CN114674585A - Heating capacity measuring method, device and system - Google Patents
Heating capacity measuring method, device and system Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for measuring heat supply capacity, which are characterized in that relevant temperature and pressure data and condensate pipe drain pump data are collected; calculating relevant enthalpy data according to the relevant temperature and pressure data; determining the flow data of the condensate pipe according to the data of the condensate pipe drain pump and the related temperature and pressure data; determining heat supply network drainage flow data according to the related enthalpy data and the condenser pipe flow data; and determining heat supply power data of the heat supply network according to the related enthalpy data and the heat supply network drainage flow data. The invention realizes that when the pressure of the heat supply network drain pipe changes suddenly, a gas-liquid mixture which can not be subjected to accurate flow calculation is formed, and accurate heat supply network water delivery flow data can not be obtained.
Description
Technical Field
The invention relates to the field of heat supply of thermal power plants, in particular to a method, a device and a system for measuring heat supply capacity.
Background
The heat supply of residents is taken as a civil engineering, and the heat supply task of the residents is mainly undertaken by a thermal power plant. The combined heat and power production in thermal power plant is that the high-level heat energy produced by chemical energy of fuel is first used to produce electric energy, and then the heat energy with over-work and reduced taste is used to supply heat to outside. The heat load comprises a process heat load, a heating heat load and a hot water load, and the heating heat load is needed for the heat supply of residents.
Large thermal power plants typically introduce a portion of the intermediate cylinder exhaust (i.e., the heating extraction) into the grid heater. Heating extraction steam releases heat to circulating water in a heating network heater, and the steam is condensed into water and then is sent to a low-pressure heat recovery system in a turbine thermodynamic system through a heating network drain pump; the heat supply network circulating water absorbs heat in the heat supply network heater to generate high-temperature circulating water for supplying heat to heat users, and the heat supply network water after heat supply returns to the heat supply network heater through the heat supply network circulating water pump.
The heating extraction steam is condensed into water after the heat quantity of the heating network heater is released, the condensed water is the drain water of the heating network heater, and the saturation pressure and the saturation temperature are in a positive corresponding relation when the drain water is close to a saturation state. Because the power generation load and the heating load are in a strong coupling relation, the heating load or the power generation load is adjusted, the heating steam extraction flow and the heating pressure fluctuate greatly and frequently due to improper adjustment, when the steam side pressure of the heat supply network heater is reduced suddenly, the corresponding saturation temperature is also reduced correspondingly, at the moment, the drainage temperature is higher than the saturation temperature, drainage can be vaporized and bubbles are generated, steam-water two-phase flow is presented, the drainage flow is inaccurate, the drainage flow is measured accurately and generally in actual operation, and the heating capacity of the heat supply network heater is also inaccurate.
Therefore, how to accurately measure the heating capacity of the heating network heater becomes a problem to be solved urgently in the prior art.
Disclosure of Invention
The invention aims to provide a method, a device and a system for measuring heat supply capacity, which aim to solve the problem that the heat supply capacity of a heat supply network heater in the prior art is not accurately measured.
In order to solve the above technical problem, the present invention provides a method for measuring heat supply capacity, comprising:
collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensation water pipe temperature data, mixed post-condensation water pipe temperature data, condensation water pipe pressure data and condensation water pipe drainage pump data;
determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data;
determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data;
determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data;
and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network.
Optionally, in the method for measuring heat supply capacity, the determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condenser pipe enthalpy data, and the condenser pipe flow data includes:
determining the heat supply network water delivery flow m by1；
Wherein h is enthalpy data of the mixed condenser pipe; h is1Is the heat net hydrophobic enthalpy data; h is a total of2The enthalpy data of the mixed pre-condensation water pipe is obtained; m is as describedAnd (4) flow data of the condensate pipe.
Optionally, in the method for measuring heat supply capacity, the determining heat supply power data of the heat supply network according to the heat extraction pipe enthalpy data, the heat supply network hydrophobic enthalpy data, and the heat supply network hydrophobic flow data includes:
determining the heat supply network heating power data w by the following formula;
wherein h iscAnd obtaining enthalpy data of the heating steam extraction pipe.
