CN212479352U - Steam turbine body and backheating system integrated comprehensive efficiency improving system under steam parameter improving condition - Google Patents
Steam turbine body and backheating system integrated comprehensive efficiency improving system under steam parameter improving condition Download PDFInfo
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Abstract
The utility model relates to a steam turbine body and the integrated comprehensive system of imitating of backheating system under steam parameter promotion condition, it includes boiler, steam turbine high pressure jar, steam turbine intermediate pressure jar, steam turbine low pressure jar, condenser, condensate pump, feed pump, one-level air extraction pipeline, second grade air extraction pipeline, tertiary air extraction pipeline, level four air extraction pipeline, level five air extraction pipeline, level six air extraction pipeline, level seven air extraction pipeline, level eight air extraction pipeline, level 1# high pressure heater, level 2# high pressure heater, level 3 high pressure heater, oxygen-eliminating device, level 5# low pressure heater, level 6 low pressure heater, level 7 low pressure heater and level 8 low pressure heater to carry imitate the system; steam enters a condenser to be condensed into water after sequentially passing through a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder, and the system is a new development of an energy-saving technology; after steam parameters of the steam turbine body are improved, the heat exchange capacity of the heaters at all levels is met by optimizing the air extraction parameters at all levels, the replacement quantity of the heaters is avoided or reduced, and the modification cost is reduced.
Description
Technical Field
The utility model relates to a coal-fired power generation field, specifically say, relate to a steam turbine body and the integrated comprehensive system of raising of backheating system under steam parameter promotes the condition and imitates the system.
Background
With the development of economy and the continuous progress of science and technology, new technology is continuously applied to the transformation of power plant equipment, the requirements on energy consumption indexes and environmental protection indexes of enterprises are continuously improved, and coal-fired power generation enterprises face stricter environmental protection requirements and severe market operation situations.
The related file requirements of the national modified energy [ 2014 ] 2093 file are as follows: the average power supply coal consumption reaches 310 g/(kWh & h) after the active coal-fired generating set is transformed by 2020, wherein the average power supply coal consumption is lower than 300 g/(kWh & h) after the active 60 ten thousand kilowatt and above units (except for the air cooling unit) are transformed. After that, the national and local governments continuously send out matching policy documents, and specific requirements are put forward for specific time nodes for energy-saving upgrading and modification and the compulsory performance of related standards. According to the requirements of relevant national policies and documents, the energy consumption index of a subcritical unit hardly meets the requirements of new situation, the actual operation condition of the subcritical unit comprehensively considers the factors such as coal consumption index of the unit, reconstruction investment cost, technical risk and competitiveness of the energy consumption index of the unit, and the steam parameter improvement and reconstruction are important technical measures for improving the energy consumption index of the subcritical unit in China.
The steam parameter is improved and modified, the materials of a steam turbine body, a boiler heating surface, a thermodynamic system pipeline and a valve need to be upgraded or replaced, the steam turbine body and a steam extraction regenerative system are greatly influenced, the steam extraction temperature and flow change of a unit is obvious, and whether the heat exchange area of the existing heater meets the requirement needs to be checked. Therefore, it is necessary to design a system and a method for integrating and comprehensively improving the efficiency of the steam turbine body and the heat recovery system under the steam parameter improving condition to optimize the air extraction parameters, so as to achieve the purposes of avoiding or reducing the number of heaters to be replaced and reducing the modification cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a steam turbine body and the integrated comprehensive system of raising of backheating system under the steam parameter promotion condition that structural design is reasonable to give it and carry the effect method.