Jet sampling probe diluting device

Abstract

The utility model discloses a jet flow sampling probe diluting device which comprises a shell provided with a sample gas cavity and a jet flow pump, the shell is provided with a back flushing pipeline, a probe pipe and a smoke outlet which are communicated with the sample gas cavity, the jet flow pump is arranged on the shell, and a diluting gas chamber of a Venturi structure is arranged in the jet flow pump. The two ends of the dilution gas chamber are respectively communicated with the dilution sample gas outlet and the dilution gas inlet, and the suction end of the dilution gas chamber is communicated with the flue gas outlet. According to the utility model, the probe tube is arranged in the chimney to be detected, standard gas enters the dilution gas chamber through the dilution gas inlet, in the process, the venturi structure in the jet pump mixes and dilutes sucked flue gas and dry and clean air conveyed from the dilution gas inlet, and then the flue gas analyzer analyzes and measures the flue gas. The detection is more convenient, the dew point of the diluted sample gas can be greatly reduced, the requirement on the precision of an analyzer is lower, and the detection data is more accurate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sampling monitoring technical field, concretely relates to a kind of jet flow sampling probe dilution device. BACKGROUND

[0002] When using thermal power generation, a large amount of flue gas is generated by coal-fired power plant combustion, and a large amount of nitrogen oxides are contained in the flue gas. In order to treat the nitrogen oxides in the flue gas, a reducing agent ammonia is generally used to react with the nitrogen oxides, thereby reducing the content of nitrogen oxides in the flue gas. However, in actual application, the amount of reducing agent ammonia used is difficult to accurately control. If the amount of reducing agent ammonia used is small, it is difficult to effectively reduce the content of nitrogen oxides. If the amount of reducing agent ammonia used is too much, it is easy to cause secondary pollution and increase the use cost. Therefore, it is necessary to detect the discharged flue gas.

[0003] The existing flue gas detection generally extracts a certain amount of flue gas, then filters and dehumidifies the flue gas through a pretreatment system, and then enters the analysis and measurement. However, this detection method is not only complex, but also requires high precision of the analyzer, and the detection data is difficult to reflect the actual emission concentration. CONTENT OF THE UTILITY MODEL

[0004] (1) Technical problem to be solved

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a jet flow sampling probe dilution device. The device aims to solve the problem that the existing flue gas detection method is not only complex, but also requires high precision of the analyzer, and the detection data is difficult to reflect the actual emission.

[0006] (2) Technical scheme

[0007] In order to solve the above technical problems, the utility model provides a jet flow sampling probe dilution device. The device comprises a shell provided with a sample gas cavity and a jet pump. The shell is provided with a back flushing pipe, a probe pipe and a flue gas outlet which are in communication with the sample gas cavity. The jet pump is installed on the shell and internally provided with a dilution gas chamber with a Venturi structure. The dilution gas chamber is in communication with a dilution sample gas outlet and a dilution gas inlet at both ends. The suction end of the dilution gas chamber is in communication with the flue gas outlet. The jet pump is used to introduce the flue gas from the sample gas cavity into the dilution gas chamber for dilution with dry instrument air.

[0008] Preferably, a probe pipe mounting flange is mounted on the probe pipe, and the probe pipe extends into the interior of the sample gas cavity.

[0009] Further, a filter element is mounted in the interior of the sample gas cavity, and the filter element is used to filter the sundries and dust in the sample gas.

[0010] Further, the first heater is installed on the shell, and the first temperature sensor is installed in the sample gas cavity.

[0011] Further, the filter core comprises an inner layer and an outer layer, the inner layer is a ceramic filter layer, and the outer layer is a mesh layer.

[0012] Further, the inner wall of the sample gas cavity is installed with a heat preservation layer made of high-density polyethylene.

[0013] Further, the heating tank is connected with the back flushing pipeline through a three-way electromagnetic valve, the second heater and the second temperature sensor are installed in the heating tank, and the other end of the heating tank is communicated with the inlet of the back flushing pipeline through a three-way pipe.

[0014] Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the utility model lie in that:

[0016] The utility model discloses a heating tank and a second heater are installed on the back flushing pipeline in parallel, can cooperate with the three-way electromagnetic valve and the controller outside to realize the gas path switching under the low temperature condition, the air preheated in the heating tank is passed into the sample gas cavity during back flushing, so that the sample gas cavity, the filter core and the whole pipeline are swept through the high-temperature air, and the gas path temperature is kept from reducing during the sweeping process, avoids the condensation of residual flue gas or water in the back flushing air in the device, does not cause the condensation and gathering of the dust or other aerosol substances accumulated in the pipeline, and the back flushing effect is better.

