Load optimization control method and system for generator set of gas boiler

Abstract

The invention discloses a load optimization control method and system for a generator set of a gas boiler. According to the scheme, when the pipe network pressure of a gas pipe network exceeds a preset pressure range, a power generation load target of a gas boiler generator set is adjusted according to a preset time threshold value and a preset load adjusting amount; and according to the power generation load target, the gas flow of the main regulating gas pipe network with the pipe network pressure exceeding the preset pressure range is regulated. Therefore, the power generation load target of the gas boiler generator set is determined according to the pipe network pressure change of the gas pipe network, the gas pipe network with the pipe network pressure fluctuating is adjusted, the gas pressure fluctuation and the flow change can be quickly responded, meanwhile, the stable change of boiler combustion of the gas boiler generator set is kept, and the energy consumption is reduced. And finally, dynamic synchronous coordination control of double balance of gas pipe network pressure and boiler gas combustion power generation is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of by-product coal gas power generation, and in particular to a method and system for load optimization control of a coal gas boiler generator set. Background Art

[0002] By-product gas is a combustible gas produced during the steel production process, mainly including blast furnace gas (BFG), coke oven gas (COG) and converter gas (LDG). By installing gas boiler generator sets, these by-product gases can be used to generate electricity. This measure not only helps to save energy and reduce emissions and improve the comprehensive utilization rate of energy, but also helps to reduce the production costs of steel companies and optimize their energy conversion efficiency.

[0003] However, since steel production is not always continuous, the pressure and flow in the gas network will fluctuate. This characteristic brings challenges to the stable operation of gas boilers, including unstable combustion, coupled oscillation between gas pressure and boiler gas supply, low gas and boiler utilization, large fluctuations in power generation load, and frequent adjustments required by operators. Summary of the invention

[0004] In view of this, the embodiments of the present application are committed to providing a load optimization control method and system for a gas boiler generator set, which can quickly respond to pressure fluctuations and flow changes in the gas pipeline network, and under the premise of stable changes in boiler combustion of the gas boiler generator set, suppress pressure fluctuations in the gas pipeline network to maintain pipeline pressure stability, thereby helping to achieve dynamic synchronous coordinated control of the dual balance of gas pipeline network pressure and boiler gas combustion power generation.

[0005] According to a first aspect of an embodiment of the present application, a method for optimizing load control of a gas boiler generator set is provided, comprising:

[0006] Obtaining the network pressure of a gas network; the gas network is used to transport byproduct gas of a steel enterprise to a gas boiler generator set;

[0007] Determining whether the pipe network pressure exceeds a preset pressure range of the gas pipe network;

[0008] If the pipe network pressure exceeds the preset pressure range, adjusting the power generation load target of the gas boiler generator set according to the preset time threshold and the preset load adjustment amount;

[0009] According to the power generation load target, the gas flow of the main gas pipeline network is adjusted; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

[0010] Optionally, the number of the gas pipeline networks is at least two, each used to transport different by-product gases;

[0011] The step of adjusting the gas flow rate of the main gas pipeline network according to the power generation load target includes:

[0012] Acquire the current power generation load of the gas boiler generator set and the current gas flow of each gas pipeline network;

[0013] Calculating a power generation load deviation of a gas boiler generator set according to the current power generation load and the power generation load target;

[0014] Determining a total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow;

[0015] The main regulating gas flow target of the main regulating gas pipeline network is calculated according to the total gas flow target, the current gas flow of each gas pipeline network and the calorific value of each by-product gas.

[0016] Optionally, determining the total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow includes:

[0017] Obtaining a historical gas consumption rate of the gas boiler generator set; the historical gas consumption rate is used to indicate the byproduct gas consumed by the gas boiler generator set per unit of electricity generated;

[0018] Determining a flow adjustment range of a total gas flow of each of the gas pipeline networks according to the historical gas consumption rate and the power generation load target;

[0019] Determining a preliminary total gas flow target for each of the gas pipeline networks according to the power generation load deviation and the current gas flow;

[0020] Based on the card edge control algorithm, the total gas flow target is obtained according to the preliminary total gas flow target and the flow adjustment range.

[0021] Optionally, the obtaining of the historical gas consumption rate of the gas boiler generator set includes:

[0022] For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size;

[0023] Calculate the simple moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate;

[0024] or,

[0025] Calculate the weighted moving average or exponential moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate; wherein, the closer the historical time period is to the current moment, the greater the weight value corresponding to the short-term historical gas consumption rate in the historical time period.

[0026] Optionally, the card edge control algorithm is based on which the total gas flow target is obtained according to the preliminary total gas flow target and the flow adjustment range, including:

[0027] Determining whether the preliminary total gas flow target exceeds the flow adjustment range;

[0028] If the preliminary total gas flow target does not exceed the flow adjustment range, determining the preliminary total gas flow target as the total gas flow target;

[0029] If the preliminary total gas flow target exceeds the flow adjustment range, the boundary value in the flow adjustment range that is closest to the preliminary total gas flow target is determined as the total gas flow target.

