CN110580663B - Calculation method for upper limit of power generation output of cogeneration unit - Google Patents
Calculation method for upper limit of power generation output of cogeneration unit Download PDFInfo
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Abstract
The invention discloses a calculation method of the upper limit of the power generation output of a cogeneration unit, which utilizes the actual heat supply quantity Q L Expansion efficiency eta, temperature T of boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The upper limit P of the power generation output of the cogeneration unit is calculated by the equal value, the calculation result is accurate, the influence caused by low reliability of the maximum power generation output value of the cogeneration unit in the heating period can be eliminated, and the power generation output can be regulated more accurately and reasonably under the condition of ensuring the heat supply effect of the unit.
Description
Technical Field
The invention relates to the technical field of automation of cogeneration units, in particular to a calculation method of power generation output of a cogeneration unit.
Background
In recent years, wind power is rapidly developed under the strong pushing of national policies, the proportion of the installed capacity of the wind power grid connection is continuously improved, and the key areas of the national wind power development are overlapped with the northern heating areas. In addition, with the rapid growth of the wind power grid-connected scale, the shortage of wind power consumption in northern heating areas is mainly represented by the gradual decline of wind power utilization hours, and the problem of wind abandoning is gradually aggravated. In addition, the power supply structure in the northern heating area mainly uses thermal power and is mostly a cogeneration unit, and the cogeneration unit is mainly used for carrying out resident heating tasks and is operated in a heat and electricity fixing operation mode, the adjustable range of the generated power is closely related to the heat load, and the peak regulation performance of the unit cannot be fully exerted in actual dispatching due to the insufficient degree of knowledge of the peak regulation performance.
Disclosure of Invention
In order to overcome the defects of the prior art means, the invention provides an accurate and reliable calculation method for the upper limit of the power generation output of the cogeneration unit.
In order to solve the technical problems, the technical scheme adopted by the invention comprises the following specific contents:
the calculation method of the upper limit of the power generation capacity of the cogeneration unit comprises the following steps,
s1: acquiring the temperature T of a boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out Then utilize the temperature T of the boiler water inlet in And pressure P in Calculating enthalpy value H of boiler water inlet in By means of the temperature T of the steam outlet of the boiler out And pressure P out Calculating enthalpy value H of steam outlet of boiler out ；
S2: by means of the enthalpy value H of the boiler water inlet in Enthalpy value H of boiler steam outlet out The mass flow m of the boiler water inlet calculates the heat absorption Q of the medium H I.e. Q H ＝m×(H out -H in )；
S3: acquiring actual heat supply quantity Q L By means of heat absorption Q H And the actual heat supply quantity Q L Calculating the external work value W of the turbine, i.e. W=Q H -Q L ；
S4: and (3) obtaining the expansion efficiency eta of the cogeneration unit, and calculating the upper limit P of the power generation by utilizing the external work value W and the expansion efficiency eta of the turbine, namely P=W×eta.
Further, the actual heat supply amount Q L The method is to collect by using a comprehensive monitoring system of the thermal power generating unit, the method for obtaining the expansion efficiency eta is obtained according to the type and the operation state of the generator, and the value range of the expansion efficiency eta is 0.5-0.8.
Further, the temperature T of the boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The acquisition mode is acquisition by utilizing a comprehensive monitoring system of the thermal power generating unit.
Further, the mass flow m of the boiler water inlet is acquired by utilizing a comprehensive monitoring system of the thermal power unit.
