CN211978617U - Device for measuring coal powder concentration of coal-fired power plant pulverizing system - Google Patents
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Abstract
The utility model discloses a measure coal fired power plant powder process system buggy concentration's device belongs to gas-solid two-phase flow measurement field. The utility model discloses the device is including stagnation pipe, dust collecting bin, compressed air jar, differential pressure sensor, temperature and humidity sensor, data acquisition card, computer, wind speed pipe, and the buggy in the wind buggy air current gets into in the stagnation pipe and slows down under the effect of gas drag to make the gaseous static pressure rising in the stagnation pipe, calculate this static pressure rising range through the ration, calculate buggy concentration. The momentum of buggy is directly relevant with its mass concentration and velocity of motion, and is basically irrelevant with the component (coal quality) of buggy, compares to the measuring method who relies on characteristics such as static, electromagnetic wave, electric capacity and index, the utility model discloses simple structure, the result reliability is higher, and interference factor still less does not rely on complicated electronic equipment moreover to the cost is lower.
Description
Technical Field
The utility model belongs to gas-solid two-phase flow measurement field particularly, is a device for measuring coal fired power plant powder process system once wind buggy concentration.
Background
In coal-fired power plants, the pulverizing system grinds coarse coal briquettes/coal particles into fine coal fines, which are transported into a furnace for combustion by means of a gas stream. The parameters of the coal dust (such as fineness and uniformity) have direct and significant influence on the combustion process. For a direct-blowing pulverizing system, a powder feeding pipeline of a single unit can reach more than twenty to thirty paths, and the pulverized coal flow of each powder pipe generally has large deviation, so that an aerodynamic field and a combustion condition in a hearth deviate from the design condition, and a series of problems of incomplete combustion, high NOx generation rate, water wall scouring/coking, overtemperature/pipe explosion of a heat exchange surface, large water reducing consumption and the like are caused. In order to improve combustion efficiency and operational safety and reduce the formation of pollutants, on-line measurement of coal dust concentration (and subsequent equipment and operational control based on such parameters) of a pulverizing system (particularly a direct-fired pulverizing system) is highly necessary.
At present, most coal-fired power plants are not provided with a coal powder concentration measuring device. In a few power plants, a traditional sampling tube measuring system (such as a flute-shaped sampling tube) is installed on a separation outlet pipeline of a coal pulverizing system, and pulverized coal is extracted, collected and weighed through manual operation and converted to obtain the concentration of the pulverized coal. The device is simple and low in cost, but has the problems of poor sampling representativeness, serious abrasion and damage of the sampling tube and the like, and the accuracy, reliability and repeatability of manual operation are difficult to guarantee. The measurement device of the electrostatic method is adopted in a smaller number of power plants, the concentration of the pulverized coal is calculated by sensing and measuring the charge state of pulverized coal particles, but the main defects are that the measurement signals only have relative significance (the signals cannot establish quantitative relation with the absolute concentration of the pulverized coal), the measurement accuracy is greatly influenced by wind and powder parameters such as moisture and coal quality, the coal-fired power plants are difficult to adapt to the actual production conditions of the coal-fired power plants and the variable coal quality, the investment cost is too high, and the coal-fired power plants are difficult to popularize and apply under the condition that the current coal-fired power plants are difficult to operate.
To the actual demand of above-mentioned condition and fully considering the power plant, the utility model provides an rely on buggy momentum to carry out buggy concentration measurement's device.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that current powder process system lacks effectual buggy concentration measurement means, the utility model provides a measure coal fired power plant powder process system buggy concentration's device can convert into this physical mechanism of gaseous phase (air) static pressure ability based on granule looks (buggy) momentum.
