CN112762427A - Multisource industrial steam supply switching system and method based on lowest coal consumption cost - Google Patents
Multisource industrial steam supply switching system and method based on lowest coal consumption cost Download PDFInfo
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- CN112762427A CN112762427A CN202110092084.6A CN202110092084A CN112762427A CN 112762427 A CN112762427 A CN 112762427A CN 202110092084 A CN202110092084 A CN 202110092084A CN 112762427 A CN112762427 A CN 112762427A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
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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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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Abstract
The invention discloses a multisource industrial steam supply switching system and method based on lowest coal consumption cost, which comprises a coal-fired generator set and a steam supply system; the invention adds three steam supply technologies of one-section steam extraction direct supply, main steam extraction direct supply and a steam generator, increases the reliability of an industrial steam supply system under the complex and changeable electric-thermal double scheduling condition, and simultaneously provides a multisource industrial steam supply mode switching method based on the lowest coal consumption cost of heat supply under different electric power and industrial steam supply flow.
Description
Technical Field
The invention belongs to the technical field of industrial steam supply, and relates to a multisource industrial steam supply switching system and method based on lowest coal consumption cost.
Background
The deep peak regulation of coal power can have adverse effects on the operation efficiency, pollution control and even equipment safety, and can be called 'pulling and moving the whole body'. With the transformation of coal-electricity function positioning, new requirements such as low utilization hours, wide-load operation, load tracking, quick response and the like make coal-electricity face new problems and challenges in the aspects of traditional function positioning, design concept, equipment performance, efficient operation, service life and the like in a power system.
Meanwhile, the low-cost coal power is the basis for reducing the power consumption and heat consumption cost in the whole society, and has important significance for promoting the development of the economic society and improving the happiness of people.
Coal and electricity are extracted from a certain part of the steam-water thermodynamic cycle for external supply, the production requirements of external steam-using enterprises are met, high-efficiency and environment-friendly large-capacity cogeneration units are used for supplying heat to the external centralized industry, dispersed coal-fired and oil-fired small boilers with heavy pollution and high energy consumption are replaced, and the method is favorable for reducing the emission of regional atmospheric pollutants while increasing the coal and electricity operation mode, improving the coal and electricity profit capacity and reducing the steam-using cost of enterprises.
The steam supply technology in the coal and electricity industry is various in types, and the comprehensive comparison and selection of the technical scheme should be carried out on the principles of temperature matching, pressure matching and cascade utilization. The industrial heat demand with the steam supply pressure of 1.8-3.3 MPa, and the heat readjustable steam extraction technology based on the steam inlet adjusting valve of the intermediate pressure cylinder,
after the coal-electricity is subjected to heat supply transformation, when the coal-fired generator set is in low electric power, the steam pressure is raised by closing the opening of the steam inlet regulating valve of the intermediate pressure cylinder so as to meet the requirements of users, and the steam-supply device has the advantage of large steam supply flow, but has the problems of large low-load throttling loss, poor heat supply economical efficiency, rapid reduction of steam supply capacity and the like. During the deep peak regulation period of the power grid, the industrial heating capacity can not meet the external requirements, the heating mode is single, the safety and reliability are poor, and the economy is low. At present, no stable industrial heat supply method which has both reliability and economy is available.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a multisource industrial steam supply switching system and method based on lowest coal consumption cost. On the basis of a hot re-adjustable steam extraction technology based on the steam inlet adjustment of the intermediate pressure cylinder, three steam supply technologies of one-section steam extraction direct supply, main steam extraction direct supply and a steam generator are added, and the reliability of an industrial steam supply system is improved under the complex and changeable electric-thermal double scheduling condition. After the industrial steam supply of the coal-fired generator set is transformed, the coal-fired generator set is subjected to double scheduling of power grid power load and steam supply quantity of hot users, the power load is scheduled by a power grid in real time according to the regional power utilization and power supply situation, and the steam supply quantity is influenced by the production characteristics of the users to change in real time, so that the coal-fired generator set operates in a wide-load electricity-heat double scheduling mode.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a multi-source industrial steam supply switching system based on lowest coal consumption cost comprises:
the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder of the coal-fired generator set are coaxially connected and drive the generator to generate electricity together;
the steam supply system comprises a reheat steam supply pipeline, a section of extraction steam supply pipeline, a main steam supply pipeline and an electric drive steam supply pipeline; one end of the reheat steam supply pipeline is connected with the reheat steam pipeline of the boiler, and the other end of the reheat steam supply pipeline is connected with the industrial steam supply header; one end of the first section of steam extraction and supply pipeline is connected with the first section of steam extraction pipeline, and the other end of the first section of steam extraction and supply pipeline is connected with the industrial steam supply header; one end of the main steam supply pipeline is connected with the main steam pipeline, and the other end of the main steam supply pipeline is connected with the industrial steam supply header; the electric-driven steam supply pipeline comprises a steam generator and a steam mixer, the steam generator is connected with a water supply system of the coal-fired generator set, a steam outlet is connected with the steam mixer, and main steam of the boiler and saturated steam input by the steam generator are mixed by the steam mixer and then conveyed to the industrial steam supply header.
