CN105749738A - Denitration system and process of low-temperature industrial waste gas - Google Patents
Denitration system and process of low-temperature industrial waste gas Download PDFInfo
- Publication number
- CN105749738A CN105749738A CN201610161138.9A CN201610161138A CN105749738A CN 105749738 A CN105749738 A CN 105749738A CN 201610161138 A CN201610161138 A CN 201610161138A CN 105749738 A CN105749738 A CN 105749738A
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- gas
- waste gas
- ammonia
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- temperature
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a denitration system and process of low-temperature industrial waste gas. The system comprises a dilution fan, an ammonia-air mixer, an SCR (selective catalytic reduction) reactor, a waste gas heater and a gas-gas heat exchanger, wherein the dilution fan is connected with the ammonia-air mixer through a pipeline, an ammonia inlet is formed between the dilution fan and the ammonia-air mixer, a blower is connected with the waste gas heater, a combustion inlet and a combuster are arranged between the blower and the waste gas heater, the ammonia-air mixer and the waste gas heater are connected with the SCR reactor through an ammonia spraying grating, the SCR reactor is sequentially connected with the gas-gas heat exchanger, an induced draft fan and an exhaust pipe, one end of the gas-gas heat exchanger is communicated with the low-temperature industrial waste gas, and the other end is connected with the waste gas heater. Through segmented heating, waste heat is sufficiently utilized, the high-temperature waste gas treated by the SCR reactor is used for heating the low-temperature industrial waste gas, energy consumption is reduced, and the problems that the device running rate is low, secondary pollution is caused, the treatment capacity is low, the purification efficiency is lower, the one-time investment is too high and the like are solved.
Description
Technical field
The present invention relates to denitrating system and the technique of a kind of low-temperature industrial waste gas.
Background technology
NOx is very big to the detrimental effect of environment, and along with expanding economy, Environmental Protection Agency strengthens discharged nitrous oxides waste gas total amount
Control, traditional method of denitration is increasingly difficult to the requirement to environmental protection of the satisfied country.In tradition method of denitration, SNCR (choosing
Selecting property non-catalytic reduction) it is main flow, but its denitration efficiency is relatively low, it is difficult to meet the following requirement to NOx emission concentration.Newly
Emerging SCR (SCR) is the cheapest because of its denitration efficiency high (denitration efficiency is up to more than 85%), price
Progress into market.
The low temperature waste gas such as photovoltaic, dyestuff discharge industry present stage typically uses absorption process, absorption method, absorption reducing process, low temperature
The methods such as plasma technique carry out processing NOx, but there is problem miscellaneous, as low in unit service factor, easily cause two
Secondary pollution, treating capacity are little, relatively low to be difficult to meet environmental requirement, one-time investment the most high for purification efficiency.
The industrial gas emission temperature of the industries such as coking, thermoelectricity, steel, more than 200 DEG C, uniformly mixes with gas ammonia reducing agent
After can be directly entered SCR reactor denitration.But for the industry such as photovoltaic, dyestuff, waste gas exhaust temperature is relatively low, it is impossible to meet
The minimum temperature (more than 180 DEG C) that the reaction of middle low-temperature SCR requires.
For the exhaust gas denitration situation of the low temperature waste gas discharge industries such as current photovoltaic, dyestuff, develop a set of new process route
Improve these problems to be necessary in fact.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of technique road reliably for low temperature waste gas discharge industry
Line, the problem overcoming tradition denitration technology, meet national environmental protection new demand.
For achieving the above object, the present invention provides following technical scheme:
A kind of denitrating system of low-temperature industrial waste gas, anti-including dilution air, ammonia-air mixer, ammonia-spraying grid, SCR
Device, combustion heater, aiutage and gas-to-gas heat exchanger, described dilution air and ammonia-air mixer is answered to pass through pipeline
Being connected, the pipeline between described dilution air and ammonia-air mixer is provided with ammonia entrance, described air blast and waste gas
Heater is connected, and is provided with fuel gas inlet and burner, described ammonia-air mixing between described air blast and combustion heater
Device is connected with SCR reactor after ammonia-spraying grid with combustion heater, the outlet of described SCR reactor successively with gas-gas
Heat exchanger, air-introduced machine are connected with aiutage, and low-temperature industrial waste gas is connected in described gas-to-gas heat exchanger one end, and its other end passes through
Pipeline connects combustion heater.
Preferably, system for detecting temperature is set at described SCR reactor inlet, is provided with fuel gas inlet at described fuel gas inlet and adjusts
Joint valve, described system for detecting temperature associates with fuel gas inlet regulation valve.
Preferably, described ammonia porch arranges automatic regulating valve.