The utility model provides a technical scheme that above-mentioned problem adopted is: a device for measuring the concentration of pulverized coal of a coal-fired power plant pulverizing system is characterized by comprising a stagnation pipe, a dust collection bin, a compressed air tank, a first differential pressure sensor, a data acquisition card, a computer, an air speed pipe and a second differential pressure sensor, wherein the stagnation pipe is arranged in a main pipeline, one end of the stagnation pipe is an open end and is arranged towards the incoming flow direction of primary air pulverized coal, the other end of the stagnation pipe is a closed end and is connected to the dust collection bin, and the other end of the stagnation pipe and the main pipeline are respectively provided with static pressure measuring holes and are respectively connected to the first differential pressure sensor through a static pressure leading pipe and a static pressure leading pipe of the stagnation pipe; an air speed pipe is mounted on the main pipeline and is connected with a second differential pressure sensor; a blowback pipe is arranged on the dust collection bin, the blowback pipe is connected with the compressed air tank, and a stop valve is arranged on the blowback pipe; the first differential pressure sensor and the second differential pressure sensor are both connected with a data acquisition card, and the data acquisition card is connected with a computer.
Furthermore, the stagnation pipe can be a straight pipe or an elbow pipe, and the opening of the stagnation pipe can be a straight opening or a bell-mouth structure.
Furthermore, the anemometer is preferably a BS-I type velometer.
Further, still include temperature and humidity sensor, temperature and humidity sensor connects in the trunk line for measure the temperature and the relative humidity of gaseous in the trunk line.
Compared with the prior art, the utility model, have following advantage and effect: the momentum of buggy is directly relevant with its mass concentration and velocity of motion, and is basically irrelevant with the component (coal quality) of buggy, compares to the measuring method who relies on characteristics such as static, electromagnetic wave, electric capacity and index, the utility model discloses simple structure, the result reliability is higher, and interference factor still less does not rely on complicated electronic equipment moreover to the cost is lower.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic view of a measurement principle of an embodiment of the present invention.
Fig. 3 is a schematic structural view (front view, left view) of a measuring head of a straight tube type stagnation tube with a dust collecting bin according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a measuring head of the elbow type stagnation pipe with the dust collecting bin according to the embodiment of the present invention.
Fig. 5 is a schematic view of a stagnation tube structure with a "bell mouth" opening end according to an embodiment of the present invention.
Fig. 6 is a schematic view of a back-to-back design structure of a main pipe static pressure leading pipe and a stagnation pipe of the embodiment of the present invention.
In the figure: the device comprises a main pipeline 1, a stagnation pipe 2, a dust collection bin 3, a compressed air tank 4, a stagnation pipe static pressure leading pipe 5, a main pipeline static pressure leading pipe 6, a first differential pressure sensor 7, a data acquisition card 8, a computer 9, an air speed pipe 10, a second differential pressure sensor 11, a back flushing pipe 12, a stop valve 13 and a temperature and humidity sensor 14.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
The device in the method for measuring the coal dust concentration of the coal powder preparation system of the coal-fired power plant comprises a stagnation pipe 2, a dust collection bin 3, a compressed air tank 4, a first differential pressure sensor 7, a data acquisition card 8, a computer 9, an air speed pipe 10 and a second differential pressure sensor 11, wherein the stagnation pipe 2 is arranged in a main pipeline 1, one end of the stagnation pipe 2 is an open end and is arranged towards the incoming flow direction of primary air coal dust, the other end of the stagnation pipe 2 is a closed end and is connected to the dust collection bin 3, and static pressure measuring holes are formed in the other end of the stagnation pipe 2 and the main pipeline 1 and are respectively connected to the first differential pressure sensor 7 through a stagnation pipe static pressure leading pipe 5 and a main pipeline static pressure leading pipe 6; an air speed pipe 10 is arranged on the main pipeline 1, and the air speed pipe 10 is connected with a second differential pressure sensor 11; a blowback pipe 12 is arranged on the dust collection bin 3, the blowback pipe 12 is connected with the compressed air tank 4, and a stop valve 13 is arranged on the blowback pipe 12; the first differential pressure sensor 7 and the second differential pressure sensor 11 are both connected with a data acquisition card 8, and the data acquisition card 8 is connected with a computer 9.