Preferably, the method further comprises a step S5 of calculating the adjustable quantity of the power generation output of the cogeneration unit in the heating period, specifically, the power generation output data is collected by utilizing the comprehensive monitoring system of the thermal power unit, and then the difference value between the upper limit P of the power generation output and the collected power generation output data is defined as the adjustable quantity of the power generation output of the cogeneration unit in the heating period.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a calculation method of the upper limit of the power generation output of a cogeneration unit, which utilizes the actual heat supply quantity Q L Expansion efficiency eta, temperature T of boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The upper limit P of the power generation output of the cogeneration unit is calculated by the equal value, the calculation result is accurate, the influence caused by low reliability of the maximum power generation output value of the cogeneration unit in the heating period can be eliminated, and the power generation output can be regulated more accurately and reasonably under the condition of ensuring the heat supply effect of the unit.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
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Fig. 1 is a flowchart for calculating the upper limit of the power generation capacity of the cogeneration unit.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the accompanying drawings and preferred embodiments:
as shown in fig. 1, the method for calculating the upper limit of the power generation capacity of the cogeneration unit comprises the following steps,
s1: acquiring the temperature T of a boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out Then utilize the temperature T of the boiler water inlet in And pressure P in Calculating enthalpy value H of boiler water inlet in By means of the temperature T of the steam outlet of the boiler out And pressure P out Calculating enthalpy value H of steam outlet of boiler out ；
S2: by means of the enthalpy value H of the boiler water inlet in Enthalpy value H of boiler steam outlet out The mass flow m of the boiler water inlet calculates the heat absorption Q of the medium H I.e. Q H ＝m×(H out -H in )；
S3: acquiring actual heat supply quantity Q L By means of heat absorption Q H And the actual heat supply quantity Q L Calculating the external work value W of the turbine, i.e. W=Q H -Q L ；
S4: and (3) obtaining the expansion efficiency eta of the cogeneration unit, and calculating the upper limit P of the power generation by utilizing the external work value W and the expansion efficiency eta of the turbine, namely P=W×eta.
At present, the upper limit of the power generation output of the cogeneration unit is reported according to production experience or by a thermal power plant, and the situation that the numerical value is inaccurate exists, so that the upper limit of the power generation output obtained by the cogeneration unit has larger error, the reliability of data is poor, and the flexibility of power grid peak regulation is affected. In the present invention, the method uses the actual heat supply quantity Q L Expansion efficiency eta, temperature T of boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The upper limit P of the power generation output of the cogeneration unit is calculated by the equal value, the calculation result is accurate, the influence caused by low reliability of the maximum power generation output value of the cogeneration unit in the heating period can be eliminated, and the power generation output can be regulated more accurately and reasonably under the condition of ensuring the heat supply effect of the unit.
In the present invention, the actual heat supply amount Q L The acquisition mode of (a) is to comprehensively monitor by utilizing the thermal power generating unitThe system is used for collecting the expansion efficiency eta, the obtaining mode is obtained according to the type and the operation state of the generator, and the value range of the expansion efficiency eta is 0.5-0.8.
Temperature T of boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The acquisition mode is acquisition by utilizing a comprehensive monitoring system of the thermal power generating unit. In general, the enthalpy value of the boiler water inlet is calculated by
Wherein T is θ Is the reference temperature and takes the value of 0 ℃ or 25 ℃.
The mass flow m of the boiler water inlet is acquired by utilizing a comprehensive monitoring system of the thermal power unit. In addition, the calculation method of the upper limit of the power generation capacity of the cogeneration unit further comprises a step S5 of calculating the adjustable amount of the power generation capacity of the cogeneration unit in the heating period, specifically, the power generation capacity data are collected by utilizing the comprehensive monitoring system of the thermal power unit, and then the difference value between the upper limit P of the power generation capacity and the collected power generation capacity data is defined as the adjustable amount of the power generation capacity of the cogeneration unit in the heating period. Therefore, the adjustable quantity of the power generation output of the cogeneration unit in the heating period can be obtained by collecting the collected power generation output and the upper limit P of the power generation output by the integrated monitoring system of the cremation machine unit, so that the adjustable quantity of the cogeneration unit can be corrected, peak regulation resources are fully excavated, and the power generation output of the unit is reasonably arranged.
