CN105749740A - Alkali recovery boiler low-temperature denitration system and process - Google Patents
Alkali recovery boiler low-temperature denitration system and process Download PDFInfo
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- CN105749740A CN105749740A CN201610271078.6A CN201610271078A CN105749740A CN 105749740 A CN105749740 A CN 105749740A CN 201610271078 A CN201610271078 A CN 201610271078A CN 105749740 A CN105749740 A CN 105749740A
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- Prior art keywords
- recovery boiler
- alkali recovery
- temperature
- heat exchanger
- low
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
Abstract
The invention relates to the technical field of alkali recovery boiler flue gas treatment, in particular to an alkali recovery boiler low-temperature denitration system and process.The system comprises an alkali recovery boiler, a heater, an electrostatic dust collection device, a low-temperature denitration device, a waste heat recovery device and a water feeding and storing device.The heater is arranged to heat water provided for the alkali recovery boiler so as to increase the temperature of flue gas to be close to catalytic reaction temperature, so that catalysis denitration reaction is more sufficient and NOx removal efficiency is improved.
Description
Technical field
The present invention relates to alkali recovery boiler fume treatment technical field, be specifically related to a kind of alkali recovery boiler low-temperature denitrifying system and technique.
Background technology
Along with socioeconomic fast development, environmental problem becomes increasingly conspicuous, and oxysulfide, nitrogen oxides are main atmosphere pollutions, has severely compromised the healthy of ecological environment and people.All there is serious haze weather in all parts of the country the most in recent years, have impact on our daily life, power plant is the most all the main rich and influential family of air pollution emission, and country has formulated detailed discharge standard also for power plant, and current power plant emission requires as SO2≤100mg/Nm3, NOx≤100mg/Nm3, dust≤30mg/Nm3.Conventional scr catalyst ripe in the market uses temperature to be 320 DEG C ~ 400 DEG C, it is usually placed between coal-powder boiler economizer exit and air preheater import, owing to some layout of boiler is compact, it is likely not to have the conventional SCR catalyst of enough space mounting and reactor, therefore started domestic and international each colleges and universities from 2010 and a lot of enterprise begins one's study low temperature catalyst technology, low-temperature SCR catalyst has run case at present, and domestic technique is the most overripened.
Alkali recovery boiler is due to its structural particularity, can only be at ESP(electrostatic precipitation) process followed by denitration, alkali recovery boiler temperature after ESP is generally about 170 DEG C, and the use temperature of low-temperature SCR catalyst at present >=200 DEG C, consider sodium, the effect of potassium ion in sode ash, for the use temperature of low-temperature SCR catalyst of alkali recovery boiler probably between 220 ~ 250 DEG C, this temperature is much larger than alkali recovery boiler exhaust gas temperature
Conventional SCR denitration is arranged between coal-powder boiler economizer exit and air preheater import, by flue, flue gas is introduced in SCR reactor, flue gas after processing with flue again after denitration processes introduces air preheater, SCR reactor can not be arranged the most remote, otherwise the oversize meeting of flue causes cost of investment to increase, and additionally long-distance transportation heat loss can be bigger, it is possible to temperature is less than the use temperature of SCR catalyst, thus reduce catalyst efficiency, cause NOx emission to exceed standard.And boiler tail structure is the most compact, denitration space do not reserved by boiler particularly in early days, possibly cannot arrange enough SCR reactors.
In consideration of it, overcome above defect of the prior art, it is provided that a kind of new alkali recovery boiler low-temperature denitrifying system and technique become the technical problem that this area is urgently to be resolved hurrily.
Summary of the invention
Present invention aims to the drawbacks described above of prior art, it is provided that a kind of alkali recovery boiler low-temperature denitrifying system and technique.
The purpose of the present invention can be realized by following technical measures:
A kind of alkali recovery boiler low-temperature denitrifying system, compared with prior art, its difference is, this system includes:
Alkali recovery boiler；
It is connected with alkali recovery boiler, for improving the heater of alkali recovery boiler feed temperature；
Low-temperature denitration device, processes for alkali recovery boiler is discharged and formed the flue gas of vertical downward flow, and the out of stock device of this low temperature is provided with at least one of which catalyst module, and described catalyst module is assembled with multiple catalyst elements；And
Waste-heat recovery device, for carrying out waste heat recovery to the flue gas after low-temperature denitration device catalytic treatment.
Preferably, between described alkali recovery boiler and described low-temperature denitration device, it is additionally provided with electrostatic precipitator, carries out electrostatic precipitation for alkali recovery boiler is discharged flue gas.