The invention further improves the following steps:
the coal-fired power generating unit comprises a boiler, wherein a new steam outlet of the boiler is connected with a steam inlet of a high-pressure cylinder, a steam outlet of the high-pressure cylinder is connected with an inlet of a reheater of the boiler, an outlet of the reheater of the boiler is connected with a steam inlet of a medium-pressure cylinder, and a steam outlet of the medium-pressure cylinder is connected with a steam inlet of a low-pressure cylinder; the low-pressure cylinder steam exhaust port is sequentially connected with a condenser, a condensate pump, a low-pressure heater group, a water feed pump group and a high-pressure heater group, and the outlet of the high-pressure heater group is connected with a boiler.
And a steam inlet adjusting valve group is arranged at the steam inlet of the intermediate pressure cylinder, and partial reheat steam is led out from a pipeline between the boiler and the steam inlet adjusting valve group and enters an industrial steam supply header through a reheat steam extraction temperature and pressure reduction valve group and a first valve group.
And a part of steam is led out from a section of steam extraction pipeline of the high-pressure cylinder and enters the industrial steam supply header through a section of steam extraction temperature and pressure reduction valve group and a second valve group.
And part of main steam is led out of the main steam pipeline and enters the industrial steam supply header through the main steam extraction temperature and pressure reduction valve group and the third valve group.
Part of feed water is led out from the outlet of the high-pressure heater group to a steam generator, and main steam of a steam mixer comes from a main steam pipeline of a boiler; the power supply of the steam generator is from a transformer, and the transformer is connected with the generator through an electric switch.
The condenser is provided with a demineralized water replenishing port and is used for replenishing water to a water supply system.
The steam mixer comprises a steam pipeline in the middle, a steam ring pipe is arranged on the outer side of the steam pipeline, a plurality of atomizing nozzles are uniformly distributed on the periphery of the steam pipeline along the radial direction and the height direction of the steam pipeline, and the atomizing nozzles are communicated with the steam ring pipe; the inlet of the steam pipeline is connected with the steam outlet of the steam generator, and the outlet of the steam pipeline is connected with the industrial steam supply header through a fourth valve group; the outlet of the steam ring pipe is connected with a main steam pipeline through a main steam extraction regulating valve group, and the steam generator is connected to a pipeline at the outlet of the high-pressure heater group through a high-temperature water supply valve group.
And part of the feed water is led out of the outlet of the feed water pump set and respectively flows to the reheat steam supply pipeline through the reheat steam desuperheating water valve set, flows to the first section of steam supply pipeline through the first section of steam extraction desuperheating water valve set and flows to the main steam supply pipeline through the main steam extraction desuperheating water valve set.
