Quarry Southern Africa November 2017 - Page 28

TECHNOLOGY Traditional burners applied to asphalt plants use the air from the environment (sucked in by an exhaust fan with constant turning speed) and a mechanical fan (called a blower) to provide the amount of air needed for combustion inside the dryer drum. turning speed) and a mechanical fan (called a blower) to provide the amount of air needed for combustion inside the dryer drum. The control over the airflow for combustion is carried out by a component that is called a damper, placed in the gases’ outlet to the environment, which controls the pressure of the plant by manipulating the flow of the gases. There is an optimum combustion ratio of 13 B\Y[[Y\وZ\܈ۙH[YHوY[ B[HZ\\X][ۈ\\[[ۈB][ۈوH[\\[HH^]\š\ۜ[ H]\X\[ۈXH[[˜X\][H[]]X]X[H۝B[][HZ\]YY[][ˈ[\XK[HX\[ۈZ\\YX[X[H\YYHH[ ]]Z\X[ۈHB[\ۛY[ HY[ H\[[^X[[K[Y8&[Z\&K]ܚ[BYH[[\[\\H[]قHY\[]]X]X\X][ۈوHZ\˜HH\X][ۈوH][ۘ[YYوB^]\\X[ܝH\\HBY\H[\[]\H][\K\^KۛHHZ\\Y܈X\[ۂ\X]Y \[[[Y[Xۛ^K[XXœ\\[]Y \H\\[[[KH^]\\\Xܙ[H[X[ ۝ݙ\Z^[[YB\[H\Yۈو[\[ۘܙ]BڙX[HXܘ]ܞKHZ^[[YB]Y[YܙY]\[[\\[ۂH\X\\XوHX]\X[ˈYB[\H\K\[HXܘ]ܞKHZ^[[YH[[\HXܙ[B\Y\وHX]\X[ˈ\YܙK[^\[YZ[Z^\\Y[][Y X]]X]X[H۝HZ^[[YBXܙ[H\]Z\[Y[وHX]\X[˜[\]\Z[YHH\]܈YܙH܂\[X[ۋHXH\\YۈH۝ݙ\HX]\X[]]\XH]Y[BZ^\[HY[]]܋[\]]\XH\YXY H[\\Y][HZ^\[ܙX\[HX]\X[[YB[HZ^[[YKY\[HX[ۂوH[ۜ[ YH]]\XH\›[H\[Z^X]\HZ^\[ܙBY[KXܙX\[H[YHوX]\X[[HZ^\[HZ^[[YK[H[XZ[Z[[ۜ[X[ۋ[H\ \[[YY\X]\X[[ڙX\X\\X]\XXHX]]K]\H]XY\X]]H\ۜ[ Y\\و[][ڙX[B]X[]H\XXYXܙ[H\[Y]\™\X\Y[HڙX X]H]]܂YܙY]\[[\Z^[[YHH\[[ \[H\Yۈو[\[ۘܙ]HڙX[HXܘ]ܞKHZ^[[YH]Y[YܙY]\[[\\[›ۈH\X\\XوHX]\X[˂UPTHHՑSPT M“X\[X\[\HX[\X][ۈ[[Y\]X\\]Z\[Y[ݚp\[H^[ B\YY[X\وH\[ܛ\]XX[\\[][[[X[YX\[\]Z\Y[܈Z[[XZ[Z[[[\Z\[Y