CN213577455U - Stable denitration device commissioning system for shutdown emergency operation of coal electric unit without stopping furnace - Google Patents
Stable denitration device commissioning system for shutdown emergency operation of coal electric unit without stopping furnace Download PDFInfo
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- CN213577455U CN213577455U CN202022457922.9U CN202022457922U CN213577455U CN 213577455 U CN213577455 U CN 213577455U CN 202022457922 U CN202022457922 U CN 202022457922U CN 213577455 U CN213577455 U CN 213577455U
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Abstract
The invention discloses a stable operation system of a denitration device for emergency operation of a coal-electric unit without shutdown, wherein a heating steam source of a high-pressure heater group is from a cold reheat steam main pipe of a coal-fired generator group, main steam and reheat steam which are reduced in pressure and temperature; a heating steam source of the deaerator is taken from a cold re-steam main pipe of the coal-fired generator set; one part of the water side outlet of the high-pressure heater group enters a boiler to complete steam-water thermodynamic cycle, and the other part of the water side outlet of the high-pressure heater group is used as desuperheating water to be mixed with main steam and reheated steam which are subjected to pressure reduction and temperature reduction to be used as heating steam sources and is conveyed to a No. 1 high-pressure heater and a No. 3 high-pressure heater; a coal economizer is arranged in a boiler of the coal-fired generator set, and flue gas at the outlet of the coal economizer enters a flue gas denitration device. In the invention, under the operation mode that the unit is stopped and not stopped, the deaerator, the No. 3 high-pressure heater and the No. 1 high-pressure heater are arranged, the temperature of the inlet of the boiler is raised, and the reheating steam is used for heating the temperature of the flue gas at the inlet of the denitration device, so that the combined action of the deaerator, the No. 3 high-pressure heater and the No. 1 high-pressure heater ensures that the denitration effect of the flue gas of the boiler and the pollutant emission reach the standard under.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of coal-fired power generation, and relates to a stable operation system of a denitration device for emergency operation of a coal-electric unit without shutdown.
[ background of the invention ]
The design specification of large and medium-sized thermal power plants (GB50660-2011) specifies that: the cogeneration unit should give consideration to two functions of power generation and heat supply in design, and should have higher heat supply reliability during external heat supply. For the heat supply type steam turbine, one machine is preferably provided with one furnace, when one steam boiler with the largest capacity is stopped, if the external steam supply capacity of the other boilers cannot meet the requirements of 100 percent of production steam consumption and 60 to 75 percent (the upper limit is taken in severe cold regions) of winter heating, ventilation and domestic heat required by continuous production of thermal users, other standby heat sources are configured by a heat supply network. When equipment such as a steam turbine and a generator of a heat supply unit breaks down in a heat supply period and needs to be overhauled, the problems that heat supply does not reach the standard or heat supply stops, steam supply stops and the like can be caused, heating feeling of residents is influenced, production loss of enterprises is caused, and social influence is large.
The high-low pressure bypass combined heat supply technology can realize the goal that the coal-fired power generating unit can still supply heat to the external residents in a centralized way under the fault conditions of the steam turbine and the generator: the boiler and the auxiliary machines are operated, the steam turbine and the generator are shut down, the heat recovery system is put into operation or shut down according to specific requirements and steam source conditions, feed water enters the boiler to be heated, outlet new steam enters a cold re-steam main pipe after being subjected to temperature and pressure reduction through a high-pressure bypass, and then enters a boiler reheater to be heated for the second time, and the operation condition is called as the emergency operation condition without shutdown.
