A method for evaluating the energy consumption of a coal-fired power plant boiler ash conveying

Abstract

The present application relates to a kind of boiler ash conveying energy consumption evaluation method of thermal power generating unit, contain a kind of boiler ash conveying energy consumption monitoring system of thermal power generating unit, including compressed air main pipe, multiple ash conveying pipelines, valve, several silo pumps, ash silo and several pressure gauges;At least one silo pump is connected on each ash conveying pipeline, form multiple parallel ash conveying branch, and one end of multiple ash conveying branch is connected to compressed air main pipe after parallel connection, other end is connected with ash silo;Pressure gauge is installed in the downstream of each described silo pump, and first pressure gauge is installed in the inlet end of each ash conveying branch close to compressed air main pipe side;Valve of each ash conveying branch is installed between the first pressure gauge and the silo pump closest to the first pressure gauge;The inlet end of the compressed air main pipe is installed with pressure gauge and is connected with air compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler ash conveying technology, in particular to a method for evaluating the energy consumption of ash conveying of a boiler of a thermal power generating unit. BACKGROUND

[0002] At present, fly ash of large coal-fired boilers is mostly conveyed by pneumatic conveying, which has the advantage that the fly ash can be utilized compared with wet conveying.

[0003] Energy saving is increasingly valued in ash conveying, and at present, the air consumption is mostly used to evaluate the economy, which is actually not accurate enough, because the energy consumption is different under different pressures using the same amount of air, so the ash conveying energy consumption should be used to evaluate the economy.

[0004] The present application provides a method for calculating the ash conveying energy consumption, and has requirements for related measuring instruments, so as to monitor the energy consumption of each ash conveying pipeline, and accurately evaluate the ash conveying energy consumption.

[0005] At the same time, the current ash conveying pipeline does not install related devices capable of detecting pipe blockage, so that it is difficult to determine the position after pipe blockage, and since the ash concentration in the pipeline is high, the pressure measuring pipe of the pressure measuring device is easily blocked, which brings difficulties to pressure measurement. SUMMARY

[0006] In order to solve the problems existing in the prior art, the present application provides a method for evaluating the ash conveying energy consumption of a boiler of a thermal power generating unit.

[0007] The technical scheme of the present application is as follows:

[0008] On the one hand, the present application provides a method for evaluating the ash conveying energy consumption of a boiler of a thermal power generating unit, which comprises an ash conveying energy consumption monitoring system of a boiler of a thermal power generating unit, including a compressed air main pipe, a plurality of ash conveying pipelines, valves, a plurality of bunker pumps, an ash bunker, and a plurality of pressure gauges; at least one bunker pump is connected to each ash conveying pipeline to form a plurality of parallel ash conveying branches, and one end of the parallel ash conveying branches is connected to the compressed air main pipe, and the other end is connected to the ash bunker; a pressure gauge is installed downstream of each bunker pump, and a first pressure gauge is installed at the inlet end of each ash conveying branch close to the compressed air main pipe; the valve of each ash conveying branch is installed between the first pressure gauge and the bunker pump closest to the first pressure gauge; a pressure gauge is installed at the inlet end of the compressed air main pipe and connected to an air compressor;

[0009] The ash conveying energy consumption monitoring system further comprises a flow meter and a thermometer, and a flow meter and a thermometer are installed at the installation position of all pressure gauges in the ash conveying energy consumption monitoring system;

[0010] A level meter is further arranged in the ash bunker, and the level meter is used to detect the fly ash inventory in the ash bunker;

[0011] The air compressor is provided with an atmospheric pressure gauge for detecting the atmospheric pressure value near the air compressor;

[0012] Based on the above-mentioned coal-fired power unit boiler ash conveying energy consumption monitoring system, the real-time ash conveying pressure values at each calculation point are obtained according to the pressure gauges on each ash conveying branch under different ash conveying conditions ;

[0013] The real-time atmospheric pressure values and the average flow rates at each calculation point are obtained through the atmospheric pressure gauges and the flow meters ;

[0014] The ash conveying energy consumption of the entire ash conveying system is calculated by using the real-time ash conveying pressure values , the real-time atmospheric pressure values , and the average flow rates at each calculation point ; ;

[0015] The step of calculating the ash conveying energy consumption of the entire ash conveying system by using the real-time ash conveying pressure values , the real-time atmospheric pressure values , and the average flow rates at each calculation point specifically includes the following steps:

[0016]

[0017] In the formula, is the ash conveying energy consumption, m is the number of discrete calculation points, is the average flow rate at the i-th calculation point, is the time interval of the i-th calculation point, is the atmospheric pressure; The value of has two cases. The first case is when multiple ash conveying branches convey ash at the same time, represents the ash conveying pressure of the i-th calculation point; the second case is when each ash conveying branch conveys ash separately, represents the ash conveying pressure of each ash conveying branch;

[0018] The air consumption at each calculation point is calculated by using the temperature and average flow rate at each calculation point .

