CN104019859A - Flow measurement system and method for draught fan without flowmeter - Google Patents

Abstract

The invention belongs to the technical field of draught fans, and provides a flow measurement system and method for a draught fan without a flowmeter. The flow measurement system for the draught fan without the flowmeter comprises the draught fan, a pressure collection module, a temperature collection module and a flow calculation module. The pressure collection module comprises two gas pressure detecting sensors which are mounted on an inlet pipeline and an outlet pipeline of the draught fan. The temperature collection module is a temperature detecting sensor which is mounted on the inlet pipeline of the draught fan. The temperature detecting sensor of the inlet of the draught fan and the pressure detecting sensor of the inlet of the draught fan are mounted on the same fracture surface and are not interfered with each other. The flow measurement system and method for the draught fan without the flowmeter have the advantages that according to the flow measurement method, the gas flow of the outlet of the draught fan can be obtained by calculating gas pressure data and temperature data of the inlet and the outlet of the draught fan simply collected by the pressure collection module and the temperature collection module, the method is simple and convenient, maneuverability is high, the measurement range is wide, and flow of various gases with small flow, low pressure and low flow velocity and gases with large flow, high pressure and high flow velocity can be measured.

Description

A kind of for blower fan not with flow quantity detecting system and the method for flowmeter

Technical field

The invention belongs to blower fan technical field, be specifically related to a kind of for blower fan not with flow quantity detecting system and the method for flowmeter.

Background technology

In all kinds of machinery of China's all trades and professions and electrical equipment, blower fan consumption electric energy accounts for 1/3rd of whole nation generating total amount.What is particularly worth mentioning is that, in use all there is the phenomenon of low load with strong power in most of blower fans, in addition because of the variation of the aspects such as production, technique, needs the flow of frequent adjustments of gas.Therefore, air quantity data have very huge meaning to the energy-saving and emission-reduction of blower fan system.

At present, the measurement of blower fan system flow all adopts Pitot tube or other inserting-type flowmeters to measure air velocity conventionally on the pipe surface of fans entrance and Way out, and this kind of metering system exists certain defect in actual moving process.

First, Pitot tube is limit because of itself structure and precision, can not adapt to all blower fan system test requests, and on other inserting-type flowmeter markets existing product normally for the industrial air measurement sensor of the large flow high flow rate high pressure such as rock gas, steam, structure is heavy, generally be fixedly mounted on industrial pipeline, can not move easily.

Secondly, process industry all seals conventionally with blower fan system pipeline, and in pipeline, air all has certain temperature and pressure conventionally, the prerequisite of using Pitot tube or other inserting-type flowmeters is must perforate on pipeline, this is all difficult to realize in security and operability, therefore develop a kind of for blower fan not with flow quantity detecting system and the method for flowmeter, theoretical and realistic meaning is all very large.

Summary of the invention

The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, provide a kind of for blower fan not with flow quantity detecting system and the method for flowmeter.

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

Provide a kind of for blower fan not with the flow quantity detecting system of flowmeter, comprise blower fan, pressure acquisition module, temperature collect module and flow rate calculation module, described pressure acquisition module comprises two gas pressure detection sensors, is arranged on respectively in the import, outlet conduit of blower fan; Described temperature collect module is temperature detection sensor, is arranged on the inlet pipeline of blower fan; Described blower fan inlet temperature detecting sensor and blower fan intake pressure detecting sensor are arranged on same section, and do not interfere with each other; The output terminal of described two gas pressure detection sensors, the output terminal of temperature detection sensor are connected to respectively the input end of flow rate calculation module by signal wire, described flow rate calculation module comprises a controller, for the signal of receiver gases press detection sensor, temperature detection sensor collection and according to this calculated signals fan outlet place gas flow.

In the present invention, described blower fan is induced draft fan, ventilation blower or the fan blower in process industry.

In the present invention, also provide a kind of based on described for blower fan not with the flow rate testing methods of the flow quantity detecting system of flowmeter, the gas flow Q of described fan outlet place calculation procedure is as follows:

1) gaseous tension of blower fan inflow point is divided into N sampled point p _in1, p _in2p _inN, its unit symbol is Pa; The gaseous tension at fan outlet place is also divided into N sampled point p _out1, p _out2 ... p _outN, its unit symbol is Pa; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import, 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 temperature of blower fan inflow point is divided into M sampled point t _in1, t _in2t _inM, unit symbol is ℃; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import average 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 ℃;

3) blower fan imports and exports that gas-static is poor is

unit symbol is Pa;

4) gas density at fan outlet place is

${\mathrm{\ρ}}_{\mathrm{out}}=\frac{p_{\mathrm{inab}}}{275.2\×(273+\stackrel{\‾}{t_{\mathrm{in}}})}=\frac{\stackrel{\‾}{p_{\mathrm{in}}}+p_o}{275.2\×\left(273\stackrel{\‾}{t_{\mathrm{in}}}\right)},$ Unit symbol is kg/m3;

5) expression formula of the gas flow Q of fan outlet place:

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

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

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

1) flow rate testing methods of the present invention has been abandoned the way that installs inserting-type flowmeter additional, the gaseous tension temperature data of only importing and exporting by pressure, temperature collect module collection blower fan calculates fan outlet gas flow, the method is simple and convenient, workable, and measurement range is wide in range, can measure from the low flow velocity that forces down of low discharge to the various gas flows of big-flow high-pressure high flow rate.