A heating capacity measuring device, comprising:
the collection module is used for collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensation water pipe temperature data, mixed post-condensation water pipe temperature data, condensation water pipe pressure data and condensation water pipe drainage pump data;
the enthalpy calculation module is used for determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data;
the condenser pipe flow module is used for determining condenser pipe flow data according to the condenser pipe drainage pump data, the mixed condenser pipe temperature data and the condenser pipe pressure data;
the water delivery pipe flow module is used for determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data;
and the heat supply evaluation module is used for determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the heat supply network drainage enthalpy data and the heat supply network drainage flow data.
A heating capacity measuring apparatus comprising:
a memory for storing a computer program;
a processor for implementing the steps of the heating capacity measuring method according to any one of the above when executing the computer program.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the heating capacity measuring method according to any one of the preceding claims.
A heating capacity measuring system comprises a steam turbine, a heating steam extraction pipe, a heating network heater, a heating network drain pipe, a mixing pipe, a condensed water pipe, a data acquisition assembly and a data processor;
the steam turbine supplies steam to the heat supply network heater through the heating steam extraction pipe, and drain water of the heat supply network heater sequentially passes through the heat supply network drain pipe and the mixing pipe and is converged into the condensate pipe;
the condensed water pipe comprises a condensed water drainage pump, and the condensed water drainage pump is used for pressurizing the condensed water pipe water mixed with the drained condensed water of the heat supply network heater;
the data acquisition assembly comprises a heating steam extraction pipe pressure sensor and a heating steam extraction pipe temperature sensor which are arranged on the heating steam extraction pipe; the heat supply network drain pipe pressure sensor and the heat supply network drain pipe temperature sensor are arranged on the heat supply network drain pipe; the temperature sensor is arranged on the condensate pipe and is positioned at the upstream of the mixing pipe; the mixed condensate pipe temperature sensor and the mixed condensate pipe pressure sensor are arranged on the condensate pipe and are positioned at the downstream of the mixing pipe;
the data processor is in signal connection with the data acquisition assembly and the condensate drain pump and is used for determining heat supply power data of a heat supply network by using any one of the heat supply capacity measuring methods.
Optionally, in the heating capacity measuring system, the mixing pipe is disposed between two adjacent low-pressure heaters on the condensed water pipe.
Optionally, in the heating capacity measuring system, the mixed condensate pipe temperature sensor is arranged between the mixing pipe and a water inlet of the downstream low-pressure heater;
the data acquisition assembly also comprises a water condensing pipe flow temperature sensor which is arranged at the downstream of the water outlet of the downstream low-pressure heater;
and the data processor determines the flow data of the condensate pipe through the flow temperature data sent by the condensate pipe flow temperature sensor, the condensate pipe drain pump data and the condensate pipe pressure data.
Optionally, in the heating capacity measuring system, the condenser pipe flow temperature sensor is disposed downstream of the condenser pipe pressure sensor.
The heating capacity measuring method provided by the invention comprises the steps of collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensed water pipe temperature data, mixed post-condensed water pipe temperature data, condensed water pipe pressure data and condensed water pipe drain pump data; determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data; determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data; determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data; and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network.
The invention recognizes that the main reason that the heat supply capacity of the heat supply network heater is inaccurate in measurement is that when the pressure of a heat supply network drain pipe suddenly changes, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated. The invention also provides a heating capacity measuring device and system with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a heating capacity measuring method provided by the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a heating capacity measuring apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of a heating capacity measuring system according to the present invention;
fig. 4 is a schematic structural diagram of another embodiment of the heating capacity measuring system provided by the invention.
Detailed Description
The heat supply network heater is a key device of a heat supply network system, is one of main auxiliary devices of a thermal power plant, has a surface heat exchange mode, and has the main function of heating circulating water in a hot water supply system by using extraction steam of a steam turbine or steam (heating medium) introduced from a boiler so as to meet the requirement of a heat supply user.
The operating state of the heat supply network heater is good and bad, which is related to the heat supply quality of residents, so that it is very necessary to master the performance indexes of heat supply capacity, steam side flow, water side flow, heat transfer coefficient, temperature rise, end difference and the like of the heat supply network heater, and especially the heat supply capacity is especially important. The heat supply capacity of the unit is directly related to the heating extraction flow, the heating extraction flow is accurately obtained on the premise of calculating the heat supply capacity, and meanwhile, the monitoring of the heating extraction flow is also important for the operation adjustment of the steam turbine.