A multisource industrial steam supply switching method based on lowest coal consumption cost comprises the following steam supply modes:
the first method is as follows: hot re-extraction steam adjusted by steam inlet adjusting valve group
After being subjected to temperature and pressure reduction by a reheat steam extraction temperature and pressure reduction valve set, the temperature and pressure reduction water is converged into an industrial steam supply header, the temperature reduction water is provided by the feed water at the outlet of a feed water pump set, and the reheat steam temperature reduction valve set is opened to participate in adjustment;
the second method comprises the following steps: first stage extraction
The first-stage steam is subjected to temperature and pressure reduction through a first-stage steam extraction temperature and pressure reduction valve set and then is converged into an industrial steam supply header, the temperature reduction water is provided by the water supply at the outlet of a water supply pump set, and the first-stage steam extraction temperature and pressure reduction valve set is opened to participate in adjustment;
the third method comprises the following steps: main steam extraction
The main steam extraction is subjected to temperature and pressure reduction through a main steam extraction temperature and pressure reduction valve set and then is converged into an industrial steam supply main pipe, the temperature reduction water is provided by water supply at the outlet of a water supply pump set, and the main steam extraction temperature reduction valve set is opened to participate in adjustment;
the method is as follows: steam supply of steam generator
The electric energy regulated by a transformer at the outlet of the generator is used as a heat source, the water supply at the outlet of the high-pressure heater group is led to the steam generator to absorb heat and change phase, saturated steam is output, and the pressure of the saturated steam is adjusted through a high-temperature water supply valve group and a water side flow in the steam generator; a steam mixer is arranged on a steam pipeline at the outlet of the steam generator, main steam and saturated steam are mixed, pressure and temperature measuring points arranged on an industrial steam supply header are taken as targets, and the proportional distribution of the saturated steam and the superheated steam is carried out by adjusting the opening degrees of a high-temperature water supply valve group and a main steam exhaust adjusting valve group.
Compared with the prior art, the invention has the following beneficial effects:
in order to meet the industrial steam supply requirement of 1.8-3.3 MPa and large flow (single machine-200 t/h), the coal-fired generator set mostly implements heat readjustable steam extraction based on the steam inlet regulating valve of the intermediate pressure cylinder, but the technology has the defects of large throttling loss and sharp rise of heat and coal consumption cost under the working conditions of low load and small flow. On the basis, the invention adds three steam supply technologies of one-section steam extraction direct supply, main steam extraction direct supply and a steam generator, increases the reliability of an industrial steam supply system under the complex and changeable electric-thermal double scheduling condition, and provides a multisource industrial steam supply mode switching method based on the lowest heat and coal consumption cost under different electric power and industrial steam supply flow.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a thermodynamic system of the present invention;
fig. 2 is a schematic structural view of a steam mixer according to the present invention.
Wherein, 1-boiler, 2-high pressure cylinder, 3-intermediate pressure cylinder, 4-low pressure cylinder, 5-generator, 6-condenser, 7-condensate pump, 8-low pressure heater group, 9-water feeding pump group, 10-high pressure heater group, 11-steam inlet regulating valve group, 12-reheating steam extraction temperature and pressure reducing valve group, 13-one section steam extraction temperature and pressure reducing valve group, 14-main steam extraction temperature and pressure reducing valve group, 15-reheating steam temperature and pressure reducing valve group, 16-one section steam extraction temperature and pressure reducing valve group, 17-main steam extraction temperature and pressure reducing valve group, 18-high temperature water feeding valve group, 19-electric switch, 20-transformer, 21-steam generator, 22-steam mixer, 23-main steam extraction regulating valve group, 24-first valve group, 25-second valve group, 26-third valve group, 27-fourth valve group.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the multi-source industrial steam supply switching system based on the lowest coal consumption cost comprises a coal-fired generator set and a steam supply system; the high-pressure cylinder 2, the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 of the coal-fired generator set are coaxially connected and drive a generator 5 to generate electricity together; the steam supply system comprises a reheat steam supply pipeline, a section of extraction steam supply pipeline, a main steam supply pipeline and an electric drive steam supply pipeline; one end of the reheat steam supply pipeline is connected with the reheat steam pipeline of the boiler 1, and the other end of the reheat steam supply pipeline is connected with an industrial steam supply header; one end of the first section of steam extraction and supply pipeline is connected with the first section of steam extraction pipeline, and the other end of the first section of steam extraction and supply pipeline is connected with the industrial steam supply header; one end of the main steam supply pipeline is connected with the main steam pipeline, and the other end of the main steam supply pipeline is connected with the industrial steam supply header; the electric-driven steam supply pipeline comprises a steam generator 21 and a steam mixer 22, the steam generator 21 is connected with a water supply system of the coal-fired power generating set, a steam outlet is connected with the steam mixer 22, and the steam mixer 22 mixes main steam of the boiler 1 with saturated steam input by the steam generator 21 and then conveys the mixed steam to an industrial steam supply header.
