CN211235397U

CN211235397U - Automatic sampling pulverized coal fineness on-line measuring device

Info

Publication number: CN211235397U
Application number: CN201921857867.3U
Authority: CN
Inventors: 李庆松
Original assignee: Shandong Xuguang Derui New Material Co ltd
Current assignee: Shandong Xuguang Derui New Material Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-11
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses an automatic sampling coal powder fineness on-line measuring device, which comprises a coal powder pipeline and an electric shutoff valve arranged on the coal powder pipeline; a measuring pipe is fixed on the coal powder pipeline at the upper side of the electric shutoff valve; the measuring pipe is connected to a first temporary storage hopper at an upper position through a first air pump; the bottom of the first temporary storage hopper is provided with a weighing hopper; at least one electric sieve is arranged at the bottom of the weighing hopper; a material receiving platform is respectively arranged below the discharge hopper of the electric sieve; a middle weighing hopper is movably arranged on the receiving platform; the utility model discloses an automatic sample buggy fineness on-line measuring device can automatic sample and fineness analysis, and the sample gets back to the buggy pipeline and is undulant, and during buggy on-line measuring, can guarantee that buggy pipeline feed normally goes on.

Description

Automatic sampling pulverized coal fineness on-line measuring device

Technical Field

The utility model relates to a fineness monitoring devices, automatic sample buggy fineness on-line measuring device belongs to fineness monitoring devices technical field.

Background

The detection of the particle size of the pulverized coal is a particularly important part for detecting combustion parameters of thermal power generation, and the detection result not only directly influences the combustion stability and safety of the pulverized coal particles in a boiler, but also has close relation with the improvement of the combustion efficiency of the pulverized coal, the reduction of the emission of pollution gas and the reduction of the emission; the existing on-line coal powder fineness detection equipment has single type, such as Chinese patent application number: 201721469712.3 an automatic sampling coal powder fineness on-line measuring device, comprising: the sampling mechanism comprises: collecting pulverized coal particles in a pulverized coal pipeline, wherein one end of the sampling gun extends into the pulverized coal pipeline; air exhaust mechanism: pumping the pulverized coal particles in the pulverized coal pipeline into a sampling tube of the sampling gun, wherein the pumping pressure can change the pulverized coal flow rate in the sampling tube, so that the pulverized coal flow rate in the pulverized coal pipeline is equal to the pulverized coal flow rate in the sampling tube; coal dust particle processing mechanism: processing the collected coal dust particles into coal dust fluid with a thin surface falling; the image acquisition mechanism: the coal powder fineness distribution analysis device is arranged below coal powder fluid falling from a thin surface, pictures of coal powder particles falling from the thin surface are shot and stored, and the distribution of particle sizes is calculated from the collected pictures, so that the coal powder fineness distribution is analyzed; coal dust recovery mechanism: and recovering the coal dust particles collected by the image collecting mechanism to the raw coal dust pipeline. The utility model can measure the fineness of the pulverized coal on line in real time, does not need people to participate in the detection, saves time and labor, has high measuring precision and pollution resistance, and can be used for a long time; however, the structure is complex, especially the coal powder fineness distribution is analyzed by calculating the particle size distribution from the collected images, a complex calculation process is needed, and for the coal powder fineness, the ratio of large particles to small particles or the ratio of large particles, medium particles and small particles is generally required to be monitored, and obviously, the complex calculation is not needed.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an automatic sample buggy fineness on-line measuring device can automatic sample and fineness analysis, during the monitoring, can guarantee that the feed normally goes on.

The utility model discloses an automatic sample buggy fineness on-line measuring device, through improving current buggy pipeline, the shut-off valve concatenates on the pipeline, and set up second way buggy feeding route below the shut-off valve, set up the sample route simultaneously above the shut-off valve, take a sample through the sample route, and send into total weighing equipment to the sample, acquire the total amount through total weighing equipment, and send into screening equipment with the sample, sieve through screening equipment, obtain at least oversize sample and undersize sample, and respectively to oversize sample and undersize sample ratio analysis, confirm buggy fineness, the buggy that accomplishes the screening is sent into second way buggy feeding route through the feed back pipe and is kept in, wait for second way buggy feeding route to send into the buggy pipeline; the concrete structure is as follows: comprises a pulverized coal pipeline and an electric shutoff valve arranged on the pulverized coal pipeline; a measuring pipe is fixed on the coal powder pipeline at the upper side of the electric shutoff valve; the measuring pipe is connected to a first temporary storage hopper at an upper position through a first air pump; the bottom of the first temporary storage hopper is provided with a weighing hopper; at least one electric sieve is arranged at the bottom of the weighing hopper; the screen inside the electric screen is an electroforming screen or a wire mesh screen, so that high-precision screening is realized; a material receiving platform is respectively arranged below the discharge hopper of the electric sieve; a middle weighing hopper is movably arranged on the receiving platform; the top of the middle hopper is sealed, and a material guide pipe is communicated with the discharge hopper of the electric sieve; a material return pipe is arranged on the side part of the middle weighing hopper; the feed back pipe is connected to a second temporary storage hopper through a second air pump; a feed-back feeding mechanism is arranged at the bottom of the second temporary storage hopper; the discharge end of the feed back feeding mechanism is connected to the lower part of an electric shutoff valve of the pulverized coal pipeline; an exhaust net is arranged on the side parts of the first temporary storage hopper and the second temporary storage hopper; the first temporary storage hopper and the second temporary storage hopper are fixed with cyclone dust collectors outside the exhaust net; the cyclone removes dust with dusty air current, and the buggy enters into first hopper and the second hopper of keeping in temporarily, falls through the dead weight, realizes the vacuum unloading.