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a steam turbine body and integrated comprehensive efficiency improving system of backheat system under steam parameter promotes condition which characterized in that: the system comprises a boiler, a high-pressure turbine cylinder, a medium-pressure turbine cylinder, a low-pressure turbine cylinder, a condenser, a condensate pump, a water feed pump, a first-stage air extraction pipeline, a second-stage air extraction pipeline, a third-stage air extraction pipeline, a fourth-stage air extraction pipeline, a fifth-stage air extraction pipeline, a sixth-stage air extraction pipeline, a seventh-stage air extraction pipeline, an eight-stage air extraction pipeline, a 1# high-pressure heater, a 2# high-pressure heater, a 3# high-pressure heater, a deaerator, a 5# low-pressure heater, a 6# low-pressure heater, a 7; the boiler is provided with a feed water inlet and a steam outlet, the steam outlet is connected with the high-pressure cylinder of the steam turbine through a first pipeline, and the steam enters the high-pressure cylinder of the steam turbine through the first pipeline, does work through the high-pressure cylinder of the steam turbine and then enters the medium-pressure cylinder of the steam turbine through a second pipeline; one end of the second pipeline is connected with the high-pressure turbine cylinder, the other end of the second pipeline is connected with the medium-pressure turbine cylinder, and the second pipeline penetrates through the boiler; the steam turbine medium pressure cylinder and the steam turbine low pressure cylinder are connected through a third pipeline, and the steam turbine low pressure cylinder is connected with the condenser through a fourth pipeline; the condenser is connected with the water inlet end of the 8# low-pressure heater through a fifth pipeline, and the condensate pump is installed on the fifth pipeline; the water outlet end of the 8# low-pressure heater is communicated with the water inlet end of the 7# low-pressure heater, the water outlet end of the 7# low-pressure heater is communicated with the water inlet end of the 6# low-pressure heater, the water outlet end of the 6# low-pressure heater is communicated with the water inlet end of the 5# low-pressure heater, the water outlet end of the 5# low-pressure heater is communicated with the inlet end of the deaerator, the water outlet end of the deaerator is communicated with the water inlet end of the water feed pump, the water outlet end of the water feed pump is communicated with the water inlet end of the 3# high-pressure heater, the water outlet end of the 3# high-pressure heater is communicated with the water inlet end of the 2# high-pressure heater, the water outlet end of the 2# high-pressure heater is communicated; the bottoms of the 1# high-pressure heater, the 2# high-pressure heater, the 3# high-pressure heater, the 5# low-pressure heater, the 6# low-pressure heater, the 7# low-pressure heater and the 8# low-pressure heater are provided with drainage outlets; the drainage outlet at the bottom of the No. 1 high-pressure heater is communicated with the No. 2 high-pressure heater, the drainage outlet at the bottom of the No. 2 high-pressure heater is communicated with the No. 3 high-pressure heater, and the drainage outlet at the bottom of the No. 3 high-pressure heater is communicated with the deaerator; the drain outlet at the bottom of the No. 5 low-pressure heater is communicated with the No. 6 low-pressure heater, the drain outlet at the bottom of the No. 6 low-pressure heater is communicated with the No. 7 low-pressure heater, the drain outlet at the bottom of the No. 7 low-pressure heater is communicated with the No. 8 low-pressure heater, and the drain outlet at the bottom of the No. 8 low-pressure heater is communicated with the condenser; two ends of the first-stage air extraction pipeline are respectively connected with a steam turbine high-pressure cylinder and a No. 1 high-pressure heater; two ends of the secondary air extraction pipeline are respectively connected with a steam turbine high-pressure cylinder and a No. 2 high-pressure heater; two ends of the three-stage air extraction pipeline are respectively connected with a steam turbine intermediate pressure cylinder and a 3# high pressure heater; two ends of the four-stage air extraction pipeline are respectively connected with a steam turbine intermediate pressure cylinder and a deaerator; two ends of the five-stage air extraction pipeline are respectively connected with a steam turbine low-pressure cylinder and a No. 5 low-pressure heater; two ends of the six-stage air extraction pipeline are respectively connected with a steam turbine low-pressure cylinder and a No. 6 low-pressure heater; two ends of the seven-stage air extraction pipeline are respectively connected with a steam turbine low-pressure cylinder and a 7# low-pressure heater; and two ends of the eight-stage air extraction pipeline are respectively connected with a steam turbine low-pressure cylinder and an 8# low-pressure heater.
And the secondary air extraction pipeline is communicated with the high-pressure cylinder of the steam turbine through a second pipeline.
