CN102287617B - Device and method for measuring continuous pollution discharge flow rate of power plant boiler steam dome - Google Patents

Device and method for measuring continuous pollution discharge flow rate of power plant boiler steam dome Download PDF

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CN102287617B
CN102287617B CN 201110278503 CN201110278503A CN102287617B CN 102287617 B CN102287617 B CN 102287617B CN 201110278503 CN201110278503 CN 201110278503 CN 201110278503 A CN201110278503 A CN 201110278503A CN 102287617 B CN102287617 B CN 102287617B
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unit
development unit
boiler
flow
steam dome
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CN102287617A (en
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杨海生
常澍平
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
Hebei Electric Power Construction Adjustment Test Institute
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
Hebei Electric Power Construction Adjustment Test Institute
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Abstract

The invention discloses a device and a method for measuring the continuous pollution discharge flow rate of a power plant boiler steam dome. The device consists of a test unit, a data collecting unit and a calculation display unit, wherein the test unit consists of a first pressure sensor, a second pressure sensor, a third pressure sensor and a flow rate sensor, the first pressure sensor is arranged at the boiler steam dome, the second pressure sensor is arranged on a continuous discharge flash tank, the third pressure sensor is arranged on a fixed discharge flash tank, the flow rate sensor is arranged on a water discharge pipeline of the fixed discharge flash tank, the output ends of the first pressure sensor, the second pressure sensor, the third pressure sensor and the flow rate sensorare connected with corresponding input ends of the data collecting unit, and the output end of the data collecting unit is connected with the corresponding input end of the circulation display unit. In the method, a new calculation formula is deduced for calculation in accordance with the prior art. When the device and the method are adopted, the measurement problem of the continuous pollution discharge flow rate of the power plant boiler steam dome in the normal operation is solved, quantitative data are provided for the operation and the overhauling of a power plant, and basis is provided for energy saving and consumption reduction of the power plant.