[0030] Optionally, the determining whether the pipeline network pressure exceeds a preset pressure range of the gas pipeline network includes:

[0031] Determine whether the network pressure of each gas network exceeds the preset pressure range corresponding to the gas network;

[0032] Before calculating the main gas flow target of the main gas pipeline network, the method further includes:

[0033] The gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range is determined as the main gas pipeline network.

[0034] Optionally, adjusting the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount includes:

[0035] In the case where the pipe network pressure exceeds the preset pressure range, determining whether the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold;

[0036] If the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold, the power generation load target of the gas boiler generator set is adjusted according to the preset load adjustment amount.

[0037] According to a second aspect of an embodiment of the present application, a load optimization control system for a gas boiler generator set is provided, comprising:

[0038] An acquisition module, used to acquire the network pressure of a gas network; the gas network is used to transport byproduct gas of a steel enterprise to a gas boiler generator set;

[0039] A judgment module, used to judge whether the pipe network pressure exceeds a preset pressure range of the gas pipe network;

[0040] A load adjustment module, configured to adjust the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount if the pipe network pressure exceeds the preset pressure range;

[0041] The flow adjustment module is used to adjust the gas flow of the main gas pipeline network according to the power generation load target; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

[0042] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; and the processor is used to execute the method described in any one of the above embodiments.

[0043] According to a fourth aspect of the embodiments of the present application, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any of the above embodiments.

[0044] The embodiment of the present application provides a method and system for optimizing the load control of a gas boiler generator set. When the network pressure of the gas network exceeds the preset pressure range, the power generation load target of the gas boiler generator set is adjusted according to the preset time threshold and the preset load adjustment amount; and then the gas flow of the gas network whose network pressure exceeds the preset pressure range is adjusted according to the power generation load target. Thus, the power generation load target of the gas boiler generator set is determined according to the change of the network pressure of the gas network to adjust the gas network where the network pressure fluctuates, which can quickly respond to the fluctuation of the gas pressure and the change of the flow, and help to suppress the fluctuation of the gas network pressure and maintain the stability of the network pressure. On the other hand, the gradual change of the gas flow rate is ensured by the preset time threshold and the preset load adjustment amount, so that the boiler combustion of the gas boiler generator set changes smoothly, and finally the dynamic synchronous coordinated control of the dual balance of the gas network pressure and the boiler gas combustion power generation is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Shown is a flow chart of a method for optimizing load control of a gas boiler generator set provided in one embodiment of the present application.

[0046] Figure 2 Shown is a flow chart of a method for optimizing load control of a gas boiler generator set provided in another embodiment of the present application.

[0047] Figure 3 Shown is a block diagram of a load optimization control system for a gas boiler generator set provided in one embodiment of the present application.

[0048] Figure 4 Shown is a structural block diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Application Overview

[0051] Steel enterprises produce a lot of by-product gas in the main steel production process, mainly including blast furnace gas

[0052] Blast Furnace Gas, BFG), Coke Oven Gas (COG) and Converter Gas

[0053] (Ladle Furnace Gas, referred to as LDG). Among them, blast furnace gas has a large output but a low calorific value (about 3500kJ / m3) and large fluctuations, coke oven gas has the highest calorific value (about 18000kJ / m3) and small fluctuations, and converter calorific value is in the middle (about 6500kJ / m3) and large fluctuations.

[0054] These by-product gases can be transported to other sections through the gas pipeline network for use, and the remaining part can be transported to the gas boiler generator set as fuel for power generation. Due to the non-continuous characteristics of the steel production process, the pressure and flow of the by-product gas also fluctuate, and the pressure fluctuation range can even reach 20Kpa. This leads to a series of problems such as unstable combustion process of the by-product gas in the boiler of the gas boiler generator set, coupled oscillation of the gas pipeline pressure and boiler gas, large fluctuations in power generation load, and frequent operations by operators, which makes it impossible to achieve the optimal efficiency of the gas boiler unit and has a great impact on the stability of production operation.

[0055] It can be seen that the gas boiler generator set must not only consider the stability of its own boiler combustion to ensure the safe operation of the unit, but also combine the fluctuations of external gas generation and other production and use. At present, the control methods of gas boiler generator sets are mainly the following:

[0056] 1) Manual control mode: The flow control valve of by-product gas and the steam turbine control valve are all controlled manually by DCS. Because the gas used in the boiler has a certain degree of uncertainty, the operator needs to make continuous adjustments when the gas pressure and flow fluctuate. It is necessary to ensure the stability of boiler combustion and consider the pressure of the gas network, the matching of power generation load and other working conditions. The stable operation of the entire unit is highly dependent on the operator's experience and operation frequency, and the degree of cooperation of multiple operators will also have a great impact on the operation of the system.

