CN111204833A - Realize coal-fired power plant water and electricity cogeneration system - Google Patents
Realize coal-fired power plant water and electricity cogeneration system Download PDFInfo
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- CN111204833A CN111204833A CN202010124611.2A CN202010124611A CN111204833A CN 111204833 A CN111204833 A CN 111204833A CN 202010124611 A CN202010124611 A CN 202010124611A CN 111204833 A CN111204833 A CN 111204833A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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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
- 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
- F22D11/00—Feed-water supply not provided for in other main groups
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a system for realizing cogeneration of water and electricity of a coal-fired power plant, which comprises a boiler, a high-pressure cylinder, a middle-pressure cylinder, a low-pressure cylinder and a low-temperature multi-effect seawater desalination device, wherein the inlet of the low-temperature multi-effect seawater desalination device is connected with an original seawater taking pump, and the outlet of the low-temperature multi-effect seawater desalination device is connected with a fresh water delivery pump; the fresh water delivery pump pressurizes and outputs the desalinated seawater, one part of the desalinated seawater is output as finished water, one part of the desalinated seawater is used as desuperheating water for heating steam and is delivered to a desuperheating pressure reducer, and the last part of the desalinated seawater is used as a coal-fired unit to be consumed and delivered to a water supply system. The invention realizes the water and electricity cogeneration system of the coal-fired power station, utilizes the steam of the low-grade power station to drive the low-temperature multi-effect seawater desalination device to produce water, meets the water demand of the power station, and can sell fresh water to the outside to realize the supply of electricity, water and multi-products; the invention drives the low-temperature multi-effect seawater desalination device by using the steam with relatively low quality, realizes the cascade utilization of steam energy and simultaneously supplies fresh water to the outside, and improves the survival capability and sustainable development capability of the electric power market under the new situation.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of electricity-water cogeneration, and relates to a water-electricity cogeneration system for a coal-fired power station.
[ background of the invention ]
With the development of global economy, energy and environmental protection situation, the current coal-fired power plant will face more strict environmental protection requirements and severe market operation situation, which mainly shows that: 1) the electric quantity scheduling is adjusted from nameplate scheduling to energy-saving scheduling step by step, and the coal-fired power station is required to continuously save energy and reduce consumption; 2) the thermal power generation hours are reduced, and the profitability of the power generation side is reduced; 3) renewable energy utilization rate is low, the demand of thermal power generating unit on flexibility peak regulation is urgent, the coal-fired power station is gradually transformed from the current power supply main power to the peak regulation main power, the low-load frequency and frequent peak regulation are the main current situations of the coal-fired power station in a period of the future, and the duration of the current situations depends on the power development of new energy such as wind power, light water and the like and the industrial production of energy storage technologies. At present, the maximum peak-to-valley difference in China is about 25% of the highest load, and the peak regulation requirement of the current power system is about 45% by adding a wind-light power supply accounting for 20%. The coal-electricity enterprises need to actively change concepts: 1) gradual angle matching rotation from the main power of a power supply: the annual utilization time is between hours and 4000 hours. 2) Transformation of pure power supply to comprehensive energy supply base gradually: electricity, heat, steam, gas, cold, water.
Fresh water resources in coastal areas are short, the project cost of main flow south-to-north water transfer is relatively high, the supply is not in demand, and seawater desalination is used as an important guarantee for local water resources. The main technical route of seawater desalination comprises a thermal method and a membrane method, the membrane method has the main defects of large floor area, large chemical consumption, seawater temperature-dependent performance and the like, and the application prospect is slightly lower than that of the thermal method.
The system for realizing the water and electricity cogeneration of the coal-fired power station utilizes the steam with relatively low quality of the steam-water circulating system of the power station to drive the low-temperature multi-effect seawater desalination device, realizes the water and electricity cogeneration, supplies fresh water, reduces the loss of a coal and electricity cold source, and improves the coal and electricity viability and sustainable development capability under new potentials.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides a system for realizing the water and electricity cogeneration of a coal-fired power station, which can supply fresh water to the outside while meeting the fresh water requirement of the power station, realize the water and electricity cogeneration, reduce the loss of a coal and electricity cold source and improve the coal and electricity viability and sustainable development capability under a new potential.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a system for realizing water and power cogeneration of a coal-fired power plant is characterized by comprising:
the exhaust steam of the boiler is conveyed to the high-pressure cylinder to do work;
the exhaust steam of the high-pressure cylinder is reheated by a boiler and then is transmitted to the intermediate-pressure cylinder to do work;
one part of the exhaust steam of the intermediate pressure cylinder is conveyed to the low pressure cylinder to do work, and the other part of the exhaust steam is conveyed to the low-temperature multi-effect seawater desalination device to do work through the temperature and pressure reduction device;
the exhaust steam of the low pressure cylinder is heated by a water supply system and then flows back to the boiler to form exhaust steam circulation;
the inlet of the low-temperature multi-effect seawater desalination device is connected with an original seawater taking pump, and the outlet of the low-temperature multi-effect seawater desalination device is connected with a fresh water delivery pump; the fresh water delivery pump pressurizes and outputs the desalinated seawater, one part of the desalinated seawater is output as finished water, one part of the desalinated seawater is used as desuperheating water for heating steam and is delivered to a desuperheating pressure reducer, and the last part of the desalinated seawater is used as a coal-fired unit to be consumed and delivered to a water supply system.
