CEMS multifunctional flue gas sampling pipeline structure

Abstract

The utility model relates to a CEMS (Continuous Emission Monitoring System) multifunctional flue gas sampling pipeline structure, which detects the temperature of flue gas entering a sampling pipeline body through a temperature sensor, and when the temperature is reduced, a heating assembly is started through the fed-back temperature to heat the sampling pipeline body, so that the temperature is kept stable, the problem of condensation of the flue gas is avoided, and the sampling pipeline body is protected. Therefore, the accuracy of subsequent detection results is ensured; the flow rate of flue gas passing through the sampling pipeline body is detected through the flue gas flow rate sensor, when the flow rate of the flue gas is reduced, it is indicated that the filter screen is blocked, the Z-direction driving mechanism drives the air supply pipe to ascend, the nozzle of the air supply pipe purges the filter screen, large-particle impurities on the outer surface of the filter screen are blown off, and therefore it is guaranteed that the flow rate of the flue gas is stable; and the accuracy of subsequent detection results is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke sampling pipelines, and in particular to a CEMS multifunctional smoke sampling pipeline structure. Background Art

[0002] At present, CEMS flue gas sampling pipelines are usually installed in the flue of municipal solid waste incineration power plants. The full name of CEMS is "continuous monitoring system for flue gas emissions", which refers to a device that continuously monitors the concentration and total amount of gaseous pollutants and particulate matter emitted by air pollution sources and transmits the information to the competent authorities in real time. In order to avoid condensation during the flue gas transmission process, which affects the accuracy of sample collection, the existing flue gas sampling pipelines are usually equipped with a heating structure.

[0003] For example, CN 217304523 U discloses a heat-tracing CEMS flue gas sampling tube with an anti-condensation device, which includes a protective shell, a water pipe is arranged in the inner cavity of the protective shell, an aluminum foil layer is arranged in the inner cavity of the protective shell, an insulation layer is arranged in the inner cavity of the aluminum foil layer, a double C-claw is arranged at the upper edge of the right end face of the insulation layer, a T-shaped buckle is fixedly connected to the lower end face of the double C-claw, a built-in signal line is arranged in the inner cavity of the T-shaped buckle, and a reinforced heating belt is arranged outside the built-in signal line. However, the following problems still exist during use: 1. When the flue gas velocity through the sampling tube is uneven, the sampling accuracy will be low; 2. Large particles of debris in the flue enter the sampling tube with the flue gas, which is easy to damage the subsequent analysis equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a CEMS multifunctional flue gas sampling pipeline structure with a reasonable structure and reliable use to solve the above-mentioned problems. On the one hand, it ensures the stability of the sampling temperature, and on the other hand, it ensures the stability of the sampling flow rate, thereby ensuring the accuracy of sample collection and avoiding large particles in the flue gas from damaging subsequent analysis equipment.

[0005] The technical solution of the utility model is:

[0006] A CEMS multifunctional flue gas sampling pipeline structure comprises a sampling pipeline body, a concentric protective sleeve arranged outside the sampling pipeline body, a heat preservation layer and a heating component arranged inside the concentric protective sleeve, and the technical key points are: a concentric insulating sleeve is arranged on the inner circumference of the heat preservation layer, an annular heating space is formed between the inner circumference of the concentric insulating sleeve and the outer circumference of the sampling pipeline body, the heating component is fixed in the annular heating space, two positioning seats connected to the sampling pipeline body are fixed on the top surface of the concentric protective sleeve, a temperature sensor is fixed on one of the positioning seats, a flue gas flow rate sensor is fixed on the other positioning seat, and the A pressure cap is fixed to the front end of the concentric protective sleeve, a center hole corresponding to the front port of the sampling pipeline body is provided in the middle of the pressure cap, a filter is fixed to the outer end surface of the pressure cap, a radial through hole connected to the center hole is provided on the outer peripheral surface of the pressure cap, an air supply pipe is inserted in the radial through hole, a nozzle facing the filter is fixed at the inner end of the air supply pipe, a control valve is fixed at the outer end of the air supply pipe, an L-shaped connecting pipe connected to the inlet of the control valve, a reset spring assembly is fixed between the horizontal section of the L-shaped connecting pipe and the bottom surface of the concentric protective sleeve, and a Z-direction drive mechanism corresponding to the L-shaped connecting pipe is also provided on the bottom surface of the concentric protective sleeve.