[0057] 2) Coordinated control of boiler pressure regulator and power regulating unit: that is, the control method of conventional coal-fired units is adopted. The boiler stabilizes the main steam pressure by adjusting the opening of the gas valve, and the steam turbine DEH adjusts the power generation load. Compared with manual control, this control method takes into account the coordinated control between the boiler and the steam turbine. In the case of a matching gas storage cabinet or stable gas pressure, it can achieve stable boiler combustion and rapid adjustment of the unit power generation load to a certain extent, but it cannot meet long-term stable operation. The key point is that the fuel supply of coal-fired units is sufficient, mainly aimed at stabilizing the power generation load, while the fuel supply of gas boiler generators is uncertain, and the power generation load can only be determined by the amount of gas. There are three types of gas (blast furnace, coke oven and converter), the calorific value of the three types of gas is different, and each type of gas has uncertain fluctuations, and the boiler combustion cannot stably provide sufficient fuel. In pursuit of stable power generation load, the pressure of the gas pipeline network is not considered. The production fluctuation of the gas pipeline network is coupled with the oscillation of boiler gas consumption, and the boiler cannot burn stably. Especially when the gas pipeline network supplies gas to multiple boilers or other users such as blast furnaces, hot blast furnaces, steel rolling mills, etc., the coordinated control method of the furnace pressure regulator and power regulating unit does not take into account the stability of the pipeline network pressure, and the degree of matching for the intermittent production process of this steel plant is insufficient.

[0058] 3) Gas flow control: Gas flow control is to quantitatively control the flow of each gas through a flow regulating valve. Conventional control is to adjust one of the gases according to production needs, and the other two gases can only be passively adjusted accordingly or passively adjusted after the boiler combustion conditions change. The coordinated control between the three gases is not considered. The boiler combustion conditions fluctuate greatly, and the operation of the operators is complicated. In addition, each adjustment of a certain gas flow requires multiple adjustments to the other two gas flows to stabilize the boiler combustion, and it cannot be completed quantitatively at one time.

[0059] In order to solve the above problems, a method for optimizing the load control of a gas boiler generator set is proposed in the embodiment of the present application. The method includes: when the network pressure of the gas network exceeds the preset pressure range, the power generation load target of the gas boiler generator set is adjusted according to the preset time threshold and the preset load adjustment amount; and then the gas flow of the gas network is adjusted according to the power generation load target. Thus, the load target is automatically adjusted according to the gas pressure fluctuation, the network pressure is maintained stable, and the boiler combustion is synchronously and coordinatedly controlled to change smoothly, so as to achieve dynamic synchronous coordinated control of the dual balance of the gas network pressure and the boiler gas combustion power generation.

[0060] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0061] Exemplary Methods

[0062] Figure 1 It is a flow chart of a method for optimizing load control of a gas boiler generator set provided in one embodiment of the present application. Figure 1 The method described is executed by a computing device (eg, a PC, a server), but the embodiments of the present application are not limited thereto.

[0063] like Figure 1 As shown, the method includes the following contents:

[0064] Step S110: obtaining the network pressure of the gas network; the gas network is used to transport the by-product gas of the steel enterprise to the gas boiler generator set;

[0065] In an embodiment of the present application, the by-product gas is a combustible gas generated by a steel enterprise during the production process, and the by-product gas includes at least one of blast furnace gas, coke oven gas and converter gas; correspondingly, the gas pipeline network includes at least one of a blast furnace gas pipeline network, a coke oven gas pipeline network and a converter gas pipeline network; the pipeline network pressure includes at least one of the pipeline pressure of the blast furnace gas pipeline network, the pipeline pressure of the coke oven gas pipeline network and the pipeline pressure of the converter gas pipeline network.

[0066] In the embodiment of the present application, the gas boiler generator set uses byproduct gas as fuel to generate electricity, and may include a boiler, a steam turbine and a generator. The gas boiler generator set may include one or more gas boiler generators.

[0067] Step S120: determining whether the pipe network pressure exceeds a preset pressure range of the gas pipe network;

[0068] In the embodiment of the present application, the preset pressure ranges of different gas pipeline networks can be set separately. The preset pressure ranges can be determined according to the production and usage conditions of each gas pipeline network, and can be adjusted at any time according to the actual situation. The preset pressure ranges can include an upper limit and a lower limit of the gas pipeline network pressure.

[0069] Step S130: if the pipe network pressure exceeds the preset pressure range, adjusting the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount;

[0070] In the embodiment of the present application, the power generation load target is used to represent the output power level that the gas boiler generator set needs to achieve.

[0071] In the embodiment of the present application, the preset time threshold is used to limit the time interval between two adjacent adjustments of the power generation load target.

[0072] In the embodiment of the present application, the preset load adjustment amount can be used as the step size and adjustment amplitude when adjusting the power generation load target.

[0073] If the pipeline pressure is less than the lower limit of the gas pipeline pressure, the power generation load target of the gas boiler generator set is lowered according to the preset time threshold and the preset load adjustment amount, that is, the difference between the current power generation load of the gas boiler generator set and the preset load adjustment amount is calculated to obtain the power generation load target.

[0074] If the pipeline pressure is greater than the upper limit of the gas pipeline pressure, the power generation load target of the gas boiler generator set is adjusted upward according to the preset time threshold and the preset load adjustment amount, that is, the sum of the current power generation load of the gas boiler generator set and the preset load adjustment amount is calculated to obtain the power generation load target.

[0075] If the pipe network pressure is between the upper limit and the lower limit of the gas pipe network pressure, the power generation load target of the gas boiler generator set is not adjusted.