Preferably, this system also includes the feedwater storage device being connected with described heater, is used for storing alkali recovery boiler feedwater.
Preferably, described waste-heat recovery device includes:
First Heat Exchanger, including heat exchanger shell, extends vertically through the first heat exchanger tube that described housing is arranged and the first flue being laid in around described first heat exchanger tube；
Second heat exchanger, including the second heat exchanger tube being placed in described second heat exchanger heat exchanging chamber and be placed in heat exchanging chamber add heat pipe, the water inlet pipe of described second heat exchanger tube and outlet pipe be connected with the first heat exchanger tube of described First Heat Exchanger formation one closed circuit；
Feed water from described second heat exchanger add heat pipe in pass through, after preheating enter feedwater storage device in store for future use.
Preferably, the second heat exchanger tube of described second heat exchanger extends vertically through the housing setting of the second heat exchanger.
Present invention also offers a kind of alkali recovery boiler low-temperature denitration technique, this technique first passes through heating alkali recovery boiler and feeds water to improve alkali recovery boiler flue-gas temperature；Then alkali recovery boiler flue gas formation vertical downward flow contacts with catalyst；Finally the flue gas after catalysis is carried out waste heat recovery.
Preferably, before described catalytic reaction, alkali recovery boiler flue gas is carried out electrostatic precipitation.
Preferably, the heated rear temperature of described feedwater is more than or equal to 160 DEG C, and described alkali recovery boiler flue-gas temperature is 220～250 DEG C.
Preferably, catalytic reaction temperature is 220～450 DEG C.
Preferably, with the waste heat of the flue gas after the catalysis being recovered to, alkali recovery boiler feedwater is preheated.
The denitrating system of the present invention is provided with heater and the feedwater of alkali recovery boiler heats to improve the temperature of flue gas to close to catalytic reaction temperature so that catalytic denitration reaction is more abundant, improves NOx removal efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the denitrating system of the present invention.
Fig. 2 is the internal Local map of low-temperature denitration device of the denitrating system of the present invention.
Fig. 3 is the waste-heat recovery device structural representation of the denitrating system of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, with specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Hereinafter, many aspects of the present invention will be more fully understood that with reference to accompanying drawing.Parts in accompanying drawing are not necessarily drawn to scale.Alternatively, it is preferred that emphasis is clearly demonstrate the parts of the present invention.Additionally, in some views in the accompanying drawings, identical reference indicates corresponding part.
" exemplary " or " illustrative " represents as example, example or explanation as used herein, the word.Any embodiment being described herein as " exemplary " or " illustrative " is not necessarily to be construed as relative to other embodiment being preferred or favourable.All embodiments described below are illustrative embodiments, thering is provided these illustrative embodiments is that the scope of the present disclosure is defined by the claims so that those skilled in the art make and use embodiment of the disclosure and expect and be not limiting as the scope of the present disclosure.In other embodiments, describe in detail known to feature and method not obscure the present invention.For purpose described herein, term " on ", D score, "left", "right", "front", "rear", " vertically ", " level " with its derivative words by relevant with the invention that such as Fig. 1 orients.And, have no intent to be limited by any theory expressed or imply be given in technical field above, background technology, summary of the invention or detailed description below.Should also be clear that the concrete device described in shown in the drawings and discussion below book and process are the simple examples embodiments of the inventive concept limited in the following claims.Therefore, the concrete size relevant to presently disclosed embodiment and other physical features are understood not to restrictive, unless claims are stated the most clearly.
Fig. 1 shows a kind of alkali recovery boiler low-temperature denitrifying system 100, and this system 100 includes: alkali recovery boiler 10, heater 20, electrostatic precipitator 30, low-temperature denitration device 40, waste-heat recovery device 50 and feedwater storage device 60.
