CN110985887A - Energy-saving method and system for reducing energy consumption of oxygen pipe network transmission and distribution system - Google Patents
Energy-saving method and system for reducing energy consumption of oxygen pipe network transmission and distribution system Download PDFInfo
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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Abstract
The invention provides an energy-saving method and an energy-saving system for reducing energy consumption of an oxygen pipe network transmission and distribution system, which can achieve the energy-saving purposes of reducing oxygen generation energy consumption by reducing oxygen dispersion amount and reducing compression energy consumption of an oxygen compressor. The method comprises the following steps: s101, establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system; s102, adjusting control parameters to carry out diffusion simulation through an established active diffusion energy-saving model according to the oxygen demand of a user side to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process; s103, if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, executing S104; and S104, calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value. The invention relates to the technical field of energy conservation.
Description
Technical Field
The invention relates to the technical field of energy conservation, in particular to an energy-saving method and an energy-saving system for reducing energy consumption of an oxygen pipe network transmission and distribution system.
Background
In recent years, with the increasing severity of energy crisis worldwide, governments of various countries actively promote energy-saving and consumption-reducing technologies for economic sustainable development, and the problem of energy shortage also becomes an important factor restricting economic development of China.
The steel industry belongs to the process industry, and is a high-energy-consumption industry, and an air separation system provides high-purity oxygen, nitrogen, argon and other gases for the working procedures of a blast furnace, a converter and the like. The air separation system of a gas company is an air supply system, and the gas of each process is conveyed to each gas user through a conveying pipe network. The consumption of gas users changes along with the change of working procedure production working conditions, in order to ensure the normal operation of production, a gas company generally carries out overproduction, and the fluctuation of the consumption of the gas users is adapted by a method for improving the pressure of a conveying pipe network, so that the compression energy consumption is increased. In order to ensure the safety of a conveying pipe network, the oxygen pipe network conveying and distributing system is provided with a safety relief valve, once the pressure of the pipe network exceeds the standard, the relief valve is opened, and the passive relief mode wastes not only the energy consumed by compression of an oxygen compressor, but also the electric energy consumed by oxygen preparation, and has larger energy-saving space. The research and development of a novel energy-saving technology of an oxygen delivery pipe network system are important directions for realizing energy conservation of the oxygen delivery pipe network system.
Disclosure of Invention
The invention aims to solve the technical problem of providing an energy-saving method and system for reducing the energy consumption of an oxygen pipe network transmission and distribution system, and aims to solve the problem of high compression energy consumption and oxygen generation energy consumption of an oxygen compressor caused by a passive diffusion mode in the prior art.
In order to solve the above technical problems, an embodiment of the present invention provides an energy saving method for reducing energy consumption of an oxygen pipe network transmission and distribution system, including:
s101, establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system;
s102, adjusting control parameters to carry out diffusion simulation through an established active diffusion energy-saving model according to the oxygen demand of a user side to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
s103, if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, executing S104;
and S104, calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value.
Further, adjusting control parameters to perform diffusion simulation according to the oxygen demand of the user side through an established active diffusion energy-saving model, and obtaining the time variation of the outlet pressure of the oxygen compressor and the inlet pressure of the diffusion valve of the medium-pressure pipeline in the oxygen pipe network transmission and distribution system in the operation process comprises the following steps:
s1021, adjusting the opening k and the opening adjusting time t of the inlet guide vane of the oxygen compressor through the established active diffusion energy-saving model according to the oxygen demand of the user side1And opening degree adjustment time length delta t1Obtaining the time change of the outlet pressure Pa of the oxygen compressor and the inlet pressure Pb of the medium-pressure pipeline relief valve in the operation process;
s1022, judging whether a result obtained by the diffusion simulation meets the operation constraint condition of the transmission and distribution system, if not, opening a medium-pressure pipeline diffusion valve, and returning to S1021 for mixed diffusion simulation; otherwise, S103 is executed.
