CN104165710A - Device and method for testing thermal balance of gas cooker - Google Patents
Device and method for testing thermal balance of gas cooker Download PDFInfo
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- CN104165710A CN104165710A CN201410249328.7A CN201410249328A CN104165710A CN 104165710 A CN104165710 A CN 104165710A CN 201410249328 A CN201410249328 A CN 201410249328A CN 104165710 A CN104165710 A CN 104165710A
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Abstract
The invention relates to a device for testing thermal balance of a gas cooker, solves the problem of measurement of energy loss in novel cooker design, and provides support for improving cooker design and reducing energy loss. According to the device, based on a combustion principle, by measurement of hot water temperature, smoke component analysis, radiation intensity and temperatures of upper and lower ends of a furnace end, effective heat absorption energy, smoke loss energy, radiation loss energy, and heat conduction loss energy are estimated. By measuring gas flow, total energy of gas consumption is estimated. Thus a main energy consumption proportion of a tested cooker can be obtained, thereby providing test data support for further improving cooker design. The device for testing thermal balance of the gas cooker in the invention adopts computer measurement and control technology, and achieves the effect of automatically realizing signal acquisition, data processing and data management functions. And automated testing of cooker energy conversion and distribution is realized.
Description
Technical field
The present invention relates to a kind of gas kitchen ranges thermal equilibrium proving installation and method, is automatic test device and computing method that a kind of gas kitchen ranges energy efficiency and thermal loss are estimated.Belong to thermal measurement and control technology field.
Background technology
In the development process of household gas utensils, need to, by estimating flue gas loss, radiation heat loss, heat conduction loss and effectively absorbing the indexs such as heat, instruct the Design & reform of household gas utensils.
At present, GB GB16410-2007 has stipulated the method for testing of household gas utensils effective rates of utilization.But do not provide the become estranged measuring method of heat conduction loss of flue gas loss, radiation heat loss.Because there is no directly to measure the sensor of flue gas loss, radiation heat loss, heat conduction loss, there is no at present such device.And the approach information of gas kitchen ranges energy loss is to New type kitchen range great significance for design.
Patented claim of the present invention has proposed effective heat absorption, the radiation heat loss of a kind of household gas utensils in its conversion process of energy become estranged measurement and the method for estimation of heat conduction loss, can measure after combustion gas burns by kitchen range, the energy effectively being absorbed, and by the energy of the approach losses such as flue gas, radiation and heat conduction, for kitchen range design provides basic test instrument.
Summary of the invention
The object of the invention is to for prior art Shortcomings, a kind of gas kitchen ranges thermal equilibrium proving installation and method are provided, needs while designing for household gas utensils, can quick and precisely estimate that the total amount of heat that combustion gas discharges is effectively absorbed, and by the heat of the approach losses such as smoke evacuation, heat conduction, radiation, for improving household gas utensils efficiency, provide foundation.
For achieving the above object, the present invention adopts following technical proposals:
A gas kitchen ranges thermal equilibrium proving installation, comprises display, computing machine, PLC controller, flue gas analyzer, multi channel signals transducer, combustion gas wet flow indicator, solenoid valve, radiation intensity sensor, burner lower end temperature sensor, burner upper end temperature sensor, cooling-water temperature sensor, flue-gas temperature sensor, tested kitchen range, smoke collecting device, the kettle that is filled with water, environment temperature sensor and radiation intensity sensor stand.It is characterized in that: described environment temperature sensor is arranged in the environment of kettle place, flue-gas temperature installation of sensors is on smoke collecting device, smoke collecting device is arranged on flue gas circulation place of kettle bottom, cooling-water temperature sensor is fixed on above kettle lid and its probe inserts in water, radiation intensity installation of sensors is below kettle on flame annular stent around, burner upper end temperature sensor is arranged on kitchen range upper end, and burner lower end temperature sensor is arranged on kitchen range bottom surface; The output terminal of listed environment temperature sensor, flue-gas temperature sensor, cooling-water temperature sensor, radiation intensity sensor, burner upper end temperature sensor, burner lower end temperature sensor is connected to computing machine through a multi channel signals transducer; Described computing machine connects display and PLC controller; PLC controller connected electromagnetic valve and combustion gas wet flow indicator; The signal of described environment temperature sensor, flue-gas temperature sensor, cooling-water temperature sensor, radiation intensity sensor, burner upper end temperature sensor, burner lower end temperature sensor is delivered to multi channel signals transducer, and multi channel signals transducer is converted into digital signal and is sent to computing machine and calculates; Smoke collecting device is measured CO in flue gas through fume component analysis instrument after gathering flue gas
2, N
2, O
2, CO, H
2the composition of O, is sent to computing machine and calculates; Computing machine is controlled solenoid valve through PLC controller.
