CN111504710B - Compact coal powder sampling and diluting device - Google Patents
Compact coal powder sampling and diluting device Download PDFInfo
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- CN111504710B CN111504710B CN202010376661.XA CN202010376661A CN111504710B CN 111504710 B CN111504710 B CN 111504710B CN 202010376661 A CN202010376661 A CN 202010376661A CN 111504710 B CN111504710 B CN 111504710B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
- G01N2001/1418—Depression, aspiration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
- G01N2001/383—Diluting, dispersing or mixing samples collecting and diluting in a flow of liquid
Abstract
The invention discloses a compact coal powder sampling and diluting device, which comprises: the device comprises a sampling gun, a cyclone separator, a collecting tank, a gas analyzer and a gas source; the sampling gun extends into the pulverized coal pipeline, and gas in the gas source enters the sampling gun to generate a pumping effect to pump and dilute pulverized coal flow in the pipeline; the diluted coal dust flow leaves the sampling gun and enters a cyclone separator, and coal dust particles and exhaust gas are generated through separation; the coal dust particles are collected by a collecting tank, the exhaust gas part is sent back to a coal dust pipeline through a sampling gun, and part of the exhaust gas enters a gas analyzer, and the gas analyzer analyzes gas composition parameters of the exhaust gas so as to calculate the sampling speed of the sampling gun; and when the calculated sampling speed is not consistent with the wind speed in the pulverized coal pipeline, adjusting the sampling speed of the sampling gun by adjusting the gas source. The device solves the problems of complex system and easy blockage of a pressure measuring hole and a pipe in the existing coal powder constant-speed sampling, realizes the simultaneous dilution and blockage prevention of the coal powder constant-speed sampling, and has the characteristics of compactness and portability.
Description
Technical Field
The invention relates to the field of power plant pulverized coal particle fineness measurement, in particular to a compact pulverized coal sampling and diluting device.
Background
The fineness of the pulverized coal in the coal-fired power plant has important influence on the economy, the environmental protection and the safety of the operation of a boiler in the power plant and is one of important indexes of the operation of the boiler. The monitoring of the fineness of the coal dust is the basis for optimizing operation and realizing energy conservation and emission reduction, and the measurement of the fineness of the coal dust is mainly an off-line method such as a screening method, a microscopy method, a sedimentation method and the like at present. For a direct-fired pulverizing system, the offline measurement of the fineness of the pulverized coal firstly needs to sample the pulverized coal in the pipeline, and the sampling follows the constant-speed sampling principle, namely the sampling speed is equal to the air speed in the pipeline. If the sampling speed is higher than the wind speed in the pipeline, the obtained coal powder is thinner; if the sampling speed is lower than the wind speed in the pipeline, the obtained pulverized coal is coarse; the sampling speed is equal to the wind speed in the pipeline, and the fineness of the obtained pulverized coal is consistent with that in the pipeline and is representative.
The existing coal powder constant-speed sampling method generally utilizes an external negative pressure generator, and the system is relatively complex. For example, chinese patent No. CN207336148U discloses a coal powder constant-speed sampling device, which comprises a negative pressure pumping mechanism: the coal powder sampling device is used for pumping coal powder in a coal powder pipeline into an inner cavity of a sampling pipe and comprises an air pumping pipe, and an air extractor is arranged between the air pumping pipe and the sampling pipe; the sampling and collecting mechanism comprises: the coal powder collecting device is used for collecting coal powder entering the sampling pipe; the electrostatic speed measuring mechanism: the device is used for measuring the flow velocity of pulverized coal in a pulverized coal pipeline and the flow velocity of pulverized coal pumped into a sampling pipe; PID adjustment mechanism: the sampling tube is used for adjusting the air pumping pressure in the sampling tube, so that the pulverized coal flow velocity in the pulverized coal pipeline is equal to the pulverized coal flow velocity in the sampling tube. The constant-speed sampling is realized according to the principle that when the static pressure in the sampling gun pipe is equal to (or slightly larger than) the static pressure in the pulverized coal pipeline, the sampling speed is equal to the wind speed in the pipeline according to the Bernoulli equation, so that two pressure measuring holes are required to be opened in the sampling gun, and the pressure measuring Kong Jiyi is blocked due to the physical properties of pulverized coal, so that the sampling error is caused. And because of the lack of dilution, the high concentration coal dust flow is also prone to blockage problems within the sampling gun.
