CN207162509U - Improve SCR temperature of reactor system and devices - Google Patents

Improve SCR temperature of reactor system and devices Download PDF

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Publication number
CN207162509U
CN207162509U CN201621314287.6U CN201621314287U CN207162509U CN 207162509 U CN207162509 U CN 207162509U CN 201621314287 U CN201621314287 U CN 201621314287U CN 207162509 U CN207162509 U CN 207162509U
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China
Prior art keywords
boiler
temperature
scr
connection
arm
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Expired - Fee Related
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CN201621314287.6U
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Chinese (zh)
Inventor
吴景兴
马金凤
高玉新
王文生
袁德权
蒋翀
谭袖
李彦龙
孙伟
宋阳
张海楠
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Abstract

One kind improves SCR temperature of reactor system and devices, including boiler reversal chamber and economizer, it is characterised in that:Two bypass ducts are accessed at boiler reversal chamber to the SCR reactor inlet flues of economizer exit.The system is extracted the moderate oven cigarette close to 510 DEG C ~ 550 DEG C at boiler reversal chamber, is divided into 2 bypass ducts, SCR reactor inlet flue of the connection into economizer exit using the pressure difference formed between boiler difference heating surface when running.The exhaust gas volumn of extraction is no more than 10% of total exhaust gas volumn under the load, and extraction amount is relatively adapted to, and boiler feedwater and main reheat steam temperature is influenceed little.

