CN108133312B - Agile accounting method for hydrogen-containing gas system - Google Patents
Agile accounting method for hydrogen-containing gas system Download PDFInfo
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 290
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 285
- 239000007789 gas Substances 0.000 title claims abstract description 52
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- 238000004364 calculation method Methods 0.000 claims abstract description 94
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- 239000002994 raw material Substances 0.000 claims description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 230000008901 benefit Effects 0.000 claims description 9
- 150000002431 hydrogen Chemical class 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001294 propane Substances 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims 1
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- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 2
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
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Abstract
A method for agile accounting of a hydrogen-containing gas system, the hydrogen-containing gas system comprising: an associated apparatus for a hydrogen-containing stream; collecting on-line meters of feeding, discharging and measuring streams on the associated devices; analyzing the stream and providing a laboratory management system for the content of each component in the stream; a database system that stores data. The agile accounting method comprises the following steps: establishing a density calculation system for calculating the stream density on line; establishing a plurality of accounting indexes of the correlation device; establishing an index calculation and analysis system for calculation and analysis; and establishing a calculation and analysis result of the client presenting the accounting index. And a plurality of accounting indexes of the correlation device are established from a plurality of angles, so that the user can be helped to comprehensively know and control the operation conditions of the correlation device and the hydrogen system in real time through the client. The conversion of the flow data from volume to mass is realized based on the density calculation system, and the subsequent hydrogen production and consumption balance statistics and accounting index results are ensured to be more accurate and closer to reality.
Description
Technical Field
The invention relates to the technical field of hydrogen systems of oil refining chemical enterprises, in particular to an agile accounting method of a hydrogen-containing gas system.
Background
With the continuous trend of heavy crude oil and poor crude oil, the increasingly high requirements on oil quality and the continuous enhancement of environmental protection regulations, hydrogenation technology is widely applied to refineries. With the increasing consumption of hydrogen, the cost of hydrogen has become second factor next to the cost of crude oil. Therefore, it is necessary to perform fine management and potential increase of the hydrogen system.
The hydrogen system of the refinery enterprise is a system which is huge, has wide related range and complex influence factors and mainly consists of a hydrogen production device, a hydrogen consumption device, a hydrogen purification device and a pipe network connecting the devices. A set of unified information management system is established to carry out unified management on hydrogen systems of refinery enterprises, which becomes a necessary means for improving the fine management level of the whole plant. The current situation is as follows: on one hand, professional hydrogen informatization management systems are less in application, most of refinery enterprises integrate monitoring and management functions of hydrogen systems into MES, public works and other large systems, and basically only pay attention to production and consumption data of hydrogen aiming at monitoring and management of the hydrogen systems, so that the hydrogen informatization management systems are not comprehensive, detailed and deep; on the other hand, one of the most important objectives of management of a hydrogen system is to achieve balance of the hydrogen system. Since most meters for measuring hydrogen-containing streams in general enterprises are volume flow meters and mass flow meters are few (mass flow meters for gas streams with different components are more expensive than volume flow meters), when hydrogen system balance calculation is performed, conversion of volume flow to mass flow is required, and density becomes an essential intermediate variable for realizing the conversion. However, for hydrogen-containing streams, enterprises are generally rarely equipped with a complete online density table, and therefore, the value of the density is often a fixed and unchangeable empirical value or the empirical value is manually corrected every 1-2 months. The method for calculating the production and consumption balance condition of the hydrogen system is not accurate and timely.
Disclosure of Invention
In order to solve the problems that the existing information management system is not comprehensive, careful and deep in management of a hydrogen system, and inaccurate and timely in balance calculation of the hydrogen system, the application provides an agile accounting method of a hydrogen-containing gas system, wherein the hydrogen-containing gas system comprises:
an associated plant for a hydrogen-containing stream, the associated plant comprising a hydrogen production plant, a hydrogen consumption plant and a hydrogen purification plant;
on-line meters for collecting feed, discharge, and metered streams on associated plants, including but not limited to: flow meter, density meter, purity meter;
a laboratory management system for analyzing streams including, but not limited to: a hydrogen-containing stream, a feed stream;
a database system for storing data including, but not limited to: the data acquisition of the on-line meter, the input data of the manual input system, the calculation result of the density calculation system and the calculation result of the index calculation analysis system.