The coal-fired generating set comprises a boiler 1, wherein a new steam outlet of the boiler 1 is connected with a steam inlet of a high-pressure cylinder 2, a steam outlet of the high-pressure cylinder 2 is connected with an inlet of a reheater of the boiler 1, a reheater outlet of the boiler 1 is connected with a steam inlet of a medium-pressure cylinder 3, and a steam outlet of the medium-pressure cylinder 3 is connected with a steam inlet of a low-pressure cylinder 4; the steam exhaust port of the low pressure cylinder 4 is sequentially connected with a condenser 6, a condensate pump 7, a low pressure heater group 8, a water feed pump group 9 and a high pressure heater group 10, and the outlet of the high pressure heater group 10 is connected with the boiler 1.
An inlet steam regulating valve group 11 is arranged at the steam inlet of the intermediate pressure cylinder 3, and partial reheat steam is led out from a pipeline between the boiler 1 and the inlet steam regulating valve group 11 and enters an industrial steam supply header through a reheat steam extraction temperature-reduction pressure-reduction valve group 12 and a first valve group 24. A part of steam is led out from a section of steam extraction pipeline of the high-pressure cylinder 2 and enters an industrial steam supply header through a section of steam extraction temperature and pressure reduction valve group 13 and a second valve group 25. Part of main steam is led out from the main steam pipeline and enters the industrial steam supply header through the main steam extraction temperature and pressure reduction valve set 14 and the third valve set 26. Part of feed water is led out from the outlet of the high-pressure heater group 10 to a steam generator 21, and main steam of a steam mixer 22 comes from a main steam pipeline of the boiler 1; the steam generator 21 is powered by a transformer 20, which transformer 20 is connected to the generator 5 via an electrical switch 19. The condenser 6 is provided with a demineralized water replenishing port for replenishing water to a water supply system.
The steam mixer 22 comprises a steam pipeline 28 in the middle, a steam ring pipe 29 is arranged outside the steam pipeline 28, a plurality of atomizing nozzles 30 are uniformly distributed on the periphery of the steam pipeline 28 along the radial direction and the height direction, and the atomizing nozzles 30 are communicated with the steam ring pipe 29; the inlet of the steam pipeline 28 is connected with the steam outlet of the steam generator 21, and the outlet is connected with the industrial steam supply header through a fourth valve group 27; the outlet of the steam loop 29 is connected with the main steam pipeline through the main steam extraction regulating valve group 23, and the steam generator 21 is connected with the pipeline at the outlet of the high-pressure heater group 10 through the high-temperature water supply valve group 18. Part of the feed water led out from the outlet of the feed water pump set 9 respectively passes through a reheat steam temperature-reducing water valve set 15 to a reheat steam supply pipeline, passes through a section of steam extraction temperature-reducing water valve set 16 to a section of steam supply pipeline, and passes through a main steam air extraction temperature-reducing water valve set 17 to a main steam supply pipeline.
The principle of the invention is as follows:
a main pipe of reheated steam in front of the steam inlet regulating valve group 11 is provided with a tee joint, part of reheated steam is guided to a whole plant industrial steam supply header after being regulated by a reheated steam extraction temperature and pressure reduction valve group 12, the pressure of the hot reheated steam is greater than the pressure required by a hot user during high load of coal power, the hot reheated steam needs to be reduced in pressure and temperature at the same time, and the steam inlet regulating valve group 11 can be kept fully open without participating in regulation; the hot vapor pressure is lower than the pressure required by the hot user at the low load, the steam inlet adjusting valve group 11 participates in adjustment, the opening is closed to raise the hot vapor pressure, and at the moment, the hot vapor extraction only needs to be cooled. The desuperheated water is taken from the feed water at the outlet of the feed water pump set 9. Because the condensed water of the industrial steam supply is not recycled, desalted water with equal industrial steam supply amount is supplemented to the condenser 6 to maintain the steam-water quality balance of the coal-fired power generating set.