Described cooling-water temperature sensor adopts thermal resistance Pt100; Described radiation intensity sensor adopts RHFS30; Described burner upper end temperature sensor and burner lower end temperature sensor adopt Pt100; Described environment temperature sensor adopts Pt100; Described flue-gas temperature sensor adopts Pt100; Described multi channel signals converter using SQ2040; Described PLC controller adopts the prompt XC3 series of PLC of letter; Described flue gas analyzer adopts the reinforced flue gas analyzer of Siemens testo350.
A gas kitchen ranges thermal equilibrium method of testing, adopts said apparatus to test, and it is characterized in that operation steps is as follows:
1) add the water of set amount:
To in the kettle that be filled with water, add the water of set amount, record add the quality of water, and be input in computing machine.The kettle that is filled with water is placed on measured kitchen range.
2) import parameter:
From keyboard input specific heat of water value, the quality of water in kettle; Low heat value from keyboard input combustion gas; From keyboard, the result of Gas Components is input to computing machine; Specifically comprise: m value and n value in combustion gas CmHn component; From keyboard, input burner thickness, burner external diameter, burner coefficient of heat conductivity information; By the data importing in the mean specific heat in mean specific heat calculating table in computing machine.
3) light kitchen range:
Light after kitchen range, computing machine says the word according to setting PLC controller.
4) thermal equilibrium is measured:
1. measure and consume combustion gas total amount of heat;
2. measure and effectively absorb heat;
3. measure flue gas thermal loss;
4. measuring radiation thermal loss;
5. measure conductive heat loss;
According to collection period 5 minutes, within every five minutes, repeat above-mentioned steps 2)-4) once, until user feels to obtain result stably.
In said method, according to following computing method, calculate thermal equilibrium:
1) according to the sampling time of 5 minutes, within every 5 minutes, measure gas flow, and by the consumption combustion gas volume of measuring
, the m of unit
3, and the low heat value of combustion gas
, unit: MJ/m
3, estimate in real time the total amount of heat that combustion gas discharges
, unit: kJ; Its computing method are:
2) according to the sampling time of 5 minutes, within every 5 minutes, measure the water temperature in kettle, and with prefiring initial water temperature comparison, obtain the real-time temperature difference
, unit ℃; Utilize the quality m of water in pot, units/kg, specific heat of water
, the kJ/ of unit (kg. ℃), estimates effectively caloric receptivity in real time
, the kJ of unit; Wherein, in pot, quality and the specific heat of water of water arranged by keyboard; The computing method of asking for effective caloric receptivity are:
3) according to following steps, measure flue gas thermal loss:
3.1), according to the sampling time of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to the combustion gas of setting
in component
value and
value, calculates and obtains theoretical air requirement by following formula
, the m of unit
3; Computing formula is as follows:
3.2) according to the sampling time of 5 minutes, every 5 minutes measures ambient temperature
, and the theoretical air requirement obtaining according to step 1)
, calculate and obtain theoretical air enthalpy
, the kJ of unit; Computing formula is as follows:
3.3), according to the sampling period of 5 minutes, within every 5 minutes, measure that fume component analysis instrument measures
,
,
composition, unit is %, is designated as respectively
,
,
.Calculate thus excess air coefficient
; Computing formula is:
3.4), according to the sampling period of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to combustion gas
component
value and
value, obtains in flue gas
with
volume
,
volume
,
volume
, unit: m
3; Its computing formula is:
In flue gas
with
volume
computing formula be:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
3.5) obtain actual dry flue gas amount
and exhaust gas volumn
, unit: m
3, its computing formula is:
Obtain actual dry flue gas amount
computing formula:
Obtain exhaust gas volumn
count calculation formula:
3.6), according to 5 minute sampling period, within every 5 minutes, measure flue-gas temperature
, unit ℃; Looking into table 1 mean specific heat in accompanying drawing, with showing, obtains in flue gas
,
,
,
,
mean specific heat
,
,
,
,
, the kJ/ of unit (kg. ℃); By following formula, ask dry flue gas mean specific heat
:
3.7) by following formula, ask smoke evacuation enthalpy
, the kJ of unit:
3.8) by following formula, calculate heat loss due to exhaust gas
, the kJ of unit:
