CN202983500U - Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization - Google Patents
Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization Download PDFInfo
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- CN202983500U CN202983500U CN 201220673447 CN201220673447U CN202983500U CN 202983500 U CN202983500 U CN 202983500U CN 201220673447 CN201220673447 CN 201220673447 CN 201220673447 U CN201220673447 U CN 201220673447U CN 202983500 U CN202983500 U CN 202983500U
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Abstract
The utility model relates to a flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization. The flue gas denitrification injection system comprises a reducing agent preparation and storage module, a reducing agent distribution and control module, and a reducing agent injection module, wherein the reducing agent preparation and storage module is used for preparing and storing the reducing agent; the reducing agent distribution and control module is connected with the flue gas denitrification injection system; the reducing agent injection module is arranged at the inlet of a cyclone separator; the reducing agent preparation and storage module is connected with the reducing agent distribution and control module; and the reducing agent distribution and control module is connected with the reducing agent injection module. The glue gas denitrification process structure of the CFB boiler is divided into the reducing agent preparation and storage module, the reducing agent distribution and control module and the reducing agent injection module. Therefore, the adaptability and the generality of the denitrification process are improved; the insertion depth of the injector is increased; the atomization quality is improved; mixing of the flue gas and the reducing agent is intensified; and the denitrification efficiency can be effectively improved.
Description
Technical field
The utility model relates to CFB boiler smoke wet denitration field, is specifically related to a kind of based on the modular flue-gas denitration process of CFB boiler and spraying system.
Background technology
During " 12 ", thermoelectricity remains main force's power supply of China." Chinese Thermal Power Generation Industry white paper " estimated, national thermoelectricity installed capacity in 2015 will reach 9.9 hundred million kilowatts.According to statistics, the NOx total amount of power plant emission in 2011 surpasses 8,600,000 tons, accounts for 35% ~ 40% of national discharge capacity, rises with electric coal consumption proportion, and the NOx discharging in following thermal power plant also will continue to increase.The formation that is emitted on acid rain of nitrogen oxide and role in the destruction of ozone layer has been obtained the proof of science, some industrially developed country are from the seventies in the world, just restriction has been done in discharging to the NOx of fired power generating unit, and along with the development of control technology, emission limit set is increasingly strict.China also classifies nitrogen oxide as atmosphere pollution overall control object during " 12 ".And promulgated " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), require all newly-built fired power generating unit and the key area unit NOx discharge capacity that puts into operation must not surpass 100mg/m
3
CFBB (CFB) combustion technology have discharged nitrous oxides low, can realize in combustion process direct desulfurization, the advantage such as combustion adaptive is wide, efficiency of combustion is high and load regulation range is large, become the first-selected type of furnace of current Coal Clean burning.China has moved so far and has surpassed thousand at the CFB boiler of building, and accounts for more than 8% of national thermoelectric generator kludge total capacity, and the CFB emission of NOx of boiler is in 100 ~ 300mg/m substantially
3Level higher than discharging standards, is occupied high specific weight in discharged nitrous oxides improvement field.Ripe gas denitrifying technology mainly contains SCR technology (SCR) and SNCR technology (SNCR) both at home and abroad, in view of CFB boiler smoke dust amount high (common coal-powder boiler 10 times), easily cause wearing and tearing, the obstruction and poisoning of SCR process catalyst, the general gas denitrifying technology of CFBB is the SNCR technology at present.
By Modelling Test and SNCR engineering practice; designed a kind of based on the modular flue-gas denitration process of CFB boiler and spraying system; this technique comprises that mainly reducing agent preparation and memory module, reducing agent distribution and control module, reducing agent spray module; each module has all been set up corresponding comparison database; according to Different field structure and flue gas condition, process route is carried out reasonably optimizing and improvement; can effectively improve reliability and the security of SNCR flue-gas denitration process, finally improve SNCR system denitration efficiency.
Summary of the invention
It is a kind of based on the modular flue gas denitrification system of CFB boiler that the utility model provides, and when strengthening recirculating fluidized bed flue-gas denitration process versatility, can improve denitration efficiency, reduces operating cost.
The technical scheme that the utility model solves is:
A kind of based on the modular denitrating flue gas spraying system of CFB boiler, comprise for the preparation of the reducing agent with the storage reducing agent and preparing and memory module, coupled reducing agent distributes and control module, the reducing agent that is positioned at cyclone inlet sprays module, it is characterized in that: described reducing agent preparation distributes with reducing agent with memory module and is connected with control module, and described reducing agent distribution is sprayed module with control module and reducing agent and is connected.
Above-mentioned reducing agent preparation and memory module comprise that the reducing agent that integrates prepares unit and memory cell.
Above-mentioned reducing agent distributes and control module comprises reducing agent allocation units and the reducing agent control module that integrates.
Above-mentioned reducing agent sprays module and adopts female management and control system, single channel regulative mode.