When the coal-fired power generator set is stopped and does not stop, the power of the generator of the coal-fired power generator set is reduced to zero, the heat conservation principle is followed, the heat released by the boiler is used for heating water supply for the thermodynamic system, and the rest heat is used for heating and supplying heat for the outside. The main steam, cold re-steam, hot re-steam and heating steam pipeline steam parameters and the through-flow capacity are limited, and the boiler load is lower under the condition that the unit stops and does not stop, and is about 20-40% of the rated load. The steam turbine heat recovery system is characterized in that except for the high pressure steam extraction of No. 2 with the steam source taken from the cold recovery main pipe, other steam sources are all taken from the through flow of the steam turbine, so that the steam side of other high pressure heaters is stopped in the working condition of stopping the boiler without stopping the boiler except for the high pressure steam extraction of No. 2, the feed water temperature at the inlet of the boiler is obviously reduced, and the temperature of the outlet flue gas is obviously reduced due to the increase of the heat exchange temperature difference in the economizer. Factors such as low boiler load, low feedwater temperature lead to denitrification facility entry flue gas temperature to reduce by a wide margin, and skew catalysis high efficiency operating temperature interval makes catalyst activity reduce, and denitration efficiency descends to cause the ammonia escape rate to increase, nitrogen oxide NOx discharges substandard phenomenon, causes serious environmental protection problem.
At present, no operation engineering case of stopping the furnace without stopping the furnace exists, and no public reported technical scheme for stably putting the denitration device into operation is provided.
Because the high-efficient operating temperature interval of catalyst is influenced by material intrinsic characteristic itself, guarantee boiler flue gas denitration effect and make pollutant emission up to standard under the low-load, the key lies in promoting the flue gas temperature. Aiming at the problems, the invention provides a stable operation system of a denitration device for realizing shutdown and non-shutdown of a coal-fired generator set, which mainly starts from two aspects of raising the feed water temperature and reducing the heat release of upstream flue gas and raises the inlet flue gas temperature of the denitration device.
[ summary of the invention ]
The invention aims to solve the problems of low inlet flue gas temperature, poor denitration effect, excessive pollutant emission and the like of a denitration device under the condition that a coal-fired power generating unit is shut down and does not shut down in the prior art, and provides a stable operation system of the denitration device in emergency operation of the coal-fired power generating unit when the coal-fired power generating unit is shut down and does not shut down.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the stable operation system of the denitration device for the emergency operation without stopping the furnace when the coal electric unit is stopped comprises the coal electric unit, wherein exhaust steam of a low-pressure cylinder of the coal electric unit enters a condenser for condensation, and condensed water sequentially passes through a condensed water pump, a low-pressure heater group, a deaerator, a water feed pump group, a No. 3 high-pressure heater, a No. 2 high-pressure heater and a No. 1 high-pressure heater; under the emergency operation condition of shutdown and no shutdown, heating steam sources of the No. 3 high-pressure heater, the No. 2 high-pressure heater and the No. 1 high-pressure heater are respectively from the reheat steam, the cold reheat steam main pipe and the main steam of the coal electric machine set, wherein the reheat steam is used for reducing pressure and temperature; a heating steam source of the deaerator is taken from a cold re-steam main pipe of the coal-fired generator set; one part of the water side outlet of the No. 1 high-pressure heater enters a boiler to complete steam-water thermodynamic cycle, and the other part of the water side outlet is used as desuperheating water to be mixed with depressurized main steam and reheated steam to be used as a heating steam source to be conveyed to the No. 1 high-pressure heater and the No. 3 high-pressure heater; a coal economizer is arranged in a boiler of the coal-electric unit, and flue gas at the outlet of the coal economizer enters a flue gas denitration device.
The invention further improves the following steps:
the coal electric machine set comprises a boiler, when the coal electric machine set normally operates, new steam of the boiler enters a high-pressure cylinder to do work, exhaust steam of the high-pressure cylinder enters a reheater of the boiler through a cold-steam main pipe to perform secondary temperature raising, reheated steam of the boiler enters an intermediate pressure cylinder to do work, and exhaust steam of the intermediate pressure cylinder enters a low-pressure cylinder to do work; the high-pressure heater group comprises a No. 1 high-pressure heater, a No. 2 high-pressure heater and a No. 3 high-pressure heater which are sequentially connected; the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are coaxially connected and jointly drag the generator to do work and generate power.
The new steam of the boiler is divided into three paths, wherein the first path is subjected to work from a high-pressure cylinder steam inlet valve group to a high-pressure cylinder, the second path is subjected to work from a first temperature and pressure reducing valve group to a cold re-steam main pipe, and the third path is subjected to work from a second temperature and pressure reducing valve group to a No. 1 high-pressure heater;
the reheated steam of the boiler is divided into three paths, the first path passes through an intermediate pressure cylinder steam inlet valve group to an intermediate pressure cylinder for acting, the second path passes through a third temperature and pressure reducing valve group to a No. 3 high-pressure heater, the third path passes through a sixth valve group to a steam side inlet of the flue gas heater, and a steam side outlet of the flue gas heater transmits the reheated steam after heat exchange to the heat supply network heater through a seventh valve group.