Description

Measuring device and the method for boiler of power plant drum continuous blowdown flow
Technical field
The present invention relates to a kind of boiler of power plant drum continuous blowdown flow measuring device and method based on the thermal balance method.
Background technique
The continuous blowdown pipeline of boiler-steam dome in the power plant is generally with the platoon development unit of boiler of power plant and arrange development unit surely and directly link to each other.Normally in service, the continuous blowdown of boiler-steam dome at first passes through the dilatation of platoon development unit, hydrophobic again through arranging the development unit dilatation surely after the dilatation, the final hydrophobic trench that drains into.
Along with the electric power unit develops to big capacity high parameter, the continuous blowdown of boiler-steam dome is increasing to the economic influence of power plant in the power plant.Be example with a certain subcritical 300MW unit, increase 1t/h as the boiler-steam dome blowdown flow rate, then will influence the about 0.15g/kW.h of power plant's coal consumption, will consume every year more and mark the about 200t of coal.But the measurement difficulty of the continuous blowdown flow of boiler of power plant drum is very big at present.This mainly is that it is bigger to measure difficulty because drum continuous blowdown pipe interior flowing state is through the two phase flow state after the dilatation.
Summary of the invention
Technical problem to be solved by this invention provides boiler of power plant drum continuous blowdown flow measuring device and the method based on the thermal balance method that a kind of survey data is easy to get.
For solving the problems of the technologies described above, the technical solution used in the present invention 1 is:
A kind of boiler of power plant drum continuous blowdown flow measuring device, it is made of test cell, data acquisition unit and calculating display unit;
Described test cell is by first pressure transducer that is arranged on boiler-steam dome
Figure 2011102785031100002DEST_PATH_IMAGE001
, be arranged on second pressure transducer on the platoon development unit that is connected with the continuous blowdown pipeline of described boiler-steam dome
Figure 2011102785031100002DEST_PATH_IMAGE002
, be arranged on the 3rd pressure transducer on row's development unit decided that is connected with described platoon development unit
Figure 2011102785031100002DEST_PATH_IMAGE003
And be arranged on the flow transducer of deciding on row's development unit drainage pipe Constitute;
The output terminal of described first ~ the 3rd pressure transducer and flow transducer connects the respective input of data acquisition unit respectively;
The output termination of described data acquisition unit is calculated the respective input of display unit;
Adopt the method for measurement of carrying out boiler of power plant drum continuous blowdown flow of described measuring device, carry out according to following step:
Figure 2011102785031100002DEST_PATH_IMAGE005
Data capture and input:
After handling by data acquisition unit, the signal that first ~ the 3rd pressure transducer and flow transducer are collected inputs to the calculating display unit;
Figure 2011102785031100002DEST_PATH_IMAGE006
Calculate the data of display unit utilization input
Figure 591913DEST_PATH_IMAGE003
,
Figure 2011102785031100002DEST_PATH_IMAGE007
With
Figure 834807DEST_PATH_IMAGE001
Calculate intermediate variable according to the following equation respectively
Figure 2011102785031100002DEST_PATH_IMAGE008
,
Figure 2011102785031100002DEST_PATH_IMAGE009
,
Figure 2011102785031100002DEST_PATH_IMAGE010
, With
Figure 2011102785031100002DEST_PATH_IMAGE012
:
Figure 2011102785031100002DEST_PATH_IMAGE013
（1）
Figure 2011102785031100002DEST_PATH_IMAGE014
（2）
Figure 2011102785031100002DEST_PATH_IMAGE015
（3）
Figure 2011102785031100002DEST_PATH_IMAGE016
（4）
Figure 2011102785031100002DEST_PATH_IMAGE017
（5）
In formula (1) ~ (5),
Figure 2011102785031100002DEST_PATH_IMAGE018
Be the 3rd pressure transducer measure decide row's development unit pressure, units MPa,
Be the platoon development unit pressure that second pressure transducer measures, units MPa,
Be the boiler-steam dome pressure that first pressure transducer measures, units MPa,
Figure 637284DEST_PATH_IMAGE008
