System and method for measuring pressure and flow in a loop reactor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-002/12
B01J-019/18
G01F-001/38
G01L-015/00
출원번호
US-0198658
(2008-08-26)
등록번호
US-8202949
(2012-06-19)
발명자
/ 주소
McElvain, Robert R.
Hottovy, John D.
Ezell, Larry W.
Gupta, Anurag
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Fletcher Yoder P.C.
인용정보
피인용 횟수 :
2인용 특허 :
4
초록▼
A system and method for measuring pressure and flow rate of polymer slurry circulating in a loop reactor. For flow rate measurement, the loop reactor has a pressure tap on an outside radius of an elbow of the loop and a pressure tap on an inside radius of the elbow. The pressure taps incorporate dia
A system and method for measuring pressure and flow rate of polymer slurry circulating in a loop reactor. For flow rate measurement, the loop reactor has a pressure tap on an outside radius of an elbow of the loop and a pressure tap on an inside radius of the elbow. The pressure taps incorporate diaphragms. Sensing legs couple the pressure taps with a differential pressure meter configured to provide a signal indicative of the flow rate of the polymer slurry. For pressure measurement, pressure taps without diaphragms at the loop reactor wall may be disposed at various points along the loop reactor, the pressure taps coupled to pressure sensing lines. A diluent flush line having a screen disposed therein may provide diluent to the pressure taps. The screen may reduce fouling of the pressure tap and sensing line with solids from the reactor.
대표청구항▼
1. A loop reactor comprising: a first tap on an outside radius of an elbow of the loop reactor, the first tap comprising a first diaphragm;a second tap on an inside radius of the elbow, the second tap comprising a second diaphragm;a first sensing leg coupling the first tap to a differential pressure
1. A loop reactor comprising: a first tap on an outside radius of an elbow of the loop reactor, the first tap comprising a first diaphragm;a second tap on an inside radius of the elbow, the second tap comprising a second diaphragm;a first sensing leg coupling the first tap to a differential pressure meter; anda second sensing leg coupling the second tap to the differential pressure meter. 2. The loop reactor as recited in claim 1, wherein the first diaphragm is disposed at a wall of the elbow at the first pressure tap and the second diaphragm is disposed at the wall of the elbow at the second tap. 3. The loop reactor as recited in claim 1, wherein the elbow, the first and second taps, and the differential pressure meter comprise an elbow flow meter configured to indicate a flow rate of polymer slurry circulating in the loop reactor, the polymer slurry comprising polyolefin particles in a liquid. 4. The loop reactor as recited in claim 1, wherein the first tap is a high pressure tap and the second tap is a low pressure tap. 5. The loop reactor as recited in claim 1, wherein the first sensing leg is substantially hydraulically full with a first fluid and the second sensing leg is substantially hydraulically full with a second fluid. 6. The loop reactor as recited in claim 5, wherein the first fluid is in communication with a first sensing device in the differential pressure meter and the second fluid is in communication with a second sensing device in the differential pressure meter. 7. The loop reactor as recited in claim 6, wherein the first sensing device and second sensing device are sensing diaphragms. 8. The loop reactor as recited in claim 5, wherein the first fluid and the second fluid comprise oil. 9. The loop reactor as recited in claim 1, wherein the differential pressure meter comprises a transmitter configured to transmit a signal indicative of a pressure difference between the first tap and the second tap. 10. The loop reactor as recited in claim 9, comprising a processor configured to receive the signal and to calculate a flow rate of polymer slurry circulating in the loop reactor, the flow rate correlative to the indicated pressure difference, a density of the polymer slurry, and a cross-sectional area of a flow path in the elbow. 11. The loop reactor as recited in claim 1, wherein the first tap and the second tap are not flushed with a fluid. 12. A method of measuring flow rate of polymer slurry circulating in a loop reactor, comprising: measuring a first pressure in the loop reactor via a first diaphragm disposed in a first pressure tap at an outside radius of an elbow of the loop reactor, wherein the first diaphragm is in communication with a first sensing device in a differential pressure meter;measuring a second pressure in the loop reactor via a second diaphragm disposed in a second pressure tap at an inside radius of the elbow, the second diaphragm in communication with a second sensing device in the differential pressure meter; andindicating the flow rate of the polymer slurry based on the first pressure and second pressure. 13. The method as recited in claim 12, wherein the first sensing device and second sensing device are sensing diaphragms. 14. The method as recited in claim 12, wherein the polymer slurry comprises polyolefin polymer in a liquid. 15. A method of retrofitting an elbow flow meter of a loop reactor, comprising: installing a first diaphragm substantially even with a wall of the loop reactor at a high pressure tap of the elbow flow meter; andinstalling a second diaphragm substantially even with the wall of the loop reactor at a low pressure tap of the elbow flow meter. 16. The method as recited in claim 15, comprising decommissioning diluent flushes of the high pressure tap and the low pressure tap. 17. The method as recited in claim 15, comprising: filling a high-pressure sensing leg between the first diaphragm and a differential pressure meter of the elbow flow meter with a sensing fluid andfilling a low-pressure sensing leg between the second diaphragm and the differential flow meter with the sensing fluid. 18. A process for manufacturing a product comprising a polyolefin, the process comprising: manufacturing a product at least a portion of which comprises a polyolefin, wherein the polyolefin is produced by a method comprising: polymerizing olefin monomer in the presence of catalyst in a loop reactor to form the polyolefin;measuring a first pressure in the loop reactor via a first diaphragm disposed in a first pressure tap at an outside radius of an elbow of the loop reactor, wherein the first diaphragm is in communication with a first sensing device in a differential pressure meter;measuring a second pressure in the loop reactor via a second diaphragm disposed in a second pressure tap at an inside radius of the elbow, the second diaphragm in communication with a second sensing device in the differential pressure meter; andindicating the flow rate of a slurry of the polyolefin circulating in the loop reactor based on the first pressure and second pressure. 19. The process as recited in claim 18, wherein manufacturing comprises processing the polyolefin to form the product or to form a polyolefin component of the product. 20. The process as recited in claim 19, wherein processing comprises blending, heating, melting, compounding, extruding, injection molding, precision molding, blow molding, forming a film, forming a coating, or incorporating an additive, or any combination thereof. 21. A loop reactor comprising: a pressure tap on a pipe segment of the loop reactor;a pressure sensing device fluidically coupled with the pressure tap via a sensing line and configured to indicate pressure in the loop reactor;a diluent flush line fluidically coupled with the pressure tap; anda screen disposed in the diluent flush line. 22. The loop reactor as recited in claim 21, wherein the screen comprises a wire mesh screen. 23. The loop reactor as recited in claim 21, wherein the diluent flush line is fluidically coupled to the pressure tap via the sensing line. 24. The loop reactor as recited in claim 21, wherein the screen is configured to increase velocity of diluent flowing in the diluent flush line and to reduce backflow of solid particles from the loop reactor to the pressure tap and flush line. 25. The loop reactor as recited in claim 21, wherein the pressure sensing device comprises a pressure transmitter comprising a diaphragm.
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이 특허에 인용된 특허 (4)
Funk Gregory A. (Carol Stream IL) Hobbs Simon H. (Chicago IL) Oroskar Anil R. (Downers Grove IL) Gembicki Stanley A. (Clarendon Hills IL) Kocal Joseph A. (Gurnee IL), Cocurrent simulated moving bed hydrocarbon alkylation process.
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