CN204962730U - Novel pulverized coal boiler that ultralow nitrogen oxide discharged - Google Patents
Novel pulverized coal boiler that ultralow nitrogen oxide discharged Download PDFInfo
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- CN204962730U CN204962730U CN201520429597.1U CN201520429597U CN204962730U CN 204962730 U CN204962730 U CN 204962730U CN 201520429597 U CN201520429597 U CN 201520429597U CN 204962730 U CN204962730 U CN 204962730U
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- nitrous oxides
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Abstract
The utility model provides a novel pulverized coal boiler that ultralow nitrogen oxide discharged, belongs to coal fired power generation environmental protection technology field, and the water -cooling wall received hot side, curtain wall and convection heating surface in this pulverized coal boiler included furnace, boiler combustion ware, stove, and the boiler combustion ware of boiler combustion ware for having reductant generating device can generate reductant CO, the boiler combustion ware includes low NOx burner LNB and after -flame wind OFA, the water -cooling wall receives hot side, curtain wall and convection heating surface to adhere to the catalyst layer or set up independent catalyst layer at the afterbody flue along flue gas flow direction in the stove, the utility model discloses simple structure, operation are stable, need not to use amino reductant can accomplish denitration reaction, and denitration efficiency is high, showing reduction denitration cost, extensively is applicable to the pulverized coal boiler of different scale grades.
Description
Technical field
The utility model belongs to coal fired power generation environmental technology field, is specifically related to a kind of new coal powder boiler of ultralow discharged nitrous oxides.
Background technology
Along with country is to the pay attention to day by day of environmental protection, the pollutant emission of thermal power plant controls more and more stricter.According to " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) ", the newly-built Thermal generation unit NO in Middle Eastern
xdischarge will reach Gas Generator Set emission limit (50mg/m
3), the trend that minimum discharge will be the development of following coal fired power plant.
At present, the denitration mode of pulverized-coal fired boiler mainly adopts low-NO_x combustion technology in conjunction with selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR).Selective non-catalytic reduction (SNCR), without the need to using catalyst, is changed less boiler body, cost is low, but due to reducing agent in pulverized-coal fired boiler and NO mixing uniformity poor, the reaction time is short, and denitration efficiency is only 30 ~ 40%.Only have the denitration efficiency that CFBB could realize 70 ~ 80%, therefore it is limited by very large in use.
Selective catalytic reduction (SCR) is the main flow denitration technology of current pulverized-coal fired boiler, and occupation rate of market is more than 95%, and denitration efficiency generally can reach 80 ~ 90%, but it in use also exists some problems:
(1) need to arrange catalyst layer at boiler back end ductwork, transformation project difficulty of construction is large, and catalyst layer exists body resistance, have impact on the performance driving economy of unit;
(2) catalyst has service life, and need periodic replacement after inactivation, after-cost is high, and the difficult life of inactivation denitrating catalyst and process, easily cause environmental pollution;
(3) adopt ammonia easily the escaping of ammonia to occur as after reducing agent, because catalyst can be oxidized generation sulfur trioxide, stick on heating surface with ammonia react;
(4) denitration reaction needs to use amino reductive, and operating cost is high, have potential safety problem, and amino reductive inherently needs to consume a large amount of energy in process of production, also there is pollution to environment.
Utility model content
In order to solve above-mentioned prior art Problems existing, the purpose of this utility model is the new coal powder boiler providing a kind of ultralow discharged nitrous oxides, structure is simple, stable, denitration reaction can be completed without the need to using amino reductive, denitration efficiency is high, do not increase operating cost, can be used for the transformation of existing pulverized-coal fired boiler, also can be used for the design of newly-built pulverized-coal fired boiler.
In order to achieve the above object, the utility model adopts following technical scheme:
A new coal powder boiler for ultralow discharged nitrous oxides, comprises burner hearth 1, boiler-burner 2 and is arranged on water wall surface 3, curtain wall 4 and the convection heating surface 5 in burner hearth 1;
Described boiler-burner 2 is the boiler-burner with reducing agent generating means, can generate reducing agent CO;
Described boiler-burner 2 comprises low NO LNB and burnout degree OFA;
The metal oxide on described water wall surface 3, curtain wall 4 and convection heating surface 5 surface, through activation process, has good catalytic performance, can promote CO and the O in flue gas
2there is oxidation reaction and generate CO
2, thus recovery chemistry not exclusively loses q
3, improve boiler thermal output and make CO emission control in allowed band; Promote that reduction reaction occurs NO and the CO etc. in flue gas simultaneously;
For unburnable coal, be strengthen denitration reaction efficiency, attached catalyst layer A be set along on the water wall surface 3 in flue gas flow direction, curtain wall 4 and convection heating surface 5 or individual catalyst layer B is set at back-end ductwork;
In described boiler exhaust gas, oxygen concentration is 0 ~ 4.5%, and therefore comparatively conventional pulverized-coal boiler is low for heat loss due to exhaust gas, and boiler exhaust gas heat loss is 1% ~ 4%.
