CN104005977B - The integral measuring method of general fan operation parameter - Google Patents

Abstract

The invention belongs to blower fan technical field, aim to provide a kind of integral measuring method of general fan operation parameter.The present invention includes three steps: measure temperature, the pressure signal of gas imported and exported by blower fan by temperature, pressure transducer, calculate fan outlet place gas flow Q, and measure blower fan and import and export profile cross-section and amass, in conjunction with the reading of ammeter.Beneficial effect of the present invention has: integral measuring method of the present invention only by pressure, temperature transducer gather blower fan import and export gas pressure and temperature data, and obtain fan inlet gas flow by calculated with mathematical model, the method fundamentally eliminates the way that tradition plug-in type flow measures compressor flow (flow velocity), engineering construction is easy, reliability is strong, and can realize real-time online measuring.

Description

The integral measuring method of general fan operation parameter

Technical field

The invention belongs to blower fan technical field, particularly a kind of integral measuring method of general fan operation parameter.

Background technique

According to statistics, in current China process industry, the electric energy of all kinds of fan operation consumption accounts for 1/3rd of whole nation generating total amount.The reason of a particular importance is, the unreasonable state causing most of blower fan reality all to operate in low load with strong power of design selection, in addition because of the change of the aspects such as production, technique, need the flow carrying out adjustments of gas through conventional air door, hydraulic couplers or valve, cause a large amount of power loss consumption on air door, hydraulic couplers or valve.Therefore, grasp fan operation parameter in real time, to the energy-saving and cost-reducing of blower fan system, there is very great meaning.

At present, the measurement of blower fan system all adopts pitot tube or other inserting-type flowmeters measurement gas flow velocity (flow) and measure the method that motor running parameter combines with ammeter in the import and outlet conduit section of blower fan usually, and this kind of metering system limit by blower fan system actual production technique.

First, on most of inserting-type flowmeter market, existing product is all the industrial air measurement sensor for the large discharge such as rock gas, steam, high flow rate, high pressure usually, structure bulky, generally be fixedly mounted on industrial pipeline, can not move easily, the usage requirement of the general blower fan of all kinds of process industry cannot be adapted to;

In addition, in process industry, the import and export pipeline of general blower fan system is all sealing usually, and air all has certain temperature and pressure usually in pipeline, the prerequisite of pitot tube or other inserting-type flowmeters is used to be must perforate on pipeline, realize all very complicated from Security or operability, therefore develop a kind of integral measuring method of general fan operation parameter, fundamentally can solve that conventional measuring methods is single, measuring phase is complicated and the problem such as measurement result is unreliable.

Summary of the invention

The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, provides a kind of integral measuring method of general fan operation parameter.

For technical solution problem, solution of the present invention is:

A kind of integral measuring method of general fan operation parameter is provided, comprises the steps:

Steps A: measure temperature, the pressure signal of gas imported and exported by blower fan by temperature, pressure transducer;

Step B: fan outlet place gas flow Q calculation procedure is as follows:

1) gas pressure at fan inlet place is divided into N number of sampled point p _in1, p _in2..., p _inN, its unit symbol is Pa; The gas pressure at fan outlet place is also divided into N number of sampled point p _out1, p _out2p _outN, its unit symbol is Pa; Under every bit measurement condition, measure after stable, during measuring, the method for operation remains unchanged, then fan inlet, outlet average gas pressure are respectively

$\stackrel{\‾}{p_{\mathrm{in}}}=\frac{p_{\mathrm{in}1}+p_{\mathrm{in}2}+......+p_{\mathrm{inN}}}{N},\stackrel{\‾}{p_{\mathrm{out}}}=\frac{p_{\mathrm{out}1}+p_{\mathrm{out}2}+......+p_{\mathrm{outN}}}{N},$ Unit symbol is Pa;

2) gas at fan inlet place is divided into M temperature sampling point t _in1, t _in2t _inM, unit symbol is DEG C; Under every bit measurement condition, measure after stable, during measuring, the method for operation remains unchanged, then fan inlet mean gas temperature is respectively

$\stackrel{\‾}{t_{\mathrm{in}}}=\frac{t_{\mathrm{in}1}+t_{\mathrm{in}2}+......+t_{\mathrm{inM}}}{M},$ Its unit symbol is DEG C;