The heat source of the heat supply network heater is from partial exhaust steam of the intermediate pressure cylinder and partial reheat steam of the boiler; part of exhaust steam of the intermediate pressure cylinder is output to a steam side inlet of the heat supply network heater through a first valve group; part of reheated steam of the boiler exchanges heat with part of flue gas of the economizer in the flue gas heater, then is merged with part of exhaust steam from the intermediate pressure cylinder, is conveyed to a steam side inlet of the heating network heater, and exchanges heat with heat supply circulating water; and the drain water of the heat supply network heater is conveyed to a water side inlet of the deaerator.
The outlet feed water of the No. 1 high-pressure heater is divided into two paths, the first path enters the boiler, the second path enters the first temperature and pressure reducing valve group through the tenth valve group, the third path enters the second temperature and pressure reducing valve group, and the fourth path enters the third temperature and pressure reducing valve group.
The exhaust steam of the high-pressure cylinder is connected with a cold re-steam main pipe through a second valve group, and the cold re-steam main pipe conveys the exhaust steam of the high-pressure cylinder to a boiler reheater; the first section of extraction steam of the high-pressure cylinder is connected with a first section of extraction steam pipeline through a third valve group, and the first section of extraction steam pipeline conveys the first section of extraction steam to the steam side inlet of the No. 1 high-pressure heater; and the cold re-steam main pipe conveys part of steam to a steam side inlet of the No. 2 high-pressure heater through an eighth valve group, and conveys the part of the steam to a steam side inlet of the deaerator through a ninth valve group, and the ninth valve group performs pressure reduction adjustment.
The three-section steam extraction pipeline is used for conveying the three-section steam extraction to a steam side inlet of the No. 3 high-pressure heater; and the four-section steam extraction of the intermediate pressure cylinder is connected with a heating steam source inlet of the deaerator through a fifth valve group.
The drained water after heat exchange of the No. 1 high-pressure heater is output to the No. 2 high-pressure heater for heat exchange, the drained water after heat exchange is output to the No. 3 high-pressure heater for heat exchange, and the drained water after heat exchange is output to the deaerator.
And a heat supply network circulating water pump set is arranged on the heat supply network backwater main pipe at the inlet of the heat supply network heater.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a stable operation system of a denitration device for realizing shutdown and non-shutdown emergency operation of a coal-electric unit, which is characterized in that under a shutdown and non-shutdown operation mode of the unit, heating steam sources of a deaerator, a No. 3 high-pressure heater and a No. 1 high-pressure heater are arranged to increase the inlet temperature of a boiler, and simultaneously reheated steam is used for heating the inlet flue gas temperature of the denitration device to meet the temperature requirement of safe operation of the denitration system, and the reheated steam and the high-pressure heater jointly act to ensure the denitration effect of the flue gas of the boiler and the standard emission of pollutants under the shutdown and non-.
[ description of the 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 diagram of the system of the present invention;
wherein, 1-boiler, 2-high pressure cylinder, 3-medium pressure cylinder, 4-low pressure cylinder, 5-generator, 6-condenser, 7-condensate pump, 8-deaerator, 9-water feeding pump group, 10-3 high pressure heater, 11-2 high pressure heater, 12-1 high pressure heater, 13-heat network circulating water pump group, 13-heat network heater, 15-hydrophobic pump group, 16-flue gas heater, 17-denitration device, 18-high pressure cylinder steam inlet valve group, 19-medium pressure cylinder steam inlet valve group, 20-medium and low pressure communicating pipe heat supply butterfly valve, 21-first valve group, 22-second valve group, 23-third valve group, 24-fourth valve group, 25-fifth valve group, 26-first temperature and pressure reduction valve group, 27-a second temperature and pressure reducing valve group, 28-a third temperature and pressure reducing valve group, 29-a sixth valve group, 30-a seventh valve group, 31-an eighth valve group, 32-a ninth valve group, 33-a tenth valve group and 34-a low-pressure heater group.