Preferably, described gas-to-gas heat exchanger installs bypass between the air inlet and high-temp waste gas outlet pipe of low-temperature industrial waste gas,
This bypass and gas-to-gas heat exchanger high-temp waste gas export, gas-to-gas heat exchanger low temperature waste gas import is respectively provided with a set of electric guard board door
Or butterfly valve.
The denitrating technique process using the low-temperature industrial waste gas of the denitrating system of above-mentioned low-temperature industrial waste gas is as follows:
Heat exchange realization is carried out at gas-to-gas heat exchanger from the low-temperature industrial waste gas in workshop and the high-temp waste gas of SCR reactor outlet
Preliminary heating up, the waste gas after intensification enters combustion heater, combustion gas burn in burner laggard enter combustion heater, utilize
The heat of fuel gas buring release, is heated to SCR reactor requirement minimum temperature by low-temperature industrial waste gas, enters through ammonia-spraying grid
SCR reactor, ammonia brings ammonia-air mixer into by dilution air simultaneously, after mixing, enters through ammonia-spraying grid
SCR reactor, carries out denitration reduction reaction, the NOx in removing waste gas, the waste gas after denitration under catalyst action
Through gas-to-gas heat exchanger, utilize outlet high-temperature tail gas heating from the low-temperature industrial waste gas in workshop, outlet exhaust temperature is dropped
To normal temperature, discharged by aiutage after air-introduced machine guides.
Compared with prior art, the invention has the beneficial effects as follows:
1, the traditional treatment method of NOx in low-temperature industrial waste gas is changed, solving device running rate is low, easily cause secondary pollution,
Treating capacity is little, purification efficiency relatively low is difficult to meet environmental requirement, one-time investment crosses the various problems of high existence.
2, heat stepwise, makes full use of waste heat.The high-temp waste gas after SCR reactor for treatment is utilized to heat low-temperature industrial waste gas,
Greatly reduce energy resource consumption.
3, use " waste heat recovery+gas heating+SCR denitration " process route, make low temperature SCR denitration be not only applicable to Jiao
The industries such as change, thermoelectricity, also have broader practice in photovoltaic, dyestuff low-temperature industrial waste gas discharge industry.
Accompanying drawing explanation
Fig. 1 is the structural representation of the denitrating system of low-temperature industrial waste gas.
In figure, 1-dilution air；2-ammonia-air mixer；3-ammonia-spraying grid；4-SCR reactor；5-combustion heater；
6-burner；7-air blast；8-aiutage；9, air-introduced machine；10-bypasses；11-gas-to-gas heat exchanger
Detailed description of the invention
In the embodiment of the present invention, the denitrating system of a kind of low-temperature industrial waste gas, including dilution air 1, ammonia-air mixer
2, ammonia-spraying grid 3, SCR reactor 4, combustion heater 5, aiutage 8 and gas-to-gas heat exchanger 11, described dilution wind
Machine 1 is connected by pipeline with ammonia-air mixer 2, the pipe between described dilution air 1 and ammonia-air mixer 2
Road is provided with ammonia entrance.Described air blast 7 is connected with combustion heater 5, described air blast 7 and combustion heater 5 it
Between be provided with fuel gas inlet and burner 6, described ammonia-air mixer 2 with combustion heater 5 after ammonia-spraying grid 3,
It is connected with SCR reactor 4.
The outlet of described SCR reactor 4 is connected with gas-to-gas heat exchanger 11, air-introduced machine 9 and aiutage 8 successively, described gas
Low-temperature industrial waste gas is connected in-gas heat exchanger 11 one end, and its other end connects combustion heater 5 by pipeline.
Described SCR reactor 4 porch arranges system for detecting temperature, is provided with fuel gas inlet regulation valve at described fuel gas inlet,
Described system for detecting temperature associates with fuel gas inlet regulation valve, is automatically adjusted fuel gas inlet by temperature change at reactor inlet
Amount, it is ensured that reactor inlet temperature meets SCR reactor requirement temperature.
Described ammonia porch arranges automatic regulating valve, according to flue gas detecting system on-line checking nitrogen oxides of exhaust gas content
And then change ammonia inlet.
Described gas-to-gas heat exchanger 11 installs bypass 10 between the air inlet and high-temp waste gas outlet pipe of low-temperature industrial waste gas, should
Bypass 10 and gas-to-gas heat exchanger high-temp waste gas export, gas-to-gas heat exchanger low temperature waste gas import is respectively provided with a set of electric guard board
Door or butterfly valve, for the switching of device, to ensure denitrating system not shadow when catalyst change and the trouble hunting carrying out necessity
Ring the properly functioning of workshop.