The invention further improves the following steps:
the water supply system comprises a condenser, a condensate pump, a low-pressure heater group, a water supply pump and a high-pressure heater group which are connected in sequence; the inlet of the condenser is connected with the exhaust of the low-pressure cylinder; pressurizing a part of desalinated seawater by a fresh water delivery pump and delivering the desalinated seawater to an inlet pipeline of a condensate pump; the outlet of the high-pressure heater group is connected with the boiler.
And a middle-low pressure communicating pipe regulating valve is arranged at the outlet of the intermediate pressure cylinder and used for regulating the air extraction pressure and flow when the electrical load of the coal-fired unit is reduced.
And the low-temperature multi-effect seawater desalting device is connected with a water ring vacuum pump set for pumping out non-condensable gas.
And the rotating shafts of the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are coaxially connected and drive the generator to generate power together.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes the water and electricity cogeneration system of the coal-fired power station, utilizes the steam of the low-grade power station to drive the low-temperature multi-effect seawater desalination device to produce water, meets the water demand of the power station, and can sell fresh water to the outside to realize the supply of electricity, water and multi-products; the invention improves the coal-electricity viability and sustainable development ability under new conditions, and is particularly suitable for coastal areas with fresh water shortage. The low-temperature multi-effect seawater desalination device is driven by steam with relatively low quality, so that the cascade utilization of steam energy is realized, fresh water is supplied to the outside at the same time, the device is suitable for the expansion of market operation modes of coastal coal-fired power stations, the survival capability and the sustainable development capability of the power market under the new situation are improved, and the device is particularly suitable for coastal areas lacking of fresh water resources.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein, 1-a boiler; 2-high pressure cylinder; 3-a medium pressure cylinder; 4-low pressure cylinder; 5-a generator; 6-a condenser; 7-a condensate pump; 8-low pressure heater group; 9-a water supply pump; 10-high pressure heater group; 11-medium and low pressure communicating pipe regulating valve; 12-a raw seawater pump; 13-low-temperature multi-effect seawater desalination device; 14-a fresh water delivery pump; 15-water ring vacuum pump group; 16-temperature and pressure reduction device.
[ 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 system for realizing cogeneration of water and electricity of the coal-fired power plant comprises a boiler 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4 and a low-temperature multi-effect seawater desalination device 13, wherein exhaust steam of the boiler 1 is conveyed to the high-pressure cylinder 2 to do work; exhaust steam of the high-pressure cylinder 2 is reheated by the boiler 1 and then is transmitted to the intermediate-pressure cylinder 3 to do work; one part of the exhaust steam of the intermediate pressure cylinder 3 is conveyed to the low pressure cylinder 4 to do work, and the other part of the exhaust steam is conveyed to the low-temperature multi-effect seawater desalination device 13 to do work through the temperature and pressure reduction device 16; and a middle and low pressure communicating pipe regulating valve 11 is arranged at the outlet of the intermediate pressure cylinder 3 and is used for regulating the air extraction pressure and flow when the electric load of the coal-fired unit is reduced. The exhaust steam of the low pressure cylinder 4 is heated by a water supply system and then flows back to the boiler 1 to form exhaust steam circulation; the inlet of the low-temperature multi-effect seawater desalination device 13 is connected with the original seawater water taking pump 12, and the outlet is connected with the fresh water delivery pump 14; the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 are coaxially connected through rotating shafts and drive a generator 5 to generate electricity together. The low-temperature multi-effect seawater desalination device 13 is connected with a water ring vacuum pump set 15 for pumping out non-condensable gas. The fresh water delivery pump 14 pressurizes and outputs the desalinated seawater, one part of the desalinated seawater is output as finished water, one part of the desalinated seawater is used as desuperheating water for heating steam and is delivered to the desuperheating pressure reducer 16, and the last part of the desalinated seawater is used as a coal-fired unit and is delivered to a water supply system. The water supply system comprises a condenser 6, a condensate pump 7, a low-pressure heater group 8, a water supply pump 9 and a high-pressure heater group 10 which are connected in sequence; the inlet of the condenser 6 is connected with the exhaust steam of the low-pressure cylinder 4; a fresh water delivery pump 14 pressurizes and delivers a part of desalinated seawater to an inlet pipeline of the condensate pump 7; the outlet of the high-pressure heater group 10 is connected to the boiler 1.
