CN111561364A - Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning - Google Patents

Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning Download PDF

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Publication number
CN111561364A
CN111561364A CN202010582731.7A CN202010582731A CN111561364A CN 111561364 A CN111561364 A CN 111561364A CN 202010582731 A CN202010582731 A CN 202010582731A CN 111561364 A CN111561364 A CN 111561364A
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China
Prior art keywords
valve
water
heat supply
heat
supply network
Prior art date
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Pending
Application number
CN202010582731.7A
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Chinese (zh)
Inventor
王妍
杨荣祖
吕凯
刘学亮
马汀山
余小兵
刘永林
王东晔
郑天帅
杨利
林轶
赵若昱
李�昊
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
Original Assignee
Thermal Power Research Institute
Xian Xire Energy Saving Technology Co Ltd
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Application filed by Thermal Power Research Institute, Xian Xire Energy Saving Technology Co Ltd filed Critical Thermal Power Research Institute
Priority to CN202010582731.7A priority Critical patent/CN111561364A/en
Publication of CN111561364A publication Critical patent/CN111561364A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/38Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00General layout or general methods of operation of complete plants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic

Abstract

The invention discloses a cascade utilization back pressure steam turbine power generation system and method capable of realizing annual operation, wherein water for supplying/returning to a heat supply network is respectively led in front of a valve of a water inlet/outlet pipeline of a heat supply network heater, and circulating power of a heat medium booster pump enters a flue gas reheater and a water heating type air heater to serve as heat sources of flue gas and cold air. Therefore, the waste pressure cascade utilization turbine exhaust energy can be eliminated in non-heating seasons, the cascade utilization back pressure turbine power generation system can be put into operation all the year around, and energy conservation and income generation of a power plant are facilitated. In the heating season, the heat supply extraction steam enters the back pressure type steam turbine generator unit to do work, and the exhaust steam enters the heat supply network heater, so that the cascade utilization of the heat supply extraction steam energy is realized. In non-heating seasons, the exhaust steam of the back pressure turbine is used as a heat source of low-temperature heat exchange equipment such as a flue gas cooler and a boiler air heater, and a heat supply network water system is used as a heat carrier, so that the exhaust steam of the back pressure turbine can be reasonably consumed in non-heating seasons, and the full-year operation of the back pressure turbine power generation system by cascade utilization is realized.