The utility model discloses a core device is stagnant pipe 2, arranges a wind in and send whitewashed pipeline (for short trunk line 1) in, and its opening orientation comes the flow. When the coal powder moving at a high speed (20-40 m/s) under the drive of the airflow approaches the orifice of the stagnation pipe 2, the coal powder cannot bypass the orifice due to high inertia and is collided into the pipe from the orifice of the stagnation pipe 2. The pulverized coal particles entering the stagnation duct 2 are decelerated by the drag force of the gas (near static state) in the duct, and the gas is simultaneously subjected to the force from the particles to increase the static pressure thereof due to the interaction of the forces. The higher the coal dust concentration, the greater the magnitude of the increase in static pressure. The concentration of the pulverized coal can be calculated by measuring the difference between the tail gas static pressure of the stagnation pipe 2 and the gas static pressure of the main pipeline 1 (main flow), the flow speed and the temperature of the gas in the main pipeline 1 and combining a theoretical principle and an actual calibration formula.
The stagnation pipe can be a straight pipe or an elbow pipe, and the opening of the stagnation pipe can also be a bell mouth structure.
The device is composed of the following core components: a stagnation pipe 2 and a compressed air back-blowing system thereof, an air speed pipe 10, a temperature and humidity sensor 14, a plurality of pressure sensors and differential pressure sensors, a data acquisition card 8 and a computer 9. The main pipeline 1 and the compressed air back flushing system thereof are main innovative contents, and other instruments, equipment, sensors, technical process links and the like can adopt products and technical schemes mature in the market.
The temperature and humidity sensor 14 is connected to the main pipeline 1 for measuring the temperature and relative humidity of the gas in the main pipeline 1, and is subsequently used for calculating gas parameters (density, viscosity, etc.).
The data acquisition card 8 acquires and converts the analog signals from the sensors into digital signals in real time, transmits the digital signals into the computer 9 for data processing and conversion, and obtains the final measurement result, namely the coal dust concentration, and the computer 9 adopts the existing mature technology for data processing technology.
The wind speed pipe 10 preferably adopts a BS-I type speed measuring device (refer to the industry standard of performance test of a power station coal mill and a powder making system: DL/T467-2004), and has the advantages of directly obtaining the air speed (the measurement signal is irrelevant to the concentration of the pulverized coal), simple structure and low manufacturing cost.
The technical principle of the utility model is introduced as follows:
static pressure p in stagnation tube 2 under pure gas flowsEverywhere equal and equal to the total pressure of the incoming flow (main flow), namely:
wherein: p is a radical ofs,0Is static pressure (unit: Pa), p in the stagnation pipe 2 under the condition of pure airflow and no pulverized coalgStatic gas pressure (unit: Pa) which is the main flow; rhogThe gas density (unit: kg/m) of the main stream3) At a static pressure pgAnd the temperature and the relative humidity of the mainstream gas measured by the temperature and humidity sensor 14 are calculated based on an ideal gas state equation as known quantities; u. of0The gas flow rate (unit: m/s, measured by the anemometer 10 in FIG. 1) of the main stream)。
When the airflow contains coal powder, the coal powder is larger in particle size and higher in movement speed, and only a small amount of coal powder particles moving towards the orifice of the stagnation pipe 2 move continuously downstream along with the air bypassing the stagnation pipe 2 when passing through the front end of the stagnation pipe 2, most of the coal powder particles enter the stagnation pipe 2 from the open end of the stagnation pipe 2 and gradually decelerate under the action of airflow drag force, and the coal powder particles also exert reaction force on the air in the pipe, so that the static pressure in the pipe is increased, and the static pressure is higher when the pipe is closer to a closed section (pipe bottom).
So that:
wherein: p is a radical ofs(c) The static pressure (unit: Pa) in the stagnation pipe 2 under the condition of coal dust exists, c is the mass concentration of coal dust particles, k is called a pressure head conversion factor, represents the proportion of the momentum of the coal dust converted into the static pressure rise amplitude of gas in the stagnation pipe 2, and is related to factors such as the structural design, the material, the particle size of the coal dust and the like of the stagnation pipe 2.
Substituting equation (1) into equation (2) has:
so that:
△psis the differential pressure measured by differential pressure sensor No. one 7 shown in fig. 1. It can be seen that the mass concentration c of the coal dust can be calculated by combining other parameters (obtained by measurement) as long as the head pressure conversion factor k is determined.
In individual ideal cases, theoretical values for k can be derived, including: 1) when the stagnation pipe 2 is a straight pipe, the inertia of the pulverized coal is very small, and the pulverized coal can completely follow the movement of the fluid, k is 1; 2) when the stagnation pipe 2 is a straight pipe, the inertia of the pulverized coal is large and the stagnation pipe 2 is long enough, k is 2. In practical cases, the value of k is not known in advance, but must be calibrated to derive it.
The calibration method of k is as follows: in the production site of a powder process system or in a laboratory simulation environment, c is obtained by standard means such as constant-speed Sampling weighing method (for example, international standard ISO 9931, "code-Sampling of sampled code by gases in direct fixed code systems") and k can be calculated by formula (4). Under the conditions of actual operation condition and small difference between the fineness of the pulverized coal and the calibration state, the k value obtained by calibration can be used for real-time online measurement of c. k is not the core of the utility model, which is convenient to be implemented in principle and technology, so the detailed process is not repeated here.
Table 1 shows the calculated head conversion factor (particle density 2250 kg/m) based on Computational Fluid Dynamics (CFD) values at different coal fines particle sizes3The gas is room temperature air, the main flow velocity is 15m/s, and the diameter of the stagnation pipe 2 is 10mm and the length is 200 mm). Table 1 shows that in a wider particle size range (40-100 mu m), the change amplitude of k along with the particle size of the particles is smaller, which means that the method is insensitive to the change of the particle size distribution range (generally unknown) of the pulverized coal in the actual production process, and the method is one of the key advantages of the method.
TABLE 1 CFD validation example results of stagnation tube measurement principle
The continuous accumulation of coal dust in the stagnation duct 2 causes it to be "plugged" with coal dust, and dust removal measures must be taken. Fig. 3 shows a measuring head with a dust bin 3. The measuring head works in a horizontal main pipeline 1, and the coal powder entering the stagnation pipe 2 falls into the dust collection bin 3 under the action of gravity, so that the blockage of the stagnation pipe 2 is avoided within a period of time.
FIG. 1 illustrates a method for removing accumulated dust by using compressed air for back blowing. When the stop valve 13 is closed, compressed air is not blown back, and the measuring device is in a normal working state. When the stop valve 13 is opened, the compressed air from the compressed air tank 4 enters the dust collecting bin 3 at a high flow rate, and the accumulated dust in the dust collecting bin is blown up and taken out and blown into the main pipeline 1 through the nozzle of the stagnation pipe 2. The measuring head can maintain a continuous (short intermittent) measuring state through periodic back blowing.
The design shown in fig. 3 is preferably used for the horizontal section of the main conduit 1. In the vertical section of the main pipeline 1, the wind-powder airflow moves from bottom to top, and in order to avoid powder accumulation, a structure that the inlet of the stagnation pipe 2 is a section of bent pipe (figure 4) can be adopted. After the pulverized coal enters the elbow, part of the pulverized coal can enter the straight pipe section, and the other part of the pulverized coal collides with the inner wall surface of the elbow, which is close to the outer side of the turning radius, changes the movement direction and further can enter the straight pipe section. Since the probability of collision of particles with the tube wall is higher than that of the straight tube type stagnation tube 2 (fig. 3), a part of the momentum thereof is lost in the wall collision, the head pressure conversion factor k in this case is smaller than that of the straight tube type stagnation tube 2.
According to equation (3), a larger k is advantageous for the measurement, and a larger k is equally the casesThe larger the measurement, the higher the Δ psThe smaller the relative error of the measurement. To increase k, the entrance of the stagnation tube 2 may be designed in a "bell mouth" shape, as shown in fig. 5. Flare opening diameter D2Greater than the diameter D of the straight pipe1The function is to make more (compared with the straight pipe type stagnation pipe 2) pulverized coal particles enter the stagnation pipe 2, thereby obtaining larger delta psAnd k. A flared inlet may also be used for the stagnation pipe 2 (fig. 4) with the inlet being an elbow.