4) according to 5 minutes employing cycles, the radiation intensity of 8 radiation intensity sensors of sampling in every 5 minutes
,
the kW/m of unit
2; The measured value of each radiation intensity sensor has represented the radiation intensity of the face of cylinder part of its representative, because be to be evenly arranged on right cylinder, so each radiation sensor represents that right cylinder side surface area is:
Measurement based on radiation intensity, can calculate the radiation heat loss who starts up till now from measuring
, the kJ of unit:
Wherein:
represent the sampling period, the sampling period is 5 minutes;
for from starting the total sampling number to current time;
5) according to 5 minutes sampling periods, every 5 minutes sampling burner place upside measuring point temperature
, unit
0c, actual measurement burner place upside measuring point temperature
, unit
0c; Measure in advance burner thickness H, burner coefficient of heat conductivity
(w/cm.k), burner external diameter r1(m), and be input to computing machine by keyboard; Heat conduction loss
be calculated as follows:
。
The present invention compared with prior art, has the following remarkable technical progress of apparent outstanding substantive distinguishing features:
By the tested heating water temperature of automatic real-time measurement, environment temperature, gas flow, radiation intensity, flue-gas temperature, fume component analysis etc., and by keyboard, pre-enter the size of Gas Components information, gas furnace, the information such as the quality of heating water, calculate to obtain and effectively absorb heat, flue gas thermal loss, radiation heat loss, the total amount of heat of heat conduction loss and gas consumption.For the mode of Domestic gas range tool energy conversion provides measurement data, support, for improving better kitchen range design, provide strong Data support.
Accompanying drawing explanation
Fig. 1 is formation picture of device of the present invention.
Fig. 2 is thermal equilibrium test of the present invention and computing method step.
Fig. 3 is that in the present invention, flue gas thermal loss is measured and computing method step.
Fig. 4 is radiation sensor installation diagram in the present invention.
Fig. 5 is temperature sensor installation site, burner upper end figure in the present invention.
Table 1 is the mean specific heat calculating table that the present invention need to use.
Embodiment
Details are as follows by reference to the accompanying drawings for the preferred embodiments of the present invention:
Embodiment mono-:
Referring to Fig. 1, this gas kitchen ranges thermal equilibrium proving installation, comprise display (1), computing machine (2), PLC controller (3), flue gas analyzer (5), multi channel signals transducer (6), combustion gas wet flow indicator (8), solenoid valve (9), radiation intensity sensor (10), burner lower end temperature sensor (11), burner upper end temperature sensor (12), cooling-water temperature sensor (13), flue-gas temperature sensor (14), tested kitchen range (15), smoke collecting device (17), kettle (18) is filled with water, environment temperature sensor (20) and radiation intensity sensor stand (26).It is characterized in that: described environment temperature sensor (20) is arranged in the environment of kettle (18) place, flue-gas temperature sensor (14) is arranged on smoke collecting device (17), smoke collecting device (17) is arranged on kettle (18) bottom flue gas circulation place, cooling-water temperature sensor (13) is fixed on that kettle (18) covers face and its probe inserts in water, radiation intensity sensor (10) is arranged on kettle (18) below on flame annular stent around, burner upper end temperature sensor (12) is arranged on kitchen range (15) upper end, burner lower end temperature sensor (11) is arranged on kitchen range (15) bottom surface, the output terminal of listed environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is connected to computing machine (2) through a multi channel signals transducer (6), described computing machine (2) connects display (1) and PLC controller (3), PLC controller (3) connected electromagnetic valve (9) and combustion gas wet flow indicator (8), the signal of described environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is delivered to multi channel signals transducer (6), and multi channel signals transducer (6) is converted into digital signal and is sent to computing machine (2) and calculates, smoke collecting device (17) is measured CO in flue gas through fume component analysis instrument (5) after gathering flue gas
2, N
2, O
2, CO, H
2the composition of O, is sent to computing machine (2) and calculates, computing machine (2) is controlled solenoid valve (9) through PLC controller (3).
