Method for evaluating online energy efficiency of heating furnace fan

Abstract

The invention relates to the technical field of fan energy efficiency evaluation, in particular to a heating furnace fan on-line energy efficiency evaluation method, which comprises the steps of establishing a fan theoretical power consumption model, acquiring real-time data of power consumption, fan outlet flow and pressure, and calculating the overall energy efficiency value of a fan system. According to the online energy efficiency evaluation method provided by the invention, the outlet flow and the outlet pressure of the fan are substituted into the established theoretical effective power consumption model, the theoretical effective power consumption is obtained, the ratio of the theoretical effective power consumption to the actual power consumption is calculated as the energy efficiency, the overall energy efficiency value of the fan system can be obtained, and the energy efficiency of the fan system can be evaluated according to relevant real-time data of fan operation. And the overall energy efficiency of the fan system is quantitatively evaluated, so that the overall energy-saving operation of the fan system can be guided.

Description

Technical Field

[0001] The invention relates to the technical field of fan energy efficiency assessment, and in particular to a method for online energy efficiency assessment of a heating furnace fan. Background Art

[0002] The slab heating furnace fan is one of the important equipment commonly used in the metallurgical industry. The metallurgical industry is an important branch of the industrial field, mainly involving the smelting, refining and processing of metal materials. Among them, hot rolling production is an important part of the metallurgical industry, covering a variety of metal materials such as steel, aluminum, etc. These metal billets need to go through a series of heating, rolling and other processes to ensure their mechanical properties.

[0003] In the process of heating the blank, the heating furnace blower is often needed. The heating furnace blower provides a large amount of oxygen required for the combustion of gas for the heating furnace. Its single power is often large and it is a continuous working system, so the blower has a high power consumption. The energy efficiency differences of its blower, drive motor, and transmission electrical device will lead to huge differences in the power consumption of the fan unit. Therefore, an effective online energy efficiency evaluation method has important guiding significance for the efficient and energy-saving operation of the fan unit. Summary of the invention

[0004] In order to solve the above-mentioned technical problems and overcome the shortcomings of the prior art, the present invention provides a method for online energy efficiency assessment of a heating furnace fan. The fan outlet flow rate and fan outlet pressure are introduced into an established theoretical effective power consumption model to obtain the theoretical effective power consumption, and then the ratio of the theoretical effective power consumption to the actual power consumption is calculated as the energy efficiency. The overall energy efficiency value of the fan system can be obtained, and the online energy efficiency of the heating furnace fan can be assessed in real time.

[0005] The method for online energy efficiency assessment of a heating furnace fan provided by the present invention comprises the following steps:

[0006] Establish theoretical power consumption model of fan;

[0007] Obtain real-time data on fan power consumption, fan outlet flow, and fan outlet pressure; and

[0008] Calculation of the overall energy efficiency value of the fan system.

[0009] The technical solution further defined in the present invention is:

[0010] Furthermore, the establishment of a theoretical power consumption model of a fan specifically includes:

[0011] According to the fluid pressure formula:

[0012] F=Hρg

[0013] Where H is the head, m; ρ is the air density, kg / m 3 ; g is the gravitational constant;

[0014] According to the above formula, substituting air density ρ and fan outlet pressure F, the head H can be calculated:

[0015]

[0016] The theoretical power formula of the fan is as follows:

[0017] P=QHρg,

[0018] Where Q is the fan outlet flow rate;

[0019] The theoretical effective power consumption model of the fan in time t is as follows:

[0020] W = ∫QHρgdt.

[0021] Furthermore, the real-time data of the fan power consumption, fan outlet flow rate, and fan outlet pressure are obtained, including:

[0022] Real-time acquisition of the meter motor input power W within time t 输入 ;

[0023] Get the fan outlet flow rate as Q;

[0024] The fan outlet pressure is obtained as F.