The pipe diameters of the steam side and water side pipelines of the heat supply network heater of the large thermal power plant are large, if the pipe diameter of a heating steam extraction pipeline of a 200MW unit is more than phi 800, and for the large pipe diameter, the existing measurement technology cannot measure the steam flow.
The general method for acquiring the heating extraction flow is to add a throttle orifice plate on a drain pipeline of a heat supply network heater, measure the differential pressure value of the throttle orifice plate, and deduce the relation between the flow and the differential pressure according to a Bernoulli equation and a flow continuity equation so as to obtain the drain flow value, wherein the drain flow value is the heating extraction flow.
At present, the existing measurement technology cannot obtain heating extraction flow from the steam side of a heating network heater, is limited by field installation conditions and is influenced by operation, and cannot accurately obtain the heating extraction flow from a drain side. The accuracy of the heating capacity calculation is influenced due to the fact that the obtained heating extraction flow is inaccurate; when the power generation or heat supply load of the unit is adjusted, the operation amount and the operation difficulty of operators are increased.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the present invention is to provide a method for measuring heating capacity, wherein a flow diagram of one embodiment of the method is shown in fig. 1, which is called as a first embodiment of the method, and the method comprises the following steps:
s101: collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensation water pipe temperature data, mixed post-condensation water pipe temperature data, condensation water pipe pressure data and condensation water pipe drainage pump data.
The pressure in the condensate pipe is basically not inconsistent everywhere, so the pressure data before and after mixing are not respectively taken for measuring the pressure in the condensate pipe in the invention, of course, two pressure values before and after mixing can also be taken according to the actual situation, and the invention is not limited herein.
S102: determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; and determining enthalpy data of the heating steam extraction pipe according to the temperature data of the heating steam extraction pipe and the pressure data of the heating steam extraction pipe.
It should be noted that each enthalpy data in this step may be calculated once, or may be divided into multiple steps for separate calculation, and the present invention is not limited herein. The enthalpy data in the present invention can be obtained by referring to the IFC97 lookup table (or other version of the lookup table), or by calculating the IFC formula, but of course, can also be obtained by other methods, and the present application is not limited thereto.
S103: and determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data.
The flow data of the condensate pipe in the step can be obtained by a national standard calculation mode, for example, the calculation is obtained by adopting the formula (1):
wherein C is the efflux coefficient, KmThe constant is Vp, the pressure difference is obtained through the drainage pump data of the condenser pipe, and the rho is the density of the medium in the pipeline (obtained through the calculation of the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe);
further, said KmCalculated by the formula (2) (3):
and D is the diameter of the small hole on the pore plate of the condensate drain pump corresponding to the condensate pipe drain data, D is the diameter of the condensate pipe pipeline, and beta is the diameter ratio of the small hole on the pore plate to the pipeline diameter.
S104: and determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data.
Specifically, this step determines the heat supply network water delivery flow rate m by the following formula (4)1；
Wherein h is enthalpy data of the mixed condenser pipe; h is1Is the heat net hydrophobic enthalpy data; h is2The enthalpy data of the mixed pre-condensation water pipe is obtained; and m is the flow data of the condenser pipe.
In the step, a matrix equation (5) is obtained through a mass balance equation and a heat balance equation in a simultaneous mode, and the water delivery flow of the heat supply network is calculated according to data changes in the condensate pipes before and after the mixing pipe;
wherein m is2The flow data of the mixed condenser pipe can be obtained by measuring or calculating through an instrument.
The formula (4) in the preferred embodiment can be obtained by combining the formula (1) and the formula (5), and the flow rate of the water supplied to the heat supply network can be obtained by calculating by other methods.
S105: and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network.
As a preferred embodiment, the heat supply network heating power data w is determined by the following formula (6);
wherein h iscAnd obtaining enthalpy data of the heating steam extraction pipe.
The unit of the heating power data of the heating network is megawatt, which reflects the external heating capacity of the heating network heater, in other words, the heat absorption of the circulating water of the heating network in the heating network heater is quantized; compared with the prior art that only grass is used for simply evaluating the heat provided by the heat source such as an electric heating plant and the like to the heat exchanger of the heat supply network, the method can directly quantify the heat received by a user, and has more accurate and representative results.
