CN203216732U - Thermal efficiency real-time monitoring system of condensing gas-fired boiler - Google Patents
Thermal efficiency real-time monitoring system of condensing gas-fired boiler Download PDFInfo
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- CN203216732U CN203216732U CN 201320060074 CN201320060074U CN203216732U CN 203216732 U CN203216732 U CN 203216732U CN 201320060074 CN201320060074 CN 201320060074 CN 201320060074 U CN201320060074 U CN 201320060074U CN 203216732 U CN203216732 U CN 203216732U
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Abstract
The utility model discloses a thermal efficiency real-time monitoring system of a condensing gas-fired boiler with a condensing economizer; the thermal efficiency real-time monitoring system comprises a signal acquisition system and a PLC control cabinet; and the PLC control cabinet is used for receiving signals from the signal acquisition system and carrying out thermal efficiency calculating and display. The thermal efficiency real-time monitoring system of the condensing gas-fired boiler employs the signal acquisition system to collect signals from each monitoring position of the condensing gas-fired boiler; the PLC control cabinet receives the signals from the signal acquisition system, carries out data processing and calculation, so various parameters and thermal efficiency data in real-time operation of the condensing gas-fired boiler can be directly displayed on a display of the PLC control cabinet; and abnormity conditions can be timely adjusted to ensure high efficiency operation of the condensing gas-fired boiler.
Description
Technical field
The utility model relates to the boiler thermal output thermal testing, relates in particular to the real-time monitoring of the condensation gas boiler thermal efficiency, and it belongs to the boiler technology field.
Background technology
The thermal efficiency of boiler refers to the shared percentage of net heat in the heat that fuel sends into.It is the important technology economic target of boiler, and the height of boiler thermal output will directly influence the operating cost of boiler, has also reflected the energy resource consumption level of enterprise's thermal powerplant.
The American-European countries's application of condensing energy-saving appliance technology on boiler that begin one's study eighties in last century, the domestic application that also just just begins one's study in recent years.The thermal efficiency of boiler can directly be tested, calculate to general conventional boiler by positive balance method and counter balancing method.And condenser boiler is to have installed a condensing energy-saving appliance additional at the conventional boiler back-end ductwork, the contained latent heat of vaporization (general conventional energy-saving appliance only utilizes the waste heat of flue gas) of water vapour in the flue gas of absorption boiler emission, especially the content for water vapour in the gas fired-boiler flue gas is very high, and absorbing the raising of boiler thermal output of its latent heat of vaporization is very obvious.Normally adopt water at low temperature to absorb this latent heat of vaporization, absorb laggard oxygen-eliminating device.Therefore, should add the latent heat of vaporization that this part absorbs in the net heat when calculating the condenser boiler thermal efficiency.Calculate by net calorific value, the condensation gas boiler thermal efficiency can meet or exceed more than 100% (can reach 110%) in theory.
Under the national policy of current energy-saving and emission-reduction, actively promote condensation gas boiler, improve boiler thermal output, and keep the high efficiency boiler operation, reduce energy cost, reduce pollutant emission, realize that the real-time monitoring of condensation gas boiler is particularly important.By real-time monitoring, in time understand the thermal efficiency of boiler operatiopn, in time adjust operating condition, guarantee the operation of high efficiency boiler rate.
At present, the real-time monitoring of boiler thermal output is mostly at traditional coal-burning boiler design, monitoring to conventional fuel oil (gas) boiler is also arranged, and test at the condenser boiler thermal efficiency, having only application number is that 200410026206.8 patent of invention discloses fuel oil condenser boiler counter-balance thermal efficiency measuring method, this invention has then provided a kind of measuring method of fuel oil condenser boiler counter-balance thermal efficiency, this measuring method has been set up the anti-EQUILIBRIUM CALCULATION FOR PROCESS measuring method of the fuel oil condenser boiler thermal efficiency based on the high-order calorific capacity of fuel from the angle of quality and energy conservation.This invention is a kind of calculating measuring method, neither at the combustion gas condenser boiler, also do not realize monitoring in real time.