The utility model also provides a steam turbine body and the integrated comprehensive method of imitating of backheating system under the steam parameter promotes condition, adopt foretell to carry out the system of imitating, its characterized in that: the method comprises the following steps:
the method comprises the following steps: and (3) efficiency improving system operation: steam generated by a boiler firstly enters a high-pressure cylinder of the steam turbine, then the steam enters a medium-pressure cylinder of the steam turbine through a second pipeline, then enters a low-pressure cylinder of the steam turbine through a third pipeline, and finally enters a condenser to be cooled into condensed water, and the condensed water is heated by a condensed water pump and then sequentially passes through a 8# low-pressure heater, a 7# low-pressure heater, a 6# low-pressure heater, a 5# low-pressure heater, a deaerator, a water feed pump, a 3# high-pressure heater, a 2# high-pressure heater and a 1# high-pressure heater to become feed water to enter the boiler;
step two: pumping steam in the steam turbine body into corresponding heaters and deaerators through an air pumping pipeline, enabling drain water generated after steam in the three high-pressure heaters is cooled to finally enter the deaerators, and enabling drain water generated after steam in the four low-pressure heaters is cooled to finally enter the condensers;
step three: the steam parameters of the steam turbine body are improved, the steam inlet parameters and the steam inlet quantity of each heater and the deaerator correspondingly change, and the actual operation effect of each heater and the deaerator is checked;
step four: if the heat exchange area of the heater cannot meet the heat exchange requirement after the steam parameters are improved, steam extraction parameter optimization is required;
step five: and optimizing steam extraction parameters until the heat exchange capacity requirement of each heater is matched with the actual heat exchange effect of the heater.
Compared with the prior art, the utility model, have following advantage and effect:
1. the efficiency improving system integrates the steam turbine body and the heat regeneration system, and after steam parameters of the steam turbine body are improved, the heaters at all levels meet the heat exchange capacity by optimizing the air extraction parameters at all levels, so that the replacement quantity of the heaters is avoided or reduced, and the modification cost is reduced;
2. the efficiency improving system and method are new development of energy saving technology under the current power situation;
3. the heat consumption rate of the steam turbine is reduced while the operation economy of the regenerative system is improved, the replacement cost of a heater is avoided or reduced, and the economic effect is obvious;
4. the steam turbine body and the regenerative system are integrated and comprehensively considered, the method is the optimization and integration of energy-saving reconstruction projects, belongs to the category of deep energy saving, provides a new idea for energy-saving efficiency improvement reconstruction of a power plant, and has wide development prospect.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of an effect-improving system according to an embodiment of the present invention.
Description of reference numerals: the system comprises a first-stage air extraction pipeline 1, a second-stage air extraction pipeline 2, a third-stage air extraction pipeline 3, a fourth-stage air extraction pipeline 4, a fifth-stage air extraction pipeline 5, a sixth-stage air extraction pipeline 6, a seventh-stage air extraction pipeline 7, an eight-stage air extraction pipeline 8, a boiler 9, a high-pressure turbine cylinder 10, a medium-pressure turbine cylinder 11, a low-pressure turbine cylinder 12, a condenser 13, a condensate pump 14, a 1# high-pressure heater 15, a 2# high-pressure heater 16, a 3# high-pressure heater 17, a water feed pump 18, a deaerator 19, a 5# low-pressure heater 20, a 6# low-pressure heater 21, a 7# low-pressure heater 22, a 8# low-pressure heater 23, a first pipeline 91, a second pipeline 92.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
In the production design stage of the steam turbine unit, steam extraction parameters of all sections are designed steam inlet parameters of the heater, and the heat exchange effect of the heater is considered on the premise of ensuring the heat consumption rate of the steam turbine. When the temperature of the main steam and the reheated steam is increased, the steam extraction parameters and the steam extraction quantity at all levels are correspondingly changed, the original heat exchange area of a part of the heaters cannot meet the requirement, and if the heat exchange area is not increased, the heat exchange effect of a regenerative system can be influenced, so that the problem that the water supply temperature of a unit is low is caused. The steam parameter of the unit is promoted and has great influence to the steam turbine body and the extraction heat regeneration system, and the extraction parameter of the unit changes, and the influence of production mainly has: (1) if the heat exchange area of the existing heater is insufficient, the heater needs to be replaced; (2) the heat exchange of the steam extraction heat recovery system is insufficient, and the water supply temperature is influenced; (3) the extraction flow of the heater is influenced, and the heat consumption rate of the operation of the steam turbine is increased.