When no external heat supply is carried out, the coal-fired generating set is kept running in a pure condensation state. Steam at the outlet of the boiler 1 is heated for the second time in the boiler 1 after being acted by the high-pressure cylinder 2, new steam enters the middle-pressure cylinder 3 to act, exhaust steam enters the low-pressure cylinder 4, and the three cylinders coaxially drive the generator 5 to generate power. After entering a condenser 6 for condensation, the low-pressure cylinder 4 exhausts steam, and then enters the boiler 1 after being heated and pressurized by a condensate pump 7, a low-pressure heater group 8, a feed pump 9 and a high-pressure heater group 10 in sequence, so that steam-water circulation is completed.
The invention arranges a tee joint on a section of steam extraction pipeline, and part of the extracted steam at the section of steam extraction is adjusted by a section of steam extraction temperature and pressure reduction valve group 13 to the industrial steam supply header of the whole plant. The main steam pipeline is provided with a tee joint, and part of main steam is led to the industrial steam supply header of the whole plant after being adjusted by the main steam pumping temperature and pressure reducing valve set 14. A steam generator 21 is arranged in a coal-fired power plant, inlet high-temperature hot water is heated and vaporized by utilizing electric energy after the pressure transformation of an outlet of a generator 5, the outlet is high-pressure saturated steam, in order to avoid the risk of water hammer caused by water in steam in a steam pipeline and meet the requirement of a user on the superheat degree of the steam, a steam mixer 22 is arranged on an outlet steam pipeline of the steam generator 21, main steam with high superheat degree and saturated steam are mixed, pressure and temperature measuring points arranged in an industrial steam supply header are taken as targets, and the proportional distribution of the saturated steam and the superheated steam is carried out by adjusting the opening degrees of a high-temperature water supply valve group 18 and a main steam extraction regulating valve group 23.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a steam mixer 22, the steam mixer 22 is a cylindrical structure, steam with high superheat degree surrounds in a circular pipe manner, saturated steam is introduced into the cylinder, atomizing nozzles are uniformly arranged on the periphery of the cylinder along the radial direction and the height direction, the steam with high superheat degree is introduced, two streams of steam are closely contacted and mixed, and the outlet is steam with certain superheat degree.
The coal-fired power generating unit has four industrial steam supply modes, and the safety and reliability of industrial steam supply are greatly improved. The specific steam supply mode is as follows:
mode 1: the hot re-extraction steam based on the adjustment of the steam inlet adjusting valve group 11 is subjected to temperature and pressure reduction through the re-extraction steam temperature and pressure reduction valve group 12 and then is converged into a whole plant industrial steam supply header, the temperature reduction water is provided by the water supply at the outlet of the water supply pump group 9, and the valve group 15 is opened to participate in the adjustment.
Mode 2: one section of steam extraction and steam extraction pipeline is provided with a tee joint, the extracted steam is subjected to temperature and pressure reduction through a section of steam extraction temperature and pressure reduction valve set 13 and then is converged into a whole plant industrial steam supply header, the temperature reduction water is provided by water supply at an outlet of a water supply pump set 9, and a section of steam extraction temperature reduction water valve set 16 is opened to participate in adjustment.
Mode 3: the main steam is extracted, a tee joint is arranged at an outlet of the boiler 1 and a main steam pipeline before the steam enters the high-pressure cylinder 2, the extracted steam is subjected to temperature and pressure reduction through a main steam extraction temperature and pressure reduction valve set 14 and then is converged into a whole plant industrial steam supply main pipe, temperature reduction water is provided by water supply at an outlet of a water supply pump set 9, and a main steam extraction temperature reduction water valve set 17 is opened to participate in adjustment.
Mode 4: steam generator 21 supplies steam, the electric energy of generator 5 export through transformer 20 pressure regulation is the heat source, sets up the tee bend at the export water supply main pipe of high pressure heater group 10, draws partial high temperature high pressure feedwater to steam generator 21 heat absorption phase transition, and the export is saturated steam, and its pressure is adjusted in order to satisfy the user to the pressure demand of industrial steam through high temperature water supply valve group 18 and the inside water side flow of steam generator 21. In order to avoid the risk of water hammer caused by water in steam in a steam pipeline and meet the requirement of a user on the superheat degree of the steam, a steam mixer 22 is arranged on an outlet steam pipeline of a steam generator 21, main steam with high superheat degree and saturated steam are mixed, pressure and temperature measuring points arranged in an industrial steam supply header are taken as targets, and the proportional distribution of the saturated steam and the superheated steam is carried out by adjusting the opening degrees of a high-temperature water supply valve group 18 and a main steam extraction regulating valve group 23.
When any one mode fails, the other three modes can still provide stable industrial steam supply.
In addition, the coal consumption cost of the steam supply of the four industrial steam supply modes is different. The pure condensation state is taken as a reference, the coal and electricity supply industrial steam with a certain flow rate, and the standard coal cost increment of unit steam amount is called as the coal supply and consumption cost.
The method is suitable for obtaining the coal consumption cost distribution characteristics of the steam supply operation boundaries of the four steam supply modes and under the conditions of different electric loads and steam supply quantities by taking field tests and theoretical modeling analysis as means. The industrial steam supply mode is switched by taking the lowest cost of the steam and coal supply as the target.
Examples
Taking a certain 300 MW-grade cogeneration unit as an example, supplying 2.8MPa of industrial steam at 310 ℃ to the outside, designing a steam supply load of 200t/h based on a heat re-steam extraction scheme of steam admission regulating group parameter regulation, and setting the minimum running electric load to be 50 percent rated; the design steam supply load of the steam extraction external supply scheme of the first section of the steam extraction pipeline is 50t/h, and the minimum operation electric load is 50% rated; the design steam supply load of the main steam extraction external supply scheme is 50t/h, and the minimum operation electric load is 30% rated; the steam generator scheme is not influenced by the electric load of the coal-electric machine set, and the steam supply load is designed to be 100 t/h.
The steam supply mode switching strategy taking the electric load and the steam supply amount as dependent variables is as follows:
1) the electric load is more than 80 percent of rated load, and a hot re-steam extraction scheme based on the parameter adjustment of the steam inlet adjusting valve group is adopted.
2) The 50% rated load is less than the electrical load and less than 80% rated load, and the industrial steam supply flow is less than 50t/h, and a steam extraction external supply scheme of a section of steam extraction pipeline is adopted.
3)50 percent rated load is less than electric load and less than 80 percent rated load, and 200t/h is more than industrial steam supply flow and more than 50t/h, and a hot re-steam extraction scheme with steam inlet regulating valve group regulation is adopted.
4)30 percent rated load is less than electric load and less than 50 percent rated load, and the industrial steam supply flow is less than 50t/h, and a main steam extraction external supply scheme is adopted.
5)30 percent rated load is less than electric load and less than 50 percent rated load, the industrial steam supply flow is more than 50t/h, a main steam extraction external supply scheme is adopted to provide 50t/h steam supply, and the rest is supplemented by a steam generator scheme.
6) The electric load is less than 30% of rated load, and the industrial steam supply flow is less than 100t/h, and a steam generator scheme is adopted.