3) blower fan import and export gas-static difference is

$p_k=\stackrel{\‾}{p_{\mathrm{out}}}-\stackrel{\‾}{p_{\mathrm{in}}},$ Unit symbol is Pa;

4) gas density at fan outlet place is

${\mathrm{\ρ}}_{\mathrm{out}}=\frac{p_{\mathrm{inab}}}{275.2\×(273+\stackrel{\‾}{t_{\mathrm{in}}})}=\frac{\stackrel{\‾}{p_{\mathrm{in}}}+p_o}{275.2\×(273+\stackrel{\‾}{t_{\mathrm{in}}})},$ Unit symbol is kg/m ³;

5) representation of fan outlet place gas flow Q:

$Q=k\·\sqrt{\frac{p_k}{{\mathrm{\ρ}}_{\mathrm{out}}}},$

Wherein, Q is fan outlet place gas flow, and unit symbol is m ³/ s, p ₀for local atmospheric pressure, p _inabfor fan inlet absolute pressure, unit symbol is Pa; K is flow coefficient, and the pressure loss size flowing through the import and export of valve blower fan according to flow gas gets 0.9 ~ 1.3.

Step C: utilize the parameter obtained in step B, and measure blower fan import and export profile cross-section amass, in conjunction with the reading of ammeter, the operational efficiency of blower fan adopts following formulae discovery to obtain:

1) representation of blower fan import and export section gas severe is

${\mathrm{\γ}}_{\mathrm{in}}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{\mathrm{in}}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{\mathrm{in}}}},{\mathrm{\γ}}_{\mathrm{out}}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{\mathrm{out}}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{\mathrm{out}}}},$

2) import and export profile cross-section according to blower fan to amass, obtain blower fan import and export section gas flow rate and be respectively

$v_{\mathrm{in}}=\frac{Q}{F_{\mathrm{in}}},v_{\mathrm{out}}=\frac{Q}{F_{\mathrm{out}}},$

3) blower fan import and export section gas dynamic pressure is expressed as

$p_{\mathrm{din}}=\frac{v_{\mathrm{in}}^2}{2g}\·{\mathrm{\γ}}_{\mathrm{in}},p_{\mathrm{dout}}=\frac{v_{\mathrm{out}}^2}{2g}\·{\mathrm{\γ}}_{\mathrm{out}},$

4) formula of blower fan import and export gas total head is

$H_{\mathrm{in}}=\stackrel{\‾}{p_{\mathrm{in}}}+p_{\mathrm{din}},H_{\mathrm{out}}=\stackrel{\‾}{p_{\mathrm{out}}}+p_{\mathrm{dout}},$

5) representation of blower press is obtained according to above-mentioned result of calculation derivation

H＝H _out-H _in，

6) the correct reading reading ammeter, the formula calculating the air horsepower of blower motor consumption is

$P=\sqrt{3}\mathrm{UI}\cos \mathrm{\φ}$

7) representation then obtaining fan operation efficiency is

$\mathrm{\η}=\frac{\mathrm{QH}}{1000P{\mathrm{\η}}_d{\mathrm{\η}}_t}\×100\%,$

In various above,

γ _ofor air severe under standard state, unit symbol is N/m ³;

γ _in, γ _outbe respectively blower fan import and export gas severe, the equal N/m of unit symbol ³;

F _in, F _outbe respectively blower fan and import and export pipeline sectional area, unit symbol is n ²;

V _in, v _outbe respectively blower fan and import and export gas flow rate, unit symbol is m/s;

G is gravity accleration, and unit symbol is m/s ²;

P _din, p _doutbe respectively blower fan and import and export gas dynamic pressure, unit symbol is Pa;

H _in, H _outbe respectively fan inlet, exit gas total head and blower press with H, unit symbol is Pa;

U, I, P are respectively the air horsepower of blower motor voltage, electric current and consumption, and unit symbol is respectively V, A, W:

φ is the phase difference between motor voltage and electric current, and unit symbol is rad;

Cos φ is motor power factor, and numerical value gets the cosine value of φ;

η _d, η _t, η is respectively the operational efficiency of motor efficiency, transmission efficiency and blower fan, unit symbol is 1.

In the present invention, described ammeter is DSSD719-B type three-phase multifunctional electrical energy meter.