The current extraction parameters are selected on the basis of the lowest heat consumption rate of the steam turbine without considering the heat exchange performance of the heater, and the influence of the extraction regenerative system on the heat consumption rate of the steam turbine is corrected in the performance test calculation process, but the influence on the coal consumption of the unit operation is adversely affected.
The embodiment of the invention discloses a steam turbine body and regenerative system integrated comprehensive efficiency improving system under a steam parameter improving condition, which can solve the problems, and referring to fig. 1, the efficiency improving system comprises a boiler 9, a steam turbine high-pressure cylinder 10, a steam turbine intermediate-pressure cylinder 11, a steam turbine low-pressure cylinder 12, a condenser 13, a condensate pump 14, a first-stage air extraction pipeline 1, a second-stage air extraction pipeline 2, a third-stage air extraction pipeline 3, a fourth-stage air extraction pipeline 4, a fifth-stage air extraction pipeline 5, a sixth-stage air extraction pipeline 6, a seventh-stage air extraction pipeline 7, an eight-stage air extraction pipeline 8, a 1# high-pressure heater 15, a 2# high-pressure heater 16, a 3# high-pressure heater 17, a water feeding pump 18, a deaerator 19, a 5# low-pressure heater 20, a 6# low-pressure.
In this embodiment, the boiler 9 has a feed water inlet and a steam outlet, the steam outlet is connected to the turbine high pressure cylinder 10 through the first pipeline 91, and the steam enters the turbine high pressure cylinder 10 through the first pipeline 91, applies work to the turbine high pressure cylinder 10, and then enters the turbine intermediate pressure cylinder 11 through the second pipeline 92. The second pipeline 92 is connected to the turbine high pressure cylinder 10 at one end and the turbine medium pressure cylinder 11 at the other end, and the second pipeline 92 passes through the boiler 9. The turbine intermediate pressure cylinder 11 is connected with the turbine low pressure cylinder 12 through a third pipeline 93, and the turbine low pressure cylinder 12 is connected with the condenser 13 through a fourth pipeline 94; the condenser 13 is connected with the inlet end of the No. 8 low-pressure heater 22 through a No. five pipeline 95, and the condensate pump 14 is installed on the No. five pipeline 95.
In this embodiment, the water outlet end of the # 8 low-pressure heater 23 is connected to the water inlet end of the # 7 low-pressure heater 22, the water outlet end of the # 7 low-pressure heater 22 is connected to the water inlet end of the # 6 low-pressure heater 21, the water outlet end of the # 6 low-pressure heater 21 is connected to the water inlet end of the # 5 low-pressure heater 20, the water outlet end of the # 5 low-pressure heater 20 is connected to the water inlet end of the deaerator 19, the water outlet end of the deaerator 19 is connected to the water inlet end of the water feed pump 18, the water outlet end of the water feed pump 18 is connected to the water inlet end of the # 3 high-pressure heater 17, the water outlet end of the # 3 high-pressure heater 17 is connected to the water inlet end of the # 2 high-pressure heater 16, the water outlet end of the # 2 high-pressure heater 16 is connected to the water inlet end of the #.
In the present embodiment, the bottoms of the # 1 high-pressure heater 15, the # 2 high-pressure heater 16, the # 3 high-pressure heater 17, the # 5 low-pressure heater 20, the # 6 low-pressure heater 21, the # 7 low-pressure heater 22, and the # 8 low-pressure heater 23 are provided with drain outlets. The drainage outlet at the bottom of the 1# high-pressure heater 15 is communicated with a 2# high-pressure heater 16, the drainage outlet at the bottom of the 2# high-pressure heater 16 is communicated with a 3# high-pressure heater 17, and the drainage outlet at the bottom of the 3# high-pressure heater 17 is communicated with a deaerator 19. The drain outlet at the bottom of the No. 5 low-pressure heater 20 is communicated with the No. 6 low-pressure heater 21, the drain outlet at the bottom of the No. 6 low-pressure heater 21 is communicated with the No. 7 low-pressure heater 22, the drain outlet at the bottom of the No. 7 low-pressure heater 22 is communicated with the No. 8 low-pressure heater 23, and the drain outlet at the bottom of the No. 8 low-pressure heater 23 is communicated with the condenser.
