CN203744223U - Critical unit heating system - Google Patents

Critical unit heating system Download PDF

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Publication number
CN203744223U
CN203744223U CN201420137842.7U CN201420137842U CN203744223U CN 203744223 U CN203744223 U CN 203744223U CN 201420137842 U CN201420137842 U CN 201420137842U CN 203744223 U CN203744223 U CN 203744223U
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CN
China
Prior art keywords
water
boiler
pipeline
heating
eliminating
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Expired - Fee Related
Application number
CN201420137842.7U
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Chinese (zh)
Inventor
孟祥东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Winding Power Generation Corp Ltd Of Tianjin Datang
Datang International Power Generation Co Ltd
Tianjin Datang International Panshan Power Generation Co Ltd
Original Assignee
International Winding Power Generation Corp Ltd Of Tianjin Datang
Datang International Power Generation Co Ltd
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Application filed by International Winding Power Generation Corp Ltd Of Tianjin Datang, Datang International Power Generation Co Ltd filed Critical International Winding Power Generation Corp Ltd Of Tianjin Datang
Priority to CN201420137842.7U priority Critical patent/CN203744223U/en
Application granted granted Critical
Publication of CN203744223U publication Critical patent/CN203744223U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a critical unit heating system which comprises a water wall, a furnace water circulating pump, a deaerator and a steam pocket. The furnace water circulating pump is arranged in a descending pipeline of the steam pocket, water of the deaerator flows through a coal economizer to the steam pocket, the front wall of the boiler water wall is provided with a water drainage pipeline which is connected to a water feeding pipeline of the deaerator through a connecting pipeline, and critical unit auxiliary steam is led into a steam communicating pipe of the deaerator. According to the critical unit heating system, the critical unit auxiliary steam is utilized for preheating a boiler water system before ignition of a boiler, reliability and stability of plasma ignition are improved, the pulverized coal burning rate of plasma ignition is greatly improved, combustion is more sufficient, pollution of smoke generated by combustion to the atmospheric environment is reduced, and meanwhile the boiler starting speed is improved.

