CN103470488B - The determination methods of warming-up amount - Google Patents

Abstract

The determination methods of warming-up amount is a kind of judgment technology of warming-up amount, it solve the improper huge waste brought of warming-up, by the correct judgement to warming-up line, we can find the most economical aperture of stand by pump warming-up line, or realize most economical warming-up amount by technical innovation; To the high-temp liquid pump assembly of industrial extensive use, there is good energy-saving effect; In addition, measured value is fitted to curve, and the method directly effectively can be applied in the control system of independently controller or production unit by the way that dress changes slope into, is easy to achievements conversion.

Description

The determination methods of warming-up amount

Technical field: the judgment technology that the present invention relates to a kind of warming-up amount, the especially determination methods of warming-up amount.

Background technique: along with the increase of domestic unit capacity, boiler feed water pump startup advance row warming-up has become one of most important start-up routine.If this is because before starting warming-up insufficient, after starting, feed water pump will be subject to the direct thermal shock of high-temperature water, cause heat expansion uneven, the upper and lower temperature difference of the aggravation pump housing, and the pump housing is produced, and hogback is out of shape, leaks, the sound part wears even accident such as seize in pump.Therefore no matter boiler feed pump is in cold conditions or hot lower startup, all must carry out warming-up before activation.

For desalination water pump initiating switchup, during driving, the warming-up time is relatively crucial economic indicator; Having little significance of warming-up amount practical operation, does not do to consider usually.But the warming-up amount for stand by pump is a parameter considered for a long time.Warming-up line is always in running order between stand by pump standby period, the consumption of warming-up amount be material and the energy consumption of working pump.The flow reducing stand by pump warming-up line be as far as possible we under long-time running state, control one of energy-saving and cost-reducing index.

Summary of the invention: the object of the present invention is to provide a kind of easy to operate and effectively can reduce the determination methods of warming-up amount that stand by pump warming-up consumes, it solve the improper huge waste brought of warming-up.The object of the present invention is achieved like this: at stand by pump running-in period, first the system of coordinates of warming-up line aperture and pump body temperature relation is drawn, distinguish measures ambient temperature T0 again, high temperature media temperature T1, can pump body temperature T2:T2=T1-40 DEG C be calculated, require pump housing surface in this place basis HGJ207-83 " chemical machine installing engineering construction and acceptance specification " and have the temperature difference of the import process pipelines of working medium should be not more than 40 DEG C;

Thus determine linear equation m:T1=100 × KmX+T0; Km=(T1-T0) X/100 (0≤X≤100) can be obtained

With linear equation n:T2=100 × KnX+T0; Can obtain Kn=(T2-T0) X/100 (0≤X≤100), wherein, X represents warming-up line aperture, and Km, Kn are the slope of straight line m, n; Region between m, n is exactly the operation area that warming-up lineation is thought; Then under stand by pump dead status, the aperture of adjustment warming-up line; Make it respectively 10%, 20%, 30% ... run 3-5 hour for 100% time, measure the temperature T of the pump housing under different opening respectively, obtain the curve of a near linear according to T matching, corresponding formula is:

T=100 × KX+T0, its slope is: K=(T-T0) X/100;

Can judge thus:

If slope K >Km, warming-up line be designed with certain surplus, rational operation should be noted, it is serious that misoperation can make energy consumption waste, aperture is excessive, stand by pump impeller can be made time serious to reverse, damage equipment, now minimum warming-up line aperture X1 is: the intersection point of T=100 × KX+T0 and T=T2;

If slope K m >=K >=Kn, the design of warming-up line is rational, and now minimum warming-up line aperture X2 is:

The intersection point of T=100 × KX+T0 and T=T2;

If slope K n>K, the design discharge of warming-up line is too small, and stand by pump can not be made to be within safe temperature range, very harmful to equipment during startup, should carry out technological transformation in time.

Meaning of the present invention is: by the correct judgement to warming-up line, and we can find the most economical aperture of stand by pump warming-up line, or realizes most economical warming-up amount by technical innovation.To the high-temp liquid pump assembly of industrial extensive use, there is good energy-saving effect.In addition, measured value is fitted to curve, and the method directly effectively can be applied in the control system of independently controller or production unit by the way converting slope to, is easy to achievements conversion.