[ detailed description ] embodiments
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 denitration device stable commissioning system for the shutdown and non-shutdown emergency operation of the coal electric unit comprises the coal electric unit, wherein exhaust steam of a low-pressure cylinder 4 of the coal electric unit enters a condenser 6 for condensation, and condensed water sequentially passes through a condensed water pump 7, a low-pressure heater group 34, a deaerator 8, a water feed pump group 9, a No. 3 high-pressure heater 10, a No. 2 high-pressure heater 11 and a No. 1 high-pressure heater 12. Under the emergency operation condition of shutdown and no shutdown, heating steam sources of a No. 3 high-pressure heater 10, a No. 2 high-pressure heater 11 and a No. 1 high-pressure heater 12 are respectively from the reheat steam, the cold reheat steam main pipe and the main steam of the coal-electric machine set, wherein the reheat steam is used for reducing pressure and temperature; the heating steam source of the deaerator 8 is taken from a cold re-steam main pipe of the coal-fired generator set;
one part of the water side outlet of the No. 1 high-pressure heater 12 enters the boiler 1 to complete steam-water thermodynamic cycle, and the other part of the water side outlet is used as desuperheating water to be mixed with depressurized main steam and reheated steam to be used as a heating steam source to be conveyed to the No. 1 high-pressure heater 12 and the No. 3 high-pressure heater 10; a coal economizer is arranged in a boiler 1 of the coal-electric unit, and flue gas at the outlet of the coal economizer enters a flue gas denitration device 17.
The coal electric unit comprises a boiler 1, wherein new steam of the boiler 1 enters a high-pressure cylinder 2 to do work, exhaust steam of the high-pressure cylinder 2 enters a reheater of the boiler 1 through a cold-steam main pipe to perform secondary temperature raising, reheated steam of the boiler 1 enters an intermediate pressure cylinder 3 to do work, and exhaust steam of the intermediate pressure cylinder 3 enters a low-pressure cylinder 4 to do work; the high-pressure heater group comprises a No. 1 high-pressure heater 12, a No. 2 high-pressure heater 11 and a No. 3 high-pressure heater 10 which are connected in sequence; the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 are coaxially connected and jointly drag the generator 5 to do work and generate electricity.
The outlet feed water of the No. 1 high-pressure heater 12 is divided into two paths, wherein the first path enters the boiler 1, the second path enters the first temperature and pressure reducing valve group 26 through the tenth valve group, the third path enters the second temperature and pressure reducing valve group 27, and the fourth path enters the third temperature and pressure reducing valve group 28. The exhaust steam of the high-pressure cylinder 2 is connected with a cold re-steam main pipe through a second valve group 22, and the cold re-steam main pipe conveys the exhaust steam of the high-pressure cylinder 2 to a reheater of the boiler 1; the first section of extraction steam of the high-pressure cylinder 2 is connected with a first section of extraction steam pipeline through a third valve group 23, and the first section of extraction steam pipeline conveys the first section of extraction steam to the steam side inlet of the No. 1 high-pressure heater 12; the cold re-steam main pipe conveys part of feed water to a steam side inlet of the No. 2 high-pressure heater 11 through an eighth valve group 31, and conveys the feed water to a steam side inlet of the deaerator 8 through a ninth valve group 32. Three-section steam extraction of the intermediate pressure cylinder 3 is connected with three-section steam extraction pipelines through a fourth valve group 24, and the three-section steam extraction pipelines convey the three-section steam extraction to a steam side inlet of the No. 3 high-pressure heater 10; and the four-section steam extraction of the intermediate pressure cylinder 3 is connected with the heating steam source inlet of the deaerator 8 through a fifth valve group. Steam after heat exchange by the No. 1 high-pressure heater 12 is drained to the No. 2 high-pressure heater 11 for heat exchange, steam after heat exchange is drained to the No. 3 high-pressure heater 10 for heat exchange, and drain after heat exchange is output to the deaerator 8.