The denitrating technique process using above-mentioned low-temperature industrial waste gas is as follows:
Low-temperature industrial waste gas from workshop enters combustion heater 5 through gas-to-gas heat exchanger 11, goes out with SCR reactor 4
The high-temp waste gas of mouth carries out heat exchange and realizes preliminary intensification, and the waste gas after intensification enters combustion heater 5, and combustion gas is at burner 6
Interior burning laggard enter combustion heater 5, utilize the heat that fuel gas buring discharges, low-temperature industrial waste gas is heated to SCR reaction
Device 4 requires minimum temperature (or more than 180 DEG C), enters SCR reactor 4 through ammonia-spraying grid 3, and ammonia is by dilute simultaneously
Release blower fan 1 and bring ammonia-air mixer 2 into, after mixing, enter SCR reactor 4 through ammonia-spraying grid 3, in catalysis
Denitration reduction reaction, the NOx in removing waste gas is carried out under agent effect.Waste gas after denitration through gas-to-gas heat exchanger 11,
Outlet high-temperature tail gas is utilized to heat the low-temperature industrial waste gas from workshop, after outlet exhaust temperature is down to normal temperature, through air inducing
Machine 9 is discharged by aiutage 8 after guiding.
The middle low-temperature industrial waste gas in the workshop of the present invention uses two sections of mode of heatings.First paragraph utilizes hot outlet waste gas tentatively to add
Pyrogen low-temperature industrial waste gas, fully recycles waste heat；After second segment will tentatively be heated up by the heat that combustion gas produces
Waste gas is heated to predetermined temperature.Owing to there is not high-temp waste gas during initial driving, it is impossible to carry out preliminary heat exchange intensification, need to pass through
Low temperature waste gas from workshop is directly heated to SCR reactor 4 and requires minimum temperature (more than 180 DEG C) by fuel gas buring.
SCR reactor 4 outlet arranges gas-to-gas heat exchanger 11, utilizes SCR reactor 4 to export high-temp waste gas and heats from car
Between low temperature waste gas, by import low temperature waste gas improve to more than 130 DEG C to save gas consumption, simultaneously high-temp waste gas temperature drop
Discharged to normal temperature by air-introduced machine 9 to aiutage 8.
The present invention directly heats mode with combustion gas and replaces common dividing wall type to heat, and improves heat utilization ratio.
Reducing agent ammonia prepares unit by liquid ammonia storage tank, liquid ammonia evaporator, ammonia surge tank, ammonia-air mixer 2, spray ammonia
Grid 3 forms.The ammonia being made up of liquid ammonia evaporator enters, by ammonia surge tank, the air that blender is introduced with dilution air 1
Mixing.This mixed gas is uniformly sprayed in waste gas system by the ammonia-spraying grid 3 being positioned on inlet pipeline, is sufficiently mixed with waste gas
In rear entrance SCR reactor 4.
Gas heating unit is by groups such as combustion gas storage tank, combustion gas surge tank, air blast 7, burner 6, combustion heaters 5
Become.The air that the combustion gas that combustion gas storage tank comes and air blast 7 are introduced after combustion heat release, enters waste gas heating in burner 6
The waste gas that device 5 and gas-to-gas heat exchanger 11 come carries out adding hot mixing, enters system pipeline together.
The present invention does not describes part in detail, is the known technology of those skilled in the art of the present technique.
Claims (6)
1. the denitrating system of a low-temperature industrial waste gas, it is characterised in that include dilution air, ammonia-air mixer,
Ammonia-spraying grid, SCR reactor, combustion heater, aiutage and gas-to-gas heat exchanger, described dilution air and ammonia-air
Blender is connected by pipeline, and the pipeline between described dilution air and ammonia-air mixer is provided with ammonia entrance, institute
State air blast to be connected with combustion heater, between described air blast and combustion heater, be provided with fuel gas inlet and burner, described
Ammonia-air mixer is connected with SCR reactor after ammonia-spraying grid with combustion heater, going out of described SCR reactor
Mouth is connected with gas-to-gas heat exchanger, air-introduced machine and aiutage successively, and low-temperature industrial waste gas is connected in described gas-to-gas heat exchanger one end,
Its other end connects combustion heater by pipeline.
The denitrating system of low-temperature industrial waste gas the most according to claim 1, it is characterised in that described SCR reactor
Porch arranges system for detecting temperature, is provided with fuel gas inlet regulation valve, described system for detecting temperature and combustion at described fuel gas inlet
Gas inlet adjustment valve associates.
The denitrating system of low-temperature industrial waste gas the most according to claim 1, it is characterised in that described ammonia porch
Automatic regulating valve is set.
The denitrating system of low-temperature industrial waste gas the most according to claim 1, it is characterised in that described gas-gas heat exchange
Device installs bypass between the air inlet and high-temp waste gas outlet pipe of low-temperature industrial waste gas, this bypass and gas-to-gas heat exchanger high temperature
Waste gas outlet, gas-to-gas heat exchanger low temperature waste gas import are respectively provided with a set of electric guard board door.
