Heat tracing automatic switching probe with ceramic coating
By using a ceramic-coated sampling probe and a heating device to maintain the flue gas temperature, the problems of probe corrosion and clogging are solved, thus achieving measurement accuracy and stability and extending the probe's service life.
Patent Information
- Application Number
- CN202423078995.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing probes are easily corroded and worn in flue gas, resulting in inaccurate measurements and short lifespan. They are also prone to clogging at low temperatures, affecting the accuracy of monitoring data and equipment operation.
A ceramic-coated sampling probe is used, equipped with a heating rod and a dilution sampling module to maintain the flue gas temperature above 100℃, prevent moisture condensation, and ensure probe temperature stability by automatically switching heating rods.
It effectively prevents probe corrosion and clogging, improves measurement accuracy and stability, extends probe life, and reduces maintenance costs and the risk of misoperation.
Smart Images
Figure CN223883268U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model provides a kind of heat tracing automatic switching probe with ceramic coating. BACKGROUND
[0002] Coal-fired power plants release flue gas containing various harmful substances during power production. Nitrogen oxides (NOx) are an important pollutant that negatively impacts air quality and human health, such as causing acid rain and photochemical smog. To comply with environmental laws and regulations, such as the Emission Standard of Air Pollutants for Thermal Power Plants, coal-fired power plants must ensure that NOx emissions do not exceed the specified standard, which is typically 100 mg per cubic meter, with some regions requiring even lower emissions.
[0003] To achieve this goal, power plants often use Selective Catalytic Reduction (SCR) technology to reduce NOx emissions. The basic principle of this technology is to use ammonia (NH3) as a reducing agent to react with NOx in flue gas under the action of a specific catalyst, generating harmless nitrogen (N2) and water (H2O). However, when implementing this technology, it is very important to accurately control the amount of ammonia input. If too much ammonia is used, ammonia slip may occur, meaning that unreacted ammonia is emitted into the atmosphere with the flue gas. This is particularly serious in low-temperature environments, as excess ammonia can react with other components in the flue gas to form high-viscosity ammonium bisulfate (NH4HSO4), leading to a series of problems such as catalyst failure, air preheater blockage, and equipment corrosion, which can adversely affect the normal operation of the power generating unit.
[0004] Therefore, it is necessary to monitor and accurately record pollutant emissions during the denitrification process in real time, which helps to ensure that emissions meet regulatory requirements and also allows potential operational problems to be identified and addressed in a timely manner, ensuring efficient and environmentally friendly operation of the power plant.
[0005] When a thermal power unit is in operation, the flue gas it emits contains a large amount of fine dust. During the sampling process, the filter device at the front end of the sampling probe will gradually accumulate these dust and particles. In addition, the flue gas also contains a certain amount of moisture. When the working temperature of the probe drops below 100°C, the moisture in the flue gas will condense into liquid water. In this case, liquid water mixed with accumulated dust can easily cause the probe to become blocked. Once the probe is blocked, it will affect its ability to normally suck flue gas, thereby interfering with the accurate detection of flue gas quality by the equipment, which may ultimately result in monitoring data being biased or abnormal. Therefore, keeping the probe clean and at an appropriate working temperature is crucial to ensuring the reliability and accuracy of the monitoring system.
[0006] In order to ensure the normal work of the probe, the probe heating rod has a service life, and artificial replacement of the heating rod not only increases the workload of personnel, but also needs to train personnel for operation, has the risk of misoperation, and causes system failure.
[0007] The conventional stainless steel material probe is not resistant to corrosion and is easy to be abraded, and is easily corroded in the flue gas environment. The flue gas often contains sulfur dioxide, nitrogen oxides, hydrogen chloride and other acidic gases and moisture, etc. These substances can chemically react with metals, causing the probe surface to rust and corrode, affecting the service life and measurement accuracy of the probe. When the probe is in long-term contact with particulate matter in flue gas, the probe is easy to be abraded. Especially in the case that the flue gas flow is large and the particulate matter concentration is high, the probe surface will be continuously scoured by the particulate matter, causing the shape and size of the probe to change, thereby affecting the accuracy of measurement
[0008] In order to solve the above problems, the utility model provides a probe. Utility model content
[0009] The utility model discloses a kind of probe with ceramic coating for heat tracing automatic switching.
[0010] The utility model discloses the purposes of the probe with ceramic coating for heat tracing automatic switching can be realized by the following technical solutions.
[0011] A kind of probe with ceramic coating for heat tracing automatic switching, by filter element, sampling probe, heating rod one, heating rod two, dilution sampling module, analyzer composition;Filter element is set in the front of sampling probe, and ceramic coating is provided on sampling probe, and heating rod one, heating rod two are set in ceramic coating sampling probe, and dilution sampling module is set to the back side of ceramic coating sampling probe, and analyzer is connected with dilution sampling module.
[0012] Further, the heating rod one is connected with temperature controller one.
[0013] Further, the heating rod two is connected with temperature controller two.
[0014] Preferably, it further includes flange, and the flange is fixed to the outside of sampling probe, and the flange and sampling probe are installed on the denitration flue wall.
[0015] Beneficial technical effects:
[0016] 1. by setting ceramic coating, can effectively resist the scouring and chemical corrosion of particulate matter in flue gas, improve temperature measurement accuracy, increase the service life of sampling probe.