The agile accounting method comprises the following steps:
establishing a manual entry system for manually entering relevant data, including but not limited to: empirical density values, standard density values, financial data;
establishing a density calculation system for calculating the density of the stream on line, and setting a preset condition for calculating the density of the stream by the density calculation system;
establishing a plurality of accounting indexes of the correlation device according to a data source stored in the database system;
establishing an index calculation analysis system for calculating and analyzing a plurality of items of accounting indexes;
and establishing a client for displaying the calculation and analysis results of the plurality of items of accounting indexes.
In one embodiment, the preset conditions for the density calculation system to calculate the stream density include:
if the on-line instrument meter has a density acquisition function, the density calculation system directly acquires density data from the database system as the density data of the stream;
if the on-line instrument meter does not have the density acquisition function, the density calculation system acquires the content of each component of the stream from a laboratory management system and the standard density value of each corresponding component from the manual input system, and calculates the density data of the stream according to the content of each component and the corresponding standard density value;
and if the on-line instrument meter does not have a density acquisition function and the stream has no component content or the component content of the stream is not updated in time, the density calculation system directly acquires a density empirical value from the manual input system as the density of the stream.
In one embodiment, the density data for each stream is calculated based on the component content of each stream and the corresponding normalized density value, and the density calculation formula is:
ρcomputing＝∑xi×RiWhere ρ isComputingCalculating a value for the density of the target stream, i being a positive integer from 1 to n, n depending on the number of component species in the stream, xiIs the percentage of the ith component, RiIs the standard density value of the ith component.
In one embodiment, in the process of calculating the density data of the streams according to the component contents of the streams and the corresponding standard density values, the density calculation system further comprises the steps of carrying out automatic fixed-point recalculation on the calculated density data of the streams according to a preset frequency, and storing the recalculated density calculation results into the database system.
In one embodiment, the method further comprises the step of setting an index calculation and analysis system to synchronously and automatically recalculate the calculated indexes related to the density data automatically recalculated in a fixed point mode, and storing the recalculated index calculation result into the database system.
In one embodiment, the plurality of accounting indexes of the association device specifically include:
the accounting indicators for a hydrogen production plant include, but are not limited to: raw material consumption, hydrogen output per unit, hydrogen output benefit, hydrogen production per unit and the like;
accounting indicators for hydrogen consuming devices include, but are not limited to: raw material treatment capacity, hydrogen consumption, waste hydrogen gas discharge capacity, unit hydrogen consumption, hydrogen consumption cost, unit hydrogen consumption cost, hydrogen utilization rate and the like;
the accounting indicators for the hydrogen purification apparatus include, but are not limited to: total amount of raw gas, flow rate of crude hydrogen, low-component gas flow rate, product hydrogen flow rate, analytic gas flow rate, recovery rate, value increment and the like.
In one embodiment, the components of the hydrogen-containing stream include, but are not limited to: hydrogen, methane, air, nitrogen, ethane, propane, butylene, and the like.
In one embodiment, an index calculation analysis system includes:
the real-time accounting module is used for calculating and updating a plurality of accounting indexes of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the comparison analysis module is used for comparing the variation trends of the same index in the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the historical query module is used for performing historical query on a plurality of accounting index results of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the index overview module is used for inquiring the change trend of the sum or average value of each index in the hydrogen production device, the hydrogen consumption device and the hydrogen purification device, and analyzing the proportion condition and the ranking condition of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device on one index and the same proportion and ring proportion result of each index;
and the balance statistical module is used for presenting the balance condition of the hydrogen pipe network.
