CN219284764U

CN219284764U - Device for improving on-line monitoring precision of inorganic elements in flue gas

Info

Publication number: CN219284764U
Application number: CN202223454379.2U
Authority: CN
Inventors: 罗武文; 张倩暄; 秦海潮; 王海同; 李四寿; 李�杰
Original assignee: Beijing SDL Technology Co Ltd
Current assignee: Beijing SDL Technology Co Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-30
Anticipated expiration: 2032-12-23

Abstract

The utility model belongs to the technical field of flue gas online monitoring. The utility model provides a device for improving the on-line monitoring precision of inorganic elements in flue gas, which comprises: the device comprises a particulate matter sampling device, a flow detection and adjustment unit, a jet pump, an electromagnetic three-way valve, a flue gas sampling pipeline, an aqueous solution funnel, an electromagnetic ball valve and a transmission drying detection unit; the particulate sampling device, the flow detection and adjustment unit, the jet pump, the electromagnetic three-way valve, the smoke sampling pipeline, the water solution funnel and the electromagnetic ball valve are connected through pipelines in sequence; the transmission drying detection unit is arranged below the solid outlet of the electromagnetic ball valve. The device disclosed by the utility model is energy-saving, environment-friendly and high in accuracy.

Description

Device for improving on-line monitoring precision of inorganic elements in flue gas

Technical Field

The utility model belongs to the technical field of online monitoring of flue gas, and particularly relates to the technical field of continuous sampling and measuring of inorganic elements in flue gas.

Background

Heavy metal becomes secondary NO _x 、SO ₂ And the other large pollutant after dust is the main emission source of the heavy metal in the flue gas in the industries of coal-fired power stations, metal smelting, coal chemical industry and the like, and the on-line monitoring of the concentration of the heavy metal in the flue gas is of great significance in realizing the emission reduction of the heavy metal in the flue gas. The current common method for on-line monitoring of inorganic elements (containing heavy metals) in flue gas comprises the following steps: for monitoring gaseous mercury, an atomic absorption mode is adopted for measurement; for multi-element monitoring, XRF method, ICP-AES, ICP-MS and other methods are adopted.

The existing common online monitoring method is that an XRF module is adopted for an analysis unit, so that multiple elements can be detected simultaneously, the speed is high, and the structure is simple.

In the current method for online monitoring by adopting the XRF principle, the following defects exist: (1) The adsorption of the sampling pipeline can cause the loss of particulate matters, so that the measurement result is distorted; (2) The sampling pipeline needs to be heated or condensed, so that the energy consumption of the system is increased; (3) Poor sample homogeneity, resulting in poor measurement accuracy;

in the patent or literature, an analysis unit in an online monitoring device adopts ICP-AES or ICP-MS, and the device is complicated and needs to digest a sample to analyze. Systems employing methods such as ICP-AES/ICP-MS or absorption fluids suffer from the following disadvantages: (1) The adsorption of the sampling pipeline can cause the loss of particulate matters, so that the measurement result is distorted;

(2) The absorption of the absorption liquid is incomplete or the digestion process is complex and takes a long time; (3) The ICP-AES/ICP-MS analyzer needs to be provided with relevant gases, has high environmental requirements, is easy to break down when being used on site, and is not suitable for on-site online analysis.

Disclosure of Invention

In view of the above, the present utility model provides a device for improving the on-line monitoring precision of inorganic elements in flue gas, comprising: the device comprises a particulate sampling device, a flow detection and adjustment unit, a jet pump, an electromagnetic three-way valve, a flue gas sampling pipeline, an aqueous solution funnel, an electromagnetic ball valve and a transmission drying detection unit; the particulate sampling device, the flow detection and regulation unit, the jet pump, the electromagnetic three-way valve, the smoke sampling pipeline, the water solution funnel and the electromagnetic ball valve are connected through pipelines in sequence; the transmission drying detection unit comprises a filter membrane, a drying device, an XRF detection unit, a supply reel, a take-up reel, a positioning wheel, a sealing ring and a lifting pressure head; the filter membrane is arranged right below the liquid outlet of the electromagnetic ball valve. A pressure head lifting device is arranged below the filter membrane, a sealing ring is arranged above the pressure head, and the filter membrane can be clamped between the sealing ring and a water outlet below the electromagnetic ball valve by lifting the pressure head; after the filter membrane is clamped, the electromagnetic ball valve is opened, a passage is formed between the water solution funnel and the water tank, and the water solution in the funnel flows back to the water tank after being filtered by the filter membrane; the liquid level detector is used for detecting the height of the liquid level in the funnel, and after the liquid level is reduced to zero, the electromagnetic ball valve is closed, and the filter membrane is filtered; after the filter membrane filters the aqueous solution, a circular particle spot is formed on the filter membrane, the particle spot is conveyed to the lower part of the drying device through the conveying and drying detection unit, and the particle spot is continuously conveyed to the lower part of the XRF detection unit after being dried for detection and analysis of the collected particle spot;

in a specific embodiment of the utility model, the water treatment device further comprises a water treatment unit; the water treatment unit comprises a water tank, a water filter and a water suction pump which are sequentially connected through pipelines; the water outlet at the bottom of the water tank is communicated with the water filter through a pipeline, and the water inlet at the upper part of the water tank is communicated with the liquid outlet of the electromagnetic ball valve through a pipeline in combination with the lifting operation of the pressure head lifting device; one end of the water suction pump is communicated with the water filter through a pipeline, and the other end of the water suction pump is communicated with the electromagnetic three-way valve through a pipeline.

The device provided by the utility model is energy-saving, environment-friendly and high in accuracy.

Drawings

FIG. 1 is a diagram of a device for improving the on-line monitoring precision of inorganic elements in flue gas.

The device comprises a particulate sampling device 1, a flow detection and adjustment unit 2, a jet pump 3, an electromagnetic three-way valve 4, a flue gas sampling pipeline 5, a liquid level detector 6, an exhaust device 7, an aqueous solution funnel 8, an electromagnetic ball valve 9, a drying device 10, an XRF detection unit 11, a filter membrane 12, a positioning wheel 13, a receiving disc 14, a sealing ring 15, a lifting pressure head 16, a supply disc 17, a water supplementing electromagnetic valve 18, a water tank 19, a water filter 20 and a circulating water pump 21.

Detailed Description

Examples

The device for improving the on-line monitoring precision of the inorganic elements in the smoke comprises a particulate matter sampling device, a flow detection and adjustment unit, a jet pump, an electromagnetic three-way valve, a smoke sampling pipeline, an aqueous solution funnel, an electromagnetic ball valve, a transmission drying detection unit and a water treatment unit, wherein the particulate matter sampling device, the flow detection and adjustment unit, the jet pump, the electromagnetic three-way valve, the smoke sampling pipeline, the aqueous solution funnel and the electromagnetic ball valve are sequentially connected through pipelines, the transmission drying detection unit comprises a filter membrane, a drying device, an XRF detection unit, a supply reel, a take-up reel, a positioning wheel, a sealing ring and a lifting pressure head, and the water treatment unit comprises a water tank, a water filter and a water suction pump which are sequentially connected through pipelines.

The top of the aqueous solution funnel is also provided with an exhaust device and a liquid level detector.

And a sealing ring is arranged at the top of the lifting pressure head.

The filter membrane of the transmission drying detection unit is arranged between the electromagnetic ball valve liquid outlet and the sealing ring, and liquid from the electromagnetic ball valve liquid outlet flows onto the filter membrane, and after being filtered and remained on the filter membrane, the solid is transmitted to the drying device for drying and then is detected by the XRF detection unit.

The water outlet at the bottom of the water tank is communicated with the water filter through a pipeline, the water inlet at the upper part of the water tank is communicated with the lifting pressure head through a pipeline and is positioned right below the liquid outlet of the electromagnetic ball valve, and the liquid of the water solution funnel enters the water tank through the liquid outlet of the electromagnetic ball valve, the lifting pressure head and the pipeline; and a water supplementing port is further arranged at the top of the water tank.

One end of the water suction pump is communicated with the water filter through a pipeline, and the other end of the water suction pump is communicated with the electromagnetic three-way valve through a pipeline.

The method for improving the on-line monitoring precision of the inorganic elements in the flue gas mainly comprises the following steps:

1. firstly, an electromagnetic ball valve is set to be closed, an electromagnetic three-way valve is communicated with a flue gas pipeline and a water suction pump to realize switching to a water suction passage, then the water suction pump is opened to store water in an aqueous solution funnel, and the water suction pump is closed after a liquid level detector detects that a horizontal plane passes through an exhaust port of the flue gas pipeline;

an electromagnetic three-way valve is arranged to communicate a flue gas pipeline with a water suction pump, the flue gas pipeline is switched to a sampling passage, and the flue gas is extracted at constant speed for a certain time (for example, 10 minutes);

2. after sampling is finished, an electromagnetic three-way ball valve is arranged to communicate a flue gas pipeline with a water suction pump, the water suction pump is switched to a water suction passage again, water is injected into a flue gas sampling pipe for 5 minutes, a gas circuit pipe is cleaned, the water suction pump is closed, and finally all particulate matters contained in gas exhausted for 10 minutes are collected in the water solution;

3. after the water suction pump is closed, the lifting pressure head is lifted, and the filter membrane is clamped between liquid outlets below the electromagnetic ball valve through a sealing ring at the top of the lifting pressure head;

then opening the electromagnetic ball valve, and leading the liquid in the water solution funnel to flow into the water tank after being filtered by the filter membrane; after the liquid level detector detects that the liquid level in the funnel drops to zero, the particles filtered by the filter membrane form a circular spot after the water solution is filtered

4. After forming particulate matter spots, the filter membrane conveying device firstly conveys the spots to the lower side of the drying device for spot drying, and then conveys the spots to the lower side of the XRF detection unit for detection analysis;

5. repeating the above process to form continuous on-line monitoring.

According to the device and the method, the air outlet of the sampling pipe is immersed in the funnel water solution, so that the particles are completely sampled, and meanwhile, the pipeline is not required to be heated at high temperature or cooled to remove water, so that the energy consumption is obviously reduced; meanwhile, the water solution can enable particles to be uniformly enriched on the filter membrane, so that analysis and detection precision is improved. The cleaning mode change, the liquid change and the analysis unit principle change of the pipeline which are extended on the basis are all within the scope of the utility model patent.

As shown in the following table, the method of the utility model measures the mass concentration of inorganic elements in the total exhaust particulate matters of a certain smelting plant, and simultaneously performs comparison test by using a manual sampling standard method and a conventional XRF analysis method. Taking manganese, iron, copper, zinc and lead as examples, the data measured by the method and the method are closer to the manual standard method, and the deviation of the conventional XRF analysis method and the manual standard method is more than 20%, so that the data is distorted.

Claims

1. Device for improving on-line monitoring precision of inorganic elements in flue gas, which is characterized by comprising:

the device comprises a particulate matter sampling device, a flow detection and regulation unit, a jet pump, an electromagnetic three-way valve, a flue gas sampling pipeline, an aqueous solution funnel, an electromagnetic ball valve and a transmission drying detection unit;

the particulate sampling device, the flow detection and adjustment unit, the jet pump, the electromagnetic three-way valve, the smoke sampling pipeline, the water solution funnel and the electromagnetic ball valve are connected through pipelines in sequence;

the transmission drying detection unit is arranged below the solid outlet of the electromagnetic ball valve.

2. The device for improving the on-line monitoring precision of inorganic elements in flue gas according to claim 1, further comprising a water treatment unit;

the water treatment unit comprises a water tank, a water filter and a water suction pump which are sequentially connected through pipelines;

the water outlet at the bottom of the water tank is communicated with the water filter through a pipeline, and the water inlet at the upper part of the water tank is communicated with the liquid outlet of the electromagnetic ball valve through a pipeline;

3. The device for improving the on-line monitoring precision of the inorganic elements in the flue gas according to claim 1, wherein the transmission drying detection unit comprises a filter membrane, a drying device, an XRF detection unit, a supply reel, a take-up reel, a positioning wheel, a sealing ring and a lifting pressure head;

the top of the lifting pressure head is provided with a sealing ring;

the filter membrane is arranged between the liquid outlet of the electromagnetic ball valve and the sealing ring.