Description

Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of comprehensive utilization of heat energy, and relates to a cascade utilization backpressure steam turbine power generation system and method capable of achieving annual commissioning.
[ background of the invention ]
In the field of heating and heat supply of residents, when the steam extraction parameter of a unit is higher than the steam parameter required by external supply, the pressure of the extracted steam is often required to be reduced. Steam extraction throttling loss is a common problem in heat supply, the corresponding energy-saving potential is extremely high, and the problem is more prominent under the background of deep peak regulation of a thermal power generating unit (requiring wide-load operation). If effective measures can be taken to reasonably utilize the part of energy, the heat supply economy of the unit can be greatly improved.
At present, although more power plants develop heat supply steam extraction energy-saving research through various means, for example, a heat supply steam extraction residual pressure cascade utilization system is adopted, steam extraction energy is reasonably and hierarchically utilized through a backpressure steam turbine generator set, and work application power generation is used for a belt splicing unit plant service power system. However, in the non-heating period, the exhaust steam of the backpressure steam turbine generator unit cannot be consumed, and only can be idled and stopped, so that the utilization rate of equipment is low. If reasonable users can be found to consume the exhaust steam of the back pressure turbine, the annual commissioning of the back pressure turbine power generation system by cascade utilization can be realized, and the energy conservation and income creation of a power plant are very favorable.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides a cascade utilization back pressure steam turbine power generation system and method capable of realizing annual operation. In the heating season, the heat supply extraction steam enters a back pressure type steam turbine generator set to do work, and the exhaust steam enters a heating network heater to realize the cascade utilization of the heat supply extraction steam energy. In non-heating seasons, the exhaust steam of the back pressure turbine is used as a heat source of low-temperature heat exchange equipment such as a flue gas cooler and a boiler air heater, and a heat supply network water system is used as a heat carrier, so that the exhaust steam of the back pressure turbine can be reasonably consumed in non-heating seasons, and the full-year operation of the back pressure turbine power generation system by cascade utilization is realized.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a cascade utilization backpressure steam turbine power generation system capable of achieving annual commissioning comprises:
the residual pressure cascade utilization steam turbine is connected with a heating steam extraction end by utilizing a steam inlet end of the steam turbine, and exhaust steam enters a hot side of the heat supply network heater;
the drain outlet of the heat supply network heater is communicated with the drain tank; the heat supply network circulating water enters from a cold side inlet of the heat supply network heater, and enters a water supply pipeline of the heat supply network circulating water from a cold side outlet after heat exchange;
and the heat supply/return circulation pipeline is connected in parallel with the two ends of the inlet and the outlet of the cold side of the heat supply network heater.
The invention further improves the following steps:
and the residual pressure cascade utilizes the output shaft of the steam turbine to be connected with a generator to drive the generator to generate power.
A cold side inlet of the heat supply network heater is connected with a first valve, and the inlet of the circulating water of the heat supply network is controlled by the first valve; and the cold side outlet is connected with a second valve, and the second valve is used for controlling the circulating water of the heat supply network to enter a water supply pipeline.
The heat supply/return circulation pipeline comprises a third valve, a fourth valve and a heat medium water circulation pump; the inlet of the third valve is connected to the pipeline between the first valve and the heat supply network heater, and the outlet of the fourth valve is connected to the pipeline between the second valve and the heat supply network heater;
the outlet of the third valve is connected with a heat medium water circulating pump, and the outlet of the heat medium water circulating pump is respectively connected with a flue gas reheater and a water heating type air heater; and the outlet water of the flue gas reheater and the water heating type air heater is converged and then enters the heat supply network heater through the fourth valve to complete circulation.
And a first adjusting valve is further arranged on a pipeline between the third valve and the heat medium water circulating pump, a second adjusting valve is further arranged on a pipeline between the flue gas reheater and the water heating type air heater and the fourth valve, and the first adjusting valve and the second adjusting valve are used for adjusting the circulating water flow of the heat supply/return circulating pipeline.
A cascade utilization back pressure steam turbine power generation method capable of realizing annual operation comprises the following steps:
heating extraction steam firstly enters an excess pressure cascade to utilize a steam turbine to do work and drive a generator to generate electricity; the residual pressure step utilizes the steam turbine to exhaust steam to enter a heat supply network heater, and after circulating water is heated, the water is drained and returned to a drain tank;
in the heating season, the first valve and the second valve are opened, the third valve and the fourth valve are closed, the heat supply network circulating water enters the heat supply network heater and exchanges heat with the residual pressure cascade by utilizing steam turbine exhaust steam to finish the utilization of the residual pressure cascade by utilizing the steam turbine exhaust steam energy, and the heated heat supply network circulating water is sent to a heat supply network water supply pipeline;
