CN113006895B - Method and system for reducing station power consumption rate of power plant - Google Patents
Method and system for reducing station power consumption rate of power plant Download PDFInfo
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- CN113006895B CN113006895B CN202110355449.XA CN202110355449A CN113006895B CN 113006895 B CN113006895 B CN 113006895B CN 202110355449 A CN202110355449 A CN 202110355449A CN 113006895 B CN113006895 B CN 113006895B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam 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
- F01K7/02—Steam 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 multiple-expansion type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam 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
- F01K7/16—Steam 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 only of turbine type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a method and a system for reducing the plant power consumption rate of a power plant, which comprises the following steps: the process residual steam of a power plant and the residual steam of a boiler are respectively used as steam sources, a multi-stage driving back pressure turbine is input, and each stage of driving back pressure turbine drives a rotating machine or drives a generator to generate electricity. The invention utilizes the residual steam of the power plant and/or the residual steam to drive the series of back pressure turbines which are arranged in series, can reduce the power consumption rate of the plant, simultaneously utilizes the residual heat and the residual energy of the power plant, utilizes the residual steam of the boiler in the deep peak regulation process, recovers the residual heat and improves the utilization efficiency of energy. Meanwhile, all the driving turbines are back pressure turbines, so that the driving steam has no cooling source loss.
Description
Technical Field
The invention relates to the technical field of utilization of waste heat and waste energy of industrial enterprises, in particular to a method and a system for reducing station power consumption rate of a power plant.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, a large number of rotating machines such as water pumps, fans, compressors, coal mills and the like exist in the production process of a power plant. The rotating machines consume most of the electricity consumption of the whole process flow, the plant power consumption rate of power plant enterprises reaches 5-7%, and the energy utilization efficiency is greatly influenced. The rotating equipment is indispensable in the whole process flow, so that the control of the plant power consumption rate of the rotating equipment has important significance for energy conservation and emission reduction of the whole plant.
A large amount of residual heat and residual steam exist in the production process of the power plant at present, such as constant-row continuous-discharge steam, deaerator steam discharge, door rod air leakage and the like. The residual steam resources lay resource conditions for further utilization.
At present, power plants are faced with the tasks of deep peak shaving and improvement of flexibility modification. When the peak load is deeply regulated, the load of the steam turbine can be reduced to be very low, but the load of the boiler cannot be reduced to be very low due to the limitation of the technical reasons such as combustion stability, the safety of a denitration system and the like. Thus, during deep peak shaving, the boiler load and the turbine load are not actually simultaneously available for deep turndown tasks. Under the influence of a boiler, the deep peak load regulation of the unit set cannot be too low, the flexibility of the unit set is influenced, and therefore new energy power generation cannot be more effectively absorbed and enters a power grid. Therefore, during deep peak regulation, the steam production of the boiler is different from that of the main turbine, the steam production of the main turbine is small, and the steam production of the boiler is large, so that the boiler has rich steam, namely rich steam.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a system for reducing the plant power consumption rate of a power plant.
In order to solve the problems, the invention provides a method and a system for reducing the plant power consumption rate of a power plant. Since this part of the electricity is generated by the dedicated surplus steam by driving the back pressure turbine and the dedicated generator, rather than the main turbine, the main generator of the power plant, this part of the electricity is dedicated to driving the rotating machinery. The part of rotating machinery can also be directly driven by a steam turbine, but because the field condition does not allow and the direct driving back pressure turbine cannot be installed, the back pressure turbine and the generator are installed at other places to directly drive the generator to generate electricity, and the part of rotating machinery is driven by the part of electric energy. This portion of the electrical energy is therefore dedicated electrical power.
In some embodiments, the following technical scheme is adopted:
a method of reducing power plant service power usage, comprising: the process residual steam of a power plant and the residual steam of a boiler are respectively used as steam sources, a multi-stage driving back pressure turbine is input, and each stage of driving back pressure turbine drives a rotating machine or drives a generator to generate electricity.
Furthermore, the multi-stage driving back pressure turbines adopt the same steam flow, the enthalpy drop of each back pressure turbine is determined according to the power of the driven rotating machinery, and the pressure is reduced step by step.
Further, the exhaust steam of the previous stage driving the back pressure turbine is used as the inlet steam of the next stage driving the back pressure turbine.
Further, the multistage driving back pressure turbines are connected in series.
Furthermore, the last stage of exhaust steam enters an external heat supply system or a heat return system of the unit.
In other embodiments, the following technical solutions are adopted:
a method of reducing power plant service power usage, comprising: the method comprises the following steps of taking process waste heat and residual steam of a power plant or residual steam of a boiler as a steam source, and directly driving a generator to generate special electric power by the steam source.
Further, the power plant process waste heat and the residual steam comprise: the method comprises the following steps of (1) fixed-row continuous-exhaust steam of a boiler, deaerator exhaust steam, steam leakage of a steam turbine door lever, and exhaust waste heat and slag discharge waste heat of the boiler;
the surplus steam of the boiler comprises: and the difference value between the steam production of the boiler and the steam consumption of the steam turbine during deep peak shaving of the unit.
