CN111603928B - Efficient, clean and flexible cooperative coal-fired power generation system and operation method - Google Patents
Efficient, clean and flexible cooperative coal-fired power generation system and operation method Download PDFInfo
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- CN111603928B CN111603928B CN202010445473.8A CN202010445473A CN111603928B CN 111603928 B CN111603928 B CN 111603928B CN 202010445473 A CN202010445473 A CN 202010445473A CN 111603928 B CN111603928 B CN 111603928B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a high-efficiency clean flexible cooperative coal-fired power generation system and an operation method thereof, wherein the system adopts an arrangement mode of separating parallel flues and grading economizers, and is provided with a flue gas adjusting baffle and an adjusting valve; the system can accurately adjust the temperature of the flue gas at the SCR inlet, realize the wide-load efficient denitration of the coal-fired generator set and improve the wide-load operation efficiency. In addition, the system can improve the variable load rate of the coal-fired generator set, and improves the system efficiency and the SCR denitration efficiency in the process of improving the variable load rate.
Description
Technical Field
The invention belongs to the field of coal-fired power generation, and particularly relates to a high-efficiency, clean and flexible synergistic coal-fired power generation system and an operation method.
Background
The method realizes efficient denitration under all working conditions, improves the variable load rate and improves the operation efficiency, and is the technical requirement of 'energy conservation and emission reduction' on coal burning power generation. However, the high efficiency, cleanliness and flexibility of coal-fired power generating units are mutually restricted. Because the SCR denitration catalyst has the requirement of a working temperature area, the inlet temperature of the SCR denitration catalyst is reduced when the load of a conventional coal-fired generator set is reduced, and the coal-fired generator set is difficult to realize wide-load high-efficiency denitration. Meanwhile, the operating efficiency of the coal-fired generator set during fast climbing is obviously reduced.
In recent years, China has achieved great achievements in new energy development, and the installed capacity of new energy power generation is rapidly increased. However, the instability of wind energy and solar energy causes strong fluctuation of output electric energy of solar photovoltaic and wind power generation, and huge power supply side load disturbance is caused to a power grid. To balance the power supply and demand, coal-fired power generating units need frequent deep variable load operation. Meanwhile, in order to improve the operation safety of the power grid, the coal-fired power generating unit needs to have variable load capacity of fast climbing.
The SCR denitration device is the denitration device of present mainstream, but SCR denitration catalyst has the temperature interval of suitable operation, and after SCR denitration device entry flue gas temperature deviated SCR denitration catalyst operation temperature zone, can cause denitration efficiency to show the reduction. It is this reason that the amount of NOx emissions is greatly increased when the coal-fired power plant is operating at low load. The existing technologies such as flue gas bypass, water supply bypass and the like generally have the problem of outstanding contradiction between high efficiency and cleanness. And when the unit is operated at a fast variable load, the SCR instantaneous denitration efficiency and the coal-fired power plant efficiency in the prior art are obviously reduced.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide an efficient, clean, flexible and cooperative coal-fired power generation system and an operation method thereof. The system can accurately adjust the temperature of the flue gas at the SCR inlet, realize the wide-load efficient denitration of the coal-fired generator set and improve the wide-load operation efficiency. In addition, the system can improve the variable load rate of the coal-fired generator set, and improves the system efficiency and the SCR denitration efficiency in the process of improving the variable load rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-efficiency clean flexible collaborative coal-fired power generation system comprises an economizer 2, an SCR denitration device 3 and a front economizer 4 which are sequentially arranged in a flue at the tail part of a boiler 1 along the flow direction of flue gas, wherein the rear flue of the front economizer 4 is divided into two parallel separated flues, one side of the separated flue is sequentially provided with a first flue gas baffle 51 and an air preheater 53 along the flow direction of the flue gas, and the other side of the separated flue is sequentially provided with a second flue gas baffle 52, a first shunt economizer 54 and a second shunt economizer 55 along the flow direction of the flue gas; the water outlet of the economizer 2 is connected with the water-cooled wall water supply inlet, the water inlet of the economizer 2 is connected with the water outlet of the pre-positioned economizer 4, and the water outlet of the pre-positioned economizer 4 is also connected with the water inlet of the pre-positioned economizer through a first water supply regulating valve 61; the water inlet of the pre-coal economizer 4 is connected with the water outlet of the first shunt coal economizer 54 and is also connected with the water outlet of the high-pressure heater group 7 through a second feed water regulating valve 62; the water inlet of the first diversion economizer 54 is connected with the water outlet of the second diversion economizer 55, and is also connected with the water outlet of the high-pressure heater group 7 through a third feed water regulating valve 63; the water inlet of the second diversion economizer 55 is connected with the water outlet of the water feeding pump 8 through a fourth water feeding regulating valve 64; the water inlet of the high-pressure heater group 7 is connected with the water outlet of the feed pump 8.
