CN111396146B - Performance test and analysis calculation method for steam turbine heat supply steam extraction main pipe with multiple back pressing machines - Google Patents
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Abstract
The invention discloses a combined performance test method and an analysis and calculation method of performance indexes of a whole set of system when a heat supply steam extraction main pipe of a high-capacity extraction condensing steam turbine is provided with a plurality of back presses. Carrying out performance test and economic analysis on a large-capacity condensing turbine unit and a plurality of back pressure machines of a heat supply first station as a whole; stabilizing the electric load of the extraction condensing unit and the backpressure unit, the heat supply extraction flow of the extraction condensing unit and the heat supply load of the whole system, isolating the external steam exhaust and drainage of the system, and performing a combined performance test of the extraction condensing unit with the backpressure unit; selecting a back pressure machine set to carry out a monomer test, and calculating performance indexes such as the power generation power of a high-capacity extraction condensing unit, the heat consumption rate of a steam turbine and the like; calculating the change of the heat supply and steam extraction amount of the condensing unit and the change of the generated energy of the whole system under the condition that the back pressure unit is stopped; under the condition that the backpressure unit is put into operation, the increase of the generated energy of the whole system is used as the benefit of generating electricity by utilizing the pressure difference of the backpressure unit of the heat supply steam extraction main pipe.
Description
Technical Field
The invention relates to the field of power generation, in particular to a combined performance test method and an analysis and calculation method of performance indexes of a whole set of system when a plurality of high-capacity extraction steam turbines heat supply extraction steam main pipes are provided with a plurality of back presses.
Background
At present, China is in the period of industrialized and urbanized accelerated development, with the development of cities and the improvement of living conditions of people, the heat supply area and the heat supply load are continuously increased, the heat load demand is continuously increased, and the heat supply device is taken as the heat supply work of one of government 'civil' projects, relates to the quality of life of thousands of households, and is increasingly paid attention.
Steam extraction heat supply is the most used heat supply mode at present, and along with gradually shutting down a small-capacity unit with high energy consumption and serious pollution, the heat supply of a large-capacity or supercritical parameter unit becomes necessary. And the high-capacity and supercritical parameter unit mostly utilizes the steam extraction heat supply of the medium-low pressure cylinder communicating pipe, has high heat supply steam quality, is directly used for heating and heat supply, and has larger energy loss. Therefore, in order to realize the gradient utilization of energy, a back pressure turbine is additionally arranged before heat supply extraction steam enters an external network or a heat supply initial station, and heat supply is carried out after the heat supply extraction steam enters a back pressure machine to generate power and is reduced to parameters matched with the external network or the heat supply initial station.
Because the heat load of the heat supply network is high and the heat supply extraction amount is large, a plurality of units are needed for heat supply, the heat supply extraction steam of different units is mixed to a main pipe and then to a back pressure turbine, and a plurality of back pressure turbines are arranged in a heat supply initial station. Due to the complexity of the main pipe heating system, the performance test of a high-capacity or supercritical parameter heating unit and a backpressure unit and the calculation and analysis of the economic indexes of the whole system are difficult.
The performance test method and the analysis and calculation method which are presented at present use a large-capacity heat supply unit and a back pressure turbine as independent individuals to independently test, and do not analyze the economy of the whole system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a combined performance test method and an analysis and calculation method of a whole set of system performance indexes when a heat supply steam extraction main pipe of a high-capacity or supercritical parameter extraction steam turbine is provided with a plurality of back pressure steam turbines.
The technical scheme adopted by the invention for solving the problems is as follows:
during heating, several high capacity extraction condensing units utilize the extracted steam from the medium and low pressure cylinder communicating pipe to supply heat externally, and the extracted steam from several units is combined into one main pipe to enter several back pressure turbines in the first heat supply station to generate electricity, and the generated back pressure exhausted steam enters the first heat supply network heater to heat the circulating water in the heat supply network.