Description

One is heating system as the occasion requires
Technical field
The utility model relates to steam power plant field, particularly, relates to one heating system as the occasion requires.
Background technology
Thermal power generation is the main generation mode of China, and station boiler, as one of three large main process equipments of firepower power station, is accompanied by the development of China's Thermal Power Generation Industry.
Boiler is a kind of energy conversion, and groundwork principle is to utilize the waste heat in heat energy or the industrial production discharging after fuel combustion to pass to the water in container, makes water reach needed temperature or certain pressure steam.Boiler carries out at " pot " and " stove " two parts simultaneously, and after water enters boiler, in boiler circuit, boiler heating surface, by the heat transmission feedwater absorbing, makes water be heated into hot water or the generating steam of uniform temperature and pressure, is drawn application.In combustion apparatus part, heat is constantly emitted in fuel combustion, and the high-temperature flue gas that burning produces, by hot propagation, transfer heat to boiler heating surface, and self-temperature reduces gradually, is finally discharged by chimney.
As time goes on, environmental protection and energy saving become the important directions of China Power industrial restructuring, Thermal Power Generation Industry is actively pushed forward the upgrading and optimization of industrial structure under the policy guidance of " upper large pressure is little ", close the little fired power generating unit that large quantities of efficiencies are low, pollution is heavy, accelerated to a great extent the update of domestic thermal power generating equipment.
And existing boiler all can cause certain pollution to environment, one of them topmost factor is exactly: fuel combustion is insufficient, and especially the ignition of the boiler burning initial stage, because furnace chamber is colder, fuel combustion is abundant not, and the harm bringing therefrom mainly contains:
First, increased financial cost: fuel combustion is insufficient, increased ignition of the boiler to the grid-connected time, waste fuel consumption.
Secondly, reduced security performance: because fuel combustion is insufficient, greatly increased the coal dust deposition in boiler back end ductwork HeSCR district, very easily produced back-end ductwork and fire again.
Finally, reduce the stability of environmental protection equipment: because fuel combustion is insufficient, increased the deposition of coal dust in denitrating catalyst and desulfurizing tower, caused and start rear environmental protection Efficiency Decreasing.
Therefore the burn-off rate that, how to improve fuel becomes very important.
Utility model content
In order to address the above problem, the utility model provides one heating system as the occasion requires, particularly, adopts following technical scheme:
One is heating system as the occasion requires, comprise burner hearth, oxygen-eliminating device and drum, the water out of described oxygen-eliminating device is connected to drum, it is characterized in that, the front wall of described burner hearth arranges the boiler front wall pipeline that discharges water, the boiler front wall pipeline that discharges water is connected to the watering pipeline of oxygen-eliminating device by connecting line, the vapor communication pipe of oxygen-eliminating device passes into auxiliary vapour as the occasion requires.
Further, in the decline pipeline of drum, boiler water circulating pump is set.
Further, on described connecting line, stop valve is set.
Further, the described boiler front wall pipeline that discharges water connects and surely arranges flash vessel, the discharge water junction of pipeline and surely arrange boiler front wall between flash vessel and discharge water on pipeline stop valve is set of described connecting line and boiler front wall.
Further, the boiler front wall before described connecting line junction discharges water on pipeline electric check valve and hand stop valve is set.
Further, described oxygen-eliminating device connects low-pressure heater, and low-pressure heater is arranged between connecting line and oxygen-eliminating device; Described oxygen-eliminating device connects deoxygenation water tank.
Further, described deoxygenation water tank connects respectively a high-pressure heater, No. two high-pressure heaters and No. three high-pressure heaters.
Further, a described high-pressure heater, No. two high-pressure heaters and No. three high-pressure heaters are all connected to economizer, and economizer connects drum.
Further, the rear wall of described described burner hearth arranges after boiler the wall pipeline that discharges water, and after boiler, the wall pipeline that discharges water connects and surely arranges flash vessel.
Further, after described boiler, wall discharges water on pipeline hand stop valve and electric check valve is set.
Technical scheme before the utility model has adopted and has been different from, before ignition of the boiler, burner hearth is carried out to preheating as the occasion requires by utilizing, the reliability and stability of plasma ignition are improved, greatly improve plasma ignition coal dust burn-off rate, make its burning more abundant, the pollution that the flue dust that having reduced burns produces causes atmospheric environment.
The water circulation system that the utility model is set up: newly-increased the boiler front wall pipeline that discharges water is connected to the connecting line on oxygen-eliminating device watering pipeline, rely on static pressure in boiler that stove water is guided to oxygen-eliminating device by correct control associated pipe valve state, water in deoxygenation water tank relies on 1 vapour front pump through supply line blowback boiler-steam dome again, so water in boiler water wall is set up to water circulation repeatedly, for continuous heating provides possibility.
The utility model adopts provides lasting thermal source as the occasion requires: after water circulation is set up, utilize auxiliary vapour as the occasion requires to carry out vapour, drop into oxygen-eliminating device heating, continue to strengthen by boiler front wall water, slowly promote water temperature in whole burner hearth, thereby promote gradually temperature in burner hearth.
The utility model ensures stove water forced circulation: heat up for ensureing the each water-cooling wall pipeline of boiler thermally equivalent and accelerating boiler tube wall, after dropping into heating system, start boiler water circulating pump, accelerate high and low temperature hydrothermal exchange in water-cooling wall, avoid the nonuniform heating excessive thermal stress of local generation and thermal deformation.
