CN204438065U - For the denitration in the stove waste heat boiler of catalytic unit - Google Patents
For the denitration in the stove waste heat boiler of catalytic unit Download PDFInfo
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- CN204438065U CN204438065U CN201520011660.XU CN201520011660U CN204438065U CN 204438065 U CN204438065 U CN 204438065U CN 201520011660 U CN201520011660 U CN 201520011660U CN 204438065 U CN204438065 U CN 204438065U
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Abstract
The utility model discloses a kind of denitration in the stove waste heat boiler for catalytic unit, comprise front furnace body, rear furnace body and top flue, one end of this top flue is communicated with the upper end of front furnace body, and the other end of this top flue is communicated with the upper end of rear furnace body; The lower end of front furnace body is provided with gas approach, and the lower end of rear furnace body is provided with exhanst gas outlet; Its feature is, in front furnace body, is provided with burner and superheater successively from the bottom to top; In rear furnace body, be provided with the first economizer, the second economizer, denitration module, the first evaporimeter, spray ammonia assembly and the second evaporimeter from the bottom to top successively.Carbon monoxide in the flue gas of catalytic unit can eliminate by the utility model, and compact conformation, denitration efficiency is high.
Description
Technical field
The utility model relates to boiler technology, particularly relates to the denitration in the stove waste heat boiler for petroleum chemical enterprise's catalytic unit.
Background technology
Waste heat boiler is the capital equipment of waste heat recovery in petroleum chemical enterprise's catalytic cracking unit.Amount of nitrogen oxides in catalytic cracking unit flue gas is higher, and does not have setting to remove the measure of nitrogen oxide (abbreviation denitration) in waste heat boiler in the past, and flue gas enters in air will produce environmental pollution.Along with the increasingly stringent of national requirements for environmental protection, in order to reach discharged nitrous oxides index, denitration device must be set up.But catalytic unit waste heat boiler is different from conventional waste heat boiler, usually containing carbon monoxide in the flue gas that catalytic unit comes, it is toxic gas, therefore must first by the carbon monoxide removal in flue gas.In addition, catalytic unit waste heat boiler is also different from fuel oil or coal-burning boiler, the catalyst dust particle diameter carried in its flue gas is very little, and have stronger adhesiveness, if the ammonia sprayed into during denitration mixes uneven with flue gas, then part ammonia would not with the reaction of nitrogen oxides (being called the escape of ammonia) in flue gas, but with the SO in flue gas
2and SO
3generate liquid ammonium bisulfite or ammonium hydrogen sulfate, and catalyst dust is bonded on boiler heating surface, affect heat-transfer effect, and increase flue gas resistance.Therefore, be necessary to design a kind of waste heat boiler being applicable to the denitration in the stove of catalytic unit smoke characteristic.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of waste heat boiler adapting to the denitration in the stove of catalytic unit smoke characteristic, and the carbon monoxide in the flue gas of catalytic unit can eliminate by it, and compact conformation, denitration efficiency is high.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
For a denitration in the stove waste heat boiler for catalytic unit, comprise front furnace body, rear furnace body and top flue, one end of this top flue is communicated with the upper end of front furnace body, and the other end of this top flue is communicated with the upper end of rear furnace body; The lower end of front furnace body is provided with gas approach, and the lower end of rear furnace body is provided with exhanst gas outlet; Its feature is, in front furnace body, is provided with burner and superheater successively from the bottom to top; In rear furnace body, be provided with the first economizer, the second economizer, denitration module, the first evaporimeter, spray ammonia assembly and the second evaporimeter from the bottom to top successively.
The above-mentioned denitration in the stove waste heat boiler for catalytic unit, wherein, is provided with rake soot blower and acoustic wave ash ejector in denitration module.
The above-mentioned denitration in the stove waste heat boiler for catalytic unit, wherein, in front furnace body, is also provided with water conservation device between burner and superheater.
Because the utility model have employed above technical scheme, following beneficial effect can be reached:
1, burner is provided with in waste heat boiler of the present utility model, can by the complete after-flame of carbon monoxide in the flue gas of catalytic unit, nontoxic discharge; Meanwhile, adopt low nitrogen burning, control newly-generated amount of nitrogen oxides, better denitration environment protecting can be ensured;
2, denitration module arrangement of the present utility model is in stove, and design with waste heat boiler integrated, integral arrangement is compact, and structure is simple, and floor space is little;
3, ammonia mixes with flue gas, and the escapement ratio of ammonia is low, and denitration effect is good, and the not long-pending bonding ash of boiler, heat transfer efficiency is high, and flue gas resistance is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the denitration in the stove waste heat boiler for catalytic unit according to the utility model one embodiment.
Detailed description of the invention
Below in conjunction with accompanying drawing the utility model made and describing in further detail.
Please refer to Fig. 1.According to a kind of denitration in the stove waste heat boiler for catalytic unit of the utility model one embodiment, comprise front furnace body 11, rear furnace body 12 and top flue 13, one end of top flue 13 is communicated with the upper end of front furnace body 11, and the other end of top flue 13 is communicated with the upper end of rear furnace body.Drum 14 is provided with at the top of top flue 13.Have deflector 17 in top flue 13 internal placement, the flue gas flow field that turning is entered in waste heat boiler rear furnace body is even.The lower end of front furnace body 11 is provided with gas approach 15, and the lower end of rear furnace body 12 is provided with exhanst gas outlet 16.
