A system and method for automatically calculating the time of switching between types of coal in a coal bunker

Abstract

The present invention discloses a system and method for automatically calculating the time for switching types of coal in a coal bunker, including arranging a coal bunker level meter on the coal bunker, a coal feeding flow meter and a data acquisition system on the coal bunker, the output end of the coal feeding flow meter and the data acquisition system is connected to the input end of a data receiving system through an existing network switch of a power station, the output end of the data receiving system is connected to the input end of a data processing system, and the client end of a publishing system is connected to the service end of the data processing system. The present invention utilizes the height measured in real time by the coal bunker level meter before the newly loaded coal enters the coal bunker and the coal feeding flow measured in real time by the coal feeding flow meter to automatically calculate the switching time when the original coal in the coal bunker is used up and the newly loaded coal leaves the coal bunker in real time.

Description

Technical Field

[0001] The invention relates to the technical field of soft measurement of industrial coal-fired boilers and power station coal-fired boilers, and in particular to a system and method for automatically calculating the time for switching between types of coal in a coal bunker. Background Art

[0002] Coal-fired boiler combustion requires that different types of coal be regularly transported to the coal bunker in batches for combustion. In this way, there are generally two different types of coal stored in the coal bunker at the same time. The lower part of the coal bunker is the original coal, and the upper part is the new coal. With the continuous consumption of coal, the original coal in the lower part is gradually used up, and the new coal in the upper part immediately leaves the coal bunker and enters the boiler for combustion. For operators, it is necessary to grasp the approximate time when the new coal in the coal bunker leaves the coal bunker and enters the boiler for combustion adjustment. Various combustion optimization and analysis also require the approximate time when the new coal enters the furnace.

[0003] Generally, operators make estimates or make judgments based on the original coal storage in the coal bunker. This method has the following disadvantages:

[0004] (1) Inaccurate time;

[0005] (2) The time of switching between the original stored coal and the newly added coal cannot be collected in real time. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a system and method for automatically calculating the switching time of coal types in a coal bunker. The system utilizes the height measured in real time by the coal bunker level meter before the new coal enters the coal bunker and the coal flow rate measured in real time by the coal flow meter to automatically calculate in real time the switching time when the original coal in the coal bunker is used up and the new coal leaves the coal bunker.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A system for automatically calculating the time for switching coal types in a coal bunker comprises a coal bunker level meter 1 arranged on the coal bunker, a coal flow meter 2 and a data acquisition system 3 are arranged on the coal bunker, the output ends of the coal flow meter 2 and the data acquisition system 3 are connected to the input end of a data receiving system 4 through an existing network switch of a power station, the output end of the data receiving system 4 is connected to the input end of a data processing system 5, and the client end of a publishing system 6 is connected to the server end of the data processing system 5.

[0009] There is at least one coal bunker level meter 1, each of which is located at the top of the coal bunker.

[0010] The coal bunker level meter 1 measures the height of the coal bunker in real time, and the coal flow meter 2 measures the coal flow in real time. The real-time data measured by the coal bunker level meter 1 and the coal flow meter 2 are collected and summarized by the data acquisition system 3.

[0011] The coal feed flow meter 2 is located at the bottom of the coal bunker, and the data acquisition system 3 is located in the production control area of ​​the power station.

[0012] The data receiving system 4 is responsible for receiving and transferring the real-time data to the data processing system 5 for data modification. The data processing system 5 is used for automatically calculating the coal type switching time in the coal bunker.

[0013] The coal bunker level meter 1 and the coal feed flow meter 2 are connected to the coal bunker coal feeding system 7 respectively.

[0014] The coal bunker level meter 1 and the coal feed flow meter 2 are used for automatic data collection. When multiple coal bunker level meters 1 are provided, the heights of the coal bunker level meters 1 are automatically averaged and output.

[0015] The data acquisition system 3 (TPRI-DBProxy), the data receiving system 4 (TPRI-DBProxy), the data processing system 5 (TPRI-CalcStation), and the data publishing system 6 (TPRI-SIS) are composed of related software and servers; the coal bunker adding system 7 is provided for the original power plant coal loading system, and provides a coal adding signal data output mode to be transmitted to the data acquisition system 3 as needed.

[0016] A method for automatically calculating the coal type switching time in a coal bunker comprises the following steps:

[0017] Step 1:

[0018] Preliminary analysis shows that the functional relationship between the height of the coal bunker level meter 1 and the coal bunker capacity is as follows:

[0019] V x =f(H x )

[0020] Among them, V x —Coal bunker level meter in H x The corresponding coal storage volume at the height, m 3 ;

[0021] H x —Height of coal bunker level meter, m.