In other embodiments, the following technical solutions are adopted:
a system for reducing power plant service power usage, comprising:
the output of the process waste heat and residual steam collecting device of the power plant and the output of the residual steam collecting device of the boiler are respectively connected with a plurality of stages of driving back pressure turbines which are connected in series, and each stage of driving back pressure turbine is connected with a rotating machine or a generator; the exhaust steam output of the final stage driving back pressure turbine is connected with a heat supply system and/or a heat regeneration system.
Furthermore, the multistage series connection driving back pressure turbines are connected with a rotating machine; or the multistage series connection driving back pressure turbines are connected with a generator.
Furthermore, in the multistage series connection driving back pressure turbines, part of the driving back pressure turbines are connected with a rotating machine, and the rest of the driving back pressure turbines are connected with a generator.
Compared with the prior art, the invention has the beneficial effects that:
the system utilizes the residual steam of the power plant and/or the residual steam to drive the series of back pressure steam turbines which are arranged in series, can reduce the power consumption rate of the plant, simultaneously utilizes the residual heat and the residual energy of the power plant, utilizes the residual steam of the boiler in the deep peak shaving process, recovers the residual heat and improves the energy utilization efficiency. Meanwhile, all the driving turbines are back pressure turbines, so that the driving steam has no cooling source loss.
On the other hand, the method utilizes the surplus steam of the boiler, can improve the flexibility of the unit to a certain extent, and increases the deep peak regulation amplitude of the unit.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a system for reducing plant power consumption rate in a power plant according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another system for reducing power consumption of a power plant in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a system for reducing power consumption of a power plant according to another embodiment of the present invention;
the system comprises a power plant process residual steam collecting device 1, a boiler residual steam collecting device 2, a back pressure steam turbine 3, a rotating machine 4, a generator 5, a heat supply system 6 and a heat regeneration system 7.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a method of reducing power usage by a power plant is disclosed, comprising: the process residual steam of a power plant and the residual steam of a boiler are respectively used as steam sources, a multi-stage driving back pressure turbine is input, and each stage of driving back pressure turbine drives a rotating machine or drives a generator to generate electricity.
Specifically, the waste heat and the residual steam of the power plant process are recycled, integrated and upgraded, and can be used as one of steam sources; because the pressure of the pure waste heat and the residual steam is too low to be directly used for driving a steam turbine, in addition, various waste heat and residual steam are dispersed in different places, and therefore recovery and integration are needed. The surplus steam of the boiler is used as the second steam source. And (3) utilizing surplus steam and/or surplus steam of a power plant to drive the back pressure turbine. According to the installation condition of the process position of the rotating machinery, if the installation position is feasible, a back pressure turbine can be directly installed and driven; after steam enters the driving back pressure steam turbine, the steam can directly drive a rotating machine to replace electric drive.
If the installation position on site is not enough, the steam can also directly drive the engine to generate special electric power which is specially used for driving the rotating machinery.
The back pressure type steam turbines are arranged according to the number of rotating machines needing to be driven in the process, and a series arrangement mode is adopted among the back pressure type steam turbines.
Each back pressure type steam turbine adopts the same steam flow, and the enthalpy drop of each back pressure type steam turbine of the steam is determined according to the power of the driven rotating machinery, and the pressure is reduced step by step; the exhaust steam of the front stage back pressure turbine is used as the inlet steam of the next stage back pressure turbine.
The exhaust steam of the final stage back pressure turbine can enter an external heat supply system and also can enter a heat return system of the unit. Therefore, the steam drives the back pressure turbines which are arranged in series, no cold source loss is generated, and the high energy utilization rate of the steam is ensured.
Example two
In one or more embodiments, a system for reducing power usage by a power plant is disclosed, with reference to FIG. 1, comprising: the system comprises a power plant process residual steam collecting device 1, a boiler residual steam collecting device 2 and a three-stage series back pressure turbine 3, wherein a first stage back pressure turbine drives a rotating machine 4, a second stage back pressure turbine drives a generator 5 to generate special electric power, a third stage back pressure turbine drives the rotating machine 4, and the exhaust steam of a third stage driving turbine enters a heating system 6 or a heat regenerative system 7.
In the back pressure turbine with three stages connected in series, two stages directly drive the rotating machinery, and one stage generates special electric power. The driving steam enters each stage of driving back pressure turbine from the steam source in sequence, and the exhausted steam enters the heat supply system 6 or the heat return system 7.
The back pressure type driving steam turbine has a system of directly driving a rotating machine and a generator, and represents a mixed arrangement mode of the rotating machine and the generator. The following advantages are embodied:
(1) the step-by-step driving is carried out, and energy levels are respectively utilized without energy level loss;
(2) all back pressure turbines and the exhaust steam of the final back pressure turbine enters a heat supply system or a heat regenerative system, and no cold source loss exists. Therefore, the surplus steam/steam surplus flow does not generate cold source loss, and the circulating heat efficiency is improved;
(3) the rotary machine and the generator are driven, and the characteristic of flexible arrangement due to the field is reflected. If the field condition allows, the back pressure type driving turbine can be arranged on the driven machinery field to realize direct driving. If the field condition is not allowed, a back pressure turbine and a generator are arranged at other places to directly drive the power generation to generate special electric energy, and then the rotating machinery is driven. Finally, the purpose of steam driving is realized, direct driving of a generator is replaced, and the plant power consumption rate is reduced.
