A method for correcting the compressed air consumption in the overall performance test of a unit

Abstract

The present invention discloses a method for correcting the compressed air consumption during the overall performance test of a unit, which includes the steps of: A. Before the overall performance test of the unit, obtain the theoretical gas consumption of each compressed air user and equipment in the whole plant under the rated load through design data, which is divided into three categories: instrument compressed air, miscellaneous compressed air, and ash conveying compressed air; B. Determine the output guarantee value and heat consumption rate guarantee value of the unit under the rated load condition and partial load condition; C. Calculate the compressed air consumption of the unit under the partial load condition; D. In the subsequent performance test calculation, the calculation of the power consumption of the air compressor system under the partial load condition is based on the calculated gas consumption. Using the correction method provided by the present invention, the factors affecting the compressed air consumption can be corrected to the design conditions, which helps to compare the overall performance test results of thermal power units with the design guarantee values.

Description

Technical Field

[0001] The present invention belongs to the field of thermal performance tests of thermal power units, and particularly relates to a method for correcting the compressed air consumption in the overall performance test of the unit. Background Art

[0002] Among the power plant equipment of thermal power units, the power consumption of power plant auxiliary equipment is an extremely important guarantee index in the performance assessment test of thermal power units, which has a direct impact on the overall performance test results of thermal power units. It is not only an important part of the unit's power supply coal consumption, but also an important index reflecting the power consumption of the unit's auxiliary equipment.

[0003] Due to the presence of compressed air storage tanks in the compressed air system of thermal power units, and the compressed air storage tanks are generally calibrated by the pressure inside the tanks, it is impossible to directly and effectively measure or count the consumption of compressed air. The air compressor system of thermal power units, as a main auxiliary system of thermal power units, has an electric power consumption value closely related to the consumption of compressed air, and the design data often only gives the consumption of compressed air for each compressed air user under rated load. Since the overall performance test of the unit is often carried out at multiple load points, a method is needed to determine the consumption of compressed air under partial load conditions.

[0004] In summary, a method for correcting the consumption of compressed air under partial load conditions is needed to make the consumption of the compressed air system in the overall performance test of thermal power units closer to the actual consumption, so as to make the overall performance test results of thermal power units more accurate. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for correcting the consumption of compressed air in the overall performance test of the unit. In the overall performance test of thermal power units, the method provided by the present invention can correct the actual consumption of the compressed air system to the corresponding design conditions.

[0006] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0007] A method for correcting the consumption of compressed air in the overall performance test of the unit, comprising the following steps:

[0008] A. Before the overall performance test of the unit, determine the theoretical gas consumption of each compressed air user and equipment in the whole plant under rated load;

[0009] B. Determine the output guarantee value and heat rate guarantee value of the unit under rated load conditions and partial load conditions;

[0010] C. Calculate the consumption of compressed air of the unit under partial load conditions;

[0011] D. In subsequent performance test calculations, the power consumption of the air compressor system under partial load conditions is calculated based on the calculated air consumption.

[0012] A further improvement of the present invention lies in that in step A, the theoretical air consumption of each compressed air user and equipment in the whole plant under rated load is obtained through design data.

[0013] A further improvement of the present invention lies in that in step A, the compressed air in the thermal power plant is used for instrument compressed air.

[0014] A further improvement of the present invention lies in that in step A, the compressed air in the thermal power plant is used for miscellaneous compressed air.

[0015] A further improvement of the present invention lies in that in step A, the compressed air in the thermal power plant is used for ash conveying compressed air.

[0016] A further improvement of the present invention lies in that in step B, the output guarantee value and the heat rate guarantee value of the unit under rated load conditions and partial load conditions are determined through unit design data and contract content.

[0017] A further improvement of the present invention lies in that in step C, the air consumption is calculated by the formula (1):

[0018]

[0019] where F partial is the air consumption of the compressed air of the unit under partial load conditions, with the unit of Nm3 / h; F instrument is the instrument compressed air volume, with the unit of Nm3 / h; F service is the miscellaneous compressed air volume, with the unit of Nm3 / h; F ash_handling is the ash conveying compressed air volume under rated load conditions, with the unit of Nm3 / h; HR partial is the heat rate guarantee value under partial load conditions, with the unit of kJ / (kW·h); HR rated is the heat rate guarantee value under rated load conditions, with the unit of kJ / (kW·h); P partial is the output guarantee value under partial load conditions, with the unit of kW; P rated is the output guarantee value under rated load conditions, with the unit of kW.

[0020] A further improvement of the present invention lies in that the overall performance test of the unit is carried out according to steps A to D. Under partial load conditions, the power consumption of the calculated compressed air system can reflect the power consumption value of the system under design conditions.