Embodiment bis-:
The present embodiment and embodiment mono-are basic identical, and special feature is as follows:
Described cooling-water temperature sensor (13) adopts thermal resistance Pt100; Described radiation intensity sensor (10) adopts RHFS30; Described burner upper end temperature sensor (12) and burner lower end temperature sensor (11) adopt Pt100; Described environment temperature sensor (20) adopts Pt100; Described flue-gas temperature sensor (41) adopts Pt100; Described multi channel signals transducer (6) adopts SQ2040; Described PLC controller (3) adopts the prompt XC3 series of PLC of letter; Described flue gas analyzer (5) adopts the reinforced flue gas analyzer of Siemens testo350.
Embodiment tri-:
Referring to Fig. 1, this gas kitchen ranges thermal equilibrium proving installation, by display (1), main frame (2), PLC controller (3), controllor for step-by-step motor (4), flue gas analyzer (5), multi channel signals transducer (6), hand valve (7), combustion gas wet flow indicator (8), solenoid valve (9), radiation intensity sensor (10), burner lower end temperature sensor (11), burner upper end temperature sensor (12), cooling-water temperature sensor (13), flue-gas temperature sensor (14), tested kitchen range (15), stirrer chassis (16), smoke collecting device (17), kettle (18) is filled with water, stirrer branch bar (19), environment temperature sensor (20), screw mandrel (21), stepper motor (22), screw mandrel fixed support (23), upper plane (24), upper plane fixed bracket (25) and radiation intensity sensor stand (26), the combustion gas energy that completes kitchen range consumption changes into effective absorption energy, flue gas off-energy, the estimation of radiation loss energy and heat conduction loss energy.Environment temperature sensor (20) is arranged in the environment of kettle (18) place, flue-gas temperature sensor (14) is arranged on smoke collecting device (17), smoke collecting device (17) is arranged on kettle (18) bottom flue gas circulation place, cooling-water temperature sensor (13) is fixed on that kettle (18) covers face and its probe inserts in water, radiation intensity sensor (10) is arranged on kettle (18) below on flame annular stent around, burner upper end temperature sensor (12) is arranged on kitchen range (15) upper end, burner lower end temperature sensor (11) is arranged on kitchen range (15) bottom surface, the output terminal of environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is connected to computing machine (2) through a multi channel signals transducer (6), computing machine (2) connects display (1) and PLC controller (3), PLC controller (3) connected electromagnetic valve (9), controllor for step-by-step motor (4) and combustion gas wet flow indicator (8), the signal of environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is delivered to multi channel signals transducer (6), and multi channel signals transducer (6) is converted into digital signal and is sent to computing machine (2) and calculates, smoke collecting device (17) is measured CO in flue gas through fume component analysis instrument (5) after gathering flue gas
2, N
2, O
2, CO, H
2the composition of O, is sent to computing machine (2) and calculates, computing machine (2) is controlled solenoid valve (9) and controllor for step-by-step motor (4) through PLC controller (3).Computing machine (2) sends forward/reversion, the rotating speed order of stepper motor, by PLC controller (3) control step electric machine controller (4), and Driving Stepping Motor (22) motion.With the coaxial screw mandrel being connected of stepper motor (22) (21), rotatablely moving of stepper motor (22) is converted to rectilinear motion, stirrer branch bar (19) by stressed joint drives stirrer chassis (16) to move up and down, and reaches the beating action to healed water.
Embodiment tetra-:
Referring to Fig. 1 ~ Fig. 5, this gas kitchen ranges thermal equilibrium method of testing, adopts said apparatus to test, and it is characterized in that concrete operation step is as follows:
1) add the water of set amount:
To be filled with water and add the water of set amount in kettle (18), record add the quality of water, and be input in computing machine (2).The kettle (18) that will be filled with water is placed on measured kitchen range (15).