In one embodiment, the results of the real-time accounting module, the comparative analysis module, the historical query module, the index overview module and the balance statistics module are presented on the client in the form of a list or a trend graph.
According to the method of the embodiment, a plurality of items of accounting indexes of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device are established from multiple angles, a user is helped to comprehensively know and master the operation conditions of the hydrogen production device, the hydrogen consumption device, the hydrogen purification device and the hydrogen system in real time through a client, and meanwhile, the flow density is calculated on line through preset conditions, so that the conversion of the flow data of the flow from volume to mass is realized, and the follow-up hydrogen production and consumption balance statistics and the accounting index result are more accurate and closer to reality.
Drawings
FIG. 1 is a schematic diagram of a method for agile accounting of a hydrogen-containing gas system;
FIG. 2 is a flow chart of density calculation;
FIG. 3 is a diagram illustrating accounting indexes for various types of devices;
FIG. 4 is a diagram of a software platform of the index calculation analysis system.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
The present embodiment provides a method for agile accounting of a hydrogen-containing gas system, which is schematically shown in fig. 1, wherein the existing hydrogen-containing gas system comprises: an associated plant 1 containing a hydrogen stream, the associated plant 1 comprising a hydrogen production plant 11, a hydrogen consumption plant 12 and a hydrogen purification plant 13; an online meter (not identified in the figure) on the association device 1; a DCS system 8 for collecting meter and sensor data in the production line to control production; a laboratory management system 4 for analyzing the stream and providing the content of each component in the stream; a database system 2 for storing data.
The method proposed in this example establishes the following: establishing a manual entry system 3 for manually entering related data; establishing a density calculation system 5 for calculating the density of the stream on line, and setting a preset condition for calculating the density of the stream by the density calculation system 5; setting a plurality of items of accounting indexes of the correlation device 1 according to a data source stored in the database system 2; establishing an index calculation and analysis system 6 for calculating and analyzing a plurality of items of accounting indexes; establishing a client 7 for displaying the calculation results of the plurality of items of accounting indexes; in addition, the database system 2 is also used for storing the data manually entered 3, the calculation results of the density calculation system 5 and the index calculation analysis system 6.
Wherein, the mutual operational relationship of each component is: the online meter collects the data of the flow, density and purity of the feeding, discharging and metering streams on the correlation device 1 and transmits the data to the database system 2 through the DCS system 8, wherein the DCS system 8 is a distributed control system and is used for collecting the data of meters and sensors in a production line to perform production control, and the data collection function of the system is utilized to obtain the data of the flow, the online density and the purity of each stream; the density calculation system 5 extracts data from the database system 2, the laboratory management system 4 and the manual entry system 3 according to preset conditions to calculate density values on line; since the accounting indexes are related to cost and benefit calculation, the financial system 9 is added in the embodiment, the financial system 9 is used for providing financial data, such as the unit price of hydrogen consumption, the unit price of hydrogen production, the unit price of low gas, and the like, therefore, the index calculation and analysis system 6 extracts data from the database system 2, the laboratory management system 4, the financial system 9 and the density calculation system 5, calculates each accounting index on line, and presents the calculation result of the accounting index to the client 7.
It should be noted that if the enterprise applying the method of the present embodiment has no financial system, such as financial data of the price of the stream, the corresponding financial data can be entered through the manual entry system 3.
The detailed description of the components in this example follows.
The hydrogen production device 11 is used for producing hydrogen for the hydrogen consumption device 12, and for example, comprises a coal chemical industry device, a natural gas/dry gas hydrogen production device and the like; the hydrogen consuming device 12 is used for processing heavy oil, and the process needs to consume a large amount of hydrogen, such as hydrocracking, residual oil hydrogenation, wax oil hydrogenation, diesel oil hydrogenation, gasoline hydrogenation and the like; the hydrogen purification plant 13 is used to purify the low purity hydrogen-containing stream in the hydrogen piping network into a useable high purity hydrogen-containing stream, including, for example, PSA plants, membrane separations, and the like.
