CN214067049U

CN214067049U - Diluting device suitable for atmospheric pollutants concentration monitoring

Info

Publication number: CN214067049U
Application number: CN202023085098.5U
Authority: CN
Inventors: 王艳妮; 杨敬婷; 秦俊虎
Original assignee: GUIZHOU ACADEMY OF ENVIRONMENTAL SCIENCE AND DESIGNING
Current assignee: GUIZHOU ACADEMY OF ENVIRONMENTAL SCIENCE AND DESIGNING
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-08-27
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a diluting device suitable for atmospheric pollutants concentration monitoring, including diluting pipe and dilution system in advance, it includes circular dilution pipe, high efficiency filter, fan, dilutes tub air outlet flow control valve, CO in advance to dilute the pipe in advance₂A concentration sensor, a leading-in port is arranged at the front end of the dilution pipe, and the leading-in ports are arranged along the air flow inlet direction in sequenceThe device comprises a fan and a high-efficiency filter, wherein one end of the fan is directly connected with the atmosphere, and air is sucked in a negative pressure mode and enters a pre-dilution pipe through an inlet to be fully mixed and diluted with sampling smoke. And (4) allowing a part of mixed gas to enter a dilution system, and allowing the redundant gas to pass through an exhaust port at the rear end of the pre-dilution pipe, which is connected with the combustion furnace device, so as to discharge redundant waste gas. The dilution system comprises a primary dilution bin, a secondary dilution bin and a residence chamber. The utility model discloses increase after diluting the pipe in advance, under the dual restriction of operation in the laboratory and on-line monitoring instrument, dilute the pipe in advance and dilute the mutual series connection of system, the control range enlarges several times to tens of times, guarantees better experimental effect.

Description

Diluting device suitable for atmospheric pollutants concentration monitoring

Technical Field

The utility model belongs to the technical field of environmental monitoring, concretely relates to diluting device suitable for atmospheric pollutants concentration monitoring.

Background

The civil biomass combustion source has the characteristics of unstable emission working condition, short combustion time, incomplete combustion and the like, even if the concentration of smoke fluctuates greatly under different combustion conditions in the same stove, the pollutant emission is difficult to measure by using a fixed sampling method. The existing common monitoring methods include a direct sampling method, a dilution sampling method, a smoke cover method, a condensation method and the like, and the sampling method is divided into only offline sampling or only online monitoring, the offline sampling obtains the final experiment result through a weighing method, and the online sampling passes through a light absorption method and a light scattering method. The dilution sampling method is divided into a smoke hood method and a smoke channel method, the smoke channel method comprises a partial dilution method and a full flow dilution method, the dilution multiple of a dilution device in the prior art is mostly about 10-100, and the dilution ratio is calculated to obtain an approximate result according to the ratio of smoke to dilution gas. Dilution sampling device of prior art is used for stable power plant boiler pollution sources more, lacks the simulation monitoring sampling technique of civilian source to the subassembly is complicated, characteristics such as difficult integrated operation, because of quantitative emission monitoring reason, is fixed size mostly, and the place suitability is not high.

In the prior art, for example, application number 201720469311.1 'an atmospheric particulate dilution channel sampler' is dependent on the flow of inlet flue gas and the flow of inlet dilution air in terms of the control and determination of the dilution ratio, the actual dilution effect cannot completely reach the theoretical value level, and the determination of the dilution ratio has large errors, so that the experimental result has large errors with the actual situation. The adjustable range of dilution multiple in the prior art is smaller, the system is difficult to guarantee stability and airtightness after being externally connected with a multi-stage dilution device, the experimental result of the sampling process is rough, and the precision monitoring instrument with smaller range is difficult to match and detect.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a diluting device suitable for atmospheric pollutants concentration monitoring to prior art's not enough.

The utility model provides a diluting device suitable for atmospheric pollutants concentration monitoring which characterized in that includes dilutes pipe and dilution system in advance, it includes circular dilution pipe, high efficiency filter, fan, dilutes tub play gas flow control valve, CO in advance to dilute the pipe in advance₂The front end of the dilution pipe is provided with an introducing port, the introducing port is a fan and a high-efficiency filter in sequence along the air flow inlet direction, one end of the fan is directly connected with ambient atmosphere, ambient air is sucked in through negative pressure and passes through the high-efficiency filter to obtain clean air, and the clean air enters the pre-dilution pipe through the introducing port to be fully mixed and diluted with sampling smoke. And (3) allowing a part of mixed gas to enter a dilution system, and allowing the redundant gas to pass through an exhaust port at the rear end of the pre-dilution pipe, which is connected with the combustion furnace device, to exhaust redundant waste gas, wherein the gas outlet flow control valve is used for controlling the amount of the exhausted gas.

The diluting system comprises a primary diluting bin, a secondary diluting bin and a staying chamber; the outlet end of the pre-dilution pipe is connected with the air inlet of the primary dilution bin through a guide pipe, the primary dilution bin is connected with the secondary dilution bin, and the secondary dilution bin is connected with the staying bin; a clean air inlet is formed in the primary dilution bin, a primary clean air inlet pipe is connected to the primary clean air inlet, and a primary clean air flow control valve is arranged on the primary clean air inlet pipe; a primary bypass outlet is formed in the primary dilution bin, an air outlet pipe is connected to the primary bypass outlet, and a primary bypass air outlet flow control valve is arranged on the air outlet pipe; a secondary clean air inlet is formed in the secondary dilution bin, a secondary clean air inlet pipe is connected to the secondary clean air inlet, and a secondary clean air flow control valve is arranged on the secondary clean air inlet pipe; CO is arranged on the staying bin₂A concentration sensor II which is additionally provided with a connectionThe connecting pipe is connected with a sampling and analyzing device.

The principle of the utility model is as follows: the flue gas concentration that the living beings burning produced is mostly all about several hundred milligrams per square meter, and the dilution ratio of prior art is only about 10-100 times, only is applicable to comparatively crude off-line sampling, can't be applicable to online concentration monitoring, improves the dilution ratio of prior art, the utility model discloses add the pipe that dilutes in advance that the dilution ratio is 1-10 times at original diluting device front end, dilute the actual control range of multiple and can enlarge to 1-500 times, can satisfy online and off-line instrument and sample simultaneously. The experimental results of the two modes can be mutually supplemented and calibrated, the applicability of the device and the reliability of the experimental results are improved, and the pollution emission characteristics of rural civil fixed combustion sources can be comprehensively researched and analyzed.

The utility model has the advantages that: the utility model discloses increase the pipe of diluting in advance, in original technique, its advantage lies in expanding dilution multiple control range, and original technique control range is about 10-100 times, and the actual application efficiency only reaches 70% -80% of ideal effect, and the utility model discloses increase after diluting the pipe in advance, under the dual restriction of operation in the laboratory and on-line monitoring instrument, dilute the pipe in advance and dilute the system and establish ties each other, control range enlarges several times to several tens of times, guarantees better experimental effect. If meet small-scale burning experiment, also can make things convenient for the dismouting by the predilution pipe, improve the practicality of device.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: 1-dilution tube; 2-high efficiency filter; 3, a fan; 4-CO₂A concentration sensor I; 5, an air outlet flow control valve of the pre-dilution pipe; 6-first-stage dilution bin; 7-first-stage clean air inlet; 8-first-stage clean air flow control valve; 9-primary bypass outlet; 10-first level bypass air outlet flow control valve; 11-secondary dilution; 12-two-stage clean air inlet; 13-a secondary clean air flow control valve; 14-absolute pressure sensor; 15-temperature and humidity sensor; 16-a staying bin; 17-CO₂A concentration sensor II; 18-sampling and tube dividing; 19-a particulate cutter; 20-sampling membrane support; 21 miningA sample pump; 22-American MAGEE AE-33 Black carbon Analyzer; 23-TSI particulate analyzer.

Detailed Description

Examples

A diluting device suitable for monitoring the concentration of atmospheric pollutants is characterized by comprising a pre-diluting pipe and a diluting system;

the pre-dilution pipe comprises a circular dilution pipe 1, a high-efficiency filter 2, a fan 3, a pre-dilution pipe outlet flow control valve 5 and CO₂The concentration sensor I4 is characterized in that an introducing port is arranged at the front end of the dilution pipe 1, the introducing port is a fan 3 and a high-efficiency filter 2 when the introducing port is arranged along the air flow inlet direction in sequence, one end of the fan 3 is directly connected with the ambient atmosphere, ambient air is sucked in through negative pressure and passes through the high-efficiency filter 2 to obtain clean air, and the clean air enters the pre-dilution pipe through the introducing port to be fully mixed and diluted with sampling smoke; part of mixed gas enters a dilution system, redundant gas is discharged through an exhaust port at the rear end of a dilution pipe, and an exhaust flow control valve is arranged on a connecting pipeline of the exhaust port;

the diluting system comprises a primary diluting bin 6, a secondary diluting bin 11 and a stopping bin 16; the outlet end of the pre-dilution pipe is connected with the air inlet of the primary dilution bin through a conduit, the primary dilution bin 6 is connected with the secondary dilution bin 11, and the secondary dilution bin 11 is connected with the staying bin 16; a primary clean air inlet 7 is formed in the primary dilution bin 6, a primary clean air inlet pipe is connected to the primary clean air inlet 7, and a primary clean air flow control valve 8 is arranged on the primary clean air inlet pipe; a primary bypass outlet 9 is arranged on the primary dilution bin 6, an air outlet pipe is connected to the primary bypass outlet 9, and a primary bypass air outlet flow control valve 10 is arranged on the air outlet pipe; a secondary clean air inlet 12 is formed in the secondary dilution bin 11, a secondary clean air inlet pipe is connected to the secondary clean air inlet 12, and a secondary clean air flow control valve 13 is arranged on the secondary clean air inlet pipe; CO is arranged on the staying bin 16₂And a concentration sensor II 17.

An absolute pressure sensor 14 and a temperature and humidity sensor 15 are arranged on the stopping bin 16.

When in useThe utility model discloses the connected sampling system comprises an off-line sampling system and an on-line sampling system; the off-line sampling system comprises a sampling port on a staying bin 16 and a plurality of sampling branch pipes 18 connected with the sampling port, wherein a particulate matter cutter 19 and a sampling film support 20 are respectively arranged on the sampling branch pipes 18, and PM can be realized by arranging different cutting heads₁₀、PM_2.5And step sampling, wherein the plurality of sampling branch pipes 18 are connected with a sampling pump 21 to provide power. The online sampling system comprises an American MAGEE AE-33 black carbon analyzer 22 and a TSI particulate matter analyzer 23 which are respectively connected with the staying bin 16 through black carbon sampling pipes.

Claims

1. A diluting device suitable for monitoring the concentration of atmospheric pollutants is characterized by comprising a pre-diluting pipe and a diluting system;

the pre-dilution pipe comprises a circular dilution pipe (1), a high-efficiency filter (2), a fan (3), a pre-dilution pipe gas outlet flow control valve (5), and CO₂The device comprises a concentration sensor I (4), wherein the front end of a dilution pipe (1) is provided with an introducing port, the introducing port is a fan (3) and a high-efficiency filter (2) in sequence along the air flow inlet direction, one end of the fan (3) is directly connected with the ambient atmosphere, the rear end of the dilution pipe (1) is provided with an exhaust port, and a connecting pipeline of the exhaust port is provided with a pre-dilution pipe air outlet flow control valve (5);

the diluting system comprises a primary diluting bin (6), a secondary diluting bin (11) and a stopping bin (16); the outlet end of the pre-dilution pipe is connected with the air inlet of the primary dilution bin through a conduit, the primary dilution bin (6) is connected with the secondary dilution bin (11), and the secondary dilution bin (11) is connected with the staying bin (16); a primary clean air inlet (7) is formed in the primary dilution bin (6), a primary clean air inlet pipe is connected to the primary clean air inlet (7), and a primary clean air flow control valve (8) is arranged on the primary clean air inlet pipe; a primary bypass outlet (9) is arranged on the primary dilution bin (6), an air outlet pipe is connected to the primary bypass outlet (9), and a primary bypass air outlet flow control valve (10) is arranged on the air outlet pipe; the above-mentionedA secondary clean air inlet (12) is formed in the secondary dilution bin (11), a secondary clean air inlet pipe is connected to the secondary clean air inlet (12), and a secondary clean air flow control valve (13) is arranged on the secondary clean air inlet pipe; CO is arranged on the staying bin (16)₂And a concentration sensor II (17).

2. A dilution apparatus adapted for atmospheric pollutant concentration monitoring according to claim 1, wherein the dwell tank (16) is provided with an absolute pressure sensor (14).

3. A dilution apparatus suitable for monitoring the concentration of atmospheric pollutants according to claim 1, wherein the staying cabin (16) is provided with a temperature and humidity sensor (15).

4. The dilution device suitable for monitoring the concentration of atmospheric pollutants according to claim 1, wherein the staying bin (16) is provided with a sampling port, a plurality of sampling branch pipes (18) are connected with the sampling port, a particulate matter cutter (19) and a sampling membrane support (20) are respectively arranged on the sampling branch pipes (18), and PM can be realized by arranging different cutting heads₁₀、PM_2.5And step sampling, wherein the plurality of sampling branch pipes (18) are connected with a sampling pump (21) to provide power.

5. A dilution apparatus suitable for atmospheric pollutant concentration monitoring according to claim 1, wherein the residence tank (16) is connected to a black carbon analyzer (22) and a TSI particulate matter analyzer (23) of MAGEE AE-33, usa through black carbon sampling pipes.