In this embodiment, two ends of the first-stage extraction pipeline 1 are respectively connected with the steam turbine high-pressure cylinder 10 and the # 1 high-pressure heater 15; two ends of the secondary extraction pipeline 2 are respectively connected with a steam turbine high-pressure cylinder 10 and a # 2 high-pressure heater 16; two ends of the three-stage air extraction pipeline 3 are respectively connected with a steam turbine intermediate pressure cylinder 11 and a # 3 high pressure heater 17; two ends of the four-stage air extraction pipeline 4 are respectively connected with a steam turbine intermediate pressure cylinder 11 and a deaerator 19; two ends of the five-stage extraction pipeline 5 are respectively connected with a steam turbine low-pressure cylinder 12 and a No. 5 low-pressure heater 20; two ends of the six-stage extraction pipeline 6 are respectively connected with a steam turbine low-pressure cylinder 12 and a No. 6 low-pressure heater 21; two ends of the seven-stage extraction pipeline 7 are respectively connected with the steam turbine low-pressure cylinder 12 and the 7# low-pressure heater 22; two ends of the eight-stage extraction pipeline 8 are respectively connected with the steam turbine low-pressure cylinder 12 and the No. 8 low-pressure heater 23.
In this embodiment, the secondary extraction line 2 is preferably connected to the high-pressure turbine cylinder 10 through a second line 92.
The embodiment also provides a comprehensive efficiency improving method for integrating the steam turbine body and the heat regenerative system under the steam parameter improving condition, which is implemented by adopting the efficiency improving system and comprises the following steps:
the method comprises the following steps: and (3) efficiency improving system operation: steam generated by a boiler 9 firstly enters a steam turbine high-pressure cylinder 10, then enters a steam turbine intermediate-pressure cylinder 11 through a second pipeline 92, then enters a steam turbine low-pressure cylinder 12 through a third pipeline 93, and finally enters a condenser 13 to be cooled into condensed water, and the condensed water is subjected to pressure boosting through a condensed water pump 14, then sequentially passes through a 8# low-pressure heater 23, a 7# low-pressure heater 22, a 6# low-pressure heater 21, a 5# low-pressure heater 20, a deaerator 19, a water feed pump 18, a 3# high-pressure heater 17, a 2# high-pressure heater 16 and a 1# high-pressure heater 15 to be heated, and then enters the boiler 9;
step two: steam in the steam turbine body is pumped into the corresponding heaters and deaerators through an air pumping pipeline, drain water generated after the steam in the three high-pressure heaters is cooled finally enters the deaerator 19, and drain water generated after the steam in the four low-pressure heaters is cooled finally enters the condenser 13;
step three: the steam parameters of the steam turbine body are improved, the steam inlet parameters and the steam inlet quantity of each heater and the deaerator correspondingly change, and the actual operation effect of each heater and the deaerator is checked;
step four: if the heat exchange area of the heater cannot meet the heat exchange requirement after the steam parameters are improved, steam extraction parameter optimization is required;
step five: and optimizing steam extraction parameters until the heat exchange capacity requirement of each heater is matched with the actual heat exchange effect of the heater.
The efficiency improving system gives full play to the heat exchange capacity of the existing heater, quantitatively calculates the influence of steam extraction parameter optimization on the heat consumption rate of the steam turbine, and comprehensively evaluates the steam extraction parameter optimization effect. The steam turbine body and the integrated comprehensive efficiency improvement technology of the heat recovery system optimize and adjust steam extraction parameters of each section, take heat exchange performance of a heater into consideration under the condition that heat consumption rate of the steam turbine is kept basically unchanged, improve heat exchange effect of the heat recovery system, and optimize and match the principle as follows: (1) maintaining the heat consumption rate of the steam turbine basically unchanged; (2) the existing heat exchange capacity of the heater is fully utilized, and the replacement number of the heater is reduced; (3) the feed water temperature meets the requirements.