In front furnace body 11, be provided with burner 2, water conservation device 3 and superheater 4 from the bottom to top successively.The quantity of burner 2 can be one or more.The effect of burner is lighted by carbon monoxide poisonous in flue gas, and ignition temperature controls between 800 DEG C to 900 DEG C, by thorough for carbon monoxide after-flame; In combustion the amount of newly-generated nitrogen oxide is controlled at reduced levels (<100mg/Nm simultaneously
3), avoid bringing larger burden to denitration below.This burner 2 preferably adopts low NO (or to claim low NO
xburner).The effect of water conservation device 3 absorbs flue gas heat, reduces flue-gas temperature, avoid high-temperature flue gas to be burnt out by superheater 4.Water conservation device 3, depending on the situation of flue gas composition, if flue-gas temperature is not too high, also can not arrange water conservation device 3.
In rear furnace body, be provided with the first economizer 51, second economizer 52, denitration module 6, first evaporimeter 71, spray ammonia assembly 8 and the second evaporimeter 72 from the bottom to top successively.Spray ammonia assembly 8 sprays ammonia, after the first evaporimeter 71, enter denitration module 6 again.The effect of the second evaporimeter 72 absorbs flue gas heat to produce saturated vapor.The effect of the first evaporimeter 71 absorbs flue gas heat to produce steam, also has the effect of current-sharing grid herein, ammonia is mixed equably with flue gas.Denitration module 6 is built with denitrating catalyst, and the nitrogen oxide in flue gas and ammonia chemical reduction reaction can occur through catalyst, is nitrogen by most of the nitrogen Reduction of Oxide.Owing to containing more ash content in flue gas, if ash content pollutes catalyst, not only can denitration effect be reduced, and the space of meeting blocking catalyst, increase flue gas resistance.Therefore, in denitration module 6, be preferably furnished with rake soot blower 91 and acoustic wave ash ejector 92, ash is blown in timing, keeps the unobstructed of the clean of catalyst surface and runner.The heat of the first economizer 51 and the second economizer 52 Absorbable rod flue gas, heats water.
Aforesaid burner 2, superheater 4, first economizer 51, second economizer 52, first evaporimeter 71, spray ammonia assembly 8 and the second evaporimeter 72 are modular apparatus, can manufacture in advance, thus reduce on-site installation work amount in factory.
Be furnished with deflector 18 in body of heater between denitration module 6 and the second economizer 52, make from denitration module 6 flue gas flow field out even.
The flue gas of catalytic unit is all malleation, so the exterior panel of each parts of the utility model waste heat boiler is all strengthened, the flue gas pressures that can bear is greater than 10000Pa(gauge pressure), waste heat boiler is according to malleation design, operation and run.
After adopting technique scheme, the utility model is by complete for the carbon monoxide in the flue gas of catalytic unit after-flame, and nontoxic discharge, adopts low nitrogen burning simultaneously, controls newly-generated amount of nitrogen oxides, can ensure better denitration environment protecting; Denitration module 6 is arranged in stove, and design with waste heat boiler integrated, integral arrangement is compact, and structure is simple, and floor space is little; Ammonia mixes with flue gas, and the escapement ratio of ammonia is low, and denitration effect is good, and the not long-pending bonding ash of boiler, heat transfer efficiency is high, and flue gas resistance is low.
Claims (8)
1., for a denitration in the stove waste heat boiler for catalytic unit, comprise front furnace body, rear furnace body and top flue, one end of this top flue is communicated with the upper end of front furnace body, and the other end of this top flue is communicated with the upper end of rear furnace body; The lower end of front furnace body is provided with gas approach, and the lower end of rear furnace body is provided with exhanst gas outlet; It is characterized in that, in described front furnace body, be provided with burner and superheater successively from the bottom to top; In described rear furnace body, be provided with the first economizer, the second economizer, denitration module, the first evaporimeter, spray ammonia assembly and the second evaporimeter from the bottom to top successively.
2., as claimed in claim 1 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, described burner is low NO.
3. as claimed in claim 1 or 2 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, described burner, superheater, the first economizer, the second economizer, the first evaporimeter, spray ammonia assembly and the second evaporimeter are modular apparatus.
4., as claimed in claim 1 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, in described top flue, be furnished with deflector.
5., as claimed in claim 1 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, in the body of heater between described denitration module and the second economizer, be furnished with deflector.
6., as claimed in claim 1 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, described denitration module is built with denitrating catalyst.
7. the denitration in the stove waste heat boiler for catalytic unit as described in claim 1 or 6, is characterized in that, is provided with rake soot blower and acoustic wave ash ejector in described denitration module.
8., as claimed in claim 1 for the denitration in the stove waste heat boiler of catalytic unit, it is characterized in that, in described front furnace body, between burner and superheater, be also provided with water conservation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520011660.XU CN204438065U (en) | 2015-01-08 | 2015-01-08 | For the denitration in the stove waste heat boiler of catalytic unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520011660.XU CN204438065U (en) | 2015-01-08 | 2015-01-08 | For the denitration in the stove waste heat boiler of catalytic unit |
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| CN204438065U true CN204438065U (en) | 2015-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393211A (en) * | 2020-11-05 | 2021-02-23 | 苏州海陆重工股份有限公司 | Novel CO incineration boiler |
-
2015
- 2015-01-08 CN CN201520011660.XU patent/CN204438065U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393211A (en) * | 2020-11-05 | 2021-02-23 | 苏州海陆重工股份有限公司 | Novel CO incineration boiler |
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