Arrange the atmosphere steam enthalpy for arranging development unit surely, the kJ/kg of unit,
Figure 912408DEST_PATH_IMAGE009
For arranging the hydrophobic enthalpy of development unit surely, the kJ/kg of unit,
Figure 365998DEST_PATH_IMAGE010
Be the enthalpy of platoon development unit recovered steam, the kJ/kg of unit,
Figure 763482DEST_PATH_IMAGE011
Be the hydrophobic enthalpy of platoon development unit, the kJ/kg of unit,
Be the enthalpy of boiler-steam dome continuous blowdown medium, the kJ/kg of unit,
Described function
Figure 2011102785031100002DEST_PATH_IMAGE021
~
Figure 2011102785031100002DEST_PATH_IMAGE022
Correlation computations formula according to international water and steam characteristic association (IAPWS) is tried to achieve;
Figure 2011102785031100002DEST_PATH_IMAGE023
With step
Figure 446584DEST_PATH_IMAGE005
In flow transducer measure gained decide the hydrophobic flow of row's development unit
Figure 757611DEST_PATH_IMAGE004
And step
Figure 529258DEST_PATH_IMAGE006
In the intermediate variable that calculates calculate boiler-steam dome continuous blowdown flow according to formula (6):
Figure 2011102785031100002DEST_PATH_IMAGE024
（6）
In the formula,
Figure 355262DEST_PATH_IMAGE004
For arranging the hydrophobic flow of development unit surely, units/s,
Figure DEST_PATH_IMAGE025
Be boiler-steam dome continuous blowdown flow, units/s.
Technique scheme is carried out measurement and the calculating of boiler-steam dome continuous blowdown flow according to thermomechanics and hydromechanical correlative principle, and basic principle is as follows:
The ratio of the hydrophobic flow of platoon development unit and boiler-steam dome continuous blowdown flow calculates by formula (7):
Figure DEST_PATH_IMAGE026
(7)
In the formula,
Figure DEST_PATH_IMAGE027
Be the enthalpy of boiler-steam dome continuous blowdown medium, the kJ/kg of unit, its value equals saturation water enthalpy under the boiler-steam dome pressure;
Figure DEST_PATH_IMAGE028
Be boiler-steam dome continuous blowdown flow, units/s;
Figure DEST_PATH_IMAGE029
Be the hydrophobic enthalpy of platoon development unit, the kJ/kg of unit, its value equals saturation water enthalpy under the platoon development unit pressure;
Figure DEST_PATH_IMAGE030
Be the hydrophobic flow of platoon development unit, units/s;
Be the enthalpy of platoon development unit recovered steam, the kJ/kg of unit, its value equals saturated vapour enthalpy under the platoon development unit pressure;
Figure DEST_PATH_IMAGE032
Be the flow of platoon development unit recovered steam, units/s.
Surely the ratio of arranging the hydrophobic flow of development unit and the hydrophobic flow of platoon development unit calculates by formula (8):
（8）
In the formula, h Dps , m Dps Be respectively and decide the hydrophobic enthalpy of row's development unit and flow, unit is respectively kJ/kg, kg/s, h Dps Enthalpy equal to decide saturation water enthalpy under row's development unit pressure;
h Dpq , m Dpq Be respectively and decide row's development unit row's atmosphere steam enthalpy and flow, unit is respectively kJ/kg, kg/s, h Dpq Enthalpy equal to decide saturated vapour enthalpy under row's development unit pressure.
With formula (7) and formula (8) simultaneous, get formula (9):
Figure DEST_PATH_IMAGE034
(9)
Got by formula (9):
Figure 595357DEST_PATH_IMAGE024
（6）
By formula (6) as can be seen, boiler-steam dome continuous blowdown flow can be arranged the hydrophobic flow of development unit and boiler platoon development unit surely by boiler, the medium parameter of arranging development unit, boiler-steam dome surely obtains after calculating.This is measurement of the present invention and calculating principle just.
The beneficial effect that adopts technique scheme to produce is as follows:
(1) externally measured and calculation mode is adopted in flow measurement of the present invention, mainly by boiler-steam dome, platoon development unit, arrange the pressure transducer on the development unit and arrange flow measuring sensor on the development unit drain water piping surely surely, handle by data acquisition unit after obtaining the heating power data, finally in calculating display unit, realize calculating and demonstration to boiler-steam dome continuous blowdown flow.Adopt technique scheme to solve the measurement problem of normal boiler of power plant drum continuous blowdown flow in service, provide quantitative data for power plant moves and overhauls, the energy-saving and cost-reducing foundation that provides of power plant is provided.