The new steam of the boiler 1 is divided into three paths, the first path does work through a high-pressure cylinder steam inlet valve group 18 to a high-pressure cylinder 2, the second path flows through a first temperature and pressure reducing valve group 26 to a cold re-steam main pipe, and the third path flows through a second temperature and pressure reducing valve group 27 to a No. 1 high-pressure heater 12; the reheat steam of the boiler 1 is divided into three paths, the first path is transmitted to the intermediate pressure cylinder 3 through the intermediate pressure cylinder steam inlet valve group 19 to do work, the second path is transmitted to the No. 3 high-pressure heater 10 through the third temperature and pressure reducing valve group 28, the third path is transmitted to the steam side inlet of the flue gas heater 16 through the sixth valve group 29, and the steam side outlet of the flue gas heater 16 transmits the reheat steam after heat exchange to the heat supply network heater 14 through the seventh valve group 30.
The heat source of the heat network heater 14 is part of exhaust steam of the intermediate pressure cylinder 3 and part of reheat steam of the boiler 1; part of the exhaust steam of the intermediate pressure cylinder 3 is output to a steam side inlet of the heating network heater 14 through a first valve group 21; part of reheated steam of the boiler 1 exchanges heat with part of flue gas of the economizer in the flue gas heater 16, then is merged with part of exhausted steam from the intermediate pressure cylinder 3, is conveyed to a steam side inlet of the heating network heater 14, and exchanges heat with heat supply circulating water; the drain water of the heater grid 14 is delivered to the water side inlet of the deaerator 8. And a heat supply network circulating water pump set 13 is arranged on a heat supply network return water main pipe at the inlet of the heat supply network heater 14.
The principle of the invention is as follows:
in the heating season of residents, when the coal-electric unit normally operates, new steam at the outlet of the boiler 1 enters the high-pressure cylinder 2 to do work, then exhaust steam enters the reheater of the boiler 1 through the cold-steam main pipe to realize secondary temperature rise and avoid the overheating of the reheater, then enters the intermediate-pressure cylinder 3 to do work, the exhaust steam is divided into two paths, one path enters the heating network heater 14 to heat heating circulating water through the valve group 21 to the heating steam main pipe, and drain water enters the water side inlet of the deaerator 8 after being boosted by the drain pump group 15; the rest steam enters the low pressure cylinder 4 to continue acting, the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 are coaxially connected and jointly drag the generator 5 to do work and generate power, the low pressure cylinder 4 discharges steam to the condenser 6 for condensation, and condensed water sequentially flows through the condensed water pump 7, the low pressure heater group 34, the deaerator 8, the feed water pump group 9, the No. 3 high pressure heater 10, the No. 2 high pressure heater 11 and the No. 1 high pressure heater 12 to be heated and pressurized and then enters the boiler 1, so that the steam-water thermodynamic cycle is completed. At this time, the high-pressure cylinder intake valve group 18, the intermediate-pressure cylinder intake valve group 19, the intermediate-low pressure communicating pipe heat supply butterfly valve 20, the first valve group 21, the second valve group 22, the third valve group 23, the fourth valve group 24, the fifth valve group 25, and the eighth valve group 31 are opened, and the first temperature-reducing and pressure-reducing valve group 26, the second temperature-reducing and pressure-reducing valve group 27, the third temperature-reducing and pressure-reducing valve group 28, the sixth valve group 29, the seventh valve group 30, the ninth valve group 32, and the tenth valve group 33 are closed.
When one or both of the steam turbine and the generator are in failure, the unit still needs to supply heat to the outside in a centralized way, and the emergency operation mode without shutdown is called as the shutdown and blowing out mode: the steam turbine high-pressure cylinder steam inlet valve group 18, the medium-pressure cylinder steam inlet valve group 19 and the medium-low pressure communicating pipe heat supply butterfly valve 20 are closed, the first valve group 21, the second valve group 22, the third valve group 23, the fourth valve group 24 and the fifth valve group 25 are closed, and the first temperature and pressure reducing valve group 26, the second temperature and pressure reducing valve group 27, the third temperature and pressure reducing valve group 28, the sixth valve group 29, the seventh valve group 30, the ninth valve group 32 and the tenth valve group 33 are opened. And the high-pressure cylinder 2, the intermediate-pressure cylinder 3, the low-pressure cylinder 4, the generator 5, the condenser 6 and the condensate pump 7 are stopped.