Wherein, heater 20 is connected with alkali recovery boiler 10, is used for improving alkali recovery boiler feed temperature；Feedwater storage device 60 is used for storing alkali recovery boiler feedwater；The feedwater being stored in feedwater storage device 60 first passes through the heating of heater 20, and temperature reaches more than 160 DEG C, enters back in alkali recovery boiler 10.Electrostatic precipitator 30 is located between alkali recovery boiler 10 and low-temperature denitration device 40, carries out electrostatic precipitation for alkali recovery boiler 10 is discharged flue gas.Low-temperature denitration device 40 carries out catalytic denitration for the flue gas discharging alkali recovery boiler 10, refer to shown in Fig. 2, the out of stock device of low temperature 40 is provided with at least one of which catalyst module 401, catalyst module 401 is assembled with multiple catalyst elements 40a, primary active material V2O5 and WO3 is evenly distributed in catalyst elements 40a by steel construction, catalyst module 401 can arrange bilayer or multilamellar vertically upward, flue gas through electrostatic precipitation forms vertical downward flow and sequentially passes through each layer catalyst module 401, at 220 DEG C ~ 450 DEG C, following reaction is occurred to carry out denitration:
NO2 + NO +
2NH3 ⇒ 2N2 + 3H2O
4NO + 4NH3 +
O2 ⇒ 4N2 + 6H2O
2NO2 + 4NH3
+ O2 ⇒ 3N2 + 6H2O。
Owing to the temperature of the flue gas of alkali recovery boiler 10 discharge improves, this system 100 is provided with waste-heat recovery device 50, for the flue gas after low-temperature denitration device 40 catalytic treatment is carried out waste heat recovery.
Waste-heat recovery device 50 includes First Heat Exchanger 501 and the second heat exchanger 502, refer to shown in Fig. 3, First Heat Exchanger 501 includes heat exchanger shell the 5011, first heat exchanger tube 5012 and the first flue (not shown), first heat exchanger tube 5012 extends vertically through heat exchanger shell 5011 and arranges, and the first flue (not shown) is laid in around the first heat exchanger tube 5012.Second heat exchanger 502 includes the second heat exchanger tube 5021 and adds heat pipe 5022, second heat exchanger tube 5021 is placed in described second heat exchanger 502 heat exchanging chamber, adding heat pipe 5022 to be also placed in heat exchanging chamber, the first heat exchanger tube 5012 of the described First Heat Exchanger 501 of described second heat exchanger tube 5021 connects formation one closed circuit.Feed water from described second heat exchanger 502 add heat pipe 5022 in pass through, after preheating enter feedwater storage device 60 in store for future use.In a preferred embodiment, the second heat exchanger tube 5021 of described second heat exchanger 502 extends vertically through the housing of the second heat exchanger 502 and arranges, and adds heat pipe 5022 and arranges around the second heat exchanger tube 5021.Flue gas after catalytic reaction enters in the first flue (not shown) of First Heat Exchanger 501, and the closed circuit that its heat is formed by the first heat exchanger tube 5012 and the second heat exchanger tube 5021 passes to add the feedwater in heat pipe 5022, for feed-water preheating.
The embodiment of the present invention additionally provides a kind of alkali recovery boiler low-temperature denitration technique, first passes through heating alkali recovery boiler and feeds water to improve alkali recovery boiler flue-gas temperature；Then alkali recovery boiler flue gas formation vertical downward flow contacts with catalyst；Finally the flue gas after catalysis is carried out waste heat recovery.
In above-mentioned technique, before catalytic reaction, alkali recovery boiler flue gas is carried out electrostatic precipitation.The heated rear temperature of described feedwater is more than or equal to 160 DEG C, and described alkali recovery boiler flue-gas temperature is 220～250 DEG C.Catalytic reaction temperature is 220～450 DEG C.
Further, it is also possible to the waste heat of the flue gas after the catalysis being recovered to, alkali recovery boiler feedwater is preheated.
Specifically, the technique of the present invention first determines the minimum use temperature of low-temperature SCR catalyst according to smoke components, then alkali recovery boiler exhaust gas temperature is determined, determine that alkali recovery boiler feed temperature and confluent promote by thermodynamic computing, it is ensured that boiler overheating steam temperature and pressure is constant.Said system 100 is utilized to implement this technique, first, improve boiler feed temperature: before the economizer entrance of alkali recovery boiler 10, increase heater 20, heater 20 is one or two shell-and-tube heat exchangers, for improving alkali recovery boiler feed temperature, the number of units of shell-and-tube heat exchanger and heating source depend on boiler thermodynamic calculation result, if temperature is promoted to about 160 DEG C, middle pressure steam is used to heat, if temperature is promoted to more than 160 DEG C, need to use high steam or superheated steam to heat.By improving alkali recovery boiler feed temperature, the temperature (220 DEG C ~ 250 DEG C) that boiler tail exhaust gas temperature extremely needs can be effectively improved, transform without the need for boiler.Subsequently, smoke catalytic denitration is carried out.After improving feed temperature, exhaust gas temperature improves to 220 DEG C ~ about 250 DEG C, the directly discharge of flue gas after catalytic denitration can cause thermal loss, therefore the present invention installs flue gas waste heat recovery apparatus additional after low-temperature SCR reactor, in order to the heat in recovered flue gas, the heat reclaimed is generally used for heating feedwater, such that it is able to reduce the consumption of oxygen-eliminating device low pressure steam.Flue gas waste heat recovery apparatus generally uses low-level (stack-gas) economizer or heat pipe to be placed in flue, and again by plate type heat exchanger heating feedwater after factory's water is heated, the factory's water after cooling is re-introduced into circulating-heating in heat pipe or low-level (stack-gas) economizer.Flue-gas temperature after flue gas waste heat recovery can be reduced to about 120 DEG C (depending on acid leak sources), and NOx content controls directly to discharge through chimney at 100mg/Nm3.