Disclosure of Invention
The invention aims to provide a compact coal powder sampling and diluting device, which solves the problems of complex system and easy blockage of a pressure measuring hole and a pipe in the existing coal powder constant-speed sampling.
The invention provides the following technical scheme:
a compact coal dust sampling dilution device comprises: the device comprises a sampling gun, a cyclone separator, a collecting tank, a gas analyzer and a gas source; the sampling gun extends into the pulverized coal pipeline, and gas in the gas source enters the sampling gun to generate a pumping effect to pump and dilute pulverized coal flow in the pipeline; the diluted coal dust flow leaves the sampling gun and enters a cyclone separator, and coal dust particles and exhaust gas are generated through separation; the coal dust particles are collected by a collecting tank, the exhaust gas part is sent back to a coal dust pipeline through a sampling gun, and part of the exhaust gas enters a gas analyzer, and the gas analyzer analyzes gas composition parameters of the exhaust gas so as to calculate the sampling speed of the sampling gun; and when the calculated sampling speed is not consistent with the wind speed in the pulverized coal pipeline, adjusting the sampling speed of the sampling gun by adjusting the gas source.
The sampling gun comprises a gun head, an inner tube, an outer tube and a return tube, wherein the gun head is communicated with one end of the inner tube, the other end of the inner tube is communicated with the cyclone separator, the outer tube is communicated with an air source, and the return tube is communicated with the cyclone separator. The gas in the gas source enters the outer pipe to generate a pumping effect, the gun head sucks the coal dust in the coal dust pipeline, then the coal dust enters the cyclone separator through the inner pipe, and the separated exhaust gas is sent into the coal dust pipeline through the return pipe.
The gun head comprises a bent pipe section, a straight pipe section and a gradually expanding pipe section, wherein the expansion angle of the gradually expanding pipe section is 30-60 degrees; the gun head is fixed on the pipe sleeve, and the pipe sleeve is matched with the outer pipe through threads.
And a back-flushing valve is arranged between the sampling gun and the cyclone separator. Namely, the outlet pipe section of the sampling gun is provided with a back-blowing valve, and the back-blowing valve is used for blowing and blocking coal dust when the gun head of the sampling gun is blocked and cleaning residual coal dust in the gun after sampling is finished.
The gas composition parameters in the gas source are different from the gas in the pulverized coal pipeline, and the gas composition parameters comprise the gas content. The gas source is single-component or multi-component gas with different component parameters from the gas in the pulverized coal pipeline, and the flow of the gas in the gas source is measured by a flowmeter. The gas in the gas source can be single-component gas such as nitrogen, carbon dioxide and the like, or can be multi-component gas such as mixed gas of nitrogen and air, mixed gas of carbon dioxide and air and the like. For example, the gas source and the gas in the pulverized coal pipeline both comprise nitrogen, but the nitrogen content is different.
The formula for calculating the sampling speed of the gas analyzer is as follows:
wherein V is the sampling speed, Q 0 Is the gas flow in the gas source, d is the inner diameter of the gun head of the sampling gun,
the content of the gas X component in the exhaust gas measured by a gas analyzer,
is the component content of X in the gas source,
is the component content of X in the coal powder pipeline.
The gas analyzer is arranged at an outlet pipe section of the cyclone separator, the type of the measurable gas is more than 1, and the component content of the gas X is selected as a measurement object and is used as the gas analyzer.
And a flowmeter and an air source regulating valve are arranged on a pipeline for communicating the air source with the sampling gun. The flowmeter is used for measuring the gas flow, and the opening of the valve can be adjusted according to the relation between the sampling speed and the wind speed in the pulverized coal pipeline, so that the sampling speed is changed to realize constant-speed sampling.
In the invention, the cyclone separator is designed according to a standard cyclone separator, and the volume of the collecting tank is designed according to the sampling amount of the pulverized coal.
The invention mainly solves the problems of complex system and easy blockage of the current coal powder sampling method, integrates a negative pressure injection structure into a sampling gun to realize the compactness and portability of the device, uses diluent gas to prevent blockage, utilizes a gas analyzer to calculate the sampling speed to ensure constant-speed sampling, further reduces the complexity of the system and avoids the blockage problem caused by opening a pressure measuring hole.
The invention has the advantages that: 1. the sampling speed is calculated based on the gas composition parameters measured by the gas analyzer, the precision is high, a pressure measuring hole in the traditional method is not needed, the problem of blockage of the pressure measuring hole is avoided, and system integration is facilitated; 2. the negative pressure injection structure is integrated in the sampling gun, so that the device is compact and portable; 3. the dilution gas can prevent the blockage in the sampling gun; 4. the constant-speed sampling of pulverized coal is realized by adjusting the flow regulating valve of the dilution gas inlet pipe to regulate the sampling speed, pulverized coal at different positions in a pulverized coal pipeline can be measured by replacing gun heads with different size parameters, the dilution magnification can be changed, and blockage can be prevented through a blowback pipeline.
Drawings
FIG. 1 is a schematic structural diagram of a compact coal dust sampling and diluting device provided by the invention;
the device comprises a sampling gun 1, a back flushing valve 2, a cyclone separator 3, a collecting tank 4, a gas analyzer 6, a gas source regulating valve 7, a flowmeter 8, a gas source 9, a pulverized coal pipeline 101, a gun head 102, an inner pipe 103, an outer pipe 104 and a return pipe.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the compact coal dust sampling and diluting device provided in this embodiment includes: sampling gun 1, cyclone 3, collection tank 4, gas analyzer 5 and gas source 8.
The sampling gun 1 comprises a gun head 101, an inner tube 102, an outer tube 103 and a return tube 104, wherein the gun head 101 is communicated with one end of the inner tube 102, the other end of the inner tube 102 is communicated with the cyclone separator 3, the outer tube 103 is communicated with the gas source 8, and the return tube 104 is communicated with an outlet pipe section of the cyclone separator 3. The gun head 101 comprises a bent pipe section, a straight pipe section and a gradually expanding pipe section, wherein the expansion angle of the gradually expanding pipe section is 30-60 degrees; the lance tip 101 is fixed to a shroud which is threadedly engaged with the outer tube 103.
A back-flushing valve 2 is arranged between the sampling gun 1 and the cyclone separator. Namely, the outlet pipe section of the sampling gun is provided with a back-flushing valve 2. The gas analyzer is mounted at the outlet pipe section of the cyclone separator. When the gun head 101 is blocked, the blowback valve 2 is opened to purge the blocked coal powder. After sampling is finished, the back-flushing valve 2 is opened, and residual coal powder in the gun can be cleaned.
And a flowmeter 7 and a gas source regulating valve 6 are arranged on a pipeline for communicating the gas source 8 with the sampling gun 1. The flowmeter measures the gas flow, and the opening of the valve 6 is adjusted according to the relation between the sampling speed and the wind speed in the pulverized coal pipeline, so that the sampling speed is changed to realize constant-speed sampling.
Wherein, cyclone 3 is designed according to standard cyclone, and the volume of collection tank 4 is designed according to the coal dust sample volume.
The gas in the gas source 8 has different parameters from the gas in the pulverized coal pipeline 9, and may be a single component gas such as nitrogen, carbon dioxide, etc., or a multi-component gas such as a mixed gas of nitrogen and air, a mixed gas of carbon dioxide and air, etc.
The working process of the compact coal powder sampling and diluting device provided by the embodiment is as follows:
(1) Opening the gas source regulating valve 6, blocking the gun head 101 of the sampling gun, and measuring the content of gas X under the condition of not sampling by using the gas analyzer 5;
(2) Opening a gun head 101 of a sampling gun, closing a valve of the sampling gun, inserting the sampling gun 1 into a proper position of a pulverized coal pipeline, opening the valve of the sampling gun, allowing gas in a gas source 8 to enter an inner pipe 102 through an outer pipe 103, forming negative pressure through a divergent pipe of the gun head 101 to generate a suction effect to suck pulverized coal flow in the pipeline and dilute the pulverized coal flow, and starting sampling by the gun head 101; when the gas generator is used, gas (diluent gas) firstly enters the outer pipe 103 and then enters the inner pipe 102, and negative pressure is formed through the gradually expanding pipe section of the gun head 101 to generate a suction effect; the gun head 101 is positioned in the pulverized coal pipeline, and the pulverized coal to be measured enters the inner pipe 102 from the gun head 101 under the suction action, is diluted and mixed and then flows out.