The new steam at the outlet of the boiler 1 is divided into two paths: one way after second temperature and pressure reduction valve group 27 cooling decompression to one section steam extraction pipeline of steam turbine, third valve group 23 for 1 # high pressure feed water of high pressure feed water heater 12, the temperature reduction water is got from 1 # high pressure feed water heater group 12 export, another way is after first temperature and pressure reduction valve group 26 cooling decompression to cold steam female pipe again, second valve group 22, get into boiler 1 reheater secondary and carry out the temperature and avoid the reheater after overtemperature, divide into two the tunnel: one path of the steam is cooled and depressurized by a third temperature and pressure reducing valve group 28 and then is sent to a steam turbine three-section steam extraction pipeline and a fourth valve group 24 and is used for heating steam of a No. 3 high-pressure heater 10, temperature reducing water is taken from an outlet of a No. 1 high-pressure heater group 12 for supplying water, the other path of the steam enters a flue gas heater 16 through a sixth valve group 29 to heat part of flue gas at an outlet of an economizer of a boiler 1, the cooled steam enters a heat supply network heater 14 through a seventh valve group 30 to heat supply circulating water, and drained water is boosted by a drainage pump group 15 and then flows into a water side inlet. The steam and water thermal cycle is completed after the temperature and the pressure of the steam and water are raised by a deaerator 8, a feed pump set 9, a No. 3 high-pressure heater 10, a No. 2 high-pressure heater 11 and a No. 1 high-pressure heater 12 and then the steam and water enter a boiler 1.
Deaerator 8 and No. 2 high pressure feed water heater 11 heating steam source are got from the female pipe of cold steam again, eighth valve group 31 and ninth valve group 32 are opened, No. 3 high pressure feed water heater 10 heating steam source is got from the hot steam of step-down cooling, No. 1 high pressure feed water heater 12 heating steam source is got from the main steam of step-down cooling, second step-down temperature and pressure reduction valve group 27 and third step-down temperature and pressure reduction valve group 28 are opened, the step-down temperature water is got from No. 1 high pressure feed water heater 12 export, in order to guarantee that the steam temperature who gets into steam conduit and heater is at the design range, thereby avoid influencing equipment and pipeline safety because of the overtemperature. The flue gas at the outlet of the economizer of the boiler 1 is divided into two paths, one path enters a flue gas heater 16 for heating, then is converged with the other path and then enters a flue gas denitration device 17. The invention ensures that the high-pressure heater group (No. 1-No. 3) is normally put into operation to improve the temperature of the feed water entering the boiler 1 by reasonably arranging the steam source, and simultaneously utilizes the high superheat degree of high-temperature steam to heat the temperature of the flue gas at the inlet of the denitration device 16, and the high superheat degree of the high-temperature steam and the flue gas can jointly act to ensure that the denitration effect of the flue gas of the boiler and the pollutant emission reach the standard under the condition of.
The main steam operation pressure of the boiler 1 is between the constant pressure operation working condition and the sliding pressure operation working condition, the initial steam pressure at the boiler side is completely provided by the water supply pump set 9 at the moment, the pressure of the steam at the outlet of the high-temperature superheater reaches the required inlet pressure of the reheater after passing through the temperature and pressure reduction device, and the heat re-steam at the outlet directly supplies heat to the outside after being subjected to temperature and pressure reduction. The invention provides a method for adjusting steam pressure of an inlet of a reheater (consistent with a two-stage steam extraction steam source), a first-stage steam extraction, a three-stage steam extraction and an inlet of a deaerator.