[0076] Step S140: adjusting the gas flow of the main gas pipeline network according to the power generation load target; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

[0077] In the embodiment of the present application, the network pressure of the main gas pipeline network exceeds its corresponding preset pressure range, that is, the main gas pipeline network is the gas pipeline network to be adjusted.

[0078] In the prior art, the mainstream control method for gas boiler generator sets is: adjust the turbine intake valve after changing the load target on the turbine side, and adjust the boiler gas flow control valve after the main steam pressure fluctuates passively. Multi-stage transmission and passive changes make the reaction speed unable to match the gas pressure and flow fluctuations, which may cause huge pressure fluctuations in the gas network.

[0079] In the embodiment of the present application, when the network pressure of the gas network exceeds the preset pressure range, the power generation load target of the gas boiler generator set is adjusted according to the preset time threshold and the preset load adjustment amount; and then the gas flow of the gas network whose network pressure exceeds the preset pressure range is adjusted according to the power generation load target. Thus, the power generation load target of the gas boiler generator set is determined according to the change of the network pressure of the gas network to adjust the gas network where the network pressure fluctuates, which can quickly respond to the fluctuation of the gas pressure and the change of the flow, and help to suppress the fluctuation of the gas network pressure and maintain the stability of the network pressure. On the other hand, the gradual change of the gas flow rate is ensured by the preset time threshold and the preset load adjustment amount, so that the boiler combustion of the gas boiler generator set changes smoothly, and finally the dynamic synchronous coordinated control of the dual balance of the gas network pressure and the boiler gas combustion power generation is achieved.

[0080] based on Figure 1 The method in this specification also provides some specific implementation plans of the method, which are described below.

[0081] Optionally, the number of the gas pipeline networks is at least two, each used to transport different by-product gases;

[0082] The step of adjusting the gas flow rate of the main gas pipeline network according to the power generation load target includes:

[0083] Acquire the current power generation load of the gas boiler generator set and the current gas flow of each gas pipeline network;

[0084] Calculating a power generation load deviation of a gas boiler generator set according to the current power generation load and the power generation load target;

[0085] Determining a total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow;

[0086] The main regulating gas flow target of the main regulating gas pipeline network is calculated according to the total gas flow target, the current gas flow of each gas pipeline network and the calorific value of each by-product gas.

[0087] In the embodiment of the present application, the current power generation load is used to represent the power generation output by the gas boiler generator set at the current moment; the power generation load deviation is the difference between the current power generation load of the gas boiler generator set and the power generation load target.

[0088] In the embodiment of the present application, the total gas flow target is used to represent the total fuel required by the gas boiler generator set. The total gas flow target can be converted into the flow of any by-product gas, which is numerically equal to the flow of the fuel when only one fuel (such as blast furnace gas, coke oven gas, converter gas, standard coal, natural gas, etc.) is used for power generation. Generally speaking, the total gas flow target can be expressed as the gas flow of the corresponding main gas when only the main gas (by-product gas transported by the main gas pipeline) is used for power generation.

[0089] In the embodiment of the present application, the calculation of the main gas flow target of the main gas pipeline network according to the total gas flow target, the current gas flow of each gas pipeline network and the calorific value of each by-product gas may include:

[0090] According to the calorific value of each of the by-product coal gases, the calorific value of the current gas flow of the auxiliary gas is converted to obtain the current converted flow of the auxiliary gas; the auxiliary gas is other types of by-product coal gas except the main gas;

[0091] The difference between the total gas flow target and the current converted flow of the auxiliary gas is calculated to obtain the main gas flow target of the main gas pipeline network.

[0092] In actual applications, in order to simplify the calculation process, it is generally converted to the main gas. At this time, the calculation formula for the main gas flow target is:

[0093] FT1 sp=FTsp―FT2xK2+FT3xK3

[0094] In the formula, FT1sp is the main gas flow target of the main gas network; FTsp is the total gas flow target converted to the main gas; FT2 and FT3 are the current gas flow of the auxiliary gas; K2 and K3 are the conversion coefficients of the auxiliary gas. The conversion coefficient of the auxiliary gas is the ratio of the calorific value of the auxiliary gas to the main gas. FT2xK2 and FT3xK3 are the current converted flow of the auxiliary gas.

[0095] In the embodiment of the present application, the power generation load deviation of the gas boiler generator set is calculated according to the current power generation load of the gas boiler generator set and the power generation load target; then the total gas flow target is determined according to the power generation load deviation and the current gas flow, and the main gas flow target of the main gas network is obtained by calculating the total gas flow target and the current converted flow of the auxiliary gas. Thus, the gas flow of the main gas network is accurately adjusted according to the power generation load deviation, which helps to suppress the pressure fluctuation of the gas network and ensure the smooth change of the boiler combustion of the gas boiler generator set.

[0096] Optionally, determining the total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow includes:

[0097] Obtaining a historical gas consumption rate of the gas boiler generator set; the historical gas consumption rate is used to indicate the byproduct gas consumed by the gas boiler generator set per unit of electricity generated;

[0098] Determining a flow adjustment range of a total gas flow of each of the gas pipeline networks according to the historical gas consumption rate and the power generation load target;

[0099] Determining a preliminary total gas flow target for each of the gas pipeline networks according to the power generation load deviation and the current gas flow;

[0100] Based on the card edge control algorithm, the total gas flow target is obtained according to the preliminary total gas flow target and the flow adjustment range.