The research on the integrated comprehensive efficiency improving method of the steam turbine body and the heat regenerative system under the steam parameter improving condition mainly comprises the following aspects:
(1) and (3) analyzing the influence of steam parameter promotion on a steam turbine body and a regenerative steam extraction system: the temperature of main steam and reheat steam of a subcritical unit is increased, and the influence range of equipment needs to be analyzed, the economic performance of parameter improvement is calculated and analyzed, the economic benefit is comprehensively evaluated, and the like;
(2) calculating and analyzing and evaluating the heat exchange capacity of the steam extraction regenerative system: after steam parameters of the steam turbine are improved, the steam inlet temperature and the steam inlet flow of each heater are changed, and whether the existing heat exchange area can meet the requirements or not is further checked. Calculating and analyzing the actual operation effect of the heater by combining the unit operation data, comparing and analyzing the actual operation effect and the requirement of the heat exchange amount after transformation, and evaluating whether the heat exchange capacity of each heater meets the requirement after through-flow transformation;
(3) comprehensively considering the heat consumption rate of the steam turbine and the current situation of a regenerative steam extraction system, carrying out integrated comprehensive efficiency improvement system technical research on the steam turbine and the steam extraction system: after the steam parameters are improved, the parameters of each steam extraction section are changed, and in order to enable the water supply temperature to meet the design requirements, the steam extraction amount of each section is correspondingly adjusted. The research combines the actual heat exchange capacity of each stage of heater, and selects the most appropriate steam inlet parameter for each stage of heater by optimally designing the technical measures of the steam extraction flow rate, the steam extraction temperature and the like of each stage of heater, so that the steam heat exchange section, the drainage heat exchange section and the overall heat exchange quantity of each stage of heater are matched with the actual heat exchange capacity of the heater. The calculation example results show that the optimization design research can reduce the design heat consumption rate of the steam turbine, fully utilize the existing heat exchange capacity of the heater, reduce the replacement number of the heater and enable the water supply temperature to meet the requirements;
(4) the steam turbine and the steam extraction system are integrated to comprehensively improve the efficiency of the system to analyze the economic efficiency of the unit: the influence of the integrated comprehensive efficiency improvement technology on the economy of the unit is reflected in the aspects of water supply temperature, heater replacement cost reduction, heat consumption rate reduction and the like. After the steam extraction system of the steam turbine is optimized, the extraction flow of each section changes, and the change of the extraction parameters can influence the heat rate value of the steam turbine and needs quantitative calculation and analysis.
The effect improving system and method disclosed in the embodiment have wide application prospects to the following units: (1) implementing steam parameter lifting and modifying of the unit; (2) implementing through-flow modification of the unit by the steam turbine; (3) the unit with large energy-saving potential of the regenerative steam extraction system can implement relevant optimization work. With the increase of the operation time of domestic 300MW and 600MW grade subcritical units, the problems of equipment aging, increased operation coal consumption, reduced equipment safety and reliability and the like are faced. The research work comprehensively considers the integration of the steam turbine body and the regenerative system, is the optimization and integration of energy-saving reconstruction projects, belongs to the category of deep energy saving, provides a new idea for energy-saving efficiency improvement reconstruction of a power plant, and has wide development prospects. The project improves the economic efficiency of unit operation, generates good environmental protection benefit and social benefit, and is a positive response to national relevant policies.
The example application analysis was performed as follows:
the analysis of the embodiment is carried out by taking a 330MW subcritical unit of a certain domestic power plant as an example, the model of a steam turbine of the unit is N330-16.7/537/537, a total 8-stage steam extraction heat recovery system is provided with three high-pressure heaters, one deaerator and four low-pressure heaters, the equipment is installed and named by numbers according to the structural schematic diagram of the embodiment, and the 1# high-pressure heater 15, the 2# high-pressure heater 16, the 3# high-pressure heater 17, the water feed pump 18, the deaerator 19, the 5# low-pressure heater 20, the 6# low-pressure heater 21, the 7# low-pressure heater 22 and the 8# low-pressure heater 23 are used for carrying.
After steam parameters are improved, the steam inlet temperature and flow of each heater are obviously changed, and the steam inlet pressure of each heater is not obviously changed. Because the steam inlet parameters and the steam inlet quantity of each heater are correspondingly changed, whether the existing heat exchange area can meet the requirements or not can be further checked.
And (3) calculating and analyzing the actual operation effect of the heater, wherein the calculation result shows that: the heat exchange areas of the 1# high-pressure heater 15, the 5# low-pressure heater 20 and the 8# low-pressure heater 23 can meet the heat exchange requirements after the parameters are improved; the heat exchange areas of the 2# high-pressure heater 16, the 3# high-pressure heater 17, the 6# low-pressure heater 21 and the 7# low-pressure heater 22 cannot meet the heat exchange requirement after the parameters are improved, and steam extraction parameter optimization is needed.