Owing to having adopted above-mentioned technical scheme, make the utility model effectively solve the colder technical problem of existing ignition of the boiler front furnace, make the utlity model has following advantage:
1, improve economy: heating before igniting, improve plasma ignition reliability and stability, improve plasma ignition coal dust burn-off rate, can greatly shorten ignition of the boiler simultaneously to the grid-connected time, save fuel consumption.
2, improve security: after plasma ignition coal dust burn-off rate improves, greatly reduce the coal dust deposition in boiler back end ductwork HeSCR district, prevent that back-end ductwork from occurring to burn again.
3, increase environmental protection equipment stability: plasma ignition coal dust burn-off rate reduces the deposition of coal dust in denitrating catalyst and desulfurizing tower after improving greatly, after preventing from starting, cause environmental protection Efficiency Decreasing.
Brief description of the drawings
Fig. 1 system diagram of the present utility model.
Attached number in the figure explanation: after 1-burner hearth 2-boiler water circulating pump 3-boiler, the wall pipeline 4-boiler front wall pipeline 5-that discharges water that discharges water surely arranges flash vessel 6-connecting line 7-and determine blowoff basin 8-first high-pressure heater 9-the second high-pressure heater 10-third high pressure heater 11-economizer 12-oxygen-eliminating device 13-deoxygenation water tank 14-low-pressure heater 15-drum.
Detailed description of the invention
As shown in Figure 1, one of the present utility model heating system as the occasion requires, comprise burner hearth 1, oxygen-eliminating device 12 and drum 15, the water out of described oxygen-eliminating device 12 is connected to drum 15, it is characterized in that, the front wall of described burner hearth 1 arranges the boiler front wall pipeline 4 that discharges water, and the boiler front wall pipeline 4 that discharges water is connected to the watering pipeline of oxygen-eliminating device 12 by connecting line 6, and the vapor communication pipe of oxygen-eliminating device 12 passes into auxiliary vapour as the occasion requires.
In order to ensure water circulation of the present utility model, in the decline pipeline of drum 15 of the present utility model, boiler water circulating pump 2 is set, provide Water circulation hydrodynamics by boiler water circulating pump 2.
The utility model is transformed on the connecting line of existing boiler: first, discharge water pipeline 4 of boiler front wall is coupled together by a connecting line 6 with oxygen-eliminating device 12, set up the water circulation of a boiler; Secondly, the boiler water circulating pump 2 arranging in the decline pipeline by former drum 15, for water circulation provides power, makes water circulation can force to carry out; Finally, after water circulation is set up, utilize auxiliary vapour as the occasion requires to carry out vapour, drop into oxygen-eliminating device 12 and heat, continue to strengthen by front wall water, slowly promote water temperature in whole water-cooling wall, thereby promote gradually temperature in burner hearth.
System of the present utility model is in the time coming into operation, must ensure the stable level of oxygen-eliminating device 12, drum 15, therefore flow-control is answered to SC, special care should be used to is by economizer entrance feed water total gate control oxygen-eliminating device and steam water-level balance, prevents from that deaerator level is too high to cause flow spill valve action.Therefore, the utility model is provided with corresponding valve flow is controlled.
First, in order to realize the control to flow in connecting line 6, on described connecting line 6, stop valve is set, preferably adopts hand stop valve.
Secondly, the boiler front wall of the present utility model pipeline 4 that discharges water connects and surely arranges flash vessel 5, discharge water and flow into the flow-control of surely arranging in flash vessel 5 in pipeline 4 in order to realize boiler front wall, the discharge water junction of pipeline 4 and surely arrange boiler front wall between flash vessel 5 and discharge water on pipeline 4 stop valve is set of described connecting line 6 and boiler front wall, preferably adopts hand stop valve.
Finally, in order to realize the total flow control that boiler front wall is discharged water in pipeline 4, the boiler front wall before described connecting line 6 junctions discharges water on pipeline 4 electric check valve and hand stop valve is set.
Retain on original pipeline and equipment on valve constant, realize the monitoring to flow in water cycle process.
Oxygen-eliminating device 12 of the present utility model connects low-pressure heater 14, and low-pressure heater 14 is arranged between connecting line 6 and oxygen-eliminating device 12.
The effect of low-pressure heater is to utilize the steam that did part merit in steam turbine, is evacuated to heated feed water in heater, improves the temperature of water, has reduced steam turbine and has been discharged into the quantity of steam in condenser, has reduced energy loss, has improved the cycle efficieny of therrmodynamic system.Structure is more employing uprise baffle heater.The heating surface of heater is generally that the straight tube bundle or the U-shaped tube bank that form with brass tube or seamless steel pipe form.Heated water enters separated hydroecium one side from top water inlet pipe, flow in U-shaped tube bank, U-shaped pipe, at the vapor space of heater, absorbs the heat of heating steam again, pass to mobile water in pipe by tube wall, heated water flows out through heater outlet hydroecium.
Oxygen-eliminating device 12 of the present utility model connects deoxygenation water tank 13.Be in deoxygenation water tank except the feedwater of peroxide is pooled to oxygen-eliminating device bottom container, the in-built powerful heat exchange boiling device again that has up-to-date science design of deoxygenation water tank, this device has powerful heat exchange, promote rapidly water temperature, more deep deoxygenization, reduces water tank vibration, reduces the advantages such as accent, improve the service life of equipment, ensured the security reliability of equipment operation.
Deoxygenation water tank 13 connects respectively high-pressure heater 8, No. two high-pressure heaters 9 and No. three high-pressure heaters 10.
