CN112682115B - High back pressure transformation method based on extraction condensing turbine - Google Patents
High back pressure transformation method based on extraction condensing turbine Download PDFInfo
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- CN112682115B CN112682115B CN202011508527.7A CN202011508527A CN112682115B CN 112682115 B CN112682115 B CN 112682115B CN 202011508527 A CN202011508527 A CN 202011508527A CN 112682115 B CN112682115 B CN 112682115B
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Abstract
The invention discloses a high back pressure modification method based on an extraction and condensation turbine, which belongs to the technical field of high back pressure modification based on the extraction and condensation turbine and comprises the following steps: (1) According to the backpressure steam parameters, processing and cutting the rotor blades with corresponding stages on the extraction steam turbine to a blade intermediate body; (2) taking the clapboard steam seal ring as a back steam seal for back pressure modification; (3) stopping the low-pressure heater; (4) Taking the original low pressure adding pipeline as a front gland sealing steam exhaust pipeline and a rear gland sealing steam exhaust pipeline of the backpressure unit; (5) Setting a start-stop emptying system, and supplementing water to the front of the steam seal cooler; (6) And (4) stopping the condenser, and using the on-machine cooling water for supplying the oil cooler and the cooling water of the generator air cooler. The invention has the advantages of small modification range, short period and high equipment utilization rate, and compared with the traditional backpressure modification and replacement equipment and parts, the invention can greatly shorten the construction period, reduce the cost and has higher cost performance.
Description
Technical Field
The invention relates to the technical field of high back pressure modification based on an extraction and condensation turbine, in particular to a high back pressure modification method based on an extraction and condensation turbine.
Background
The extraction steam turbine backpressure modification is a steam supply modification technology for providing steam with corresponding parameters and reserving a certain power supply amount under the policy of 'high pressure and low pressure' of the state of a coal-fired unit. With the development of urban economy and the optimization of environment, the increase of urban winter central heating and industrial steam demand, the heat source storage and heating capacity of a plurality of self-contained power plants need to be increased urgently, the heat load of the central heating is further improved year by year, and the heating capacity increase or the change of a pure generator set into a backpressure unit also becomes a great development trend.
In order to improve the self operation condition of an enterprise, reduce the cost and reduce the impact of the fault of a steam turbine unit on the normal production and operation activities of the enterprise, the backpressure is adopted to be transformed simply and conveniently under the condition that the equipment of the existing factory building and the peripheral system of a host is not changed as much as possible, the operation and maintenance are convenient, the backpressure of the steam turbine with high operation efficiency is transformed into a general optimal choice, the power plant not only reduces the capital investment, but also increases the utilization rate of the equipment.
The back pressure modification of a general extraction condensing or straight condensing unit needs preparation work such as prefabricating a blank, balancing a rotor, modifying a cylinder on a large scale when the unit is stopped, the modification period is long, the unit is stopped for a long time, the operation and labor loss of the unit are caused, and the benefit requirement of enterprise modification is not met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high back pressure modification method based on an extraction condensing turbine; the high back pressure modification method based on the condensing turbine is specially designed for high back pressure modification, the modification range is small, the period is short, the utilization rate of equipment is high, and compared with the traditional back pressure modification and replacement of equipment and parts, the high back pressure modification method based on the condensing turbine can greatly shorten the construction period, reduce the cost and improve the cost performance.
In order to solve the technical problems, the invention provides a high back pressure modification method based on an extraction condensing turbine, which comprises the following steps:
(1) Determining the number of rotor stages according to the backpressure steam parameters, and machining and cutting the rotor blades with the corresponding number of stages on the extraction and condensation turbine to a blade intermediate body;
(2) Machining a partition plate on the extraction steam turbine to form a mounting groove, welding an upper blocking plate in the mounting groove, and taking a partition plate steam seal ring as a back steam seal for back pressure modification;
(3) Stopping running the low-pressure heater, and keeping the high-pressure heater and the deaerator to form a heat regenerative system of the backpressure unit;
(4) Taking the original low pressure adding pipeline as a front gland sealing steam exhaust pipeline and a rear gland sealing steam exhaust pipeline of the backpressure unit;
(5) Setting a start-stop emptying system, and supplementing water to the front of the steam seal cooler;
(6) And (4) stopping the condenser, and using the on-machine cooling water for supplying the oil cooler and the cooling water of the generator air cooler.
Compared with the prior art, the invention has the following beneficial effects:
the invention does not need preparation work such as prefabricated blank, rotor counterweight, large-scale transformation of a cylinder and the like, can transform the steam extraction and condensation turbine into a high-back-pressure unit by transforming the rotor structure, changing the air passage and changing some pipelines and external equipment on the basis of the original structure, has small transformation range, short period and high equipment utilization rate, and can greatly shorten the construction period, reduce the cost and improve the cost performance compared with the traditional back-pressure transformation and replacement of equipment and parts.
