CN112700350A - Method and device for calculating coal consumption of heat supply influence power supply of cogeneration unit - Google Patents

Abstract

The application discloses a method, a device and equipment for calculating the influence of heat supply of a cogeneration unit on power supply coal consumption, and a computer readable storage medium, wherein the method comprises the following steps: acquiring the average load, the heat supply mode and the average heat supply flow of the unit within a preset time length; acquiring a target relation corresponding to the unit average load and the heat supply mode from the heat supply influence power supply coal consumption relation, and calculating the heat supply influence power supply coal consumption by using the target relation and the average heat supply flow; the process for establishing the relationship of influencing power supply coal consumption by heat supply in advance comprises the following steps: and calculating the heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary according to the thermal system model with heat supply, and calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary. According to the technical scheme disclosed by the application, the quantitative calculation of the heat supply influence power supply coal consumption is realized by establishing the relationship in advance and obtaining the target relationship from the relationship.

Description

Method and device for calculating coal consumption of heat supply influence power supply of cogeneration unit

Technical Field

The application relates to the technical field of thermal power generation, in particular to a method, a device and equipment for calculating coal consumption of heat supply influence power supply of a cogeneration unit and a computer readable storage medium.

Background

For a thermal power generating unit, the standard coal consumption of power generation and power supply is the first economic index of production and operation of enterprises, the coal consumption of power generation and power supply directly influences the annual operation results of thermal power generating enterprises, and the standard coal consumption of power generation and power supply is the most important index for calculating the annual production cost of the enterprises.

For a cogeneration unit, the total standard coal consumption of the whole plant needs to be divided into the power generation coal consumption and the heat supply coal consumption, and the power supply coal consumption is calculated through the heat supply coal consumption.

In summary, how to implement quantitative calculation on the influence of heat supply on the power supply coal consumption is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present application is to provide a method, an apparatus, a device, and a computer-readable storage medium for calculating coal consumption of heat supply influence power supply of a cogeneration unit, which are used for quantitatively calculating coal consumption of heat supply influence power supply.

In order to achieve the above purpose, the present application provides the following technical solutions:

a method for calculating the influence of heat supply of a cogeneration unit on power supply coal consumption comprises the following steps:

acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time;

acquiring a target relation corresponding to the unit average load and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow;

the process for pre-establishing the relationship of heat supply influence on power supply coal consumption comprises the following steps:

establishing a thermal power system model with heat supply corresponding to the thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and heat supply influence power supply coal consumption corresponding to each heat supply flow; and the influence boundary of the power supply coal consumption comprises unit load and a heat supply mode.

Preferably, calculating the heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and the calculating includes:

calculating the power generation heat consumption rate of the steam turbine under pure condensing working condition under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the power generation heat consumption rate of the steam turbine under heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system;

correspondingly calculating the power generation heat consumption variation caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the pure condensing working condition turbine power generation heat consumption under each power supply coal consumption influence boundary and the heat supply working condition turbine power generation heat consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary;

and correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

Preferably, the calculating the relationship of the coal consumption of heat supply influence corresponding to each coal consumption influence boundary of power supply according to different heat supply flows under each coal consumption influence boundary of power supply and the coal consumption of heat supply influence corresponding to each heat supply flow includes:

calculating the thermoelectric ratio corresponding to each heat supply flow according to each heat supply flow;

and correspondingly calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary and the thermoelectric ratio corresponding to each heat supply flow.

Preferably, the calculating the power generation heat rate of the steam turbine under the pure condensing condition under each type of the power supply coal consumption influence boundary by using the thermal system model with heat supply includes:

calculating the calculation parameters of the power generation heat rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the parameters of the power generation heat rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the calculation parameters

Respectively calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary;

wherein HR is_cThe power generation heat rate of the steam turbine under pure condensing condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of water, P, for reheated steam_gIs the unit load.

Preferably, the calculating, by using the model with the heating thermodynamic system, the power consumption rate of the steam turbine under the heating working condition corresponding to each heating flow under each influence boundary of the power supply coal consumption includes:

calculating the power generation heat consumption rate calculation parameters of the steam turbines under the heat supply working conditions corresponding to the heat supply flow under each power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the power generation heat consumption rate calculation parameters of the steam turbines under the heat supply working conditions corresponding to the heat supply flow under each power supply coal consumption influence boundary by using the heat supply thermal system model

Respectively calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary;

wherein HR is_gSteam turbine generating heat rate for heat supply condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of the reheated steam, E_1oHeat supply for the first heating mode, E_1iSupplementing/returning water heat for the first heating mode, E_noHeat supply for the nth mode of heat supply, E_niFor supplying/returning water heat in the nth heating mode, P_gIs the unit load.

Preferably, the correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow rate under each power supply coal consumption influence boundary according to the power generation heat consumption variation caused by the heat supply corresponding to each heat supply flow rate under each power supply coal consumption influence boundary includes:

by using

Correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary; wherein, Δ b_gThe coal consumption of power supply is influenced by the heat supply corresponding to the heat supply flow, and the delta HR is caused by the heat supply corresponding to the heat supply flowΔ HR ═ HR of the amount of change in heat consumption of power generation_c-HR_g29307.6 is the calorific value of the standard coal, η_glTo the boiler efficiency, η_gdFor pipe efficiency, η_eThe power consumption of the plant.

A heat and power cogeneration unit heat supply influences power supply coal consumption calculating device includes:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit within a preset time;

the calculation module is used for acquiring a target relation corresponding to the unit average load and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow;

the system further comprises an establishing module for establishing a relationship of heat supply influence on power supply coal consumption in advance, wherein the establishing module comprises:

the calculation unit is used for establishing a thermal system model with heat supply corresponding to the thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary, and respectively calculating heat supply influence power supply coal consumption relations corresponding to each power supply coal consumption influence boundary according to the different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow; and the influence boundary of the power supply coal consumption comprises unit load and a heat supply mode.