Description

Improve SCR temperature of reactor system and devices
Technical field
It the utility model is related to a kind of raising SCR temperature of reactor system and device and method.
Background technology
European countries are relatively advanced in thermoelectricity flexibility technology, and Denmark's fired power generating unit is substantially cogeneration units, Winter heat supply phase minimum load can be with as little as 40% with as little as 15%-20%, German cogeneration units;German pure condensate is coal-fired Machine set technology is contributed can be with as little as 25%.
Nationwide generator installation and generated energy statistics is understood within 2015, combustion engine installation in 2015 only 4.4%, generating ratio Example 3%, similar with wind-powered electricity generation 3.3%, water-storage installation accounts for 1.5%, generated energy 0.3%, with wind-powered electricity generation not in an order of magnitude, And the construction period is grown.Chemical accumulation of energy does not have large scale business also.The energy resource structure in China is still based on thermoelectricity.
By the statistics in the end of the year 2014, the coal unit of 300,000 multikilowatts has 880, and 600,000 multikilowatts have 481, and both fill Machine is about 700,000,000 kilowatts, is main force's unit of coal electricity flexibility transformation.
With the adjustment of China's energy policy, fuel gas generation, water-storage, the present situation ratio of other novel energy-storings are total not More than 5%, and larger change being hardly resulted within the following regular period, the coal as " three Norths " regional main force's power supply is electric, It will be played a significant role after flexibility transformation in the lifting of power system peak modulation capacity, the time that fired power generating unit participates in peak regulation is more next More, large-sized station boiler often participates in peak regulation, and run turns into a kind of normality at low load.
In order to reduce NOx emission, boiler improvement is low NO+SCR, using hydrolysis of urea Ammonia Process.With catching fire Group of motors participate in peak regulation time it is more and more, boiler is run at low load for a long time, often 35%THA~40%THA it Between, SCR reactor inlet cigarettes temperature is less than 300 DEG C, not only wastes a large amount of ammonia at this temperature and has a strong impact on out of stock efficiency, NOx emission It is worth exceeded, discharge value is up to 400mg/Nm3More than, environmental requirement can not be met.Even it is forced to receive fine, to enterprise, society Cause economic loss and social influence.Therefore, it is relatively low as urgently how to solve out of stock device portal flue-gas temperature under underload The problem of solution.
Utility model content
Purpose of utility model:
The utility model provides a kind of raising SCR temperature of reactor system and device and method, and the purpose is to for large-scale electricity The long-term underrun of unit boiler of standing, SCR inlet cigarette temperature is relatively low, has a strong impact on its efficiency, can not meet asking for environmental requirement Topic.
Technical scheme:
Improve SCR temperature of reactor system and devices, including boiler reversal chamber and economizer, it is characterised in that:Turn in boiler Two bypass ducts are accessed to room to the SCR reactor inlet flues of economizer exit.
Two bypass ducts use circular pipe.
The valve of controlling switch is provided with pipeline, the valve is controlled by boiler DCS, while SCR reactors The temperature sensor of entrance also accesses boiler DCS.
Anti-air-leakage locking device is additionally provided with the joining place of bypass duct and SCR reactor inlet flues, the device bag Include compression button and Strain lock;The leakage proof gasket for compressing shell fragment and being pressed on pipeline joining place is provided with compression button, compresses shell fragment Withstand between compression button and leakage proof gasket;Strain lock includes tensing arm and turnbuckle, tenses arm and is divided into two up and down, upper tension arm It is buckled in compress by hook and connection is realized in the groove for buckling wall, lower tension arm is buckled in also by hook compresses the groove for detaining wall It is interior to realize connection, connected between upper tension arm and lower tension arm by connecting thick stick, turnbuckle is through connection thick stick and with being connected thick stick Threaded connection.
The side for the raising SCR reactor inlet cigarette temperature implemented using above-mentioned raising SCR temperature of reactor system and devices Method, it is characterised in that:This method is turned from boiler at low load using the pressure difference formed between boiler difference heating surface when running 510 DEG C~550 DEG C of moderate oven cigarette is extracted to room, is divided into 2 circular pipes, connection is reacted into the SCR of economizer exit Device gas approach, when SCR reactor inlet cigarettes temperature is less than 320 DEG C, medium temperature flue gas system is opened, after being re-mixed with main flue gas 20 DEG C~30 DEG C of SCR inlet cigarette temperature is improved, SCR reactors is normally put at low load, improves out of stock efficiency, meets environmental protection Index.
The pressure formed when this method utilizes boiler operatiopn between 2 grades of heating surfaces of reversal chamber and low temperature superheater and economizer Difference, the temperature difference, about 550 DEG C of moderate oven cigarette is extracted at boiler reversal chamber, respectively SCR reactor of the connection into economizer exit Gas approach, after being re-mixed with the flue gas of relatively low temperature, catalyst optimal reaction temperature is not less than 320 DEG C, improves de- Sell efficiency.
Following condition must be provided simultaneously with by extracting the selection of position:The flue gas pressures height for extracting position is enough to provide Exhaust gas volumn;Extracting the Gas Parameters of position has the requirement of higher temperature.
The exhaust gas volumn of extraction is no more than 10% of total exhaust gas volumn under the load.
Two circular pipes use 12Cr1MoV φ 1300mm circular pipes.
Round pipe road one side uses 2 Valve controllings, wherein 1 is shutoff door, another 1 is regulation door.
Advantage and effect:
The utility model is a kind of method and device of raising SCR reactor inlet cigarette temperature.For large-scale power station unit pot The underrun of furnace superintendent phase, SCR inlet cigarette temperature is relatively low, has a strong impact on its efficiency, the problem of can not meeting environmental requirement, proposes one Kind improves SCR reactor inlet cigarette temperature system and devices.The system utilizes the pressure difference formed when running between boiler difference heating surface, The moderate oven cigarette close to 510 DEG C~550 DEG C is extracted at boiler reversal chamber, is divided into 2 bypass ducts, connects and go out into economizer The SCR reactor inlet flues of mouth.The exhaust gas volumn of extraction is no more than 10% of total exhaust gas volumn under the load, and extraction amount is relatively adapted to, Boiler feedwater and main reheat steam temperature are influenceed little.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is Anti-air-leakage locking device structure schematic diagram;
Fig. 3 is Fig. 2 left view;
Each position positive/negative-pressure distribution map in cigarette air channel when Fig. 4 is balanced draft.
8 be low-temperature reheater in Fig. 1, and 9 be low temperature superheater, and 10 be reversal chamber, and 11 be shutoff door, and 12 is take out stove mouth, 13 be compensator, and 14 be regulation door, and 15 be SCR system, and 16 be ash discharging hole.
17- burners in Fig. 4;18- burner hearths;19- superheaters, reheater;20- economizers;21- air preheaters;22- is sent Blower fan;23- dedusters;24- air-introduced machines;25- chimneys.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings:
As illustrated, the utility model proposes one kind to improve SCR temperature of reactor system and devices, including boiler reversal chamber And economizer, two bypass ducts are accessed at boiler reversal chamber to the SCR reactor inlet flues of economizer exit.
Two bypass ducts use circular pipe.
The valve of controlling switch is provided with pipeline, the valve is controlled by boiler DCS, while SCR reactors The temperature sensor of entrance also accesses boiler DCS.