2) import parameter:
From keyboard input specific heat of water value, the quality of water in kettle; Low heat value from keyboard input combustion gas; From keyboard, the result of Gas Components is input to computing machine (2); Specifically comprise: m value and n value in combustion gas CmHn component; From keyboard, input burner thickness, burner external diameter, burner coefficient of heat conductivity information; Mean specific heat is calculated with the data importing in the mean specific heat in Fig. 6 in computing machine (2).
3) light kitchen range:
Light after kitchen range (15), computing machine (2) says the word according to setting PLC controller.
4) thermal equilibrium is measured:
1. measure and consume combustion gas total amount of heat;
2. measure and effectively absorb heat;
3. measure flue gas thermal loss;
4. measuring radiation thermal loss;
5. measure conductive heat loss;
According to collection period 5 minutes, within every five minutes, repeat above-mentioned steps 2)-4) once, until user feels to obtain result stably.
Embodiment five:
The present embodiment and embodiment tetra-are basic identical, and special feature is as follows:
According to following computing method, calculate thermal equilibrium.
1) according to the sampling time of 5 minutes, within every 5 minutes, measure gas flow, and by the consumption combustion gas volume of measuring
, the m of unit
3, and the low heat value of combustion gas
, unit: MJ/m
3, estimate in real time the total amount of heat that combustion gas discharges
, unit: kJ; Its computing method are:
2) according to the sampling time of 5 minutes, within every 5 minutes, measure the water temperature in kettle, and with prefiring initial water temperature comparison, obtain the real-time temperature difference
, unit ℃; Utilize the quality m of water in pot, units/kg, specific heat of water
, the kJ/ of unit (kg. ℃), estimates effectively caloric receptivity in real time
, the kJ of unit; Wherein, in pot, quality and the specific heat of water of water arranged by keyboard; The computing method of asking for effective caloric receptivity are:
3) according to following steps, measure flue gas thermal loss:
3.1), according to the sampling time of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to the combustion gas of setting
in component
value and
value, calculates and obtains theoretical air requirement by following formula
, the m of unit
3; Computing formula is as follows:
3.2) according to the sampling time of 5 minutes, every 5 minutes measures ambient temperature
, and the theoretical air requirement obtaining according to step 1)
, calculate and obtain theoretical air enthalpy
, the kJ of unit; Computing formula is as follows:
3.3), according to the sampling period of 5 minutes, within every 5 minutes, measure that fume component analysis instrument measures
,
,
composition, unit is %, is designated as respectively
,
,
.Calculate thus excess air coefficient
; Computing formula is:
3.4), according to the sampling period of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to combustion gas
component
value and
value, obtains in flue gas
with
volume
,
volume
,
volume
, unit: m
3; Its computing formula is:
In flue gas
with
volume
computing formula be:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
3.5) obtain actual dry flue gas amount
and exhaust gas volumn
, unit: m
3, its computing formula is:
Obtain actual dry flue gas amount
computing formula:
Obtain exhaust gas volumn
count calculation formula:
3.6), according to 5 minute sampling period, within every 5 minutes, measure flue-gas temperature
, unit ℃; Looking into table 1 mean specific heat in accompanying drawing, with showing, obtains in flue gas
,
,
,
,
mean specific heat
,
,
,
,
, the kJ/ of unit (kg. ℃); For example,, when actual measurement flue-gas temperature is 400
0c, looks into row corresponding to Fig. 6 first row temperature, in corresponding diagram 6 in flue gas
,
,
,
,
mean specific heat
,
,
,
,
(secondary series, the 3rd row, the 4th row, the 6th row, the 5th row), obtaining its value is 1.9297,1.3163,1.3775,1.3289,1.5654; For example, if it is 400.5 that observed temperature between two temperatures, is surveyed flue-gas temperature
0c, obtains with linear interpolation method, and circular is:
By following formula, ask dry flue gas mean specific heat
:
3.7) by following formula, ask smoke evacuation enthalpy
, the kJ of unit:
3.8) by following formula, calculate heat loss due to exhaust gas
, the kJ of unit:
4) according to 5 minutes employing cycles, the radiation intensity of 8 radiation intensity sensors of sampling in every 5 minutes
,
the kW/m of unit
2; The measured value of each radiation intensity sensor has represented the radiation intensity of the face of cylinder part of its representative, because be to be evenly arranged on right cylinder, so each radiation sensor represents that right cylinder side surface area is:
Measurement based on radiation intensity, can calculate the radiation heat loss who starts up till now from measuring
, the kJ of unit:
Wherein:
