阅读说明：本技术 一种蒸汽参数提升条件下汽轮机本体和回热系统集成综合提效系统及方法 (Steam turbine body and heat recovery system integrated comprehensive efficiency improving system and method under steam parameter improving condition ) 是由 崔传涛 王学栋 蒋叶辉 张东兴 郑惠 于 2020-04-09 设计创作，主要内容包括：本发明涉及一种蒸汽参数提升条件下汽轮机本体和回热系统集成综合提效系统及方法,提效系统包括锅炉、汽轮机高压缸、汽轮机中压缸、汽轮机低压缸、凝汽器、凝结水泵、给水泵、一级抽气管路、二级抽气管路、三级抽气管路、四级抽气管路、五级抽气管路、六级抽气管路、七级抽气管路、八级抽气管路、1#高压加热器、2#高压加热器、3#高压加热器、除氧器、5#低压加热器、6#低压加热器、7#低压加热器和8#低压加热器；蒸汽依次经汽轮机高压缸、汽轮机中压缸、汽轮机低压缸后进入到凝汽器冷凝成水,本提效系统是节能技术的新发展；汽轮机本体蒸汽参数提升后,通过优化各级抽气参数而使各级加热器满足换热能力,避免或减少加热器更换数量,降低改造费用。(The invention relates to a steam turbine body and a heat recovery system integrated comprehensive efficiency improving system and method under a steam parameter improving condition, wherein the efficiency improving system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure 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 eighth-stage air extraction pipeline, a No. 1 high-pressure heater, a No. 2 high-pressure heater, a No. 3 high-pressure heater, a deaerator, a No. 5 low-pressure heater; 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 efficiency improving 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.)

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).

3. An integrated comprehensive efficiency improving method for a steam turbine body and a heat recovery system under the steam parameter improving condition is implemented by adopting the efficiency improving system of any one of claims 1-2, and is 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 (9) firstly enters a turbine high-pressure cylinder (10), then enters a turbine intermediate-pressure cylinder (11) through a second pipeline (92), then enters a turbine low-pressure cylinder (12) through a third pipeline (93), 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 deaerators (19), and drain water generated after the steam in the four low-pressure heaters is cooled finally enters the condensers (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 calculated and analyzed;

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.

Technical Field

The invention relates to the field of coal-fired power generation, in particular to a steam turbine body and regenerative system integrated comprehensive efficiency improving system and method under the condition of steam parameter improvement.

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.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a comprehensive efficiency improving system integrating a steam turbine body and a regenerative system under the condition of steam parameter improvement with reasonable structural design, and provides an efficiency improving method thereof.

The technical scheme adopted by the invention for solving the problems is as follows: 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 invention also provides a steam turbine body and regenerative system integrated comprehensive efficiency improving method under the steam parameter improving condition, which is implemented by adopting the efficiency improving system and is 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 invention has the following advantages and effects:

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 inventive effort.

Fig. 1 is a schematic structural diagram of a performance improvement 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 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.