[0017] 2. by setting heating rod one or heating rod two, ensure that there is no liquid water in flue gas, so as to ensure the accuracy and stability of measurement accuracy. DRAWINGS
[0018] The utility model will be further described below with reference to the drawings.
[0019] Figure 1 It is the structure principle schematic diagram of the heat tracing automatic switching probe with ceramic coating.
[0020] The following reference signs are used for identification in the drawings:
[0021] 1, filter core, 2, flange, 3, denitration flue wall, 4, sampling probe, 5, heating rod one, 6, heating rod two, 7, temperature controller one, 8, temperature controller two, 9, dilution sampling module, 10, analyzer. Specific implementation
[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.
[0023] As Figure 1 shown, a heat tracing automatic switching probe with ceramic coating is composed of filter core 1, sampling probe 4, heating rod one 5, heating rod two 6, dilution sampling module 9 and analyzer 10. Filter core 1 is arranged in front of sampling probe 4, ceramic coating is arranged on sampling probe 4, heating rod one 5 and heating rod two 6 are arranged in ceramic coating sampling probe 4, dilution sampling module 9 is arranged at the back of ceramic coating sampling probe 4, and analyzer 10 is connected with dilution sampling module 9.
[0024] By adding ceramic coating to sampling probe 4, ceramic coating has high hardness, high strength, good wear resistance and corrosion resistance, can effectively resist the scouring and chemical corrosion of particulate matters in flue gas, has good heat conductivity, improves temperature measurement accuracy and increases the service life of sampling probe 4.
[0025] Heating rod one 5 is connected with temperature controller one 7, and heating rod two 6 is connected with temperature controller two 8.
[0026] It also includes flange 2, which is fixed to the outside of sampling probe 4. Flange 2 and sampling probe 4 are installed on denitration flue wall 3. Under the suction power of dilution sampling module 9, flue gas passes through filter core 1 in sampling probe 4, is heated by heating rod 5 or heating rod 6, and is controlled by temperature controller one 7 or temperature controller two 8. The temperature of flue gas reaches 135 DEG C, and finally enters analyzer 10 for measurement.
[0027] The heating rod 5 or the heating rod 6 in the sampling probe 4 is heated to ensure that there is no liquid water in the flue gas, thereby ensuring the accuracy and stability of the measurement accuracy of the heating rod 5 or the heating rod 6.
[0028] Temperature judgment is performed by the temperature controller one 7 or the temperature controller two 8, so that the analyzer 10 can automatically switch the probe heating rod without manual operation, thereby prolonging the filter core replacement cycle.
[0029] The utility model discloses in order to ensure the accuracy and stability of flue gas sampling, especially in the case of containing moisture in flue gas, using heat tracing device and dilution sampling is very effective measure. When the temperature of flue gas is kept above 100 DEG C, the moisture in flue gas will exist in gaseous form, which can avoid the problem of the condensation of moisture into liquid and combination with dust and particulate matters in flue gas, causing the blockage of sampling probe. The heat tracing device such as heating rod one 5 and heating rod two 6 maintains the temperature of flue gas, which not only prevents the blockage of probe, but also ensures the stable flow of sample gas, which is crucial for improving the accuracy and reliability of measurement results of analytical instrument.
[0030] Dilution sampling is another effective method, which mixes flue gas with clean dilution gas to reduce the concentration of pollutants in flue gas and the moisture content, further reducing the risk of blockage. This method not only protects the analytical instrument from high-concentration pollutants and moisture, but also provides more stable sample gas flow, which is beneficial to improve the measurement accuracy.
[0031] By using heat tracing device to keep the temperature of flue gas above 100 DEG C and using dilution sampling, the problem of probe blockage caused by moisture and particulate matters in flue gas can be effectively avoided, ensuring the stability of sample gas flow, thereby improving the accuracy and stability of measurement results of analyzer.
[0032] The heating rod one 5 or the heating rod two 6 is switched, and the system automatically monitors the probe temperature data. When an abnormality occurs, the system will automatically switch to the standby heating rod to heat the probe temperature to 135 DEG C, ensuring the probe heat tracing temperature, without manual operation, thereby prolonging the heating rod replacement cycle and reducing the maintenance cost and risk of misoperation.
[0033] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by those skilled in the art.
Claims
1. A heat tracing automatic switching probe with a ceramic coating, characterized in that, The device is composed of a filter, a sampling probe, a heating rod one, a heating rod two, a dilution sampling module and an analyzer; the filter is arranged in front of the sampling probe, the sampling probe is provided with a ceramic coating, the heating rod one and the heating rod two are arranged in the ceramic coating sampling probe, the dilution sampling module is arranged at the back side of the ceramic coating sampling probe, and the analyzer is connected with the dilution sampling module.
2. The heat tracing automatic switching probe with ceramic coating according to claim 1, characterized in that, The heating rod one is connected with a temperature controller one.
3. The heat tracing automatic switching probe with ceramic coating according to claim 2, characterized in that, The heating rod two is connected with a temperature controller two.
4. The heat tracing automatic switching probe with ceramic coating according to claim 3, characterized in that, The device further comprises a flange, which is fixed to the outside of the sampling probe, and the flange and the sampling probe are installed on the denitration flue wall.