Further, the driving end of the electric shutoff valve is electrically connected with a fineness monitoring PLC; the first air pump, the electric sieve, the second air pump, the feed back feeding mechanism and the cyclone dust collector are electrically connected to a power supply through a normally open relay; the normally open relay is electrically connected to the fineness monitoring PLC; when the device works, the fineness monitoring PLC firstly opens a normally open relay of the feed back feeding mechanism, after the time delay is 1-1.5 s, a drive end signal is given to the electric shutoff valve, so that the electric shutoff valve is closed, after the time delay is 1-1.5 s, a relay of the first air pump is opened, after the time delay is 5s, a relay of the first air pump is closed, a normally open relay of the feed back feeding mechanism is closed, after the time delay is 0.5-1 s, a reverse signal is given to the electric shutoff valve, the electric shutoff valve is opened, a coal powder pipeline normally supplies materials, after the electric shutoff valve is opened, a weighing hopper obtains the total weight of a sample, and a bottom feed valve is opened; the electric sieve carries out sieving operation; after 8-10 s of time delay, the screening material of collection is weighed to middle weighing hopper, acquires the weighing data to obtain the fineness proportion, then, the screening buggy carries out the feed-back to the second hopper of keeping in through the second air extractor, stops after 8-10 s of second air extractor time delay, accomplishes the buggy fineness measurement of a beat.

Furthermore, the weighing hopper and the middle weighing hopper are online weighing hoppers, are in communication connection with the PLC, directly perform online measurement and feed data back to the PLC, and the PLC directly obtains weighing data and proportion and weighing loss.

Preferably, the feed back feeding mechanism is a screw feeding mechanism, and pressure fluctuation of the pulverized coal pipeline cannot be caused by screw feeding.

The utility model is compared with the prior art, the utility model discloses an automatic sample buggy fineness on-line measuring device can automatic sample and fineness analysis, and the sample gets back to the buggy pipeline and does not have undulant, and during buggy on-line measuring, can guarantee that buggy pipeline feed normally goes on.

Drawings

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

Fig. 2 is a schematic diagram of the electric control flow structure of the present invention.

Detailed Description

Example 1:

the automatic sampling pulverized coal fineness on-line measuring device shown in fig. 1 and fig. 2 is characterized in that an existing pulverized coal pipeline is improved, a shut-off valve is connected on the pipeline in series, a second pulverized coal feeding path is arranged below the shut-off valve, a sampling path is arranged above the shut-off valve, sampling is carried out through the sampling path, a sampling sample is sent to a total weighing device, the total amount is obtained through the total weighing device, the sample is sent to a screening device, screening is carried out through the screening device, at least an oversize sample and an undersize sample are obtained, the oversize sample and the undersize sample are respectively subjected to proportion analysis, the pulverized coal fineness is determined, the screened pulverized coal is sent to the second pulverized coal feeding path through a return pipe to be temporarily stored, and the second pulverized coal feeding path is sent to the pulverized coal pipeline; the concrete structure is as follows: comprises a pulverized coal pipeline 1 and an electric shutoff valve 2 arranged on the pulverized coal pipeline; a measuring pipe 3 is fixed on the coal powder pipeline 1 at the upper side of the electric shutoff valve; the measuring tube 3 is connected to an upper, first temporary storage hopper 5 by means of a first air extractor 4; the bottom of the first temporary storage hopper 5 is provided with a weighing hopper 6; at least one electric sieve 7 is arranged at the bottom of the weighing hopper 6; the screen inside the electric sieve 7 is an electroforming sieve or a wire mesh sieve, so that high-precision screening is realized; a material receiving platform 8 is respectively arranged below the discharge hopper of the electric sieve 7; a middle weighing hopper 9 is movably arranged on the receiving platform 8; the top of the intermediate hopper 9 is sealed, and a material guide pipe 10 is communicated with the discharge hopper of the electric sieve 7; a material return pipe 11 is arranged on the side part of the middle weighing hopper 9; the feed back pipe 11 is connected to a second temporary storage hopper 13 through a second air pump 12; a feed-back feeding mechanism 14 is arranged at the bottom of the second temporary storage hopper 13; the discharge end of the feed back and feeding mechanism 14 is connected to the lower part of the electric shutoff valve 2 of the pulverized coal pipeline 1; the side parts of the first temporary storage hopper 5 and the second temporary storage hopper 13 are provided with an exhaust net; the first temporary storage hopper 5 and the second temporary storage hopper 13 are fixed with a cyclone dust collector 15 outside the exhaust net; the cyclone removes dust with dusty air current, and the buggy enters into first hopper and the second hopper of keeping in temporarily, falls through the dead weight, realizes the vacuum unloading.