The denitrating system of low-temperature industrial waste gas the most according to claim 1, it is characterised in that described electric guard board door
Replace with butterfly valve.
6. the denitration of the low-temperature industrial waste gas of the denitrating system of use low-temperature industrial waste gas described in any one of claim 1-5
Technique, it is characterised in that comprise the following steps:
Heat exchange realization is carried out at gas-to-gas heat exchanger from the low-temperature industrial waste gas in workshop and the high-temp waste gas of SCR reactor outlet
Preliminary heating up, the waste gas after intensification enters combustion heater, combustion gas burn in burner laggard enter combustion heater, utilize
The heat of fuel gas buring release, is heated to SCR reactor requirement minimum temperature by low-temperature industrial waste gas, enters through ammonia-spraying grid
SCR reactor, ammonia brings ammonia-air mixer into by dilution air simultaneously, after mixing, enters through ammonia-spraying grid
SCR reactor, carries out denitration reduction reaction, the NOx in removing waste gas, the waste gas after denitration under catalyst action
Through gas-to-gas heat exchanger, utilize outlet high-temperature tail gas heating from the low-temperature industrial waste gas in workshop, outlet exhaust temperature is dropped
To normal temperature, discharged by aiutage after air-introduced machine guides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610161138.9A CN105749738A (en) | 2016-03-18 | 2016-03-18 | Denitration system and process of low-temperature industrial waste gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610161138.9A CN105749738A (en) | 2016-03-18 | 2016-03-18 | Denitration system and process of low-temperature industrial waste gas |
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| CN105749738A true CN105749738A (en) | 2016-07-13 |
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| CN201610161138.9A Pending CN105749738A (en) | 2016-03-18 | 2016-03-18 | Denitration system and process of low-temperature industrial waste gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731832A (en) * | 2017-01-09 | 2017-05-31 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust denitrating system |
| CN108043226A (en) * | 2018-01-26 | 2018-05-18 | 上海电力学院 | Combustion type generator tail gas denitration treatment device |
| CN109059012A (en) * | 2018-08-16 | 2018-12-21 | 天津大学 | Ground flare closed type combusting device vent gas denitrating system and method |
| CN109253459A (en) * | 2018-08-16 | 2019-01-22 | 天津大学 | Ground flare closed type combusting device vent gas denitration and dust pelletizing system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103463976A (en) * | 2013-05-16 | 2013-12-25 | 上海宝钢节能技术有限公司 | Sintering and pelletizing flue gas SCR denitration and dioxin removal apparatus |
| CN203408631U (en) * | 2013-08-19 | 2014-01-29 | 北京方信立华科技有限公司 | Selective catalytic reduction denitration device for NOx containing waste gases |
| CN104190253A (en) * | 2014-08-25 | 2014-12-10 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas SCR denitration system |
-
2016
- 2016-03-18 CN CN201610161138.9A patent/CN105749738A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103463976A (en) * | 2013-05-16 | 2013-12-25 | 上海宝钢节能技术有限公司 | Sintering and pelletizing flue gas SCR denitration and dioxin removal apparatus |
| CN203408631U (en) * | 2013-08-19 | 2014-01-29 | 北京方信立华科技有限公司 | Selective catalytic reduction denitration device for NOx containing waste gases |
| CN104190253A (en) * | 2014-08-25 | 2014-12-10 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas SCR denitration system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731832A (en) * | 2017-01-09 | 2017-05-31 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust denitrating system |
| CN108043226A (en) * | 2018-01-26 | 2018-05-18 | 上海电力学院 | Combustion type generator tail gas denitration treatment device |
| CN109059012A (en) * | 2018-08-16 | 2018-12-21 | 天津大学 | Ground flare closed type combusting device vent gas denitrating system and method |
| CN109253459A (en) * | 2018-08-16 | 2019-01-22 | 天津大学 | Ground flare closed type combusting device vent gas denitration and dust pelletizing system and method |
| CN109253459B (en) * | 2018-08-16 | 2023-08-04 | 天津大学 | Ground torch closed type combustor exhaust gas denitration and dust removal system and method |
| CN109059012B (en) * | 2018-08-16 | 2023-10-10 | 天津大学 | Ground torch closed combustor exhaust gas denitration system and method |
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Effective date of registration: 20180328 Address after: 433226 Jingzhou City, Honghu, China Town, the city of road, No. 23 Applicant after: HUBEI SIBOYING ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Address before: 230001 Anhui Hefei high tech Zone Innovation Avenue 2800 Hefei innovation industrial park two phase F1 building 202, 203 Applicant before: Hefei Chen Xi Ingegneria Ambientale SRL |
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