7) The electric load is less than 30 percent of rated load, and the industrial steam supply flow is more than 100t/h, which can not meet the requirement.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multisource industry supplies vapour switched systems based on coal consumption cost is minimum, its characterized in that includes:
the high-pressure cylinder (2), the intermediate pressure cylinder (3) and the low-pressure cylinder (4) of the coal-fired generator set are coaxially connected and drive the generator (5) to generate electricity together;
the steam supply system comprises a reheat steam supply pipeline, a section of extraction steam supply pipeline, a main steam supply pipeline and an electric drive steam supply pipeline; one end of the reheat steam supply pipeline is connected with the reheat steam pipeline of the boiler (1), and the other end of the reheat steam supply pipeline is connected with an industrial steam supply header; one end of the first section of steam extraction and supply pipeline is connected with the first section of steam extraction pipeline, and the other end of the first section of steam extraction and supply pipeline is connected with the industrial steam supply header; one end of the main steam supply pipeline is connected with the main steam pipeline, and the other end of the main steam supply pipeline is connected with the industrial steam supply header; the electric-drive steam supply pipeline comprises a steam generator (21) and a steam mixer (22), the steam generator (21) is connected with a water supply system of the coal-fired generator set, a steam outlet is connected with the steam mixer (22), and the steam mixer (22) mixes main steam of the boiler (1) with saturated steam input by the steam generator (21) and then conveys the mixed main steam to the industrial steam supply header.
2. The multisource industrial steam supply switching system based on lowest coal consumption cost according to claim 1, characterized in that the coal-fired power generating unit comprises a boiler (1), a new steam outlet of the boiler (1) is connected with a steam inlet of a high pressure cylinder (2), a steam outlet of the high pressure cylinder (2) is connected with an inlet of a reheater of the boiler (1), a reheater outlet of the boiler (1) is connected with a steam inlet of an intermediate pressure cylinder (3), and a steam outlet of the intermediate pressure cylinder (3) is connected with a steam inlet of a low pressure cylinder (4); the steam exhaust port of the low pressure cylinder (4) is sequentially connected with a condenser (6), a condensate pump (7), a low pressure heater group (8), a water feed pump group (9) and a high pressure heater group (10), and the outlet of the high pressure heater group (34) is connected with the boiler (1).
3. The multisource industrial steam supply switching system based on the lowest coal consumption cost according to the claim 2 is characterized in that a steam inlet regulating valve group (11) is arranged at a steam inlet of the intermediate pressure cylinder (3), and a part of reheated steam is led out from a pipeline between the boiler (1) and the steam inlet regulating valve group (11) and enters an industrial steam supply header through a reheated steam extraction temperature and pressure reduction valve group (12) and a first valve group (24).
4. The multisource industrial steam supply switching system based on the lowest coal consumption cost according to the claim 2, characterized in that a part of steam is led out from a section of steam extraction pipeline of the high-pressure cylinder (2) and enters an industrial steam supply header through a section of steam extraction temperature and pressure reduction valve group (13) and a second valve group (25).
5. The multisource industrial steam supply switching system based on the lowest coal consumption cost according to claim 2, wherein a part of main steam is led out from a main steam pipeline and enters an industrial steam supply header through a main steam extraction temperature-reducing pressure-reducing valve group (14) and a third valve group (26).
6. The coal-consumption-lowest-cost multi-source industrial steam supply switching system according to claim 2, characterized in that the outlet of the high-pressure heater group (10) leads part of the feed water to a steam generator (21), and the main steam of a steam mixer (22) comes from a main steam pipeline of a boiler (1); the power supply of the steam generator (21) comes from a transformer (20), and the transformer (20) is connected with the generator (5) through an electric switch (19).
7. The multisource industrial steam supply switching system based on lowest coal consumption cost according to claim 2, characterized in that the condenser (6) is provided with a demineralized water replenishing port for replenishing water to a water supply system.
8. The multisource industrial steam supply switching system based on the lowest coal consumption cost according to the claim 2 or 6, characterized in that the steam mixer (22) comprises a steam pipeline (28) in the middle, a steam ring pipe (29) is arranged outside the steam pipeline (28), a plurality of atomizing nozzles (30) are uniformly arranged on the periphery of the steam pipeline (28) along the radial direction and the height direction of the steam pipeline, and the atomizing nozzles (30) are communicated with the steam ring pipe (29); the inlet of the steam pipeline (28) is connected with the steam outlet of the steam generator (21), and the outlet is connected with the industrial steam supply header through a fourth valve group (27); the outlet of the steam ring pipe (29) is connected with a main steam pipeline through a main steam extraction adjusting valve group (23), and the steam generator (21) is connected to a pipeline at the outlet of the high-pressure heater group (10) through a high-temperature water supply valve group (18).