And (4) optimizing the steam source of the No. 3 high-pressure heater 17, and adjusting the steam inlet flow of each stage of heater. After the steam extraction parameters are optimized, the heat exchange capacity requirement of the heater is matched with the actual heat exchange effect of the heater. The heat exchange amount of each heater is 96.41-103.19% of the actual operation value, and the current heat exchange capacity of the heater is met; the actual heat exchange capacities of the 2# high-pressure heater 16, the 6# low-pressure heater 21 and the 7# low-pressure heater 22 are 87.34%, 89.57% and 88.56% of the design values, the heat exchange levels of the 2# high-pressure heater 16, the 6# low-pressure heater 21 and the 7# low-pressure heater 22 are improved by measures such as maintenance and efficiency improvement and the like by more than 3%, and the heat exchange capacities are matched with the heat exchange capacities of the heaters after steam extraction parameter optimization.
Through the comparative analysis before and after the optimization design of the steam extraction parameters of the unit, the economic type of the optimization of the steam extraction parameters of the unit is mainly reflected in the following aspects:
(1) the steam extraction parameters of the unit are optimized, the heat consumption rate of the steam turbine is reduced by 13.98 kJ/(kW.h) through the optimization design of the steam extraction amount, the water supply temperature of the unit is reduced by 0.20 ℃, the influence on the heat consumption rate of the steam turbine is obtained by calculation and is 0.59 kJ/(kWh.h), and the heat consumption rate of the steam turbine is reduced by 13.39 kJ/(kWh.h) through the optimization of the steam extraction parameters by comprehensively considering the factors. Calculating according to the annual utilization hours of the unit of 4500 and the standard coal unit price of 600 yuan, and optimizing steam extraction parameters can save 757 tons of standard coal every year and the annual operation economic benefit is about 45 ten thousand yuan;
(2) before the steam parameters of the unit are optimized, the heat exchange area needs to be increased or the heaters need to be replaced for the 2# high-pressure heater 16, the 3# high-pressure heater 17, the 6# low-pressure heater 21 and the 7# low-pressure heater 22, after the steam parameters are optimized, the heaters do not need to be replaced by reasonably distributing all levels of steam extraction parameters, and the replacement cost of the heaters is saved by only 600 ten thousand yuan.
The subcritical steam turbine body and the heat recovery system are integrated into a comprehensive efficiency improving system based on steam parameter improvement, the heat consumption rate of a steam turbine, the heat exchange capacity of a heater, project investment and other factors are analyzed, the existing capacity of the heater is fully exerted, the heat consumption rate of the steam turbine is reduced, the improvement investment is reduced, the steam extraction parameter is optimized and designed on the basis of the steam parameter improvement and improvement project, the optimization and integration of the energy-saving improvement project are realized, the deep energy-saving category is realized, and a new idea is provided for the energy-saving efficiency improvement and improvement of a power plant.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (2)
1. The utility model provides a steam turbine body and integrated comprehensive efficiency improving system of backheat system under steam parameter promotes condition which characterized in that: the steam turbine steam generator comprises a boiler (9), a steam turbine high-pressure cylinder (10), a steam turbine intermediate-pressure cylinder (11), a steam turbine low-pressure cylinder (12), a condenser (13), a condensate pump (14), a first-stage air extraction pipeline (1), a second-stage air extraction pipeline (2), a third-stage air extraction pipeline (3), a fourth-stage air extraction pipeline (4), a fifth-stage air extraction pipeline (5), a sixth-stage air extraction pipeline (6), a seventh-stage air extraction pipeline (7), an eight-stage air extraction pipeline (8), a 1# high-pressure heater (15), a 2# high-pressure heater (16), a 3# high-pressure heater (17), a water feed pump (18), a deaerator (19), a 5# low-pressure heater (20), a 6# low-pressure heater (21), a;