Compared with prior art, the invention has the beneficial effects as follows:

1) integral measuring method of the present invention only by pressure, temperature transducer gather blower fan import and export gas pressure and temperature data, and obtain fan inlet gas flow by calculated with mathematical model, the method fundamentally eliminates the way that tradition plug-in type flow measures compressor flow (flow velocity), engineering construction is easy, reliability is strong, and can realize real-time online measuring;

2) integral measuring method of the present invention is after obtaining fan inlet data on flows, blower fan real time execution efficiency can be calculated rapidly and accurately in conjunction with ammeter reading, and then can Energy Efficiency Analysis be carried out to blower fan system on this basis and propose relevant feasible solution, this has profound significance to the energy-saving and emission-reduction of flow process industrial fan system.

Accompanying drawing explanation

Fig. 1 is that in the integral measuring method of the general fan operation parameter of the present invention, blower fan inlet flow rate calculates preferred implementation flow chart;

Fig. 2 is that in the integral measuring method of the general fan operation parameter of the present invention, blower fan operational efficiency calculates preferred implementation flow chart.

Embodiment

Following embodiment can make the technician of this professional skill field more fully understand the present invention, but does not limit the present invention in any way.

The integral measuring method of a kind of general fan operation parameter that the embodiment of the present invention provides, comprises the steps:

1) temperature transducer and pressure transducer are arranged in the pipeline of blower fan import and export, the pressure and temperature of gas is imported and exported in order to measure blower fan, fan inlet temperature transducer and fan inlet pressure transducer are arranged on the same section of pipeline, fan outlet temperature transducer and fan outlet pressure transducer are also arranged on the same section of pipeline, and ensure not interfere with each other.

2) with reference to figure 1, the gas middle pressure at fan inlet place is measured (Pa), the gas middle pressure at fan outlet place (Pa), the gas mean temperature at fan inlet place (DEG C), the gas mean temperature at fan outlet place (DEG C), and adopt following formulae discovery fan outlet place gas flow Q (m ³/ s):

A. the gas pressure at fan inlet place is divided into N number of sampled point p _in1, p _in2p _inN, the gas pressure at fan outlet place is also divided into N number of sampled point p _out1, p _out2p _outN, unit symbol is Pa, under every bit measurement condition, measures after stablizing 10min, and during measuring, the method for operation should remain unchanged, then fan inlet, outlet average gas pressure are respectively

$\stackrel{\‾}{p_{\mathrm{in}}}=\frac{p_{\mathrm{in}1}+p_{\mathrm{in}2}+......+p_{\mathrm{inN}}}{N},\stackrel{\‾}{p_{\mathrm{out}}}=\frac{p_{\mathrm{out}1}+p_{\mathrm{out}2}+......+p_{\mathrm{outN}}}{N},$ Unit symbol is Pa;

B. the gas at fan inlet place is divided into M sampled point t _in1, t _in2..., t _inM, unit symbol is DEG C; Under every bit measurement condition, measure after stablizing 10min, during measuring, the method for operation should remain unchanged, then fan inlet mean gas temperature is respectively

$\stackrel{\‾}{t_{\mathrm{in}}}=\frac{t_{\mathrm{in}1}+t_{\mathrm{in}2}+......+t_{\mathrm{inM}}}{M},$ Its unit symbol is DEG C;

C. the gas-static difference that blower fan is imported and exported is

$p_k=\stackrel{\‾}{p_{\mathrm{out}}}-\stackrel{\‾}{p_{\mathrm{in}}},$ Unit symbol is Pa;

D. the gas density at fan outlet place represents and is

${\mathrm{\ρ}}_{\mathrm{out}}=\frac{p_{\mathrm{inab}}}{275.2\×(273+\stackrel{\‾}{t_{\mathrm{in}}})}=\frac{\stackrel{\‾}{p_{\mathrm{in}}}+p_o}{275.2\×(273+\stackrel{\‾}{t_{\mathrm{in}}})},$ Unit symbol is kg/m ³;

E. fan outlet place gas flow Q (m ³/ s) representation as follows

$Q=k\·\sqrt{\frac{p_k}{{\mathrm{\ρ}}_{\mathrm{out}}}},$

Wherein, p _k(Pa) for blower fan imports and exports differential static pressure, p ₀(Pa) be local atmospheric pressure, p _inab(Pa) be fan inlet absolute pressure; K is flow coefficient, gets 0.9 ~ 1.3 according to the pressure loss size that gas flow is imported and exported through blower fan.