[0101] In the embodiment of the present application, the preliminary total gas flow target is obtained according to the power generation load deviation and the current gas flow. Specifically, the preliminary total gas flow target is determined based on the PID algorithm according to the power generation load deviation and the current gas flow.

[0102] In an embodiment of the present application, the historical gas consumption rate is used to indicate the by-product gas consumed by the gas boiler generator set for each unit of electricity generated; the power generation load target is used to indicate the output power target of the gas boiler generator set. The product of the two is the center value of the flow adjustment range; the flow adjustment range can be calculated based on the center value and the preset fluctuation range. The preset fluctuation range may mean that the flow adjustment range has a preset interval length, or the preset fluctuation range is the product of the center value and the preset ratio. That is, the flow adjustment range can be expressed as a±b or a(1±c%), where a is the center value, that is, the product of the historical gas consumption rate and the power generation load target; b and c% can both be used to represent the preset fluctuation range.

[0103] In the embodiment of the present application, the card edge control algorithm is used to determine the flow adjustment range according to the historical gas consumption rate of the gas boiler generator set to ensure that the initial total gas flow target does not exceed the flow adjustment range.

[0104] Figure 2 FIG. 2 is a flow chart of a method for optimizing load control of a gas boiler generator set provided by another embodiment of the present application. Figure 2As shown, the total gas flow of each gas pipeline network is generally adjusted by a PID control algorithm, but the PID control algorithm may cause the total gas flow to be adjusted too slowly or excessively. In addition, the current gas flow of each gas pipeline network may also be affected by multiple factors such as the efficiency of the gas boiler generator set and the calorific value of the byproduct gas.

[0105] In the embodiment of the present application, the flow adjustment range of the total gas flow is determined according to the historical gas consumption rate of the gas boiler generator set and the power generation load target; the preliminary total gas flow target of each gas network is determined according to the power generation load deviation and the current gas flow; the total gas flow target is obtained based on the card edge control algorithm according to the preliminary total gas flow target and the flow adjustment range. On the one hand, after the power generation load target is adjusted, the total gas flow target is quickly and accurately adjusted to the flow adjustment range, which greatly reduces the delay caused by boiler combustion lag, long PID controller reaction cycle, etc., and helps to quickly respond to gas pressure fluctuations and suppress gas network pressure fluctuations; on the other hand, preventing the total gas flow target from deviating from a reasonable range helps to avoid over-adjustment of the total gas flow.

[0106] Optionally, the obtaining of the historical gas consumption rate of the gas boiler generator set includes:

[0107] For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size;

[0108] The historical gas consumption rate is obtained by counting the short-term historical gas consumption rates in each historical time period.

[0109] In the embodiment of the present application, the moving time window may be a time period with a preset window size and a current time as the end point. The preset window size may be flexibly set according to actual needs, for example, several hours or one day.

[0110] In an embodiment of the present application, the lengths of each historical time period within the moving time window may remain consistent.

[0111] In the embodiment of the present application, the statistical analysis of the short-term historical gas consumption rate in each historical time period may include: calculating the average value, median value or mode of the short-term historical gas consumption rate in each historical time period.

[0112] In the embodiment of the present application, the average value refers to the moving average of the short-term historical gas consumption rate within the moving time window; the moving average (Moving Average, MA) is also called the sliding average, the rolling average, and can be further subdivided into the simple moving average (Simple Moving Average, SMA), the weighted moving average (Weighted Moving Average, WMA) and the exponential moving average (Exponent ia l Moving Average, EMA).

[0113] In the embodiment of the present application, by counting the short-term historical gas consumption rate of each historical time period in the recent period, a historical gas consumption rate that is closer to the actual operating status of the gas boiler generator set can be obtained. This improves the accuracy and reliability of the flow adjustment range and helps to accurately determine the total gas flow target.

[0114] Optionally, the obtaining of the historical gas consumption rate of the gas boiler generator set includes:

[0115] For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size;

[0116] The simple moving average of the short-term historical gas consumption rate in each historical time period is calculated to obtain the historical gas consumption rate.

[0117] In the embodiment of the present application, the simple moving average is the average value of the short-term historical gas consumption rate in each historical time period.

[0118] In the embodiment of the present application, by calculating the moving average of the short-term historical gas consumption rate in each historical time period in the recent period, a historical gas consumption rate that is closer to the actual operating status of the gas boiler generator set can be obtained. This improves the accuracy and reliability of the flow adjustment range and helps to accurately determine the total gas flow target.

[0119] Optionally, the obtaining of the historical gas consumption rate of the gas boiler generator set includes:

[0120] For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size;

[0121] Calculate the weighted moving average or exponential moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate; wherein, the closer the historical time period is to the current moment, the greater the weight value corresponding to the short-term historical gas consumption rate in the historical time period.