[0022] Step 2:

[0023] The data processing system 5 analyzes the coal bunker level meter data in real time. When the coal bunker level meter 1 data changes from decreasing to increasing, it means that new coal has entered the coal bunker. The data processing system 5 records the time t 1 And coal bunker level meter height H 1 ;

[0024] Step 3:

[0025] According to the functional relationship between the height of the coal bunker level meter and the coal bunker capacity, the data processing system 5 calculates t 1 The original coal stored in the coal bunker at the moment is as follows:

[0026] M 1 =ρV 1 =ρf(H 1 )

[0027] Among them, M 1 —Coal bunker level meter at t 1 The original coal storage quantity at the time, t;

[0028] ρ—Bulk density of original coal, t / m 3 ;

[0029] V 1 —Height of coal bunker level meter H 1 Coal storage capacity at the time, m 3 .

[0030] Step 4:

[0031] Data processing system 5 from t 1 The coal consumption is calculated based on the real-time coal feeder flow rate at all times, as follows:

[0032]

[0033] Among them, M t1+tx —Coal bunker level meter at t 1 From time t x Calculated coal consumption after time, t;

[0034] m t —Real-time flow of coal feeder, t / h.

[0035] Step 5:

[0036] In the data processing system 5, when M t1+tx Greater than M 1 , record this time t 2 , this moment is the time when the original coal is used up and the new coal is switched. At this moment t 2 New coal begins to leave the coal bunker;

[0037] Step 6:

[0038] Regularly revise ρ and correct the calculation results.

[0039] In step 2, the coal adding signal of the coal bunker coal adding system 7 is collected as the time t when the new coal enters the coal bunker. 1 .

[0040] Beneficial effects of the present invention:

[0041] Through a system and method for automatically calculating the time for switching coal types in a coal bunker, automatic calculation of switching coal types in a coal bunker can be achieved on the basis of utilizing an existing system, thus solving the original method of manual judgment and improving its accuracy, reliability and timeliness.

[0042] Since it can timely and accurately determine the time of coal type switching in the coal bunker, it can remind the operating personnel to make corresponding combustion adjustments based on changes in coal quality, providing basic information for boiler combustion operation adjustments, and at the same time providing information on the combustion coal type for various combustion optimization and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the coal bunker just before new coal is loaded.

[0044] Figure 2 Schematic diagram of new coal and existing coal in the coal bunker.

[0045] Figure 3 Schematic diagram of newly loaded coal leaving the coal bunker.

[0046] Figure 4 System layout diagram.

[0047] Figure 5 Calculation flow chart. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] like Figure 1-Figure 4 As shown:

[0050] 1. Determine the project implementation plan design according to the specific conditions of the power plant:

[0051] Design the specific system physical architecture based on the network and operating system conditions.

[0052] 2. System Installation

[0053] (1) Install a data acquisition system 3, a data receiving system 4, a data processing system 5, a data publishing system 6, and a coal bunker adding system 7 on the server; (e.g. Figure 4 (shown)

[0054] (2) Install one or more coal bunker level meters 1 on the top of the coal bunker; (e.g. Figure 1 (shown)

[0055] (3) Install a coal flow meter 2 at the bottom of the coal bunker; (e.g. Figure 3 (shown)

[0056] (4) The real-time data of the coal bunker level meter 1 and the coal flow meter 2 are connected to the data acquisition system 3. If multiple coal bunker level meters 1 are installed, the data of all coal bunker level meters 1 are arithmetic averaged in the data processing system 5;

[0057] 3. Debugging

[0058] (1) Start the coal feeder for 5 minutes and check whether the coal bunker level meter 1 and coal feed flow meter 2 are operating normally;

[0059] (2) When the coal feeder is started, the arithmetic average calculation of the coal bunker level meter 1 and the cumulative value calculation of the coal consumption of the coal feed flow meter 2 are started;

[0060] (3) Record the calculation results in the previous step and compare them with the manually measured data. If there is a large deviation in the data, the system should be adjusted to meet the test conditions;

[0061] 4. Verification test

[0062] (1) Measure the bulk density ρ of the original coal using the standard bucket method;

[0063] (2) starting the data processing system 5 to record the original coal storage information in the coal feeder;

[0064] (3) After the coal feeder is started for a period of time, new coal begins to be added to the coal bunker;

[0065] (4) When the data distribution system 6 sends a signal that the new coal starts to leave the coal bunker, the coal feeder is turned off;

[0066] (5) Check the coal sample in the coal feeder on site and compare it with the original coal and the newly added coal. If it is different from the original coal, it means that the newly added coal has begun to leave the coal bunker.

[0067] 5. Results of automatic calculation of coal type switching time

[0068] The operator can adjust and optimize the boiler combustion in time according to the result of the automatic calculation of the coal type switching time, thus avoiding the boiler combustion problems caused by the untimely switching of coal types.

[0069] The present invention can not only automatically calculate in real time the switching time when the original coal in the coal bunker is used up and the new coal leaves the coal bunker, but also digitally store the switching time and related data at that moment, providing a data basis for subsequently predicting the time when the new coal leaves the coal bunker.