Drawings
To more clearly illustrate the background art or the technical solutions of the present invention, the following brief description of the drawings incorporated in the prior art or the detailed description of the present invention; it should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is to be given the full breadth of the present disclosure, and are not intended to limit the scope of the present disclosure.
FIG. 1 is a schematic structural view of a rotor of a pre-reformed extraction condensing turbine.
Fig. 2 is a schematic view of a modified high back pressure rotor of the present invention.
Fig. 3 is a schematic view of the baffle steam passage modification of the present invention 1.
Fig. 4 is a schematic view of the baffle steam passage modification of the present invention 2.
FIG. 5 is a longitudinal sectional view of the condensing unit before modification.
FIG. 6 is a longitudinal sectional view of the back pressure unit of the present invention.
Shown in the figure: 1-a rotor; 2-rotor blades; 3-a leaf intermediate; 4-blocking plate; 5-clapboard steam sealing ring.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following will make clear and complete description of the technical solution in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.
Meanwhile, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like referred to in this specification refer to the orientation or positional relationship indicated on the drawings, which is merely for convenience of description and simplification of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, it is not to be understood as a limitation of the present invention, and a change or adjustment of the relative relationship thereof, without substantial technical change, should also be considered as the scope in which the present invention can be implemented.
Meanwhile, in the description of the present specification, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected", and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other, so that the specific meaning of the terms in the invention can be understood by those skilled in the art through specific situations.
As shown in fig. 1 to 6, a high back pressure modification method based on an extraction steam turbine includes the following steps:
(1) Determining the number of rotor stages according to the backpressure steam parameters, and machining and cutting the rotor blades with the corresponding number of stages on the extraction and condensation turbine to a blade intermediate body;
(2) Machining a partition plate on the extraction steam turbine to form a mounting groove, welding an upper blocking plate in the mounting groove, and taking a partition plate steam seal ring as a back steam seal for back pressure modification;
(3) Stopping running the low-pressure heater, and keeping the high-pressure heater and the deaerator to form a heat return system of the backpressure unit;
(4) The original low pressure adding pipeline is used as a front steam seal steam exhaust pipeline and a rear steam seal steam exhaust pipeline of the backpressure unit;
(5) Setting a start-stop emptying system, and supplementing water to the front of the steam seal cooler;
(6) And (4) stopping the condenser, and using the on-machine cooling water for supplying the oil cooler and the cooling water of the generator air cooler.
(1) And optimally designing the rotor sleeve.
The original set is a condensing set, the number of stages of the rotor is determined according to backpressure steam parameters, the corresponding number of stages of the rotor is reserved, redundant rotors of an old rotor are processed to a blade intermediate body, the weight distribution and the thrust of the rotor are kept qualified to the maximum extent, and the critical rotating speed meets the standard requirements, as shown in figures 1 and 2.
(2) And (4) carrying out clapboard type rear steam sealing.
The steam passage of the original partition plate is plugged, and the steam seal ring of the partition plate is used as a back steam seal for backpressure modification, so that the original sleeve is fully utilized, the order cycle of the cast parts is avoided, and the construction period is shortened; as shown in fig. 3 and 4.
(3) And (5) optimizing the thermodynamic system.
The regenerative system of the extraction condensing unit comprises a high-pressure heater, a deaerator and a low-pressure heater; after the backpressure is improved, the backpressure exhaust steam pressure is increased, the low-pressure heater stops running, and a heat recovery system of the unit is changed into a high-pressure heater and a deaerator; in the transformation process, the original low-pressure water supply pipeline is used as a front steam seal steam exhaust pipeline and a rear steam seal steam exhaust pipeline, the low-pressure water supply side operates, the waste heat of the steam seal is fully utilized, and the efficiency is improved.
After the unit is transformed into a backpressure unit from extraction and condensation, a thermodynamic system is correspondingly changed, and the low-pressure heater (low-pressure heater) water side operates; after the unit is changed into a backpressure unit, a start-stop emptying system is arranged, water is supplemented to the front of a steam seal cooler, and waste heat is fully utilized; and after the back pressure is changed into the back pressure, the condenser is stopped, and the oil cooler and the cooling water of the generator air cooler are cooled by using on-machine cooling water.
1. Because the project is a reconstruction project, the system pipeline can use the original system pipeline as much as possible, and the pipeline can be properly modified according to the actual situation on site.
2. The hydrophobic points which are not used in the hydrophobic system are blocked, and the newly-added hydrophobic point hydrophobic valve uses the hydrophobic valve which is not used in the original system.