[0025] Furthermore, the calculation of the overall energy efficiency value of the fan system includes:

[0026] Substitute the fan outlet flow rate Q and fan outlet pressure F into the theoretical effective power consumption model to obtain the theoretical effective power consumption W, and then calculate its difference from the actual power consumption W. 输入 The ratio of is taken as the energy efficiency η to realize the online energy efficiency assessment of the heating furnace fan. The formula is as follows:

[0027]

[0028] The beneficial effects of the present invention are:

[0029] (1) The present invention brings the outlet flow rate and outlet pressure of the fan into the established theoretical effective power consumption model to obtain the theoretical effective power consumption W, and then calculates the ratio of the theoretical effective power consumption W to the actual power consumption as the energy efficiency, so as to obtain the overall energy efficiency value of the fan system and evaluate the online energy efficiency of the heating furnace fan in real time;

[0030] (2) The present invention provides a method for online energy efficiency assessment of a heating furnace fan, which relies on relevant real-time data of the fan operation to quantitatively evaluate the overall energy efficiency of the fan system, which helps to guide the overall energy-saving operation of the fan system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of a method for online energy efficiency assessment of a heating furnace fan in an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of energy efficiency statistics of a heating furnace fan in a wide and thick plate plant in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0033] This embodiment provides a method for online energy efficiency assessment of a heating furnace fan. The method can consider the influence of multiple factors, perform calculations based on relevant data provided by a field control system, and assess the energy efficiency of the fan group, which helps to guide the improvement of the energy efficiency of the fan group.

[0034] Figure 1 The present invention provides a flow chart of a method for online energy efficiency assessment of a heating furnace fan. The method includes steps S101 to S103, and the specific steps are described as follows:

[0035] Step S101: Establishing a theoretical power consumption model of a fan.

[0036] The specific implementation is as follows:

[0037] According to the fluid pressure formula:

[0038] F = Hρg;

[0039] Where, H is head, m; ρ is air density, kg / m 3 ;

[0040] The air density ρ and the fan outlet pressure F can be substituted into the above formula to calculate the lift H.

[0041] The theoretical power formula of the fan is as follows:

[0042] P=QHρg,

[0043] Where Q is the fan outlet flow rate;

[0044] The theoretical effective power consumption model of the fan over a period of time is as follows:

[0045] W = ∫QHρgdt;

[0046] Step S102: Acquisition of real-time data of power consumption, fan outlet flow rate, and pressure.

[0047] Step S103: Calculation of the overall energy efficiency value of the fan system.

[0048] The specific implementation is as follows:

[0049] Substitute the fan outlet flow rate Q and the fan outlet pressure F into the theoretical effective power consumption model to obtain the theoretical effective power consumption W, and then calculate its ratio to the actual power consumption as the energy efficiency. The calculation method is as follows:

[0050]

[0051] Figure 2 The figure is a statistical diagram of the energy efficiency of a slab heating furnace in a wide and thick plate plant. The blue lines are the energy efficiency values ​​of the three fan units in 29 equal time periods obtained by the above energy efficiency assessment method. It can be seen that the overall energy efficiency is mainly distributed between 45% and 50%.

[0052] Therefore, the method for online energy efficiency assessment of a heating furnace fan provided by the present invention is to estimate the energy efficiency of the entire fan group (such as the fan body, drive motor and transmission device) based on the relevant data provided by the evaluation system, which helps to guide the improvement of the energy consumption efficiency of the fan group.

[0053] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for online energy efficiency assessment of a heating furnace fan, characterized in that: The following steps are involved: Establish theoretical power consumption model of fan; Obtain real-time data on fan power consumption, fan outlet flow, and fan outlet pressure; and Calculation of the overall energy efficiency value of the fan system.

2. The method according to claim 1, characterized in that The establishment of the theoretical power consumption model of the fan specifically includes: According to the fluid pressure formula: F=Hρg, Where H is the head, m; ρ is the air density, kg / m 3 ; g is the gravitational constant; According to the above formula, substituting air density ρ and fan outlet pressure F, the head H can be calculated: The theoretical power formula of the fan is as follows: P=QHρg, Where Q is the fan outlet flow rate; The theoretical effective power consumption model of the fan in time t is as follows: W = ∫QHρgdt.

3. The method according to claim 1, characterized in that The real-time data of fan power consumption, fan outlet flow, and fan outlet pressure are obtained, including: Real-time acquisition of the meter motor input power W within time t 输入 ; Get the fan outlet flow rate as Q; The fan outlet pressure is obtained as F.

4. The method according to claim 1, characterized in that: The calculation of the overall energy efficiency value of the fan system includes: Substitute the fan outlet flow rate Q and fan outlet pressure F into the theoretical effective power consumption model to obtain the theoretical effective power consumption W, and then calculate its difference from the actual power consumption W. 输入 The ratio of is taken as the energy efficiency η to realize the online energy efficiency assessment of the heating furnace fan. The formula is as follows:

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