CN2570778Y - Coal power metering apparatus - Google Patents

Abstract

The utility model relates to a measuring instrument for substances in a pipeline, in particular to an instrument for measuring the state of pulverized coal in a coal transportation pipeline by using a nuclear radiation source. The pulverized coal meter is composed of a data acquisition device, a data storage device, and a central data processing device. -Consisting of a low-energy photon source in the shielding body, the radiation receiver is a radiation detector set in the shielding sleeve, the data storage device is connected to the radiation detector, and the central data processing device is connected to the data storage device. The pulverized coal meter uses nuclear radiation sources to detect the density of pulverized coal in the coal pipeline of coal-fired thermal power plants online, measures the cumulative coal consumption, and displays the operating status of the coal pipeline system at the same time. The equipment is small in size, light in weight, simple and safe to operate, The measurements are accurate.

Description

Pulverized coal meter

                      

The utility model relates to a measuring instrument for substances in a pipeline, in particular to an instrument for measuring the state of pulverized coal in a coal transportation pipeline by using a nuclear radiation source.

Background technique

At present, the coal-fired measuring instruments commonly used in coal-fired thermal power plants are mainly belt scales. Due to differences in usage methods and measurement techniques, the accuracy of the calculated coal consumption for power generation is also different, which is mainly reflected in two aspects. One is to use the common coal loading and metering system to measure the total coal consumption of the whole plant, but the individual coal consumption of each furnace is not counted, and the coal consumption per kilowatt-hour of electricity obtained is the average value of the whole plant. The other is the furnace-by-furnace calculation system composed of computer technology and electronic belt scales to obtain the coal consumption of each furnace, which can more accurately reflect the combustion performance of a single furnace and the technical level of the fireman, but it cannot On-line detection of the running status of the coal pipeline system and instantaneous measurement of coal consumption. Therefore, in order to continuously improve the benefits of coal-fired power plants and further strengthen the scientific management of coal consumption in power generation, it is necessary to develop more sophisticated new coal-fired measuring instruments and equipment.

Contents of the invention

The purpose of the utility model is to overcome the deficiency of the existing pulverized coal measuring instrument, and provide a pulverized coal measuring instrument which can detect the running status of each coal delivery pipeline system in a thermal power plant and calculate the coal consumption on line.

The technical scheme of the utility model is as follows: the pulverized coal meter is composed of a data acquisition device, a data storage device, and a central data processing device. The emitter is composed of a low-energy photon source set in the collimation-shielding body, the radiation receiver is a radiation detector set in the shielding body, the data storage device is connected with the radiation detector, and the central data processing device is connected with the data storage device.

The pulverized coal meter uses nuclear radiation sources to detect the density of pulverized coal in the coal pipeline of coal-fired thermal power plants online, measures the cumulative coal consumption, and displays the operating status of the coal pipeline system at the same time. The equipment is small in size, light in weight, simple and safe to operate, The measurements are accurate.

Description of drawings

Figure 1 is a schematic diagram of the structure of a pulverized coal meter.

In the figure 1. Collimation-shielding body 2. Low-energy photon source 3, 4. Coal pipeline wall 5. Radiation detector 6. Shielding body 7. Signal cable 8. Data storage device 9. Signal cable 10. Central data processing device

Detailed ways

As shown in Figure 1, the pulverized coal measuring instrument includes mutually corresponding ray transmitters and ray receivers arranged on the outer walls 3 and 4 of the coal pipeline, and the ray transmitter consists of a low-energy photon source located in the collimation-shielding body 1 2, the radiation receiver is the radiation detector 5 arranged in the shielding body 6. The low-energy photon source 2 shoots the radiation through the coal pipeline to the radiation detector 5 through the collimator, and the radiation detector 5 can be a G-M counter tube or a scintillation detector. The radiation detector 5 is connected to a data storage device 8 through a signal cable 7, and the data storage device 8 is composed of an interconnected pulse signal discriminator, a pulse count memory, a microprocessor and a light display circuit, and the data storage device 8 is connected to a central data storage device through a signal cable 9. The processing device 10, the central data processing device 10 is composed of an operational amplifier connected to each other, a microcomputer and a photoacoustic alarm display.

When a beam of low-energy photons, such as x-rays or γ-rays, is irradiated on an object, after passing through the material at different depths d, the ratio of the number of transmitted rays N to the incident number N ₀ is the same as the density ρ of the material related, namely $N=N_0{e}^{-{\mathrm{\μ}}_m\mathrm{\ρd}}$ , where μ _m is the mass attenuation coefficient of the substance corresponding to the photon. Just can calculate the density ρ of this kind of substance by this formula, Here it is the measuring principle of the utility model pulverized coal measuring instrument. Then, from the measured value or estimated value of the coal gas flow in the coal pipeline, the time change of coal consumption and the difference between the operating teams can be obtained, and the accumulated coal consumption and other enterprise quality management needs can be obtained from the measured value of the gas flow. Various signal sources for data and online control.

The energy range of the low-energy photon source 2 used in the pulverized coal measuring instrument of the utility model is below 300 keV, and generally a low-energy gamma source or an x-ray source can be used. The collimation-shielding body 1 can be made of tungsten or lead. The linear width of the collimating holes is 2mm-16mm, the length is 2mm-200mm, and the depth is 3mm-15mm. The wall thickness of the shielding body is greater than 4mm. The radiation detector 5 can generally adopt a G-M counter tube or a scintillation detector, and the pulse signal is transmitted to the pulse signal discriminator of the data storage device 8 through the signal cable 7. The microprocessor sends the signal to the operational amplifier of the central data processing device 10 through the signal cable 9, and the microcomputer connected with the operational amplifier performs data processing. The central data processing device 10 is connected with a photoacoustic alarm display to perform digital display, photoacoustic alarm, etc. in real time, so as to realize the quality management of the coal-fired thermal power plant.

Claims (3)

1. coal powder metering instrument, constitute by data collector, data storage device, central data processing unit, it is characterized in that: data collector comprises that being located at convey coal pipe outer wall (3,4) goes up corresponding mutually ray emitter and ray receiver, ray emitter is made of the low-energy photon source (2) that is located in collimation-shield (1), ray receiver is for being located at the radiation detector (5) in the shield (6), data storage device (8) links to each other with radiation detector (7), and central data processing unit (10) connects data storage device (8).

2. coal powder metering instrument as claimed in claim 1 is characterized in that: data storage device is screened instrument, step-by-step counting storer, microprocessor and light display circuit by interconnective pulse signal and is formed.

3. coal powder metering instrument as claimed in claim 1 or 2 is characterized in that: central data processing unit is made up of interconnective operational amplifier, micro computer and optoacoustic attention display.

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