Accompanying drawing illustrates: Fig. 1 is the schematic diagram of warming-up amount determination methods.

Embodiment: at stand by pump running-in period, first the system of coordinates of warming-up line aperture and pump body temperature relation is drawn, distinguish measures ambient temperature T0 again, high temperature media temperature T1, can pump body temperature T2:T2=T1-40 DEG C be calculated, require pump housing surface in this place basis HGJ207-83 " chemical machine installing engineering construction and acceptance specification " and have the temperature difference of the import process pipelines of working medium should be not more than 40 DEG C;

Thus determine linear equation m:T1=100 × KmX+T0; Km=(T1-T0) X/100 (0≤X≤100) can be obtained

With linear equation n:T2=100 × KnX+T0; Can obtain Kn=(T2-T0) X/100 (0≤X≤100), wherein, X represents warming-up line aperture, and Km, Kn are the slope of straight line m, n; Region between m, n is exactly the operation area that warming-up lineation is thought; Then under stand by pump dead status, the aperture of adjustment warming-up line; Make it respectively 10%, 20%, 30% ... run 3-5 hour for 100% time, measure the temperature T of the pump housing under different opening respectively, obtain the curve of a near linear according to T matching, corresponding formula is:

T=100 × KX+T0, its slope is: K=(T-T0) X/100;

Can judge thus:

If slope K >Km, warming-up line be designed with certain surplus, rational operation should be noted, it is serious that misoperation can make energy consumption waste, aperture is excessive, stand by pump impeller can be made time serious to reverse, damage equipment, now minimum warming-up line aperture X1 is: the intersection point of T=100 × KX+T0 and T=T2;

If slope K m >=K >=Kn, the design of warming-up line is rational, and now minimum warming-up line aperture X2 is:

The intersection point of T=100 × KX+T0 and T=T2;

If slope K n>K, the design discharge of warming-up line is too small, and stand by pump can not be made to be within safe temperature range, very harmful to equipment during startup, should carry out technological transformation in time.

Claims (1)

1. the determination methods of warming-up amount, it is characterized in that: at stand by pump running-in period, first the system of coordinates of warming-up line aperture and pump body temperature relation is drawn, distinguish measures ambient temperature T0 again, high temperature media temperature T1, can pump body temperature T2:T2=T1-40 DEG C be calculated, require pump housing surface in this place basis HGJ207-83 " chemical machine installing engineering construction and acceptance specification " and have the temperature difference of the import process pipelines of working medium should be not more than 40 DEG C;

Thus determine linear equation m:T1=100 × KmX+T0; Km=(T1-T0) X/100 (0≤X≤100) can be obtained

With linear equation n:T2=100 × KnX+T0; Can obtain Kn=(T2-T0) X/100 (0≤X≤100), wherein, X represents warming-up line aperture, and Km, Kn are the slope of straight line m, n; Region between m, n is exactly the operation area that warming-up lineation is thought; Then under stand by pump dead status, the aperture of adjustment warming-up line; Make it respectively 10%, 20%, 30% ... run 3-5 hour for 100% time, measure the temperature T of the pump housing under different opening respectively, obtain the curve of a near linear according to T matching, corresponding formula is:

T=100 × KX+T0, its slope is: K=(T-T0) X/100;

Can judge thus:

If slope K >Km, warming-up line be designed with certain surplus, rational operation should be noted, it is serious that misoperation can make energy consumption waste, aperture is excessive, stand by pump impeller can be made time serious to reverse, damage equipment, now minimum warming-up line aperture X1 is: the intersection point of T=100 × KX+T0 and T=T2;

If slope K m >=K >=Kn, the design of warming-up line is rational, and now minimum warming-up line aperture X2 is:

The intersection point of T=100 × KX+T0 and T=T2;

If slope K n>K, the design discharge of warming-up line is too small, and stand by pump can not be made to be within safe temperature range, very harmful to equipment during startup, should carry out technological transformation in time.