3) with reference to figure 2, utilize step 2) in the parameter that obtains, one step surveying blower fan of going forward side by side is imported and exported sensor and is arranged that profile cross-section is amassed, and in conjunction with the reading of ammeter, wherein said ammeter is DSSD719-B type three-phase multifunctional electrical energy meter; The operational efficiency of blower fan adopts following formulae discovery to obtain:

A. the representation of blower fan import and export section gas severe is

${\mathrm{\γ}}_{\mathrm{in}}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{\mathrm{in}}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{\mathrm{in}}}},{\mathrm{\γ}}_{\mathrm{out}}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{\mathrm{out}}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{\mathrm{out}}}},$

B. import and export sensor according to blower fan and arrange that profile cross-section is amassed, obtain blower fan import and export section gas flow rate and be respectively

$v_{\mathrm{in}}=\frac{Q}{F_{\mathrm{in}}},v_{\mathrm{out}}=\frac{Q}{F_{\mathrm{out}}},$

C. blower fan import and export section gas dynamic pressure is expressed as

wherein g is gravity accleration, and unit symbol is m/s ²,

D. the formula of blower fan import and export gas total head is

$H_{\mathrm{in}}=\stackrel{\‾}{p_{\mathrm{in}}}+p_{\mathrm{din}},H_{\mathrm{out}}=\stackrel{\‾}{p_{\mathrm{out}}}+p_{\mathrm{dout}},$

E. derive according to above-mentioned result of calculation and obtain the representation of blower press

H＝H _out-H _in，

F. correctly read the reading of ammeter, the formula calculating the air horsepower of blower motor consumption is

$P=\sqrt{3}\mathrm{UI}\cos \mathrm{\φ},$

G. the representation of fan operation efficiency is then finally obtained

$\mathrm{\η}=\frac{\mathrm{QH}}{1000P{\mathrm{\η}}_d{\mathrm{\η}}_t}\×100\%,$

In various above, γ _o(N/m ³) be air severe under standard state, γ _in(N/m ³), γ _out(N/m ³) be blower fan import and export gas severe, F _in(m ²), F _out(m ²) be respectively blower fan import and export pipeline sectional area, v _in(m/s), v _out(m/s) be respectively blower fan and import and export gas flow rate, g is gravity accleration, p _din(Pa), p _dout(Pa) be respectively blower fan and import and export gas dynamic pressure, H _in(Pa), H _out(Pa) be respectively blower fan and import and export gas total head, H (Pa) is blower press, U (V), I (A), P (W) are respectively the air horsepower of motor voltage, electric current, consumption, φ is the phase difference between motor voltage and electric current, cos φ is motor power factor, η _d, η _t, η is respectively the operational efficiency of motor efficiency, transmission efficiency and blower fan.

Above by specific embodiment to invention has been detailed description, this embodiment is only preferred embodiment of the present invention, and it not limits the invention.Without departing from the principles of the present invention; those of ordinary skill in the art by other embodiments all that the modes such as any amendment, equivalent replacement, improvement obtain, all should be considered as in the technical scope that the present invention protects under the prerequisite not making creative work.

Claims (2)

1. an integral measuring method for general fan operation parameter, is characterized in that, described method comprises the steps:

Steps A: temperature, the pressure signal of being measured the import and export gas of blower fan by temperature, pressure transducer;

Step B: fan outlet place gas flow Q calculation procedure is as follows:

1) gas pressure at fan inlet place is divided into N number of sampled point p _in1, p _in2..., p _inN, its unit symbol is Pa; The gas pressure at fan outlet place is also divided into N number of sampled point p _out1, p _out2..., p _outN, its unit symbol is Pa; Under every bit measurement condition, measure after stable, during measuring, the method for operation remains unchanged, then fan inlet, outlet average gas pressure are respectively

$\stackrel{\‾}{p_{in}}=\frac{p_{in1}+p_{in2}+......+p_{inN}}{N},\stackrel{\‾}{p_{out}}=\frac{p_{out1}+p_{out2}+......+p_{outN}}{N},$ Unit symbol is Pa;

2) gas temperature at fan inlet place is divided into M temperature sampling point t _in1, t _in2..., t _inM, unit symbol is DEG C; Under every bit measurement condition, measure after stable, during measuring, the method for operation remains unchanged, then fan inlet mean gas temperature is respectively