represent the sampling period, the sampling period is 5 minutes;
for from starting the total sampling number to current time;
5) according to 5 minutes sampling periods, every 5 minutes sampling burner place upside measuring point temperature
, unit
0c, actual measurement burner place upside measuring point temperature
, unit
0c; Measure in advance burner thickness H, burner coefficient of heat conductivity
(w/cm.k), burner external diameter r1(m), and be input to computing machine by keyboard; Heat conduction loss
be calculated as follows:
。
Claims (4)
1. a gas kitchen ranges thermal equilibrium proving installation, comprise display (1), computing machine (2), PLC controller (3), flue gas analyzer (5), multi channel signals transducer (6), combustion gas wet flow indicator (8), solenoid valve (9), radiation intensity sensor (10), burner lower end temperature sensor (11), burner upper end temperature sensor (12), cooling-water temperature sensor (13), flue-gas temperature sensor (14), tested kitchen range (15), smoke collecting device (17), kettle (18) is filled with water, environment temperature sensor (20) and radiation intensity sensor stand (26), it is characterized in that: described environment temperature sensor (20) is arranged in the environment of kettle (18) place, flue-gas temperature sensor (14) is arranged on smoke collecting device (17), smoke collecting device (17) is arranged on kettle (18) bottom flue gas circulation place, cooling-water temperature sensor (13) is fixed on that kettle (18) covers face and its probe inserts in water, radiation intensity sensor (10) is arranged on kettle (18) below on flame annular stent around, burner upper end temperature sensor (12) is arranged on kitchen range (15) upper end, burner lower end temperature sensor (11) is arranged on kitchen range (15) bottom surface, the output terminal of listed environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is connected to computing machine (2) through a multi channel signals transducer (6), described computing machine (2) connects display (1) and PLC controller (3), PLC controller (3) connected electromagnetic valve (9) and combustion gas wet flow indicator (8), the signal of described environment temperature sensor (20), flue-gas temperature sensor (14), cooling-water temperature sensor (13), radiation intensity sensor (10), burner upper end temperature sensor (12), burner lower end temperature sensor (11) is delivered to multi channel signals transducer (6), and multi channel signals transducer (6) is converted into digital signal and is sent to computing machine (2) and calculates, smoke collecting device (17) is measured CO in flue gas through fume component analysis instrument (5) after gathering flue gas
2, N
2, O
2, CO, H
2the composition of O, is sent to computing machine (2) and calculates, computing machine (2) is controlled solenoid valve (9) through PLC controller (3).
2. gas kitchen ranges thermal equilibrium proving installation according to claim 1, is characterized in that described cooling-water temperature sensor (13) adopts thermal resistance Pt100; Described radiation intensity sensor (10) adopts RHFS30; Described burner upper end temperature sensor (12) and burner lower end temperature sensor (11) adopt Pt100; Described environment temperature sensor (20) adopts Pt100; Described flue-gas temperature sensor (41) adopts Pt100; Described multi channel signals transducer (6) adopts SQ2040; Described PLC controller (3) adopts the prompt XC3 series of PLC of letter; Described flue gas analyzer (5) adopts the reinforced flue gas analyzer of Siemens testo350.
3. a gas kitchen ranges thermal equilibrium method of testing, adopts gas kitchen ranges thermal equilibrium proving installation according to claim 1 to test, and concrete operation steps is as follows:
1) add the water of set amount:
To be filled with water and add the water of set amount in kettle (18), record add the quality of water, and be input in computing machine (2); The kettle (18) that will be filled with water is placed on measured kitchen range (15);
2) import parameter:
From keyboard input specific heat of water value, the quality of water in kettle; Low heat value from keyboard input combustion gas; From keyboard, the result of Gas Components is input to computing machine (2); Specifically comprise: m value and n value in combustion gas CmHn component; From keyboard, input burner thickness, burner external diameter, burner coefficient of heat conductivity information; Data importing in mean specific heat in mean specific heat calculating table is arrived in computing machine (2); Light kitchen range:
Light after kitchen range (15), computing machine (2) says the word according to setting PLC controller;
4) thermal equilibrium is measured:
1. measure and consume combustion gas total amount of heat;
2. measure and effectively absorb heat;
3. measure flue gas thermal loss;
4. measuring radiation thermal loss;
5. measure conductive heat loss;
According to collection period 5 minutes, within every five minutes, repeat above-mentioned steps 2)-4) once, until user feels to obtain result stably.