Further, the determining whether the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system includes:
judging whether the maximum pressure Pa of the outlet of the oxygen compressor, the maximum pressure Pb of a bleed valve of the medium-pressure pipeline and the regulating range delta k of the opening degree of the inlet guide vane of the oxygen compressor meet the following conditions: pa is less than or equal to the first threshold, Pb is less than or equal to the second threshold, and delta k is less than or equal to the third threshold.
Further, the opening time of the medium-pressure pipeline bleeding valve is the time when Pb is larger than a second threshold value for the first time, and the opening time delta t of the medium-pressure pipeline bleeding valve2Gradually increasing from the shortest time period.
Further, the energy consumption savings include: the change of the compression energy consumption of the oxygen compressor caused by the change of the oxygen flow of the oxygen compressor and the oxygen generation energy consumption saved by the reduced oxygen dispersion amount.
Further, the change of the compression energy consumption of the oxygen compressor caused by the change of the oxygen flow of the oxygen compressor is represented as:
ΔW＝W1-W2
W1、W2the calculation formula of (2) is as follows:
Ni＝-7.1931*10-6*Qn 2-0.96632*k2+0.0047768Qn*k+0.63358*Qn-159.56*k-4902.9
wherein Δ W represents Δ t1The compression energy consumption of the oxygen compressor is reduced in time, W represents the total energy consumption of the oxygen compressor, W1Represents Δ t1Total energy consumption of overpressure relieving oxygen compressor in time, W2Represents Δ t1Total energy consumption of simulated diffusion oxygen compressor in time, NiIs expressed at Δ t1Shaft power, Q, of the oxygen compressor at time inThe volume flow at time i is shown, k is the oxygen compressor inlet guide vane opening value at time i, t0 shows the start time, and tn shows the end time.
Further, the energy consumption for oxygen production saved by the reduced oxygen dispersion is expressed as:
ΔQvi＝Qva-Qvi
wherein, Δ E represents the energy consumption for oxygen generation saved by simulating the reduced oxygen diffusion amount, η represents the unit consumption for oxygen generation, Δ QviRepresents Δ t1Overpressure diffusing oxygen compressor inlet flow Q at moment i in timevaAnd simulating the inlet flow Q of the diffusion oxygen compressorviDifference of (a), QvaRepresents the inlet flow of the oxygen compressor at the moment i in overpressure diffusion, QviAnd the inlet flow of the oxygen compressor at the moment i in the simulated diffusion is shown.
Further, the total amount of energy saving is expressed as:
Egeneral assembly＝ΔE+ΔW
Wherein E isGeneral assemblyRepresenting a total energy saving.
The embodiment of the invention also provides an energy-saving system for reducing the energy consumption of an oxygen pipe network transmission and distribution system, which comprises:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system;
the simulation module is used for adjusting control parameters to carry out diffusion simulation according to the oxygen demand of a user side through the established active diffusion energy-saving model so as to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in the oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
the calibration module is used for executing the distribution module if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system;
and the distribution module is used for calculating the total energy consumption saving amount, outputting the control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing the oxygen according to the control parameter corresponding to the maximum value.
The technical scheme of the invention has the following beneficial effects:
according to the scheme, according to the oxygen demand of a user side, in combination with the constraint condition of operation of a transmission and distribution system, four control parameters, namely the opening value of an inlet guide vane of an oxygen compressor, the opening adjusting time and the opening time of a medium-pressure pipeline diffusion valve, are adjusted through an active diffusion energy-saving model to obtain the time change of the outlet pressure of the oxygen compressor and the inlet pressure of the medium-pressure pipeline diffusion valve in the transmission and distribution system of the oxygen pipeline in the operation process until the result obtained by diffusion simulation meets the constraint condition of operation of the transmission and distribution system, the total energy consumption is saved, and the control parameter corresponding to the maximum value of the total energy consumption is output; and calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value. Therefore, on the premise of ensuring the safe and stable operation of the user demand and the transmission and distribution system, the oxygen produced by the air separation system can be fully utilized, the oxygen utilization rate is improved, the compression energy consumption of the transmission and distribution system, particularly an oxygen compressor, is reduced, the safe and energy-saving operation of the transmission and distribution system is ensured, and the energy-saving purposes of reducing the oxygen production energy consumption saved by the oxygen dispersion amount and reducing the compression energy consumption of the oxygen compressor are achieved.