Anti-air-leakage locking device is additionally provided with the joining place of bypass duct and SCR reactor inlet flues, the device bag Include compression button 1 and Strain lock;The leakage proof gasket 2 for compressing shell fragment 3 and being pressed on pipeline joining place is provided with compression button 1, is compressed Shell fragment 3 is withstood between compression button 1 and leakage proof gasket 2;Strain lock includes tensing arm 4 and turnbuckle 5, tenses arm 4 and is divided to for upper and lower two Individual, upper tension arm, which is buckled in by hook 6 in the groove for compressing 1 upper wall of button, realizes connection, and lower tension arm is buckled in pressure also by hook Link closely 1 lower wall groove in realize connection, it is upper tension arm and it is lower tension arm between connected by connecting thick stick 7, turnbuckle 5 passes through Connection thick stick 7 is simultaneously threadedly coupled with being connected thick stick 7.Fine jade twists turnbuckle 5 during use, when turnbuckle 5 withstands standpipe, continues fine jade Twist, tensing arm 4 will pull compression button 1 to compress leakage proof gasket 2, and it is to preferably realize compression, realize simultaneously to compress shell fragment 3 Compliant pressure, prevent rigidity from compressing the damage to caused by pipeline.The device be in order that pipeline junction it is tighter, prevent Only run cigarette or run the generation of wind phenomenon, improve operating efficiency.
The system is using the pressure difference formed between boiler difference heating surface when running, at low load at boiler reversal chamber 510 DEG C~550 DEG C of moderate oven cigarette is extracted, is divided into 2 φ 1300mm circular pipes using 12Cr1MoV, connection, which enters, saves coal The SCR reactor inlet flues of device outlet.When SCR reactor inlet cigarettes temperature is less than 320 DEG C, medium temperature flue gas system is opened, with Main flue gas improves 20 DEG C~30 DEG C of SCR inlet cigarette temperature after re-mixing, and SCR reactors is normally put at low load, improves Out of stock efficiency, meets environmental protection index.Because the exhaust gas volumn of extraction is no more than 10% of total exhaust gas volumn under the load, extraction amount is relatively suitable Close, boiler feedwater, main reheat steam temperature and boiler efficiency are influenceed little.Device is as shown in Figure 1.
Project plan comparison:It is better than following two modification schemes comprehensively in the large-scale power station unit boiler program,
The bypass smoking mouth of state's electricity Shuangyashan Installation in Plant is steel plate in economizer entrance, herein wall, other without boiler tube Road flue is designed using bobbin carriage, extracts about 500 DEG C of flue gases, is per side gas bypass flue:1200×9200.
The bypass smoking mouth of state's electricity Kangping Installation in Plant is after stove between the low superheater of back-end ductwork I and II, in afterbody Enclosure wall tube upper shed, about 500 DEG C of flue gases are extracted, bypass flue is designed using bobbin carriage, is per side gas bypass flue:8000× 5000。
Above-mentioned two system can only use electronic double blinds baffle plate gate controls due to using square pipe design, Because dust causes valve to be adjusted flexibly during operation, do not have an adjustment effect, or because be not closed completely and caused by smoke spillage, Not only increase fuel, the increase of boiler inlet water temperature, exhaust gas temperature improves, and influences boiler efficiency, increases coal consumption, while steel consumption Also much larger than this programme.
Present design chosen position difference cigarette temperature is higher about 550 DEG C, therefore, it is less with regard to that can meet need to extract exhaust gas volumn Will, and the device is designed using circular pipe, flexible adjustment, is adjusted as needed at any time, construction costs is no more than 200 Ten thousand, and the design of above two gas bypass is more than 6,000,000 yuan.
One kind improves the calculating of SCR reactor inlet cigarette temperature system and device and is shown in Table 1, and investment estimate is shown in Table 2.
The 40%THA result of calculations of table 1
The device is after the implementation of Yanshan Mountain lake 600MW unit boilers, and reliably, stably, NOx emission is in 45mg/ for boiler operatiopn Nm3, out of stock efficiency and boiler efficiency reach design level, achieve Expected Results.The statistics in the end of the year 2014,300,000 multikilowatts Coal unit has 880, and 600,000 multikilowatts have 481, and it is about 700,000,000 kilowatts that both, which install, is the master of coal electricity flexibility transformation Power unit.To the year two thousand twenty, fired power generating unit transforms scale about at 200,000,000 kilowatts~2.4 hundred million kilowatts, and potential market is huge, therefore, gathers around There is huge promotional value.
Operational effect is shown in Table 3.
Table 2 is a kind of to improve SCR reactor inlet cigarette temperature system and device expenses
Table 3 is a kind of to be improved SCR reactor inlet cigarette temperature system and devices and puts into operation effect
Key technology
Formed when its operation principle utilizes boiler operatiopn between 2 grades of heating surfaces of reversal chamber and low temperature superheater and economizer Pressure difference, the temperature difference, about 550 DEG C of moderate oven cigarette is extracted at boiler reversal chamber, connection respectively is reacted into the SCR of economizer exit Device gas approach, re-mixed in the flue gas with relatively low temperature, to reach catalyst optimal reaction temperature not less than 320 DEG C, Improve out of stock efficiency.
As shown in each position positive/negative-pressure distribution map in cigarette air channel during Fig. 4 balanced drafts.
Extract position.The selection of Gas Parameters directly affects the effect of boiler improvement transformation, the selection reply of Gas Parameters Equipment, system consider that following condition must be provided simultaneously with by extracting the selection of position comprehensively:Extract the higher energy of flue gas pressures of position Enough exhaust gas volumns are provided;Extracting the Gas Parameters of position has the requirement of higher temperature.
Because large-sized station boiler uses balanced draft, there is resistance damage in boiler smoke when flowing through each heating surface Lose, therefore.Form certain pressure difference and the temperature difference between each heating surface upstream and downstream, utility model extracted at boiler reversal chamber compared with High medium temperature flue gas, while be 300 with 500 DEG C~550 DEG C of medium temperature flue gas cigarette temperature using the temperature difference formed between heating surface DEG C economizer exit flue gas, the exhaust gas volumn of extraction is no more than 10% of total exhaust gas volumn under the load, boiler operatiopn influenceed very It is micro-.Flue gas is extracted automatically using the pressure difference that is formed between boiler heating surface, the temperature difference.
Tube shaped, square pipeline or circular pipe are taken, take external thermal insulation or inside holding.Due to pressured poor work Make, it is necessary to reduce resistance of ducting loss as far as possible, ensure enough pressure differences.Outer guarantor is greater than using the resistance of ducting of inside holding mode The pipeline of warm form, while according to square pipeline, select shutter door, be difficult to control, easily leakage.Therefore, using circle Heat-resisting pipeline, and designed using external thermal insulation, reduce the resistance of ducting.
Tubing is chosen.Pipe material uses 12Cr1MoV.Due to the medium temperature that the flue gas medium of extraction is 500 DEG C~550 DEG C Flue gas, it is 580 DEG C that design tubing, which chooses maximum permissible temperature,.
Come into operation at any time under underload, and the normal switching-off under other loads.
Come into operation at any time under underload, and the normal switching-off under other loads.It is divided into 2 12Cr1MoV circular pipes, it is unilateral Using 2 Valve controllings, wherein 1 is shutoff door, another 1 is regulation door, and 2 valves therein are using high temperature resistant, wear-resistant material. Control, be easy to adjust, not influenceing the economical operation of boiler.
Innovative point
Flue gas is extracted automatically using the pressure difference that is formed between boiler heating surface, the temperature difference;
Take circular pipe to design, and take external thermal insulation form;
System is come into operation at any time at low load using regulation door, and the normal switching-off under other loads.

