CN102865572A - Flue gas recirculating temperature-regulation system of novel double reheating power station boiler - Google Patents
Flue gas recirculating temperature-regulation system of novel double reheating power station boiler Download PDFInfo
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- CN102865572A CN102865572A CN2012103914195A CN201210391419A CN102865572A CN 102865572 A CN102865572 A CN 102865572A CN 2012103914195 A CN2012103914195 A CN 2012103914195A CN 201210391419 A CN201210391419 A CN 201210391419A CN 102865572 A CN102865572 A CN 102865572A
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Abstract
The invention discloses a flue gas recirculating temperature-regulation system of a novel double reheating power station boiler and relates to a regulation system for regulating the main steam temperature, the single reheating steam temperature and the double reheating steam temperature of a double reheating power station boiler which is used by a thermal power station. The system comprises a temperature-regulation flue-air injector set, a temperature-regulation flue-air header, a temperature-regulation flue-air duct, a temperature-regulation air-flue ejector, an ejector flue gas suction side shutoff baffle plate, an ejector thermal primary air regulation baffle plate, a thermal primary air duct and a distributed control system (DCS), wherein the primary air regulation baffle plate is opened when the boiler load is lower than 70% of the boiler maximum continuous rating (BMCR), and the weight flow of a temperature-regulation flue-air mixture is adjustable within a range of 0-15% of the BMCR flue gas weight flow. By the aid of the system, the problem that the double reheating steam outlet temperature is difficult to reach the designed value under working conditions of 50%-60% of the BMCR when a flue gas recirculating fan is not used in the prior art is solved, the energy consumption required for flue gas recirculating temperature-regulation is greatly reduced, the infrastructure investment is saved, the plant electrical consumption is saved, the system is wear-resistant, and operation and maintenance costs are saved.
Description
(1) technical field:
A kind of novel secondary of the present invention again stove cigarette recirculation thermoregulating system of thermo-power station boiler relates to main stripping temperature, the single reheat stripping temperature of the double reheat station boiler that a kind of thermal power station uses, the regulating system of double reheat stripping temperature.
(2) background technology:
The double reheat station boiler that the thermal power station of prior art uses is used for the Turbo-generator Set steam supply to double reheat, and the design load of typical boiler side master stripping temperature/single reheat stripping temperature/double reheat stripping temperature is 605 ℃/623 ℃/623 ℃.
The Turbo-generator Set of typical double reheat is furnished with level Four high-pressure heater and the steam condenser that separates, and boiler feed temperature is up to 330 ℃; The inlet temperature of single reheat device and the inlet temperature of secondary reheater are generally at 420～440 ℃.
The main steam method of temperature control of prior art: coal-water ratio+spray desuperheating, can guarantee that the superheated steam outlet temperature all can reach design load under 30%～100%BMCR operating mode; The reheated steam method of temperature control: gas baffle+tilting burner+spray desuperheating, can guarantee that the single reheat steam exit temperature can reach design load under 50%～100%BMCR operating mode; But the double reheat steam exit temperature can only can reach design load under 65%～100%BMCR operating mode.
In order to make the double reheat steam exit temperature also can reach design load under 50%～65%BMCR operating mode, prior art adopts the recirculation of stove cigarette, the flue gas volume flow in the increase, under the underload, and the quantity of heat convection that increases secondary reheater is reached.The outlet that the entrance of stove cigarette recirculation blower can be connected on economizer also can be connected on the outlet of deduster, and the outlet of stove cigarette recirculation blower connects burner hearth furnace hopper bottom.When the entrance of stove cigarette recirculation blower is connected on the outlet of economizer, high dust, than elevated operating temperature, lower flue gas severe, higher revolutions the reliability of stove cigarette recirculation blower is reduced, power consumption increases; Air preheater cigarette effluent amount increased by 10% to 20% when the entrance of stove cigarette recirculation blower was connected on the outlet of deduster, can cause that exhaust gas temperature significantly raises, and boiler efficiency descends.
(3) summary of the invention:
Technical problem to be solved:
The thermoregulating system of the double reheat station boiler of prior art is not as using stove cigarette recirculation blower, and the double reheat steam exit temperature is difficult to reach design load under 50%～65%BMCR operating mode; When the entrance of stove cigarette recirculation blower is connected on the outlet of economizer, high dust, than elevated operating temperature, low flue gas severe, higher revolutions the reliability of stove cigarette recirculation blower is reduced, power consumption increases; Air preheater cigarette effluent amount increased by 10% to 20% when the entrance of stove cigarette recirculation blower was connected on the outlet of deduster, can cause that exhaust gas temperature raises, and boiler efficiency descends; Come cooled flue gas for reducing exhaust gas temperature from steam turbine side introducing condensate water and/or the lower feedwater of temperature, can increase again the condensing loss of steam turbine, the hear rate of rising steam turbine.
Solve the technical scheme that its technical problem adopts:
The purpose of this invention is to provide a kind of novel secondary again the stove cigarette recirculation thermoregulating system of thermo-power station boiler take and the diverse technology path of prior art, the thermoregulating system that solves the double reheat station boiler of prior art does not use stove cigarette recirculation blower, and the double reheat steam exit temperature is difficult to reach the problem of design load under 50%～65%BMCR operating mode.
A kind of novel secondary of the present invention again stove cigarette recirculation thermoregulating system of thermo-power station boiler comprises temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), and plate washer (8), injector heat primary air controllable register (10), heat primary air road (11), DCS control system are turn-offed in temperature adjustment cigarette wind air channel (7), temperature adjustment wind-cigarette injector (9), injector flue gas suction side; In boiler, during underload, heat primary air enters temperature adjustment wind-cigarette injector (9) through heat primary air road (11), injector heat primary air controllable register (10), open injector flue gas suction side and turn-off plate washer (8), extract flue gas behind mouthful (6) the suction boiler economizers (3) out from the Boiler Furnace cigarette, cigarette wind mixture connects air channel (7), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind nozzle sets (4) through temperature adjustment cigarette wind and enters boiler furnace (1); Temperature adjustment cigarette wind nozzle sets (4) is arranged in that 3m to 4m locates under the boiler platen superheater (2), only change Radiant exothermicity and the quantity of heat convection in the burner hearth ratio, increase the flue gas volume flow, substantially do not participate in and disturb the low nitrogen burning process; When the boiler high load capacity, close injector flue gas suction side and turn-off plate washer (8), crack injector heat primary air controllable register (10) is to avoid temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind to connect air channel (7) scaling loss; The DCS control system is adjusted the aperture of injector heat primary air controllable register (10) so that the double reheat stripping temperature reaches design load by boiler load, double reheat stripping temperature, a wind controllable register (10) is opened when boiler load is lower than 70%BMCR, and the weight flow of temperature adjustment cigarette wind mixture is adjustable between 0 to 15%BMCR flue gas weight flow.
The beneficial effect of the invention:
● the thermoregulating system that solves the double reheat station boiler of prior art does not use stove cigarette recirculation blower, and the double reheat steam exit temperature is difficult to reach the problem of design load under 50%～65%BMCR operating mode;
● air preheater cigarette effluent amount increases by 10% to 20% and causes that exhaust gas temperature raises boiler efficiency decline problem when avoiding the entrance of stove cigarette recirculation blower to be connected on the outlet of deduster;
● cigarette wind mixture temperature flue-gas temperature behind the deduster, temperature adjustment process exergy (fire with) loss reduces;
● increased the thermal capacity of the empty side of air preheater, exhaust gas temperature is downward trend;
● need not to come cooled flue gas to avoid the condensing loss of steam turbine to increase from steam turbine side introducing condensate water and/or the lower feedwater of temperature;
● can save the huge investment of bypass economizer and/or the low-pressure coal saver behind the preheater of air preheater;
● without stove cigarette recirculation blower, save capital expenditure, save station service, resistance to wear, save operation and maintenance cost;
● quite less than the flue gas pressure reduction between boiler furnace hopper bottom and the deduster outlet, the needed energy consumption of stove cigarette recirculation temperature adjustment greatly reduces the flue gas pressure reduction between temperature adjustment cigarette wind nozzle sets and the economizer exit;
● avoid low-temperature furnace smoke to enter burner hearth furnace hopper bottom to the interference of low nitrogen burning system.
(4) description of drawings:
Fig. 1 is temperature adjustment cigarette wind nozzle sets layout drawing ∏ type stove scheme;
Fig. 2 is temperature adjustment cigarette wind nozzle sets layout drawing tower-type furnace scheme;
Fig. 3 is stove cigarette recirculation thermoregulating system figure.