2) flow rate testing methods of the present invention has been avoided the construction of punching on technical grade pipeline, has truly accomplished simple and convenient and high security, has certain popularizing application prospect.

Accompanying drawing explanation

Fig. 1 be of the present invention a kind of for blower fan not with the model schematic diagram of the flow quantity detecting system of flowmeter.

Reference numeral: 1, blower fan; 2, pressure acquisition module; 3, temperature collect module; 4, flow rate calculation module.

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 embodiment of the present invention provide a kind of for blower fan not with the flow quantity detecting system of flowmeter, as shown in Figure 1, this flow quantity detecting system comprises blower fan 1, pressure acquisition module 2, temperature collect module 3 and flow rate calculation module 4.

Blower fan 1 comprises induced draft fan conventional in process industry (as Y9-37, Y8-39, Y9-38 type boiler centrifugal draught fan), ventilation blower (as 4-72,9-19,9-26 type centrifugal fan), fan blower models such as () D15～D700 series multistage centrifugal blower, LFSR, LFRR series roots blowers.

Described pressure acquisition module 2 comprises blower fan 1 inlet gas press detection sensor and two parts of blower fan 1 exit gas press detection sensor, described blower fan 1 inlet gas press detection sensor is arranged on the pipeline that approaches blower fan 1 import, blower fan 1 exit gas press detection sensor is arranged on the pipeline that approaches blower fan 1 outlet, by this kind of mode with blower fan 1 import, exit gas is connected and gather pressure data.

Temperature collect module 3 is blower fan 1 inlet temperature detecting sensor, be arranged on the inlet pipeline of blower fan 1, and blower fan 1 inlet temperature detecting sensor and blower fan 1 intake pressure detecting sensor are installed on same section, and do not interfere with each other, by this kind of mode and blower fan 1 collecting temperature data.

Flow rate calculation module 4 comprises a controller, is embedded with to receive data-signal that pressure acquisition module 2, temperature collect module 3 gather and according to the algorithm of the gas flow Q of fan outlet place of this calculated signals blower fan 1.

Embedded algorithm in described controller be in the embodiment of the present invention a kind of based on described for blower fan not with the flow rate testing methods of the flow quantity detecting system of flowmeter, the gas flow Q of described fan outlet place calculation procedure is as follows:

1) gaseous tension of blower fan inflow point is divided into N sampled point p _in1, p _in2p _inN, its unit symbol is Pa; The gaseous tension at fan outlet place is also divided into N sampled point p _out1, p _out2p _outN, its unit symbol is Pa; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import, 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 temperature of blower fan inflow point is divided into M sampled point t _in1, t _in2t _inM, unit symbol is ℃; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import average 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 ℃;

3) blower fan imports and exports that gas-static is poor is

unit symbol is Pa;

4) gas density at fan outlet place is

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

5) expression formula of the gas flow Q of fan outlet place:

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

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

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (3)

1. One kind for blower fan not with the flow quantity detecting system of flowmeter, comprise blower fan, pressure acquisition module, temperature collect module, it is characterized in that, also comprise flow rate calculation module, described pressure acquisition module comprises two gas pressure detection sensors, is arranged on respectively in the import, outlet conduit of blower fan; Described temperature collect module is temperature detection sensor, is arranged on the inlet pipeline of blower fan; Described blower fan inlet temperature detecting sensor and blower fan intake pressure detecting sensor are arranged on same section; The output terminal of described two gas pressure detection sensors, the output terminal of temperature detection sensor are connected to respectively the input end of flow rate calculation module by signal wire, described flow rate calculation module comprises a controller, for the signal of receiver gases press detection sensor, temperature detection sensor collection and according to this calculated signals fan outlet place gas flow.
2. 2. according to the flow quantity detecting system described in claim 1, it is characterized in that, described blower fan is induced draft fan, ventilation blower or the fan blower in process industry.
3. Based on described in claim 1 for blower fan not with a flow rate testing methods for the flow quantity detecting system of flowmeter, it is characterized in that, the gas flow Q of described fan outlet place calculation procedure is as follows:

   1) gaseous tension of blower fan inflow point is divided into N sampled point p _in1, p _in2..., p _inN, its unit symbol is Pa; The gaseous tension at fan outlet place is also divided into N sampled point p _out1, p _out2..., p _outN, its unit symbol is Pa; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import, 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 temperature of blower fan inflow point is divided into M sampled point t _in1, t _in2..., t _inM, unit symbol is ℃; Under every bit test operating mode, after stable, measure, during measuring, the method for operation remains unchanged, and blower fan import average 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 ℃;

   3) blower fan imports and exports that gas-static is poor is

   unit symbol is Pa;

   4) gas density at fan outlet place is

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

   5) expression formula of the gas flow Q of fan outlet place:

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

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