CN217331796U

CN217331796U - Automatic fly ash sampling device suitable for flue gas flow field

Info

Publication number: CN217331796U
Application number: CN202221164637.0U
Authority: CN
Inventors: 张智远; 李耀亮; 王冰礁; 汤凌晓; 詹修平; 李腾旭; 黄学辉; 赵庆林; 李�昊; 林兴铭
Original assignee: Huaneng Luoyuan Power Generation Co Ltd
Current assignee: Huaneng Luoyuan Power Generation Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-08-30
Anticipated expiration: 2032-05-16

Abstract

The utility model relates to a flying ash automatic sampling device suitable for a flue gas flow field, which comprises a plurality of air suction nozzles extending into a flue, wherein the air suction nozzles are connected with a cyclone dust collector which is longitudinally arranged through a sampling tube which is transversely arranged; the top of the cyclone dust collector is connected with a transversely arranged injection pipe extending into the flue through an exhaust elbow, the bottom of the cyclone dust collector is connected with an ash receiving bottle, the lower part of the cyclone dust collector is externally connected with an electric two-way ball valve, one port of the electric two-way ball valve is connected with a mounting hole reserved at the lower part of the cyclone dust collector, and the other port of the electric two-way ball valve is communicated with the external atmosphere; the sampling tube is connected with a back flushing tube, the back flushing tube is connected and communicated with a heater, and the tail end of the back flushing tube is connected with an external compressed air source through a back flushing valve; one end of the sampling tube close to the cyclone dust collector is provided with a heating device for clamping the sampling tube.

Description

Automatic fly ash sampling device suitable for flue gas flow field

Technical Field

The utility model relates to a flying dust sampling device technical field especially relates to automatic sampling device of flying dust suitable for flue gas flow field.

Background

The carbon content of the fly ash of the boiler is an important index for reflecting the combustion efficiency of a coal-fired boiler of a thermal power plant, and the real-time detection of the carbon content of the fly ash is favorable for guiding the operation to correctly adjust the air-coal ratio and improving the combustion control level of the boiler; reasonably controlling the carbon content index of the fly ash, being beneficial to reducing the power generation cost and improving the economical efficiency of the unit operation.

The traditional fly ash sampling device is divided into manual sampling and on-line detection of carbon content in the boiler fly ash, and the manual sampling is relatively poor in representativeness and low in efficiency. On-line measuring device, for example, the grant bulletin number is CN211292209U, the name is the Chinese utility model patent of "flying dust sampler automatic purging device", perhaps grant bulletin number is CN212883013U, the name is the Chinese utility model patent of "an activity power plant boiler flying dust sampling device" flying dust sampling device in all adopt the ejector injection principle to absorb the sampling to the flying dust in the flue is automatic, need not the aspiration pump and get, though improved sampling efficiency, but easy the jam, and sampling device all is in the state of sample always, flying dust sampling device can't take a sample at specific time and specific time length.

In addition, the existing fly ash sampling device is easy to block, and the measured data is not accurate enough. Because the tail flue is provided with the wastewater zero discharge system, the flow field of the flue gas is complex, the water content in the flue gas is high, the sampling tube of the traditional automatic fly ash sampling device is very easy to block, the maintenance workload is large, the sampling tube needs to be cleaned manually at regular intervals, a large amount of manpower and material resources are consumed, and the labor intensity of maintenance personnel is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims to provide an automatic sampling device of flying dust suitable for flue gas flow field solves current manual sampling inefficiency, and the easy stifled ash of sampler, the problem that the maintenance volume is big.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the automatic fly ash sampling device suitable for a flue gas flow field comprises a plurality of air suction nozzles extending into a flue, wherein the air suction nozzles are connected with a cyclone dust collector which is longitudinally arranged through a sampling pipe which is transversely arranged; the top of the cyclone dust collector is connected with a transversely arranged injection pipe extending into the flue through an exhaust elbow, the bottom of the cyclone dust collector is connected with an ash receiving bottle, the lower part of the cyclone dust collector is externally connected with an electric two-way ball valve, one port of the electric two-way ball valve is connected with a mounting hole reserved at the lower part of the cyclone dust collector, and the other port of the electric two-way ball valve is communicated with the external atmosphere; the sampling tube is connected with a back flushing tube, the back flushing tube is connected with a heater, and the tail end of the back flushing tube is connected with an external compressed air source through a back flushing valve; one end of the sampling tube close to the cyclone dust collector is provided with a heating device for clamping the sampling tube.

Furthermore, a plurality of air suction nozzles are respectively connected and communicated with the sampling tube through a connecting bent tube, and the tail end of the sampling tube is connected with a side connector of the cyclone dust collector which is longitudinally arranged through a connector.

Furthermore, a filter screen is arranged on an upper cover of a port of the electric two-way ball valve communicated with the outside atmosphere.

Furthermore, an adjusting nozzle is arranged between the exhaust elbow and the injection pipe.