Drawings
Fig. 1 is a schematic flow chart of an energy saving method for reducing energy consumption of an oxygen pipe network transmission and distribution system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an oxygen pipe network transmission and distribution system of a gas company of a certain iron and steel enterprise according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for determining optimal control parameters for reducing energy consumption of an oxygen pipe network transmission and distribution system of a gas company in an iron and steel enterprise according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an active dissipation energy-saving model of an oxygen hose network transmission and distribution system according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a centrifugal compressor inlet section with adjustable inlet guide vanes provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a hybrid bleeding start point position provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an energy saving system for reducing energy consumption of an oxygen pipe network transmission and distribution system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides an energy-saving method and system for reducing energy consumption of an oxygen pipe network transmission and distribution system, aiming at the problem that the compression energy consumption and oxygen generation energy consumption of an oxygen compressor are high due to the existing passive diffusion mode.
Example one
As shown in fig. 1, an energy saving method for reducing energy consumption of an oxygen pipe network transmission and distribution system according to an embodiment of the present invention includes:
s101, establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system;
s102, adjusting control parameters to carry out diffusion simulation through an established active diffusion energy-saving model according to the oxygen demand of a user side to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
s103, if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, executing S104;
and S104, calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value.
According to the energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system, according to the oxygen demand of a user side and in combination with the constraint condition of the operation of the transmission and distribution system, four control parameters, namely the opening value of an inlet guide vane of an oxygen compressor, the opening adjusting time and the opening time of a medium-pressure pipeline diffusion valve are adjusted through an active diffusion energy-saving model, so that the time change of the outlet pressure of the oxygen compressor and the inlet pressure of the medium-pressure pipeline diffusion valve in the oxygen pipe network transmission and distribution system in the operation process is obtained until the result obtained through diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, the total energy consumption is calculated, and the control parameter corresponding to the maximum value of the; and calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value. Therefore, on the premise of ensuring the safe and stable operation of the user demand and the transmission and distribution system, the oxygen produced by the air separation system can be fully utilized, the oxygen utilization rate is improved, the compression energy consumption of the transmission and distribution system, particularly an oxygen compressor, is reduced, the safe and energy-saving operation of the transmission and distribution system is ensured, and the energy-saving purposes of reducing the oxygen production energy consumption saved by the oxygen dispersion amount and reducing the compression energy consumption of the oxygen compressor are achieved.
The energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system can reduce the energy consumption of the oxygen pipe network transmission and distribution system of a gas company of a steel enterprise, provide guidance for gas production scheduling and energy-saving control of the steel enterprise, and increase economic benefits for the enterprise.
The energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the embodiment of the invention specifically comprises the following steps:
s101, establishing an active diffusion energy-saving model of the oxygen pipe network transmission and distribution system.
In this embodiment, taking gas company a as an example, an active dissipation energy-saving model of an oxygen pipe network transmission and distribution system of gas company a is established. All components in the active diffusion energy-saving model are consistent with parameters of a real object, so that the accuracy of the model is guaranteed.
In this embodiment, the oxygen flow Q outputted from the air separation system is actually producedV1Oxygen consumption Q of the user sideV2(for reflecting the oxygen demand on the user side) as an analytical sample. Selecting oxygen flow Q output by the air separation system within delta t time according to the enterprise production planV1Oxygen consumption Q of the user sideV2As input parameters for the model.
