CN114017844A - Exhaust steam injection backflow backpressure unit small-flow heat supply system and method - Google Patents
Exhaust steam injection backflow backpressure unit small-flow heat supply system and method Download PDFInfo
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- CN114017844A CN114017844A CN202111343051.0A CN202111343051A CN114017844A CN 114017844 A CN114017844 A CN 114017844A CN 202111343051 A CN202111343051 A CN 202111343051A CN 114017844 A CN114017844 A CN 114017844A
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000001172 regenerating effect Effects 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/02—Steam central heating systems operating with live steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a backpressure unit small-flow heat supply system and a backpressure unit small-flow heat supply method for exhaust steam injection backflow. Compared with the existing system, when the heat supply demand is small, the original backpressure heat supply turbine can still be kept to enter steam at the designed flow, the flow of the exhausted steam of the backpressure heat supply turbine to the steam inlet pipeline of the injection converging device is regulated, the flow of the steam supply main pipe of an industrial user is controlled to meet the user demand value, and the redundant exhausted steam of the backpressure unit overflows to the injection converging device. When the heat supply demand is higher, the evaporation capacity of the boiler can be improved, and meanwhile, the steam inlet of the injection converging device is reduced by reducing the opening degree of a flow regulating valve for discharging steam of the backpressure heat supply steam turbine to a steam inlet pipeline of the injection converging device, so that the flow of a steam supply main pipe of an industrial user is met, and the user demand value is met.
Description
Technical Field
The invention belongs to the field of steam turbine power generation, and particularly relates to a low-flow heat supply system and method of a back pressure unit for exhaust steam injection backflow.
Background
In order to meet the heat supply requirements of industrial users, a certain number of small back pressure heat supply units with a certain scale are put into production in industrial parks of various regions in China. The method is limited by the influence of various internal and external factors such as inadequate preferential policies such as small utilization time of local government heat supply units, failure to achieve planning expectation or slow construction progress in enterprises, and the like, and the phenomena that the long-term planning and actual deviation of the existing work area heat supply is large and the heat load is seriously inferior to the expectation are often caused. This will result in the back pressure heating unit not reaching the design capacity after being put into operation, and the heating capacity is not matched with the heat demand of the regional heat user. After the heating period is finished, the heat supply demand is reduced sharply, the backpressure heat supply unit cannot meet the technical requirement of the lowest heat supply flow under the restriction of steam turbine exhaust blowing factors, the backpressure heat supply unit can only be in a shutdown state, a small amount of industrial steam is directly supplied to a heat user through temperature reduction and pressure reduction of a boiler, and high-quality heat loss can be caused. On the other hand, the shutdown of the steam turbine unit causes a large gap in service power, which results in that a large amount of expensive external network electric quantity needs to be purchased in a monthly heat power plant, and the profitability of the heat power plant is seriously affected. Therefore, the system optimization transformation is carried out on the existing small-sized back pressure heat supply unit, the problem of electricity consumption and supply in unit operation plants when the heat supply load is insufficient is solved, and the system has great significance for improving the annual operation economy of the cogeneration unit.
Disclosure of Invention
The invention aims to overcome the defects and provides a low-flow heat supply system and a low-flow heat supply method for a backpressure unit with exhaust steam injection backflow, which can effectively solve the problem of power consumption and supply of a plant when the heat supply load is low.
In order to achieve the aim, the low-flow heating system of the back pressure unit for exhaust steam injection backflow comprises a back pressure heating steam turbine, an injection confluence device and a 1.5 th high-pressure heater;
the steam inlet of the backpressure heat supply steam turbine is connected with the boiler through a pipeline, the backpressure heat supply steam turbine is provided with medium-pressure steam extraction, part of the medium-pressure steam extraction shunted by the backpressure heat supply steam turbine is connected with the injection confluence device through a backpressure machine steam exhaust pipeline, the steam exhaust of the backpressure heat supply steam turbine is connected with the steam inlet pipeline of the injection confluence device through a pipeline, the backpressure heat supply steam turbine is provided with a first-stage regenerative steam extraction port, the first-stage regenerative steam extraction port is connected with a first-stage high-pressure heater through a pipeline, the steam exhaust of the backpressure heat supply steam turbine is respectively connected with a second-stage regenerative steam extraction port, a deaerator steam extraction port and an industrial user steam supply main pipe, the second-stage regenerative steam extraction port is connected with a deaerator, the deaerator steam extraction port is connected with a 1.5-stage heater and an injection confluence device outlet steam pipeline, and the generator is connected with the backpressure heat supply steam turbine.
