KR101623201B1 - Coal supply pipeline flow measurement method for call flow equal distribution of thermal power plants - Google Patents
Coal supply pipeline flow measurement method for call flow equal distribution of thermal power plants Download PDFInfo
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- KR101623201B1 KR101623201B1 KR1020150161569A KR20150161569A KR101623201B1 KR 101623201 B1 KR101623201 B1 KR 101623201B1 KR 1020150161569 A KR1020150161569 A KR 1020150161569A KR 20150161569 A KR20150161569 A KR 20150161569A KR 101623201 B1 KR101623201 B1 KR 101623201B1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
- G01F9/001—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine with electric, electro-mechanic or electronic means
- G01F9/003—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine with electric, electro-mechanic or electronic means by measuring the weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1003—Processes to make pulverulent fuels
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- F23K2401/201—
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Abstract
Description
The present invention relates to a method of measuring the flow rate of a pulverized coal supply pipe for uniform distribution of a coal flow rate in a thermal power plant, and more particularly, to a method of measuring a pulverized coal supply flow rate uniformly distributed in a thermal power plant, The amount of pulverized coal in the pulverized coal supply line is measured so that the amount of coal supplied to the combustion chamber can be measured and the efficiency of the production of pulverized coal and data The present invention relates to a method for measuring a flow rate of a pulverized coal supply pipe for uniformly distributing a call flow rate of a thermal power plant.
For the thermal power generation, the coal is crushed and transported to the boiler, mixed with the air and transferred to the combustion chamber. The heat generated by the combustion in the combustion chamber generates steam and electricity can be generated by the rotation of the turbine due to the pressure of the steam. In the thermal power generation process, the amount of coal supplied to the fuel can be controlled in a coal feeder. The coal that has passed through the charcoal is pulverized by the pulverizer and can be transferred to the burner of the combustion chamber through each of the coal feed pipes by the primary air corresponding to the pulverized coal transfer air. It is advantageous that the amount of coal supplied through each of the straight supply pipes is adjusted to be constant in order to improve the combustion efficiency in the combustion chamber. To this end, a calorie flow rate measuring device capable of measuring the flow rate of the variable orifice valve and the pulverized coal is installed in each discharge pipe (pipe) of the outlet of the differentiator.
Prior art relating to the measurement and control of the call flow rate is disclosed in Patent Publication No. 1985-0004801 " Relative distribution method of pulverized coal and its apparatus ". This prior art has been used to obtain a value proportional to a quadratic integral of a plurality of electrical charge detectors and a charge flux at a similar location in a tube connected to a mill connected to the pulverizer to generate an induction signal through the passage of the pulverized pulverized coal, A circuit device connected to an induction device for the transmission of each induction signal, and a comparator for comparing the value of the electric charge flux with respect to an induction signal at a relative flow rate in each pipe, To the pulverized coal distribution device for measuring the relative flow rate of the pulverized coal.
Another prior art related to the distribution of pulverized coal is disclosed in Korean Patent Publication No. 2005-0076347, " Optimization of pulverized coal distribution system for power plant boiler optimum combustion. &Quot; The prior art discloses a method for measuring the flow rate of pulverized coal using a flow velocity measured by a sensor installed at a position different from the density of pulverized coal measured by a microwave.
The pulverized coal flow measurement method disclosed in the prior art has a problem that when applied to coal of the same kind, the error is not large, but when applied to other types of coal, the deviation or error may become large. Therefore, a coal flow measurement method capable of using coal produced from a variety of mountains for thermal power generation and ensuring measurement reliability regardless of the type of coal is required.
The measurement of the flow rate by the method of measuring the flow rate by the method of measuring the flow rate of the generated pressure due to the pressure drop caused by the distance of the pipe or the pipe element through the flow of the fluid flowing through the pipe (pipe) . That is, in the conventional method of calculating the flow rate by measuring the pressure drop amount, if the density of the fluid is not constant, the flow rate is different even if the pressure drop amount is the same. In order to use the method of approaching the flow rate from the pressure drop amount, A calculation is required.