[0122] In the embodiment of the present application, when calculating the weighted moving average or the exponential moving average, the closer the historical time period is to the current moment, the greater the weight value corresponding to the short-term historical gas consumption rate in the historical time period. That is, the closer the short-term historical gas consumption rate is to the current moment, the greater the impact.

[0123] In the embodiment of the present application, the weighted moving average may include a linear weighted moving average (LWMA), that is, the weight value corresponding to the short-term historical gas consumption rate within the historical time period changes linearly.

[0124] In the embodiment of the present application, the exponential moving average can be regarded as a special weighted moving average, that is, the exponential change of the weight value corresponding to the short-term historical gas consumption rate within the historical time period.

[0125] In the embodiment of the present application, the weighted moving average or exponential moving average of the short-term historical gas consumption rate in each historical time period is calculated to obtain the historical gas consumption rate. Compared with the weighted moving average, a higher weight value is assigned to the recent short-term historical gas consumption rate, so that the historical gas consumption rate not only considers the data of each historical time period in the moving time window, but also better reflects the changing trend of the gas consumption rate. Thus, a historical gas consumption rate that is closer to the actual operating conditions of the gas boiler generator set is obtained. This improves the accuracy and reliability of the flow adjustment range, which helps to accurately determine the total gas flow target.

[0126] Optionally, the card edge control algorithm is based on which the total gas flow target is obtained according to the preliminary total gas flow target and the flow adjustment range, including:

[0127] Determining whether the preliminary total gas flow target exceeds the flow adjustment range;

[0128] If the preliminary total gas flow target does not exceed the flow adjustment range, determining the preliminary total gas flow target as the total gas flow target;

[0129] If the preliminary total gas flow target exceeds the flow adjustment range, the boundary value in the flow adjustment range that is closest to the preliminary total gas flow target is determined as the total gas flow target.

[0130] In the embodiment of the present application, the flow adjustment range may include an upper limit value and a lower limit value. If the preliminary total gas flow target is lower than the lower limit value of the flow adjustment range, the boundary value closest to the preliminary total gas flow target is the lower limit value, and the lower limit value is determined as the total gas flow target. If the preliminary total gas flow target is higher than the upper limit value of the flow adjustment range, the boundary value closest to the preliminary total gas flow target is the upper limit value, and the upper limit value is determined as the total gas flow target.

[0131] In an embodiment of the present application, when the preliminary total gas flow target exceeds a reasonable range, by adjusting it to the closest boundary value, the total gas flow target can be effectively prevented from exceeding a reasonable adjustment range, while avoiding excessive or slow adjustment of the total gas flow target.

[0132] Optionally, the determining whether the pipeline network pressure exceeds a preset pressure range of the gas pipeline network includes:

[0133] Determine whether the network pressure of each gas network exceeds the preset pressure range corresponding to the gas network;

[0134] Before calculating the main gas flow target of the main gas pipeline network, the method further includes:

[0135] The gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range is determined as the main gas pipeline network.

[0136] In actual applications, by-product gas includes blast furnace gas, coke oven gas and converter gas. When the by-product gas is sent to the boiler for combustion, blast furnace gas is generally used as the main gas, with coke oven gas and converter gas mixed in. Blast furnace gas is generally selected as the main gas for regulating, and the stable operation of the gas boiler generator set is mainly maintained by regulating blast furnace gas.

[0137] In the embodiment of the present application, the main regulating gas pipeline network can be regarded as a gas pipeline network whose pipeline pressure is to be adjusted.

[0138] In the embodiment of the present application, if the network pressure of a gas network exceeds its corresponding preset pressure range, it will be used as the main gas network. Then, the total gas flow target of each gas network is determined according to the current power generation load and the power generation load target; the main gas flow target of the main gas network is calculated according to the total gas flow target and the current gas flow of the auxiliary gas. Therefore, after any gas network has pressure fluctuations, it can be used as the main gas for adjustment, thereby realizing flexible control of the three gases and maintaining the stability of boiler combustion.

[0139] Optionally, adjusting the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount includes:

[0140] In the case where the pipe network pressure exceeds the preset pressure range, determining whether the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold;

[0141] If the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold, the power generation load target of the gas boiler generator set is adjusted according to the preset load adjustment amount.

[0142] In the embodiment of the present application, the preset time threshold and the preset load adjustment amount are determined according to the actual situation of the gas boiler generator set.

[0143] The preset time threshold is used to limit the time between two adjacent adjustments of the power generation load target, to avoid multiple adjustments of the power generation load target in a short period of time, and to provide a reaction time for the adjustment of the boiler, steam turbine, generator and other equipment of the generator. The preset load adjustment amount is used to limit the amplitude of each adjustment of the power generation load target, to avoid excessive adjustment of the power generation load target, which will cause the combustion of the by-product gas in the boiler, the main steam pressure of the steam turbine, etc. to exceed the stable operation range.

[0144] In actual applications, if the power generation load target of the gas boiler generator set and the gas flow rate of each gas pipeline network are adjusted too quickly, it will affect the combustion stability of the byproduct gas in the boiler. In addition, after the power generation load target and the gas flow rate of each gas pipeline network are adjusted, the adjustment of the boiler, steam turbine, generator and other equipment in the gas boiler generator set has a certain lag.