The volume purity of the hydrogen-containing stream varies from 0.01% to 99.99%, and the hydrogen-containing stream contains other components besides the hydrogen component, including but not limited to: methane, air, nitrogen, ethane, propane, butylene, and the like. In a refinery, the hydrogen-containing stream includes, for example, a fresh hydrogen stream, a hydrogen-producing stream, a low-split gas stream, a dry gas stream, and the like.
Feed streams involved, including but not limited to: raw materials used in the hydrogen production apparatus 11, raw materials processed by the hydrogen consumption apparatus 12, and the like.
The on-line meters are used to collect data on the flow, density and purity of the feed, discharge and hydrogen-containing streams of the hydrogen production plant 11, hydrogen consumption plant 12 and hydrogen purification plant 13 (the number of density/purity on-line meters available in a typical enterprise is small). Wherein the feed stream comprises, for example, natural gas, dry gas entering the hydrogen production plant 11, and atmospheric and vacuum distillates, residual oil, etc. entering the hydrogen consumption plant 12; the hydrogen-containing stream includes, for example, fresh hydrogen entering the hydrogen consuming apparatus 12, raw gas entering the hydrogen purifying apparatus 13, low-grade and dry gas exiting the hydrogen consuming apparatus 12, hydrogen exiting the hydrogen producing apparatus 11, product hydrogen and desorbed gas exiting the hydrogen purifying apparatus 13, and the like.
The database system 2 is used for storing data from the DCS 8 and providing data source support for density calculation and accounting index calculation. The database system 2 is used for storing the input data of the manual input system and the calculation results of the density calculation system and the index calculation analysis system.
The manual entry system 3 is used as an input end of external data, and is used for entering some constants required by the calculation of the accounting index, including: the density values R of the components required for calculating the density under standard conditionsiEmpirical values of density ρ for each streamEmpirical valueAnd the like.
A laboratory management system 4(LIMS), which is itself used to perform experimental analysis on the raw material samples and the product samples to obtain various analysis indexes of the raw material and the product, including: content of components, viscosity, flash point, penetration, etc. this example uses the system to obtain data on the content of components of each stream.
The density calculation system 5 is used for calculating the density of each stream according to preset conditions, and the purpose of calculating the density is to support the conversion of the flow data of each stream from volume to mass (generally, most of the flow tables owned by enterprises are volume tables, and the rest are mass tables).
The preset conditions of this example include the following cases:
1) if the on-line meter has a density acquisition function, the density calculation system 5 directly acquires density data from the database system 2 as density data of the stream.
2) If the on-line instrument meter does not have the density acquisition function, the density calculation system 5 acquires the content of each component of the stream from the laboratory management system 4 and the standard density value of each corresponding component from the manual input system 3, and calculates the density data of the stream according to the content of each component and the corresponding standard density value.
The density calculation formula is as follows: rhoComputing＝∑xi×RiWhere ρ isComputingCalculating the value of the density of the target stream, i being a positive integer from 1 to n, n depending on the number of component species in the stream, xiIs the percentage of the ith component, RiIs the standard density value of the ith component.
3) If the on-line instrument meter does not have the density acquisition function, and the stream has no component content or the component content of the stream is not updated in time, the density calculation system 5 directly acquires a density empirical value from the manual input system 3 as the density of the stream; in this example, if the stream has no analysis data of the component content or the analysis data of the component content in the laboratory management system 4 is not updated for a long time (in this example, the set non-update period is 7 days), the empirical value ρ is taken for the densityEmpirical value，ρEmpirical valueObtained from the manual entry system 3.
It should be noted that, in practical cases, the basic data for calculating the density is mostly from the laboratory management system 4. But the data of the laboratory management system 4 are from manual analysis and therefore have the disadvantage of lagging in time, for example: the data at a certain point in time is updated only after a few hours. To overcome this drawback and ensure the accuracy of the data, the density calculation system 5 of this example has the function of automatically performing a fixed-point recalculation on the calculated density data of the stream at a preset frequency, which in this embodiment is specifically 1 day, i.e. the recalculation interval is 1 day. And the recalculated density calculation result is stored in the database system 2.
With the preset conditions set as described above, a schematic calculation flow of the density calculation system 5 of this example is shown in fig. 2.
The index calculation and analysis system 6 is used for calculating various calculation indexes of the hydrogen production device 11, the hydrogen consumption device 12 and the hydrogen purification device 13. Fig. 3 shows the calculation index items of the hydrogen production device 11, the hydrogen consumption device 12, and the hydrogen purification device 13 in this embodiment. The calculation of each index of each device is described in detail below.
Firstly, the hydrogen production device 11 sets up six indexes, which are respectively:
the raw material consumption amount M indicates the mass flow of the raw material that the hydrogen production apparatus 11 needs to consume for producing hydrogen. If the stream has an online mass flow meter, directly acquiring mass flow data from the database system 2 after the data acquired by the meter is stored in the database system 2; if the stream only has an online volume flow meter, the density calculation system 5 is required to calculate the density of the stream, and the mass flow of the target stream is calculated by a formula of 'volume flow x density'.
The hydrogen production amount V indicates the volume flow rate of hydrogen produced by the hydrogen production apparatus 11. The stream generally has an online volume flow meter, and volume flow data is directly obtained from the database system 2 after data collected by the meter is stored in the database system 2.
The hydrogen production amount M indicates the mass flow rate of hydrogen produced by the hydrogen production apparatus 11. The stream only has an online volume flow meter, and the density calculation system 5 is required to calculate the density of the stream, and the mass flow of the target stream is calculated by a formula of 'volume flow multiplied by density'.
The unit hydrogen production refers to the hydrogen produced by consuming unit raw materials, and the calculation formula is as follows: the unit hydrogen production is calculated from the hydrogen production M and the raw material consumption M in the above description.
The benefit of hydrogen production refers to the value of hydrogen produced by the hydrogen production device 11, and the calculation formula is as follows: the hydrogen production efficiency is equal to the hydrogen production quantity M multiplied by the hydrogen production unit price. Calculated from the foregoing hydrogen production M and hydrogen production unit price data taken from the finance system 9.
The unit hydrogen production benefit refers to the value of hydrogen produced by the hydrogen production device 11 consuming unit raw materials, and the calculation formula is as follows: the unit hydrogen production benefit is the hydrogen production benefit/raw material consumption M. The method is obtained by calculating the hydrogen production benefit and the raw material consumption M.
Secondly, the hydrogen consuming apparatus 12 establishes eight indexes, which are:
the raw material treatment amount M indicates the mass flow rate of the raw material processed by the hydrogen consuming apparatus 12. If the stream has an online mass flow meter, directly acquiring mass flow data from the database system 2 after the data acquired by the meter is stored in the database system 2; if the stream only has an online volume flow meter, the density calculation system 5 is required to calculate the density of the stream, and the mass flow of the target stream is calculated by a formula of 'volume flow x density'.
The exhaust hydrogen gas emission amount refers to the sum of the volume flow rates of hydrogen-containing gas streams such as low-component gas and dry gas emitted from the hydrogen consuming device 12.
The hydrogen consumption V refers to the volume flow rate of hydrogen consumed by the hydrogen consuming apparatus 12.
The two streams generally have online volume flow meters, and after data collected by the meters are stored in the database system 2, the volume flow data of the target stream is directly obtained from the database system 2.
The hydrogen consumption amount M refers to the mass flow rate of hydrogen consumed by the hydrogen consuming apparatus 12. The stream only has an online volume flow meter, and the density calculation system 5 is required to calculate the density of the stream, and the mass flow of the target stream is calculated by a formula of 'volume flow multiplied by density'.