A hydraulic control flow regulating valve is arranged on the steam inlet pipeline of the injection confluence device.
A seat cylinder valve is arranged behind a medium-pressure steam extraction port of the backpressure heat supply steam turbine.
The industrial user supplies heat for the steam of the steam main pipe.
The medium-pressure extracted steam is used as a primary driving steam source of the injection converging device, and the partial medium-pressure extracted steam of the split flow of the backpressure heat supply steam turbine is used as a secondary steam source driven by the injection converging device.
And a hydraulic flow regulating valve is arranged on a connecting pipeline of the backpressure heat supply steam turbine and the injection converging device.
A working method of a low-flow heat supply system of a backpressure unit with exhaust steam injection backflow comprises the following steps:
when the heat supply demand is small, the boiler evaporation capacity is high, the original backpressure heat supply steam turbine is kept to enter steam at the designed flow, the flow of the steam exhausted from the backpressure heat supply steam turbine to the injection converging device is adjusted, the flow of a steam supply main pipe of an industrial user is controlled to meet the user demand value, the surplus steam exhausted from the backpressure unit overflows to the injection converging device, the medium-pressure steam is extracted to inject, suck, converge and the mixed steam is introduced into a 1.5-level heater to carry out system heat regeneration.
The flow of the exhaust steam of the backpressure heat supply steam turbine to the injection confluence device is adjusted by controlling the opening of the hydraulic flow regulating valve.
Compared with the prior art, the invention utilizes the original back pressure heat supply steam turbine exhaust steam, and adds an injection confluence device to reflux the exhaust steam. Compared with the existing system, when the heat supply demand is small, the original backpressure heat supply turbine can still be kept to enter steam at the designed flow, the flow of the exhausted steam of the backpressure heat supply turbine to the steam inlet pipeline of the injection converging device is regulated, the flow of the steam supply main pipe of an industrial user is controlled to meet the user demand value, and the redundant exhausted steam of the backpressure unit overflows to the injection converging device. When the heat supply demand is higher, the evaporation capacity of the boiler can be improved, and meanwhile, the steam inlet of the injection converging device is reduced by reducing the opening degree of a flow regulating valve for discharging steam of the backpressure heat supply steam turbine to a steam inlet pipeline of the injection converging device, so that the flow of a steam supply main pipe of an industrial user is met, and the user demand value is met. Newly-increased 1.5 th level heater draws the steam after the device of converging blends through consuming to draw, can promote the unit feedwater temperature degree, can greatly degree promote the combined heat and power generation unit and move economic nature throughout the year.
Drawings
Fig. 1 is a thermodynamic system of the invention, in which a small backpressure unit is transformed into a condensing unit.
The system comprises a boiler 1, a boiler 2, a back pressure heat supply steam turbine 3, a medium pressure steam extraction pipeline 4, a cylinder valve 5, a first-stage regenerative steam extraction port 6, a first-stage high-pressure heater 7, a second-stage regenerative steam extraction port 8, a second-stage high-pressure heater 9, a deaerator steam extraction port 10, a deaerator 11, an industrial user steam supply main pipe 12, a generator 13, an injection converging device 13, a 14, a hydraulic control flow regulating valve 15, a back pressure machine steam exhaust to injection converging device pipeline 16, medium pressure steam extraction to injection converging device pipeline 17, an injection converging device outlet steam pipeline 18, a 1.5 th-stage high-pressure heater 19, a water feed pump 20 and a condensate pump.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a low-flow heating system of a back pressure unit for exhaust steam injection reflux comprises a back pressure heating steam turbine 2, an injection confluence device 13 and a 1.5 th high-pressure heater 18.