(3) The diluted pulverized coal flow is conveyed to a cyclone separator 3, pulverized coal particles and exhaust gas are generated after separation, and the pulverized coal particles are collected by a collecting tank 4; the exhaust gas part is sent back to the pulverized coal pipeline through a sample return pipe 104, and part of the exhaust gas enters a gas analyzer 5;
(4) The gas analyzer 5 measures the content of gas X in the exhaust gas, calculates the sampling speed, adjusts the gas source adjusting valve 6 if the sampling speed is inconsistent with the primary air speed in the coal powder pipeline, so that the speed of the gas source adjusting valve and the primary air speed is consistent, constant-speed sampling is kept, and the coal powder in the coal powder collecting tank 4 is a representative coal powder sample after a period of time.
The gas analyzer 5 calculates the sampling rate by the formula:
wherein V is the sampling speed, Q 0 Is the gas flow of a gas source, d the inner diameter of the gun head of the sampling gun,
the content of the gas X component in the exhaust gas measured by a gas analyzer,
is the component content of X in the gas source gas,
is the component content of X in the coal powder pipeline.
Claims (6)
1. A compact coal dust sampling and diluting device is characterized by comprising a sampling gun, a cyclone separator, a collecting tank, a gas analyzer and a gas source; the sampling gun extends into the pulverized coal pipeline, and gas in the gas source enters the sampling gun to generate a pumping effect to pump and dilute pulverized coal flow in the pipeline; the diluted coal dust flow leaves the sampling gun and enters a cyclone separator, and coal dust particles and exhaust gas are generated through separation; the coal dust particles are collected by a collecting tank, the exhaust gas part is sent back to a coal dust pipeline through a sampling gun, and part of the exhaust gas enters a gas analyzer, and the gas analyzer analyzes gas composition parameters of the exhaust gas so as to calculate the sampling speed of the sampling gun; when the sampling speed obtained by calculation is inconsistent with the wind speed in the pulverized coal pipeline, the sampling speed of the sampling gun is adjusted by adjusting the gas source;
the formula for calculating the sampling speed of the gas analyzer is as follows:
wherein V is the sampling speed, Q 0 Is the gas flow in the gas source, d is the inner diameter of the gun head of the sampling gun,
the content of the gas X component in the exhaust gas measured by a gas analyzer,
is the component content of X in the gas source,
the component content of X in the pulverized coal pipeline;
the gun head comprises a bent pipe section, a straight pipe section and a gradually expanding pipe section, and d is the inner diameter of the bent pipe section.
2. The compact coal dust sampling and diluting device as claimed in claim 1, wherein the sampling gun comprises a gun head, an inner tube, an outer tube and a return tube, the gun head is communicated with one end of the inner tube, the other end of the inner tube is communicated with the cyclone separator, the outer tube is communicated with an air source, and the return tube is communicated with the cyclone separator.
3. The compact pulverized coal sampling dilution device according to claim 2, wherein the divergent angle of the divergent pipe section is between 30 degrees and 60 degrees; the gun head is fixed on the pipe sleeve, and the pipe sleeve is matched with the outer pipe through threads.
4. The compact coal dust sampling and diluting device as claimed in claim 2, wherein a blowback valve is arranged between the sampling gun and the cyclone separator.
5. The compact coal dust sampling and diluting device as claimed in claim 1, wherein the gas composition parameter in the gas source is different from the gas in the coal dust pipeline, and the gas composition parameter comprises gas content.
6. The compact coal dust sampling and diluting device as claimed in claim 1, wherein a flow meter and a gas source regulating valve are arranged on a pipeline of the gas source and the sampling gun.
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| CN202010376661.XA CN111504710B (en) | 2020-05-07 | 2020-05-07 | Compact coal powder sampling and diluting device |
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| CN202010376661.XA CN111504710B (en) | 2020-05-07 | 2020-05-07 | Compact coal powder sampling and diluting device |
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| CN111504710B true CN111504710B (en) | 2023-02-10 |
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| CN112729974B (en) * | 2020-12-22 | 2022-02-18 | 清华大学 | High-temperature high-dust corrosion-resistant anti-blocking sampling device for water-cooled wall of pulverized coal boiler and mounting method |
| CN114383902A (en) * | 2021-11-26 | 2022-04-22 | 国家能源集团新能源技术研究院有限公司 | Tower gas sampling device and tower |
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2020
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