[0017] The utility model discloses a heating tank and a second heater are installed on the back flushing pipeline in parallel, can cooperate with the three-way electromagnetic valve and the controller outside to realize the gas path switching under the low temperature condition, the air preheated in the heating tank is passed into the sample gas cavity during back flushing, so that the sample gas cavity, the filter core and the whole pipeline are swept through the high-temperature air, and the gas path temperature is kept from reducing during the sweeping process, avoids the condensation of residual flue gas or water in the device, does not cause the condensation and gathering of the dust or other aerosol substances accumulated in the pipeline, and the back flushing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the cross section structure schematic diagram of the utility model.

[0019] Figure 2 It is the structure schematic diagram of the heater installed on the back flushing pipeline of the utility model.

[0020] Figure 3The utility model discloses a Figure 2 Amplification structure schematic diagram of A place in the middle.

[0021] The mark in the drawing is: 1, sample gas cavity;2, shell;3, jet pump;4, back flushing pipeline;5, probe pipe;6, flue gas outlet;7, dilute sample gas outlet;8, dilute gas inlet;9, dilute gas chamber;10, mounting flange;11, filter core;12, first heater;13, first temperature sensor;14, heat preservation layer;15, three -way electromagnetic valve;16, heating box;17, second heater;18, second temperature sensor;19, three -way pipe;1101, inner layer;1102, outer layer. Specific implementation

[0022] The specific implementation is a kind of jet sampling probe dilution device, its structural schematic diagram as shown in Figure 1 The device includes the shell 2 with sample gas cavity 1 and jet pump 3, the main components of jet pump 3 include nozzle, throat pipe and diffusion pipe, working fluid is ejected from nozzle at high speed, forms high-speed jet, the air in pipe is taken away at throat pipe inlet due to the turbulent diffusion effect of jet, forms vacuum, to suck the fluid to be transported, two fluids mix in throat pipe and carry out energy exchange, finally most of kinetic energy is converted into pressure energy through diffusion pipe, completes the transportation process, shell 2 is installed with back flushing pipeline 4, probe pipe 5 and flue gas outlet 6 in communication with sample gas cavity 1, jet pump 3 is installed on shell 2 and is internally provided with dilute gas chamber 9 of venturi structure, the two ends of dilute gas chamber 9 are communicated with dilute sample gas outlet 7 and dilute gas inlet 8 respectively, the suction end of dilute gas chamber 9 is communicated with flue gas outlet 6, jet pump 3 is used to introduce flue gas from sample gas cavity 1 into dilute gas chamber 9 and dilute with dry instrument air.

[0023] As shown in Figure 1 In the embodiment, probe pipe 5 is installed with probe pipe mounting flange 10, probe pipe 5 extends to the inside of sample gas cavity 1, and probe pipe 5 is sealed between shell 2 by using sealing ring to avoid gas leakage.

[0024] As shown in Figure 1 In the embodiment, filter core 11 is installed in the inside of sample gas cavity 1, and filter core 11 is used to filter sundries and dust in sample gas, so that the purity of sample gas can be ensured, and the sampling probe and gas measuring equipment can be prevented from being damaged.

[0025] As shown in Figure 1 And Figure 2 In the embodiment, first heater 12 is installed on shell 2, and first temperature sensor 13 is installed in the inside of sample gas cavity 1, and first heater 12 is used to heat flue gas in the inside of sample gas cavity 1.

[0026] In this way, it can be ensured that the dew point temperature of the sample gas is not lower than the ambient temperature. The first heater 12 can be a heating rod or a heating coil, and is accurately controlled by the first temperature sensor 13.

[0027] like Figures 1-3 As shown: In this embodiment, the filter element 11 includes an inner layer 1101 and an outer layer 1102, the inner layer 1101 is a ceramic filter layer, and the outer layer 1102 is a mesh layer;

[0028] Specifically, the outer layer 1102 is made of 304 stainless steel mesh, and is supported and protected by the outer layer 1102 wrapped around the outer peripheral wall of the ceramic filter layer. When the flue gas enters the sample gas cavity 1 through the probe tube 5, it is filtered by the ceramic filter layer of the filter element 11. After the ceramic material absorbs large particles of impurities in the flue gas, the flue gas enters the flue gas outlet 6 through the mesh layer.

[0029] Since porous ceramic is used as the material of the filter layer, it not only has high adsorption efficiency but also has corrosion resistance and strong corrosion resistance, which extends the service life of the filter element 11 and reduces the maintenance workload.

[0030] like Figure 2 and Figure 3 As shown: In this embodiment, the inner wall of the sample gas cavity 1 is installed with an insulation layer 14, and the insulation layer 14 is made of high-density polyethylene. Such an insulation layer 14 can reduce the heat dissipation speed of the sample gas cavity 1 and ensure the temperature inside the sample gas cavity 1 is stable.

[0031] like Figure 2 As shown: In this embodiment, the backflush pipeline 4 is connected to a heating box 16 through a three-way solenoid valve 15. A second heater 17 and a second temperature sensor 18 are installed inside the heating box 16. The other end of the heating box 16 is connected to the inlet of the backflush pipeline 4 through a three-way pipe 19;

[0032] By installing a heating box 16 and a second heater 17 in parallel on the backblowing pipeline 4, the three-way solenoid valve 15 and an external controller can be used to achieve gas path switching under low temperature conditions. During backblowing, the pre-heated air in the heating box 16 is passed into the sample gas cavity 1, thereby purging the sample gas cavity 1, the filter element 11 and the entire pipeline with high-temperature air, and the gas path temperature is kept from decreasing during the purging process, thereby avoiding condensation of residual smoke or water in the backblowing air in the device, and will not cause condensation and aggregation of dust or other aerosol-like substances accumulated in the pipeline, and the backblowing effect is better.

[0033] Working principle: when using, the probe tube 5 is placed in the chimney to be detected, the standard gas enters the inside of the dilution gas chamber through the dilution gas inlet 8, in the process, the vacuum negative pressure is formed at the smoke outlet 6 through the Venturi structure inside the dilution gas chamber 9, the sampling gas can be sucked into the sample gas cavity 1 through the probe tube 5 by the action of the negative pressure vacuum, then the smoke enters the smoke outlet 6 after passing through the filter core 11, then the smoke enters the dilution gas chamber 9, and is mixed and diluted with the dry and clean air delivered from the dilution gas inlet 8 in the dilution gas chamber 9, finally, the diluted sample gas is output to the smoke analyzer through the dilution sample gas outlet 7, and is analyzed and measured by the smoke analyzer, the filter core 11 will be blocked after long time use, at this time, the external controller controls the second heater 17 to heat the air in the heating box 16, when the second temperature sensor 18 detects that the temperature is the same as the temperature inside the device, the three-way electromagnetic valve 15 is opened, the back flushing pipeline 4 is communicated with the sample gas cavity 1 after passing through the heating box 16, then the preheated air in the heating box 16 is introduced into the sample gas cavity 1 during back flushing, so that the sample gas cavity 1, the filter core 11 and the whole pipeline are purged by the high-temperature air, and the temperature of the air path is not reduced during the purging process, so that the residual smoke or water in the back flushing air cannot be condensed in the device, the accumulated dust or other aerosol substances in the pipeline cannot be condensed and gathered, and the back flushing effect is better.

[0034] All the technical features in the embodiment can be freely combined according to actual needs.

[0035] The above embodiment is a preferred implementation scheme of the utility model, in addition, the utility model can be realized in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the utility model.

Claims

1. A dilution device for a fluidic sampling probe, the device comprising a housing (2) provided with a sample gas chamber (1) and a fluidic pump (3), characterized in that: The shell (2) is provided with a back flushing pipeline (4) communicated with the sample gas cavity (1), a probe tube (5) and a flue gas outlet (6), the jet pump (3) is installed on the shell (2) and internally provided with a dilution gas chamber (9) of Venturi structure, two ends of the dilution gas chamber (9) are respectively communicated with a dilution sample gas outlet (7) and a dilution gas inlet (8), the suction end of the dilution gas chamber (9) is communicated with the flue gas outlet (6), and the jet pump (3) is used for introducing the flue gas from the sample gas cavity (1) into the dilution gas chamber (9) to be diluted with dry instrument air.

2. The fluidic sampling probe dilution device of claim 1, wherein, The probe tube (5) is provided with a probe tube mounting flange (10), and the probe tube (5) extends to the inside of the sample gas cavity (1).

3. The fluidic sampling probe dilution device of claim 2, wherein, The sample gas cavity (1) is internally provided with a filter core (11), and the filter core (11) is used for filtering sundries and dust in the sample gas.

4. The fluidic sampling probe dilution device of claim 3, wherein, The shell (2) is provided with a first heater (12), and the sample gas cavity (1) is internally provided with a first temperature sensor (13), and the first heater (12) is used for heating the flue gas in the sample gas cavity (1).

5. The fluidic sampling probe dilution device of claim 4, wherein, The filter core (11) comprises an inner layer (1101) and an outer layer (1102), the inner layer (1101) is a ceramic filter layer, and the outer layer (1102) is a mesh layer.

6. The fluidic sampling probe dilution device of claim 5, wherein, The inner wall of the sample gas cavity (1) is provided with a heat preservation layer (14), and the heat preservation layer (14) is made of high-density polyethylene.

7. The fluidic sampling probe dilution device of claim 6, wherein, The back flushing pipeline (4) is connected with a heating box (16) through a three-way electromagnetic valve (15), the heating box (16) is internally provided with a second heater (17) and a second temperature sensor (18), and the other end of the heating box (16) is communicated with the inlet of the back flushing pipeline (4) through a three-way tube (19).

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