The unit hydrogen consumption refers to the hydrogen consumption for processing unit raw materials, and the calculation formula is as follows: the unit hydrogen consumption is calculated from the hydrogen consumption M and the treatment amount M described above, i.e., the hydrogen consumption M/treatment amount M.
The cost of hydrogen consumption, which refers to the value of hydrogen consumed by the hydrogen consumption device 12, is calculated by the following formula: the hydrogen consumption cost is equal to the hydrogen consumption quantity M multiplied by the hydrogen consumption unit price. Calculated from the foregoing hydrogen consumption amount M and the hydrogen consumption unit price data taken from the finance system 9.
The unit hydrogen consumption cost refers to the value of hydrogen consumed by the hydrogen consuming device 12 for processing unit raw materials, and the calculation formula is as follows: the unit hydrogen consumption cost is equal to the hydrogen consumption cost/treatment amount M. Calculated from the foregoing hydrogen consumption cost and the throughput M.
The hydrogen utilization ratio refers to the ratio of the chemical hydrogen consumption of the hydrogen consumption device 12 to the total hydrogen consumption in the hydrogenation process, and the calculation formula is as follows: hydrogen utilization rate (hydrogen consumption V × hydrogen component content in hydrogen consumption stream- Σ waste hydrogen flow × hydrogen component content in hydrogen waste stream)/(hydrogen consumption V × hydrogen component content in hydrogen consumption stream). Wherein, the waste hydrogen refers to hydrogen-containing gas such as low-molecular gas, dry gas and the like. The hydrogen consumption stream and the waste hydrogen stream both have online volume flow meters generally, and after data collected by the meters are stored in the database system 2, the volume flow data of the target stream is directly obtained from the database system 2. The hydrogen component content data in the stream is typically percentage data of volume content taken from the laboratory management system 4 or from an on-line purity meter. Wherein, the component content data acquired by the purity online meter can be stored in the database system 2, and the target data can be directly acquired from the database system 2.
Thirdly, the hydrogen purification device 13 sets eight indexes, which are respectively:
the total amount V of the raw material gas refers to the sum of the volume flows of the raw material gases with low hydrogen purity entering the hydrogen purification device 13 for purification. The feed gas stream here comprises crude hydrogen, low partial gas.
The crude hydrogen flow V refers to the volume flow of the crude hydrogen with lower hydrogen purity entering the hydrogen purification device 13 for purification.
The low partial gas flow rate V indicates a volume flow rate of the low partial gas containing low hydrogen purity which enters the hydrogen purification apparatus 13 for purification.
The desorption gas flow rate V is a volume flow rate of the hydrogen off gas containing low hydrogen purity discharged from the hydrogen purification apparatus 13.
The product hydrogen flow V refers to the volume flow of the stream with high hydrogen purity, which is produced after being purified by the hydrogen purification device 13.
The five streams generally have online volume flow meters, and after data collected by the meters are stored in the database system 2, the volume flow data of the target stream is directly obtained from the database system 2.
The product hydrogen flow rate M refers to the mass flow rate of the stream with high hydrogen purity, which is produced after being purified by the hydrogen purification device 13. The stream only has an online volume flow meter, and the density calculation system 5 is required to calculate the density of the stream, and the mass flow of the target stream is calculated by a formula of 'volume flow multiplied by density'.
The recovery rate is the proportion of the pure hydrogen content in the product hydrogen to the pure hydrogen content in the feed gas, and the calculation formula is as follows: the recovery rate (product hydrogen flow rate V × hydrogen component content in the product hydrogen stream)/(total amount of feed gas V × hydrogen component content in the feed gas mixed stream). The product hydrogen flow rate V and the total amount of feed gas V are obtained as described above. The hydrogen component content data in the stream is typically percentage data of volume content taken from the laboratory management system 4 or from an on-line purity meter. Wherein, the component content data acquired by the purity online meter can be stored in the database system 2, and the target data can be directly acquired from the database system 2.