S102, adjusting control parameters to carry out diffusion simulation according to oxygen demand of a user side through an established active diffusion energy-saving model to obtain time variation of outlet pressure of an oxygen compressor and inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process, and specifically, the method comprises the following steps:
s1021, according to the oxygen demand of the user side, the opening k and the opening adjusting time t of the inlet guide vane of the oxygen compressor are adjusted in the active diffusion energy-saving model1And opening degree adjustment time length delta t1Obtaining the time change of the outlet pressure Pa of the oxygen compressor and the inlet pressure Pb of the medium-pressure pipeline relief valve in the operation process;
s1022, judging whether a result obtained by the diffusion simulation meets the operation constraint condition of the transmission and distribution system, if not, opening a medium-pressure pipeline diffusion valve, and returning to S1021 for mixed diffusion simulation; otherwise, S103 is executed.
As a preferred embodiment, the determining whether the result obtained by the diffusion simulation satisfies the constraint condition of the operation of the transmission and distribution system includes:
judging whether the maximum pressure Pa of the outlet of the oxygen compressor, the maximum pressure Pb of a bleed valve of the medium-pressure pipeline and the regulating range delta k of the opening degree of the inlet guide vane of the oxygen compressor meet the following conditions: pa ≦ the first threshold (assuming that the first threshold is 2.70MPa), Pb ≦ the second threshold (assuming that the second threshold is 2.53MPa), and Δ k ≦ the third threshold (assuming that the third threshold is 5 °).
And S103, if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, executing S104.
In this embodiment, if the result obtained by the diffusion simulation satisfies: executing S104 under the constraint conditions that Pa is less than or equal to 2.70MPa, Pb is less than or equal to 2.53MPa and delta k is less than or equal to 5 degrees; otherwise, the medium-pressure pipeline relief valve is opened, and the step returns to S1021 to perform mixed relief simulation, specifically: increasing the opening time delta t of the bleeding valve of the medium-pressure pipeline2The process returns to S1021 to perform the hybrid diffusion simulation.
In this embodiment, the opening time of the medium-pressure pipeline bleeding valve is the time when Pb is greater than 2.53MPa for the first time, and the opening time delta t of the medium-pressure pipeline bleeding valve2Gradually increasing from the shortest time period.
In this embodiment, the energy consumption saving source mainly comes from two aspects:
1) oxygen compressor compression energy consumption change caused by oxygen flow change of oxygen compressor
In this embodiment, for the oxygen compressor of gas company a, the change in the compression energy consumption of the oxygen compressor caused by the change in the oxygen flow rate of the oxygen compressor is represented as:
ΔW＝W1-W2
W1、W2the calculation formula of (2) is as follows:
Ni＝-7.1931*10-6*Qn 2-0.96632*k2+0.0047768Qn*k+0.63358*Qn-159.56*k-4902.9
wherein Δ W represents Δ t1The compression energy consumption of the oxygen compressor is reduced in time, W represents the total energy consumption of the oxygen compressor, W1Represents Δ t1Time superTotal energy consumption, W, of pressure-relief oxygen press2Represents Δ t1Total energy consumption of simulated diffusion oxygen compressor in time, NiIs expressed at Δ t1Shaft power, Q, of the oxygen compressor at time inThe volume flow at time i is shown, k is the oxygen compressor inlet guide vane opening value at time i, t0 shows the start time, and tn shows the end time.
2) Reduced oxygen generation energy consumption with reduced oxygen emissions
In this embodiment, the energy consumption for oxygen generation saved by the reduced oxygen emission amount is expressed as:
ΔQvi＝Qva-Qvi
wherein, Δ E represents the energy consumption for oxygen generation saved by simulating the reduced oxygen diffusion amount, η represents the unit consumption for oxygen generation, Δ QviRepresents Δ t1Overpressure diffusing oxygen compressor inlet flow Q at moment i in timevaAnd simulating the inlet flow Q of the diffusion oxygen compressorviDifference of (a), QvaRepresents the inlet flow of the oxygen compressor at the moment i in overpressure diffusion, QviAnd the inlet flow of the oxygen compressor at the moment i in the simulated diffusion is shown.
In this embodiment, the total amount of energy consumption saved according to 1) and 2) is:
Egeneral assembly＝ΔE+ΔW
Wherein E isGeneral assemblyRepresenting a total energy saving.