[0019] As a preferred embodiment, the different ash conveying conditions include multiple ash conveying branches conveying ash at the same time and each ash conveying branch conveying ash separately; under different ash conveying conditions, the enabling mode of the pressure gauges includes:

[0020] In the case of multiple ash conveying branches conveying ash at the same time, the pressure gauges upstream and downstream of each bin pump are enabled to measure the ash conveying pressure values at the bin pump points; ​

[0021] In the case of separate conveying of ash in each ash conveying branch, the ash conveying pressure value of each ash conveying branch is measured by the first pressure gauge close to the compressed air main pipe.

[0022] As a preferred embodiment, the air consumption at each calculation point is calculated by using the compressed air density and the average flow at each calculation point. The step of calculating the air consumption at each calculation point is specifically:

[0023]

[0024] wherein, is the air consumption, is the compressed air density of the i-th calculation point.

[0025] On the other hand, the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for evaluating the ash conveying energy consumption of a boiler of a thermal power unit according to any one of the embodiments of the present application when executing the program.

[0026] On the other hand, the present application provides a computer readable storage medium having a computer program stored thereon, wherein the program is executable on a processor to implement the method for evaluating the ash conveying energy consumption of a boiler of a thermal power unit according to any one of the embodiments of the present application.

[0027] The present application has the following beneficial effects:

[0028] 1. The present application is installed with pressure gauges at the downstream of each silo pump and at the connecting positions and corner positions of the ash conveying system, so that the blocked pipe position can be accurately determined after the pipe is blocked.

[0029] 2. The present application evaluates the economy of the entire ash conveying system by calculating the ash conveying energy consumption of the entire ash conveying system, which is more accurate than the existing scheme of evaluating the economy of the ash conveying system according to the air consumption, and can also monitor the running status of the entire system in real time. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the structure diagram of the ash conveying system of the present application.

[0031] The reference signs in the drawings are as follows:

[0032] 1. compressed air main pipe; 2. ash conveying pipe; 3. valve; 4. silo pump; 5. ash silo; 6. pressure gauge; 7. flow meter; 8. temperature gauge; 9. level gauge. DETAILED DESCRIPTION

[0033] Clearly, the embodiments described are only a part of all the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0034] It should be understood that the step numbers used herein are only for the convenience of description, and are not limited to the execution sequence of the steps.

[0035] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] The terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] The term "and / or" means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0038] Embodiment one:

[0039] Referring to Figure 1 , the coal-fired power unit boiler ash conveying energy consumption monitoring system of the present embodiment comprises a compressed air main pipe 1, a plurality of ash conveying pipelines 2, valves 3, a plurality of silo pumps 4, an ash silo 5, and a plurality of pressure gauges 6. At least one silo pump 4 is connected to each ash conveying pipeline 2, forming a plurality of parallel ash conveying branches, and one end of the plurality of parallel ash conveying branches is connected to the compressed air main pipe, and the other end is connected to the ash silo 5. A pressure gauge 6 is installed downstream of each silo pump 4, and a first pressure gauge 6 is installed at the inlet end of each ash conveying branch close to the compressed air main pipe 1. The valve 3 of each ash conveying branch is installed between the first pressure gauge 6 and the silo pump 4 closest to the first pressure gauge 6. The inlet end of the compressed air main pipe 1 is provided with a pressure gauge 6 and is connected to an air compressor.

[0040] In specific implementation, the pressure gauges need to measure the ash conveying pressure value when the ash conveying system is blocked, so as to determine the blocked position. Since the ash concentration in the ash conveying pipeline is high after the pipe is blocked, it is easy to block the pressure taking pipe of the pressure testing device, so the selected pressure gauges 6 need to have a structure to prevent fly ash from blocking.

[0041] At the same time, the pressure gauges 6 are selected to be installed downstream of the respective silo pumps and at the bends of the respective ash conveying pipes where dust is prone to accumulate, which facilitates subsequent calculation of the ash conveying energy consumption and real-time monitoring of the positions of the pressure gauges 6.

[0042] As a preferred embodiment of the present embodiment, the ash conveying energy consumption monitoring system further comprises flow meters 7 and thermometers 8, and the flow meters 7 and thermometers 8 are installed at the installation positions of all the pressure gauges 6 in the ash conveying energy consumption monitoring system.