A performance test and analysis calculation method for a steam turbine heat supply steam extraction main pipe with a plurality of back presses is characterized by comprising the following steps: the heat supply steam extraction pipeline of a plurality of extraction condensing units in the system is connected with the heat supply steam extraction main pipe when the steam turbine heat supply steam extraction main pipe is provided with a plurality of back pressure type steam turbines in a heat supply initial station, the heat supply steam extraction main pipe is connected with a plurality of back pressure type steam turbines in the heat supply initial station, the back pressure type steam turbines are used for generating electricity, the exhaust steam of the back pressure type steam turbines enters a heat supply network heater in the heat supply initial station, heat is transferred to heat supply network circulating water, the exhaust steam returns to a condensing water system of the extraction condensing type steam turbines after being condensed into water, and the combined performance test and economic index analysis and calculation method of the extraction condensing units and the back pressure units comprises the following specific steps:
the first step is as follows: adjusting the electrical load and the heat supply steam extraction flow of the integral extraction and condensation unit to be the same, operating the extraction and condensation unit, and not communicating the extraction and condensation unit with an external system except for draining water returning to a unit condensation water system from an external heat supply steam extraction and heat supply initial station, and not communicating the extraction and condensation unit with the external system;
the second step is that: determining one of a plurality of backpressure units in a heat supply initial station to perform a performance test;
the third step: installing a differential pressure transmitter, a pressure transmitter and a thermocouple for measuring the steam inlet flow, the steam inlet pressure, the steam inlet temperature, the steam exhaust pressure and the steam exhaust temperature of the test backpressure machine; installing a power transmitter for measuring the generating power of the back pressure machine;
the fourth step: stabilizing the electrical load and the thermodynamic system of the extraction condensing unit and the backpressure unit, and performing a combined test of the extraction condensing unit and the backpressure unit;
the fifth step: according to the performance test rule of the steam turbine, calculating the steam consumption rate and the heat consumption rate index of the test back press according to the test data;
and a sixth step: the calculated steam consumption rate of the single backpressure unit is multiplied by the generated power of all the backpressure units to obtain the total flow of the heat supply steam extraction main pipe, and the heat supply steam extraction amount operation data of the extraction and condensation unit is corrected according to the total flow;
the seventh step: calculating the thermal performance of the extraction condensing unit by utilizing the finally determined heat supply extraction flow and the relevant parameters of the extraction condensing unit measured by the operation measuring system, wherein the indexes comprise the indexes of power generation power, heat consumption rate of a steam turbine and the like;
eighth step: calculating the change of the steam extraction amount of the extraction condensing unit and the change of the generated energy of the whole system under the condition that the back pressure unit is stopped according to the conditions that the steam inlet flow of the extraction condensing unit is not changed and the external heat supply load is not changed; under the condition that the backpressure unit is put into operation, the increase of the generated energy of the whole system is used as the benefit of generating electricity by utilizing the pressure difference of the backpressure unit of the heat supply steam extraction main pipe.
Furthermore, a plurality of extraction condensing units with the same capacity carry a plurality of back pressure units to generate electricity through the steam extraction main pipe, and because the pipe diameter of a heat supply steam extraction pipeline of the extraction condensing units is large and the flow measurement accuracy does not meet the requirement, the total heat supply steam extraction flow is calculated by utilizing the steam consumption rate obtained by the back pressure unit test, so that the heat supply steam extraction flow of the extraction condensing units is corrected.
Further, based on the conditions that the steam inlet flow of the extraction and condensation unit is not changed and the external heat supply load is not changed, the increase of the generated energy of the whole system under the working conditions of operation and outage of the backpressure unit is calculated, and the benefit of generating electricity by utilizing the heat supply steam extraction pressure difference is obtained by additionally arranging the backpressure unit.
Compared with the prior art, the invention has the following advantages and effects:
1. the combined performance test method of the extraction condensing unit and the backpressure unit is provided under the condition that a large-capacity heat supply extraction unit utilizes an extraction main pipe to carry a plurality of backpressure units;
2. providing an analysis and calculation method of economic indexes of a high-capacity extraction condensing unit and a backpressure unit under the condition that the accuracy of heat supply extraction steam flow does not meet the requirement;
3. a method for analyzing and calculating the economic benefit of the whole system under the condition of generating power by using differential pressure is provided.
Drawings
Fig. 1 is a schematic system structure according to an embodiment of the present invention.