In this embodiment, the control parameter corresponding to the maximum value of the total energy consumption saving amount is used as the optimal parameter.
And S104, distributing the oxygen according to the control parameter corresponding to the maximum value of the total energy consumption saving amount.
In order to better understand the energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the embodiment of the invention, taking the oxygen pipe network transmission and distribution system of a certain steel enterprise gas company as an example, as shown in fig. 2, the energy saving method is explained in detail:
oxygen is stably produced by an air separation system, the fluctuation of oxygen for converter users causes the instability of the pressure of a pipe network, and the oxygen needs to be diffused when overpressure (the medium-pressure pipeline pressure is more than 2.70MPa) exists, so that the safe operation of the pipe network system is ensured, wherein the oxygen consumption of the converter users in a certain period is shown in Table 1.
TABLE 1 oxygen consumption by converter users during a certain period of time
The method for determining the optimal control parameter for reducing the energy consumption of the oxygen pipe network transmission and distribution system of the gas company of the iron and steel enterprise provided by the embodiment of the invention, as shown in fig. 3, may specifically include the following steps:
a1, according to the figure 2, establishing an active diffusion energy-saving model (also called as energy-saving control mathematical model) of the oxygen pipe network transmission and distribution system, as shown in figure 4;
a2, inputting the oxygen demand of the user side in a certain future time delta t (more than 100min), and dynamically simulating to obtain the moment of overpressure release and the opening duration of the release valve according to the oxygen law of the converter user;
a3, adjusting the opening degree, the opening degree adjusting time and the opening degree adjusting duration of the inlet guide vane of the oxygen compressor, as shown in FIG. 5, wherein the adjusting range delta k of the opening degree of the inlet guide vane of the oxygen compressor needs to be within a safe range;
a4, performing diffusion simulation in an active diffusion energy-saving model to obtain the time variation of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process;
a5, verifying the simulation result: judging whether the maximum pressure Pa of the outlet of the oxygen compressor, the maximum pressure Pb of a bleeding valve of a medium-pressure pipeline and the regulating range Ak of the opening degree of the inlet guide vane of the oxygen compressor meet the following conditions: pa is less than or equal to 2.70MPa, Pb is less than or equal to 2.53MPa, and delta k is less than or equal to 5 degrees, if so, executing the step A6; otherwise, opening the medium-pressure pipeline relief valve, returning to the step A3 to perform mixed relief simulation, wherein the mixed relief position is shown in FIG. 6, the opening time of the relief valve is the first Pb >2.53MPa, the opening time gradually increases from the shortest time, the simulation is repeated, and the simulation result is verified;
and A6, calculating the total energy consumption saving amount, and outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount as an optimal control parameter.
In this embodiment, the energy saving total amount is calculated with the goal of reducing the energy consumption of the oxygen pipe network transmission and distribution, the control parameter corresponding to the maximum value of the energy saving total amount is output, oxygen is transmitted and distributed according to the control parameter corresponding to the maximum value, from the change situation of the pressure of the oxygen pipe network transmission and distribution system, the pressure of the oxygen pipe network transmission and distribution system is effectively adjusted, and the energy saving effect of mixing and diffusing is obvious.
In summary, the energy saving method for reducing energy consumption of an oxygen pipe network transmission and distribution system provided by this embodiment, aiming at the contradiction between continuous and stable oxygen supply of an air separation system and intermittent oxygen consumption of a user (oxygen demand of a user side), can fully exert the adjusting function of an inlet guide vane and a medium-pressure pipeline bleeding valve of an oxygen compressor of the oxygen pipe network transmission and distribution system by using an active bleeding energy saving model, simulate the outlet pressure of the oxygen compressor in the oxygen pipe network transmission and distribution system and the inlet pressure of the medium-pressure pipeline bleeding valve, obtain an optimal control parameter for reducing energy consumption of the transmission and distribution system through simulation, realize reasonable distribution of oxygen amount between the air separation system and the user side according to the obtained optimal control parameter, achieve the energy saving purposes of reducing oxygen generation energy consumption and reducing compression energy consumption of the oxygen compressor by reducing oxygen diffusion amount, and improve the buffering capacity of the transmission and distribution system and the economic.