The working principle of the invention is as follows:
the heat source of the low-temperature multi-effect seawater desalination device 13 is provided by steam extraction of a low-pressure communicating pipe in a coal-fired power plant, new steam at the outlet of the boiler 1 is extracted to supply to the low-temperature multi-effect seawater desalination device 13 after acting through a high-pressure cylinder 2 and a medium-pressure cylinder 3 of a steam turbine in sequence, and the rest of the new steam enters a low-pressure cylinder 4 to act to drive a generator 5 to generate power. The raw seawater enters a low-temperature multi-effect seawater desalination device 13 after being boosted by a water intake pump 12, the finished product fresh water is pressurized by a delivery pump 14, one part of the finished product fresh water is supplied to the outside, one part of the finished product fresh water is taken as temperature-reducing water for heating steam and delivered to a temperature-reducing pressure reducer 16, the other part of the finished product fresh water is supplied to a coal-fired power plant for consumption and supplement to a water supply system, and the finished product fresh water and the low-pressure cylinder exhaust condensate water enter a boiler to absorb heat after passing through a condenser 6, a condensate pump 7, a low-pressure heater group 8. When the electric load of the coal-fired unit is reduced, the medium-low pressure communicating pipe regulating valve 11 is required to participate in throttling so as to ensure the steam extraction pressure and flow. In addition, in order to maintain the vacuum operation of the low-temperature multi-effect seawater desalination device, a water ring vacuum pump set 15 is configured to pump out non-condensable gas.
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 (5)
1. A system for realizing water and power cogeneration of a coal-fired power plant is characterized by comprising:
the boiler (1), the exhaust steam of the boiler (1) is conveyed to the high-pressure cylinder (2) to do work;
the high-pressure cylinder (2), the exhaust steam of the high-pressure cylinder (2) is reheated by the boiler (1) and then is conveyed to the intermediate-pressure cylinder (3) to do work;
one part of the exhaust steam of the intermediate pressure cylinder (3) is conveyed to the low pressure cylinder (4) to do work, and the other part of the exhaust steam is conveyed to the low-temperature multi-effect seawater desalination device (13) to do work through the temperature and pressure reduction device (16);
the low-pressure cylinder (4), the exhaust steam of the low-pressure cylinder (4) is heated by a water supply system and then flows back to the boiler (1) to form exhaust steam circulation;
the system comprises a low-temperature multi-effect seawater desalination device (13), wherein the inlet of the low-temperature multi-effect seawater desalination device (13) is connected with an original seawater water taking pump (12), and the outlet of the low-temperature multi-effect seawater desalination device is connected with a fresh water delivery pump (14); the desalinated seawater is pressurized and output by a fresh water delivery pump (14), one part of the desalinated seawater is output as finished water, one part of the desalinated seawater is used as desuperheating water for heating steam and is delivered to a desuperheating pressure reducer (16), and the last part of the desalinated seawater is used as the consumption of a coal-fired unit and is delivered to a water supply system.
2. The system for realizing the cogeneration of water and electricity of the coal-fired power plant according to claim 1, wherein the water supply system comprises a condenser (6), a condensate pump (7), a low-pressure heater group (8), a feed pump (9) and a high-pressure heater group (10) which are connected in sequence; an inlet of the condenser (6) is connected with the exhaust steam of the low pressure cylinder (4); a fresh water delivery pump (14) pressurizes and delivers a part of desalinated seawater to an inlet pipeline of a condensate pump (7); the outlet of the high-pressure heater group (10) is connected with the boiler (1).
3. The system for realizing the cogeneration of water and electricity at the coal-fired power plant as recited in claim 1, wherein an outlet of the intermediate pressure cylinder (3) is provided with an intermediate and low pressure communicating pipe regulating valve (11) for regulating the extraction pressure and flow when the electrical load of the coal-fired unit is reduced.
4. The system for realizing the cogeneration of water and electricity at the coal-fired power plant as recited in claim 1, wherein a water ring vacuum pump set (15) for pumping out non-condensable gas is connected to the low-temperature multi-effect seawater desalination device (13).
5. The system for realizing the cogeneration of water and electricity of the coal-fired power plant as recited in claim 1, wherein the rotating shafts of the high pressure cylinder (2), the intermediate pressure cylinder (3) and the low pressure cylinder (4) are coaxially connected and drive the generator (5) to generate electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124611.2A CN111204833A (en) | 2020-02-27 | 2020-02-27 | Realize coal-fired power plant water and electricity cogeneration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010124611.2A CN111204833A (en) | 2020-02-27 | 2020-02-27 | Realize coal-fired power plant water and electricity cogeneration system |
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| CN111204833A true CN111204833A (en) | 2020-05-29 |
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| CN202010124611.2A Pending CN111204833A (en) | 2020-02-27 | 2020-02-27 | Realize coal-fired power plant water and electricity cogeneration system |
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