CN206831475U - A kind of denitrating flue gas humidity control system based on flue gas recirculating technique - Google Patents
A kind of denitrating flue gas humidity control system based on flue gas recirculating technique Download PDFInfo
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- CN206831475U CN206831475U CN201720338866.2U CN201720338866U CN206831475U CN 206831475 U CN206831475 U CN 206831475U CN 201720338866 U CN201720338866 U CN 201720338866U CN 206831475 U CN206831475 U CN 206831475U
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Abstract
It the utility model is related to a kind of denitrating flue gas humidity control system based on flue gas recirculating technique, it is installed in coal unit therrmodynamic system, it is characterized in that, the system includes flue and flue gas recirculation booster fan, flue gas recirculation booster fan is arranged on flue, the entrance connection air-introduced machine exhaust pass of flue, i.e. fume extraction clicks self-induced-air machine exhaust pass, the outlet of flue is connected with the SOFA bellows of boiler-burner, i.e. flue gas blending point is located at SOFA bellows.The beneficial effects of the utility model are, because flue gas is blended on main burner top, alleviate main burner region First air, influence of the secondary air flow mixing stove cigarette for burning, realizing boiler, denitrating system denitration efficiency caused by inlet flue gas temperature is low declines in low- load conditions, the problem of denitrating system can not normally be put into, improve denitrating system operational reliability under boiler for deeply peak regulation background.
Description
Technical field
The present invention relates to Thermal generation unit field, more particularly to a kind of denitrating flue gas temperature based on flue gas recirculating technique
Regulating system is spent, suitable for improving back-end ductwork flue-gas temperature under underload, so as to improve denitration efficiency, ensures environmental requirement
Flue gas thermoregulating system.
Background technology
Since " 13 ", fired power generating unit depth peak regulation application has become the urgent problem that current power industry faces.
For solar energy, wind-powered electricity generation, water power emerging energy abandons the serious phenomenon of electricity, and on June 14th, 2016, Bureau of Energy formally started lifting fire
Electric flexibility transformation demonstration pilot project work, during " 13 ", flexibility transforms scale up to 2.2 hundred million kilowatts, wherein thermoelectricity unit
1.33 hundred million kilowatts（Mainly in three northern areas of China）, 0.87 hundred million kilowatts of pure condensate unit.Account for 25% or so of existing coal Denso machine.
The situation of each power plant such as type of furnace, coal is different, and cigarette temperature-load curve is different, but with load cigarette temperature
Downward trend is the same.If not there is measure, some power plant in 50% load or so SCR just because not reaching inlet flue gas temperature and
It is out of service.Under even following 20% load of 30% load, SCR inlet cigarette temperature will reduce more, be lifted in low- load conditions
Exhaust gas temperature turns into important topic before denitration.
The conventional method for lifting boiler back end ductwork denitration cigarette temperature under underload mainly has three kinds, respectively installs economizer additional
Bypass, install gas bypass additional, install economizer recirculating system additional, because denitration of boiler smoke device is often the increase of original flue
Part, space is relatively narrow, and further retrofit work is limited by site space, it is difficult to carries out.Above-mentioned three kinds of transformations are thrown simultaneously
Provide expensive, boiler operatiopn is had a certain impact, less use in practice.
The content of the invention
The present invention is to make up the deficiencies in the prior art, there is provided a kind of denitrating flue gas temperature based on flue gas recirculating technique is adjusted
Section system, suitable for improving back-end ductwork flue-gas temperature under underload, so as to improve denitration efficiency, ensure the flue gas of environmental requirement
Thermoregulating system.
Meanwhile the present invention also provides the progress control method for being applied to the adjustment of boiler back end ductwork cigarette temperature.
The present invention adopts the following technical scheme that realization：
The denitrating flue gas humidity control system based on flue gas recirculating technique of the present invention, is installed on coal unit heating power system
In system, it is characterised in that the system includes flue and flue gas recirculation booster fan, the installation of flue gas recirculation booster fan
On flue, the entrance connection air-introduced machine exhaust pass of flue, i.e. fume extraction clicks self-induced-air machine exhaust pass,
The outlet of flue is connected with the SOFA bellows of boiler-burner, i.e. flue gas blending point is located at SOFA bellows.
The entrance of flue gas recirculation booster fan sets damper, and outlet sets shut-off air door.
Leakage shut-off air door in anti-is set before flue gas blending point.
On flue after flue gas recirculation booster fan set thermal technology's measuring point, thermal technology's measuring point include temperature sensor,
Baroceptor, flow sensor, detect the temperature, pressure, flow parameter of flue gas, thermal technology's measuring point connection Boiler DCS System.
The air quantity regulation of flue gas recirculation booster fan becomes frequency modulation using variable frequency adjustment and/or power frequency regulation two ways
Section is to carry out systematic air flow regulation by adjusting blower fan revolution, and power frequency regulation is the regulation of constant speed baffle plate, by adjusting fans entrance
Baffle plate carries out air quantity regulation.