The measurement of the main static pressure may adopt a mode of tapping and taking pressure on the main pipe 1 as shown in fig. 1, or may adopt a more compact 'back-to-back' design, i.e. a main pipe static pressure leading pipe 6 for measuring the main static pressure is integrated with the stagnation pipe 2, the stagnation pipe 2 faces the incoming flow, and the main static pressure leading pipe faces away from the incoming flow (fig. 6). This form is similar to the familiar S-pitot tube (commonly known as a back tube) for speed measurement.
The implementation process comprises the following steps: in the horizontal section of the primary air powder conveying pipeline, the method adoptsThe straight pipe is used as a stagnation pipe 2, the stagnation pipe 2 is connected with a dust collection bin 3,the backrest pipe shown in figure 6 is matched (the main pipe 1 is not additionally provided with a static pressure measuring hole). The wind speed of the main pipeline 1 is measured by a BS-I type speed measuring tube. The temperature and humidity of the gas are measured in the main conduit 1 by temperature and humidity sensors 14. In the production field of a coal-fired power plant adopting a direct-fired pulverizing system, a key undetermined parameter k of the method is obtained by calibrating a method specified by international standard ISO 9931. The data acquisition card 8 passes to the computer 9 with the signal that each sensor surveyed, utilizes calculation method and formula carry out the analysis and calculation to aforementioned signal, obtain buggy concentration.
Those not described in detail in this specification are well within the skill of the art.
In addition, it should be noted that the above contents described in the present specification are only illustrations of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions by those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. A device for measuring the concentration of pulverized coal of a coal pulverizing system of a coal-fired power plant is characterized by comprising a stagnation pipe (2), a dust collection bin (3), a compressed air tank (4), a first differential pressure sensor (7), a data acquisition card (8), a computer (9), an air speed pipe (10) and a second differential pressure sensor (11), wherein the stagnation pipe (2) is arranged in a main pipeline (1), one end of the stagnation pipe (2) is an open end and is arranged towards the incoming flow direction of primary air pulverized coal, the other end of the stagnation pipe (2) is a closed end and is connected to the dust collection bin (3), and static pressure measuring holes are formed in the other end of the stagnation pipe (2) and the main pipeline (1) and are connected to the first differential pressure sensor (7) through a stagnation pipe static pressure leading pipe (5) and a static pressure leading pipe (6) respectively; an air speed pipe (10) is mounted on the main pipeline (1), and the air speed pipe (10) is connected with a second differential pressure sensor (11); a blowback pipe (12) is arranged on the dust collection bin (3), the blowback pipe (12) is connected with the compressed air tank (4), and a stop valve (13) is arranged on the blowback pipe (12); the first differential pressure sensor (7) and the second differential pressure sensor (11) are both connected with a data acquisition card (8), and the data acquisition card (8) is connected with a computer (9).
2. The device for measuring the pulverized coal concentration of the coal pulverizing system of the coal-fired power plant according to claim 1, wherein the stagnation pipe (2) is a straight pipe or a bent pipe.
3. The device for measuring the pulverized coal concentration of the coal pulverizing system of the coal-fired power plant as claimed in claim 2, wherein the opening of the stagnation pipe (2) is in a straight mouth or a bell mouth structure.
4. The device for measuring the pulverized coal concentration of the coal-fired power plant pulverizing system of claim 1, wherein the wind speed pipe (10) adopts a BS-I type velocity measuring pipe.
5. The device for measuring the pulverized coal concentration of the coal pulverizing system of the coal-fired power plant according to claim 1, further comprising a temperature and humidity sensor (14), wherein the temperature and humidity sensor (14) is connected in the main pipeline (1) and is used for measuring the temperature and the relative humidity of the gas in the main pipeline (1).
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