the boiler (9) is provided with a feed water inlet and a steam outlet, the steam outlet is connected with the high-pressure turbine cylinder (10) through a first pipeline (91), and the steam enters the high-pressure turbine cylinder (10) through the first pipeline (91), works through the high-pressure turbine cylinder (10), and then enters the medium-pressure turbine cylinder (11) through a second pipeline (92); one end of the second pipeline (92) is connected with the high-pressure turbine cylinder (10), the other end of the second pipeline is connected with the medium-pressure turbine cylinder (11), and the second pipeline (92) penetrates through the boiler (9); the steam turbine medium pressure cylinder (11) is connected with the steam turbine low pressure cylinder (12) through a third pipeline (93), and the steam turbine low pressure cylinder (12) is connected with the condenser (13) through a fourth pipeline (94); the condenser (13) is connected with the water inlet end of the No. 8 low-pressure heater (23) through a No. five pipeline (95), and the condensate pump (14) is installed on the No. five pipeline (95);
the water outlet end of the 8# low-pressure heater (23) is communicated with the water inlet end of the 7# low-pressure heater (22), the water outlet end of the 7# low-pressure heater (22) is communicated with the water inlet end of the 6# low-pressure heater (21), the water outlet end of the 6# low-pressure heater (21) is communicated with the water inlet end of the 5# low-pressure heater (20), the water outlet end of the 5# low-pressure heater (20) is communicated with the water inlet end of the deaerator (19), the water outlet end of the deaerator (19) is communicated with the water inlet end of the water feed pump (18), the water outlet end of the water feed pump (18) is communicated with the water inlet end of the 3# high-pressure heater (17), the water outlet end of the 3# high-pressure heater (17) is communicated with the water inlet end of the 2# high-pressure heater (16), the water outlet end of the 2# high-pressure heater (16) is communicated with the water inlet end of the 1# high-pressure heater (;
the bottoms of the 1# high-pressure heater (15), the 2# high-pressure heater (16), the 3# high-pressure heater (17), the 5# low-pressure heater (20), the 6# low-pressure heater (21), the 7# low-pressure heater (22) and the 8# low-pressure heater (23) are provided with drainage outlets;
a drainage outlet at the bottom of the 1# high-pressure heater (15) is communicated with a 2# high-pressure heater (16), a drainage outlet at the bottom of the 2# high-pressure heater (16) is communicated with a 3# high-pressure heater (17), and a drainage outlet at the bottom of the 3# high-pressure heater (17) is communicated with a deaerator (19);
the drain outlet at the bottom of the 5# low-pressure heater (20) is communicated with a 6# low-pressure heater (21), the drain outlet at the bottom of the 6# low-pressure heater (21) is communicated with a 7# low-pressure heater (22), the drain outlet at the bottom of the 7# low-pressure heater (22) is communicated with an 8# low-pressure heater (23), and the drain outlet at the bottom of the 8# low-pressure heater (23) is communicated with a condenser (13);
two ends of the first-stage air extraction pipeline (1) are respectively connected with a steam turbine high-pressure cylinder (10) and a No. 1 high-pressure heater (15); two ends of the secondary air extraction pipeline (2) are respectively connected with a steam turbine high-pressure cylinder (10) and a No. 2 high-pressure heater (16); two ends of the three-stage air extraction pipeline (3) are respectively connected with a steam turbine intermediate pressure cylinder (11) and a # 3 high pressure heater (17); two ends of the four-stage air extraction pipeline (4) are respectively connected with a steam turbine intermediate pressure cylinder (11) and a deaerator (19); two ends of the five-stage extraction pipeline (5) are respectively connected with a steam turbine low-pressure cylinder (12) and a No. 5 low-pressure heater (20); two ends of the six-stage extraction pipeline (6) are respectively connected with a steam turbine low-pressure cylinder (12) and a No. 6 low-pressure heater (21); two ends of the seven-stage extraction pipeline (7) are respectively connected with a steam turbine low-pressure cylinder (12) and a 7# low-pressure heater (22); and two ends of the eight-stage extraction pipeline (8) are respectively connected with a steam turbine low-pressure cylinder (12) and an 8# low-pressure heater (23).
2. The steam turbine body and heat recovery system integrated comprehensive efficiency improvement system under the steam parameter improvement condition according to claim 1, characterized in that: and the secondary air extraction pipeline (2) is communicated with the high-pressure cylinder (10) of the steam turbine through a second pipeline (92).
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