[0145] In the embodiment of the present application, if the network pressure exceeds the preset pressure range, and the time interval between the last time the power generation load target was adjusted and the current time reaches the preset time threshold, the power generation load target of the gas boiler generator set is adjusted according to the preset load adjustment amount, and then the gas flow of the gas network with the network pressure exceeding the range is adjusted. Thus, after the network pressure exceeds the preset pressure range, the gas flow of the gas boiler generator set is quickly adjusted, while taking into account the stable operation of the gas boiler generator set, and achieving dynamic synchronous coordinated control of the dual balance of the gas network pressure and boiler gas combustion power generation.

[0146] Exemplary Systems

[0147] The system embodiment of the present application can be used to execute the method embodiment of the present application. For details not disclosed in the system embodiment of the present application, please refer to the method embodiment of the present application.

[0148] Figure 3FIG. 1 is a block diagram of a load optimization control system for a gas boiler generator set provided by an embodiment of the present application. Figure 3 As shown, the system 300 includes:

[0149] The acquisition module 310 is used to obtain the network pressure of the gas network; the gas network is used to transport the by-product gas of the steel enterprise to the gas boiler generator set;

[0150] A judgment module 320 is used to judge whether the pipe network pressure exceeds a preset pressure range of the gas pipe network;

[0151] A load adjustment module 330, configured to adjust the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount if the pipe network pressure exceeds the preset pressure range;

[0152] The flow adjustment module 340 is used to adjust the gas flow of the main gas pipeline network according to the power generation load target; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

[0153] Optionally, the number of the gas pipeline networks is at least two, each used to transport different by-product gases;

[0154] The flow adjustment module 340 includes:

[0155] An acquisition unit, used for acquiring the current power generation load of the gas boiler generator set and the current gas flow of each gas pipeline network;

[0156] a deviation calculation unit, configured to calculate a power generation load deviation of a gas boiler generator set according to the current power generation load and the power generation load target;

[0157] A total flow calculation unit, used for determining a total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow;

[0158] The main regulating flow calculation unit is used to calculate the main regulating gas flow target of the main regulating gas pipeline network according to the total gas flow target, the current gas flow of each gas pipeline network and the calorific value of each by-product gas.

[0159] Optionally, the total flow calculation unit includes:

[0160] The consumption rate acquisition subunit is used to acquire the historical gas consumption rate of the gas boiler generator set; the historical gas consumption rate is used to represent the by-product gas consumed by the gas boiler generator set per unit of electricity generated;

[0161] A flow range subunit, used to determine the flow adjustment range of the total gas flow of each of the gas pipeline networks according to the historical gas consumption rate and the power generation load target;

[0162] A total flow calculation subunit, used for determining a preliminary total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow;

[0163] The card edge control subunit is used to obtain the total gas flow target based on the card edge control algorithm according to the preliminary total gas flow target and the flow adjustment range.

[0164] Optionally, the consumption rate acquisition subunit is used to:

[0165] For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size;

[0166] Calculate the simple moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate;

[0167] or,

[0168] Calculate the weighted moving average or exponential moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate; wherein, the closer the historical time period is to the current moment, the greater the weight value corresponding to the short-term historical gas consumption rate in the historical time period.

[0169] Optionally, the card edge control subunit is used to:

[0170] Determining whether the preliminary total gas flow target exceeds the flow adjustment range;

[0171] If the preliminary total gas flow target does not exceed the flow adjustment range, determining the preliminary total gas flow target as the total gas flow target;

[0172] If the preliminary total gas flow target exceeds the flow adjustment range, the boundary value in the flow adjustment range that is closest to the preliminary total gas flow target is determined as the total gas flow target.

[0173] Optionally, the judgment module 320 is used to judge whether the network pressure of each gas network exceeds a preset pressure range corresponding to the gas network;

[0174] The flow adjustment module 340 further includes:

[0175] The main gas regulating unit is used to determine the gas pipeline network whose pipeline pressure exceeds the corresponding preset pressure range as the main gas pipeline network.

[0176] Optionally, the load adjustment module 330 is used to:

[0177] In the case where the pipe network pressure exceeds the preset pressure range, determining whether the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold;

[0178] If the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold, the power generation load target of the gas boiler generator set is adjusted according to the preset load adjustment amount.

[0179] Exemplary Electronic Devices

[0180] Below, reference Figure 4 To describe an electronic device according to an embodiment of the present application. Figure 4 A block diagram of an electronic device according to an embodiment of the present application is illustrated.

[0181] like Figure 4 As shown, electronic device 400 includes one or more processors 410 and memory 420 .

[0182] The processor 410 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.

[0183] The memory 420 may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 410 may run the program instructions to implement the gas boiler generator load optimization control method of each embodiment of the present application described above and / or other desired functions. Various contents such as category correspondences may also be stored in the computer-readable storage medium.

[0184] In one example, the electronic device 400 may further include: an input device 430 and an output device 440 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0185] In addition, the input device 430 may also include, for example, a keyboard, a mouse, etc. The output device 440 may output various information to the outside. The output device 440 may include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, etc.