To more specifically describe the embodiment of the present invention, the present invention provides a detailed calculation process, specifically as follows:
s1: obtaining the temperature of 272.1 ℃ and the pressure of 27.0MPa of the water inlet of the boiler, and calculating the enthalpy value H of the water inlet of the boiler in The calculation formula is as follows:
selecting a reference temperature of 25 ℃ and H θ ＝-242.00kJ/mol，C p ＝50.8111+0.212938T-0.630974×10 -3 T 2 +0.0648311×10 -5 T 3 Can be obtained by integrationEnthalpy value H to boiler water inlet in = 1199.8kJ/kg; the temperature of the water outlet of the boiler is 562 ℃ and the pressure is 24MPa, and the enthalpy value H of the steam outlet of the boiler is obtained through a steam table out ＝3381.2kJ/kg。
S2: acquiring mass flow m= 969.3t/H of a boiler water inlet by utilizing a motor set integrated monitoring system, and utilizing enthalpy value H of the boiler water inlet in Enthalpy value H of boiler steam outlet out The mass flow m of the boiler water inlet calculates the heat absorption Q of the medium H ＝m×(H out -H in )＝587.3MW。
S3: actual heat supply quantity Q acquired by utilizing comprehensive monitoring system of thermal power generating unit L =183.9mw, using heat absorption Q H And the actual heat supply quantity Q L Calculating the external work value W of the turbine, i.e. W=Q H -Q L ＝403.4MW；
S4: the power plant adopts a 350MW heat supply unit, the expansion efficiency eta is 0.68, and the upper limit P=W×eta= 274.3 of the power generation capacity is calculated by utilizing the external work value W and the expansion efficiency eta of the turbine.
S5: the power generation output data acquired by the comprehensive monitoring system of the thermal power generating unit is 258.3MW, and the adjustable power generation output of the thermal power generating unit is 16MW.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (5)
1. A calculation method of the upper limit of the power generation capacity of a cogeneration unit is characterized by comprising the following steps of: comprises the following steps of the method,
s1: acquiring the temperature T of a boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out Then utilize the temperature T of the boiler water inlet in And pressure P in Calculating enthalpy value H of boiler water inlet in By means of the temperature T of the steam outlet of the boiler out And pressure P out Calculating enthalpy value H of steam outlet of boiler out ；
S2: by means of the enthalpy value H of the boiler water inlet in Enthalpy value H of boiler steam outlet out The mass flow m of the boiler water inlet calculates the heat absorption Q of the medium H I.e. Q H ＝m×(H out -H in )；
S3: acquiring actual heat supply quantity Q L By means of heat absorption Q H And the actual heat supply quantity Q L Calculating the external work value W of the turbine, i.e. W=Q H -Q L ；
S4: and (3) obtaining the expansion efficiency eta of the cogeneration unit, and calculating the upper limit P of the power generation by utilizing the external work value W and the expansion efficiency eta of the turbine, namely P=W×eta.
2. The method for calculating the upper limit of the power generation capacity of the cogeneration unit according to claim 1, wherein: actual heat supply quantity Q L The method is to collect by using a comprehensive monitoring system of the thermal power generating unit, the method for obtaining the expansion efficiency eta is obtained according to the type and the operation state of the generator, and the value range of the expansion efficiency eta is 0.5-0.8.
3. The method for calculating the upper limit of the power generation capacity of the cogeneration unit according to claim 1, wherein: temperature T of boiler water inlet in And pressure P in Temperature T of boiler steam outlet out And pressure P out The acquisition mode is acquisition by utilizing a comprehensive monitoring system of the thermal power generating unit.
4. The method for calculating the upper limit of the power generation capacity of the cogeneration unit according to claim 1, wherein: the mass flow m of the boiler water inlet is acquired by utilizing a comprehensive monitoring system of the thermal power unit.
5. The method for calculating the upper limit of the power generation capacity of the cogeneration unit according to any one of claims 1 to 4, wherein: the method also comprises a step S5 of calculating the adjustable quantity of the power generation output of the cogeneration unit in the heating period, and specifically comprises the steps of utilizing a comprehensive monitoring system of the thermal power unit to collect power generation output data, and defining the difference value between the upper limit P of the power generation output and the collected power generation output data as the adjustable quantity of the power generation output of the cogeneration unit in the heating period.
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| US9388766B2 (en) * | 2012-03-23 | 2016-07-12 | Concentric Power, Inc. | Networks of cogeneration systems |
| CN103699941B (en) * | 2013-12-10 | 2018-01-09 | 国家电网公司 | A kind of formulating method of electric power system dispatching operation year scheme |
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| JP2013231377A (en) * | 2012-04-27 | 2013-11-14 | Toyota Industries Corp | Waste heat regeneration system |
| CN108258679A (en) * | 2017-12-25 | 2018-07-06 | 国网浙江省电力有限公司经济技术研究院 | Consider the electric-thermal integrated energy system Optimization Scheduling of heating network heat accumulation characteristic |
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