in non-heating seasons, the third valve and the fourth valve are opened, the first valve and the second valve are closed, one path of supply/return network water is led from the water inlet/outlet side of the heat network heater respectively, the network water is heated by steam turbine exhaust in the heat network heater, then the network water is boosted by the heat medium booster pump and enters the flue gas reheater and the water heating type air heater to release heat, and outlet water returns to the heat network heater to complete circulation.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize a cascade utilization back pressure steam turbine power generation system which is put into operation all the year round, and by respectively leading and connecting supply/return network water in front of a water inlet/outlet pipeline valve of a heat network heater, the circulating power of a heat medium booster pump enters a flue gas reheater and a heater to be used as heat sources of flue gas and cold air. Therefore, the waste pressure cascade utilization turbine exhaust energy can be eliminated in non-heating seasons, the cascade utilization back pressure turbine power generation system can be put into operation all the year around, and energy conservation and income generation of a power plant are facilitated.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a power generation system of the present invention.
Wherein: 1-residual pressure cascade utilization steam turbine, 2-generator, 3-heat supply network heater, 4-drain tank, 5-first valve, 6-second valve, 7-third valve, 8-fourth valve, 9-heat medium water circulating pump, 10-first regulating valve, 11-second regulating valve, 12-flue gas reheater and 13-water heating type air heater.
[ detailed description ] embodiments
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the cascade utilization back pressure steam turbine power generation system which can be put into operation all year round of the invention comprises a residual pressure cascade utilization steam turbine 1, a heat supply network heater 3 and a heat supply/return circulation pipeline.
The residual pressure cascade utilizes the steam inlet end of the steam turbine 1 to connect with the heating steam extraction, and the exhaust steam enters the hot side of the heat supply network heater 3; the output shaft of the turbine 1 is connected with a generator to drive the generator 2 to generate electricity.
A cold side inlet of the heat supply network heater 3 is connected with a first valve 5, and the inlet of heat supply network circulating water is controlled by the first valve 5; and the cold side outlet is connected with a second valve 6, and the second valve 6 is used for controlling the circulating water of the heat supply network to enter a water supply pipeline. The drainage outlet of the heat supply network heater 3 is communicated with the drainage tank 4; the heat supply network circulating water enters from a cold side inlet of the heat supply network heater 3, and enters a water supply pipeline of the heat supply network circulating water from a cold side outlet after heat exchange;
the heat supply/return circulation pipeline is connected in parallel with the inlet and the outlet of the cold side of the heating network heater 3. The heat supply/return circulation pipeline comprises a third valve 7, a fourth valve 8 and a heat medium water circulation pump 9; the inlet of the third valve 7 is connected to the pipeline between the first valve 5 and the heat supply network heater 3, and the outlet of the fourth valve 8 is connected to the pipeline between the second valve 6 and the heat supply network heater 3; the outlet of the third valve 7 is connected with a hot medium water circulating pump 9, and the outlet of the hot medium water circulating pump 9 is respectively connected with a flue gas reheater 12 and a water heating type air heater 13; and the outlet cold water of the flue gas reheater 12 and the water heating type air heater 13 is merged and then enters the heat supply network heater 3 through the fourth valve 8 to complete the circulation. A first adjusting valve 10 is further arranged on a pipeline between the third valve 7 and the heat medium water circulating pump 9, a second adjusting valve 11 is further arranged on a pipeline between the flue gas reheater 12 and the water heating type air heater 13 and the fourth valve 8, and the first adjusting valve 10 and the second adjusting valve 11 are used for adjusting the circulating water flow of the heat supply/return circulating pipeline.
The structural principle of the invention is as follows:
the heating extraction steam firstly enters the residual pressure cascade to utilize the steam turbine 1 to do work, and drives the generator 2 to generate power. The residual pressure gradient utilizes the steam discharged by the steam turbine 1 to enter a heat supply network heater 3, and after heating the circulating water of the heat supply network, the water is drained and returned to a drain tank 4. And reasonable cascade utilization of heating extraction energy is realized by utilizing a turbine system through residual pressure cascade utilization.
In the heating season, the first valve 5 and the second valve 6 are opened, the third valve 7 and the fourth valve 8 are closed, the heat supply network circulating water enters the heat supply network heater 3 and exchanges heat with the excess pressure cascade through steam turbine exhaust steam to complete utilization of the excess pressure cascade through steam turbine exhaust steam energy, and the heated heat supply network circulating water is sent to a heat supply network water supply pipeline.
In non-heating seasons, the third valve 7 and the fourth valve 8 are opened, the first valve 5 and the second valve 6 are closed, one path of supply/return heating network water is respectively led from the water inlet/outlet side of the heating network heater 3, the heating network water is heated by the exhaust steam of the steam turbine 1 in the heating network heater 3, then the pressure of the heating network water is increased by the heating medium booster pump 9 and enters the flue gas reheater 12 and the water heating type air heater 13 to release heat, and the outlet water returns to the heating network heater 3 to complete circulation. By closing the first valve 5 and the second valve 6, the heat supply network heater is independent of the whole heat supply network system in non-heating seasons. Therefore, the waste pressure cascade utilization turbine exhaust energy can be absorbed in the non-heating season, and the cascade utilization back pressure turbine system can be put into operation all the year round. At the beginning and end of the heating season, the heat supply network heater 3 is cleaned, and the influence of water quality difference on a boiler flue gas reheater and a heat exchange tube bundle of a water heating type air heater is avoided.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (6)

1. A cascade utilization backpressure steam turbine power generation system capable of achieving annual commissioning is characterized by comprising:
the residual pressure cascade utilization steam turbine (1) is connected with a heating steam extraction end of the steam turbine (1), and exhaust steam enters the hot side of the heat supply network heater (3);
the drain outlet of the heat supply network heater (3) is communicated with the drain tank (4); the heat supply network circulating water enters from a cold side inlet of the heat supply network heater (3), and enters a water supply pipeline of the heat supply network circulating water from a cold side outlet after heat exchange;
and the heat supply/return circulation pipeline is connected in parallel with the two ends of the inlet and the outlet of the cold side of the heat supply network heater (3).
2. The cascade utilization backpressure steam turbine power generation system capable of achieving annual commissioning according to claim 1, wherein the output shaft of the residual pressure cascade utilization steam turbine (1) is connected with a generator to drive the generator (2) to generate power.
3. The cascade utilization backpressure steam turbine power generation system capable of achieving annual commissioning according to claim 1, characterized in that a cold side inlet of the heat supply network heater (3) is connected with a first valve (5), and the inlet of heat supply network circulating water is controlled through the first valve (5); and the cold side outlet is connected with a second valve (6), and the second valve (6) is used for controlling the circulating water of the heat supply network to enter a water supply pipeline.
4. The cascade utilization back pressure steam turbine power generation system capable of realizing annual commissioning according to claim 3, wherein the supply/return heat circulation pipeline comprises a third valve (7), a fourth valve (8) and a hot medium water circulation pump (9); the inlet of the third valve (7) is connected to the pipeline between the first valve (5) and the heat supply network heater (3), and the outlet of the fourth valve (8) is connected to the pipeline between the second valve (6) and the heat supply network heater (3);
an outlet of the third valve (7) is connected with a hot medium water circulating pump (9), and an outlet of the hot medium water circulating pump (9) is respectively connected with a flue gas reheater (12) and a water heating type air heater (13); the outlet water of the flue gas reheater (12) and the water heating type air heater (13) is converged and then enters the heat supply network heater (3) through the fourth valve (8) to complete circulation.
5. The cascade utilization backpressure steam turbine power generation system capable of achieving annual commissioning as recited in claim 4, wherein a first regulating valve (10) is further arranged on a pipeline between the third valve (7) and the heat medium water circulating pump (9), a second regulating valve (11) is further arranged on a pipeline between the flue gas reheater (12) and the water heating type air heater (13) and the fourth valve (8), and the first regulating valve (10) and the second regulating valve (11) are used for regulating the flow rate of circulating water of the heat supply/return circulating pipeline.
6. A cascade utilization back pressure steam turbine power generation method capable of realizing year round operation by using the system of claim 4 or 5, characterized by comprising the following steps:
heating extraction steam firstly enters a residual pressure cascade utilization steam turbine (1) to do work and drive a generator (2) to generate electricity; the residual pressure gradient utilizes the steam discharged by the steam turbine (1) to enter a heat supply network heater (3), and after circulating water is heated, the water is drained and returned to a drain tank (4);
in the heating season, a first valve (5) and a second valve (6) are opened, a third valve (7) and a fourth valve (8) are closed, the heat supply network circulating water enters a heat supply network heater (3) and exchanges heat with the residual pressure cascade by utilizing steam turbine exhaust steam to finish the utilization of the residual pressure cascade by utilizing the steam turbine exhaust steam energy, and the heated heat supply network circulating water is sent to a heat supply network water supply pipeline;
in non-heating seasons, the third valve (7) and the fourth valve (8) are opened, the first valve (5) and the second valve (6) are closed, one path of supply/return network water is respectively led from the water inlet/outlet side of the heat network heater (3), the network water is heated by the exhaust steam of the steam turbine (1) in the heat network heater (3), then the network water is boosted by the heat medium booster pump (9) and enters the flue gas reheater (12) and the water heating type air heater (13) to release heat, and the outlet water returns to the heat network heater (3) to complete circulation.
CN202010582731.7A 2020-06-23 2020-06-23 Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning Pending CN111561364A (en)

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CN202010582731.7A CN111561364A (en) 2020-06-23 2020-06-23 Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning

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CN202010582731.7A CN111561364A (en) 2020-06-23 2020-06-23 Cascade utilization back pressure steam turbine power generation system and method capable of achieving annual commissioning

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113847110A (en) * 2021-09-18 2021-12-28 西安西热节能技术有限公司 Heating back pressure machine power generation system capable of achieving annual commissioning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113847110A (en) * 2021-09-18 2021-12-28 西安西热节能技术有限公司 Heating back pressure machine power generation system capable of achieving annual commissioning

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