Furthermore, the blowback pipe is located the top of sampling tube, and the part that blowback pipe and sampling tube are connected is the bend section, and the middle part that is connected with the bend section and transversely extends towards cyclone collector is horizontal section, and other parts that are connected with horizontal section and are on a parallel with cyclone collector longitudinal extension are vertical section, and the heater communicates with vertical section.

Furthermore, the connector of the sampling tube, the transverse section of the blowback tube and the injection tube are fixedly mounted on a connecting plate which is longitudinally arranged.

Further, the exhaust elbow is made of ceramic materials.

Furthermore, the sampling tube is wrapped by two square aluminum blocks of the heating device, and a heating rod is clamped between the sampling tube and the two square aluminum blocks.

Furthermore, the electric two-way ball valve, the heater, the back flushing valve and the heating device are all controlled by a control device.

The utility model discloses following beneficial effect has:

the utility model discloses utilize the inside negative pressure of flue to draw through drawing penetrating the pipe and draw and penetrate, realize unpowered from the drawing formula sample, need not the extraction of outer air pump, improve sampling efficiency. A plurality of suction nozzles extending into the flue are matched with an adjusting nozzle of the injection pipe, sampling is representative, an ash sample passes through the cyclone dust collector, a particle ash sample falls into the ash collecting bottle, and gas and a little fine powder return to the flue from the upper part of the cyclone dust collector through the injection pipe. The opening and closing of the through opening communicated with the atmosphere of the electric two-way ball valve are controlled by the control device, a plurality of different sampling time periods and sampling time periods can be defined by users, automatic sampling time can be set according to operation conditions, sampling interval time can be set freely, the representativeness of ash samples in all the time periods is guaranteed, and the measurement requirements are met. The whole-process heat tracing mode is adopted for the exhaust bent pipe, the exhaust bent pipe is prevented from being blocked due to low temperature, if the exhaust bent pipe is blocked, fly ash entering the cyclone dust collector cannot be discharged into a flue, and the fly ash is accumulated to a large extent, so that serious ash blocking occurs, and sampling is influenced. The back flushing pipe is externally connected with compressed air, so that the back flushing time can be manually set according to the operation requirement. The exhaust bent pipe is made of all ceramic materials, so that the inner ash sample is prevented from being washed away and worn through. The sampling device has an intermittent rapping function, avoids ash sample blockage, and is provided with a vibrating device to prevent fly ash from being bonded on the inner wall.

The electric two-way ball valve is closed by adopting a motor to drive the ball valve, is relatively resistant to voltage impact and is relatively stable. The opening of the electric two-way ball valve has three states of full opening, full closing and half opening and half closing, and can control the flow of a medium in a pipeline. The electric two-way ball valve is relatively large in drift diameter, a filter screen is arranged outside the electric two-way ball valve, the jamming condition can be effectively avoided, the service life is long, the maintenance amount is low, and the stability is good.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the connection structure of the electric two-way ball valve and the cyclone dust collector of the present invention;

fig. 3 is a schematic structural view of the heating device for wrapping and clamping the sampling tube according to the present invention.

Detailed Description

The invention will be described in further detail with reference to the following drawings and specific embodiments:

referring to fig. 1 to 3, the automatic sampling device for fly ash in a flue gas flow field comprises a plurality of air suction nozzles 1 extending into a flue, wherein the air suction nozzles 1 are respectively connected with a transversely arranged sampling pipe 12 through a connecting bent pipe 11, and the tail end of the sampling pipe 12 is connected with a side connecting port of a longitudinally arranged cyclone dust collector 2 through a connecting head 13.

The top connecting port of the cyclone dust collector 2 is connected with a transversely arranged injection pipe 4 extending into the flue through an exhaust elbow 41, and an adjusting nozzle 42 is arranged between the exhaust elbow 41 and the injection pipe 4. The exhaust elbow 41 is made of a ceramic material to prevent clogging due to dust deposition. The lower part of the cyclone dust collector 2 is provided with a vibrator for assisting in discharging ash. And the bottom connector of the cyclone dust collector 2 is connected with an ash receiving bottle 3. The cyclone dust collector 2 lower part is external to have an electronic two-way ball valve 5, one of them opening of electronic two-way ball valve 5 passes through the mounting hole that connecting tube 51 and cyclone dust collector 2 lower part were reserved and is connected, the other opening and the outside atmosphere intercommunication of electronic two-way ball valve 5, the opening upper shield of electronic two-way ball valve 5 and outside atmosphere intercommunication is equipped with filter screen 52.

One end of the sampling pipe 12 close to the cyclone dust collector 2 is connected with a blowback pipe 6, the blowback pipe 6 is positioned above the sampling pipe 12, the part of the blowback pipe 6 connected with the sampling pipe 12 is a bent pipe section 61, the part of the blowback pipe connected with the bent pipe section 61 and extending transversely towards the cyclone dust collector 2 is a transverse section 62, and the other part connected with the transverse section 62 and extending longitudinally parallel to the cyclone dust collector 2 is a longitudinal section 63. The longitudinal section 63 of the back-blowing pipe 6 is connected and communicated with a heater 64, and the tail end of the back-blowing pipe is connected with an external compressed air source through a back-blowing valve.