By adopting the preferred embodiment, each algorithm in the whole process has definite physical significance, less original input data, high operation speed and high calculation precision, solves the problem that the flow of the drainage pipe of the heat supply network cannot be accurately measured, and has higher practical value.
The heat supply capacity measuring method provided by the invention comprises the steps of collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condenser pipe temperature data, mixed post-condenser pipe temperature data, condenser pipe pressure data and condenser pipe drainage pump data; determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data; determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data; determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data; and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network. The invention recognizes that the main reason that the heat supply capacity of the heat supply network heater is inaccurate in measurement is that when the pressure of a heat supply network drain pipe suddenly changes, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated.
The following describes a heating capacity measuring device according to an embodiment of the present invention, and the heating capacity measuring device described below and the heating capacity measuring method described above may be referred to in correspondence with each other.
Fig. 2 is a block diagram of a heating capacity measuring device according to an embodiment of the present invention, which is referred to as a second embodiment, and referring to fig. 2, the heating capacity measuring device may include:
the acquisition module 100 is used for acquiring heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condenser pipe temperature data, mixed post-condenser pipe temperature data, condenser pipe pressure data and condenser pipe drain pump data;
the enthalpy calculation module 200 is configured to determine heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data;
the condenser tube flow module 300 is used for determining condenser tube flow data according to the condenser tube drain pump data, the mixed condenser tube temperature data and the condenser tube pressure data;
the water delivery pipe flow module 400 is used for determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed water condensation pipe enthalpy data and the water condensation pipe flow data;
and the heat supply evaluation module 500 is configured to determine heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network, and the hydrophobic flow data of the heat supply network.
As a preferred embodiment, the water delivery pipe flow module 400 includes:
a flow calculation unit for determining the heat supply network water delivery flow m by1；
Wherein h is enthalpy data of the mixed condenser pipe; h is1Is the heat net hydrophobic enthalpy data; h is a total of2The enthalpy data of the mixed pre-condensation water pipe is obtained; and m is the flow data of the condenser pipe.
As a preferred embodiment, the heating evaluation module 500 includes:
the heat supply calculation unit is used for determining heat supply power data w of the heat supply network according to the following formula;
wherein h iscAnd obtaining enthalpy data of the heating steam extraction pipe.
The heat supply capacity measuring device of this embodiment is used for implementing the aforementioned heat supply capacity measuring method, and therefore specific implementations of the heat supply capacity measuring device can be found in the foregoing embodiments of the heat supply capacity measuring method, for example, the collecting module 100, the enthalpy calculating module 200, the condensed water pipe flow module 300, the water pipe flow module 400, and the heat supply evaluating module 500 are respectively used for implementing steps S101, S102, S103, S104, and S105 in the aforementioned heat supply capacity measuring method, so that specific implementations thereof may refer to descriptions of corresponding embodiments of each part, and are not described herein again.
The heating capacity measuring device provided by the invention is used for collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensed water pipe temperature data, mixed post-condensed water pipe temperature data, condensed water pipe pressure data and condensed water pipe drainage pump data through a collecting module 100; the enthalpy calculation module 200 is configured to determine heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data; the condenser tube flow module 300 is used for determining condenser tube flow data according to the condenser tube drain pump data, the mixed condenser tube temperature data and the condenser tube pressure data; the water delivery pipe flow module 400 is used for determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed water condensation pipe enthalpy data and the water condensation pipe flow data; and the heat supply evaluation module 500 is used for determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network. The invention recognizes that the main reason that the heat supply capacity of the heat supply network heater is inaccurate in measurement is that when the pressure of a heat supply network drain pipe suddenly changes, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated.
The invention also provides a heat supply capacity measuring system, the structure schematic diagram of one specific embodiment of which is shown in fig. 3, and is called as a third specific embodiment, and the system comprises a steam turbine 01, a heating steam extraction pipe 02, a heat supply network heater 03, a heat supply network drain pipe 04, a mixing pipe 07, a condensate pipe 05, a data acquisition component and a data processor;
the steam turbine 01 supplies steam to the heat supply network heater 03 through the heating steam extraction pipe 02, and the drainage of the heat supply network heater 03 sequentially passes through the heat supply network drainage pipe 04 and the mixing pipe 07 to be gathered into the condensate pipe 05;
the condensed water pipe 05 comprises a condensed water drain pump 09, and the condensed water drain pump 09 is used for pressurizing the water mixed with the condensed water pipe 05 after being drained by the heat supply network heater 03;
the data acquisition assembly comprises a heating steam extraction pipe pressure sensor 17 and a heating steam extraction pipe temperature sensor 18 which are arranged on the heating steam extraction pipe 02; the heat supply network drain pipe pressure sensor 10 and the heat supply network drain pipe temperature sensor 11 are arranged on the heat supply network drain pipe 04; a mixed pre-condenser temperature sensor 12 disposed in the condenser pipe 05 and upstream of the mixing pipe 07; a mixed condensate pipe temperature sensor 13 and a condensate pipe pressure sensor 16 which are arranged on the condensate pipe 05 and are positioned at the downstream of the mixing pipe 07;
the data processor is in signal connection with the data acquisition assembly and the condensed water drain pump 09 and is used for determining heat supply power data of a heat supply network by using any one of the heat supply capacity measuring methods.
The heating capacity measuring system in the present embodiment corresponds to the heating capacity measuring method in the foregoing, and for details, reference is made to the foregoing, and details are not repeated herein.
In this embodiment, the data collected by each collection component corresponds to each data in the heat supply capacity measurement method in the foregoing, for example, the heating steam extraction pipe pressure sensor 17 corresponds to the heating steam extraction pipe 02 pressure data in the foregoing, and the heating steam extraction pipe temperature sensor 18 corresponds to the heating steam extraction pipe 02 temperature data in the foregoing, and the details are not repeated here.
It should be noted that the condensed water drainage pump 09 is provided with a differential pressure sensor 15, and corresponding differential pressure data can be obtained for relevant calculation.
As a specific embodiment, the mixing pipe 07 is disposed between two adjacent low pressure heaters on the condensate pipe 05, and referring to fig. 4, since the output pressure of the heat supply network drain pipe 04 is similar to the pressure in the condensate pipe 05 between the low pressure heaters in a general thermal power plant, the installation and erection costs can be greatly reduced by directly connecting the two low pressure heaters through the mixing pipe 07, and there is no need to additionally install other pressure isolation devices, which reduces the construction costs. Furthermore, the two low-pressure heaters are respectively a third low-pressure heater and a fourth low-pressure heater.
As a preferred embodiment, the mixed condensed water pipe temperature sensor 13 is arranged between the mixing pipe 07 and the water inlet of the downstream low-pressure heater 08;
the data acquisition assembly further comprises a water condensation pipe flow temperature sensor 14, and the water condensation pipe flow temperature sensor 14 is arranged at the downstream of the water outlet of the downstream low-pressure heater 08;
the data processor determines the flow data of the condensate pipe through the flow temperature data sent by the condensate pipe flow temperature sensor 14, the condensate pipe drain pump data and the condensate pipe pressure data.
The downstream low pressure heater 08 is a low pressure heater located downstream (upstream and downstream in the direction of water flow in the pipe corresponding to the upstream and downstream in the present invention, that is, the direction of water flow is upstream, and the direction of water flow is downstream), that is, a low pressure heater that receives the condensed water mixed by the heat supply network drain pipe 04, of the two low pressure heaters, and the other low pressure heater that receives the condensed water pipe 05 not mixed by the mixing pipe 07 is referred to as an upstream low pressure heater 06.
In the preferred embodiment, the condenser tube flow temperature sensor 14 is additionally provided, because the temperature change of the water in the condenser tube 05 is large before and after passing through the low pressure heater, and the condenser tube flow temperature sensor 14 corresponds to the water flow passing through the two low pressure heaters, so that stable and representative water temperature data can be obtained, the calculation accuracy of the condenser tube flow data is improved, and the accuracy of the finally obtained heat supply power data of the heat supply network is further improved.
Furthermore, the condenser tube flow temperature sensor 14 is disposed downstream of the condenser tube pressure sensor 16, and since the temperature sensor currently used for fluid measurement is required to generate heat during operation, if the condenser tube flow temperature sensor 14 is disposed upstream of the condenser tube pressure sensor 16, the temperature of the water body rises due to external factors, so that an error exists in pressure reading, and therefore, the condenser tube flow temperature sensor 14 is disposed downstream of the condenser tube pressure sensor 16 in the present application, interference of temperature measurement on pressure measurement is avoided, and measurement accuracy is further improved.
The invention provides a heating capacity measuring system, which comprises a steam turbine 01, a heating steam extraction pipe 02, a heat supply network heater 03, a heat supply network drain pipe 04, a mixing pipe 07, a condensate pipe 05, a data acquisition assembly and a data processor; the steam turbine 01 supplies steam to the heat supply network heater 03 through the heating steam extraction pipe 02, and the drainage of the heat supply network heater 03 sequentially passes through the heat supply network drainage pipe 04 and the mixing pipe 07 to be gathered into the condensation water pipe 05; the condensed water pipe 05 comprises a condensed water drain pump 09, and the condensed water drain pump 09 is used for pressurizing the water mixed with the condensed water pipe 05 after being drained by the heat supply network heater 03; the data acquisition assembly comprises a heating steam extraction pipe pressure sensor 17 and a heating steam extraction pipe temperature sensor 18 which are arranged on the heating steam extraction pipe 02; the heat supply network drain pipe pressure sensor 10 and the heat supply network drain pipe temperature sensor 11 are arranged on the heat supply network drain pipe 04; a mixed pre-condenser temperature sensor 12 disposed in the condenser pipe 05 and upstream of the mixing pipe 07; a mixed condensate pipe temperature sensor 13 and a condensate pipe pressure sensor 16 which are arranged on the condensate pipe 05 and are positioned at the downstream of the mixing pipe 07; the data processor is in signal connection with the data acquisition assembly and the condensed water drain pump 09 and is used for determining heat supply power data of a heat supply network by using any one of the heat supply capacity measuring methods. The invention recognizes that the main reason that the heat supply capability of the heat supply network heater 03 is inaccurate in measurement is that when the pressure of the heat supply network drain pipe 04 changes suddenly, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated.
A heating capacity measuring apparatus comprising:
a memory for storing a computer program;
a processor for implementing the steps of the heating capacity measuring method according to any one of the above when executing the computer program. The heating capacity measuring method provided by the invention comprises the steps of collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensed water pipe temperature data, mixed post-condensed water pipe temperature data, condensed water pipe pressure data and condensed water pipe drain pump data; determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining enthalpy data of a heating steam extraction pipe according to the temperature data of the heating steam extraction pipe and the pressure data of the heating steam extraction pipe; determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data; determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data; and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network. The invention recognizes that the main reason that the heat supply capacity of the heat supply network heater is inaccurate in measurement is that when the pressure of a heat supply network drain pipe suddenly changes, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the heating capacity measuring method according to any one of the preceding claims. The heating capacity measuring method provided by the invention comprises the steps of collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensed water pipe temperature data, mixed post-condensed water pipe temperature data, condensed water pipe pressure data and condensed water pipe drain pump data; determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data; determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data; determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data; and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network. The invention recognizes that the main reason that the heat supply capacity of the heat supply network heater is inaccurate in measurement is that when the pressure of a heat supply network drain pipe suddenly changes, the temperature cannot follow the change to increase bubbles in the pipe, a gas-liquid mixture which cannot be accurately calculated is formed, accurate heat supply network water delivery flow data cannot be obtained, and accurate heat supply network heat supply power data cannot be calculated.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device and the system for measuring the heating capacity provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A heating capacity measuring method, characterized by comprising:
collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensation water pipe temperature data, mixed post-condensation water pipe temperature data, condensation water pipe pressure data and condensation water pipe drainage pump data;
determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data;
determining the flow data of the condensate pipe according to the condensate pipe drainage pump data, the mixed condensate pipe temperature data and the condensate pipe pressure data;
determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data;
and determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network.
2. A method as claimed in claim 1, wherein said determining heat supply network hydrophobic flow data from said heat supply network hydrophobic enthalpy data, said post-mixing condensate pipe enthalpy data, said pre-mixing condensate pipe enthalpy data, and said condensate pipe flow data comprises:
determining the heat supply network water delivery flow m by1；
Wherein h is enthalpy data of the mixed condenser pipe; h is1Is the heat net hydrophobic enthalpy data; h is2The enthalpy data of the mixed pre-condensation water pipe is obtained; and m is the flow data of the condensate pipe.
3. A method as claimed in claim 2, wherein said determining heat supply network heating power data from said heating steam extraction enthalpy data, said heat supply network hydrophobic enthalpy data, and said heat supply network hydrophobic flow data comprises:
determining the heating power data w of the heat supply network by the following formula;
wherein h iscAnd obtaining enthalpy data of the heating steam extraction pipe.
4. A heating capacity measuring apparatus, characterized by comprising:
the collection module is used for collecting heat supply network drainage pressure data, heat supply network drainage temperature data, heating steam extraction pipe pressure data, mixed pre-condensation water pipe temperature data, mixed post-condensation water pipe temperature data, condensation water pipe pressure data and condensation water pipe drainage pump data;
the enthalpy calculation module is used for determining heat supply network drainage enthalpy data according to the heat supply network drainage pressure data and the heat supply network drainage temperature data; determining enthalpy data of the mixed condenser pipe according to the temperature data of the mixed condenser pipe and the pressure data of the condenser pipe; determining enthalpy data of the mixed pre-condensation water pipe according to the temperature data of the mixed pre-condensation water pipe and the pressure data of the condensation water pipe; determining heating steam extraction pipe enthalpy data according to the heating steam extraction pipe temperature data and the heating steam extraction pipe pressure data;
the condenser pipe flow module is used for determining condenser pipe flow data according to the condenser pipe drainage pump data, the mixed condenser pipe temperature data and the condenser pipe pressure data;
the water delivery pipe flow module is used for determining heat supply network drainage flow data according to the heat supply network drainage enthalpy data, the mixed condensate pipe enthalpy data, the mixed pre-condensate pipe enthalpy data and the condensate pipe flow data;
and the heat supply evaluation module is used for determining heat supply power data of the heat supply network according to the enthalpy data of the heating steam extraction pipe, the hydrophobic enthalpy data of the heat supply network and the hydrophobic flow data of the heat supply network.
5. A heating capacity measuring apparatus, characterized by comprising:
a memory for storing a computer program;
a processor for implementing the steps of the heating capacity measuring method according to any of claims 1 to 3 when executing the computer program.
6. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the heating capacity measuring method according to any one of claims 1 to 3.
7. A heating capacity measuring system is characterized by comprising a steam turbine, a heating steam extraction pipe, a heating network heater, a heating network drain pipe, a mixing pipe, a condensed water pipe, a data acquisition assembly and a data processor;
the steam turbine supplies steam to the heat supply network heater through the heating steam extraction pipe, and drain water of the heat supply network heater sequentially passes through the heat supply network drain pipe and the mixing pipe and is converged into the condensate pipe;
the condensed water pipe comprises a condensed water drainage pump, and the condensed water drainage pump is used for pressurizing the condensed water pipe water mixed with the drained condensed water of the heat supply network heater;
the data acquisition assembly comprises a heating steam extraction pipe pressure sensor and a heating steam extraction pipe temperature sensor which are arranged on the heating steam extraction pipe; the heat supply network drain pipe pressure sensor and the heat supply network drain pipe temperature sensor are arranged on the heat supply network drain pipe; the temperature sensor is arranged on the condensate pipe and is positioned at the upstream of the mixing pipe; the mixed condensate pipe temperature sensor and the mixed condensate pipe pressure sensor are arranged on the condensate pipe and are positioned at the downstream of the mixing pipe;
the data processor is in signal connection with the data acquisition assembly and the condensate drain pump and is used for determining the heating power data of the heat supply network by the heating capacity measuring method according to any one of claims 1 to 3.
8. A heating capacity measuring system according to claim 7, wherein the mixing pipe is provided between two adjacent low-pressure heaters on the condensate pipe.
9. A heating capacity measuring system according to claim 8, wherein the mixed condenser tube temperature sensor is disposed between the mixing tube and the water inlet of the downstream low pressure heater;
the data acquisition assembly also comprises a water condensing pipe flow temperature sensor which is arranged at the downstream of the water outlet of the downstream low-pressure heater;
and the data processor determines the flow data of the condensate pipe through the flow temperature data sent by the condensate pipe flow temperature sensor, the condensate pipe drain pump data and the condensate pipe pressure data.
10. A heating capacity measuring system according to claim 9, wherein the condenser tube flow temperature sensor is disposed downstream of the condenser tube pressure sensor.
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