The cigarette temperature adjusting method of the denitrating flue gas humidity control system based on flue gas recirculating technique of the present invention, its feature
It is, by installing flue gas recirculation booster fan and flue additional, the flue gas of air-introduced machine outlet is boosted, is then deviateing pot
Stove main burner position is blended into upper furnace SOFA bellows, so as to which the flue gas of boiler induced-draft fan outlet is introduced into roof of the furnace two
Secondary wind, because flue gas is blended on main burner top, main burner region First air, secondary air flow mixing stove cigarette are alleviated for combustion
The influence of burning, the heat transfer ratio of Radiative heat transfer in furnace and advection flue is changed by the increase of the total exhaust gas volumn of burner hearth, in pot
Under stove running on the lower load, dynamically back-end ductwork cigarette temperature is adjusted, improves denitration efficiency.
The invention has the advantages that burner hearth is introduced by the flue gas for boiler induced-draft fan being exported in flue gas recirculation system
Top Secondary Air, flue gas recycled incorporation pulverized coal preparation system or main burner region secondary air system had both been avoided for burning
Adverse effect, and can enough change the heat transfer ratio of Radiative heat transfer in furnace and advection flue by the increase of the total exhaust gas volumn of burner hearth
Example, reaches under boiler at low load operating mode, the purpose being dynamically adjusted to back-end ductwork cigarette temperature.Scheme provided by the invention
Suitable for coal unit pulverized-coal fired boiler.The different type of furnaces set different blending positions, realize and lift back-end ductwork under running on the lower load
Flue-gas temperature, improve the purpose of denitration efficiency.
The present invention after installing the flue gas boosting that gas recirculating fan exports induced-draught fan additional by deviateing boiler main burning
The blending of device position such as enters upper furnace SOFA bellows, and different blending positions is designed for the different type of furnaces, and flue gas recycled draws
Enter to change the heat absorption ratio of boiler internal burner hearth and horizontal flue heating surface, improve boiler back end ductwork cigarette temperature.The present invention
Including stove cigarette flue, booster fan, fans entrance regulation door, exporting shutoff door, stove cigarette blending shutoff door, DCS control systems
Deng.Because flue gas is blended on main burner top, main burner region First air, secondary air flow mixing stove cigarette are alleviated for burning
Influence, realize boiler in low- load conditions denitrating system due to inlet flue gas temperature it is low caused by denitration efficiency decline, denitration
The problem of system can not normally be put into, improves denitrating system operational reliability under boiler for deeply peak regulation background, mitigation know clearly because
The exceeded environmental issues brought of NOX and air preheater are due to excessive denitrfying agent caused by departing from denitration optimum response area for cigarette temperature
Caused blockage problem.
Brief description of the drawings
Fig. 1 is present system schematic diagram.
In figure, 1 flue gas recirculation booster fan, 2 air-introduced machine exhaust pass, 3 fans entrances regulation door, 4 blower fans go out
Mouth shutoff door, the anti-interior leakage shutoff door of 5 the system flues 6,7 systems, 8 SOFA bellows, 9 thermal technology's measuring points, 10 burnings
Device, 11 air preheaters, 12 dedusters, 13 air-introduced machines, 14 chimneys.
Embodiment
Accompanying drawing is a kind of specific embodiment of the invention.
The denitrating flue gas humidity control system based on flue gas recirculating technique of the present invention, is installed on coal unit heating power system
In system, the system includes flue 5 and flue gas recirculation booster fan 1, and flue gas recirculation booster fan is arranged on fume pipe
On road, the entrance connection air-introduced machine exhaust pass 2 of flue, i.e. fume extraction clicks self-induced-air machine exhaust pass, fume pipe
The outlet in road is connected with the SOFA bellows 8 of boiler-burner, i.e. flue gas blending point is located at SOFA bellows.
The entrance of flue gas recirculation booster fan sets damper 3, and outlet sets shut-off air door 4.
Leakage shut-off air door 6,7 in anti-is set before flue gas blending point.
Thermal technology's measuring point 9 is set on the flue after flue gas recirculation booster fan 1, and thermal technology's measuring point includes TEMP
Device, baroceptor, flow sensor, detect the temperature, pressure, flow parameter of flue gas, and the wire of thermal technology's measuring point is connected to pot
Stove DCS system（Dcs）In.
The air quantity regulation of flue gas recirculation booster fan becomes frequency modulation using variable frequency adjustment and/or power frequency regulation two ways
Section is to carry out systematic air flow regulation by adjusting blower fan revolution, and power frequency regulation is the regulation of constant speed baffle plate, by adjusting fans entrance
Baffle plate carries out air quantity regulation.