The sampling tube 12 is located the part between blowback pipe 6 and the sampling tube 12 junction and the connector 13 and is provided with heating device 7, heating device 7 includes two square aluminium pig 71 and heating rod, and two square aluminium pig 71 inboards all set up the recess that can encase sampling tube 12, and two square aluminium pig 71 encase clamp sampling tube 12, press from both sides between sampling tube 12 and two square aluminium pig 71 and establish the heating rod. The heating rod and heater 64 are connected to a power source through a power base 72.

The connector 13 of the sampling tube 12, the transverse section 62 of the blowback tube 6 and the injection tube 4 are all fixedly arranged on a connecting plate 100 which is longitudinally arranged.

The electric two-way ball valve 5, the heater 64, the heating rod and the blowback valve are all controlled by a control device. When the sampling device samples, the control device controls the electric two-way ball valve 5 to close the through port communicated with the external atmosphere, and because the inside of the flue is negative pressure, flue gas is automatically sucked into the cyclone dust collector 2 from the plurality of suction nozzles 1, fly ash falls into the ash collecting bottle 3, and gas and a little fine powder return to the flue through the injection pipe 4. After the sampling is finished, the control device controls the electric two-way ball valve 5 to open the through hole communicated with the external atmosphere, the cyclone dust collector 2 is communicated with the external atmosphere, the sampling is stopped, the electric two-way ball valve 5 is controlled by the control device to open and close the through hole communicated with the atmosphere, and the timing sampling and the sampling time length control can be realized. The back-flushing valve and the heater 64 are opened at regular time, and the pipeline 6 is back-flushed by an external compressed air source to prevent blockage. The heating device heats in the whole process, and ash blockage caused by over-low temperature is prevented.

The above only is the detailed implementation manner of the present invention, not limiting the patent scope of the present invention, all the equivalent structure changes made in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. Automatic sampling device of flying dust suitable for flue gas flow field, its characterized in that: comprises a plurality of air suction nozzles (1) extending into a flue, wherein the air suction nozzles (1) are connected with a cyclone dust collector (2) which is longitudinally arranged through a sampling tube (12) which is transversely arranged; the top of the cyclone dust collector (2) is connected with a transversely-arranged injection pipe (4) extending into the flue through an exhaust bent pipe (41), the bottom of the cyclone dust collector (2) is connected with an ash receiving bottle (3), the lower part of the cyclone dust collector (2) is externally connected with an electric two-way ball valve (5), one through opening of the electric two-way ball valve (5) is connected with a mounting hole reserved at the lower part of the cyclone dust collector (2), and the other through opening of the electric two-way ball valve (5) is communicated with the external atmosphere; the sampling tube (12) is connected with a back flushing tube (6), the back flushing tube (6) is communicated with a heater (64), and the tail end of the back flushing tube (6) is connected with an external compressed air source through a back flushing valve; one end of the sampling tube (12) close to the cyclone dust collector (2) is provided with a heating device (7) which clamps the sampling tube (12).

2. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 1, characterized in that: the plurality of air suction nozzles (1) are respectively connected with the sampling tube (12) through a connecting bent tube (11), and the tail end of the sampling tube (12) is connected with a side connector of the cyclone dust collector (2) through a connector (13).

3. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 1, characterized in that: and a filter screen (52) is arranged on the port upper cover of the electric two-way ball valve (5) communicated with the external atmosphere.

4. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 1, characterized in that: an adjusting nozzle (42) is arranged between the exhaust elbow (41) and the injection pipe (4).

5. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 2, characterized in that: the back flushing pipe (6) is arranged above the sampling pipe (12), the part of the back flushing pipe (6) connected with the sampling pipe (12) is a bent pipe section (61), the part of the back flushing pipe (6) connected with the bent pipe section (61) and extending towards the transverse direction of the cyclone dust collector (2) is a transverse section (62), the other part of the back flushing pipe connected with the transverse section (62) and extending parallel to the longitudinal direction of the cyclone dust collector (2) is a longitudinal section (63), and the heater (64) is communicated with the longitudinal section (63).

6. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 5, characterized in that: the connector (13) of the sampling tube (12), the transverse section (62) of the blowback tube (6) and the injection tube (4) are all fixedly arranged on a connecting plate (100) which is longitudinally arranged.

7. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 1, characterized in that: the exhaust manifold (41) is made of a ceramic material.

8. An automatic sampling device for fly ash suitable for a flue gas flow field according to claim 1, wherein: the sampling tube (12) is wrapped by two square aluminum blocks (71) of the heating device (7), and a heating rod is clamped between the sampling tube (12) and the two square aluminum blocks (71).

9. An automatic sampling device of fly ash suitable for flue gas flow field according to claim 1, characterized in that: the electric two-way ball valve (5), the heater (64), the blowback valve and the heating device (7) are all controlled by a control device.