Preferably, the calculation unit includes:

the first calculating subunit is used for calculating the power generation heat consumption rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each type of heat supply flow under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply;

the second calculating subunit is configured to correspondingly calculate a power generation heat consumption variation amount caused by heat supply corresponding to each heat supply flow rate under each power supply coal consumption influence boundary according to a pure condensing condition turbine power generation heat consumption rate under each power supply coal consumption influence boundary and a heat supply condition turbine power generation heat consumption rate corresponding to each heat supply flow rate under each power supply coal consumption influence boundary;

and the third calculating unit is used for correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

A heat and power cogeneration unit heat supply influences power supply coal consumption calculation equipment includes:

a memory for executing a computer program;

and the processor is used for realizing the steps of the method for calculating the coal consumption of the heat supply influence power supply of the cogeneration unit when the computer program is executed.

A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the steps of the method for calculating the coal consumption for supplying heat and influence of heat by a cogeneration unit as defined in any one of the above.

The application provides a method, a device, equipment and a computer readable storage medium for calculating the influence of heat supply of a cogeneration unit on power supply coal consumption, wherein the method comprises the following steps: acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time; acquiring a target relation corresponding to the average load of the unit and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow; the process for pre-establishing the relationship of heat supply influence on power supply coal consumption comprises the following steps: establishing a thermal power system model with heat supply corresponding to the thermal power unit turbine according to the design working condition of the thermal power unit turbine, calculating heat supply influence power coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating the heat supply influence power coal consumption relation corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power coal consumption corresponding to each heat supply flow; the influence boundary of the power supply coal consumption can comprise unit load and a heating mode.

According to the technical scheme disclosed by the application, a thermal power unit turbine-provided heating thermodynamic system model is established in advance, the thermal power unit turbine-provided heating thermodynamic system model is used for calculating the heating influence power supply coal consumption corresponding to different heating flows under each power supply coal consumption influence boundary, the heating influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary is calculated according to the different heating flows under each power supply coal consumption influence boundary and the heating influence power supply coal consumption corresponding to the different heating flows, namely the relation between the heating flows and the heating influence power supply coal consumption under different unit loads and heating modes is established in advance, then the unit average load, the heating mode and the average heating flow of the thermal power unit within a preset time period can be obtained, and the target relation corresponding to the unit average load and the heating mode of the thermal power unit is obtained from the pre-established heating influence power supply coal consumption relation, and the average heat supply flow is input into the target relation to calculate the corresponding heat supply influence power supply coal consumption, so that the quantitative calculation of the heat supply influence power supply coal consumption is realized, and the guidance effects of checking positive and negative balance coal consumption, optimizing a heat supply operation mode, selecting a heat supply transformation method and the like on the coal-fired cogeneration unit are further facilitated through the calculated heat supply influence power supply coal consumption.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flowchart of a method for calculating coal consumption of heat supply influence power supply of a cogeneration unit according to an embodiment of the present application;

FIG. 2 is a diagram illustrating a relationship between a heat supply flow and a heat supply influence on coal consumption in primary industrial heating according to an embodiment of the present disclosure;

FIG. 3 is a graph showing the relationship between the heat-electricity ratio and the heat supply influence on the coal consumption in primary industrial heat supply according to an embodiment of the present application;

FIG. 4 is a graph illustrating the relationship between the heat flow and the coal consumption of the secondary industrial heating system;

FIG. 5 is a graph showing the relationship between the heat-to-power ratio and the heat supply influence on the coal consumption in secondary industrial heat supply according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a device for calculating a coal consumption of a cogeneration unit due to influence of heat supply on power supply according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a device for calculating a coal consumption of a cogeneration unit due to influence of heat supply on power supply according to an embodiment of the present application.

Detailed Description

For a thermal power generating unit, the standard coal consumption of power generation and power supply is the first economic index of production and operation of enterprises, the coal consumption of power generation and power supply directly influences the annual operation results of thermal power generating enterprises, and the standard coal consumption of power generation and power supply is the most important index for calculating the annual production cost of the enterprises.

Specifically, in the cogeneration unit, the total standard coal consumption of the whole plant needs to be divided into the power generation coal consumption and the heat supply coal consumption, and the power supply coal consumption is calculated through the heat supply coal consumption. According to the DLT904 standard of 'technical and economic index calculation method of thermal power plant', the heat supply coal consumption is only related to boiler efficiency and pipeline efficiency but not to the grade of supplied steam by a sharing method of 'benefit return to power', and the sharing method causes the coal consumption of power generation and power supply after heat supply of a unit is greatly reduced. At present, the influence of heat supply on the coal consumption of unit power supply is lack of quantitative research, and the energy-saving professional of a power plant is lack of credible technical support when positive and negative balance coal consumption cores work equivalently.

Therefore, the method and the device for calculating the coal consumption of heat supply influence power supply of the cogeneration unit are provided, and are used for realizing quantitative calculation of the coal consumption of heat supply influence power supply.

In order to make the technical solutions more clearly understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

Referring to fig. 1, which shows a flowchart of a method for calculating coal consumption of heat supply impact on power supply of a cogeneration unit according to an embodiment of the present application, a method for calculating coal consumption of heat supply impact on power supply of a cogeneration unit according to an embodiment of the present application may include:

s11: establishing a thermal system model with heat supply corresponding to a thermal power unit turbine, and calculating heat supply influence power coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal system model with heat supply; the influence boundary of the power supply coal consumption comprises unit load and a heat supply mode.

It should be noted that, in the present application, the "coal consumption of power supply influenced by heat supply" refers to the amount of change (generally, reduction) in coal consumption of power supply of the thermal power generating unit caused by heat supply after the benefit distribution method of "benefit return to power" is adopted, so as to facilitate comparative analysis. In addition, for heat supply, factors such as extraction steam (cold re, hot re, four extraction, five extraction and the like) and drainage/return water positions, pressure of externally supplied steam, temperature and the like (namely, factors corresponding to heat supply modes) of the steam turbine directly influence the reduction degree of the coal consumption of the unit for power supply, and analysis shows that after the steam turbine is subjected to heat supply transformation, the heat supply modes of the thermal power unit, namely the heat supply extraction steam and the drainage/return water positions are basically determined, each heat supply mode approximately corresponds to an external heat supply level, the external steam supply pressure of the level is basically kept unchanged, in addition, most users have low requirements on heat supply temperature, and the heat supply temperature is generally micro-superheated steam. In the actual steam supply process, the heat demand of the thermal power plant is generally divided into a plurality of grades such as high pressure, medium pressure, heating and the like, and the heat supply mode of each grade for heat supply under the normal operation load is basically determined. In addition, the load of the unit can also influence the coal consumption of the power supply through heat supply, and the heat supply flow can also influence the coal consumption of the power supply through heat supply.