The area of the pre-coal economizer 4 is 0.2 to 0.4 times of the area of the coal economizer 2.
The area of the first diversion economizer 54 is 0.5 to 0.8 times of the area of the second diversion economizer 55.
The first water supply regulating valve 61, the second water supply regulating valve 62, the third water supply regulating valve 63 and the fourth water supply regulating valve 64 are electric automatic regulating valves.
According to the operation method of the efficient, clean, flexible and cooperative coal-fired power generation system, the inlet flue gas temperature of the SCR denitration device 3 is adjusted by adjusting the first water supply adjusting valve 61 to meet the working temperature interval of the SCR denitration device 3, the specific adjusting method is that the inlet flue gas temperature of the SCR denitration device 3 is measured, and if the measured inlet flue gas temperature of the SCR denitration device 3 is higher than the highest working temperature of the SCR denitration device 3, the opening degree of the first water supply adjusting valve 61 is increased; measuring and measuring the inlet flue gas temperature of the SCR denitration device 3, and reducing the opening degree of the first water supply regulating valve 61 if the inlet flue gas temperature is lower than the working temperature of the SCR denitration device 3;
when the coal-fired power generation system needs to rapidly increase the load, the opening degree of the fourth water supply regulating valve 64 is increased, the opening degree of the third water supply regulating valve 63 is reduced, the opening degree of the second water supply regulating valve 62 is increased, and the opening degree of the first water supply regulating valve 61 is reduced;
the flue gas temperature at the flue gas outlet at the tail part of the boiler 1 is the lowest by adjusting the opening degrees of the first flue gas baffle 51 and the second flue gas baffle 52.
The smoke flow of the second smoke baffle 52 accounts for 20-40% of the total smoke flow.
The working temperature range of the SCR denitration device 3 is 300-400 ℃.
The system adopts an arrangement mode of separating parallel flues and grading economizers, and is provided with a flue gas adjusting baffle and an adjusting valve. The system can accurately adjust the temperature of the flue gas at the SCR inlet, realize the wide-load efficient denitration of the coal-fired generator set and improve the wide-load operation efficiency. In addition, the system can improve the variable load rate of the coal-fired generator set, and improves the system efficiency and the SCR denitration efficiency in the process of improving the variable load rate.
Compared with the prior art, the invention has the following advantages:
(1) the invention can enlarge the denitration operation interval of the SCR system and realize high-efficiency denitration under all working conditions;
(2) compared with the flue gas bypass technology, the invention can improve the boiler efficiency by 0.3-0.8%;
(3) the invention can realize the variable load operation of the coal-fired generator set with the load of more than 3 percent of rated load/minute, and simultaneously improves the power generation efficiency and the denitration efficiency of the coal-fired generator set during the rapid variable load operation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a comparative graph of SCR inlet flue gas temperature for a coal-fired power generating unit.