Particularly, in the case of a mixed fluid of pulverized coal and air supplied to a combustion chamber of a thermal power plant, it is not easy to determine the density considering that it is a polyphase fluid mixed with pulverized coal of 200 mesh or less. The core of the present invention is to obtain the density values necessary for approaching the flow rate by extracting the pressure formed inside the apparatus for grinding coal into pulverized coal and mixing with air and calculating the density of the pulverized coal and air mixed fluid therefrom A method is required.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to improve the uncertainty of flow measurement for a mixed fluid of air and pulverized coal in a pulverized coal supply line of a thermal power plant, It is possible to accurately recognize the mixed flow rate with the pulverized coal supplied to the combustion chamber, thereby ensuring the soundness of the system operation by the pulverized coal supply pipe of the thermal power plant. Thus, the flow of the coal supplied to the combustion chamber is uniformly distributed It is possible to stabilize the flame in the combustion chamber, to prevent the local overheating of the combustion chamber due to flame uniformity, to increase the combustion efficiency, and to increase the combustion efficiency relative to the input fuel amount, Provides a method for measuring the flow rate of pulverized coal for uniform distribution The goal is to have.
The present invention also provides a pulverized coal supply pipe flow measurement method for uniformly distributing the call flow rate of a thermal power plant in which generation of harmful combustion gases such as oxides of nitrogen and the like is remarkably reduced due to optimum combustion, .
In order to accomplish the above object, the present invention provides a method for measuring the flow rate of pulverized coal in a pulverized coal power plant, comprising the steps of: discharging coal to measure weight through a load cell, supplying coal measured by the load cell to a pulverizer, The supplied coal is rotary pulverized, air at 260 to 290 ° C is blown to the pulverized coal side with coal pulverized in the pulverizer, finely pulverized coal having a size of 200 mesh or less (hereinafter referred to as pulverized coal) is mixed with air, A method for measuring the flow rate of pulverized coal supplied to a combustion chamber through a call pipe (hereinafter referred to as a supply pipe path), comprising the steps of: a) measuring the static pressure of the outlet of the differentiator at which the differentiator and the supply pipe are in contact with each other and the inlet static pressure of the combustion chamber, Measuring a differential pressure of the combustion chamber inlet static pressure on the basis of the outlet static pressure; b) Calculation of the amount of coal supplied and the differential pressure measured through the flow rate of pure air, calculating the loss factor for each supply line, comparing the loss factor derived from the flow analysis, From the difference between the loss factor and the loss factor calculated from the loss factor and the flow analysis, the density contribution of the mixed air and the interlocking function extraction with the master and the master reference density equation are extracted from the mass flow rate of the air and the density and the valve opening A basic data obtaining step of extracting a loss coefficient equation to each of the supply pipes based on the equation; and c) calculating a flow rate to the supply pipe by using the differential pressure measurement value measured in step a) and b) the basic data acquired in the basic data acquisition step.
When the supply lines are formed to have different lengths, an orifice valve is provided on the supply line to adjust the differential pressure for adjusting the differential pressure generated for each supply line. Herein, the total loss coefficient of the supply pipe provided with the orifice valve is calculated by summing the loss coefficient of the supply pipe and the loss coefficient of the orifice valve, and the loss coefficient equation of the loss coefficient K v of the orifice valve is Kv = -4.07499E -7x characterized in that the 4 + 1.06987E-4x 3 -8.64872E- 3x 2 + 0.135274x + 6.83321.
The method of measuring the pulverized coal supply channel flow rate for the uniform distribution of the coal flow rate of the thermal power plant according to the present invention improves the uncertainty of the flow measurement for the mixed fluid of the air and the pulverized coal in the pulverized coal supply channel of the thermal power plant, It is possible to accurately recognize the mixed flow rate with the pulverized coal supplied to the combustion chamber by mixing with the pure air supplied at the correct flow rate, thereby ensuring the soundness of the system operation by the pulverized coal supply pipe of the thermal power plant, It is possible to stabilize the flame in the combustion chamber, to prevent local overheating of the combustion chamber due to flame uniformity, to increase the combustion efficiency, and to increase the combustion efficiency relative to the input fuel amount, thereby increasing the efficiency by minimizing the fuel consumption .
In addition, the present invention has the advantage that the generation of harmful combustion gases such as oxides of nitrogen by optimum combustion is significantly reduced, and the occurrence of environmental pollution sources can be minimized.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms.
In the present specification, the present embodiment is provided to complete the disclosure of the present invention and to fully disclose the scope of the invention to a person having ordinary skill in the art to which the present invention belongs. And the present invention is only defined by the scope of the claims. Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.