The regenerative steam extraction of the coal-fired generator set is a self-balancing regulation mode, the boiler evaporation capacity is used as a dependent variable under the operation condition of shutdown and non-boiler shutdown, and a relation curve of the first-stage and second-stage steam extraction pressure of the steam turbine and the boiler evaporation capacity under the pure condensing operation condition is used as a basis; the three-stage and four-stage steam extraction uses the steam inlet flow of the intermediate pressure cylinder as a dependent variable, and adopts the relation curve of the steam extraction pressure of the three-stage and four-stage steam extraction of the steam turbine and the evaporation capacity of the boiler under the pure condensing operation condition as a basis to adjust the steam inlet pressure of the deaerator 8 and the high-pressure heater group (No. 1-No. 3) under the condition of stopping the steam turbine without stopping the steam turbine. The 1-4-level steam extraction pressure control correlation formula of the 300 MW-level cogeneration unit without shutdown is as follows:
P1＝0.005711×Qms+0.181253
P2＝0.00346×Qms+0.10007
P3＝0.00209×Qrh+0.00034
P4＝0.8±0.05MPa
T1＝380±10℃
T2＝320±10℃
T3＝445±10℃
T4＝f(P4,H(P2,T2))
wherein, T4The isenthalpic temperature after decompression of the cold re-steam. Qms、QrhThe evaporation capacity of the boiler and the steam flow at the outlet of a reheater of the boiler are respectively t/h; p1～P4The steam inlet pressure of a No. 1-3 high-pressure heater and a deaerator is MPa; t is1～T4The inlet steam temperatures of the No. 1-3 high-pressure heater and the deaerator are respectively DEG C.
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 (9)
1. The stable operation system of the denitration device is characterized by comprising a coal electric unit, wherein exhaust steam of a low-pressure cylinder (4) of the coal electric unit enters a condenser (6) for condensation, and condensed water sequentially passes through a condensate pump (7), a low-pressure heater group (34), a deaerator (8), a water feed pump group (9), a No. 3 high-pressure heater (10), a No. 2 high-pressure heater (11) and a No. 1 high-pressure heater (12); under the emergency operation condition of shutdown without blowing out, heating steam sources of a No. 3 high-pressure heater (10), a No. 2 high-pressure heater (11) and a No. 1 high-pressure heater (12) are respectively from pressure-reduced and temperature-reduced reheat steam, a cold reheat steam main pipe and pressure-reduced and temperature-reduced main steam of a coal electric unit; the heating steam source of the deaerator (8) is taken from a cold re-steam main pipe of the coal-fired generator set; one part of the water side outlet of the No. 1 high-pressure heater (12) enters a boiler (1) to complete steam-water thermodynamic cycle, and the other part of the water side outlet is used as desuperheating water to be mixed with main steam and reheated steam which are depressurized and used as heating steam sources to be conveyed to the No. 1 high-pressure heater (12) and the No. 3 high-pressure heater (10); a coal economizer is arranged in a boiler (1) of the coal-electric unit, and flue gas at the outlet of the coal economizer enters a flue gas denitration device (17).
2. The stable denitration device commissioning system of the coal electric unit during the shutdown and non-shutdown emergency operation according to claim 1 is characterized by comprising a boiler (1), wherein when the coal electric unit normally operates, new steam of the boiler (1) enters a high-pressure cylinder (2) to do work, exhaust steam of the high-pressure cylinder (2) enters a reheater of the boiler (1) through a cold re-steam main pipe to perform secondary temperature raising, reheated steam of the boiler (1) enters an intermediate-pressure cylinder (3) to do work, and exhaust steam of the intermediate-pressure cylinder (3) enters a low-pressure cylinder (4) to do work; the high-pressure heater group comprises a No. 1 high-pressure heater (12), a No. 2 high-pressure heater (11) and a No. 3 high-pressure heater (10) which are connected in sequence; the high pressure cylinder (2), the middle pressure cylinder (3) and the low pressure cylinder (4) are coaxially connected and jointly drag the generator (5) to do work and generate electricity.
3. The stable denitration device commissioning system for emergency operation without shutdown of coal-electric machine set according to claim 2, wherein the new steam of the boiler (1) is divided into three paths, the first path performs work through the high-pressure cylinder steam inlet valve group (18) to the high-pressure cylinder (2), the second path passes through the first temperature and pressure reducing valve group (26) to the cold re-steam main pipe, and the third path passes through the second temperature and pressure reducing valve group (27) to the high-pressure heater (12) No. 1;
the reheated steam of the boiler (1) is divided into three paths, the first path enters a steam valve group (19) of the intermediate pressure cylinder to work in the intermediate pressure cylinder (3), the second path passes through a third temperature and pressure reducing valve group (28) to a No. 3 high-pressure heater (10), the third path passes through a sixth valve group (29) to a steam side inlet of the flue gas heater (16), and a steam side outlet of the flue gas heater (16) transmits the reheated steam after heat exchange to the heat supply network heater (14) through a seventh valve group (30).