Example two
The energy saving system for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the invention corresponds to the specific embodiment of the energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the invention, and the energy saving system for reducing the energy consumption of the oxygen pipe network transmission and distribution system can achieve the purpose of the invention by executing the flow steps in the specific embodiment of the method, so the explanation in the specific embodiment of the energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the invention is also applicable to the specific embodiment of the energy saving system for reducing the energy consumption of the oxygen pipe network transmission and distribution system provided by the invention, and the explanation in the following specific embodiment of the invention will not be repeated.
As shown in fig. 7, an embodiment of the present invention further provides an energy saving system for reducing energy consumption of an oxygen pipe network transmission and distribution system, including:
the building module 11 is used for building an active diffusion energy-saving model of the oxygen pipe network transmission and distribution system;
the simulation module 12 is used for adjusting control parameters to perform diffusion simulation according to the oxygen demand of the user side through the established active diffusion energy-saving model to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in the oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
the checking module 13 is configured to execute the distribution module if a result obtained by the diffusion simulation meets a constraint condition of operation of the transmission and distribution system;
and the distribution module 14 is used for calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing the oxygen according to the control parameter corresponding to the maximum value.
According to the energy-saving system for reducing the energy consumption of the oxygen pipe network transmission and distribution system, according to the oxygen demand of a user side and in combination with the constraint condition of the operation of the transmission and distribution system, four control parameters, namely the opening value of an inlet guide vane of an oxygen compressor, the opening adjusting time and the opening time of a medium-pressure pipeline diffusion valve are adjusted through an active diffusion energy-saving model, so that the time change of the outlet pressure of the oxygen compressor and the inlet pressure of the medium-pressure pipeline diffusion valve in the oxygen pipe network transmission and distribution system in the operation process is obtained until the result obtained through diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, the total energy consumption is calculated, and the control parameter corresponding to the maximum value of the; and calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value. Therefore, on the premise of ensuring the safe and stable operation of the user demand and the transmission and distribution system, the oxygen produced by the air separation system can be fully utilized, the oxygen utilization rate is improved, the compression energy consumption of the transmission and distribution system, particularly an oxygen compressor, is reduced, the safe and energy-saving operation of the transmission and distribution system is ensured, and the energy-saving purposes of reducing the oxygen production energy consumption saved by the oxygen dispersion amount and reducing the compression energy consumption of the oxygen compressor are achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An energy-saving method for reducing energy consumption of an oxygen pipe network transmission and distribution system is characterized by comprising the following steps:
s101, establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system;
s102, adjusting control parameters to carry out diffusion simulation through an established active diffusion energy-saving model according to the oxygen demand of a user side to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in an oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
s103, if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system, executing S104;
and S104, calculating the total energy consumption saving amount, outputting a control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing oxygen according to the control parameter corresponding to the maximum value.
2. The energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 1, wherein the obtaining of the time variation of the outlet pressure of the oxygen compressor and the inlet pressure of the medium-pressure pipeline bleeding valve in the oxygen pipe network transmission and distribution system during the operation process by adjusting the control parameters according to the oxygen demand of the user side through the established active bleeding energy-saving model comprises:
s1021, adjusting the opening k and the opening adjusting time t of the inlet guide vane of the oxygen compressor through the established active diffusion energy-saving model according to the oxygen demand of the user side1And opening degree adjustment time length delta t1Obtaining the time change of the outlet pressure Pa of the oxygen compressor and the inlet pressure Pb of the medium-pressure pipeline relief valve in the operation process;
s1022, judging whether a result obtained by the diffusion simulation meets the operation constraint condition of the transmission and distribution system, if not, opening a medium-pressure pipeline diffusion valve, and returning to S1021 for mixed diffusion simulation; otherwise, S103 is executed.