The utility model content
The condensation gas boiler thermal efficiency described in the utility model is monitored in real time, can be implemented in the real-time monitoring with the condensation gas boiler thermal efficiency, in time understand the dynamic thermal efficiency of boiler operatiopn, in time adjust the boiler operatiopn operating mode, guarantee high efficiency boiler stable operation, reduce energy dissipation.
A kind of thermal efficiency real-time monitoring system of condensation gas boiler, described condensation gas boiler has the condensing energy-saving appliance, it is characterized in that, described thermal efficiency real-time monitoring system comprises signal acquiring system, and be used for reception from the signal of described signal acquiring system, and the PLC switch board that carries out Efficiency Calculation and demonstration;
Described signal acquiring system comprises:
Be installed in the Boiler Steam flowmeter on the main steam line of condensation gas boiler;
Be installed in the natural gas flowmeter on the natural-gas transfer pipeline;
Be installed in flow of inlet water meter and inflow temperature sensor on the inlet channel of condensing energy-saving appliance;
Be installed in the leaving water temperature sensor on the outlet conduit of condensing energy-saving appliance.
The Boiler Steam flowmeter is used for gathering the evaporation capacity of condensation gas boiler in this monitoring system, the natural gas flowmeter collection enters the gas quantity of condensation gas boiler, inflow temperature sensor and leaving water temperature sensor are used for gathering water inlet or the leaving water temperature of condensing energy-saving appliance, the flow of inlet water meter is used for gathering the inflow of condensing energy-saving appliance, described PLC switch board receives the information of above-mentioned each flowmeter or sensor, the line data of going forward side by side is handled and is calculated, and shows all kinds of parameters of condensation gas boiler real time execution and the thermal efficiency data that calculate.
Be the water yield and water temperature that monitoring in real time enters condensation gas boiler, as preferably, described signal acquiring system also comprises: be installed in feed meter and temperature sensor on the feedwater piping of described condensation gas boiler.
It is the shared percentage of net heat in the heat sent into of fuel that the positive balance of the condensation gas boiler thermal efficiency is calculated, anti-EQUILIBRIUM CALCULATION FOR PROCESS then is every thermal loss that gross energy deducts boiler, and these Calculation of Heat loss need be according to the situation at condensation gas boiler scene, also relevant with the one-tenth of the flue-gas temperature of boiler emission, the flue gas factor of grading.
Therefore, as preferably, described signal acquiring system also comprises the scene temperature sensor that is arranged under the described condensation gas boiler environment of living in, gathers the environment temperature at scene, boiler room.
Described signal acquiring system also comprises the flue-gas temperature sensor on the flue that is installed in described condensing energy-saving appliance back, is used for gathering the discharged flue gas temperature.
Described signal acquiring system also comprises the flue gas on-line analysis instrument, and the probe of described flue gas on-line analysis instrument is on the described connection flue.Be used for accurately gathering the composition of discharging flue gas, as O
2, CO, RO
2Deng, and the content of each composition of Accurate Analysis, can calculate heat loss due to exhaust gas by gas quantity, smoke components content, exhaust gas temperature and environment temperature etc.
Above signal acquiring system is with each operational factor of the condensation gas boiler that collects, be transported to the PLC switch board, as preferably, described PLC switch board is provided with display device, be used for showing the signal from described signal acquiring system, and be used for showing the thermal efficiency.Handle and calculate by above-mentioned signals collecting, data, just can on display, show all kinds of parameters and the thermal efficiency data of condensation gas boiler real time execution intuitively, abnormal conditions are in time adjusted, guarantee the condensation gas boiler high-efficiency operation.
Utilize the method for the above-mentioned real-time monitoring system detection condensation gas boiler thermal efficiency as follows:
(1) described PLC switch board receives the signal from signal acquiring system;
(2) the PLC switch board carries out Efficiency Calculation and demonstration according to the signal that receives;
The positive balance thermal efficiency N of condensation gas boiler
1The formula that is calculated as follows:
N
1＝(Q
1+Q
0)/Q
r
Wherein, Q
1=boiler capacity * (setting the saturated vapour enthalpy-feedwater enthalpy under the working pressure)
Q
0The latent heat of vaporization that discharges behind the water vapor condensation in the flue gas that reclaims for the condensing energy-saving appliance is by Inlet and outlet water temperature and the flow rate calculation of condensing energy-saving appliance: Q
0=flow of inlet water * Inlet and outlet water the temperature difference;
Q
rBe the heat that fuel is sent into, Q
r=the rock gas net calorific value of the gas quantity of condensation gas boiler * provide according to local municipal administration is provided.
Utilize the utility model device to detect the condensation gas boiler counter-balance thermal efficiency, comprise the steps:
(1) described PLC switch board receives the signal from signal acquiring system;
(2) carry out Efficiency Calculation and demonstration according to the signal that collects;
The counter-balance thermal efficiency N of condensation gas boiler
2The formula that is calculated as follows:
N
2＝100％-q
2-q
3-q
4-q
5-q
6+q
0；
Wherein, q
2Be heat loss due to exhaust gas;
q
3For gas is not finished combustion heat loss;
q
4Be the incomplete thermal loss of machinery;
q
5Be radiation loss;
q
6Be the heat loss due to sensible heat in slag;
q
0Be the calorific value that the condensing energy-saving appliance reclaims, the latent heat of vaporization that discharges behind the water vapor condensation in the flue gas.
Wherein, q
2Can calculate by gas quantity, smoke components content, exhaust gas temperature and environment temperature etc.;
q
3Then be to obtain according to CO cubage in the smoke components;
q
4For the incomplete thermal loss of machinery, be almost 0 for gas fired-boiler;
q
5For the good boiler of furnace insulation, this can be constant basically, by calculating the body of heater area, according to furnace body temperature and environment temperature, calculates fixing q
5
q
6Be almost 0 for gas fired-boiler;
q
0Calculate q according to positive balance
0=100% * Q
0/ Q
r
The utility model arranges the Boiler Steam flowmeter by the relevant position at condensation gas boiler, natural gas flowmeter, the flow of inlet water meter of condensing energy-saving appliance, inflow temperature sensor and leaving water temperature sensor, and the feed meter of condensation gas boiler and temperature sensor collection condensation gas boiler real time execution parameter, the situation of flue gas on-line analysis instrument and flue-gas temperature sensor collection flue gas that condensation gas boiler discharges is set at flue, by above-mentioned signals collecting, data are handled and are calculated, just can be intuitively show all kinds of parameters of condensation gas boiler real time execution and just at the display of PLC switch board, the counter-balance thermal efficiency data, abnormal conditions are in time adjusted the boiler operatiopn operating mode, guarantee the condensation gas boiler high-efficiency operation.
Description of drawings
Fig. 1 is the structural representation of the thermal efficiency real-time monitoring system of the utility model condensation gas boiler.
Embodiment
Fig. 1 shows the structural drawing of the thermal efficiency real-time monitoring system of the utility model condensation gas boiler, as can be seen from Figure, condensation gas boiler 19 has condensing energy-saving appliance 14, this thermal efficiency real-time monitoring system comprises signal acquiring system, and be used for reception from the signal of signal acquiring system, and the PLC switch board 18 that carries out Efficiency Calculation and demonstration;
Signal acquiring system comprises as the lower part:
Be installed in the Boiler Steam flowmeter 5 on the main steam line 4 of condensation gas boiler 19;
Be installed in the natural gas flowmeter 2 on the natural-gas transfer pipeline 1;
Be installed in flow of inlet water meter 16 and inflow temperature sensor 17 on the inlet channel 15 of condensing energy-saving appliance 14;
Be installed in the leaving water temperature sensor 9 on the outlet conduit 10 of condensing energy-saving appliance 14;
PLC switch board 18 is provided with display device, is used for showing the signal from described signal acquiring system, and is used for showing the thermal efficiency.
As can be seen from Figure, feed meter 7 and temperature sensor 8 also are installed on the feedwater piping 6 of condensation gas boiler 19.
Boiler Steam flow 5 in this thermal efficiency real-time monitoring system is used for gathering the evaporation capacity of condensation gas boiler, gas discharge 2 is gathered the gas quantity that enters condensation gas boiler, inflow temperature sensor 17 and leaving water temperature sensor 9 are used for gathering water inlet or the leaving water temperature of condensing energy-saving appliance 14, and flow of inlet water meter 16 is used for gathering the inflow of condensing energy-saving appliance 14.
Carry out anti-EQUILIBRIUM CALCULATION FOR PROCESS for ease of the thermal efficiency to condensation gas boiler, this signal acquiring system also comprises the scene temperature sensor 3 that is arranged under condensation gas boiler 19 environment of living in; Be installed in the flue-gas temperature sensor 13 on the flue of condensing energy-saving appliance 14 back.
This signal acquiring system also comprises flue gas on-line analysis instrument 12, and the probe of this flue gas on-line analysis instrument 12 is on the connection flue 11 between condensation gas boiler 19 and the condensing energy-saving appliance 14.
In the said apparatus, signal acquiring system is gathered the signal that condensation gas boiler is respectively monitored the position, the PLC switch board receives the signal from signal acquiring system, and through data processing and calculating, all kinds of parameters and the thermal efficiency data that just can show the condensation gas boiler real time execution intuitively at the display of PLC switch board, abnormal conditions are in time adjusted, guaranteed the condensation gas boiler high-efficiency operation.
It is exactly the shared percentage of net heat in the heat sent into of fuel that the positive balance of the condensation gas boiler thermal efficiency is calculated:
N
1＝(Q
1+Q
0)/Qr
Net heat for condensation gas boiler divides two parts, a part of net heat Q
1Be boiler capacity * (setting the saturated vapour enthalpy-feedwater enthalpy under the working pressure), another part net heat Q
0Then be the latent heat of vaporization that discharges behind the water vapor condensation in the flue gas that reclaims of condensing energy-saving appliance, it can be by Inlet and outlet water temperature and the flow rate calculation of condensing energy-saving appliance, Q
0=flow of inlet water * Inlet and outlet water the temperature difference.
The rock gas net calorific value of the gas quantity that heat Qr=that fuel is sent into gathers * provide according to local municipal administration.
The anti-balance of the condensation gas boiler thermal efficiency then is the every thermal loss according to boiler, calculates by following formula:
N
2＝100％-q
2-q
3-q
4-q
5-q
6+q
0
Wherein, q
2Be heat loss due to exhaust gas, calculate by gas quantity, smoke components content, exhaust gas temperature and environment temperature etc.;
q
3Not finishing combustion heat loss for gas, then is to obtain according to CO cubage in the smoke components;
q
4For the incomplete thermal loss of machinery, for gas fired-boiler, this loss is almost 0;
q
5Be radiation loss, for the good boiler of furnace insulation, this can be constant basically, by calculating the body of heater area, according to furnace body temperature and environment temperature, calculates fixing q
5
q
6Be the heat loss due to sensible heat in slag, for gas fired-boiler, this loss is almost 0;
q
0Calculate q according to positive balance
0=100% * Q
0/ Q
r
As certain 20t/h of enterprise condensation gas boiler:
The rock gas net calorific value Q that local municipal administration provides
NetBe 37228kJ/m
3,
The boiler amount of natural gas records 1175m
3/ h,
Condensing energy-saving appliance inflow temperature records 22 ℃,
Condensing energy-saving appliance leaving water temperature records 59 ℃,
Condensing energy-saving appliance flow of inlet water records 10000kg/h,
Boiler feed temperature records 102 ℃,
Boiler feedwater flow records 18800kg/h,
Boiler capacity records 18300kg/h,
It is 1.2MPa that boiler is set working pressure,
Environment temperature records 27 ℃,
RO in the flue gas
2Content records 10.94%,
O in the flue gas
2Content records 1.74%,
CO content in smoke records 0.0011%,
Exhaust gas temperature records 90 ℃,
Heat loss due to exhaust gas calculates 1.4%,
The imperfect combustion heat waste of gas calculates 0%,
Radiation loss is calculated and tabled look-up is 0.3%,
Positive balance efficiency N
1Calculate 103%,
Anti-balance efficiency N
2Calculate 101.1%.
Claims (6)
1. the thermal efficiency real-time monitoring system of a condensation gas boiler, described condensation gas boiler (19) has condensing energy-saving appliance (14), it is characterized in that, described thermal efficiency real-time monitoring system comprises signal acquiring system, and be used for reception from the signal of described signal acquiring system, and the PLC switch board (18) that carries out Efficiency Calculation and demonstration;
Described signal acquiring system comprises:
Be installed in the Boiler Steam flowmeter (5) on the main steam line (4) of condensation gas boiler (19);
Be installed in the natural gas flowmeter (2) on the natural-gas transfer pipeline (1);
Be installed in flow of inlet water meter (16) and inflow temperature sensor (17) on the inlet channel (15) of condensing energy-saving appliance (14);
Be installed in the leaving water temperature sensor (9) on the outlet conduit (10) of condensing energy-saving appliance (14).
2. the thermal efficiency real-time monitoring system of condensation gas boiler according to claim 1 is characterized in that, described signal acquiring system also comprises:
Be installed in feed meter (7) and temperature sensor (8) on the feedwater piping (6) of described condensation gas boiler (19).
3. the thermal efficiency real-time monitoring system of condensation gas boiler according to claim 1 is characterized in that, described signal acquiring system also comprises the scene temperature sensor (3) that is arranged under described condensation gas boiler (19) environment of living in.
4. the thermal efficiency real-time monitoring system of condensation gas boiler according to claim 3 is characterized in that, described signal acquiring system also comprises the flue-gas temperature sensor (13) that is installed on the flue of described condensing energy-saving appliance (14) back.
5. the thermal efficiency real-time monitoring system of condensation gas boiler according to claim 4, it is characterized in that, described signal acquiring system also comprises flue gas on-line analysis instrument (12), and the probe of described flue gas on-line analysis instrument (12) is in and connects on the flue (11).
6. according to the thermal efficiency real-time monitoring system of each described condensation gas boiler of claim 1～5, it is characterized in that, described PLC switch board (18) is provided with display device, is used for showing the signal from described signal acquiring system, and is used for showing the thermal efficiency.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149043A (en) * | 2013-01-30 | 2013-06-12 | 浙江中烟工业有限责任公司 | Real-time monitoring system and monitoring method of heat efficiency of condensing gas boiler |
| CN104267710A (en) * | 2014-10-20 | 2015-01-07 | 江苏海事职业技术学院 | Blast-furnace gas boiler economizer boiling degree on-line monitoring device and method |
| CN108387386A (en) * | 2018-02-06 | 2018-08-10 | 广东省中山市质量计量监督检测所 | A kind of gas cooker thermal efficiency detection water flow test pot |
-
2013
- 2013-01-30 CN CN 201320060074 patent/CN203216732U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149043A (en) * | 2013-01-30 | 2013-06-12 | 浙江中烟工业有限责任公司 | Real-time monitoring system and monitoring method of heat efficiency of condensing gas boiler |
| CN104267710A (en) * | 2014-10-20 | 2015-01-07 | 江苏海事职业技术学院 | Blast-furnace gas boiler economizer boiling degree on-line monitoring device and method |
| CN108387386A (en) * | 2018-02-06 | 2018-08-10 | 广东省中山市质量计量监督检测所 | A kind of gas cooker thermal efficiency detection water flow test pot |
| CN108387386B (en) * | 2018-02-06 | 2024-06-04 | 广东省中山市质量计量监督检测所 | Thermal efficiency detection device of gas cooker |
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| GR01 | Patent grant | ||
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Granted publication date: 20130925 |
|
| CX01 | Expiry of patent term |