High-pressure heater is to utilize the part of the steam turbine device that feedwater is heated of bleeding.This device is made up of housing and piping two large divisions, on housing inner chamber top, steam condensation section is set, and bottom arranges hydrophobic cooling section, inlet tube and outlet tube top arrange feed-water inlet and give water out.After superheated steam enters housing by import, the feedwater in main top screwed pipe can be heated, after steam condensation is water, the hot water condensing can be dredged bottom again the part feedwater heating in cold screwed pipe, and the condensate water after being utilized flows out external through hydrophobic outlet.It is low that this device has energy consumption, compact conformation, and area occupied is few, consumes the remarkable advantage such as material province, and can more strictly control hydrophobic water level, hydrophobic flow velocity and dwindle drain approach.
High-pressure heater 8, No. two high-pressure heaters 9 and No. three high-pressure heaters 10 are all connected to economizer 11, and economizer 11 connects drum 15.
The rear wall of burner hearth 1 of the present utility model arranges after boiler the wall pipeline 3 that discharges water, and after boiler, the wall pipeline 3 that discharges water connects and surely arranges flash vessel 5.After described boiler, wall discharges water on pipeline 3 hand stop valve and electric check valve is set.
The blow-off line of low-pressure heater 14 of the present utility model is connected to determines blowoff basin 7, on its blow-off line, hand stop valve is set.
The method that the utility model starts:
(1) confirm that oxygen-eliminating device 12 water quality are qualified, dropped into heating system, carefully check each valve state by check criteria before boiler water filling, the water filling of confirmation stove water pump is complete, start a vapour front pump by water on boiler-steam dome 15 to high water level.
(2) after boiler filling up water, crawl boiler water circulating pump 2 carries out exhaust, and boiler water circulating pump 2 makes stove water circulation.
(3) confirm that pusher side low-pressure heater 14 exports Electrically operated gate and opens, low-pressure heater 14 entrance doors are closed, low-pressure heater 14 discharge water Electrically operated gate and manually operated door standard-sized sheet, each condensing water conduit wicket Close All, high-pressure heater is hydrophobic closes to fixed row's door, and cigarette cooler discharges water to and determines row's manually operated door and close; Confirm that furnace side low-pressure heater 14 blow-off lines close to determining blowoff basin manually operated door, the front wall pipeline 4 that discharges water is closed to low-pressure heater 14 blow-off line communicating doors, and the front wall pipeline 4 that discharges water is closed to surely arranging flash vessel 5 manually operated doors.
(4) slow discharge water Electrically operated gate, manually operated door of standard-sized sheet boiler front wall, open gradually the large front wall low-pressure heater 14 blow-off line communicating doors that discharge water, confirm oxygen-eliminating device 12 water level risings, improve gradually fore pump by control economizer 11 entrance Electrically operated gate and exert oneself, control oxygen-eliminating device 12 water levels and drum 15 stable levels.
(5) after water circulation is set up, improve water circulation flow as far as possible, open gradually the auxiliary vapour evaporation capacity for engine of large oxygen-eliminating device 12, slowly control stove coolant-temperature gage and rise gradually, improve gradually stove coolant-temperature gage to 120 DEG C left and right.Require during this time to control drum 15 water levels, oxygen-eliminating device 12 water levels are normal, and oxygen-eliminating device 12 water levels when low, start boiler water filling pump and maintain.
Requirement of the present utility model:
(1), before boiler is not lighted a fire, require boiler to forbid ventilating.After fire box temperature reaches requirement, should confirm that steam air heater heating coil is abundant, plasma ignition system is made adequate preparation, and restarts and send air-introduced machine, and require to complete as early as possible plasma ignition, prevents that burner hearth quenching from producing excessive stresses.
(2) on drum, after water, must guarantee stove water water quality qualified (finally putting water one time), prevent that the excessively dirty oxygen-eliminating device shower nozzle that causes of water quality from stopping up.
(3) while heating as the occasion requires, notice monitoring that deaerator level and water temperature change, prevent oxygen-eliminating device superpressure, in service should be able to the closing tight of valve of employing.
(4) exit as the occasion requires after heating system, must guarantee that front wall discharges water to determining discharge casing and determining the manually operated door standard-sized sheet of blowoff basin, prevent unit starting after front wall wicket sternly do not cause the pressure damage equipment of spraining.
Certain power plant adopts after the technical solution of the utility model, has following technique effect:
(1) heating system 13:47 on November 24 puts into operation, and it is out of service that 0:37 on the 25th divides, and amounts to and drops into 11 hours, the wherein general 180-190 ton of whole system quantity of circulating water/hour, stove coolant-temperature gage rises 36 DEG C, and economizer exit cigarette temperature rises 47 DEG C, 3 DEG C of average stove per hour liters waterborne.(this time test air and flue system ventilation has 700 cubes of ms/h of left and right) as out of service in air and flue system, by this speed, as stove coolant-temperature gage, raising is brought up to 150 DEG C by 20 DEG C, estimates to need 12 hours.
(2) this fire box temperature is brought up to after 60 DEG C by 20 DEG C, carrying out plasma ignition catches fire stable, plasma burn-off rate improves greatly, not only greatly shortens starting fluid consumption and start-up time, also alleviation back-end ductwork coal dust deposition and desulfurizing tower, SCR district coal dust deposition has been played to anticipation effect.
The above is only preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction, although the utility model discloses as above with preferred embodiment, but not in order to limit the utility model, any technical staff who is familiar with this patent is not departing within the scope of technical solutions of the utility model, when can utilizing the technology contents of above-mentioned prompting to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solutions of the utility model, any simple modification of above embodiment being done according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of the utility model scheme.