Like reference numerals refer to like elements throughout the specification. And, the terms used (hereafter) used herein are intended to illustrate the embodiments and are not intended to limit the invention in any way. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.
Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.
Hereinafter, technical features according to an embodiment of a pulverized coal supply pipe flow measurement method of a thermal power plant according to the present invention will be described in detail with reference to the accompanying drawings.
The method for measuring the flow rate of a pulverized coal feed pipe of a thermal power plant according to the present invention is characterized in that the coal is discharged and the weight is measured through the load cell and then the coal measured by the load cell is supplied to the pulverizer, , Air of 260 to 290 ° C is blown into the pulverized coal side by the pulverized coal in the pulverizer, finely pulverized coal of not more than 200 mesh (hereinafter referred to as pulverized coal) is mixed with the air and a plurality of call pipes ), It is possible to ensure the soundness of the combustion air driving system by measuring the flow rate of the pulverized coal supplied to the combustion chamber, and there is an advantage that it can be utilized even when the type of coal is changed to predict the combustion efficiency. It can be utilized for estimation and prediction of power generation efficiency according to the accurate calculation of the amount of carbon, and even if supplying various types of coal, You can eliminate the burden that may be.
The method for measuring the flow rate of the pulverized coal feed pipe of the thermal power plant according to the present invention comprises the steps of: a) measuring the static pressure of the outlet of the differentiator at which the pulverizer and the feed pipe are in contact with each other and the inlet static pressure at the combustion chamber contacting with the feed pipe, The differential pressure of the inlet static pressure of the combustion chamber is measured.
As described above, when the coal is introduced into the differentiator, the coal is finely divided and is supplied to the combustion chamber through the supply line to the combustion chamber. Lt; / RTI > At this time, when only the pure air is normally moved, since the diameter of the supply pipe and the density of the pure air are known, the measurement of the flow rate and the flow rate is constant and the outlet static pressure of the differentiator in contact with the supply pipe is always constant. However, when the coal is mixed with the pulverized coal and the air is mixed with the pulverized coal, the outlet static pressure of the differentiator which is in contact with the supply pipe is changed, and the static pressure is usually adjusted to be high. At this time, since the magnitude of the static pressure to be adjusted is proportional to the amount of the supplied coal, it is possible to calculate the supplied carbon amount by comparing the magnitude of the generated positive pressure with the static pressure of pure air. Therefore, it is possible to calculate the density of the fluid in which air and pulverized coal are mixed based on this output, and the calculated density can be applied to the pressure drop amount formed in the pipe to calculate the flow rate.
Therefore, in order to calculate such a flow rate, more reliability can be secured through the formula based on the basic data obtained in the step b).
Meanwhile, in step a), the differential pressure measures four differential pressures to the supply pipe, and data is secured through two methods. First, the data is acquired while the differential pressure is kept constant. Second, the data is acquired while the constant pressure of the combustion chamber inlet is kept constant.
In both of the above methods, the differential pressure is measured by measuring the static pressure of the outlet of the differentiator and the static pressure of the inlet of the combustion chamber by setting the four pipe lines to 1, 2, 3 and 4 for the carbon and PA flow (air).
Here, the data through the former method analyzes the data on the assumption that the flow rate of each pipe is evenly distributed. However, due to the uncertainty of the static pressure at the outlet of the differentiator, it can not be compensated by the differential pressure, and the scattering of the flow rate to each supply pipe calculated from the differential pressure is calculated to some extent from the reliability of the measured value.
On the other hand, the data obtained by the latter method, which is obtained under a certain condition of the inlet pressure of the combustion chamber, is the same as that assuming that the flow rate to each supply pipe is evenly distributed, but the correction of the differential pressure is possible based on the static pressure at the exit of the differentiator, The calculated flow rate distribution to each of the supply pipes is small and the reliability of the data based on the flow rate analysis of the supply pipe is high.
Based on the data obtained under the constant condition of the inlet pressure of the combustion chamber, it is calculated by correcting the differential pressure measured through the amount of coal supplied in step b) and the flow rate of pure air, calculating the loss coefficient to each supply pipe, The density of mixed air is calculated from the amount of coal supplied and the mass flow rate of pure air, and the difference between the loss factor and the loss factor calculated from the flow analysis is compared with the loss factor derived from the analysis. , The master reference density equation and the basic data acquisition step to extract the loss factor equations for each supply pipe based on the density and the valve opening,
c) It is possible to measure the pulverized coal flow rate of the supply pipe through the flow rate calculating step of calculating the flow rate to the supply pipe by the formula through the measured value and the obtained basic data.