The steam inlet of the backpressure heat supply steam turbine 2 is connected with the boiler 1 through a pipeline, the backpressure heat supply steam turbine 2 is provided with a medium-pressure steam extraction 3, and a seat cylinder valve 4 is arranged behind the medium-pressure steam extraction of the backpressure heat supply steam turbine 2. The part of the medium-pressure extraction steam 3 which is divided by the backpressure heat supply steam turbine 2 is connected with an injection converging device 13 through a backpressure machine steam exhaust to injection converging device pipeline 15, and a hydraulic control flow regulating valve 14 is arranged on a steam inlet pipeline of the injection converging device 13. The steam exhaust of the backpressure heat supply steam turbine 2 is connected with the steam inlet pipeline of the injection converging device 13 through a pipeline, the backpressure heat supply steam turbine 2 is provided with a first-stage backheating steam extraction port 5, the first-stage backheating steam extraction port 5 is connected with a first-stage high-pressure heater 6 through a pipeline, the steam exhaust of the backpressure heat supply steam turbine 2 is respectively connected with a second-stage backheating steam extraction port 7, a deaerator steam extraction port 9 and an industrial user steam supply main pipe 11, the second-stage backheating steam extraction port 7 is connected with a second high-pressure heater 8 and used for heating water supply, the deaerator steam extraction port 9 is connected with a deaerator 10 and used for supplying and deaerating water, a 1.5 th-stage heater 18 is connected with an injection converging device outlet steam pipeline 17, and the generator 12 is connected with the backpressure heat supply steam turbine 2. The industrial user supplies heat to the outside by the steam of the steam main pipe 11. The medium-pressure extraction steam 3 is used as a primary driving steam source of the injection converging device 13, and the part of the medium-pressure extraction steam branched by the backpressure heat supply steam turbine 2 is used as a secondary steam source driven by the injection converging device 13. A hydraulic flow regulating valve 14 is arranged on a connecting pipeline between the backpressure heat supply turbine 2 and the injection converging device 13. The stage 1.5 heater 18 consumes the steam blended by the ejector manifold 13 and is used to heat the feed water.
A working method of a low-flow heat supply system of a backpressure unit with exhaust steam injection backflow comprises the following steps: when the heat supply demand is smaller, the evaporation capacity of the boiler 1 can be kept high, the original backpressure heat supply steam turbine 2 is kept to enter steam at the designed flow, the flow of the exhausted steam of the backpressure heat supply steam turbine 2 to the injection converging device 13 is adjusted, the flow of the steam supply main pipe 11 of an industrial user is controlled to meet the user demand value, the exhausted steam of the redundant backpressure unit overflows to the injection converging device 13, the injection entrainment converging device is used for injecting entrainment converging steam through the medium-pressure extracted steam 3, and the steam mixed through the injection converging device 13 is introduced into the 1.5 th-stage heater 18 for system heat regeneration. The flow rate of the exhaust steam of the back pressure heat supply turbine 2 to the ejector confluence device 13 is adjusted by controlling the opening degree of the hydraulic flow rate adjustment valve 14.
In the working process, each regenerative heater in the thermodynamic system can be normally operated, the temperature of condensed water and feed water is improved, the Rankine cycle efficiency is improved, and the heat of working media is reduced
And (4) loss.
The invention effectively solves the problem of supplying the electricity consumption of the operating plant caused by forced shutdown of the small backpressure unit due to low heat supply load in non-heating seasons, and can greatly improve the annual operation economy of the cogeneration unit.
Claims (8)
1. A low-flow heating system of a backpressure unit for exhaust steam injection backflow is characterized by comprising a backpressure heating steam turbine (2), an injection confluence device (13) and a 1.5 th high-pressure heater (18);
the steam inlet of a backpressure heat supply steam turbine (2) is connected with a boiler (1) through a pipeline, the backpressure heat supply steam turbine (2) is provided with a medium-pressure steam extraction (3), part of the medium-pressure steam extraction (3) shunted by the backpressure heat supply steam turbine (2) is connected with an injection converging device (13) through a backpressure machine steam exhaust to injection converging device pipeline (15), the steam exhaust of the backpressure heat supply steam turbine (2) is connected with the steam inlet pipeline of the injection converging device (13) through a pipeline, the backpressure heat supply steam turbine (2) is provided with a first-stage regenerative steam extraction opening (5), the first-stage regenerative steam extraction opening (5) is connected with a first-stage high-pressure heater (6) through a pipeline, the steam exhaust of the backpressure heat supply steam turbine (2) is respectively connected with a second-stage regenerative steam extraction opening (7), a deaerator steam extraction opening (9) and an industrial user steam supply main pipe (11), the second-stage regenerative steam extraction opening (7) is connected with a second high-pressure heater (8), a deaerator steam extraction port (9) is connected with a deaerator (10), a 1.5 th-stage heater (18) is connected with an outlet steam pipeline (17) of the injection confluence device, and a generator (12) is connected with a back pressure heat supply steam turbine (2).
2. The low-flow heating system of the backpressure unit with exhaust steam injection backflow as claimed in claim 1, wherein a hydraulic control flow regulating valve (14) is arranged on a steam inlet pipeline of the injection confluence device (13).
3. The low-flow heating system of the backpressure unit with exhaust steam injection backflow as claimed in claim 1, wherein a cylinder valve (4) is arranged behind a medium-pressure steam extraction port of the backpressure heating steam turbine (2).
4. The low-flow heating system of the backpressure unit with exhaust steam injection backflow as claimed in claim 1, wherein steam of a steam supply main pipe (11) of an industrial user supplies heat to the outside.
5. The low-flow heating system of the backpressure unit with exhaust steam injection backflow, which is characterized in that the medium-pressure steam extraction (3) is used as a primary driving steam source of the injection confluence device (13), and the part of the medium-pressure steam extraction of the split flow of the backpressure heating steam turbine (2) is used as a secondary steam source driven by the injection confluence device (13).
6. The low-flow heating system of the backpressure unit with exhaust steam injection backflow as claimed in claim 1, wherein a hydraulic flow regulating valve (14) is arranged on a connecting pipeline between the backpressure heating turbine (2) and the injection confluence device (13).
7. The working method of the low-flow heating system of the back pressure unit for exhaust steam injection reflux disclosed by claim 1 is characterized by comprising the following steps of:
when the heat supply demand is small, the evaporation capacity of the boiler (1) is high, the original backpressure heat supply turbine (2) is kept to enter steam at the designed flow, the flow of the steam exhausted by the backpressure heat supply turbine (2) to the injection converging device (13) is adjusted, the flow of the industrial user steam supply main pipe (11) is controlled to meet the user demand value, the surplus steam exhausted by the backpressure unit overflows to the injection converging device (13), the injection entrainment converging device (3) is used for injecting entrainment converging, and the steam mixed by the injection converging device (13) is introduced into the 1.5-level heater (18) for system heat regeneration.
8. The operating method of the low-flow heating system of the backpressure unit with exhaust steam injection backflow as claimed in claim 1, wherein the flow of the exhaust steam of the backpressure heating turbine (2) to the injection confluence device (13) is adjusted by controlling the opening degree of the hydraulic flow regulating valve (14).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111343051.0A CN114017844A (en) | 2021-11-12 | 2021-11-12 | Exhaust steam injection backflow backpressure unit small-flow heat supply system and method |
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| CN202111343051.0A CN114017844A (en) | 2021-11-12 | 2021-11-12 | Exhaust steam injection backflow backpressure unit small-flow heat supply system and method |
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| CN202111343051.0A Pending CN114017844A (en) | 2021-11-12 | 2021-11-12 | Exhaust steam injection backflow backpressure unit small-flow heat supply system and method |
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|---|---|---|---|---|
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| CN204730303U (en) * | 2015-06-09 | 2015-10-28 | 西安交通大学 | The heating system of the 12MW small cogeneration unit under a kind of underrun operating mode |
| CN206160094U (en) * | 2016-09-29 | 2017-05-10 | 中国大唐集团科学技术研究院有限公司 | Water supply pump turbine exhaust steam waste heat utilization system |
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| US20200041120A1 (en) * | 2018-07-31 | 2020-02-06 | Xuedong GU | Injection Feedwater Heater for Steam Power Generating System |
| 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 |
-
2021
- 2021-11-12 CN CN202111343051.0A patent/CN114017844A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335301A (en) * | 2013-05-17 | 2013-10-02 | 西安交通大学 | Low-load feed-water heating system of thermal power generating unit |
| CN204730303U (en) * | 2015-06-09 | 2015-10-28 | 西安交通大学 | The heating system of the 12MW small cogeneration unit under a kind of underrun operating mode |
| CN206160094U (en) * | 2016-09-29 | 2017-05-10 | 中国大唐集团科学技术研究院有限公司 | Water supply pump turbine exhaust steam waste heat utilization system |
| CN108128956A (en) * | 2017-12-27 | 2018-06-08 | 大唐环境产业集团股份有限公司 | A kind of width load denitration and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN |
| US20200041120A1 (en) * | 2018-07-31 | 2020-02-06 | Xuedong GU | Injection Feedwater Heater for Steam Power Generating System |
| 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 |
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