RU2018104542A - Device and method for determining the supply of twin-screw displacement pumps - Google Patents

Claims (119)

1. A device comprising signal processor configured for receiving an alarm containing information about the actual pump characteristics data for the actual nominal conditions recorded during the tuning function associated with the operation of the twin-screw displacement pump; and determining the corrected pump characteristic data for operating the twin-screw displacement pump by correcting the pump characteristic data used for operating the twin-screw displacement pump based, at least in part, on the actual pump characteristics for the actual nominal conditions recorded during the setting function. 2. The device according to claim 1, in which the adjusted pump performance data includes updated published pump performance data containing the published rated power and rated internal leakage rate, adjusted for actual nominal conditions. 3. The device according to claim 1, in which the data of the actual characteristics of the pump include information about the actual speed, actual power, actual specific gravity and actual viscosity associated with the operation of the twin-screw displacement pump. 4. The device according to claim 3, in which the adjusted data of the characteristics of the pump include adjusted published data of the characteristics of the pump containing adjusted for the actual nominal conditions published rated power and nominal coefficient of internal leakage. 5. The device according to claim 1, in which the signal processor is configured to determine the nominal flow rate for a twin-screw displacement pump based on published pump characteristics that are not adjusted. 6. The device according to p. 5, in which the signal processor is configured to provide a control signal containing information about the actual value of the feed, to control the operation of a twin-screw displacement pump. 7. The device according to claim 2, wherein the signal processor is configured to determine the adjusted published rated power by correcting the published rated power based at least in part on the actual power, specific gravity and viscosity under actual nominal conditions. 8. The device according to claim 1, in which the signal processor comprises or is a controller or controller module configured to control the operation of a twin-screw positive displacement pump. 9. The device of claim 7, wherein the signal processor is configured to determine a nominal internal leakage rate adjusted for actual nominal conditions based at least in part on the nominal feed and the adjusted nominal torque. 10. The device according to claim 9, in which the signal processor is configured to run the function of setting and replacing the published values of the rated power and the nominal coefficient of internal leaks adjusted for the actual nominal conditions of the nominal power and nominal coefficient of internal leaks. 11. The device according to p. 10, in which the signal processor is configured to determine the actual value of the feed based on at least partially subtracting the adjusted nominal flow of internal leaks from the theoretical feed. 12. The device according to claim 10, in which the signal processor is configured to use the corrected for the actual nominal conditions of the rated power and the nominal coefficient of internal leakage until another setting function is started. 13. The device according to claim 1, in which the alarm contains information about the parameters of the pump, including some combination of pump type, nominal flow rate, published rated speed, published rated power, published design viscosity, published nominal specific gravity and flow in the absence of internal leaks, as well as information about the actual speed and power from a variable frequency drive (VFD) together with the actual specific gravity and viscosity data; and a signal processor is configured to determine a corrected flow or internal leakage rate based at least in part on this signaling. 14. The apparatus of claim 13, wherein the signal processor is configured to determine an actual feed value based at least in part on subtracting the adjusted nominal flow or internal leakage coefficient from the theoretical feed or coefficient. 15. The apparatus of claim 14, wherein the signal processor is configured to determine a corrected nominal flow or internal leakage coefficient without using sensors based at least in part on a constant temperature application where the specific gravity and viscosity are substantially constant. 16. The device according to p. 14, in which, in variable temperature applications, the signal processor is configured to receive temperature measurement results and determine the adjusted nominal internal leakage coefficient by correcting for changing conditions, including actual speed, specific gravity and viscosity, based on, at least partially the same. 17. The device according to claim 2, in which the signal processor is configured to determine the adjusted published rated power based at least in part on the following equation: RTD HP _CORR = HP _ACT × (SG _RTD / SG _ACT ) / (VISC _ACT / VISC _RTD ) ^N , where RTD HP _CORR is the adjusted published rated power in the form of a rated value (hp), adjusted for specific gravity and viscosity, HP _ACT - actual power under rated conditions, SG _RTD - nominal specific gravity of the pumped liquid, SG _ACT - actual specific gravity of the pumped liquid, VISC _RTD - nominal viscosity of the pumped liquid, VISC _ACT - Actual fluid viscosity and N is an indicator that depends on the type of pump. 18. The device according to p. 17, in which N is approximately 0.275 for twin-screw displacement pumps. 19. The device according to p. 17, which contains a twin-screw displacement pump. 20. The device according to p. 18, in which the signal processor is configured to determine the nominal coefficient of internal leaks, adjusted for the actual nominal conditions based on at least partially the following equation: KS = (VISC _RTD × Q _{NO SLIP} × (Q _{NO SLIP} -Q _RATED ) / (75,415 × K _G × (N _RATED ) × T _{RTD CORR} ), where KS is the nominal internal leakage rate, adjusted for actual nominal conditions, VISC _RTD - published nominal viscosity for the pump, Q _{NO SLIP} — feed in gallons per minute at rated speed and nominal viscosity at a differential pressure of 0 psi. inch (psid) K _G = 0.004329 - calculated constant, N _RATED is the rated speed of the pump for use and T _{RTD CORR} is the adjusted nominal torque in pound-force feet, which is defined as follows: T _{RTD CORR} = (5252 × RTD HP _CORR ) / N _RTD . 21. The device according to p. 20, in which the signal processor is configured to determine the actual flow rate for a twin-screw displacement pump based at least in part on the following equation: Q _{ACT CORR} = (Q _{NO SLIP} × ((N _MOTOR / RATIO) / N _RATED )) - (((75,415 × K _G × KS _CORR ) × (N _MOTOR / RATIO) × T _{ACT CORR} ) / (VISCOSITY _ACT × Q _{NO SLIP} ), where Q _{NO SLIP} is the feed in gallons per minute (gpm) at rated speed and nominal viscosity at a differential pressure of 0 psi. inch (psid) N _MOTOR - current engine speed, RATIO - speed reduction factor if a gearbox is used; if the gearbox is not used, then the value of RATIO = 1,0, N _RATED - rated pump speed for use, K _G = 0.004329, calculated constant, KS _CORR - adjusted nominal internal leakage rate based on internal leakage rules for operating conditions and a specific type of rotary displacement pump, T _{ACT CORR} is the torque in pound-force feet, where T _{ACT CORR} = (5252 × HP _{ACT CORR} ) / N _ACT and HP _{ACT CORR} = HP _ACT × (SG _RTD / SG _ACT ), HP _ACT - actual engine power, N _ACT is the actual speed of the pump and VISC _ACT is the actual viscosity of the fluid handled. 22. A method comprising receiving by the processor an alarm containing information about the data of the actual characteristics of the pump for the actual nominal conditions recorded during the tuning function associated with the operation of the twin-screw displacement pump; and determining, by means of a signal processor, the adjusted data of the published pump characteristics for operating the twin-screw displacement pump by correcting the data of published pump characteristics used for operating the twin-screw displacement pump based, at least in part, on the actual pump characteristics for the actual nominal conditions recorded in setting function time. 23. The method according to p. 22, in which the adjusted data of the characteristics of the pump include adjusted published data of the characteristics of the pump containing adjusted for the actual nominal conditions published rated power and nominal coefficient of internal leakage. 24. The method according to p. 22, in which the data of the actual characteristics of the pump contain information about the actual speed, actual power, actual specific gravity and actual viscosity associated with the operation of the twin-screw displacement pump. 25. The method of claim 24, wherein the adjusted pump performance data includes updated published pump performance data having published rated power and rated internal leakage rate adjusted for actual nominal conditions. 26. The method according to p. 22, which includes the use of the nominal flow rate for a twin-screw displacement pump based on the published characteristics of the pump. 27. The method according to p. 26, which includes providing the signal processor with a control signal containing information about the actual value of the feed, for controlling the operation of a twin-screw displacement pump. 28. The method according to claim 23, which comprises determining, by the signal processor, the corrected published rated power by correcting the published rated power based, at least in part, on the actual power, specific gravity and viscosity under actual nominal conditions. 29. The method according to p. 28, which includes controlling the operation of a twin-screw positive displacement pump controller or controller module having a signal processor. 30. The method according to p. 28, which includes the determination by the signal processor of the nominal coefficient of internal leaks, adjusted for the actual nominal conditions, based, at least in part, on the nominal supply and the adjusted nominal torque. 31. The method according to p. 30, including the launch of the signal processor tuning function, which replaces the rated power and the nominal coefficient of internal leaks adjusted for the actual nominal conditions of the nominal power and nominal coefficient of internal leaks. 32. The method according to p. 31, which includes determining, by the processor of the signals, the actual value of the feed based, at least in part, by subtracting the adjusted nominal flow of internal leaks from the theoretical feed. 33. The method according to p. 31, which includes the use of the adjusted rated power and the nominal coefficient of internal leaks until then, until you start another setting function. 34. The method according to p. 22, in which the alarm contains information about the parameters of the pump, including some combination of pump type, nominal flow rate, published rated speed, published rated power, published design viscosity, published nominal specific gravity and flow in the absence of internal leaks, as well as information about the actual speed and power from a variable frequency drive (VFD), together with the actual specific gravity and viscosity data; and the method includes determining, by the processor, the corrected flow signals or the internal leakage rate based, at least in part, on this signaling. 35. The method according to p. 34, which includes determining by the signal processor the actual value of the feed, based, at least in part, subtracting the adjusted nominal flow or coefficient from the theoretical feed or coefficient. 36. The method according to p. 35, which includes the processor determining the signals of the corrected nominal flow or the coefficient of internal leaks without using sensors based, at least in part, at a constant temperature, where the specific gravity and viscosity are essentially constant. 37. The method according to p. 35, which in variable temperature applications includes receiving a temperature measurement signal from the processor and determining the adjusted nominal flow or internal leakage coefficient by correcting for changing conditions, including the actual speed, specific gravity and viscosity, based on at least in part, of the same. 38. The method according to p. 23, which includes the processor determining the signals of the adjusted published rated power based at least in part on the following equation: RTD HP _CORR = HP _ACT × (SG _RTD / SG _ACT ) / (VISC _ACT / VISC _RTD ) ^N , where RTD HP _CORR is the adjusted published rated power as a nominal value (hp), adjusted for specific gravity and viscosity, HP _ACT - actual power under rated conditions, SG _RTD - nominal specific gravity of the pumped liquid, SG _ACT - actual specific gravity of the pumped liquid, VISC _RTD - nominal viscosity of the pumped liquid, VISC _ACT - Actual fluid viscosity and N is an indicator that depends on the type of pump. 39. The method of claim 38, wherein N is approximately 0.275 for twin screw pumps. 40. The method according to p. 38, which includes determining by the signal processor the nominal coefficient of internal leaks, adjusted for the actual nominal conditions, based, at least in part, on the following equation: KS = (VISC _RTD × Q _{NO SLIP} × (Q _{NO SLIP} -Q _RATED ) / (75,415 × K _G × (N _RATED ) × T _{RTD CORR} ), where KS is the nominal internal leakage rate, adjusted for actual nominal conditions, VISC _RTD - published nominal viscosity for the pump, Q _{NO SLIP} — feed in gallons per minute at rated speed and nominal viscosity at a differential pressure of 0 psi. inch (psid) K _G = 0.004329 - calculated constant, N _RATED is the rated speed of the pump for use and T _{RTD CORR} is the adjusted nominal torque in pound-force feet, which is defined as follows: T _{RTD CORR} = (5252 × RTD HP _CORR ) / N _RTD . 41. The method according to p. 40, which includes determining by the signal processor the actual flow value for a twin-screw displacement pump based, at least in part, on the following equation: Q _{ACT CORR} = (Q _{NO SLIP} × ((N _MOTOR / RATIO) / N _RATED )) - (((75,415 × K _G × KS _CORR ) × (N _MOTOR / RATIO) × T _{ACT CORR} ) / (VISCOSITY _ACT × Q _{NO SLIP} ), where Q _{NO SLIP} is the feed in gallons per minute (gpm) at rated speed and nominal viscosity at a differential pressure of 0 psi. inch (psid) N _MOTOR - current engine speed, RATIO - speed reduction factor if a gearbox is used; if the gearbox is not used, then the value of RATIO = 1,0, N _RATED - rated pump speed for use, K _G = 0.004329, calculated constant, KS _CORR - adjusted nominal internal leakage rate based on internal leakage rules for operating conditions and a specific type of twin-screw positive displacement pump, T _{ACT CORR} is the torque in pound-force feet, where T _{ACT CORR} = (5252 × HP _{ACT CORR} ) / N _ACT and HP _{ACT CORR} = HP _ACT × (SG _RTD / SG _ACT ), HP _ACT - actual engine power, N _ACT is the actual speed of the pump and VISC _ACT is the actual viscosity of the fluid handled. 42. A device containing means for receiving an alarm containing information about the actual pump characteristics data for the actual nominal conditions recorded during the tuning function related to the operation of the twin-screw displacement pump; and means for determining the corrected pump characteristic data for operating the twin-screw displacement pump by correcting the pump characteristic data used for operating the twin-screw displacement pump based, at least in part, on the actual pump characteristics for the actual nominal conditions obtained during the setting function. 43. The device according to p. 42, in which the updated published data of the characteristics of the pump include adjusted published data of the characteristics of the pump containing adjusted for the actual nominal conditions published rated power and coefficient of internal leakage. 44. The device according to p. 42, in which the data of the actual characteristics of the pump contain information about the actual speed, actual power, specific gravity and viscosity associated with the operation of the twin-screw displacement pump, and received from the pump controller or control device, including a variable frequency drive . 45. The device according to p. 21, in which the signal processor is configured to determine the internal leakage rules for twin-screw positive displacement pumps based at least in part on the table IB below:

46. The device according to p. 45, in which the signal processor is configured to determine the result of the calculation of the feed as follows: Q _{ACT CORR} = Q _ACT and Q _{ACT CORR is} displayed as actual feed (Q _ACT ) in gallons per minute. 47. The device according to p. 46, in which the signal processor is configured to determine the parameters for the actual and nominal speed of the pump as follows: N _ACT is the actual speed of the pump and N _RTD is the rated speed of the pump for this application. 48. The method according to p. 41, which includes determining the rules of internal leaks for twin-screw displacement pumps based, at least in part, on the table below. IB:

49. The method according to p. 48, which includes determining the result of the calculation of the feed as follows: Q _{ACT CORR} = Q _ACT and Q _{ACT CORR is} displayed as actual feed (Q _ACT ) in gallons per minute. 50. The method according to p. 49, which includes determining the parameters for the actual and nominal speed of the pump as follows: N _ACT is the actual speed of the pump and N _RTD is the rated speed of the pump for this application.