First, in the basic data acquisition step, the master pipe (set as the pressure meter to the supply pipe) is used as the second to fourth supply pipes for supplying the pulverized coal from the differentiator to the combustion chamber.
<Examples>
1. Adjust the opening of the valve within the range of 50 ~ 100% so that the static pressure at the inlet of the combustion chamber to all the supply lines is constant. Measure the static pressure of the differentiator outlet and the static pressure at the inlet of the combustion chamber. Table 1 shows measured values under constant differential pressure conditions, and Table 2 shows measured values under constant constant inlet pressure at the combustion chamber.
According to the above measurement result, as described above, the correction of the pressure difference is performed based on the constant condition of the inlet pressure of the combustion chamber shown in [Table 2].
2. Calibrate the differential pressure measured in the supply line as follows, and calculate using the corrected differential pressure in the following calculation procedure.
The corrected differential pressure is calculated as shown in the following Table 3 based on the measured constant value of the inlet static pressure of the combustion chamber through the above equation.
3. Calculate the pressure coefficient of the master as the second feed line.
C P : the pressure coefficient of the master
4. Calculate the density of the mixed air through the pressure gauge of the master.
Through the above calculation equation, it is possible to calculate the density of mixed air from the amount of carbon and PA air as in [Table 4].
A graph of the behavior of the master reference mixed air density according to the above graph
Based on the above chart, it can be seen that the density of the mixed air becomes lower when the master (the No. 2 supply line) pressure gauge increases. This indicates that the density of the mixed fluid containing pulverized coal decreases with increasing pressure due to the pressure rise. That is, it becomes a standard of the density according to the opening degree of the master.
5. Calculate the loss factor for each pipe (pipe).
From the difference between the loss coefficient calculated in the experiment and the loss coefficient calculated from the experiment, the density contribution of the mixed air is analyzed and the interlocking function with the master pipe (2) is extracted. , And Table 6 is a comparison chart of the loss factor derived from the flow analysis.
Since the master (pipeline No. 2; Pipe No. 2) has no opening change, it is set as a loss coefficient function for the density of the mixed air, and as shown in Tables 5 and 6, the loss coefficient of the master is confirmed through the following graph do.
In the graph, there is little change in the loss coefficient with respect to the change in the density of the second feed pipe (pipe).
As shown in the graph below through the loss coefficient function of the master (the feed pipe No. 2 and No. 2 pipe), the feed pipe lines 1, 3 and 4 change the opening degree, and the loss coefficient changes accordingly.
That is, as shown in the chart, the loss coefficient of 1, 2, and 4 pipe lines can be confirmed.
6. Calculate the flow rate.
The flow rate is calculated on the basis of the data of the above-described charts through the above equation.
7. Calculate the flow rate.
It is possible to obtain a reliable measurement value of the flow rate of the pulverized coal as the mixed fluid according to the measured values of the outlet static pressure of the pulverizer and the inlet static pressure of the pulverizer through the process according to the embodiment.
When the supply lines are formed to have different lengths, an orifice valve is provided on the supply line to adjust the differential pressure for adjusting the differential pressure generated for each supply line. Here, the total loss coefficient of the supply pipe provided with the orifice valve is characterized by summing the loss coefficient of the supply pipe and the loss coefficient of the orifice valve. Here, the loss coefficient K of the orifice valve V is Kv = -4.07499E-7x 4 + 1.06987E -4x 3 -8.64872E-3x 2 + via the loss coefficient of the equation 0.135274x + 6.83321 of pulverized coal to a more accurate resolution is possible It is possible to measure the flow rate to the supply pipe, and it is possible to respond to various types of coal instantly, thus enabling quick work.
By ensuring the reliability of the flow rate measurement as described above, it is possible to uniformly distribute the call flow supplied to the combustion chamber, thereby stabilizing the flame in the combustion chamber from the viewpoint of increasing the power generation efficiency for generating electricity, In addition, it is possible to increase the efficiency by minimizing fuel consumption, and it is possible to reduce the generation of harmful combustion gases such as oxides and the like due to optimal combustion in the environmental aspect, It is self-evident that it can be minimized.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Various changes and modifications may be made by those skilled in the art, The present invention is not limited thereto.