Claims

1. A system for automatically calculating the time for switching coal types in a coal bunker, characterized in that: The system comprises a coal bunker material level meter (1) arranged on the coal bunker, a coal flow meter (2) and a data acquisition system (3) arranged on the coal bunker, the output ends of the coal flow meter (2) and the data acquisition system (3) being connected to the input end of a data receiving system (4) through an existing network switch of the power station, the output end of the data receiving system (4) being connected to the input end of a data processing system (5), and the server end of the data processing system (5) being connected to the client end of a publishing system (6); Specifically include the following steps: Step 1: Preliminary analysis shows that the functional relationship between the height of the coal bunker level meter (1) and the coal bunker capacity is as follows: V x =f(H x ) Among them, V x —Coal bunker level meter in H x The corresponding coal storage volume at the height, m 3 ; H x —Height of coal bunker level meter, m; Step 2: The data processing system (5) analyzes the data of the coal bunker material level meter in real time. When the data of the coal bunker material level meter (1) changes from decreasing to increasing, it indicates that new coal has entered the coal bunker. The data processing system (5) records the time t1 and the height H1 of the coal bunker material level meter. Step 3: According to the functional relationship between the height of the coal bunker level meter and the coal bunker capacity, the data processing system (5) calculates the original coal stored in the coal bunker at time t1, and the formula is as follows: M1=ρV1=ρf(H1) Where, M1 is the original coal storage quantity of the coal bunker level meter at time t1, t; ρ—Bulk density of original coal, t / m 3 ; V1—coal storage volume when the coal bunker level gauge is at height H1, m 3 ; Step 4: The data processing system (5) calculates the coal consumption based on the real-time coal feeder flow rate from time t1 as follows: Among them, M t1+tx —The coal bunker level meter starts at time t1 and ends at time t x Calculated coal consumption after time, t; m t —Real-time flow rate of coal feeder, t / h; Step 5: In the data processing system 5, when M t1+tx When it is greater than M1, the moment t2 is recorded, which is the time when the original stored coal is used up and the new coal is switched. At this moment t2, the new coal starts to leave the coal bunker; Step 6: Regularly revise ρ and correct the calculation results.

2. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: There is at least one coal bunker level meter (1), each of which is located at the top of the coal bunker.

3. The automatic calculation system for coal type switching time in a coal bunker according to claim 2 is characterized in that: The coal bunker level meter (1) and the coal feed flow meter (2) are used for automatic data collection. When a plurality of coal bunker level meters (1) are provided, the heights of the coal bunker level meters (1) are automatically averaged and output.

4. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The coal flow meter (2) and the data acquisition system (3) are used for real-time data acquisition of the coal bunker level meter and the coal feed flow meter.

5. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The coal bunker level meter (1) measures the coal bunker level meter height in the coal bunker in real time, and the coal feed flow meter (2) measures the coal feed flow in real time. The real-time data measured by the coal bunker level meter (1) and the coal feed flow meter (2) are collected and summarized by a data collection system (3).

6. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The coal feed flow meter (2) is located at the bottom of the coal bunker, and the data acquisition system (3) is located in the production control area of ​​the power station.

7. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The data receiving system (4) is responsible for receiving and transferring the real-time data to the data processing system (5) for data modification. The data processing system (5) is used to automatically calculate the time for switching the types of coal in the coal bunker.

8. The automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The coal bunker material level meter (1) and the coal feed flow meter (2) are respectively connected to the coal bunker coal feeding system (7).

9. The calculation method of the automatic calculation system for coal type switching time in a coal bunker according to claim 1 is characterized in that: The steps include: Step 1: Preliminary analysis shows that the functional relationship between the height of the coal bunker level meter (1) and the coal bunker capacity is as follows: V x =f(H x ) Among them, V x —Coal bunker level meter in H x The corresponding coal storage volume at the height, m 3 ; H x —Height of coal bunker level meter, m; Step 2: The data processing system (5) analyzes the data of the coal bunker material level meter in real time. When the data of the coal bunker material level meter (1) changes from decreasing to increasing, it indicates that new coal has entered the coal bunker. The data processing system (5) records the time t1 and the height H1 of the coal bunker material level meter. Step 3: According to the functional relationship between the height of the coal bunker level meter and the coal bunker capacity, the data processing system (5) calculates the original coal stored in the coal bunker at time t1, and the formula is as follows: M1=ρV1=ρf(H1) Where, M1 is the original coal storage quantity of the coal bunker level meter at time t1, t; ρ—Bulk density of original coal, t / m 3 ; V1—coal storage volume when the coal bunker level gauge is at height H1, m 3 ; Step 4: The data processing system (5) calculates the coal consumption based on the real-time coal feeder flow rate from time t1 as follows: Among them, M t1+tx —The coal bunker level meter starts at time t1 and ends at time t x Calculated coal consumption after time, t; m t —Real-time flow rate of coal feeder, t / h; Step 5: In the data processing system 5, when M t1+tx When it is greater than M1, the moment t2 is recorded, which is the time when the original stored coal is used up and the new coal is switched. At this moment t2, the new coal starts to leave the coal bunker; Step 6: Regularly revise ρ and correct the calculation results.

10. The calculation method of the automatic calculation system for coal type switching time in a coal bunker according to claim 9 is characterized in that: In the step 2, the coal adding signal of the coal bunker coal adding system (7) is collected as the time t1 when the new coal enters the coal bunker.

Images