Fig. 3 is a graph showing the variation trend of the output power of the present invention for a case coal-fired power generating unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the efficient, clean, flexible and synergistic coal-fired power generation system comprises an economizer 2, an SCR denitration device 3 and a pre-economizer 4 which are sequentially arranged in a flue at the tail of a boiler 1 along the flow direction of flue gas, wherein a rear flue of the pre-economizer 4 is divided into two parallel separated flues, one side of each separated flue is sequentially provided with a first flue gas baffle 51 and an air preheater 53 along the flow direction of flue gas, and the other side of each separated flue is sequentially provided with a second flue gas baffle 52, a first diversion economizer 54 and a second diversion economizer 55 along the flow direction of flue gas; the water outlet of the economizer 2 is connected with the water-cooled wall water supply inlet, the water inlet of the economizer 2 is connected with the water outlet of the pre-positioned economizer 4, and the water outlet of the pre-positioned economizer 4 is also connected with the water inlet of the pre-positioned economizer through a first water supply regulating valve 61; the water inlet of the pre-coal economizer 4 is connected with the water outlet of the first shunt coal economizer 54 and is also connected with the water outlet of the high-pressure heater group 7 through a second feed water regulating valve 62; the water inlet of the first diversion economizer 54 is connected with the water outlet of the second diversion economizer 55, and is also connected with the water outlet of the high-pressure heater group 7 through a third feed water regulating valve 63; the water inlet of the second diversion economizer 55 is connected with the water outlet of the water feeding pump 8 through a fourth water feeding regulating valve 64; the water inlet of the high-pressure heater group 7 is connected with the water outlet of the feed pump 8.
As a preferred embodiment of the invention, the area of the pre-coal economizer 4 is 0.2 to 0.4 times of the area of the coal economizer 2, so that the temperature of the flue gas at the inlet of the SCR denitration device 3 can be maintained in a proper working temperature zone in the whole working condition range.
As the preferred embodiment of the invention, the area of the first diversion economizer 54 is 0.5 to 0.8 times of the area of the second diversion economizer 55, so that the matching relation between the flue gas heat release and the working medium system can be improved, the energy utilization efficiency of the system can be improved, and the system investment can be reduced.
As a preferred embodiment of the present invention, the first water supply regulating valve 61, the second water supply regulating valve 62, the third water supply regulating valve 63, and the fourth water supply regulating valve 64 are electric automatic regulating valves, so that the regulation performance of the system can be enhanced.
According to the operation method of the efficient, clean, flexible and cooperative coal-fired power generation system, the inlet flue gas temperature of the SCR denitration device 3 is adjusted by adjusting the first water supply adjusting valve 61 to meet the working temperature interval of the SCR denitration device 3, the specific adjusting method is that the inlet flue gas temperature of the SCR denitration device 3 is measured, and if the measured inlet flue gas temperature of the SCR denitration device 3 is higher than the highest working temperature of the SCR denitration device 3, the opening degree of the first water supply adjusting valve 61 is increased; measuring and measuring the inlet flue gas temperature of the SCR denitration device 3, and reducing the opening degree of the first water supply regulating valve 61 if the inlet flue gas temperature is lower than the working temperature of the SCR denitration device 3;
when the coal-fired power generation system needs to rapidly increase the load, the opening degree of the fourth water supply regulating valve 64 is increased, the opening degree of the third water supply regulating valve 63 is reduced, the opening degree of the second water supply regulating valve 62 is increased, and the opening degree of the first water supply regulating valve 61 is reduced;
the flue gas temperature at the flue gas outlet at the tail part of the boiler 1 is the lowest by adjusting the opening degrees of the first flue gas baffle 51 and the second flue gas baffle 52.
The working temperature range of the SCR denitration device 3 is 300-400 ℃.
As a preferred embodiment of the present invention, the flue gas flow rate of the second flue gas baffle 52 accounts for 20% to 40% of the total flue gas flow rate, so that the boiler has the highest operation efficiency.
The system can switch the system configuration when the unit operates in different intervals, so that the temperature of the flue gas at the SCR inlet is maintained in the operation interval with the most suitable SCR denitration catalyst activity. As shown in FIG. 2, the system and the operation method of the invention are adopted by a certain coal-fired power generating unit, and the flue gas temperature at the SCR inlet can be controlled to be above 320 ℃ in the whole load rate interval of 0.3-1.0 through calculation. Meanwhile, the invention can improve the efficiency of the coal-fired generator set, maintain the boiler efficiency to be more than 92% under each load rate, and improve the boiler efficiency by 0.3% -0.8% compared with the flue gas bypass technology.
In addition, the invention can improve the climbing speed of the unit, as shown in fig. 3, a certain coal-fired power generating unit adopts the system and the operation method of the invention, the variable load speed can be improved to more than 3% of rated load/minute through calculation, and the denitration efficiency of the SCR device can be ensured by adjusting the opening degree of the related valve.