Boiler tail cigarette temperature can be promoted by this process system, makes boiler tail cigarette temperature and low-temperature SCR catalyst use Temperature Matching, thus reaches to remove NOx purpose, and native system removing NOx efficiency can reach 90%, it can be ensured that discharge NOx≤100mg/Nm3。
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. an alkali recovery boiler low-temperature denitrifying system, it is characterised in that this system includes:
Alkali recovery boiler；
It is connected with alkali recovery boiler, for improving the heater of alkali recovery boiler feed temperature；
Low-temperature denitration device, processes for alkali recovery boiler is discharged and formed the flue gas of vertical downward flow, and the out of stock device of this low temperature is provided with at least one of which catalyst module, and described catalyst module is assembled with multiple catalyst elements；And
Waste-heat recovery device, for carrying out waste heat recovery to the flue gas after low-temperature denitration device catalytic treatment.
Alkali recovery boiler low-temperature denitrifying system the most according to claim 1, it is characterised in that be additionally provided with electrostatic precipitator between described alkali recovery boiler and described low-temperature denitration device, carries out electrostatic precipitation for alkali recovery boiler is discharged flue gas.
Alkali recovery boiler low-temperature denitrifying system the most according to claim 1, it is characterised in that this system also includes the feedwater storage device being connected with described heater, is used for storing alkali recovery boiler feedwater.
Alkali recovery boiler low-temperature denitrifying system the most according to claim 3, it is characterised in that described waste-heat recovery device includes:
First Heat Exchanger, including heat exchanger shell, extends vertically through the first heat exchanger tube that described housing is arranged and the first flue being laid in around described first heat exchanger tube；
Second heat exchanger, including the second heat exchanger tube being placed in described second heat exchanger heat exchanging chamber and be placed in heat exchanging chamber add heat pipe, the water inlet pipe of described second heat exchanger tube and outlet pipe be connected with the first heat exchanger tube of described First Heat Exchanger formation one closed circuit；
Feed water from described second heat exchanger add heat pipe in pass through, after preheating enter feedwater storage device in store for future use.
Alkali recovery boiler low-temperature denitrifying system the most according to claim 4, it is characterised in that the second heat exchanger tube of described second heat exchanger extends vertically through the housing of the second heat exchanger and arranges.
6. an alkali recovery boiler low-temperature denitration technique, it is characterised in that this technique first passes through heating alkali recovery boiler and feeds water to improve alkali recovery boiler flue-gas temperature；Then alkali recovery boiler flue gas formation vertical downward flow contacts with catalyst；Finally the flue gas after catalysis is carried out waste heat recovery.
Alkali recovery boiler low-temperature denitration technique the most according to claim 6, it is characterised in that before described catalytic reaction, alkali recovery boiler flue gas is carried out electrostatic precipitation.
Alkali recovery boiler low-temperature denitration technique the most according to claim 6, it is characterised in that the heated rear temperature of described feedwater is more than or equal to 160 DEG C, and described alkali recovery boiler flue-gas temperature is 220～250 DEG C.
Alkali recovery boiler low-temperature denitration technique the most according to claim 6, it is characterised in that catalytic reaction temperature is 220～450 DEG C.
Alkali recovery boiler low-temperature denitration technique the most according to claim 6, it is characterised in that alkali recovery boiler feedwater is preheated with the waste heat of the flue gas after the catalysis being recovered to.
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| CN205066479U (en) * | 2015-09-21 | 2016-03-02 | 武汉凯比思电力设备有限公司 | Soda recovery furnace residual heat from flue gas device |
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2016
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489109A (en) * | 2011-12-09 | 2012-06-13 | 中电投远达环保工程有限公司 | Dry-type efficient and energy saving system for cleaning flue gas of multi-pollutants |
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