9. The multisource industrial steam supply switching system based on the lowest coal consumption cost according to claim 2 is characterized in that part of feed water is led out from the outlet of the feed water pump set (9) and respectively flows to a reheat steam supply pipeline through a reheat steam temperature-reducing water valve set (15), flows to a section of steam supply pipeline through a section of steam extraction temperature-reducing water valve set (16) and flows to a main steam supply pipeline through a main steam extraction temperature-reducing water valve set (17).
10. A multisource industrial steam supply switching method based on lowest coal consumption cost by using the system of any one of claims 1-9 is characterized by comprising the following steam supply modes:
the first method is as follows: heat re-extraction steam adjusted by steam inlet adjusting valve group (11)
The steam is collected into an industrial steam supply header after being subjected to temperature and pressure reduction through a reheat steam extraction temperature and pressure reduction valve set (12), the temperature reduction water is provided by the water supply at the outlet of a water supply pump set (9), and a reheat steam temperature reduction valve set (15) is opened to participate in adjustment;
the second method comprises the following steps: first stage extraction
The first-section steam is subjected to temperature and pressure reduction through a first-section steam extraction temperature and pressure reduction valve set (13) and then is converged into an industrial steam supply header, the temperature reduction water is provided by water supply at an outlet of a water supply pump set (9), and a first-section steam extraction temperature reduction water valve set (16) is opened to participate in adjustment;
the third method comprises the following steps: main steam extraction
The main steam extraction steam is subjected to temperature and pressure reduction through a main steam extraction temperature and pressure reduction valve set (14) and then is converged into an industrial steam supply main pipe, the temperature reduction water is provided by water supply at an outlet of a water supply pump set (9), and the main steam extraction temperature reduction water valve set (14) is opened to participate in adjustment;
the method is as follows: steam supply of steam generator (21)
The electric energy regulated by a transformer (20) at the outlet of the generator (5) is used as a heat source, the water supply at the outlet of the high-pressure heater group (10) is led to the steam generator (21) to absorb heat and change phase, saturated steam is output, and the pressure of the saturated steam is regulated through a high-temperature water supply valve group (18) and a water side flow inside the steam generator (21); a steam mixer (22) is arranged on a steam pipeline at the outlet of a steam generator (21), main steam and saturated steam are mixed, pressure and temperature measuring points arranged on an industrial steam supply header are taken as targets, and the proportional distribution of the saturated steam and the superheated steam is carried out by adjusting the opening degrees of a high-temperature water supply valve group (18) and a main steam extraction adjusting valve group (23).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883588A (en) * | 2021-09-24 | 2022-01-04 | 华能汕头海门发电有限责任公司 | Intelligent monitoring disc and emergency processing system for heat supply system |
| CN114046494A (en) * | 2021-09-23 | 2022-02-15 | 华能山东发电有限公司烟台发电厂 | Communication system and standby method for industrial steam extraction |
| CN114110736A (en) * | 2021-11-25 | 2022-03-01 | 广西电网有限责任公司电力科学研究院 | Non-contact heat exchange steam supply method for extracting steam at different steam temperatures |
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2021
- 2021-01-23 CN CN202110092084.6A patent/CN112762427A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046494A (en) * | 2021-09-23 | 2022-02-15 | 华能山东发电有限公司烟台发电厂 | Communication system and standby method for industrial steam extraction |
| CN114046494B (en) * | 2021-09-23 | 2024-03-22 | 华能山东发电有限公司烟台发电厂 | Communication system and standby method for industrial steam extraction |
| CN113883588A (en) * | 2021-09-24 | 2022-01-04 | 华能汕头海门发电有限责任公司 | Intelligent monitoring disc and emergency processing system for heat supply system |
| CN114110736A (en) * | 2021-11-25 | 2022-03-01 | 广西电网有限责任公司电力科学研究院 | Non-contact heat exchange steam supply method for extracting steam at different steam temperatures |
| CN114110736B (en) * | 2021-11-25 | 2023-02-28 | 广西电网有限责任公司电力科学研究院 | Non-contact heat exchange steam supply method for extracting steam at different steam temperatures |
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