Claims (3)

1. one kind improves SCR temperature of reactor system and devices, including boiler reversal chamber and economizer, it is characterised in that:In boiler Two bypass ducts are accessed at reversal chamber to the SCR reactor inlet flues of economizer exit;
Anti-air-leakage locking device is additionally provided with the joining place of bypass duct and SCR reactor inlet flues, the device includes pressure Link closely(1)And Strain lock;Detained compressing(1)Inside it is provided with compression shell fragment(3)With the leakage proof gasket for being pressed on pipeline joining place(2), Compress shell fragment(3)Withstand on compression button(1)And leakage proof gasket(2)Between;Strain lock includes tensing arm(4)And turnbuckle(5), tense Arm(4)It is divided into two up and down, upper tension arm passes through hook(6)It is buckled in compression button(1)Connection, lower tension are realized in the groove of upper wall Arm is buckled in compression button also by hook(1)Connection is realized in the groove of lower wall, passes through connection between upper tension arm and lower tension arm Thick stick(7)Connection, turnbuckle(5)Through connection thick stick(7)And with being connected thick stick(7)Threaded connection.
2. raising SCR temperature of reactor system and devices according to claim 1, it is characterised in that:Two bypass ducts are adopted Use circular pipe.
3. raising SCR temperature of reactor system and devices according to claim 1, it is characterised in that:It is provided with pipeline The valve of controlling switch, the valve are controlled by boiler DCS, while the temperature sensor of SCR reactor inlets also accesses Boiler DCS.
CN201621314287.6U 2015-12-16 2016-12-02 Improve SCR temperature of reactor system and devices Expired - Fee Related CN207162509U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2015210506062 2015-12-16
CN201521050606 2015-12-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106765035A (en) * 2015-12-16 2017-05-31 华电电力科学研究院东北分院 Improve SCR temperature of reactor system and device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106765035A (en) * 2015-12-16 2017-05-31 华电电力科学研究院东北分院 Improve SCR temperature of reactor system and device and method

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