[0043] In actual use, the installation positions of the flow meters depend on the starting positions at which the energy consumption needs to be calculated, and normally the energy consumption is calculated from the outlet of the air compressor, but in general the air compressor has other gas supply tasks, so the flow meters 7 need to be installed at the starting position of the ash conveying main pipe, i.e., the compressed air main pipe 1, so the installation position of the flow meter 7 on the compressed air main pipe 1 is as shown in FIG. 2. Figure 1

[0044] At the same time, the flow rate needs to be measured at each calculation point, and in order to ensure the accuracy of the monitoring results, flow meters 7 and thermometers 8 are installed at all the pressure gauges 6, and all the flow meters 7, thermometers 8 and pressure gauges 6 are installed at the same positions, so that the parameters measured are the parameters of the same positions.

[0045] As a preferred embodiment of the present embodiment, a level meter 9 is further arranged in the ash silo 5, and the level meter 9 is used to detect the fly ash inventory in the ash silo 5.

[0046] In actual use, the fly ash inventory in the ash silo 5 is monitored according to the level meter 9, and the level meter 9 is connected to an alarm device, so that when the fly ash reaches a certain height or quantity, the level meter sends a reminder signal, thereby completing the timely cleaning of the fly ash in the ash silo 5.

[0047] As a preferred embodiment of the present embodiment, an atmospheric pressure gauge is installed at the air compressor, which is used to detect the atmospheric pressure value near the air compressor.

[0048] In specific implementation, the atmospheric pressure value generally does not change, and in calculation of the ash conveying energy consumption, a fixed value is generally taken, but if a large change in the atmospheric pressure value is found, the corresponding value needs to be changed in calculation.

[0049] Embodiment Two

[0050] A method for evaluating the ash conveying energy consumption of a boiler of a thermal power unit, the evaluation method comprising the following steps:

[0051] Based on the ash conveying energy consumption monitoring system of the boiler of the thermal power unit, real-time ash conveying pressure values at the calculation points are obtained according to the pressure gauges on the respective ash conveying branches under different ash conveying conditions .

[0052] ​Real-time atmospheric pressure values ​​are obtained using a barometer and various flow meters. and the average flow rate at each calculation point ;

[0053] Using real-time ash conveying pressure value and real-time atmospheric pressure values and the average flow rate at each calculation point Calculate the energy consumption of the entire ash conveying system. ;

[0054] Using the temperature and average flow rate at each calculation point Calculate the air consumption at each calculation point. .

[0055] In a preferred embodiment of this invention, the different ash conveying situations include simultaneous ash conveying by multiple ash conveying branches and separate ash conveying by each ash conveying branch; under different ash conveying situations, the pressure gauge can be activated in the following ways:

[0056] When multiple ash conveying branches are conveying ash simultaneously, pressure gauges upstream and downstream of each silo pump are used to measure the ash conveying pressure at each silo pump point.

[0057] When ash is conveyed separately on each ash conveying branch, the ash conveying pressure value of the ash conveying branch is measured by the first pressure gauge on each ash conveying branch that is close to the compressed air main pipe.

[0058] In practice, when ash is conveyed separately on each ash conveying branch, the following should be activated: Figure 1 The pressure gauges at points A, B, and C shown can be used to open and close each ash conveying branch by using valves on each ash conveying branch. This allows multiple ash conveying branches to work simultaneously or each ash conveying branch to work separately.

[0059] As a preferred embodiment of this invention, the real-time ash conveying pressure value is utilized. and real-time atmospheric pressure values and the average flow rate at each calculation point Calculate the energy consumption of the entire ash conveying system. The specific steps are as follows:

[0060]

[0061] In the formula, Here, m represents the energy consumption for ash conveying, and m represents the number of discrete calculation points. Let i be the average flow rate at the i-th calculation point. The time interval for calculating the i-th point is... Atmospheric pressure; There are two possible values ​​for this value. The first is when multiple ash conveying branches are conveying ash simultaneously. The first method represents the ash conveying pressure at the i-th calculation point; the second method is when each ash conveying branch conveys ash separately. This represents the ash conveying pressure of each ash conveying branch.

[0062] In practical implementation, one point to note is that the number of discrete calculation points m is mostly discrete data in the computer. Multiple points in the computer can be merged and averaged into one point for calculation, which can reduce the amount of calculation.

[0063] As a preferred embodiment of this invention, the compressed air density at each calculation point is utilized. and average flow Calculate the air consumption at each calculation point. The specific steps are as follows:

[0064]

[0065] In the formula, M is the air volume. Let be the compressed air density at the i-th calculation point.