In the figure: the system comprises a first extraction condensing unit 1, a second extraction condensing unit 2, a first unit heat supply steam extraction pipeline 3, a second unit heat supply steam extraction pipeline 4, a heat supply steam extraction main pipe 5, a back pressure type steam turbine 6, a heat supply network heater 7, a heat supply network water return pipeline 8, a heat supply network water supply pipeline 9, a drain pump 10, a first unit condensed water pipeline 11 and a second unit condensed water pipeline 12.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, the system for the steam turbine heat supply steam extraction main pipe with multiple back-pressure machines comprises a first steam extraction and condensation unit 1, a second steam extraction and condensation unit 2 and a back-pressure steam turbine 6, wherein the first steam extraction and condensation unit 1 and the second steam extraction and condensation unit 2 are respectively connected to a heat supply steam extraction main pipe 5 through a first unit heat supply steam extraction pipeline 3 and a second unit heat supply steam extraction pipeline 4, the heat supply steam extraction main pipe 5 is connected with the multiple back-pressure steam turbines 6, the back-pressure steam turbine 6 is connected with a heat supply network heater 7, a heat supply network water inlet and a heat supply network water outlet of the heat supply network heater 7 are respectively communicated with a heat supply network water return pipeline 8 and a heat supply network water supply pipeline 9, and a water outlet of the heat supply network heater 7 is communicated with a unit condensation water pipeline 11 and a second unit condensation water pipeline 12 through a drain pump 10.
The performance test and analysis calculation method when the heat supply steam extraction main pipe of the steam turbine is provided with a plurality of back pressure machines is as follows:
in the embodiment, two supercritical 670MW extraction condensing units are provided, and a combined system of 6MW back pressure units of a heat supply primary station is provided through a heat supply steam extraction main pipe, and the performance test and analysis calculation method comprises the following specific steps:
the first step is as follows: adjusting the electrical load and the heat supply extraction steam flow of the two supercritical 670MW extraction and condensation units to be the same, operating the unit system, and isolating the communication between the thermodynamic systems of the two units except for draining the external heat supply extraction steam and the condensate system of the extraction and condensation unit returned from the heat supply initial station;
the second step is that: determining one of the 6 backpressure units for performance test;
the third step: installing a differential pressure transmitter, a pressure transmitter and a thermocouple for measuring the steam inlet flow, the steam inlet pressure, the steam inlet temperature, the steam exhaust pressure and the steam exhaust temperature of the test backpressure unit; installing a power transmitter for measuring the generating power of the back pressure machine;
the fourth step: the heat supply first station backpressure unit is full of 6MW, and the electric loads of the 6 units are adjusted to be the same;
the fifth step: stabilizing the electrical load and thermodynamic systems of the two supercritical 670MW extraction and condensation units and the 6 backpressure units, and performing a combined test of the extraction and condensation units and the backpressure units;
and a sixth step: according to the performance test rule of the steam turbine, calculating the steam consumption rate and heat consumption rate indexes of the test back press according to the test data;
the seventh step: the calculated steam consumption rate of the single back pressure unit is multiplied by the total power generation power of 6 back pressure units to obtain the total flow of the heat supply steam extraction main pipe, and the heat supply steam extraction amount of the two supercritical 670MW units is corrected according to the total flow;
eighth step: calculating the thermal performance of the supercritical 670MW unit by using the finally determined heat supply extraction flow and relevant operation parameters of the supercritical 670MW unit measured by the operation measuring system, wherein the thermal performance comprises indexes such as power generation power, heat consumption rate of a steam turbine and the like;
the ninth step: according to the conditions that the steam inlet flow of the supercritical 670MW unit is unchanged and the external heat supply load is unchanged, the change of the steam extraction amount of the supercritical 670MW unit and the change of the generated energy of the whole system are calculated under the condition that the back pressure unit is stopped. Under the condition that the backpressure unit is put into operation, the increase of the generated energy of the whole system is used as the benefit of generating electricity by utilizing the pressure difference of the backpressure unit of the heat supply steam extraction main pipe.