Claims (10)

1. a heating system as the occasion requires, comprise burner hearth (1), oxygen-eliminating device (12) and drum (15), the water out of described oxygen-eliminating device (12) is connected to drum (15), it is characterized in that, the front wall of described burner hearth (1) arranges the boiler front wall pipeline (4) that discharges water, the boiler front wall pipeline (4) that discharges water is connected to the watering pipeline of oxygen-eliminating device (12) by connecting line (6), the vapor communication pipe of oxygen-eliminating device (12) passes into auxiliary vapour as the occasion requires.
2. one according to claim 1 heating system as the occasion requires, is characterized in that, boiler water circulating pump (2) is set in the decline pipeline of drum (15).
3. one according to claim 1 heating system as the occasion requires, is characterized in that, described connecting line arranges stop valve on (6).
4. one according to claim 1 heating system as the occasion requires, it is characterized in that, the described boiler front wall pipeline (4) that discharges water connects and surely arranges flash vessel (5), described connecting line (6) and boiler front wall discharge water pipeline (4) junction and surely arrange boiler front wall between flash vessel (5) and discharge water on pipeline (4) stop valve is set.
5. one according to claim 4 heating system as the occasion requires, is characterized in that, the boiler front wall before described connecting line (6) junction discharges water on pipeline (4) electric check valve and hand stop valve are set.
6. one according to claim 1 heating system as the occasion requires, is characterized in that, described oxygen-eliminating device (12) connects low-pressure heater (14), and low-pressure heater (14) is arranged between connecting line (6) and oxygen-eliminating device (12); Described oxygen-eliminating device (12) connects deoxygenation water tank (13).
7. one according to claim 6 heating system as the occasion requires, is characterized in that, described deoxygenation water tank (13) connects respectively a high-pressure heater (8), No. two high-pressure heaters (9) and No. three high-pressure heaters (10).
8. one according to claim 7 heating system as the occasion requires, it is characterized in that, described a high-pressure heater (8), No. two high-pressure heaters (9) and No. three high-pressure heaters (10) are all connected to economizer (11), and economizer (11) connects drum (15).
9. one according to claim 1 heating system as the occasion requires, is characterized in that, the rear wall of described described burner hearth (1) arranges after boiler the wall pipeline (3) that discharges water, and after boiler, the wall pipeline (3) that discharges water connects and surely arranges flash vessel (5).
10. one according to claim 9 heating system as the occasion requires, is characterized in that, after described boiler, wall discharges water on pipeline (3) hand stop valve and electric check valve are set.
CN201420137842.7U 2014-03-25 2014-03-25 Critical unit heating system Expired - Fee Related CN203744223U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420137842.7U CN203744223U (en) 2014-03-25 2014-03-25 Critical unit heating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420137842.7U CN203744223U (en) 2014-03-25 2014-03-25 Critical unit heating system

Publications (1)

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CN203744223U true CN203744223U (en) 2014-07-30

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CN201420137842.7U Expired - Fee Related CN203744223U (en) 2014-03-25 2014-03-25 Critical unit heating system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105627292A (en) * 2016-03-14 2016-06-01 国电长源汉川第一发电有限公司 Boiler circulating heating system and method for boiler water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105627292A (en) * 2016-03-14 2016-06-01 国电长源汉川第一发电有限公司 Boiler circulating heating system and method for boiler water
CN105627292B (en) * 2016-03-14 2018-05-01 国电长源汉川第一发电有限公司 A kind of stove water stove machine loop heating system and its heating means

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140730

Termination date: 20200325