[0066] In practice, since the air consumption required at each point can be calculated in advance, and the real-time air consumption at each point can be calculated based on real-time parameters, the two can be compared to find out if there are any abnormalities in the operation of the ash conveying system. Combined with the structure of the ash conveying system, the faults of the ash conveying system can be quickly detected and resolved.

[0067] Example 3:

[0068] This embodiment discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements a method for evaluating the ash conveying energy consumption of a thermal power unit boiler as described in any embodiment of the present invention.

[0069] Example 4:

[0070] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for evaluating the ash conveying energy consumption of a thermal power unit boiler as described in any embodiment of the present invention.

[0071] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for evaluating the energy consumption of a coal-fired power plant boiler ash handling system, characterized in that, The invention discloses a boiler ash conveying energy consumption monitoring system for a thermal power unit, which comprises a compressed air main pipe (1), a plurality of ash conveying pipes (2), valves (3), a plurality of silo pumps (4), an ash silo (5), and a plurality of pressure gauges (6). Each of the ash conveying pipes (2) is connected with at least one silo pump (4) to form a plurality of parallel ash conveying branches, and one end of the parallel ash conveying branches is connected to the compressed air main pipe, and the other end is connected to the ash silo (5). Each of the silo pumps (4) is provided with a pressure gauge (6) downstream, and each of the ash conveying branches is provided with a first pressure gauge (6) at an inlet end close to the compressed air main pipe (1). Each of the valves (3) of the ash conveying branches is installed between the first pressure gauge (6) and the silo pump (4) closest to the first pressure gauge (6). The inlet end of the compressed air main pipe (1) is provided with a pressure gauge (6) and is connected to an air compressor. The ash conveying energy consumption monitoring system further comprises a flow meter (7) and a thermometer (8), and the flow meter (7) and the thermometer (8) are installed at the installation positions of all the pressure gauges (6) in the ash conveying energy consumption monitoring system. The ash silo (5) is further provided with a material level meter (9) inside, and the material level meter (9) is used for detecting the fly ash inventory in the ash silo (5). An atmospheric pressure gauge is installed at the air compressor to detect the atmospheric pressure value near the air compressor. Based on the above coal-fired power unit boiler ash conveying energy consumption monitoring system, according to the pressure gauge on each ash conveying branch under different ash conveying conditions, the real-time ash conveying pressure value at each calculation point is obtained ; Real-time atmospheric pressure values are obtained by means of an atmospheric pressure gauge and the respective flow meters and the average flow at each calculation point ; Utilizing real-time values of the pressure of the conveying gas and the atmospheric pressure and the average flow at each calculation point to calculate the conveying energy of the entire conveying system ; The step of utilizing the real-time conveying pressure value and the real-time atmospheric pressure value and the average flow at each calculation point calculates the conveying energy consumption of the entire conveying system is specifically as follows: wherein, is the energy consumption of conveying ash, m is the number of discrete calculation points, is the average flow rate at the i-th calculation point, is the time interval of the i-th calculation point, is the atmospheric pressure; The value of has two cases, the first is when multiple conveying ash branches convey ash at the same time, represents the conveying ash pressure of the i-th calculation point; the second is when each conveying ash branch conveys ash respectively, represents the conveying ash pressure of each conveying ash branch; The air usage at each calculation point is calculated using the temperature and average flow at each calculation point The air usage at each calculation point is calculated using the temperature and average flow at each calculation point .

2. The method according to claim 1, wherein, The different ash conveying conditions include simultaneous ash conveying of the plurality of ash conveying branches and separate ash conveying of the ash conveying branches. Under different ash conveying conditions, the pressure gauges are enabled in the following modes: Under the condition of simultaneous ash conveying of the plurality of ash conveying branches, the pressure gauges upstream and downstream of each of the silo pumps are enabled to measure the ash conveying pressure values at the silo pump points. Under the condition of separate ash conveying of the ash conveying branches, the first pressure gauges close to the compressed air main pipe on the ash conveying branches are enabled to measure the ash conveying pressure values of the ash conveying branches.

3. The method according to claim 1, characterized in that, The compressed air density at each calculation point is used. and average flow Calculate the air consumption at each calculation point. The specific steps are as follows: wherein for the air quantity, is the compressed air density at the i-th calculation point.

4. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the boiler ash conveying energy consumption evaluation method according to any one of claims 1 to 3.

5. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the boiler ash conveying energy consumption evaluation method according to any one of claims 1 to 3.

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