(2) the present invention can carry out continuous monitoring to power plant's drum continuous blowdown flow, has satisfied the needs of economy of power plant analysis.
Description of drawings
Fig. 1 is functional block diagram of the present invention;
Fig. 2 is that the measuring point of test cell of the present invention is arranged schematic representation.
Embodiment
Referring to Fig. 1 and Fig. 2, the present invention is made of test cell, data acquisition unit and calculating display unit;
The continuous blowdown pipeline of boiler-steam dome in the present embodiment is with the platoon development unit and arrange development unit surely and directly link to each other.Normally in service, the continuous blowdown of boiler-steam dome at first passes through the dilatation of platoon development unit, hydrophobic again through arranging the development unit dilatation surely after the dilatation, the final hydrophobic trench that drains into;
Described test cell is by first pressure transducer that is arranged on boiler-steam dome
Figure DEST_PATH_IMAGE035
, be arranged on second pressure transducer on the platoon development unit
Figure 10158DEST_PATH_IMAGE002
, be arranged on the 3rd pressure transducer of deciding on row's development unit
Figure 952706DEST_PATH_IMAGE003
And be arranged on the flow transducer of deciding on row's development unit drainage pipe Constitute;
The output terminal of described first ~ the 3rd pressure transducer and flow transducer connects the respective input of data acquisition unit respectively;
The output termination of described data acquisition unit is calculated the respective input of display unit.The model of described data acquisition unit is OM-DAQPRO-6300; Described calculating display unit is notebook computer or computation host and display device.
In the present embodiment, first ~ the 3rd pressure transducer and the flow transducer is installed at first; Connecting line with the sensor is connected with data acquisition unit then, in the present embodiment with the line line of sensor by bolton on the terminal of data acquisition unit; At last data acquisition unit is connected by connection with the calculating display unit.When first ~ the 3rd pressure transducer is installed, be that the jointing with pressure transducer links to each other with the pressure pressure tube.
In the present embodiment, should note after pressure transducer installs, needing the separating valve of cracking pressure pressure tube.After this device is finished using, at first behind the separating valve of closing pressure pressure tube, can dismantle pressure transducer during dismounting.
After installing, the test of present embodiment and the concrete steps of calculating are as follows:
Figure 686624DEST_PATH_IMAGE005
Data capture and input:
After handling by data acquisition unit, the signal that first ~ the 3rd pressure transducer and flow transducer are collected inputs to the calculating display unit;
Calculate the data of display unit utilization input
Figure 348342DEST_PATH_IMAGE003
,
Figure 70311DEST_PATH_IMAGE007
With
Figure 294619DEST_PATH_IMAGE001
Calculate intermediate variable according to the following equation respectively
Figure 169165DEST_PATH_IMAGE008
,
Figure 453516DEST_PATH_IMAGE009
,
Figure 193939DEST_PATH_IMAGE010
, With
Figure 950990DEST_PATH_IMAGE012
:
Figure 202980DEST_PATH_IMAGE013
（1）
Figure 102803DEST_PATH_IMAGE014
（2）
Figure 481963DEST_PATH_IMAGE015
（3）
Figure 783631DEST_PATH_IMAGE016
（4）
Figure 206522DEST_PATH_IMAGE017
（5）
In formula (1) ~ (5), Be the 3rd pressure transducer measure decide row's development unit pressure, units MPa,
Described function
Figure 62579DEST_PATH_IMAGE021
~
Figure 749912DEST_PATH_IMAGE022
Correlation computations formula according to IAPWS is tried to achieve;
Figure 546967DEST_PATH_IMAGE023
With step In flow transducer measure gained decide the hydrophobic flow of row's development unit
Figure 204661DEST_PATH_IMAGE004
And step
Figure 28392DEST_PATH_IMAGE006
In the intermediate variable that calculates calculate boiler-steam dome continuous blowdown flow according to formula (6):
Figure 996348DEST_PATH_IMAGE024
（6）
In the formula,
Figure 154797DEST_PATH_IMAGE004
For arranging the hydrophobic flow of development unit surely, units/s,
Be boiler-steam dome continuous blowdown flow, units/s.