At Fig. 1:
1 burner hearth, 2 pendant superheaters,
3 economizers, 4 temperature adjustment cigarette wind nozzle sets,
5 temperature adjustment cigarette wind headers, 6 stove cigarettes extract out mouthful,
7 temperature adjustment cigarette wind connect air channel, 8 injector flue gas suction sides turn-off plate washer,
9 temperature adjustments wind-cigarette injector, 10 injector heat primary air controllable registers,
11 heat primary air roads.
(5) specific embodiment:
Embodiment 1:
Now in conjunction with Fig. 1 and Fig. 3, with a 1000MW grade, the design load of main stripping temperature/single reheat stripping temperature/double reheat stripping temperature is that 605 ℃/623 ℃/623 ℃ double reheat ∏ type station boiler is the optimal way that the example explanation realizes invention.
A kind of novel secondary of the present invention again stove cigarette recirculation thermoregulating system of thermo-power station boiler comprises temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), and plate washer (8), injector heat primary air controllable register (10), heat primary air road (11), DCS control system are turn-offed in temperature adjustment cigarette wind air channel (7), temperature adjustment wind-cigarette injector (9), injector flue gas suction side; In boiler, during underload, heat primary air enters temperature adjustment wind-cigarette injector (9) through heat primary air road (11), injector heat primary air controllable register (10), open injector flue gas suction side and turn-off plate washer (8), extract flue gas behind mouthful (6) the suction boiler economizers (3) out from the Boiler Furnace cigarette, cigarette wind mixture connects air channel (7), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind nozzle sets (4) through temperature adjustment cigarette wind and enters boiler furnace (1); Temperature adjustment cigarette wind nozzle sets (4) is arranged in that 3m to 4m locates under the boiler platen superheater (2), only change Radiant exothermicity and the quantity of heat convection in the burner hearth ratio, increase the flue gas volume flow, substantially do not participate in and disturb the low nitrogen burning process; When the boiler high load capacity, close injector flue gas suction side and turn-off plate washer (8), crack injector heat primary air controllable register (10) is to avoid temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind to connect air channel (7) scaling loss; The DCS control system is adjusted the aperture of injector heat primary air controllable register (10) so that the double reheat stripping temperature reaches design load by boiler load, double reheat stripping temperature, a wind controllable register (10) is opened when boiler load is lower than 70%BMCR, and the weight flow of temperature adjustment cigarette wind mixture is adjustable between 0 to 15%BMCR flue gas weight flow.
Temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) are arranged in water-cooling wall smoke folded angle below behind the ∏ type station boiler, apart from 3 to 4m places, pendant superheater (2) bottom, temperature adjustment cigarette wind nozzle is wide uniform along stove, two groups were arranged symmetrically with about temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) were divided into, the cigarette wind mixture outlet peak flow rate (PFR) 40m/s of temperature adjustment cigarette wind nozzle sets (4); The total head liter that the cigarette wind mixture outlet of temperature adjustment wind-cigarette injector (9) and stove cigarette are extracted out between mouthful (6) is no more than 1.5kPa, the highest blast of the heat primary air nozzle of temperature adjustment wind-cigarette injector (9) is not less than 12kPa, heat primary air can accomplish 1: 4 the injection ratio of flue gas, and two are arranged symmetrically with about temperature adjustment wind-cigarette injector (9); The flue gas flow rate that the stove cigarette is extracted mouthful (6) out is no more than 40m/s; Temperature adjustment cigarette wind air channel (7) connects the outlet of temperature adjustment cigarette wind header (5) and temperature adjustment wind-cigarette injector (9), and temperature adjustment cigarette wind air channel (7) comprises the corrugated-type expansion joint group; Injector heat primary air controllable register (10) rotates controllable register for metal sealing; DCS control system hardware and generating set share, and software is a sub-systems of generator set control software, and the aperture with injector heat primary air controllable register (10) of opening and closing of plate washer (8) is turn-offed in control injector flue gas suction side.
Embodiment 2:
Now in conjunction with Fig. 2 and Fig. 3, with a 1000MW grade, the design load of main stripping temperature/single reheat stripping temperature/double reheat stripping temperature is that 605 ℃/623 ℃/623 ℃ the tower station boiler of double reheat is the optimal way that the example explanation realizes invention.