[0186] Of course, to simplify, Figure 4 Only some of the components related to the present application in the electronic device 400 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application conditions, the electronic device 400 may also include any other appropriate components.

[0187] Exemplary computer program products and computer-readable storage media

[0188] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the gas boiler generator set load optimization control method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0189] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0190] In addition, an embodiment of the present application may also be a computer-readable storage medium on which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor executes the steps of the control method of a gas boiler generator set according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0191] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0192] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0193] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0194] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0195] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0196] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0197] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for optimizing load control of a gas boiler generator set, characterized in that: include: Obtain the network pressure of the gas network; The gas pipeline network is used to transport by-product gas of the steel enterprise to the gas boiler generator set; Determining whether the pipe network pressure exceeds a preset pressure range of the gas pipe network; If the pipe network pressure exceeds the preset pressure range, adjusting the power generation load target of the gas boiler generator set according to the preset time threshold and the preset load adjustment amount; According to the power generation load target, the gas flow of the main gas pipeline network is adjusted; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

2. The method according to claim 1, characterized in that The number of the gas pipeline networks is at least two, each used to transport different by-product gases; The step of adjusting the gas flow rate of the main gas pipeline network according to the power generation load target includes: Acquire the current power generation load of the gas boiler generator set and the current gas flow of each gas pipeline network; Calculating a power generation load deviation of a gas boiler generator set according to the current power generation load and the power generation load target; Determining a total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow; The main regulating gas flow target of the main regulating gas pipeline network is calculated according to the total gas flow target, the current gas flow of each gas pipeline network and the calorific value of each by-product gas.

3. The method according to claim 2, characterized in that Determining the total gas flow target of each gas pipeline network according to the power generation load deviation and the current gas flow includes: Obtaining a historical gas consumption rate of the gas boiler generator set; the historical gas consumption rate is used to indicate the byproduct gas consumed by the gas boiler generator set per unit of electricity generated; Determining a flow adjustment range of a total gas flow of each of the gas pipeline networks according to the historical gas consumption rate and the power generation load target; Determining a preliminary total gas flow target for each of the gas pipeline networks according to the power generation load deviation and the current gas flow; Based on the card edge control algorithm, the total gas flow target is obtained according to the preliminary total gas flow target and the flow adjustment range.

4. The method according to claim 3, characterized in that The obtaining of the historical gas consumption rate of the gas boiler generator set includes: For each historical time period in the moving time window, the short-term historical gas consumption rate in each historical time period is calculated based on the historical power generation load of the gas boiler generator set and the historical gas flow of each gas pipeline network; the moving time window ends at the current time and has a preset window size; Calculate the simple moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate; or, Calculate the weighted moving average or exponential moving average of the short-term historical gas consumption rate in each historical time period to obtain the historical gas consumption rate; wherein, the closer the historical time period is to the current moment, the greater the weight value corresponding to the short-term historical gas consumption rate in the historical time period.

5. The method according to claim 3, characterized in that: The card edge control algorithm is based on the preliminary gas total flow target and the flow adjustment range to obtain the gas total flow target, including: Determining whether the preliminary total gas flow target exceeds the flow adjustment range; If the preliminary total gas flow target does not exceed the flow adjustment range, determining the preliminary total gas flow target as the total gas flow target; If the preliminary total gas flow target exceeds the flow adjustment range, the boundary value in the flow adjustment range that is closest to the preliminary total gas flow target is determined as the total gas flow target.

6. The method according to claim 2, characterized in that The determining whether the pipeline network pressure exceeds a preset pressure range of the gas pipeline network includes: Determine whether the network pressure of each gas network exceeds the preset pressure range corresponding to the gas network; Before calculating the main gas flow target of the main gas pipeline network, the method further includes: The gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range is determined as the main gas pipeline network.

7. The method according to claim 1, characterized in that The step of adjusting the power generation load target of the gas boiler generator set according to the preset time threshold and the preset load adjustment amount includes: In the case where the pipe network pressure exceeds the preset pressure range, determining whether the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold; If the time interval between the time when the power generation load target was last adjusted and the current time reaches the preset time threshold, the power generation load target of the gas boiler generator set is adjusted according to the preset load adjustment amount.

8. A load optimization control system for a gas boiler generator set, characterized in that: include: An acquisition module, used for acquiring the network pressure of the gas network; The gas pipeline network is used to transport by-product gas of the steel enterprise to the gas boiler generator set; A judgment module, used to judge whether the pipe network pressure exceeds a preset pressure range of the gas pipe network; A load adjustment module, configured to adjust the power generation load target of the gas boiler generator set according to a preset time threshold and a preset load adjustment amount if the pipe network pressure exceeds the preset pressure range; The flow adjustment module is used to adjust the gas flow of the main gas pipeline network according to the power generation load target; the main gas pipeline network is a gas pipeline network whose pipeline pressure exceeds its corresponding preset pressure range.

9. An electronic device, comprising: processor; a memory for storing instructions executable by the processor; The processor is used to execute the method according to any one of claims 1 to 7. 10 . A computer-readable storage medium having computer program instructions stored thereon, wherein when the computer program instructions are executed by a processor, the processor is enabled to perform the method according to claim 1 .

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