4. The denitration device stable commissioning system for emergency operation without shutdown of coal electric unit as claimed in claim 3, wherein the heat source of said heat network heater (14) is from part of the exhaust steam of the intermediate pressure cylinder (3) and part of the reheat steam of the boiler (1); part of exhaust steam of the intermediate pressure cylinder (3) is output to a steam side inlet of the heat supply network heater (14) through a first valve group (21); part of reheated steam of the boiler (1) exchanges heat with part of flue gas of the economizer in the flue gas heater (16), then is merged with part of exhaust steam from the intermediate pressure cylinder (3), is conveyed to a steam side inlet of the heat supply network heater (14), and exchanges heat with heat supply circulating water; the drainage of the heating network heater (14) is conveyed to the water side inlet of the deaerator (8).
5. The stable operation system of the denitration device for the emergency operation without shutdown of the coal-electric machine set according to claim 4, wherein the outlet water supply of the No. 1 high-pressure heater (12) is divided into two paths, the first path enters the boiler (1), the second path enters the first temperature and pressure reducing valve group (26), the third path enters the second temperature and pressure reducing valve group (27), and the fourth path enters the third temperature and pressure reducing valve group (28) through the tenth valve group (33).
6. The stable denitration device commissioning system for emergency operation without shutdown of coal-electric machine set as claimed in claim 4, wherein the exhaust steam of said high-pressure cylinder (2) is connected to a cold re-steam main pipe through a second valve set (22), and the cold re-steam main pipe transports the exhaust steam of the high-pressure cylinder (2) to a reheater of the boiler (1); one section of extracted steam of the high-pressure cylinder (2) is connected with one section of extracted steam pipeline through a third valve group (23), and the one section of extracted steam pipeline conveys the one section of extracted steam to a steam side inlet of the No. 1 high-pressure heater (12); and the cold re-steam main pipe conveys part of steam to a steam side inlet of a No. 2 high-pressure heater (11) through an eighth valve group (31), and conveys the part of steam to a steam side inlet of a deaerator (8) through a ninth valve group (32), and the ninth valve group (32) performs pressure reduction adjustment.
7. The stable denitration device commissioning system for emergency operation without shutdown of coal-electric machine set according to claim 6, wherein a three-stage steam extraction pipe of the intermediate pressure cylinder (3) is connected with a three-stage steam extraction pipeline through a fourth valve set (24), and the three-stage steam extraction pipeline conveys the three-stage steam extraction to a steam side inlet of a No. 3 high pressure heater (10); and the four-section steam extraction of the intermediate pressure cylinder (3) is connected with the heating steam source inlet of the deaerator (8) through a fifth valve group.
8. The stable denitration device commissioning system for the shutdown and non-shutdown emergency operation of the coal-electric unit according to any one of claims 2 to 7 is characterized in that the drained water subjected to heat exchange by the No. 1 high-pressure heater (12) is output to the No. 2 high-pressure heater (11) for heat exchange, the drained water subjected to heat exchange is output to the No. 3 high-pressure heater (10) for heat exchange, and the drained water subjected to heat exchange is output to the deaerator (8).
9. The stable denitration device commissioning system for emergency operation without shutdown of coal-electric unit as set forth in any one of claims 3 to 7 is characterized in that a heat supply network circulating water pump set (13) is arranged on a heat supply network return water main pipe at an inlet of a heat supply network heater (14).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114607477A (en) * | 2022-04-01 | 2022-06-10 | 邹平滨能能源科技有限公司 | Rapid cooling method for steam turbine of unit system unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607477A (en) * | 2022-04-01 | 2022-06-10 | 邹平滨能能源科技有限公司 | Rapid cooling method for steam turbine of unit system unit |
| CN114607477B (en) * | 2022-04-01 | 2023-08-01 | 邹平滨能能源科技有限公司 | Rapid cooling method for unit turbine |
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