4. gas kitchen ranges thermal equilibrium method of testing according to claim 3, is characterized in that calculating thermal equilibrium according to following computing method;
4.1) according to the sampling time of 5 minutes, within every 5 minutes, measure gas flow, and by the consumption combustion gas volume of measuring
, the m of unit
3, and the low heat value of combustion gas
, unit: MJ/m
3, estimate in real time the total amount of heat that combustion gas discharges
, unit: kJ; Its computing method are:
4.2) according to the sampling time of 5 minutes, within every 5 minutes, measure the water temperature in kettle, and with prefiring initial water temperature comparison, obtain the real-time temperature difference
, unit ℃; Utilize the quality m of water in pot, units/kg, specific heat of water
, the kJ/ of unit (kg. ℃), estimates effectively caloric receptivity in real time
, the kJ of unit; Wherein, in pot, quality and the specific heat of water of water arranged by keyboard; The computing method of asking for effective caloric receptivity are:
4.3) according to following steps, measure flue gas thermal loss:
1), according to the sampling time of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to the combustion gas of setting
in component
value and
value, calculates and obtains theoretical air requirement by following formula
, the m of unit
3; Computing formula is as follows:
2) according to the sampling time of 5 minutes, every 5 minutes measures ambient temperature
, and the theoretical air requirement obtaining according to step 1)
, calculate and obtain theoretical air enthalpy
, the kJ of unit; Computing formula is as follows:
3), according to the sampling period of 5 minutes, within every 5 minutes, measure that fume component analysis instrument measures
,
,
composition, unit is %, is designated as respectively
,
,
;
Calculate thus excess air coefficient
; Computing formula is:
4), according to the sampling period of 5 minutes, within every 5 minutes, measure and consume combustion gas volume
, unit: m
3, and according to combustion gas
component
value and
value, obtains in flue gas
with
volume
,
volume
,
volume
, unit: m
3; Its computing formula is:
In flue gas
with
volume
computing formula be:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
In flue gas
volume
, unit: m
3, its computing formula is:
Obtain actual dry flue gas amount
and exhaust gas volumn
, unit: m
3, its computing formula is:
Obtain actual dry flue gas amount
computing formula:
Obtain exhaust gas volumn
count calculation formula:
6), according to 5 minute sampling period, within every 5 minutes, measure flue-gas temperature
, unit ℃; Looking into table 1 mean specific heat in accompanying drawing, with showing, obtains in flue gas
,
,
,
,
mean specific heat
,
,
,
,
, the kJ/ of unit (kg. ℃); By following formula, ask dry flue gas mean specific heat
:
7) by following formula, ask smoke evacuation enthalpy
, the kJ of unit:
8) by following formula, calculate heat loss due to exhaust gas
, the kJ of unit:
4.4) according to 5 minutes employing cycles, the radiation intensity of 8 radiation intensity sensors of sampling in every 5 minutes
,
the kW/m of unit
2; The measured value of each radiation intensity sensor has represented the radiation intensity of the face of cylinder part of its representative, because be to be evenly arranged on right cylinder, so each radiation sensor represents that right cylinder side surface area is:
Measurement based on radiation intensity, can calculate the radiation heat loss who starts up till now from measuring
, the kJ of unit:
Wherein:
represent the sampling period, the sampling period is 5 minutes;
for from starting the total sampling number to current time;
4.5) according to 5 minutes sampling periods, every 5 minutes sampling burner place upside measuring point temperature
, unit
0c, actual measurement burner place upside measuring point temperature
, unit
0c; Measure in advance burner thickness H, burner coefficient of heat conductivity
(w/cm.k), burner external diameter r1(m), and be input to computing machine by keyboard; Heat conduction loss
be calculated as follows:
。
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| CN108716955A (en) * | 2018-04-09 | 2018-10-30 | 佛山市川东磁电股份有限公司 | A kind of gas-cooker temperature measuring equipment |
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