A kind of novel secondary of the present invention again stove cigarette recirculation thermoregulating system of thermo-power station boiler comprises temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), and plate washer (8), injector heat primary air controllable register (10), heat primary air road (11), DCS control system are turn-offed in temperature adjustment cigarette wind air channel (7), temperature adjustment wind-cigarette injector (9), injector flue gas suction side; In boiler, during underload, heat primary air enters temperature adjustment wind-cigarette injector (9) through heat primary air road (11), injector heat primary air controllable register (10), open injector flue gas suction side and turn-off plate washer (8), extract flue gas behind mouthful (6) the suction boiler economizers (3) out from the Boiler Furnace cigarette, cigarette wind mixture connects air channel (7), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind nozzle sets (4) through temperature adjustment cigarette wind and enters boiler furnace (1); Temperature adjustment cigarette wind nozzle sets (4) is arranged in that 3m to 4m locates under the boiler platen superheater (2), only change Radiant exothermicity and the quantity of heat convection in the burner hearth ratio, increase the flue gas volume flow, substantially do not participate in and disturb the low nitrogen burning process; When the boiler high load capacity, close injector flue gas suction side and turn-off plate washer (8), crack injector heat primary air controllable register (10) is to avoid temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind to connect air channel (7) scaling loss; The DCS control system is adjusted the aperture of injector heat primary air controllable register (10) so that the double reheat stripping temperature reaches design load by boiler load, double reheat stripping temperature, a wind controllable register (10) is opened when boiler load is lower than 70%BMCR, and the weight flow of temperature adjustment cigarette wind mixture is adjustable between 0 to 15%BMCR flue gas weight flow.
Temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) are arranged in tower station boiler side wall pendant superheater (2) below, lower to 3 to 4m places apart from pendant superheater (2), temperature adjustment cigarette wind nozzle is uniform in the side wall level, temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) respectively have 2 groups, be arranged symmetrically in respectively the left and right sides water-cooling wall, the cigarette wind mixture outlet peak flow rate (PFR) 40m/s of temperature adjustment cigarette wind nozzle sets (4); The total head liter that the cigarette wind mixture outlet of temperature adjustment wind-cigarette injector (9) and stove cigarette are extracted out between mouthful (6) is no more than 2.0kPa, the highest blast of the heat primary air nozzle of temperature adjustment wind-cigarette injector (9) is not less than 12kPa, heat primary air can accomplish 1: 3 the injection ratio of flue gas, and two are arranged symmetrically with about temperature adjustment wind-cigarette injector (9); The flue gas flow rate that the stove cigarette is extracted mouthful (6) out is no more than 40m/s; Temperature adjustment cigarette wind air channel (7) connects the outlet of temperature adjustment cigarette wind header (5) and temperature adjustment wind-cigarette injector (9), and temperature adjustment cigarette wind air channel (7) comprises the corrugated-type expansion joint group; Injector heat primary air controllable register (10) rotates controllable register for metal sealing; DCS control system hardware and generating set share, and software is a sub-systems of generator set control software, and the aperture with injector heat primary air controllable register (10) of opening and closing of plate washer (8) is turn-offed in control injector flue gas suction side.
Claims (7)
1. the novel secondary stove cigarette recirculation thermoregulating system of thermo-power station boiler again, it is characterized in that: comprise temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), plate washer (8), injector heat primary air controllable register (10), heat primary air road (11), DCS control system are turn-offed in temperature adjustment cigarette wind air channel (7), temperature adjustment wind-cigarette injector (9), injector flue gas suction side; In boiler, during underload, heat primary air enters temperature adjustment wind-cigarette injector (9) through heat primary air road (11), injector heat primary air controllable register (10), open injector flue gas suction side and turn-off plate washer (8), extract flue gas behind mouthful (6) the suction boiler economizers (3) out from the Boiler Furnace cigarette, cigarette wind mixture connects air channel (7), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind nozzle sets (4) through temperature adjustment cigarette wind and enters boiler furnace (1); Temperature adjustment cigarette wind nozzle sets (4) is arranged in that 3m to 4m locates under the boiler platen superheater (2), only change Radiant exothermicity and the quantity of heat convection in the burner hearth ratio, increase the flue gas volume flow, substantially do not participate in and disturb the low nitrogen burning process; When the boiler high load capacity, close injector flue gas suction side and turn-off plate washer (8), crack injector heat primary air controllable register (10) is to avoid temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5), temperature adjustment cigarette wind to connect air channel (7) scaling loss; The DCS control system is adjusted the aperture of injector heat primary air controllable register (10) so that the double reheat stripping temperature reaches design load by boiler load, double reheat stripping temperature, a wind controllable register (10) is opened when boiler load is lower than 70%BMCR, and the weight flow of temperature adjustment cigarette wind mixture is adjustable between 0 to 15%BMCR flue gas weight flow.
2. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again, it is characterized in that described temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) are arranged in water-cooling wall smoke folded angle below behind the ∏ type station boiler, apart from 3 to 4m places, pendant superheater (2) bottom, temperature adjustment cigarette wind nozzle is wide uniform along stove, two groups were arranged symmetrically with about temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) were divided into, the cigarette wind mixture outlet peak flow rate (PFR) 40m/s of temperature adjustment cigarette wind nozzle sets (4).
3. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again, it is characterized in that described temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) is arranged in tower station boiler side wall pendant superheater (2) below, lower to 3 to 4m places apart from pendant superheater (2), temperature adjustment cigarette wind nozzle is uniform in the side wall level, temperature adjustment cigarette wind nozzle sets (4), temperature adjustment cigarette wind header (5) respectively has 2 groups, be arranged symmetrically in respectively the left and right sides water-cooling wall, the cigarette wind mixture outlet peak flow rate (PFR) 40m/s of temperature adjustment cigarette wind nozzle sets (4).
4. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again, it is characterized in that described temperature adjustment cigarette wind air channel (7) connects the outlet of temperature adjustment cigarette wind header (5) and temperature adjustment wind-cigarette injector (9), temperature adjustment cigarette wind air channel (7) comprises the corrugated-type expansion joint group.
5. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again is characterized in that two are arranged symmetrically with about described temperature adjustment wind-cigarette injector (9).
6. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again is characterized in that described stove cigarette extracts the flue gas flow rate of mouthful (6) out and be no more than 40m/s.
7. a kind of novel secondary according to claim 1 stove cigarette recirculation thermoregulating system of thermo-power station boiler again is characterized in that described injector heat primary air controllable register (10) is metal sealing rotation controllable register.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210391419.5A CN102865572B (en) | 2012-10-16 | 2012-10-16 | Flue gas recirculating temperature-regulation system of novel double reheating power station boiler |
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| CN201210391419.5A CN102865572B (en) | 2012-10-16 | 2012-10-16 | Flue gas recirculating temperature-regulation system of novel double reheating power station boiler |
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| CN102865572B CN102865572B (en) | 2014-07-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105114940A (en) * | 2015-09-21 | 2015-12-02 | 章礼道 | Jet flue gas recycling method for preventing spray opening burning loss of secondary reheating boiler |
| CN112797398A (en) * | 2020-12-31 | 2021-05-14 | 大唐郓城发电有限公司 | Ultra-supercritical secondary reheating unit boiler temperature regulating system |
| CN112944323A (en) * | 2020-12-31 | 2021-06-11 | 大唐郓城发电有限公司 | 630 ℃ double reheat boiler three-flue control method |
| CN113108272A (en) * | 2021-05-24 | 2021-07-13 | 西安热工研究院有限公司 | Boiler regulation and control air system for injecting flue gas |
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| CN105114940A (en) * | 2015-09-21 | 2015-12-02 | 章礼道 | Jet flue gas recycling method for preventing spray opening burning loss of secondary reheating boiler |
| CN112797398A (en) * | 2020-12-31 | 2021-05-14 | 大唐郓城发电有限公司 | Ultra-supercritical secondary reheating unit boiler temperature regulating system |
| CN112944323A (en) * | 2020-12-31 | 2021-06-11 | 大唐郓城发电有限公司 | 630 ℃ double reheat boiler three-flue control method |
| CN113108272A (en) * | 2021-05-24 | 2021-07-13 | 西安热工研究院有限公司 | Boiler regulation and control air system for injecting flue gas |
| CN113108272B (en) * | 2021-05-24 | 2023-01-31 | 西安热工研究院有限公司 | Boiler regulation and control air system for injecting flue gas |
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| CN102865572B (en) | 2014-07-16 |
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