[0007] The above-mentioned CEMS multifunctional flue gas sampling pipeline structure, the heating component is composed of a plurality of constant temperature heating belts, the constant temperature heating belts extend from the front end of the annular heating space to the rear end of the annular heating space, and each of the constant temperature heating belts is arranged around the center line of the annular heating space.

[0008] The above-mentioned CEMS multifunctional flue gas sampling pipeline structure has a flange at the rear end of the sampling pipeline body that closes the rear port of the concentric protective sleeve, a concentric flange body is fixed to the outer end face of the flange, and an external thread for connecting to a subsequent analysis device is provided on the pipe section of the concentric flange body, a wire connected to a heating component is injection-molded in the concentric flange body, and a terminal connected to the wire is fixed on the outer peripheral surface of the flange of the concentric flange body.

[0009] In the above-mentioned CEMS multifunctional flue gas sampling pipeline structure, the detection heads of the temperature sensor and the flue gas flow rate sensor are inserted into the sampling pipeline body through the lower ports of the corresponding positioning seats, and the positioning seat is provided with a heat-insulating material.

[0010] In the above-mentioned CEMS multifunctional flue gas sampling pipeline structure, the Z-direction driving mechanism is an inverted electric push rod, a longitudinal push handle is fixed to the end of the electric push rod, and the longitudinal push handle is located below the L-shaped connecting pipe.

[0011] The above-mentioned CEMS multifunctional flue gas sampling pipeline structure, the reset spring assembly includes a fixing seat fixed to the bottom surface of the concentric protective sleeve, a connecting sleeve arranged on the horizontal section of the L-shaped connecting pipe, and a reset spring connected between the fixing seat and the connecting sleeve.

[0012] In the above-mentioned CEMS multifunctional flue gas sampling pipeline structure, a groove corresponding to the nozzle is provided on the inner wall of the central hole of the gland, so that when not in use, the nozzle is hidden in the groove under the action of the reset spring assembly.

[0013] The beneficial effects of the utility model are:

[0014] 1. The temperature of the flue gas entering the sampling pipeline body is detected by the temperature sensor. When the temperature drops, the heating component is started through the feedback temperature to heat the sampling pipeline body, thereby maintaining a stable temperature and avoiding condensation of the flue gas, thereby ensuring the accuracy of the subsequent detection results.

[0015] 2. The flue gas flow rate sensor detects the flue gas flow rate through the sampling pipeline. When the flue gas flow rate decreases, it indicates that there is a blockage problem at the filter. The Z-axis drive mechanism drives the air supply pipe to rise, so that its nozzle blows the filter and blows off the large particles on the outer surface of the filter, thereby ensuring the stability of the flue gas flow rate and the accuracy of the subsequent detection results.

[0016] 3. The setting of the filter also prevents large particles of debris in the flue gas from entering the sampling pipeline body, avoiding damage to subsequent analysis equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 AA section view.

[0019] In the figure: concentric flange body 1, flange plate 2, concentric protective sleeve 3, insulation layer 4, concentric insulating sleeve 5, positioning seat 6, temperature sensor 7, insulation material 8, flue gas flow rate sensor 9, annular heating space 10, gland 11, filter 12, center hole 13, nozzle 14, air supply pipe 15, control valve 16, L-shaped connecting pipe 17, reset spring 18, longitudinal push handle 19, electric push rod 20, constant temperature heating belt 21, sampling pipeline body 22, wire 23, terminal 24, external thread 25, fixing seat 26, connecting sleeve 27. DETAILED DESCRIPTION

[0020] The utility model is described in detail according to the accompanying drawings of the specification.

[0021] like Figure 1 , Figure 2 As shown, the CEMS multifunctional flue gas sampling pipeline structure includes a sampling pipeline body 22, a concentric protective sleeve 3 arranged outside the sampling pipeline body 22, a heat preservation layer 4 arranged inside the concentric protective sleeve 3, and a heating component.

[0022] Among them, the inner circumference of the thermal insulation layer 4 is provided with a concentric insulating sleeve 5, and an annular heating space 10 is formed between the inner circumference of the concentric insulating sleeve 5 and the outer circumference of the sampling pipeline body 22, and the heating component is fixed in the annular heating space 10. In this embodiment, the heating component is composed of three constant temperature heating belts 21, and the constant temperature heating belts 21 extend from the front end of the annular heating space 10 to the rear end of the annular heating space 10, and each of the constant temperature heating belts 21 is arranged around the center line of the annular heating space 10. The rear end of the sampling pipeline body 22 is provided with a flange 2 that closes the rear port of the concentric protective sleeve 3, and the outer end surface of the flange 2 is fixed with a concentric flange body 1, and the pipe section of the concentric flange body 1 is provided with an external thread 25 for connecting with a subsequent analysis device, and the concentric flange body 1 is injection-molded with a wire 23 connected to each constant temperature heating belt 21, and a terminal 24 connected to the wire 23 is fixed on the outer circumference of the flange of the concentric flange body 1.

[0023] Two positioning seats 6 connected to the sampling pipeline body 22 are fixed on the top surface of the concentric protective sleeve 3, a temperature sensor 7 is fixed on one of the positioning seats 6, and a flue gas flow rate sensor 9 is fixed on the other positioning seat 6. In this embodiment, the detection heads of the temperature sensor 7 and the flue gas flow rate sensor 9 are inserted into the sampling pipeline body 22 through the lower ports of the corresponding positioning seats 6, and the positioning seats 6 are provided with a heat preservation material 8.

[0024] A gland 11 is fixed to the front end of the concentric protective sleeve 3. A center hole 13 corresponding to the front port of the sampling pipeline body 22 is provided in the middle of the gland 11. A filter screen 12 is fixed to the outer end surface of the gland 11. A radial through hole connected to the center hole 13 is provided on the outer peripheral surface of the gland 11. An air supply pipe 15 is inserted in the radial through hole. A nozzle 14 facing the filter screen is fixed to the inner end of the air supply pipe 15. A control valve 16 is fixed to the outer end of the air supply pipe 15. An L-shaped connecting pipe 17 connected to the inlet of the control valve 16 is fixed. A reset spring assembly is fixed between the horizontal section of the L-shaped connecting pipe 17 and the bottom surface of the concentric protective sleeve 3. A Z-direction driving mechanism corresponding to the L-shaped connecting pipe 17 is also provided on the bottom surface of the concentric protective sleeve 3. In this embodiment, the reset spring assembly includes a fixing seat 26 fixed to the bottom surface of the concentric protective sleeve 3, a connecting sleeve 27 provided on the horizontal section of the L-shaped connecting pipe 17, and a reset spring 18 connected between the fixing seat 26 and the connecting sleeve 27. The Z-direction driving mechanism is an inverted electric push rod 20, and a longitudinal push handle 19 is fixed to the end of the electric push rod 20. The longitudinal push handle 19 is located below the L-shaped connecting tube 17. A groove corresponding to the nozzle 14 is provided on the inner wall of the central hole 13 of the gland 11, so that the nozzle is hidden in the groove under the action of the return spring assembly when not in use.

[0025] Working principle:

[0026] 1. Under the negative pressure of the CEMS system, the flue gas passes through the filter 12 and enters the sampling pipeline body 22. During this process, the temperature sensor 7 detects the flue gas temperature in real time, and the flue gas flow rate sensor 9 detects the flue gas flow rate in real time.

[0027] 2. When the temperature sensor 7 detects that the temperature is lower than the set temperature lower limit, the heating component takes power through the feedback temperature to heat the sampling pipeline body 22, thereby maintaining a stable temperature and avoiding condensation of flue gas.

[0028] 3. When the flue gas flow rate sensor 9 detects that the flue gas flow rate is lower than the set lower limit of the flow rate, it indicates that there is a blockage problem at the filter 12. The electric push rod 20 drives the longitudinal push handle 19 upward, thereby pushing the L-shaped connecting pipe 17 and the air supply pipe 15 upward, so that the nozzle 14 of the air supply pipe 15 is separated from the groove. During this process, the control valve 16 is opened, and the L-shaped connecting pipe 17 is filled with purge gas. The purge gas passes through the L-shaped connecting pipe 17, the air supply pipe 15 and the nozzle 14 and is sprayed toward the filter 12, blowing off the large particles of debris on the outer surface of the filter 12, thereby ensuring the stability of the flue gas flow rate.

[0029] The above embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A CEMS multifunctional flue gas sampling pipeline structure, comprising a sampling pipeline body, a concentric protective sleeve arranged outside the sampling pipeline body, an insulation layer and a heating component arranged inside the concentric protective sleeve, characterized in that: The inner circumference of the thermal insulation layer is provided with a concentric insulating sleeve, and an annular heating space is formed between the inner circumference of the concentric insulating sleeve and the outer circumference of the sampling pipeline body. The heating component is fixed in the annular heating space. Two positioning seats connected to the sampling pipeline body are fixed on the top surface of the concentric protective sleeve, one of which is fixed with a temperature sensor, and the other is fixed with a flue gas flow rate sensor. A gland is fixed at the front end of the concentric protective sleeve, and a center hole corresponding to the front port of the sampling pipeline body is provided in the middle of the gland, and a filter is fixed on the outer end surface of the gland. A radial through hole connected to the center hole is provided on the outer circumference of the gland, and an air supply pipe is inserted in the radial through hole. A nozzle facing the filter side is fixed at the inner end of the air supply pipe, and a control valve is fixed at the outer end of the air supply pipe. An L-shaped connecting pipe is connected to the inlet of the control valve, and a reset spring assembly is fixed between the horizontal section of the L-shaped connecting pipe and the bottom surface of the concentric protective sleeve. A Z-direction driving mechanism corresponding to the L-shaped connecting pipe is also provided on the bottom surface of the concentric protective sleeve.

2. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: The heating assembly is composed of a plurality of constant temperature heating belts, which extend from the front end of the annular heating space to the rear end of the annular heating space, and each of the constant temperature heating belts is arranged around the center line of the annular heating space.

3. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: The rear end of the sampling pipeline body is provided with a flange plate that closes the rear port of the concentric protective sleeve, and a concentric flange body is fixed to the outer end face of the flange plate. The pipe section of the concentric flange body is provided with an external thread for connecting to a subsequent analysis device. A wire connected to a heating component is injection-molded in the concentric flange body, and a terminal connected to the wire is fixed to the outer peripheral surface of the flange of the concentric flange body.

4. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: The detection heads of the temperature sensor and the flue gas flow rate sensor are inserted into the sampling pipeline body through the lower ports of the corresponding positioning seats, and the positioning seats are provided with heat insulation materials.

5. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: The Z-direction driving mechanism is an inverted electric push rod, a longitudinal push handle is fixed to the end of the electric push rod, and the longitudinal push handle is located below the L-shaped connecting tube.

6. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: The reset spring assembly comprises a fixing seat fixed on the bottom surface of the concentric protective sleeve, a connecting sleeve arranged on the horizontal section of the L-shaped connecting pipe, and a reset spring connected between the fixing seat and the connecting sleeve.

7. The CEMS multifunctional flue gas sampling pipeline structure according to claim 1 is characterized in that: A groove corresponding to the nozzle is arranged on the inner wall of the central hole of the pressure cover, so that the nozzle is hidden in the groove under the action of the return spring assembly when not in use.

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