$\stackrel{\‾}{t_{in}}=\frac{t_{in1}+t_{in2}+......+t_{inM}}{M},$ Its unit symbol is DEG C;

3) blower fan import and export gas-static difference is

${\mathrm{Vp}}_k=\stackrel{\‾}{p_{out}}-\stackrel{\‾}{p_{in}},$ Unit symbol is Pa;

4) gas density at fan outlet place is

${\mathrm{\ρ}}_{out}=\frac{p_{inab}}{275.2\×(273+\stackrel{\‾}{t_{in}})}=\frac{\stackrel{\‾}{p_{in}}+p_o}{275.2\×(273+\stackrel{\‾}{t_{in}})},$ Unit symbol is kg/m ³;

5) representation of fan outlet place gas flow Q:

$Q=k\·\sqrt{\frac{{\mathrm{Vp}}_k}{{\mathrm{\ρ}}_{out}}},$

Wherein, Q is fan outlet place gas flow, and unit symbol is m ³/ s, p ₀for local atmospheric pressure, p _inabfor fan inlet absolute pressure, unit symbol is Pa; K is flow coefficient, gets 0.9 ~ 1.3 according to the pressure loss size that gas flow is imported and exported through blower fan;

Step C: utilize the parameter obtained in step B, and measure blower fan import and export profile cross-section amass, in conjunction with the reading of ammeter, the operational efficiency of blower fan adopts following formulae discovery to obtain:

1) representation of blower fan import and export section gas severe is

${\mathrm{\γ}}_{in}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{in}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{in}}},{\mathrm{\γ}}_{out}={\mathrm{\γ}}_o\·\frac{p_o+\stackrel{\‾}{p_{out}}}{101325}\·\frac{293}{273+\stackrel{\‾}{t_{out}}},$

2) import and export profile cross-section according to blower fan to amass, obtain blower fan import and export section gas flow rate and be respectively

$v_{in}=\frac{Q}{F_{in}},v_{out}=\frac{Q}{F_{out}},$

3) blower fan import and export section gas dynamic pressure is expressed as

$p_{din}=\frac{v_{in}^2}{2g}\·{\mathrm{\γ}}_{in},p_{dout}=\frac{v_{out}^2}{2g}\·{\mathrm{\γ}}_{out},$

4) formula of blower fan import and export gas total head is

$H_{in}=\stackrel{\‾}{p_{in}}+p_{din},H_{out}=\stackrel{\‾}{p_{out}}+p_{dout},$

5) representation of blower press is obtained according to above-mentioned result of calculation derivation

H＝H _out-H _in，

6) the correct reading reading ammeter, the formula calculating the air horsepower of blower motor consumption is

$P=\sqrt{3}UIcos\mathrm{\φ},$

7) representation then obtaining fan operation efficiency is

$\mathrm{\η}=\frac{QH}{1000{\mathrm{P\η}}_d{\mathrm{\η}}_t}\×100\%,$

In various above,

for fan outlet mean gas temperature, unit symbol is DEG C;

γ _ofor air severe under standard state, unit symbol is N/m ³;

γ _in, γ _outbe respectively blower fan import and export gas severe, the equal N/m of unit symbol ³;

F _in, F _outbe respectively blower fan and import and export pipeline sectional area, unit symbol is m ²;

V _in, v _outbe respectively blower fan and import and export gas flow rate, unit symbol is m/s;

G is gravity accleration, and unit symbol is m/s ²;

P _din, p _doutbe respectively blower fan and import and export gas dynamic pressure, unit symbol is Pa;

H _in, H _outbe respectively fan inlet, exit gas total head and blower press with H, unit symbol is Pa;

U, I, P are respectively the air horsepower of blower motor voltage, electric current and consumption, and unit symbol is respectively V, A, W;

φ is the phase difference between motor voltage and electric current, and unit symbol is rad;

Cos φ is motor power factor, and numerical value gets the cosine value of φ;

η _d, η _t, η is respectively the operational efficiency of motor efficiency, transmission efficiency and blower fan.

2. according to the integral measuring method of the general fan operation parameter described in claim 1, it is characterized in that, described ammeter is DSSD719-B type three-phase multifunctional electrical energy meter.