The cigarette temperature adjusting method of the denitrating flue gas humidity control system based on flue gas recirculating technique of the present invention, by adding
Flue gas recirculation booster fan and flue are filled, the flue gas of air-introduced machine outlet is boosted, is then deviateing boiler main burner
Position is blended into upper furnace SOFA bellows, so as to which the flue gas of boiler induced-draft fan outlet is introduced into roof of the furnace Secondary Air, due to
Flue gas is blended on main burner top, alleviates main burner region First air, influence of the secondary air flow mixing stove cigarette for burning,
The heat transfer ratio of Radiative heat transfer in furnace and advection flue is changed by the increase of the total exhaust gas volumn of burner hearth, in boiler at low load work
Under condition, dynamically back-end ductwork cigarette temperature is adjusted, improves denitration efficiency.
The denitrating flue gas humidity control system based on flue gas recirculating technique of the present invention, is installed on generating set heating power system
In system, air-introduced machine exhaust pass 2 is used as the system import, and the system flue 5 is connected with air-introduced machine exhaust pass 2, in the system
Installation recycling freq uency conversion supercharging blower fan 1 on flue 5, the follow-up flue of blower fan is connected with boiler SOFA bellows 8.
The exiting flue gas pipeline of air-introduced machine is the access point of the system, from bilateral air-introduced machine exhaust pass or mixing flue
Access.
Described air-introduced machine exiting flue gas pipeline is connected with the system gas approach, and frequency conversion is installed on gas approach
Recirculation blower lifting system pressure head, overcomes flue gas recycled flow resistance.
Damper is set on fans entrance flue, shut-off air door is set on fan outlet flue, flow system flow is adjusted
Section is using double shaping modes, i.e. blower fan gearshift adjustment and the regulation of blower fan constant speed baffle plate.
For quadrangle tangential circle and opposed firing both conventional coal-powder boilers, system flue access boiler SOFA wind
Case（SOFA wind, which refers to, is arranged in the generation for apart from the uppermost one layer of Secondary Air of primary combustion zone, being primarily used to suppress NOx and drop
Low torch temperature（Reduce power type NOX precipitation）.
Shut-off air door 6,7 is set before flue connects burner top SOFA bellows, anti-locking system is because of reduced air
Machine outlet shutoff door does not cause system air leakage sternly, influences boiler combustion.
Back-end ductwork cigarette temperature is adjusted by the method for increasing and decreasing recirculating air volume, cigarette temperature rises when increasing air quantity, subtracts
During few air quantity, cigarette temperature declines.
During system operation, there are two kinds of regulative modes, first, variable frequency adjustment, systematic air flow tune is carried out by adjusting blower fan revolution
Section, second, constant speed baffle plate is adjusted, air quantity regulation is carried out by adjusting fans entrance baffle plate.
Turn off SOFA bellows 8 at the top of the rear pass of air door 4 connection boiler-burner.
Boiler DCS System（Dcs）In, burner 10, SOFA bellows 8, air preheater 11, deduster
12nd, air-introduced machine 13, chimney 14 are sequentially connected.
Claims (4)
1. a kind of denitrating flue gas humidity control system based on flue gas recirculating technique, is installed in coal unit therrmodynamic system,
Characterized in that, the system includes flue and flue gas recirculation booster fan, flue gas recirculation booster fan is arranged on cigarette
In feed channel, the entrance connection air-introduced machine exhaust pass of flue, i.e. fume extraction clicks self-induced-air machine exhaust pass, flue gas
The outlet of pipeline is connected with the SOFA bellows of boiler-burner, i.e. flue gas blending point is located at SOFA bellows.
2. the denitrating flue gas humidity control system according to claim 1 based on flue gas recirculating technique, it is characterised in that：
The entrance of flue gas recirculation booster fan sets damper, and outlet sets shut-off air door.
3. the denitrating flue gas humidity control system according to claim 1 based on flue gas recirculating technique, it is characterised in that：
Leakage shut-off air door in anti-is set before flue gas blending point.
4. the denitrating flue gas humidity control system according to claim 1 based on flue gas recirculating technique, it is characterised in that：
Thermal technology's measuring point is set on the flue after flue gas recirculation booster fan, and thermal technology's measuring point includes temperature sensor, air pressure sensing
Device, flow sensor, detect the temperature, pressure, flow parameter of flue gas, thermal technology's measuring point connection Boiler DCS System.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720338866.2U CN206831475U (en) | 2017-04-01 | 2017-04-01 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
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| CN201720338866.2U CN206831475U (en) | 2017-04-01 | 2017-04-01 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969346A (en) * | 2017-04-01 | 2017-07-21 | 山东英电环保科技有限公司 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
| CN112460576A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
-
2017
- 2017-04-01 CN CN201720338866.2U patent/CN206831475U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969346A (en) * | 2017-04-01 | 2017-07-21 | 山东英电环保科技有限公司 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
| CN112460576A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200723 Address after: Room 1512, building 2, Lushang Guoao City, 9777 Jingshi Road, Lixia District, Jinan City, Shandong Province Patentee after: SHANDONG ZHIXIN ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: 250014 Shandong province Ji'nan High-tech Development Zone, Road No. 1117 Patentee before: SHANDONG ECO-POWER TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |