CN216622245U - Flue gas humidity on-line measuring system applied to thermal power plant - Google Patents
Flue gas humidity on-line measuring system applied to thermal power plant Download PDFInfo
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- CN216622245U CN216622245U CN202122515362.2U CN202122515362U CN216622245U CN 216622245 U CN216622245 U CN 216622245U CN 202122515362 U CN202122515362 U CN 202122515362U CN 216622245 U CN216622245 U CN 216622245U
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Abstract
The utility model provides a flue gas humidity online measurement system applied to a thermal power plant. The device comprises an air pump, an air suction pipeline, a resistance-capacitance type humidity sensor, a PLC (programmable logic controller) control panel and an upper computer, and further comprises a purging mechanism, wherein the air pump is connected with a smoke outlet through the air suction pipeline, the resistance-capacitance type humidity sensor is arranged on the air suction pipeline, a first electromagnetic valve is arranged between the resistance-capacitance type humidity sensor and the smoke outlet pipeline, the resistance-capacitance type humidity sensor and the first electromagnetic valve are connected with the PLC control panel, the PLC control panel is connected with the upper computer, the upper computer is connected with the purging mechanism, the first electromagnetic valve is arranged on the air suction pipeline, close to the smoke outlet side, of the resistance-capacitance type humidity sensor, and a purging air outlet is arranged on the air suction pipeline between the resistance-capacitance type humidity sensor and the air pump. The utility model can ensure the cleanliness and reduce the loss of the device by purging the sampling device in the non-sampling period.
Description
Technical Field
The utility model belongs to the field of flue gas humidity measurement in the power industry, and particularly relates to a flue gas humidity online measurement system applied to a thermal power plant.
Background
Flue gas humidity refers to the ratio of the volume of water vapor in a volume of exhaust gas to the volume of exhaust gas under standard conditions. The high-temperature flue gas generally refers to gas generated in coal-fired power generation engineering in the thermal power industry, is used as a special medium, has a general temperature range of 40-150 ℃, can reach 160 ℃ under special conditions, and generally contains dust and acidic substances such as SO in the flue gas2、NOXAnd the problem that how to ensure the on-line measurement of the humidity of the flue gas by overcoming high temperature, high dust and acidic substances is very difficult. Common humidity measurement methods are: condensation, wet and dry bulb, weighing, dew point and electronic sensors. At present, flue gas humidity of a thermal power plant is mostly measured in an in-situ mode, the flue gas humidity is expensive, is seriously worn by dust adhesion and acidic substances, and cannot be accurately, reliably and long-term measured.
SUMMERY OF THE UTILITY MODEL
According to the technical problem provided by the utility model, the flue gas humidity online measuring system applied to the thermal power plant is provided. The technical means adopted by the utility model are as follows:
the utility model provides a be applied to flue gas humidity on-line measuring system of thermal power plant, includes aspiration pump, aspiration line, resistance-capacitance type humidity transducer, PLC control panel and host computer, still includes and sweeps the mechanism, the aspiration pump links to each other with the exhanst gas outlet through the aspiration line, resistance-capacitance type humidity transducer sets up on the aspiration line, be equipped with first solenoid valve between resistance-capacitance type humidity transducer and the exhanst gas outlet pipeline, resistance-capacitance type humidity transducer, first solenoid valve link to each other with the PLC control panel, the PLC control panel links to each other with the host computer, the host computer links to each other with sweeping the mechanism, resistance-capacitance type humidity transducer is equipped with first solenoid valve on being close to the aspiration line of flue gas outlet side, be equipped with the sweep gas outlet on the aspiration line between resistance-capacitance type humidity transducer and the aspiration pump.
Further, the purging mechanism comprises a compressed air source, a second electromagnetic valve and a gas transmission pipeline, and the second electromagnetic valve is connected with the PLC control panel.
Furthermore, a third electromagnetic valve is arranged on the air outlet pipeline where the purge air outlet is located.
Furthermore, a sample outlet is arranged on an air pumping pipeline between the resistance-capacitance humidity sensor and the air pumping pump.
Furthermore, a filter screen is arranged between the resistance-capacitance type humidity sensor and the air suction pump.
The smoke humidity sampling device is simple and reasonable in structure arrangement, the cleanliness of the sampling device is guaranteed by purging the sampling device in a non-sampling period, the loss of the device can be reduced, the service life of the smoke humidity sampling device is effectively prolonged, and the cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a system diagram of the present invention.
In the figure: 1. a flue gas outlet; 2. an air extraction pipeline; 3. an air pump; 4. a resistive-capacitive humidity sensor; 5. a first solenoid valve; 6. a compressed air source; 7. a second solenoid valve; 8. a third electromagnetic valve; 9. and (4) a filter screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment discloses an online measurement system for flue gas humidity applied to a thermal power plant, which includes an air pump, an air pumping pipeline, a capacitance-resistance type humidity sensor, a PLC control panel, an upper computer, and a purging mechanism, wherein the air pump 3 is connected to a flue gas outlet 1 through the air pumping pipeline 2 (according to actual use requirements, the air pump may be fixedly connected to a branch extending from the flue gas outlet, or may be portable, and the air pumping pipeline is butted at the flue gas outlet), the capacitance-resistance type humidity sensor 4 is disposed on the air pumping pipeline 2, a first electromagnetic valve 5 is disposed on the air pumping pipeline of the capacitance-resistance type humidity sensor near the flue gas outlet, the capacitance-resistance type humidity sensor, the first electromagnetic valve and the PLC control panel are electrically connected, the PLC control panel is electrically connected to the upper computer, and the purging mechanism is electrically connected to the upper computer, the output end of the purging mechanism is connected to an air exhaust pipeline between the first electromagnetic valve and the resistance-capacitance type humidity sensor, a purging air outlet is formed in the air exhaust pipeline 2 between the resistance-capacitance type humidity sensor 4 and the air exhaust pump 3, and in the embodiment, the upper computer is a microcomputer of industrial control pre-installed software.
Several measurement methods currently required by national regulations are: the dry and wet ball method, the gravimetric method and the condensation method have the disadvantages of large measurement error, long measurement time, more and complicated measurement equipment for gravimetric method measurement, long analysis time and more and complicated measurement equipment for condensation method. The capacitance-resistance moisture content detection method adopted in this embodiment is a device that converts a resistance value or a capacitance value into a measurable electric quantity according to a quantitative relationship between moisture in a sample and the resistance value and the capacitance value, and obtains a moisture value in the measured sample by measuring the electric quantity. In this embodiment, the rc humidity sensor is implemented by using the prior art.
Specifically, the purging mechanism comprises a compressed air source 6, a second electromagnetic valve 7 and a gas transmission pipeline, the second electromagnetic valve is connected with the PLC control panel, and an outlet of the gas transmission pipeline is connected to the air exhaust pipeline.
In a preferred embodiment, a third electromagnetic valve 8 is arranged on a purge gas outlet pipeline where the purge gas outlet is located. In a preferred embodiment, a sample outlet is provided on the air pumping pipeline between the rc humidity sensor and the air pump, and a sampling valve is provided thereon.
In order to prevent dust from entering the device and prolong the service life of the instrument, as a preferred embodiment, a filter screen 9 is arranged between the resistance-capacitance humidity sensor and the air pump or at the inlet of the air pumping pipeline, and the filter screen is made of nylon materials.
The specific implementation method of the embodiment is as follows: utilize the aspiration pump to carry out the flue gas extraction, measure gained numerical value and transmit to the host computer through PLC and carry out on-line monitoring, under the condition that needs, PLC sends regularly and sweeps the order, purifies to the sampling device and sweeps, and online real-time measurement's humidity numerical value carries out current numerical value and keeps during sweeping, avoids arousing that measurement numerical value is undulant. When adopting fixedly, under the condition that need not sample, the accessible closes first solenoid valve, prevents that the flue gas from getting into, can carry out intraductal sweeping through opening second solenoid valve and third solenoid valve this moment. If the sampling is required to be collected, the purging device, the second electromagnetic valve and the third electromagnetic valve need to be closed, and the sampling valve is opened to finish the sampling; or, the third electromagnetic valve is used as a sampling valve to finish sampling.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a be applied to flue gas humidity on-line measuring system of thermal power plant, its characterized in that, includes aspiration pump, aspiration line, resistance-capacitance type humidity transducer, PLC control panel and host computer, still including sweeping the mechanism, the aspiration pump passes through the aspiration line and links to each other with the exhanst gas outlet, resistance-capacitance type humidity transducer sets up on the aspiration line, be equipped with first solenoid valve between resistance-capacitance type humidity transducer and the exhanst gas outlet pipeline, resistance-capacitance type humidity transducer, first solenoid valve link to each other with the PLC control panel, the PLC control panel links to each other with the host computer, the host computer links to each other with sweeping the mechanism, resistance-capacitance type humidity transducer is equipped with first solenoid valve on being close to the aspiration line of flue gas outlet side, be equipped with on the aspiration line between resistance-capacitance type humidity transducer and the aspiration pump and blow the scavenging gas outlet.
2. The system for measuring the flue gas humidity in the thermal power plant as claimed in claim 1, wherein the purging mechanism comprises a compressed air source, a second electromagnetic valve and a gas transmission pipeline, and the second electromagnetic valve is connected with the PLC control panel.
3. The system for measuring the humidity of the flue gas applied to the thermal power plant according to claim 1 or 2, wherein a third electromagnetic valve is arranged on a gas outlet pipeline where the gas outlet of the purge gas is located.
4. The system for measuring the flue gas humidity in the thermal power plant according to claim 1, wherein a sample outlet is arranged on an air pumping pipeline between the resistance-capacitance humidity sensor and the air pump.
5. The system for measuring the flue gas humidity in the thermal power plant according to claim 1, wherein a filter screen is arranged between the resistance-capacitance humidity sensor and the air pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122515362.2U CN216622245U (en) | 2021-10-19 | 2021-10-19 | Flue gas humidity on-line measuring system applied to thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122515362.2U CN216622245U (en) | 2021-10-19 | 2021-10-19 | Flue gas humidity on-line measuring system applied to thermal power plant |
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| CN216622245U true CN216622245U (en) | 2022-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124998A (en) * | 2023-01-05 | 2023-05-16 | 天津华能杨柳青热电有限责任公司 | Method for measuring and calculating moisture content of wet desulfurization clean flue gas |
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2021
- 2021-10-19 CN CN202122515362.2U patent/CN216622245U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124998A (en) * | 2023-01-05 | 2023-05-16 | 天津华能杨柳青热电有限责任公司 | Method for measuring and calculating moisture content of wet desulfurization clean flue gas |
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