Reducing agent preparation and memory module are provided with water displacement and compressed air purge system.
Above-mentioned reducing agent distributes and control module is provided with the feed-back type governor motion.
It is 50mm-500mm that above-mentioned pneumatic eddy current type composite injection device gos deep into burner hearth length, can operation for a long time under 920 ℃ of environment of flue-gas temperature.
The utility model beneficial effect compared with prior art is:
1, the utility model with CFB denitration of boiler smoke process structure integratedly be divided into reducing agent preparation and storage, reducing agent distribution and control, reducing agent sprays three modules, has improved adaptability and the versatility of denitrating technique.
2, the utility model adopts pneumatic eddy current type composite injection device, has increased the injector insertion depth, improved atomization quality, has strengthened mixing of flue gas and reducing agent, can effectively improve denitration efficiency.
3, the utility model appropriate design have a feedback regulatory function reducing agent distribute and control module, can effectively improve the compound regulating power of denitrating system, strengthen the stability of denitration effect.
4, reducing agent sprays the pneumatic eddy current type composite injection device of module use, and spray angle 30 ~ 100 is adjustable continuously, and spray field drop SMD is less than 100 μ m.
Description of drawings
Fig. 1 is technological process of the present utility model
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is described in the utility model based on the modular flue-gas denitration process of CFB boiler and spraying system, comprises reducing agent preparation and memory module 1, and coupled reducing agent distributes and control module 2, and the reducing agent that is positioned at cyclone inlet sprays module 3.Former dose of preparation is connected with memory module to distribute to be connected with control module with reducing agent and is connected, and described reducing agent distributes to be connected with control module and is connected with reducing agent injection module 3, and it is near the cyclone inlet of 850 ~ 920 ℃ that reducing agent injection module 3 is arranged on temperature.
SCR-SNCR combined denitration technique of the present utility model and the spraying system course of work are: enter reducing agent from the reducing agent that reducing agent prepares and memory module pumps and distribute and control module, after regulating through feedback, appropriate reducing agent sprays module by reducing agent and enters separator inlet atomizing, evaporation, give birth to reaction with the abundant hybrid concurrency of flue gas in separator, complete removing of nitrogen oxide.
Adopt CFB boiler modularization flue-gas denitration process of the present utility model and spraying system to be successfully applied to two the 300MW recirculating fluidized beds in certain power plant (CFB) boiler, the denitrating flue gas rate surpasses 67.4%, the product stable and reliable operation.
The foregoing description of present embodiment and accompanying drawing have represented preferred version of the present utility model, concrete enforcement can be carried out the integrated of technological process and spraying system and improve within not departing from the scope that the utility model claim defines according to boiler structure, separator inlet structure and design parameter, therefore, the utility model is widely.
Claims (7)
1. one kind based on the modular denitrating flue gas spraying system of CFB boiler, comprise for the preparation of the reducing agent with the storage reducing agent and preparing and memory module (1), coupled reducing agent distributes and control module (2), the reducing agent that is positioned at cyclone inlet sprays module (3), it is characterized in that: described reducing agent preparation distributes with reducing agent with memory module (1) and is connected with control module (2), and described reducing agent distributes with control module (2) and reducing agent injection module (3) and is connected.
2. according to claim 1 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: described reducing agent preparation and memory module comprise that the reducing agent that integrates prepares unit and memory cell.
3. according to claim 1 and 2 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: described reducing agent distributes and control module (2) comprises reducing agent allocation units and the reducing agent control module that integrates.
4. according to claim 3 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: described reducing agent sprays module and adopts female management and control system, single channel regulative mode.
5. according to claim 4 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: reducing agent preparation and memory module are provided with water displacement and compressed air purge system.
6. according to claim 5 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: described reducing agent distributes and control module (2) is provided with the feed-back type governor motion.
7. according to claim 6 based on the modular denitrating flue gas spraying system of CFB boiler, it is characterized in that: it is 50mm-500mm that described pneumatic eddy current type composite injection device gos deep into burner hearth length, can operation for a long time under 920 ℃ of environment of flue-gas temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220673447 CN202983500U (en) | 2012-12-08 | 2012-12-08 | Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220673447 CN202983500U (en) | 2012-12-08 | 2012-12-08 | Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization |
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| CN202983500U true CN202983500U (en) | 2013-06-12 |
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| CN 201220673447 Expired - Lifetime CN202983500U (en) | 2012-12-08 | 2012-12-08 | Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
-
2012
- 2012-12-08 CN CN 201220673447 patent/CN202983500U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: XI'AN AEROSPACE YUAN DONGLI ENGINEERING Co.,Ltd. Assignor: The 11th Research Institute of the Sixth Research Institute of China Aerospace Science and Technology Corporation Contract record no.: 2015610000005 Denomination of utility model: Flue gas denitrification injection system based on CFB (circulating fluid bed) boiler modularization Granted publication date: 20130612 License type: Exclusive License Record date: 20150316 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |