Patent KR-20130075044-A (KR)
Title: Safety control method using difference to air-pressure and gas-pressure
Inventor: LEE SANG HEE
IPC: F23N5/00
Filed: 2011-12-27
Abstract: PURPOSE: A safety control method using the difference between the pneumatic pressure and gas pressure of boiler are provided to detect the differential pressure between gas pressure and pneumatic pressure, which are supplied to the combustion part of gas boiler, thereby displaying error in a case that the differential pressure, which is caused according to the machinery defect as well as the coil disconnection and the short of proportion electronic valve, deviates from the tolerance range. CONSTITUTION: A safety control method using the difference between the pneumatic pressure and the gas pressure of boiler comprises the following steps. If the determined time by a timer elapses during the combustion of boiler, the differential pressure between the current pneumatic pressure and the gas pressure is calculated and stored (S5). If compensation function exists, determining whether the differential pressure, which is stored by the calculation, is smaller than a minimum differential pressure for starting compensation which is memorized in a control unit in advance (S7). If the differential pressure, which is stored by the calculation, is smaller than the minimum differential pressure for starting compensation, which is memorized in a control unit in advanced, determining whether the differential pressure, which is stored by the calculation, is smaller than the minimum differential pressure for starting compensation which is memorized in a control unit in advance (S8). If the differential pressure, which is stored by the calculation, is smaller than the minimum differential pressure for starting compensation, which is memorized in a control unit in advanced, determining whether a random variable, which is computed with the time after the minimum compensation termination of ventilation fan, is greater than the minimum number of ventilation fan compensation termination (S9). If a random variable, which is computed with the time after the minimum compensation termination of ventilation fan, alarming that the error is generated in the proportion electronic valve or the ventilation fan (S10). [Reference numerals] (AA) Start; (S10) Error occurrence; (S11) DPr < standard minimum differential pressure; (S12) B > detection numbers below standard minimum differential pressure; (S15) FAN rotation numbers > maximum correction rotation numbers; (S16) A = 0 FAN rotation number direction value = FAN rotation number direction value + J; (S19) DPr > correction start maximum differential pressure?; (S2) Boiler combustion?; (S20) DPr > correction end maximum differential pressure?; (S21) C > FAN correction end maximum number; (S22) DPr > standard maximum differential pressure; (S23) D > detection numbers over standard minimum differential pressure; (S26) FAN rotation number < minimum correction rotation number; (S27) C = 0 FAN rotation number direction value = FAN rotation number direction value - K; (S3) Start timer T counting; (S4) End timer T?; (S5) Fix differential pressure between gas pressure and air pressure (DPr); (S6) Is there correction function?; (S7) DPr < correction start minimum differential pressure?; (S8) DPr < correction end minimum differential pressure; (S9) A > FAN correction end minimum number