In the embodiment, for the accuracy of calculation, two supercritical 670MW unit systems operate, except that the drainage returned from the heat supply extraction and heat supply initial station enters a condensed water system, the communication with an external thermodynamic system is isolated, external drainage, steam exhaust and system water supplement are stopped, boiler soot blowing and steam exhaust are stopped, the electric load and the heat supply extraction flow of the two supercritical 670MW unit systems are basically the same, and the power generation power is maintained to be stably operated above 80% of rated load as much as possible; the 6 backpressure units at the first heat supply station stably operate with the rated load of 6MW or more than 80% of the rated load as much as possible, if the heat supply extraction flow is insufficient, 1 or 2 backpressure units can be stopped, other units operate at high load and maintain the same, the thermodynamic systems of the backpressure units also need to be isolated, drainage of related systems is stopped, and the like.
In this embodiment, the test can be performed under the conditions that the steam inlet flow and the external heat load of the two supercritical 670MW units are kept unchanged, and all the backpressure units are shut down, the power generation powers of the two supercritical 670MW units are measured and compared with the above working conditions, and the change of the power generation power of the whole system is calculated.
In this embodiment, the comprehensive analysis and calculation of economic indicators are performed based on the conditions that the steam inlet flow of two supercritical 670MW units is not changed and the external heat load is not changed. Under two working conditions of operation and shutdown of the back pressure unit, the steam extraction amount of the supercritical 670MW unit and the power generation amount of the whole system are changed. Under the condition that the backpressure unit is put into operation, the increase of the generated energy of the whole system is used as the benefit of generating electricity by utilizing the pressure difference of the backpressure unit of the heat supply steam extraction main pipe.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (1)
1. A performance test and analysis calculation method for a steam turbine heat supply steam extraction main pipe with a plurality of back presses is characterized by comprising the following steps: the heat supply steam extraction pipeline of a plurality of extraction condensing units in the system is connected with the heat supply steam extraction main pipe when the steam turbine heat supply steam extraction main pipe is provided with a plurality of back pressure type steam turbines in a heat supply initial station, the heat supply steam extraction main pipe is connected with a plurality of back pressure type steam turbines in the heat supply initial station, the back pressure type steam turbines are used for generating electricity, the exhaust steam of the back pressure type steam turbines enters a heat supply network heater in the heat supply initial station, heat is transferred to heat supply network circulating water, the exhaust steam returns to a condensing water system of the extraction condensing type steam turbines after being condensed into water, and the combined performance test and economic index analysis and calculation method of the extraction condensing units and the back pressure units comprises the following specific steps:
the first step is as follows: adjusting the electrical load and the heat supply steam extraction flow of the integral extraction and condensation unit to be the same, operating the extraction and condensation unit, and not communicating the extraction and condensation unit with an external system except for draining water returning to a unit condensation water system from an external heat supply steam extraction and heat supply initial station, and not communicating the extraction and condensation unit with the external system;
the second step is that: determining one of a plurality of backpressure units in a heat supply initial station to perform a performance test;
the third step: installing a differential pressure transmitter, a pressure transmitter and a thermocouple for measuring the steam inlet flow, the steam inlet pressure, the steam inlet temperature, the steam exhaust pressure and the steam exhaust temperature of the test back press; installing a power transmitter for measuring the generating power of the back pressure machine;
the fourth step: stabilizing the electrical load and the thermodynamic system of the extraction condensing unit and the backpressure unit, and performing a combined test of the extraction condensing unit and the backpressure unit;
the fifth step: according to the performance test rule of the steam turbine, calculating the steam consumption rate and the heat consumption rate index of the test back press according to the test data;
and a sixth step: the calculated steam consumption rate of the single backpressure unit is multiplied by the generated power of all the backpressure units to obtain the total flow of the heat supply steam extraction main pipe, and the heat supply steam extraction amount operation data of the extraction and condensation unit is corrected according to the total flow;
the seventh step: calculating the thermal performance of the extraction and condensation unit by utilizing the finally determined heat supply extraction flow and the relevant parameters of the extraction and condensation unit measured by the operation measuring system;
eighth step: calculating the change of the steam extraction amount of the extraction condensing unit and the change of the generated energy of the whole system under the condition that the back pressure unit is stopped according to the conditions that the steam inlet flow of the extraction condensing unit is not changed and the external heat supply load is not changed; under the condition that the backpressure unit is put into operation, the increase of the generated energy of the whole system is used as the benefit of generating electricity by utilizing the pressure difference of the backpressure unit of the heat supply steam extraction main pipe.
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