated heat content resulting from operation of a process or piece of equipment used within an industrial plant operation different from the dryer apparatus, such gaseous or liquid stream being used for the secondary purpose of providing heat content to the particulate material moisture reduction process. 24. The controller method of claim 23, wherein the waste heat source delivered to the first heat exchanger and the second heat exchanger constitute the same waste heat source within the manufacturing operation. 25. The controller method of claim 23, wherein the waste heat sources delivered to the first heat exchanger and the second heat exchanger constitute different types of waste heat sources within the manufacturing operation. 26. The controller method of claim 23, wherein the waste heat sources are selected from the group consisting of hot condenser cooling water, hot stack gas, hot flue gas, spent process steam, and discarded heat from operating equipment. 27. The controller method of claim 23 further comprising the providing of at least one additional heat exchanger and associated source of heat, whereby the gaseous stream exits the additional heat exchanger at a temperature higher than the temperature at which it exited the previous heat exchanger. 28. The controller method of claim 23, wherein the manufacturing operation is an electrical power plant. 29. A method of controlling the operation of a coal drying system incorporated into an industrial plant operation having at least two different types of waste heat, wherein such process incorporates a source of wet coal particulate material, a fluidized bed dryer, a fluidizing air stream, an air preheater for heating the fluidizing air stream before it enters the fluidized bed dryer, a heat exchanger embedded inside the fluidized bed dryer, a first waste heat source, and a second waste heat source different in type from the first waste heat source, such controller method comprising operating computing apparatus to automatically perform the steps of: (a) regulating delivery of the coal particles to the fluidized bed dryer;(b) regulating delivery of the air stream to the fluidized bed dryer to fluidize the coal particles within the dryer unit;(c) regulating the delivery of the first waste heat source to the air preheater whereby heat content contained within the first waste heat source is delivered to the air preheater;(d) regulating the delivery of the second waste heat source different in type from the first waste heat source to the air preheater whereby heat content contained within the second waste heat source is delivered to the air preheater;(e) maintaining the fluidizing air stream within the air preheater for a sufficient time to elevate it to a desired temperature before the fluidizing air stream is delivered to the fluidized bed dryer;(f) regulating the delivery of at least one of the waste heat sources to the heat exchanger embedded inside the fluidized bed dryer for increasing the interior temperature of the dryer unit;(g) maintaining the coal particles within the dryer unit exposed to a combination of the heat content contained within fluidizing air stream and provided by the embedded heat exchanger for a sufficient temperature and time duration to achieve the desired degree of moisture reduction to the coal particles;(h) regulating delivery of the moisture-reduced coal particles discharged from the fluidized bed dryer to a moisture-reduced coal particles discharge destination; and(i) wherein “waste heat source” means a gaseous or liquid stream having an elevated heat content resulting from operation of a process or piece of equipment used within an industrial plant operation different from the dryer apparatus, such gaseous or liquid stream being used for the secondary purpose of providing heat content to the particulate material moisture reduction process. 30. The controller method of claim 29, wherein the two different types of waste heat sources constitute hot condenser cooling water and hot flue gas produced within the industrial plant operation. 31. The controller method of claim 5, wherein the active combining of the first waste heat source and the second waste heat source occurs inside a mixing box positioned outside the dryer apparatus. 32. The controller method of claim 5, wherein the active combining of the first waste heat source and the second waste heat source occurs within two heat exchangers positioned in series outside the dryer apparatus. 33. The controller method of claim 5, Wherein the active combining of the first waste heat source and the second waste heat source occurs within a common heat exchanger positioned inside the dryer apparatus. 34. The controller method of claim 33, wherein the active combining of the first waste heat source and the second waste heat source occurs inside a mixing box positioned outside the heat apparatus. 35. The controller method of claim 33, wherein the active combining of the first waste heat source and the second waste heat source occurs within two heat exchangers positioned in series outside the heat apparatus. 36. The controller method of claim 33, wherein the active combining of the first waste heat source and the second waste heat source occurs within a common heat exchanger positioned inside the heat apparatus.
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