Claims (4)
a) measuring the differential pressure of the differentiator at which the differentiator and the supply pipe are in contact with each other, measuring the inlet static pressure of the combustion chamber in contact with the supply duct and the combustion chamber, and measuring the differential pressure of the inlet static pressure of the combustion chamber based on the outlet static pressure;
b) Calculation of the amount of coal supplied and the differential pressure measured through the flow rate of pure air, calculating the loss factor for each supply line, comparing the loss factor derived from the flow analysis, From the difference between the loss factor and the loss factor calculated from the loss factor and the flow analysis, the density contribution of the mixed air and the interlocking function extraction with the master and the master reference density equation are extracted from the mass flow rate of the air and the density and the valve opening A basic data obtaining step of extracting a loss coefficient equation to each of the supply pipes based on the equation;
and c) calculating a flow rate to the supply pipe by a formula through the differential pressure measurement value measured in step a) and b) the basic data acquired in the basic data acquisition step. Method for measuring flow rate of supply duct.
The differential pressure measured in the step a), which measures the differential pressure of the inlet static pressure of the combustion chamber on the basis of the static pressure at the outlet of the differentiator, is corrected as shown in the following equation,
(P 1 = 1 static pressure to the supply line, P 2 = 2 static pressure to the supply line, P 3 = 3 static pressure to the supply line, P 4 = 4 static pressure to the supply line, P 11 = differentiator outlet static pressure to the supply line 1, P 21 = P 31 = differential pressure at the outlet of the differentiator of the supply line 3, P 41 = differential pressure at the outlet of the differentiator of the supply line 4) In the following calculation process, the correction differential pressure is used,
The calculation of the density of the mixed air through the master's pressure coefficient is calculated by the following equation,
The loss factor is calculated by the following equation,
(K 1 = loss coefficient of the feed line 1, K 2 = loss coefficient of the feed line 2, K 3 = loss coefficient of the feed line 3, K 4 = loss coefficient of the feed line 4)
The flow rate is calculated by the following equation,
(i = feed pipe number)
Calculating the flow through the formula
A method for measuring flow rate of a pulverized coal supply pipe of a thermal power plant.
Wherein an orifice valve is provided for adjusting a pressure difference between the supply pipe and the discharge pipe, wherein a total loss coefficient of the supply pipe is a sum of a loss coefficient of the supply pipe and a loss coefficient of the orifice valve, Method for measuring flow rate of supply duct.
The loss coefficient equation of the loss coefficient K V of the orifice valve
Kv = -4.07499E-7x 4 + 1.06987E -4x 3 -8.64872E-3x 2 + 0.135274x + 6.83321 a pulverized coal supply pipe flow rate measurement method of the thermal power plant, characterized in that.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114707246A (en) * | 2022-04-08 | 2022-07-05 | 中国航发沈阳发动机研究所 | Correction method for flow distribution test data of main combustion chamber of aircraft engine |
| CN114838863A (en) * | 2022-03-15 | 2022-08-02 | 华能伊敏煤电有限责任公司 | Heat dissipation ventilation volume monitoring and alarming device for 220T dumper electric control cabinet |
| CN117472116A (en) * | 2023-12-26 | 2024-01-30 | 徐州鸿丰高分子材料有限公司 | Intelligent material conveying control system |
| CN118328415A (en) * | 2024-05-13 | 2024-07-12 | 天津大学 | Fuel supply device of pulverized coal combustion test equipment |
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2015
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114838863A (en) * | 2022-03-15 | 2022-08-02 | 华能伊敏煤电有限责任公司 | Heat dissipation ventilation volume monitoring and alarming device for 220T dumper electric control cabinet |
| CN114707246A (en) * | 2022-04-08 | 2022-07-05 | 中国航发沈阳发动机研究所 | Correction method for flow distribution test data of main combustion chamber of aircraft engine |
| CN117472116A (en) * | 2023-12-26 | 2024-01-30 | 徐州鸿丰高分子材料有限公司 | Intelligent material conveying control system |
| CN117472116B (en) * | 2023-12-26 | 2024-03-19 | 徐州鸿丰高分子材料有限公司 | Intelligent material conveying control system |
| CN118328415A (en) * | 2024-05-13 | 2024-07-12 | 天津大学 | Fuel supply device of pulverized coal combustion test equipment |
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