According to the process, the heat supply mode, the unit load and the heat supply flow of the thermal power generating unit are main factors influencing coal consumption in the actual heat supply process, and the traditional analysis methods such as equivalent enthalpy reduction are not applicable due to more variable dimensions.

Specifically, a simulation software can be established based on a computer thermal system, a model with a heat supply thermodynamic system can be established according to the design working condition of a turbine of a thermal power unit in a specific thermal power plant, or the model with the heat supply thermodynamic system can be established according to measured data obtained by performing a performance test on the turbine of the thermal power unit, wherein the design working condition of the turbine of the thermal power unit can be obtained from a heat balance diagram provided by a turbine manufacturer, and the steam extraction and drainage/return positions, the external steam supply pressure and the external steam supply temperature of the established model with the heat supply thermodynamic system are the same as the actual heat supply condition of the thermal power unit.

After the model of the thermal system with heat supply is obtained, the model of the thermal system with heat supply can be established to calculate the coal consumption of the heat supply influence corresponding to different heat supply flows under each coal consumption influence boundary with heat supply, wherein the coal consumption influence boundary with power supply comprises unit load and heat supply mode, and the coal consumption influence boundary with power supply can be various and each coal consumption influence boundary with power supply corresponds to a plurality of different heat supply flows.

S12: and respectively calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow.

On the basis of obtaining the heat supply influence power supply coal consumption corresponding to different heat supply flows under the power supply coal consumption influence boundary through calculation, the heat supply influence power supply coal consumption relation corresponding to the power supply coal consumption influence boundary can be correspondingly calculated according to the different heat supply flows under the power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow.

And respectively obtaining the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary by correspondingly calculating each power supply coal consumption influence boundary. It should be noted that, step S12 and step S11 may be performed simultaneously, that is, after calculating the heat supply impact power coal consumption corresponding to different heat supply flows under one power supply coal consumption impact boundary, the heat supply impact power coal consumption relationship corresponding to the power supply coal consumption impact boundary may be calculated according to the different heat supply flows under the power supply coal consumption impact boundary and the heat supply impact power coal consumption corresponding to each heat supply flow, or step S12 may be performed after step S11, that is, after calculating the heat supply impact power coal consumption corresponding to different heat supply flows under each power supply coal consumption impact boundary through step S11, the heat supply impact power coal consumption relationship corresponding to each power supply coal consumption impact boundary is calculated according to the different heat supply flows under each power supply coal consumption impact boundary and the heat supply impact power coal consumption corresponding to each heat supply flow.

Through the above steps S11 and S12, the heat supply influence power coal consumption relationship corresponding to each of the multiple power supply coal consumption influence boundaries can be obtained, and the heat supply influence power coal consumption relationship mentioned in the present application may be specifically in the form of a relational expression or in the form of a curve, which is not limited in this application.

In addition, it should be noted that, what is realized by steps S11 and S12 is a process of establishing a relationship between heat supply influence and power consumption in advance, and this process may be performed only once when the thermal power generating unit is determined in practical application.

S13: and acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time.

On the basis of pre-establishing a relationship that heat supply influences power supply coal consumption, when the power supply coal consumption of the thermal power generating unit needs to be calculated, the average load of the thermal power generating unit, the heat supply mode and the corresponding average heat supply flow within a preset time period can be obtained. The preset time period may be specifically 1 day or one month, and may be specifically set according to the operation performance of the thermal power generating unit.

S14: and acquiring a target relation corresponding to the average load of the unit and the heat supply mode from the pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow.

After the unit average load, the heat supply mode, and the average heat supply flow rate of the thermal power unit are obtained, a target relationship corresponding to the unit average load and the heat supply mode of the thermal power unit within a preset time period may be obtained from the heat supply influence power supply coal consumption relationship pre-established based on steps S11 and S12, and then, the heat supply influence power supply coal consumption corresponding to the unit average load, the heat supply mode, and the average heat supply flow rate of the thermal power unit within the preset time period may be calculated according to the target relationship and the average heat supply flow rate corresponding to the unit average load and the heat supply mode of the thermal power unit within the preset time period.

According to the technical scheme disclosed by the application, a thermal power unit turbine-provided heating thermodynamic system model is established in advance, the thermal power unit turbine-provided heating thermodynamic system model is used for calculating the heating influence power supply coal consumption corresponding to different heating flows under each power supply coal consumption influence boundary, the heating influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary is calculated according to the different heating flows under each power supply coal consumption influence boundary and the heating influence power supply coal consumption corresponding to the different heating flows, namely the relation between the heating flows and the heating influence power supply coal consumption under different unit loads and heating modes is established in advance, then the unit average load, the heating mode and the average heating flow of the thermal power unit within a preset time period can be obtained, and the target relation corresponding to the unit average load and the heating mode of the thermal power unit is obtained from the pre-established heating influence power supply coal consumption relation, and the average heat supply flow is input into the target relation to calculate the corresponding heat supply influence power supply coal consumption, so that the quantitative calculation of the heat supply influence power supply coal consumption is realized, and the guidance effects of checking positive and negative balance coal consumption, optimizing a heat supply operation mode, selecting a heat supply transformation method and the like on the coal-fired cogeneration unit are further facilitated through the calculated heat supply influence power supply coal consumption.

The method for calculating the coal consumption of heat supply influence power supply of the cogeneration unit provided by the embodiment of the application utilizes a model with a heat supply thermodynamic system to calculate the coal consumption of heat supply influence power supply corresponding to different heat supply flows under each coal consumption influence boundary of power supply, and can comprise the following steps:

calculating the power generation heat consumption rate of the steam turbine under the pure condensing working condition under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system;

correspondingly calculating the power generation heat consumption variation caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the pure condensing working condition steam turbine power generation heat consumption rate under each power supply coal consumption influence boundary and the heat supply working condition steam turbine power generation heat consumption rate corresponding to each heat supply flow under each power supply coal consumption influence boundary;

and correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

When the heat supply influence power coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary is calculated by using the model with the heat supply thermodynamic system, the power generation heat consumption rate of the steam turbine under the pure condensing working condition under each power supply coal consumption influence boundary can be respectively calculated by using the established model with the heat supply thermodynamic system, wherein the power generation heat consumption rate of the steam turbine under the pure condensing working condition is only related to the load of a unit, so that each power supply coal consumption influence boundary only needs to calculate the power generation heat consumption rate of the steam turbine under the pure condensing working condition correspondingly, and for the condition that the unit loads are the same under different power supply coal consumption influence boundaries, the power generation heat consumption rate of the steam turbine under the pure condensing working condition can be only calculated once, so as to reduce the calculation times of the power generation heat consumption rate of the steam turbine under the pure condensing working condition and reduce the occupation of calculation resources, of course, each power supply coal consumption influence boundary can also carry out the power generation heat consumption rate calculation, this is not a limitation of the present application. In addition, the heat supply condition turbine power generation heat consumption rate corresponding to each heat supply flow under each power supply coal consumption influence boundary can be calculated by using the heat supply thermal system model, namely for each power supply coal consumption influence boundary, the heat supply condition turbine power generation heat consumption rate corresponding to different heat supply flows under the power supply coal consumption influence boundary is calculated by using the heat supply thermal system model. That is, the method and the device can utilize the established model with the heat supply thermodynamic system to perform variable working condition simulation calculation so as to respectively obtain the pure condensing working condition steam turbine power generation heat consumption rate under the influence boundary of the power supply coal consumption and the heat supply working condition steam turbine power generation heat consumption rate corresponding to each heat supply flow under the influence boundary of the power supply coal consumption.

On the basis of the calculation, according to the pure condensing condition turbine power generation heat consumption rate under each power supply coal consumption influence boundary and the heat supply condition turbine power generation heat consumption rate corresponding to each heat supply flow under each power supply coal consumption influence boundary, the amount of change in power generation heat consumption (heat supply influence power generation heat consumption) due to heat supply corresponding to each heat supply flow rate under each power supply coal consumption influence boundary is calculated correspondingly, specifically, for each heat supply flow under each kind of power supply coal consumption influence boundary, the power generation heat consumption of the steam turbine under the heat supply working condition corresponding to the heat supply flow can be subtracted from the power generation heat consumption rate of the steam turbine under the pure condensing working condition corresponding to the heat supply flow so as to obtain the power generation heat consumption variable quantity caused by the heat supply corresponding to the heat supply flow, and then, according to the power generation heat consumption variation caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary, and correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary.

It should be noted that the above-mentioned heat supply influencing coal consumption corresponding to each heat supply flow under various power supply coal consumption influencing boundaries may be performed simultaneously, or after the calculation of the heat supply influencing coal consumption corresponding to each heat supply flow under one power supply coal consumption influencing boundary is completed, the heat supply influencing coal consumption corresponding to each heat supply flow under another power supply coal consumption influencing boundary is calculated until the calculation of the heat supply influencing coal consumption corresponding to each heat supply flow under each power supply coal consumption influencing boundary is completed.

According to the method for calculating the heat supply influence power supply coal consumption of the cogeneration unit, the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary is calculated respectively according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow, and the method can comprise the following steps:

calculating the thermoelectric ratio corresponding to each heat supply flow according to each heat supply flow;

and correspondingly calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary and the thermoelectric ratio corresponding to each heat supply flow.

When the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary is respectively calculated according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow, the heat-electricity ratio corresponding to each heat supply flow can be calculated according to different heat supply flows under each power supply coal consumption influence boundary, and the specific application can be

Calculating the thermoelectric ratio corresponding to each heat supply flow, wherein Q is the heat supply flow, h_oSupplying heat steam/hot water enthalpy in kJ/kg for the current heat supply mode corresponding to the influence boundary of power supply coal consumption; h is_iThe unit of the heat supply drainage/water supplement enthalpy is kJ/kg and P under the current heat supply mode corresponding to the influence boundary of the power supply coal consumption_gInfluencing the current unit load, η, corresponding to the boundary for the coal consumption of the power supply_eFor plant power usage,%, 3600 is the conversion of hours and seconds.

After calculating the thermoelectric ratio corresponding to each heat supply flow, the heat supply influence power supply coal consumption relationship corresponding to each power supply coal consumption influence boundary can be correspondingly calculated according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary and the thermoelectric ratio corresponding to each heat supply flow. Of course, the relationship of the heat supply influence power supply coal consumption corresponding to each power supply coal consumption influence boundary may also be directly and correspondingly calculated according to each heat supply flow under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow.

Specifically, for each kind of power supply coal consumption influence boundary, a heat supply influence power supply coal consumption relation curve between the heat supply flow rate or the thermoelectric ratio corresponding to the heat supply flow rate and the heat supply influence power supply coal consumption corresponding to the heat supply flow rate under the power supply coal consumption influence boundary may be drawn, and within a certain heat supply flow rate variation range, the heat supply influence power supply coal consumption relation curve may be approximated to a straight line, so that the following relation may be obtained by relation fitting: Δ b_g＝a₁×Q-b₁＝a₂×R-b₂Wherein, Δ b_gThe unit of Q is the heat supply flow under the current heat supply mode corresponding to the influence boundary of the power supply coal consumption, the unit is t/h, R is the thermoelectric ratio,%, a₁As heat supply influence coefficient (heat supply flow rate), b₁To throttle the deviation (heat supply flow rate), a₂As heat supply influence coefficient (thermoelectric ratio), b₂The heat supply influence coefficient is larger, which indicates that the steam extraction economy is better to a certain extent, and the throttle deviation b₁"the change of the coal consumption of the power supply of the unit is reduced due to the throttling of the middle adjusting door, the rotary clapboard, the middle row butterfly valve and the like in the description.

The method for calculating the coal consumption of the heat supply influence power supply of the cogeneration unit, provided by the embodiment of the application, is used for calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each coal consumption influence boundary of the power supply by using the model with the heat supply thermodynamic system, and can comprise the following steps of:

calculating the calculation parameters of the steam turbine power generation heat consumption rate under the pure condensing working condition under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the parameters of the steam turbine power generation heat consumption rate under the pure condensing working condition under each power supply coal consumption influence boundary by using the calculation parameters

Respectively calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary;

wherein HR is_cThe power generation heat rate of the steam turbine under pure condensing condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of water, P, for reheated steam_gIs the unit load.

When the heat supply thermodynamic system model is used for calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary, the heat supply thermodynamic system model can be used for calculating the power generation heat consumption rate calculation parameter (specifically, the calculation parameter is W used in the calculation formula) of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary_msEqual parameters) and calculating the parameter utilization according to the pure condensing condition steam turbine power generation heat consumption rate under each power supply coal consumption influence boundary

Respectively calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary, wherein the HR is the power supply energy consumption rate_cThe unit of the heat consumption rate of the steam turbine under pure condensing condition is kJ/kWh and W_msIs the main steam flow with the unit of t/h, h_msIs the main enthalpy of steam, with the unit of kJ/kg, h_fwThe final enthalpy of feed water is expressed in kJ/kg, W_hrIs the flow rate of the hot reheat steam, and has the unit of t/h, W_rhIs the reheat steam temperature reduction water flow with the unit of t/h, h_hrIs the enthalpy of hot reheat steam, and has the unit of kJ/kg, h_crIs the enthalpy of cold reheat steam, and has the unit of kJ/kg, W_rhIs the reheat steam temperature reduction water flow with the unit of t/h, h_rhIs the enthalpy of the reheated steam desuperheating water, and the unit is kJ/kg, P_gUnit load is in MW.

The method for calculating the coal consumption of the heat supply influence power supply of the cogeneration unit, provided by the embodiment of the application, is used for calculating the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each coal consumption influence boundary of the heat supply by using the model with the heat supply thermodynamic system, and can comprise the following steps of:

calculating the heat consumption rate calculation parameters of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the parameters of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the heat consumption rate calculation parameters

Respectively calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary;

wherein HR is_gSteam turbine generating heat rate for heat supply condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of the reheated steam, E_1oHeat supply for the first heating mode, E_1iSupplementing/returning water heat for the first heating mode, E_noHeat supply for the nth mode of heat supply, E_niFor supplying/returning water heat in the nth heating mode, P_gIs the unit load.

When the thermal system model with heat supply is used for calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary, the thermal system model with heat supply can be used for calculating the power consumption rate calculation parameter (specifically, the power consumption rate calculation parameter is W used in the calculation formula) of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary_msEqual parameters) and calculating the utilization of the parameters according to the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary

Respectively calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary, wherein the HR is the power consumption rate of the steam turbine under the heat supply working condition_gThe unit of the power generation heat consumption rate of the steam turbine is kJ/kWh and W under the working condition of heat supply_msIs the main steam flow with the unit of t/h, h_msIs the main enthalpy of steam, with the unit of kJ/kg, h_fwThe final enthalpy of feed water is expressed in kJ/kg, W_hrIs the flow rate of hot reheat steam, and has a unit of W_rhIs the reheat steam temperature reduction water flow with the unit of t/h, h_hrIs the enthalpy of hot reheat steam, and has the unit of kJ/kg, h_crIs the enthalpy of cold reheat steam, and has the unit of kJ/kg, W_rhIs the reheat steam temperature reduction water flow with the unit of t/h, h_rhIs the enthalpy of the reheated steam desuperheating water with the unit of kJ/kg and E_1oHeat is supplied for the first heating mode, and the unit is MJ/h, E_1iThe heat quantity of the water is supplemented/returned for the first heat supply mode, and the unit is MJ/h and E_noHeat quantity for the nth heating mode is MJ/h, E_niSupplementing/returning water heat for the nth heat supply mode in units of MJ/h and P_gUnit load is in MW.

The embodiment of the application provides a method for calculating coal consumption of heat supply influence power supply of a cogeneration unit, which correspondingly calculates the coal consumption of heat supply influence power supply corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the generated heat consumption variable quantity caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary, and comprises the following steps:

by using

Correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary; wherein, Δ b_gThe heat supply corresponding to the heat supply flow affects the coal consumption of power supply, the delta HR is the variation of the power generation heat consumption caused by the heat supply corresponding to the heat supply flow, and the delta HR is the HR_c-HR_g29307.6 is the calorific value of the standard coal, η_glTo the boiler efficiency, η_gdFor pipe efficiency, η_eThe power consumption of the plant.

The pure condensing working condition steam turbine power generation heat consumption rate HR under each power supply coal consumption influence boundary is obtained through calculation_cAnd the power generation heat consumption rate HR of the steam turbine under each heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary_gThen, Δ HR ═ HR may be used respectively_c-HR_gCalculating the power generation heat consumption variation delta HR caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary, and then utilizing

Correspondingly calculating the heat supply influence power supply coal consumption delta b corresponding to each heat supply flow under each power supply coal consumption influence boundary_gThe unit is g/kWh, 29307.6 is the calorific value of the standard coal, the unit is kJ/kg, eta_glIs boiler efficiency in%, η_gdIn terms of pipe efficiency,% eta_eThe unit is the power consumption rate of the plant.

It should be noted that, in the above process, the calculation of the heat supply influence power supply coal consumption relationship corresponding to each power supply coal consumption influence boundary may be performed simultaneously or sequentially, and when the calculation is performed sequentially, the following method may be specifically adopted to implement:

step 1: acquiring unit load and a current heat supply mode, changing heat supply flow under the heat supply mode, and calculating the power generation heat rate of a steam turbine under a pure condensation working condition under the unit load by using a thermal system model with heat supply:

calculating the power generation heat consumption rate of a steam turbine under the heat supply working condition corresponding to each heat supply flow under the unit load and the current heat supply mode by using a model with a heat supply thermodynamic system:

step 2: according to the power generation heat consumption rate of the steam turbine under the pure condensing working condition under the unit load and the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under the unit load and the current heat supply mode, utilizing delta HR (equal to HR)_c-HR_gRespectively and correspondingly calculating the power generation heat consumption variable quantity (the power generation heat consumption is influenced by heat supply) caused by heat supply corresponding to each heat supply flow;

and step 3: utilizing the variation of power generation heat consumption caused by heat supply corresponding to each heat supply flow

Respectively calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow;

and 4, step 4: drawing a heat supply influence power supply coal consumption relation curve between the heat supply flow or the thermoelectric ratio corresponding to the heat supply flow and the heat supply influence power supply coal consumption under the unit load and the heat supply mode, wherein the heat supply influence power supply coal consumption relation curve can be approximated to a straight line within a certain heat supply flow variation range, so that the following relation can be obtained through relation fitting: Δ b_g＝a₁×Q-b₁＝a₂×R-b₂；

And 5: changing the unit load, taking the changed unit load as a new unit load, and returning to execute the steps 1 to 5 until the calculation of all the unit loads is completed; all the unit loads mentioned above may be a plurality of unit loads divided according to the unit load conditions of the thermal power generating unit.

Step 6: and (3) changing the current heat supply mode, taking the changed current heat supply mode as a new heat supply mode, and returning to execute the steps 1 to 6 until the calculation of each power supply mode in the thermal power generating unit is completed.

Of course, the calculation sequence of the unit load and the heating mode can be changed.

For more detailed description of the present application, a steam turbine of a 2 × 350MW unit of a certain power plant is taken as an example of a supercritical, single-intermediate reheating, single-shaft, three-cylinder two-steam-exhaust, double-steam-extraction segment type heat supply type and wet-condensing steam turbine, wherein the steam turbine is provided with two heat supply modes with different parameter levels, specifically, the method is divided into a first-stage industrial heat supply mode and a second-stage industrial heat supply mode, wherein the first-stage industrial heat supply mode adopts a mode of directly supplying steam to the outside after cold and heat are remixed, the steam supply pressure is 3.8mpa, the heat supply flow fluctuates in the range of 20-60t/h, the step length is calculated by 20t/h, the steam extraction source of the second-stage industrial heat supply mode is 3-stage steam extraction of the steam turbine, the steam is supplied after water is sprayed to reduce the temperature, the flow is controlled by the opening of three industrial steam extraction seat cylinder valves at the upper part of a medium-pressure outer cylinder, the steam supply pressure is 2., the step size is calculated as 50 t/h.

And establishing a model with a heat supply thermodynamic system according to the thermal balance diagram of the steam turbine of the power plant and the actual steam supply configuration of the unit. And the systems of heat regeneration and the like of the model are all set according to the actual condition of the unit.

Model boundary conditions: the back pressure of the unit is 5.3 kPa; supplying heat and water to the condenser, wherein the water supplementing temperature is 20 ℃.

The normal operation load interval of the unit is 240-300MW, and the calculation step length is 30 MW.

The quantitative calculation result of the coal consumption of the unit power supply influenced by heat supply in the first-level industrial heat supply mode is shown in the following table:

TABLE 1 parameter table of coal consumption of heat supply influencing unit in first-level industrial heat supply mode

According to the calculation result, drawing a normal operation load interval of the unit, specifically referring to fig. 2 and fig. 3 for a relation between a primary industrial heat supply flow/heat power ratio and a power supply coal consumption change, wherein fig. 2 is a relation graph between a heat supply flow and a heat supply influence power supply coal consumption in primary industrial heat supply, fig. 3 is a relation graph between a heat power ratio and a heat supply influence power supply coal consumption in primary industrial heat supply, an abscissa in fig. 2 is a heat supply flow (t/h), an ordinate is a heat supply influence power supply coal consumption reduction value (g/kWh), (the value is negative, the power supply coal consumption is increased), an abscissa in fig. 3 is a heat power ratio (%), and an ordinate is a heat supply influence power supply coal consumption reduction value (g/kWh).

Fitting the relation curve to obtain a unitary linear function, taking the curve that the steam supply flow influences the coal consumption under 270MW load as an example: the power supply coal consumption reduction value is 0.1408 (the heat supply flow rate is-2.8397 (g/kWh), and the relation formula shows that the power supply coal consumption of the unit is reduced by about 0.1408g/kWh when the heat supply influence coefficient is 01408 and the throttling deviation is 2.8397 and the heat supply flow rate is changed by 1t/h under 270MW load, but the total influence quantity is also reduced by 2.8397g/kWh due to the influence of the throttling of the regulating gate in the unit.

The quantitative calculation result of the coal consumption of the unit power supply influenced by heat supply in the secondary industrial heat supply mode is shown in the following table:

TABLE 2 coal consumption parameter table for heat supply influencing unit in two-stage industrial heat supply mode

Specifically, referring to fig. 4 and 5, drawing a relationship between the flow rate of the secondary industrial steam supply and the coal consumption of the heat supply influence according to the simulation calculation result, wherein fig. 4 is a relationship diagram between the heat supply flow rate and the coal consumption of the heat supply influence in the secondary industrial heat supply, fig. 5 is a relationship diagram between the heat ratio and the coal consumption of the heat supply influence in the secondary industrial heat supply, the abscissa in fig. 4 is the heat supply flow rate (t/h), the ordinate is the reduction value (g/kWh) of the coal consumption of the heat supply influence on the power supply, (the value is negative, the increase of the coal consumption of the power supply is illustrated), the abscissa in fig. 5 is the heat ratio (%), and the ordinate is the reduction value (g/kWh) of the coal consumption of the heat supply influence on the power supply.

Taking the operating data of the project #1 machine in 2020 and 1 month as an example: the average electric load of the #1 unit is about 281MW, and the power supply coal consumption of the unit is 319.96g/kWh under the pure condensation working condition through a consumption difference analysis method. The primary level and the secondary level are respectively 33.2t/h and 154.6t/h, and the coal consumption coefficient and the throttling deviation are calculated through respective heat supply influence, so that the coal consumption of the unit for power supply is respectively influenced by 2.44g/kWh and 14.58g/kWh, and the total coal consumption of the unit for power supply is influenced by 17.02 g/kWh. The actual power supply coal consumption of the lunar unit is 319.96-17.02 which is 302.94 g/kWh.

The embodiment of the present application further provides a device for calculating coal consumption of heat supply influence on power supply of a cogeneration unit, refer to fig. 6, which shows a schematic structural diagram of the device for calculating coal consumption of heat supply influence on power supply of a cogeneration unit, and the device may include:

the acquiring module 62 is configured to acquire an average unit load, a heat supply mode and an average heat supply flow of the thermal power unit within a preset time period;

the calculation module 63 is configured to obtain a target relationship corresponding to the unit average load and the heat supply mode from a pre-established heat supply influence power supply coal consumption relationship, and calculate the corresponding heat supply influence power supply coal consumption by using the target relationship and the average heat supply flow;

the method further includes an establishing module 61 for establishing a relationship between heat supply influence and power supply coal consumption in advance, where the establishing module 61 may include:

the calculation unit is used for establishing a thermal power system model with heat supply corresponding to a thermal power unit turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating heat supply influence power supply coal consumption relations corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow; the influence boundary of the power supply coal consumption can comprise unit load and a heating mode.

The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculating device, the calculating unit can include:

the first calculating subunit is used for calculating the power generation heat consumption rate of the steam turbine under the pure condensing working condition under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system;

the second calculating subunit is used for correspondingly calculating the power generation heat consumption variation caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the pure condensing working condition steam turbine power generation heat consumption under each power supply coal consumption influence boundary and the heat supply working condition steam turbine power generation heat consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary;

and the third calculating unit is used for correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculating means, the calculating means can also include:

the fourth calculating unit is used for calculating the thermoelectric ratio corresponding to each heat supply flow according to each heat supply flow;

and the fifth calculating unit is used for correspondingly calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary and the thermoelectric ratio corresponding to each heat supply flow.

The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculation device, first calculation subelement can include:

a first power generation heat consumption calculation unit for calculating the power generation heat consumption rate calculation parameters of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary by using the thermal system model with heat supply, and utilizing the power generation heat consumption rate calculation parameters of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary

Respectively calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary;

wherein HR is_cThe power generation heat rate of the steam turbine under pure condensing condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhFor reheating steam desuperheating waterEnthalpy, P_gIs the unit load.

The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculation device, first calculation subelement can include:

a second power generation heat consumption calculation unit for calculating power generation heat consumption rate calculation parameters of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermal system, and calculating power generation heat consumption rate calculation parameters of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using

Respectively calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary;

wherein HR is_gSteam turbine generating heat rate for heat supply condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of the reheated steam, E_1oHeat supply for the first heating mode, E_1iSupplementing/returning water heat for the first heating mode, E_noHeat supply for the nth mode of heat supply, E_niFor supplying/returning water heat in the nth heating mode, P_gIs the unit load.

The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption computational device, third computational element can include:

a heat supply influence power supply coal consumption calculation unit for utilizing

Correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary; wherein, Δ b_gInfluencing the coal consumption, Delta, for the heating corresponding to the heating flowHR is a change amount of power generation heat consumption due to heat supply corresponding to the heat supply flow rate, and Δ HR ═ HR_c-HR_g29307.6 is the calorific value of the standard coal, η_glTo the boiler efficiency, η_gdFor pipe efficiency, η_eThe power consumption of the plant.

The embodiment of the present application further provides a device for calculating coal consumption of heat supply influence on power supply of a cogeneration unit, referring to fig. 7, which shows a schematic structural diagram of a device for calculating coal consumption of heat supply influence on power supply of a cogeneration unit, provided by the embodiment of the present application, and the device may include:

a memory 71 for executing a computer program;

the processor 72, when executing the computer program stored in the memory 71, may implement the following steps:

acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time; acquiring a target relation corresponding to the average load of the unit and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow; the process for pre-establishing the relationship of heat supply influence on power supply coal consumption comprises the following steps: establishing a thermal power system model with heat supply corresponding to a thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating heat supply influence power supply coal consumption relations corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow; the influence boundary of the power supply coal consumption can comprise unit load and a heating mode.

An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the following steps may be implemented:

acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time; acquiring a target relation corresponding to the average load of the unit and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow; the process for pre-establishing the relationship of heat supply influence on power supply coal consumption comprises the following steps: establishing a thermal power system model with heat supply corresponding to a thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating heat supply influence power supply coal consumption relations corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow; the influence boundary of the power supply coal consumption can comprise unit load and a heating mode.

The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

For a description of relevant parts in the device and equipment for calculating the coal consumption for influencing power supply by heat supply of the cogeneration unit and the computer-readable storage medium provided by the embodiment of the present application, reference may be made to detailed descriptions of corresponding parts in the method for calculating the coal consumption for influencing power supply by heat supply of the cogeneration unit provided by the embodiment of the present application, and details are not repeated here.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, 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 elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for calculating the influence of heat supply of a cogeneration unit on power supply coal consumption is characterized by comprising the following steps:

acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit in a preset time;

acquiring a target relation corresponding to the unit average load and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow;

the process for pre-establishing the relationship of heat supply influence on power supply coal consumption comprises the following steps:

establishing a thermal power system model with heat supply corresponding to the thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary by using the thermal power system model with heat supply, and respectively calculating heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to different heat supply flows under each power supply coal consumption influence boundary and heat supply influence power supply coal consumption corresponding to each heat supply flow; and the influence boundary of the power supply coal consumption comprises unit load and a heat supply mode.

2. The method for calculating the coal consumption of heat supply influence and power supply of the cogeneration unit according to claim 1, wherein calculating the coal consumption of heat supply influence and power supply corresponding to different heat supply flows under each coal consumption influence boundary by using the model with the heat supply thermodynamic system comprises:

calculating the power generation heat consumption rate of the steam turbine under pure condensing working condition under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system, and calculating the power generation heat consumption rate of the steam turbine under heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary by using the model with the heat supply thermodynamic system;

correspondingly calculating the power generation heat consumption variation caused by heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the pure condensing working condition turbine power generation heat consumption under each power supply coal consumption influence boundary and the heat supply working condition turbine power generation heat consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary;

and correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

3. The method for calculating the coal consumption of heat supply influence and power supply of the cogeneration unit according to claim 2, wherein calculating the coal consumption relationship of heat supply influence and power supply corresponding to each coal consumption influence boundary according to different heat supply flows under each coal consumption influence boundary and the coal consumption of heat supply influence and power supply corresponding to each heat supply flow comprises:

calculating the thermoelectric ratio corresponding to each heat supply flow according to each heat supply flow;

and correspondingly calculating the heat supply influence power supply coal consumption relation corresponding to each power supply coal consumption influence boundary according to the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary and the thermoelectric ratio corresponding to each heat supply flow.

4. The method for calculating the coal consumption of heat supply influence power supply of the cogeneration unit according to claim 2, wherein calculating the power generation heat consumption rate of the steam turbine under the pure condensation condition on each type of the coal consumption influence boundary of the power supply by using the model of the thermal system with heat supply comprises the following steps:

calculating the calculation parameters of the power generation heat rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the parameters of the power generation heat rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the calculation parameters

Respectively calculating the power generation heat consumption rate of the steam turbine under the pure condensation working condition under each power supply coal consumption influence boundary;

wherein HR is_cThe power generation heat rate of the steam turbine under pure condensing condition, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of water, P, for reheated steam_gIs the unit load.

5. The method for calculating influence on power supply coal consumption by heat and power cogeneration unit in heating according to claim 4, wherein calculating the power consumption rate of the steam turbine under the heating working condition corresponding to each heating flow under each influence boundary of power supply coal consumption by using the model with the heating thermodynamic system comprises:

calculating the power generation heat consumption rate calculation parameters of the steam turbines under the heat supply working conditions corresponding to the heat supply flow under each power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the power generation heat consumption rate calculation parameters of the steam turbines under the heat supply working conditions corresponding to the heat supply flow under each power supply coal consumption influence boundary by using the heat supply thermal system model

Respectively calculating the power consumption rate of the steam turbine under the heat supply working condition corresponding to each heat supply flow under each power supply coal consumption influence boundary;

wherein HR is_gSteam turbine generator for heat supply working conditionRate of electric heat consumption, W_msMain steam flow, h_msIs the main steam enthalpy, h_fwFor the final feed water enthalpy, W_hrFor hot reheat steam flow, W_rhFor reducing the temperature and water flow of reheated steam, h_hrIs the enthalpy of hot reheat steam, h_crIs the enthalpy of cold reheat steam, W_rhFor reducing the temperature and water flow of reheated steam, h_rhTo reduce the enthalpy of the reheated steam, E_1oHeat supply for the first heating mode, E_1iSupplementing/returning water heat for the first heating mode, E_noHeat supply for the nth mode of heat supply, E_niFor supplying/returning water heat in the nth heating mode, P_gIs the unit load.

6. The method for calculating the coal consumption of heat supply influence and power supply of the cogeneration unit according to claim 5, wherein correspondingly calculating the coal consumption of heat supply influence and power supply corresponding to each heat supply flow rate under each coal consumption influence boundary according to the variation of the generated heat consumption caused by heat supply corresponding to each heat supply flow rate under each coal consumption influence boundary comprises:

by using

Correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary; wherein, Δ b_gThe heat supply corresponding to the heat supply flow affects the coal consumption of power supply, the delta HR is the variation of the power generation heat consumption caused by the heat supply corresponding to the heat supply flow, and the delta HR is the HR_c-HR_g29307.6 is the calorific value of the standard coal, η_glTo the boiler efficiency, η_gdFor pipe efficiency, η_eThe power consumption of the plant.

7. The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculating device which characterized in that includes:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the average load, the heat supply mode and the average heat supply flow of the thermal power generating unit within a preset time;

the calculation module is used for acquiring a target relation corresponding to the unit average load and the heat supply mode from a pre-established heat supply influence power supply coal consumption relation, and calculating the corresponding heat supply influence power supply coal consumption by using the target relation and the average heat supply flow;

the system further comprises an establishing module for establishing a relationship of heat supply influence on power supply coal consumption in advance, wherein the establishing module comprises:

the calculation unit is used for establishing a thermal system model with heat supply corresponding to the thermal power unit steam turbine, calculating heat supply influence power supply coal consumption corresponding to different heat supply flows under each power supply coal consumption influence boundary, and respectively calculating heat supply influence power supply coal consumption relations corresponding to each power supply coal consumption influence boundary according to the different heat supply flows under each power supply coal consumption influence boundary and the heat supply influence power supply coal consumption corresponding to each heat supply flow; and the influence boundary of the power supply coal consumption comprises unit load and a heat supply mode.

8. The device for calculating the coal consumption of heat and power supply influence of the cogeneration unit according to claim 6, wherein the calculation unit comprises:

the first calculating subunit is used for calculating the power generation heat consumption rate of the steam turbine under the pure condensing working condition under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply, and calculating the power generation heat consumption rate of the steam turbine under the heat supply working condition corresponding to each type of heat supply flow under each type of power supply coal consumption influence boundary by using the thermal system model with heat supply;

the second calculating subunit is configured to correspondingly calculate a power generation heat consumption variation amount caused by heat supply corresponding to each heat supply flow rate under each power supply coal consumption influence boundary according to a pure condensing condition turbine power generation heat consumption rate under each power supply coal consumption influence boundary and a heat supply condition turbine power generation heat consumption rate corresponding to each heat supply flow rate under each power supply coal consumption influence boundary;

and the third calculating unit is used for correspondingly calculating the heat supply influence power supply coal consumption corresponding to each heat supply flow under each power supply coal consumption influence boundary according to the power generation heat consumption variable quantity caused by the heat supply corresponding to each heat supply flow under each power supply coal consumption influence boundary.

9. The utility model provides a combined heat and power generation unit heat supply influences power supply coal consumption calculation equipment which characterized in that includes:

a memory for executing a computer program;

a processor for implementing the steps of the heating influence power supply coal consumption calculation method of the cogeneration unit according to any one of claims 1 to 6 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the steps of the method for calculating the coal consumption for supplying heat and power by a cogeneration unit according to any one of claims 1 to 6.

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