The driving end of the electric shutoff valve 2 is electrically connected with a fineness monitoring PLC 15; the first air pump 4, the electric screen 7, the second air pump 12, the feed back feeding mechanism 14 and the cyclone dust collector 16 are electrically connected to a power supply through a normally open relay 17; the normally open relay 17 is electrically connected to the fineness monitoring PLC 15; when the device works, the fineness monitoring PLC firstly opens a normally open relay of the feed back feeding mechanism, after the time delay is 1-1.5 s, a drive end signal is given to the electric shutoff valve, so that the electric shutoff valve is closed, after the time delay is 1-1.5 s, a relay of the first air pump is opened, after the time delay is 5s, a relay of the first air pump is closed, a normally open relay of the feed back feeding mechanism is closed, after the time delay is 0.5-1 s, a reverse signal is given to the electric shutoff valve, the electric shutoff valve is opened, a coal powder pipeline normally supplies materials, after the electric shutoff valve is opened, a weighing hopper obtains the total weight of a sample, and a bottom feed valve is opened; the electric sieve carries out sieving operation; after 8-10 s of time delay, the screening material of collection is weighed to middle weighing hopper, acquires the weighing data to obtain the fineness proportion, then, the screening buggy carries out the feed-back to the second hopper of keeping in through the second air extractor, stops after 8-10 s of second air extractor time delay, accomplishes the buggy fineness measurement of a beat.

The weighing hopper 6 and the middle weighing hopper 9 are online weighing hoppers, are in communication connection with a PLC (programmable logic controller), directly perform online measurement and feed data back to the PLC, and the PLC directly obtains weighing data and proportion and weighing loss.

The feed back feeding mechanism 14 is a screw feeding mechanism, and pressure fluctuation of the pulverized coal pipeline cannot be caused by screw feeding.

The above-mentioned embodiment is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles of the present invention are included in the claims of the present invention.

Claims

1. The utility model provides an automatic online measuring device of buggy fineness of taking a sample which characterized in that: comprises a pulverized coal pipeline and an electric shutoff valve arranged on the pulverized coal pipeline; a measuring pipe is fixed on the coal powder pipeline at the upper side of the electric shutoff valve; the measuring pipe is connected to a first temporary storage hopper at an upper position through a first air pump; the bottom of the first temporary storage hopper is provided with a weighing hopper; at least one electric sieve is arranged at the bottom of the weighing hopper; a material receiving platform is respectively arranged below the discharge hopper of the electric sieve; a middle weighing hopper is movably arranged on the receiving platform; the top of the middle weighing hopper is sealed, and a material guide pipe is communicated with the discharge hopper of the electric sieve; a material return pipe is arranged on the side part of the middle weighing hopper; the feed back pipe is connected to a second temporary storage hopper through a second air pump; a feed-back feeding mechanism is arranged at the bottom of the second temporary storage hopper; the discharge end of the feed back feeding mechanism is connected to the lower part of an electric shutoff valve of the pulverized coal pipeline; an exhaust net is arranged on the side parts of the first temporary storage hopper and the second temporary storage hopper; and the first temporary storage hopper and the second temporary storage hopper are fixedly provided with cyclone dust collectors outside the exhaust net.

2. The automatic sampling pulverized coal fineness on-line measuring device according to claim 1, characterized in that: the driving end of the electric shutoff valve is electrically connected with the fineness monitoring PLC; the first air pump, the electric sieve, the second air pump, the feed back feeding mechanism and the cyclone dust collector are electrically connected to a power supply through a normally open relay; the normally open relay is electrically connected to the fineness monitoring PLC.

3. The automatic sampling pulverized coal fineness on-line measuring device according to claim 1, characterized in that: the weighing hoppers and the intermediate weighing hopper are online weighing hoppers which are communicatively connected to the PLC.

4. The automatic sampling pulverized coal fineness on-line measuring device according to claim 1, characterized in that: the feed back feeding mechanism is a screw feeding mechanism.