CN202778276U - Denitration system for coal-fired industrial boiler smoke selective catalytic reduction (SCR) method - Google Patents
Denitration system for coal-fired industrial boiler smoke selective catalytic reduction (SCR) method Download PDFInfo
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- CN202778276U CN202778276U CN 201220325258 CN201220325258U CN202778276U CN 202778276 U CN202778276 U CN 202778276U CN 201220325258 CN201220325258 CN 201220325258 CN 201220325258 U CN201220325258 U CN 201220325258U CN 202778276 U CN202778276 U CN 202778276U
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Abstract
The utility model discloses a denitration system for a coal-fired industrial boiler smoke selective catalytic reduction (SCR) method. The system comprises high-temperature cyclone dust removal devices, an SCR denitration device which takes an urea solution as a reducing agent, and an economizer, wherein each high-temperature cyclone dust removal device is provided with an inlet flue and an outlet flue; an inlet flue valve is arranged at the inlet flue; the inlet flue of each high-temperature cyclone dust removal device is connected with a boiler; the outlet flue of each high-temperature cyclone dust removal device is connected with the SCR denitration device; a urea tank, a urea solution preparation tank, a pyrolyzing furnace and a mixer are sequentially connected through a pipeline and are further connected with the front end of the SCR denitration device through an injection device; and the economizer is arranged at the tail end of the SCR denitration device. The urea solution serves as the reducing agent, and compared with the traditional method for taking ammonia water as the reducing agent in a large power station boiler, the system has the advantages that the operating cost is reduced by 30-40 percent; and due to the modular high-temperature cyclone dust removal devices, the industrial boiler SCR method denitration system is stable to operate, and the problem that the industrial boiler has high load change is actually solved.
Description
Technical field
The utility model relates to coal-burned industrial boiler denitration field, particularly a kind of denitrating system for coal-burned industrial boiler flue gas SCR method.
Background technology
At present, domestic SCR method denitration technology relies on introduction, digestion and the again innovation of external coal-fired power station boiler SCR method denitration technology mostly.Yet, along with country to the improving constantly of Industrial Boiler smoke gas treatment standard, require gradually the supporting denitrating system of Industrial Boiler.
For " large-scale technology miniaturization " problem, domestic technique is relatively deficient comparatively speaking, its mainly not have the reason of realization have following some:
1, for Industrial Boiler, the transportation of ammoniacal liquor is relatively costly with the auxiliary facility that the storage link requires, and safety measure is many, need workman's complicated operation, and the operations staff is more.A large amount of economic inputs and the operating cost of great number are that industrial enterprise is unaffordable.
2, the Industrial Boiler load variations is frequent, especially northern heating boiler, and heating period has the cold phase of just cold phase, freeze-up and end in the winter time.Boiler load is mostly 30%～40%, 60%～80%, 80%～100% 3 gear operation.The high-temperature dust removing device that is arranged on the SCR leading portion is to adopt the cyclone dust removal principle mostly, mainly by inertia force and gravity principle.And when boiler load hour, under the flue gas quantitative change, in the constant situation of sectional area, speed also obviously descends, and does not have speed just can't produce the inertia force of rotation, causes dust removing effects not good, thereby after causing entering catalyst catalyst is stopped up in a large number.
3, the outlet temperature behind the combustion of industrial boiler is lower.The most of needs just can reach 300 ℃ temperature behind the original economizer of dismounting.
Summary of the invention
Goal of the invention: in order to solve above-mentioned technical problem of the prior art, provide a kind of denitrating system for coal-burned industrial boiler flue gas SCR method.
The technical scheme that adopts: a kind of denitrating system for coal-burned industrial boiler flue gas SCR method is provided, has comprised: high-temp. vortex dust arrester 9, adopt urea liquid as SCR denitrification apparatus 7, the economizer 5 of reducing agent; High-temp. vortex dust arrester 9 is provided with inlet flue duct 10, exhaust pass 11, and inlet flue duct 10 places are provided with the inlet flue duct valve, and the inlet flue duct 10 of high-temp. vortex dust arrester 9 is connected with boiler 8, and exhaust pass 11 is connected with SCR denitrification apparatus 7; Urea tank 1, urea liquid preparation tank 2, pyrolysis oven 3, blender 4 connect successively by pipeline, and further are connected with the front end of SCR method denitrification apparatus 7 by injection apparatus 6, and economizer 5 is arranged in the end of SCR denitrification apparatus 7.
Wherein, the quantity of described high-temp. vortex dust arrester 9 is three, opens separately a high-temp. vortex dust arrester 9 when boiler 8 load 30%～40%, and the inlet flue duct valve of other two high-temp. vortex dust arresters 9 is in closed condition; When boiler 8 load 60%～80%, open two high-temp. vortex dust arresters 9, the inlet flue duct valve of an other high-temp. vortex dust arrester 9 is in closed condition; When boiler 8 load 80%～100%, three high-temp. vortex dust arresters 9 are all opened.
Beneficial effect: the utility model is that the denitration of Industrial Boiler SCR method has searched out economic and practical feasible scheme, adopt urea liquid as reducing agent, greatly reduce the operating cost of SCR method denitrating system, adopt ammoniacal liquor to reduce 30%～40% as the operating cost of the method for reducing agent than traditional large-sized station boiler.The utility model has been installed the Modular high-temperature cyclone dust collector so that the operation of Industrial Boiler SCR method denitrating system is more stable, the solution that gears to actual circumstances the large problem of Industrial Boiler load variations.Economizer is installed to SCR method denitrating system rear end and has also solved the low drawback of Industrial Boiler exit gas temperature.
Description of drawings
Fig. 1 is the denitrating system schematic diagram that the utility model is used for coal-burned industrial boiler flue gas SCR method.
Accompanying drawing sign: 1-urea tank, 2-urea liquid preparation tank, 3-pyrolysis oven, 4-blender, 5-economizer, 6-injection apparatus, 7-SCR denitrification apparatus, 8-boiler, 9-high-temp. vortex dust arrester, 10-inlet flue duct, 11-exhaust pass.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is elaborated.
A kind of denitrating system for coal-burned industrial boiler flue gas SCR method of the utility model comprises: high-temp. vortex dust arrester 9, adopt urea liquid as SCR denitrification apparatus 7, the economizer 5 of reducing agent; High-temp. vortex dust arrester 9 is provided with inlet flue duct 10, exhaust pass 11, and inlet flue duct 10 places are provided with the inlet flue duct valve, and the inlet flue duct 10 of high-temp. vortex dust arrester 9 is connected with boiler 8, and exhaust pass 11 is connected with SCR denitrification apparatus 7; Urea tank 1, urea liquid preparation tank 2, pyrolysis oven 3, blender 4 connect successively by pipeline, and further are connected with the front end of SCR denitrification apparatus 7 by injection apparatus 6; Economizer 5 is arranged in the end of SCR denitrification apparatus 7, and the method for this postposition has solved the temperature required high problem of denitrating system, has solved again the effect of not wasting heat energy by high-temperature flue gas after the denitration.
For the large characteristics of Industrial Boiler load variations, guarantee SCR method denitration stable operation, catalyst is not subjected to the interference of high dust, adopt the Modular high-temperature cyclone dust collector that the Industrial Boiler flue gas is carried out dedusting, the quantity of described high-temp. vortex dust arrester 9 is three, open separately a high-temp. vortex dust arrester 9 when boiler 8 load 30%～40%, the inlet flue duct valve of other two high-temp. vortex dust arresters 9 is in closed condition; When boiler 8 load 60%～80%, open two high-temp. vortex dust arresters 9, the inlet flue duct valve of an other high-temp. vortex dust arrester 9 is in closed condition; When boiler 8 load 80%～100%, three high-temp. vortex dust arresters 9 are all opened.By the automatic control programming, the electrically operated valve before every dust arrester import is made PLC modularity control program.Make its operation easy.