The method of the mol ratio of described burnout degree OFA adjustment reducing agent CO and NO is: increasing burnout degree OFA is one hot blast sent into separately being positioned at low NO LNB top, the total blast volume increasing burnout degree OFA can reduce the mol ratio of reducing agent CO and NO, and the total blast volume reducing burnout degree OFA can increase the mol ratio of reducing agent CO and NO.
The mol ratio of described reducing agent CO and NO is (0.5 ~ 6): 1.
The reducing agent CO concentration that described boiler-burner 2 generates is 100 ~ 1000ppm, and the excess air coefficient in boiler-burner 2 region is 0.5 ~ 0.8, and it is 1.0 ~ 1.2 that burner hearth 1 exports excess air coefficient.
The surface temperature of described attached catalyst layer A and individual catalyst layer B is 200 DEG C ~ 1000 DEG C.
Described attached catalyst layer A and individual catalyst layer B is the multiple mixture of iron, copper, nickel, manganese, cobalt, titanium, aluminium or rare earth metal and oxide thereof, different according to the change of reaction temperature and position.
Described attached catalyst layer A is attached to whole outer surface or the partial outer face of water wall surface 3 in stove, curtain wall 4 and convection heating surface 5.
Described attached catalyst layer A adopts spraying, deposition or built-up welding mode to adhere to, and adhesion layer thickness is 0.1 ~ 5mm.
Described individual catalyst layer B adopts board-like catalysis or honeycomb catalyst, arranges one or more layers.
Core content of the present utility model is by the adjustment to hearth combustion operating mode, namely utilize low NO LNB degree of depth air classification to reduce the original growing amount of NO, burnout degree OFA is utilized to regulate the mol ratio of reducing agent CO and NO, reduction reaction is impelled to occur, ensureing that the denitration efficiency close with ammonia-method denitration technology simultaneously, significantly reducing denitrification apparatus cost and denitration cost.
Compared to the prior art comparatively, the utility model possesses following advantage:
1, adopt the mode such as deeply staged combustion, realize lower nitrogen discharged in burner hearth, reduce the flue gas NOx concentration generated.
2, CO is adopted to substitute NH
3as denitrification reducing agent, avoid the potential safety hazard in ammonia source, system is simple, and CO is that combustion product, operating cost are cheap.
3, adopt during attached catalyst layer mode and individual catalyst bed can not be set, significantly reduce burner hearth improvement cost, the furnace cavity that efficiency utilization is limited.
4, catalyst adopts cheap metal and oxide thereof, significantly reduces catalyst cost.
5, catalyst does not comprise heavy metal, without handling problems after discarded.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram of example 1 of the present utility model.
Fig. 2 is the layout schematic diagram of example 2 of the present utility model.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
Embodiment 1
The new coal powder boiler of ultralow discharged nitrous oxides as shown in Figure 1, comprises burner hearth 1, with the boiler-burner 2 of reducing agent generating means and the water wall surface 3, curtain wall 4 and the convection heating surface 5 that are arranged in burner hearth 1.Low NO LNB degree of depth air classification is utilized during boiler operatiopn, burning excess air coefficient is the original growing amount of 0.6, NO is 120ppm, utilizes burnout degree OFA to regulate the mol ratio of CO and NO to be 2.5, it is 300ppm that CO generates concentration, combustion zone temperature 1100 DEG C.For improving denitration reaction efficiency, on curtain wall 4, deposition attached to the attached catalyst layer A of 1mm thickness, and the surface temperature of curtain wall 4 is 750 DEG C, and the Main Ingredients and Appearance of attached catalyst layer is Fe
2o
3and CuO.After denitration reaction, NO concentration of emission is reduced to 20ppm, denitration efficiency 83%.
Embodiment 2
The new coal powder boiler of ultralow discharged nitrous oxides as shown in Figure 2, be provided with independently individual catalyst layer B for improving denitration efficiency, individual catalyst layer B adopts honeycomb catalyst, and arrange 1 layer, the Main Ingredients and Appearance of attached catalyst layer is Fe
2o
3with the oxide of rare earth element.After denitration reaction, NO concentration of emission is reduced to 10ppm, and denitration efficiency is increased to 92%.
Embodiment 3
The new coal powder boiler of the ultralow discharged nitrous oxides of the present embodiment, low NO LNB burning excess air coefficient is the original growing amount of 0.8, NO is 200ppm, utilizes burnout degree OFA to regulate the mol ratio of CO and NO to be 3, it is 600ppm that corresponding CO generates concentration, combustion zone temperature 1200 DEG C.Curtain wall 4 and convection heating surface 5 adopt deposition attached to the attached catalyst layer A of 1.5mm thickness, the surface temperature of curtain wall 4 is 800 DEG C, and the surface temperature of convection heating surface 5 is 600 DEG C, and the Main Ingredients and Appearance of attached catalyst layer is Fe
2o
3and CuO.After denitration reaction, NO concentration of emission is reduced to 50ppm, denitration efficiency 75%.
Embodiment 4
The new coal powder boiler of the ultralow discharged nitrous oxides of the present embodiment, the original growing amount of NO is the mol ratio of 100ppm, CO and NO is 2, and it is 200ppm that corresponding CO generates concentration.Convection heating surface 5 adopt spraying attached to the attached catalyst layer A of 0.5mm thickness.After denitration reaction, NO concentration of emission is reduced to 40ppm, denitration efficiency 60%.
Embodiment 5
The new coal powder boiler of the ultralow discharged nitrous oxides of the present embodiment, coat the attached catalyst layer A of 0.5mm at curtain wall 4, its main component is Fe
2o
3and CuO.Convection heating surface 5 coats the attached catalyst layer A of 1mm, and its main component is Fe
2o
3and Ni.
Claims (7)
1. a new coal powder boiler for ultralow discharged nitrous oxides, comprises burner hearth (1), boiler-burner (2) and is arranged on water wall surface (3), curtain wall (4) and the convection heating surface (5) in burner hearth (1);
It is characterized in that: described boiler-burner (2) is the boiler-burner with reducing agent generating means, can generate reducing agent CO;
Described boiler-burner (2) comprises low NO LNB and burnout degree OFA;
The metal oxide on described water wall surface (3), curtain wall (4) and convection heating surface (5) surface is through activation process;
For unburnable coal, for strengthening denitration reaction efficiency, attached catalyst layer (A) being set along on the water wall surface (3) in flue gas flow direction, curtain wall (4) and convection heating surface (5) or individual catalyst layer (B) is set at back-end ductwork;
In described boiler exhaust gas, oxygen concentration is 0 ~ 4.5%.
2. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, is characterized in that: the mol ratio of described reducing agent CO and NO is (0.5 ~ 6): 1.
3. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, it is characterized in that: the reducing agent CO concentration that described boiler-burner (2) generates is 100 ~ 1000ppm, the excess air coefficient in boiler-burner (2) region is 0.5 ~ 0.8, and burner hearth (1) outlet excess air coefficient is 1.0 ~ 1.2.
4. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, is characterized in that: the surface temperature of described attached catalyst layer (A) and individual catalyst layer (B) is 200 DEG C ~ 1000 DEG C.
5. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, is characterized in that: described attached catalyst layer (A) is attached to whole outer surface or the partial outer face of water wall surface in stove (3), curtain wall (4) and convection heating surface (5).
6. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, is characterized in that: described attached catalyst layer (A) adopts spraying, deposition or built-up welding mode to adhere to, and adhesion layer thickness is 0.1 ~ 5mm.
7. the new coal powder boiler of a kind of ultralow discharged nitrous oxides according to claim 1, is characterized in that: described individual catalyst layer (B) adopts board-like catalysis or honeycomb catalyst, arranges one or more layers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520429597.1U CN204962730U (en) | 2015-06-19 | 2015-06-19 | Novel pulverized coal boiler that ultralow nitrogen oxide discharged |
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|---|---|---|---|
| CN201520429597.1U CN204962730U (en) | 2015-06-19 | 2015-06-19 | Novel pulverized coal boiler that ultralow nitrogen oxide discharged |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439794A (en) * | 2016-09-30 | 2017-02-22 | 浙江浙能技术研究院有限公司 | Air distribution method and system reducing NOX emission and relieving coking |
| CN111947179A (en) * | 2020-09-16 | 2020-11-17 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion method and low-nitrogen combustion equipment |
-
2015
- 2015-06-19 CN CN201520429597.1U patent/CN204962730U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439794A (en) * | 2016-09-30 | 2017-02-22 | 浙江浙能技术研究院有限公司 | Air distribution method and system reducing NOX emission and relieving coking |
| CN111947179A (en) * | 2020-09-16 | 2020-11-17 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion method and low-nitrogen combustion equipment |
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