EXAMPLE III
In one or more embodiments, a system for reducing power usage by a power plant is disclosed, with reference to FIG. 2, comprising: the system comprises a power plant process residual steam collecting device 1, a boiler residual steam collecting device 2 and a two-stage back pressure steam turbine 3 connected in series; wherein, the first stage back pressure turbine and the second stage back pressure turbine both directly drive the rotating machinery 4; the driving steam enters a two-stage back pressure turbine from a steam source in sequence, and the exhausted steam enters a heat supply system 6 or a heat return system 7.
The back pressure type driving turbine directly drives the rotating machinery, and represents an arrangement mode of using a surplus steam/surplus steam back pressure turbine to drive the rotating machinery. The following advantages are embodied:
(1) the step-by-step driving is carried out, and energy levels are respectively utilized without energy level loss;
(2) all back pressure turbines and the exhaust steam of the final back pressure turbine enters a heat supply system or a heat regenerative system, and no cold source loss exists. Therefore, the surplus steam/steam surplus flow does not generate cold source loss, and the circulating heat efficiency is improved;
(3) this is a preferred way. The residual steam/surplus steam back pressure turbine is used for driving the rotating machinery completely, direct driving of a generator is replaced, and plant power consumption rate is reduced.
Example four
In one or more embodiments, a system for reducing power usage by a power plant is disclosed, with reference to FIG. 3, comprising: the system comprises a power plant process residual steam collecting device 1, a boiler residual steam collecting device 2 and a two-stage back pressure steam turbine 3 connected in series; the first stage back pressure turbine and the second stage back pressure turbine both directly drive the generator 5 to generate special electric power, drive steam to sequentially enter the two stage back pressure turbines from a steam source, and exhaust steam enters the heat supply system 6 or the heat regenerative system 7.
Such back pressure driven turbines all directly drive the generator, representing an arrangement where the generator is driven all with a surplus steam/surplus steam back pressure turbine. The following advantages are embodied:
(1) the step-by-step driving is carried out, and energy levels are respectively utilized without energy level loss;
(2) all back pressure turbines and the exhaust steam of the final back pressure turbine enters a heat supply system or a heat regenerative system, and no cold source loss exists. Therefore, the surplus steam/steam surplus flow does not generate cold source loss, and the circulating heat efficiency is improved;
(3) because the driven rotating machinery is limited on site, a back pressure type driving steam turbine cannot be arranged, and the direct driving rotating machinery of the steam turbine cannot be realized. However, in order to reduce the plant power consumption, it is necessary to perform steam turbine driving instead of generator driving, and therefore, under such a condition, a back pressure turbine and a generator are arranged at another place, and directly driven to generate electricity, and dedicated electric energy is generated and then transmitted to the rotary machine to drive the rotary machine. Finally, the purpose of steam driving is realized, direct driving of a generator is replaced, and the plant power consumption rate is reduced.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (3)
1. A method of reducing power plant service rates, comprising: the process residual steam of a power plant and the residual steam of a boiler are respectively used as steam sources and input into a multi-stage driving back pressure turbine, and each stage of driving back pressure turbine drives a rotating machine to generate mechanical work or drives a generator to generate special electric power;
the multistage driving back pressure turbines are connected in series, and the last stage of exhaust steam enters an external heat supply system or a heat return system of the unit;
the power plant process residual steam comprises: the method comprises the following steps of (1) fixed-row continuous-exhaust steam of a boiler, deaerator exhaust steam, steam leakage of a steam turbine door lever, and exhaust smoke waste heat and slag discharge waste heat of the boiler; the surplus steam of the boiler comprises: the difference value between the steam production of the boiler and the steam consumption of the main steam turbine during deep peak shaving of the unit;
according to the installation condition of the process position of the rotating machinery, if the installation position is feasible, a driving back pressure turbine is directly installed; after steam enters a driving back pressure steam turbine, a rotating machine is directly driven to replace electric drive; if the installation position on site is not enough, the steam directly drives the engine to generate special electric power which is specially used for driving the rotating machinery.
2. The method for reducing power plant service rates of claim 1, wherein the plurality of stage driven back pressure turbines use the same steam flow to determine the enthalpy drop in each back pressure turbine based on the power of the driven rotating machinery, and the pressure is reduced stage by stage.
3. The method of reducing power plant service rates of a power plant of claim 1 wherein the exhaust from a previous stage driving the back pressure turbine is used as the inlet for a next stage driving the back pressure turbine.
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| CN202110355449.XA CN113006895B (en) | 2021-04-01 | 2021-04-01 | Method and system for reducing station power consumption rate of power plant |
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