Workflow: the flue gas of boiler 8 enters high-temp. vortex dust arrester 9 by inlet flue duct 10, enters SCR denitrification apparatus 7 by exhaust pass 11 after the dedusting; Urea is stored in the urea tank 1, is prepared into 50% urea liquid by urea liquid preparation tank 2, and carries out pyrolysis in the pyrolysis oven 3 under 343-450 ℃ of condition, produces ammonia and carbon dioxide, further is ejected in the SCR denitrification apparatus 7 by injection apparatus 6; Carry out chemical reaction as the ammonia of reducing agent and carbon dioxide and flue gas, thereby realize the purpose of coal-burned industrial boiler denitration.
The investment of liquefied ammonia station is large, floor space is large, safety measure is many, security risk is high and operating cost is high, native system adopts urea liquid, generate ammonia and carbon dioxide as reducing agent by pyrolysis oven, its advantage is without potential safety hazard, operating cost low, simple to operate.
Above content is the further description of the present invention being done in conjunction with optimal technical scheme, can not assert that the implementation of invention only limits to these explanations.Concerning the general technical staff of the technical field of the invention, under the prerequisite that does not break away from design of the present invention, can also make simple deduction and replacement, all should be considered as protection scope of the present invention.
Claims (2)
1. the denitrating system that is used for coal-burned industrial boiler flue gas SCR method, it is characterized in that described denitrating system for coal-burned industrial boiler flue gas SCR method comprises: high-temp. vortex dust arrester (9), adopt urea liquid as SCR denitrification apparatus (7), the economizer (5) of reducing agent; High-temp. vortex dust arrester (9) is provided with inlet flue duct (10), exhaust pass (11), and inlet flue duct (10) locates to be provided with the inlet flue duct valve, the inlet flue duct (10) of high-temp. vortex dust arrester (9) is connected with boiler (8), and exhaust pass (11) is connected with SCR denitrification apparatus (7); Urea tank (1), urea liquid preparation tank (2), pyrolysis oven (3), blender (4) connect successively by pipeline, and further be connected with the front end of SCR denitrification apparatus (7) by injection apparatus (6), economizer (5) is arranged in the end of SCR denitrification apparatus (7).
2. the denitrating system for coal-burned industrial boiler flue gas SCR method according to claim 1 is characterized in that, the quantity of described high-temp. vortex dust arrester (9) is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220325258 CN202778276U (en) | 2012-07-06 | 2012-07-06 | Denitration system for coal-fired industrial boiler smoke selective catalytic reduction (SCR) method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220325258 CN202778276U (en) | 2012-07-06 | 2012-07-06 | Denitration system for coal-fired industrial boiler smoke selective catalytic reduction (SCR) method |
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| CN202778276U true CN202778276U (en) | 2013-03-13 |
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| CN 201220325258 Expired - Fee Related CN202778276U (en) | 2012-07-06 | 2012-07-06 | Denitration system for coal-fired industrial boiler smoke selective catalytic reduction (SCR) method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768941A (en) * | 2014-02-19 | 2014-05-07 | 大唐淮南洛河发电厂 | SCR (Selective Catalytic Reduction) smoke denitration equipment and denitration method thereof |
| CN107138031A (en) * | 2017-04-28 | 2017-09-08 | 国网天津市电力公司 | A kind of denitration efficiency computational methods applied to on-site actual situations |
| CN107737527A (en) * | 2017-11-21 | 2018-02-27 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust dedusting denitrification integral system |
-
2012
- 2012-07-06 CN CN 201220325258 patent/CN202778276U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768941A (en) * | 2014-02-19 | 2014-05-07 | 大唐淮南洛河发电厂 | SCR (Selective Catalytic Reduction) smoke denitration equipment and denitration method thereof |
| CN107138031A (en) * | 2017-04-28 | 2017-09-08 | 国网天津市电力公司 | A kind of denitration efficiency computational methods applied to on-site actual situations |
| CN107737527A (en) * | 2017-11-21 | 2018-02-27 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust dedusting denitrification integral system |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20130706 |