CN110763524A - Automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and temperature control method thereof - Google Patents
Automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and temperature control method thereof Download PDFInfo
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- CN110763524A CN110763524A CN201911049050.8A CN201911049050A CN110763524A CN 110763524 A CN110763524 A CN 110763524A CN 201911049050 A CN201911049050 A CN 201911049050A CN 110763524 A CN110763524 A CN 110763524A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
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Abstract
The invention provides an automatic flue gas sampling preprocessor for effective dust removal and dehumidification and a temperature control method thereof, relating to the technical field of continuous online flue gas monitoring. The sampling probe comprises a flange, a metal sintering filter element, a cavity, a heating module and a sample gas outlet. The back-blowing device comprises a back-blowing interface, a two-position three-way electromagnetic valve, an air storage tank and a conical flange port. The sampling pipe is connected with the sampling probe, the flange in the sampling probe is connected with the cavity, the cavity is sleeved outside the metal sintering filter element, and the heating module is sleeved outside the metal sintering filter element. The sampling probe is connected with the sample gas outlet through a gas pipe.
Description
Technical Field
The invention relates to the technical field of continuous online monitoring of flue gas, in particular to an automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and a temperature control method thereof.
Background
When analyzing the content of various pollutants in the flue gas, a proper amount of flue gas needs to be taken out from a flue gas pipeline of a boiler, fuel oil equipment and the like, and then a flue gas analyzer is used for measurement. Because the flue gas contains a plurality of dust particles, after the anti-blocking automatic flue gas sampler takes out a certain amount of flue gas from the flue gas pipeline at every time, a plurality of dust particles can be remained in the anti-blocking automatic flue gas sampler, and the dust particles are accumulated in the anti-blocking automatic flue gas sampler, so that the loss of the anti-blocking automatic flue gas sampler can be increased, and the service life of the anti-blocking automatic flue gas sampler can be shortened.
The existing automatic sampling preprocessor for smoke has the following defects: 1. the back-blowing loop of the back-blowing device is single, and the sampling probe is easy to block. 2. The thermocouple is often used for detecting the heating temperature of the heating device, and the sample gas temperature is not directly detected, so that the sample gas temperature of the conveying pipe cannot be truly reflected. 3. The heating temperature is insufficient, so that the humidity of the sample gas is high, the accuracy of a continuous online flue gas monitoring system is influenced, and the fault rate of a flue gas analyzer is high. The invention provides improvement according to the problems, is suitable for continuous and automatic sampling of flue gas with high humidity and high dust concentration, is applied to a pretreatment part of a continuous on-line flue gas monitoring system, and improves the accuracy and reliability of a flue gas measurement result.
Disclosure of Invention
The invention aims to provide an automatic flue gas sampling preprocessor which is suitable for continuous and automatic sampling of flue gas with high humidity and high dust concentration, and the automatic flue gas sampling preprocessor which can effectively remove dust and dehumidify and the temperature control method thereof are applied to a preprocessing part of a continuous and online flue gas monitoring system, so as to solve the technical problems of high loss and low service life of the existing automatic flue gas preprocessor which is anti-clogging and high in humidity in the prior art.
The invention provides an automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and a temperature control method thereof. The sampling probe comprises a flange, a metal sintering filter element, a cavity, a heating module and a sample gas outlet. The back-blowing device comprises a back-blowing interface, a two-position three-way electromagnetic valve, an air storage tank and a conical flange port. The sampling pipe is connected with the sampling probe, the flange in the sampling probe is connected with the cavity, the cavity is sleeved outside the metal sintering filter element, and the heating module is sleeved outside the metal sintering filter element. The sampling probe is characterized in that the sample gas outlet is connected with a gas transmission pipe, the gas temperature detector is used for detecting the temperature of the flue gas in the gas transmission pipe and feeding back the temperature to the heating module to control the heating temperature, so that the temperature of the flue gas in the gas transmission pipe is not lower than 110 ℃, and the moisture in the flue gas is prevented from entering the analysis system to influence the measurement accuracy. The back-blowing device uses clean compressed air to blow dust attached to the outer surface of the metal sintering filter element, and the dust is blown into the back flue through the polymerization of the conical flange port, so that the loss of the anti-blocking automatic flue gas sampler is reduced. The metal sintering filter element and the sample gas outlet are provided with back flushing ports, so that an internal and external back flushing dual cleaning mode is formed, the blocking phenomenon of long-term continuous sampling of the sampling probe is effectively prevented, and the service life of the automatic flue gas sampling preprocessor is prolonged.
The sampling probe comprises a flange, a metal sintering filter element, a cavity, a heating module and a sample gas outlet.
Further, the metal sintering filter element is a nickel-based synthetic metal raw material, and the filter precision density is 2 um.
The back-blowing device comprises a back-blowing interface, a two-position three-way electromagnetic valve, an air storage tank and a conical flange port.
Furthermore, the conical flange port blows to be the cone structure of oblique angle 120, and the structure that enlarges suddenly under the blowback effect makes the blowback air current change into sharp air current from the air current, strengthens blowback air pressure to strengthen the blowback effect.
Furthermore, the sampling probe is connected with the sample gas outlet to form a gas conveying pipe, the gas temperature detection device is used for detecting the temperature of the flue gas in the gas conveying pipe and heating and controlling the flue gas in the gas conveying pipe, the sampler cavity is heated by detecting the temperature difference value of the flue gas in the pipe and the set temperature, the temperature detector is internally provided with a PID algorithm, so that the temperature error is controlled within 0.5 ℃, compared with the traditional method for separately detecting the temperature of the heating cavity, the method for detecting the temperature of the gas in the actual pipe serves as a temperature feedback point, the actual temperature of the gas can be more directly reflected, and the condition that the actual temperature of the gas is lower than the set temperature due to factors such as.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic overall structural diagram of an automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of temperature control according to an embodiment of the present invention.
Wherein the reference numerals are summarized as follows:
the device comprises a sampling pipe 1, a sampling probe 2, a flange 201, a metal sintered filter element 202, a cavity 203, a heating module 204, a sample gas outlet 205, a gas pipe 3, a gas temperature detector 4, a back-blowing device 5, a back-blowing interface 501, a two-position three-way electromagnetic valve 502, a gas storage tank 503 and a conical flange opening 504.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic overall structure diagram of an automatic flue gas sampling preprocessor for effectively removing dust and moisture according to an embodiment of the present invention; fig. 2 is a schematic diagram of temperature control according to an embodiment of the present invention.
The invention provides an automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and a temperature control method thereof, and as shown in figure 1, the preprocessor comprises a sampling tube 1, a sampling probe 2, a gas conveying pipe 3, a gas temperature detector 4 and a back flushing device 5. The sampling probe comprises a flange 201, a metal sintered filter element 202, a cavity 203, a heating module 204 and a sample gas outlet 205. The back-blowing device comprises a back-blowing interface 501, a two-position three-way electromagnetic valve 502, an air storage tank 503 and a conical flange opening 504. The sampling pipe is connected with the sampling probe 2, the flange 201 in the sampling probe 2 is connected with the cavity 203, the cavity is sleeved outside the metal sintering filter element 202, and the heating module 204 is sleeved outside the metal sintering filter element 202. The sampling probe 2 is characterized in that the sample gas outlet 205 is connected with the gas transmission pipe 3, the gas temperature detector 4 is used for detecting the temperature of the flue gas in the gas transmission pipe 3 and feeding back the temperature to the heating module 204 to control the heating temperature, so that the temperature of the flue gas in the gas transmission pipe 3 is not lower than 110 ℃, and the moisture in the flue gas is prevented from entering the analysis system to influence the measurement accuracy. The back-blowing device 5 uses clean compressed air to blow dust attached to the outer surface of the metal sintering filter element 202, and the dust is blown back into the flue through the polymerization of the conical flange port 504, so that the loss of the anti-blocking automatic flue gas sampler is reduced. The metal sintering filter element 202 and the sample gas outlet are provided with back flushing ports, so that an internal and external back flushing dual cleaning mode is formed, the blocking phenomenon of long-term continuous sampling of the sampling probe is effectively prevented, and the service life of the automatic flue gas sampling preprocessor is prolonged.
Further, the sampling probe 2 the metal sintering filter element 202 is a nickel-based synthetic metal material, and the filter precision density is 2 um.
The back-blowing device 5 comprises a back-blowing interface 501, a two-position three-way electromagnetic valve 502, an air storage tank 503 and a conical flange opening 504.
Further, the conical flange port 504 blows into a cone structure with an oblique angle of 120 degrees, and the structure suddenly expanded under the back blowing action enables back blowing air flow to be converted into urgent air flow from the air flow, so that the back blowing air pressure is enhanced, and the back blowing effect is enhanced.
Further, sampling probe 2 with sample gas outlet 205 connects gas-supply pipe 3, gas temperature detection device 4 is arranged in detecting the temperature of flue gas in the gas-supply pipe 3 and carries out heating control to flue gas in the gas-supply pipe 3, through detecting flue gas temperature in the pipeline and the temperature difference that establishes, heats sample thief cavity 203, the built-in PID algorithm of temperature detector makes temperature error control in 0.5 ℃, compare with the traditional method of detecting heating chamber temperature alone, detect the gas temperature in the actual pipeline as the temperature feedback point, more can directly reflect gaseous true temperature, avoid factors such as velocity of flow, humidity to lead to actual gas temperature to be less than the temperature that establishes.
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 invention 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 (4)
1. An automatic sampling preprocessor for flue gas with effective dust removal and dehumidification and a temperature control method thereof are characterized by comprising a sampling tube, a sampling probe, a gas pipe, a gas temperature detector and a back flushing device; the sampling probe comprises a flange, a metal sintering filter element, a cavity, a heating module and a sample gas outlet; the back-blowing device comprises a back-blowing interface, a two-position three-way electromagnetic valve, an air storage tank and a conical flange port; the sampling pipe is connected with the sampling probe, the flange in the sampling probe is connected with the cavity, the cavity is sleeved outside the metal sintering filter element, and the heating module is sleeved outside the metal sintering filter element; the sampling probe is characterized in that the sample gas outlet is connected with a gas transmission pipe, the gas temperature detector is used for detecting the temperature of the flue gas in the gas transmission pipe and feeding back the temperature to the heating module to control the heating temperature, so that the temperature of the flue gas in the gas transmission pipe is not lower than 110 ℃, and the moisture in the flue gas is prevented from entering an analysis system to influence the measurement accuracy; the back-blowing device uses clean compressed air to blow dust attached to the outer surface of the metal sintering filter element, and the dust is blown back into the flue through the polymerization of the conical flange port, so that the loss of the anti-blocking automatic flue gas sampler is reduced; the metal sintering filter element and the sample gas outlet are provided with back flushing ports, so that an internal and external back flushing dual cleaning mode is formed, the blocking phenomenon of long-term continuous sampling of the sampling probe is effectively prevented, and the service life of the automatic flue gas sampling preprocessor is prolonged.
2. The sampling probe of claim 1, wherein the sampling probe comprises a flange, a metal sintered filter element, a cavity, a heating module, a sample gas outlet; the metal sintering filter core is a nickel-based synthetic metal raw material, and the filter precision density is 2 um.
3. The blowback apparatus of claim 1, wherein the blowback apparatus comprises a blowback interface, a two-position three-way solenoid valve, a gas storage tank, a conical flange port; the conical flange opening is blown into a conical structure with an oblique angle of 120 degrees, and the structure which is suddenly expanded under the back blowing action enables back blowing air flow to be converted into urgent air flow from buffer air flow, so that the back blowing air pressure is enhanced, and the back blowing effect is enhanced.
4. The gas temperature detection device according to claim 1, wherein the sampling probe is connected with the sample gas outlet to the gas transmission pipe, the gas temperature detection device is used for detecting the temperature of the flue gas in the gas transmission pipe and heating and controlling the flue gas in the gas transmission pipe, the cavity of the sampler is heated by detecting the temperature difference between the flue gas in the pipe and the set temperature, and the temperature detector is internally provided with a PID algorithm to control the temperature error within 0.5 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911049050.8A CN110763524A (en) | 2019-10-31 | 2019-10-31 | Automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and temperature control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049050.8A CN110763524A (en) | 2019-10-31 | 2019-10-31 | Automatic flue gas sampling preprocessor capable of effectively removing dust and dehumidifying and temperature control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380726A (en) * | 2020-05-09 | 2020-07-07 | 洛阳三隆安装检修有限公司 | Boiler flue gas sampling system |
| CN111897027A (en) * | 2020-07-22 | 2020-11-06 | 中国石油化工股份有限公司 | Anti-blocking detection cleaning device and method for CEMS probe |
| CN114354848A (en) * | 2021-12-16 | 2022-04-15 | 江苏若比林环保设备有限公司 | Self-feedback temperature-increasing type indoor decoration gas detection device |
-
2019
- 2019-10-31 CN CN201911049050.8A patent/CN110763524A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380726A (en) * | 2020-05-09 | 2020-07-07 | 洛阳三隆安装检修有限公司 | Boiler flue gas sampling system |
| CN111897027A (en) * | 2020-07-22 | 2020-11-06 | 中国石油化工股份有限公司 | Anti-blocking detection cleaning device and method for CEMS probe |
| CN111897027B (en) * | 2020-07-22 | 2023-06-02 | 中国石油化工股份有限公司 | CEMS probe anti-blocking detection cleaning device and method |
| CN114354848A (en) * | 2021-12-16 | 2022-04-15 | 江苏若比林环保设备有限公司 | Self-feedback temperature-increasing type indoor decoration gas detection device |
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