Claims (7)
1. The utility model provides a high-efficient clean nimble coal-fired power generation system in coordination which characterized in that: the flue gas denitration device comprises an economizer (2), an SCR denitration device (3) and a front economizer (4) which are sequentially arranged in a flue at the tail part of a boiler (1) along the flow direction of flue gas, wherein the rear flue of the front economizer (4) is divided into two parallel separated flues, one separated flue is sequentially provided with a first flue gas baffle (51) and an air preheater (53) along the flow direction of the flue gas, and the other separated flue is sequentially provided with a second flue gas baffle (52), a first shunt economizer (54) and a second shunt economizer (55) along the flow direction of the flue gas;
the water outlet of the economizer (2) is connected with the water-cooling wall water supply inlet, the water inlet of the economizer (2) is connected with the water outlet of the preposed economizer (4), and is also connected with the water inlet of the preposed economizer (4) through a first water supply regulating valve (61); the water inlet of the preposed economizer (4) is connected with the water outlet of the first shunt economizer (54) and is also connected with the water outlet of the high-pressure heater group (7) through a second water supply regulating valve (62); a water inlet of the first diversion economizer (54) is connected with a water outlet of the second diversion economizer (55), and is also connected with a water outlet of the high-pressure heater group (7) through a third water supply regulating valve (63); the water inlet of the second diversion economizer (55) is connected with the water outlet of the water feeding pump (8) through a fourth water feeding regulating valve (64); the water inlet of the high-pressure heater group (7) is connected with the water outlet of the water feeding pump (8).
2. The efficient clean flexible synergistic coal-fired power generation system of claim 1, wherein: the area of the pre-coal economizer (4) is 0.2 to 0.4 times of the area of the coal economizer (2).
3. The efficient clean flexible synergistic coal-fired power generation system of claim 1, wherein: the area of the first diversion economizer (54) is 0.5 to 0.8 times of that of the second diversion economizer (55).
4. The efficient clean flexible synergistic coal-fired power generation system of claim 1, wherein: the first water supply regulating valve (61), the second water supply regulating valve (62), the third water supply regulating valve (63) and the fourth water supply regulating valve (64) are electric automatic regulating valves.
5. A method of operating a high efficiency clean flexible cogeneration system according to any one of claims 1 to 4, wherein: the inlet flue gas temperature of the SCR denitration device (3) is adjusted by adjusting the first water supply adjusting valve (61) to meet the working temperature interval of the SCR denitration device (3), the specific adjusting method is that the inlet flue gas temperature of the SCR denitration device (3) is measured, and if the measured inlet flue gas temperature of the SCR denitration device (3) is higher than the highest working temperature of the SCR denitration device (3), the opening degree of the first water supply adjusting valve (61) is increased; measuring the inlet flue gas temperature of the SCR denitration device (3), and reducing the opening degree of a first water supply regulating valve (61) if the inlet flue gas temperature is lower than the working temperature of the SCR denitration device (3);
when the coal-fired power generation system needs to rapidly increase the load, the opening degree of a fourth water supply regulating valve (64) is increased, the opening degree of a third water supply regulating valve (63) is reduced, the opening degree of a second water supply regulating valve (62) is increased, and the opening degree of a first water supply regulating valve (61) is reduced;
the flue gas temperature of the flue gas outlet at the tail part of the boiler (1) is lowest by adjusting the opening degrees of the first flue gas baffle (51) and the second flue gas baffle (52).
6. The method of operation of claim 5, wherein: the smoke flow of the second smoke baffle (52) accounts for 20-40% of the total smoke flow.
7. The method of operation of claim 5, wherein: the working temperature range of the SCR denitration device (3) is 300-400 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010445473.8A CN111603928B (en) | 2020-05-24 | 2020-05-24 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
| PCT/CN2021/078894 WO2021238322A1 (en) | 2020-05-24 | 2021-03-03 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
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| CN202010445473.8A CN111603928B (en) | 2020-05-24 | 2020-05-24 | Efficient, clean and flexible cooperative coal-fired power generation system and operation method |
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| CN111603928A CN111603928A (en) | 2020-09-01 |
| CN111603928B true CN111603928B (en) | 2021-07-06 |
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- 2021-03-03 WO PCT/CN2021/078894 patent/WO2021238322A1/en active Application Filing
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| WO2021238322A1 (en) | 2021-12-02 |
| CN111603928A (en) | 2020-09-01 |
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