The value increment refers to increment of stream value of the product hydrogen with high hydrogen purity produced after the raw material gas with low hydrogen purity is purified by the hydrogen purification device 13, and the calculation formula is as follows: the value increment is the product hydrogen flow rate M x the product hydrogen unit price-sigma feed gas flow rate M x the feed gas unit price. The raw material gas comprises crude hydrogen, low-concentration gas and other streams which enter the hydrogen purification device 13 for purification and contain low hydrogen purity, and since the unit prices of different streams are different, the streams need to be respectively priced, and then the prices of each stream are summarized and summed. The product hydrogen and the raw material gas stream only have an online volume flow meter generally, a density calculation system 5 is needed to calculate the density of the stream, and the mass flow of the target stream is calculated through a formula of 'volume flow multiplied by density'. Price data for product hydrogen unit price, feed gas unit price are taken from financial system 9.
Because of the influence of the density calculating system 5, in order to ensure the accuracy of the index calculation, the index calculating and analyzing system 6 also has the function of synchronously and automatically recalculating the accounting index related to the density data by automatic fixed-point recalculation, that is, the index calculating and analyzing system 6 also has the function of automatically fixed-point recalculation, and the recalculation time frequency is consistent with the recalculation frequency of the density calculating system 5, and in this embodiment, the recalculation frequency is 1 day. And the recalculated index calculation result is stored in the database system 2.
Fig. 4 is a schematic diagram of functional module configuration of a software platform of the index calculation and analysis system 6. The following detailed description is made for each functional module:
the real-time accounting module presents the calculation results of the index values of the hydrogen production device 11, the hydrogen consumption device 12 and the hydrogen purification device 13 in a list form, and in this embodiment, the calculation and update frequency of each index is 1 hour.
And the comparison and analysis module is used for comparing the variation trend of the same index in the hydrogen production device 11, the hydrogen consumption device 12 and the hydrogen purification device 13.
And the history inquiry module is used for inquiring the history change trend of each index in the hydrogen production device 11, the hydrogen consumption device 12 and the hydrogen purification device 13.
And the index overview module is used for inquiring the change trend of the sum or average value of each index of each type of device (hydrogen production device/hydrogen consumption device/hydrogen purification device). And simultaneously, the method supports the condition of ranking, the condition of occupation (or the deviation condition from the average value) of each set of devices in the same type of devices.
And the balance statistical module is used for presenting the balance condition of the whole hydrogen pipe network in two expression modes of a list and a historical trend chart from two angles of volume flow balance and mass flow balance.
The client 7 is provided with a software platform of a corresponding index calculation and analysis system, and presents index calculation and analysis results of various devices in a software platform manner, for example, results of a real-time accounting module, a comparison and analysis module, a history query module, an index overview module and a balance statistics module are presented in a list or trend graph manner.
The method of the embodiment provides multi-angle assessment indexes for each set of device and the whole hydrogen system, and helps a user to comprehensively know and control the operation conditions of the device and the hydrogen system in real time. Meanwhile, the method of the embodiment also establishes a set of density calculation method, collects the stream component content data from a density online instrument and a laboratory management system and the manually-entered density empirical value data, and calculates the density of each stream in real time on line by depending on a density calculation model. The conversion of the flow data of the stream from volume to mass is realized based on the online density data, so that the subsequent hydrogen production and consumption balance statistics and accounting index results are more accurate and closer to the actual results.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A method for agile accounting of a hydrogen containing gas system, the hydrogen containing gas system comprising:
an associated plant for a hydrogen-containing stream, the associated plant comprising a hydrogen production plant, a hydrogen consumption plant, and a hydrogen purification plant;
on-line meters to collect feed, discharge, and meter hydrogen-containing streams on the associated plant, including but not limited to: flow meter, density meter, purity meter;
laboratory management systems that analyze streams and provide the content of components in streams, including but not limited to: a hydrogen-containing stream, a feed stream;
a database system for storing data;
the agile accounting method comprises the following steps:
establishing a manual entry system for manually entering related data;
establishing a density calculation system for calculating the density of the stream on line, and setting a preset condition for calculating the density of the stream by the density calculation system;
establishing a plurality of accounting indexes of the correlation device according to a data source stored in a database system;
establishing an index calculation analysis system for calculating and analyzing the plurality of items of accounting indexes;
establishing a client for displaying the calculation and analysis results of the plurality of items of accounting indexes;
the preset conditions for calculating the stream density by the density calculation system comprise:
if the online meter has a density acquisition function, the density calculation system directly acquires density data from the database system as density data of the stream;
if the online meter does not have the density acquisition function, the density calculation system acquires the content of each component of the stream from the laboratory management system and the standard density value of each corresponding component from the manual entry system, and calculates the density data of the stream according to the content of each component and the corresponding standard density value;
and if the online meter does not have a density acquisition function and the stream has no component content or the component content of the stream is not updated in time, the density calculation system directly acquires a density empirical value from the manual entry system as the density of the stream.
2. The method of claim 1, wherein the calculating the density data for the streams based on the component content of each stream and the corresponding standard density value is performed according to the formula:
ρcomputing＝∑xi×RiWhere ρ isComputingCalculating a value for the density of the target stream, i being a positive integer from 1 to n, n depending on the number of component species in the stream, xiIs the percentage content of the ith component,Riis the standard density value of the ith component.
3. The method of claim 2, wherein in calculating the density data for the stream based on the component content of each stream and the corresponding standard density value, the density calculation system further comprises automatically recalculating the calculated density data for the stream at a predetermined frequency and storing the recalculated density calculation results in the database system.
4. The method of claim 3, further comprising configuring the metric calculation analysis system to perform a synchronous automatic fixed point recalculation of accounting metrics associated with the automatically fixed point recalculated density data and storing the recalculated metric calculations in the database system.
5. The method according to claim 1, wherein the plurality of accounting indicators of the correlation device are specifically:
the accounting indicators for the hydrogen production plant include, but are not limited to: raw material consumption, hydrogen output per unit, hydrogen output benefit and hydrogen production benefit per unit;
the accounting indicators for the hydrogen-consuming device include, but are not limited to: raw material treatment capacity, hydrogen consumption, waste hydrogen gas discharge capacity, unit hydrogen consumption, hydrogen consumption cost, unit hydrogen consumption cost and hydrogen utilization rate;
the accounting index of the hydrogen purification apparatus includes, but is not limited to: total amount of raw gas, flow rate of crude hydrogen, low-component gas flow rate, product hydrogen flow rate, analytic gas flow rate, recovery rate and value increment.
6. The method of claim 1, wherein the components of the hydrogen-containing stream include, but are not limited to: hydrogen, methane, air, nitrogen, ethane, propane, butene.
7. The method of claim 1, wherein the metric calculation analysis system comprises:
the real-time accounting module is used for calculating and updating a plurality of accounting indexes of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the comparison and analysis module is used for comparing the variation trends of the same index in the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the historical query module is used for performing historical query on a plurality of accounting index results of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device;
the index overview module is used for inquiring the change trend of the sum or average value of each index in the hydrogen production device, the hydrogen consumption device and the hydrogen purification device, and analyzing the proportion condition and the ranking condition of the hydrogen production device, the hydrogen consumption device and the hydrogen purification device on one index and the result of the same proportion and ring ratio of each index;
and the balance statistical module is used for presenting the balance condition of the hydrogen pipe network.
8. The method of claim 7, wherein results of the real-time accounting module, the comparative analysis module, the historical query module, the index overview module, and the balance statistics module are presented on the client in the form of a list or a trend graph.
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