Claims (1)

1. the measuring device of a boiler of power plant drum continuous blowdown flow is characterized in that it is made of test cell, data acquisition unit and calculating display unit;
Described test cell is by first pressure transducer that is arranged on boiler-steam dome
Figure 2011102785031100001DEST_PATH_IMAGE001
, be arranged on second pressure transducer on the platoon development unit that is connected with the continuous blowdown pipeline of described boiler-steam dome
Figure 2011102785031100001DEST_PATH_IMAGE002
, be arranged on the 3rd pressure transducer on row's development unit decided that is connected with described platoon development unit
Figure 2011102785031100001DEST_PATH_IMAGE003
And be arranged on the flow transducer of deciding on row's development unit drainage pipe
Figure 2011102785031100001DEST_PATH_IMAGE004
Constitute;
The output terminal of described first ~ the 3rd pressure transducer and flow transducer connects the respective input of data acquisition unit respectively;
The output termination of described data acquisition unit is calculated the respective input of display unit;
The method of measuring of described measuring device is carried out according to following step:
Data capture and input:
After handling by data acquisition unit, the signal that first ~ the 3rd pressure transducer and flow transducer are collected inputs to the calculating display unit;
Figure DEST_PATH_IMAGE006
Calculate the data of display unit utilization input
Figure 80395DEST_PATH_IMAGE003
,
Figure DEST_PATH_IMAGE007
With
Figure 810585DEST_PATH_IMAGE001
Calculate intermediate variable according to the following equation respectively
Figure DEST_PATH_IMAGE008
, ,
Figure DEST_PATH_IMAGE010
, With
Figure DEST_PATH_IMAGE012
:
Figure DEST_PATH_IMAGE013
（1）
Figure DEST_PATH_IMAGE014
（2）
（3）
Figure DEST_PATH_IMAGE016
（4）
Figure DEST_PATH_IMAGE017
（5）
In formula (1) ~ (5),
Figure 213491DEST_PATH_IMAGE003
Be the 3rd pressure transducer measure decide row's development unit pressure, units MPa,
Figure DEST_PATH_IMAGE018
Be the platoon development unit pressure that second pressure transducer measures, units MPa,
Figure DEST_PATH_IMAGE019
Be the boiler-steam dome pressure that first pressure transducer measures, units MPa,
Figure 484066DEST_PATH_IMAGE008
Arrange the atmosphere steam enthalpy for arranging development unit surely, the kJ/kg of unit,
Figure 360755DEST_PATH_IMAGE009
For arranging the hydrophobic enthalpy of development unit surely, the kJ/kg of unit,
Figure 183218DEST_PATH_IMAGE010
Be the enthalpy of platoon development unit recovered steam, the kJ/kg of unit,
Figure 260371DEST_PATH_IMAGE011
Be the hydrophobic enthalpy of platoon development unit, the kJ/kg of unit,
Figure 521588DEST_PATH_IMAGE012
Be the enthalpy of boiler-steam dome continuous blowdown medium, the kJ/kg of unit,
Described function
Figure DEST_PATH_IMAGE020
~ Correlation computations formula according to IAPWS is tried to achieve;
With step
Figure 65833DEST_PATH_IMAGE005
In flow transducer measure gained decide the hydrophobic flow of row's development unit And step
Figure 626575DEST_PATH_IMAGE006
In the intermediate variable that calculates calculate boiler-steam dome continuous blowdown flow according to formula (6):
Figure DEST_PATH_IMAGE023
（6）
In the formula,
Figure 425904DEST_PATH_IMAGE004
For arranging the hydrophobic flow of development unit surely, units/s,
Figure DEST_PATH_IMAGE024
Be boiler-steam dome continuous blowdown flow, units/s.
CN 201110278503 2011-09-20 2011-09-20 Device and method for measuring continuous pollution discharge flow rate of power plant boiler steam dome Active CN102287617B (en)

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Publication number Priority date Publication date Assignee Title
US5539382A (en) * 1995-04-21 1996-07-23 Carrier Corporation System for monitoring the operation of a condenser unit
CN2433514Y (en) * 2000-08-08 2001-06-06 西安交通大学 Vapour-liquid two-phase flow condensation wave boiler steam pocket water-level control device
CN100368779C (en) * 2005-02-03 2008-02-13 东北电力学院 Safety on-line monitor for water circulation of boiler
JP4869086B2 (en) * 2007-01-19 2012-02-01 中国電力株式会社 Condenser cooling pipe reverse cleaning system and cleaning method thereof
CN201652310U (en) * 2010-03-02 2010-11-24 李晓明 Steam boiler automatic control system
CN202471151U (en) * 2012-03-01 2012-10-03 河北省电力研究院 Blowdown flow measurement device applied to boiler drum of power plant

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