[0021] The present invention has at least the following beneficial technical effects:

[0022] In the overall performance test of a thermal power unit, the influencing factors of the compressed air system's gas consumption can be corrected to the design conditions by using the correction method provided by the present invention, so that the obtained compressed air system gas consumption can reflect the gas consumption under the design conditions, which helps to compare the overall performance test results of the thermal power unit with the design guarantee values. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0025] As shown in the Figure 1 flow chart, a method for correcting the compressed air gas consumption in the overall performance test of a unit provided by the present invention includes the following steps:

[0026] A. Before the overall performance test of the unit, obtain the theoretical gas consumption of each compressed air user and equipment in the whole plant under the rated load condition through design data. Generally, the uses of compressed air in a thermal power plant are mainly divided into three categories: instrument compressed air, miscellaneous compressed air, and ash conveying compressed air (for conveying boiler fly ash). Proceed to step B;

[0027] B. Determine the output guarantee value and heat rate guarantee value of the unit under the rated load condition and partial load conditions through the unit design data and contract content. Proceed to step C;

[0028] C. The gas consumption of compressed air under partial load conditions of the unit is calculated by formula (1):

[0029]

[0030] where, F partial is the gas consumption of compressed air under partial load conditions of the unit, with the unit of Nm3 / h; F instrument is the instrument compressed air volume, with the unit of Nm3 / h; F service is the miscellaneous compressed air volume, with the unit of Nm3 / h; F ash_handling is the ash conveying compressed air volume under the rated load condition, with the unit of Nm3 / h; HRpartial is the guaranteed heat rate value under partial load conditions, with the unit of kJ / (kW·h); HR rated is the guaranteed heat rate value under rated load conditions, with the unit of kJ / (kW·h); P partial is the guaranteed output value under partial load conditions, with the unit of kW; P rated is the guaranteed output value under rated load conditions, with the unit of kW. Proceed to step D;

[0031] D. In subsequent performance test calculations, the power consumption of the air compressor system under partial load conditions is calculated based on F partial for calculation. Proceed to step E;

[0032] E. Conduct the overall unit performance test according to steps A - D. Under partial load conditions, the calculated power consumption of the compressed air system can reflect the power consumption value of the system under design conditions.

[0033] Embodiment

[0034] The following is an example of the electricity consumption correction calculation for the lighting system of a certain thermal power project:

[0035] Table 1 Theoretical air consumption of compressed air users and equipment in a certain thermal power project under rated load

[0036]

[0037] Table 2 Theoretical air consumption of compressed air users and equipment in a certain thermal power project under 60% rated load

[0038]

[0039] As can be seen from Table 2, in this example, the theoretical air consumption of compressed air under 60% rated load is 40419.97 Nm3 / h. In subsequent performance test calculations, the power consumption of the air compressor system under partial load conditions is calculated based on 40419.97 Nm3 / h. Then, the calculated power consumption of the compressed air system in this test can reflect the power consumption value of the system under design conditions.

[0040] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it on the basis of the present invention, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A method for correcting the compressed air consumption in the overall performance test of a unit, characterized in that It includes the following steps: A. Before the overall performance test of the unit, determine the theoretical air consumption of each compressed air user and equipment in the whole plant under the rated load. The theoretical air consumption is divided into three categories: instrument compressed air, miscellaneous compressed air, and ash conveying compressed air; B. Determine the output guarantee value and heat consumption rate guarantee value of the unit under the rated load condition and partial load conditions; C. Calculate the air consumption of the unit under the partial load condition; the air consumption is calculated through formula (1): （1） Among them, is the consumption of compressed air under partial load conditions of the unit, with the unit of Nm 3 / h; is the instrument air consumption, with the unit of Nm 3 / h; is the miscellaneous air consumption, with the unit of Nm 3 / h; is the ash conveying compressed air volume under rated load conditions, with the unit of Nm 3 / h; is the guaranteed value of heat rate under partial load conditions, with the unit of kJ / (kW•h); is the guaranteed value of heat rate under rated load conditions, with the unit of kJ / (kW•h); is the guaranteed value of output under partial load conditions, with the unit of kW; is the guaranteed value of output under rated load conditions, with the unit of kW; D. In the subsequent performance test calculation, the power consumption of the air compressor system under the partial load condition is calculated based on the calculated air consumption.

2. A method for correcting the compressed air consumption in the overall performance test of the unit according to claim 1, characterized in that, In step A, obtain the theoretical air consumption of each compressed air user and equipment in the whole plant under the rated load through the design data.

3. A method for correcting the compressed air consumption in the overall performance test of a unit, as described in claim 1, characterized in that, In step B, determine the output guarantee value and heat consumption rate guarantee value of the unit under the rated load condition and partial load conditions through the unit design data and contract content.

4. A method for correcting the compressed air consumption in the overall performance test of a unit, as described in claim 1, characterized in that Conduct the overall performance test of the unit according to steps A to D. Under the partial load condition, the calculated power consumption of the compressed air system can reflect the power consumption value of the system under the design conditions.

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