3. In the application, the water replenishing device, the water feeding device, the deaerator and the like are designed as a single machine, if the single machine is operated as a main control on site, a user can make corresponding modification according to the actual site.
4. The pipelines for removing the water and the steam to the condenser in the original system are modified according to the actual situation on site, the water is drained to a whole plant water drainage system in principle, and the non-recovered steam is connected to the outside of a plant.
5. To prevent the rear cylinder from over-temperature, the rear cylinder water injection system must be maintained.
6. The valve plates of the original JD3 and JD2 steam extraction check valves of the thermodynamic systems can be disassembled so as to prevent the steam extraction check valves from being too small in front and back pressure difference to be opened.
7. The pressure in the low-pressure heater is about atmospheric pressure, the pressure difference between three low-pressure water adding stages is small, the low-pressure water adding drainage is changed into low-pressure water adding individual drainage from gradual self-flow, and the distance between a drainage outlet and the low water adding stage is required to be more than 1 m.
8. In order to ensure the cooling effect of the low-pressure heater, non-condensed steam in the low-pressure heater needs to be exhausted, an air valve of the low-pressure heater is opened when the low-pressure heater is put into operation, and the low-pressure heater is closed when steam exists.
Although the present invention has been described in detail with reference to the preferred embodiments and the accompanying drawings, the present invention is not limited thereto, and those skilled in the art can make various equivalent modifications or substitutions on the embodiments of the present invention without departing from the spirit and scope of the present invention, and those modifications or substitutions should be considered as being within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and therefore, the scope of the present invention should be determined by the scope of the appended claims.
Claims (1)
1. A high back pressure transformation method based on an extraction condensing turbine is characterized in that: the method comprises the following steps:
(1) Determining the number of rotor stages according to the backpressure steam parameters, and machining and cutting the rotor blades with the corresponding number of stages on the extraction steam turbine to a blade intermediate body;
(2) Machining a partition plate on the extraction steam turbine to form a mounting groove, welding an upper blocking plate in the mounting groove, and taking a partition plate steam seal ring as a back steam seal for backpressure modification;
(3) Stopping running the low-pressure heater, and keeping the high-pressure heater and the deaerator to form a heat return system of the backpressure unit;
(4) The original low-pressure-adding pipeline is used as a front steam seal steam exhaust pipeline and a rear steam seal steam exhaust pipeline of the backpressure unit, the low-pressure-adding side operates, the waste heat of the steam seal is fully utilized, and the efficiency is improved;
(5) Setting a start-stop emptying system, and supplementing water to the front of the steam seal cooler;
(6) And (4) stopping the condenser, and using the on-machine cooling water for supplying the oil cooler and the cooling water of the generator air cooler.
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| JP2001336428A (en) * | 2000-05-26 | 2001-12-07 | Ishikawajima Harima Heavy Ind Co Ltd | Gas turbine power generation apparatus |
| CN103670547A (en) * | 2013-12-11 | 2014-03-26 | 东方电气集团东方汽轮机有限公司 | Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset |
| CN110821585A (en) * | 2019-11-27 | 2020-02-21 | 国电电力发展股份有限公司大连开发区热电厂 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
| CN111706411A (en) * | 2020-07-22 | 2020-09-25 | 西安西热节能技术有限公司 | Thermodynamic system for transforming back pressure unit into extraction condensing unit and working method |
| CN112081635A (en) * | 2020-08-06 | 2020-12-15 | 北京龙威发电技术有限公司 | Method and system for eliminating blowing phenomenon of steam turbine intermediate pressure cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108644860B (en) * | 2018-04-19 | 2023-06-30 | 北京智为蓝科技有限公司 | Exhaust steam waste heat recovery heat supply system of air cooling unit of large-scale thermal power plant |
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|---|---|---|---|---|
| JP2001336428A (en) * | 2000-05-26 | 2001-12-07 | Ishikawajima Harima Heavy Ind Co Ltd | Gas turbine power generation apparatus |
| CN103670547A (en) * | 2013-12-11 | 2014-03-26 | 东方电气集团东方汽轮机有限公司 | Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset |
| CN110821585A (en) * | 2019-11-27 | 2020-02-21 | 国电电力发展股份有限公司大连开发区热电厂 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
| CN111706411A (en) * | 2020-07-22 | 2020-09-25 | 西安西热节能技术有限公司 | Thermodynamic system for transforming back pressure unit into extraction condensing unit and working method |
| CN112081635A (en) * | 2020-08-06 | 2020-12-15 | 北京龙威发电技术有限公司 | Method and system for eliminating blowing phenomenon of steam turbine intermediate pressure cylinder |
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