3. The energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 2, wherein the judging whether the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system comprises:
judging whether the maximum pressure Pa of the outlet of the oxygen compressor, the maximum pressure Pb of a bleed valve of the medium-pressure pipeline and the regulating range delta k of the opening degree of the inlet guide vane of the oxygen compressor meet the following conditions: pa is less than or equal to the first threshold, Pb is less than or equal to the second threshold, and delta k is less than or equal to the third threshold.
4. The energy-saving method for reducing the energy consumption of an oxygen pipe network transmission and distribution system according to claim 2, wherein the opening time of the medium-pressure pipeline bleeding valve is Pb for the first time>At the moment of a second threshold value, the opening time delta t of the medium-pressure pipeline relief valve2Gradually increasing from the shortest time period.
5. The energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 1, wherein the energy consumption saving method comprises the following steps: the change of the compression energy consumption of the oxygen compressor caused by the change of the oxygen flow of the oxygen compressor and the oxygen generation energy consumption saved by the reduced oxygen dispersion amount.
6. The energy-saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 5, wherein the change of the compression energy consumption of the oxygen compressor caused by the change of the oxygen flow of the oxygen compressor is represented as:
ΔW＝W1-W2
W1、W2the calculation formula of (2) is as follows:
Ni＝-7.1931*10-6*Qn 2-0.96632*k2+0.0047768Qn*k+0.63358*Qn-159.56*k-4902.9
wherein Δ W represents Δ t1The compression energy consumption of the oxygen compressor is reduced in time, W represents the total energy consumption of the oxygen compressor, W1Represents Δ t1Total energy consumption of overpressure relieving oxygen compressor in time, W2Represents Δ t1Total energy consumption of simulated diffusion oxygen compressor in time, NiIs expressed at Δ t1Shaft power, Q, of the oxygen compressor at time inThe volume flow at time i is shown, k is the oxygen compressor inlet guide vane opening value at time i, t0 shows the start time, and tn shows the end time.
7. The energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 6, wherein the energy consumption of oxygen generation saved by the reduced oxygen emission amount is expressed as:
ΔQvi＝Qva-Qvi
wherein, Δ E represents the energy consumption for oxygen generation saved by simulating the reduced oxygen diffusion amount, η represents the unit consumption for oxygen generation, Δ QviRepresents Δ t1Overpressure diffusing oxygen compressor inlet flow Q at moment i in timevaAnd simulating the inlet flow Q of the diffusion oxygen compressorviDifference of (a), QvaRepresents the inlet flow of the oxygen compressor at the moment i in overpressure diffusion, QviAnd the inlet flow of the oxygen compressor at the moment i in the simulated diffusion is shown.
8. The energy saving method for reducing the energy consumption of the oxygen pipe network transmission and distribution system according to claim 7, wherein the total energy consumption is expressed as:
Egeneral assembly＝ΔE+ΔW
Wherein E isGeneral assemblyRepresenting a total energy saving.
9. An energy-saving system for reducing energy consumption of an oxygen pipe network transmission and distribution system is characterized by comprising:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for establishing an active diffusion energy-saving model of an oxygen pipe network transmission and distribution system;
the simulation module is used for adjusting control parameters to carry out diffusion simulation according to the oxygen demand of a user side through the established active diffusion energy-saving model so as to obtain the time change of the outlet pressure of an oxygen compressor and the inlet pressure of a diffusion valve of a medium-pressure pipeline in the oxygen pipe network transmission and distribution system in the operation process; wherein the control parameters include: the opening degree of an inlet guide vane of the oxygen compressor, the opening degree adjusting time and the opening time of a medium-pressure pipeline relief valve are controlled;
the calibration module is used for executing the distribution module if the result obtained by the diffusion simulation meets the constraint condition of the operation of the transmission and distribution system;
and the distribution module is used for calculating the total energy consumption saving amount, outputting the control parameter corresponding to the maximum value of the total energy consumption saving amount, and distributing the oxygen according to the control parameter corresponding to the maximum value.
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