CN104383808A - Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent - Google Patents
Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent Download PDFInfo
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- CN104383808A CN104383808A CN201410722256.3A CN201410722256A CN104383808A CN 104383808 A CN104383808 A CN 104383808A CN 201410722256 A CN201410722256 A CN 201410722256A CN 104383808 A CN104383808 A CN 104383808A
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Abstract
The invention discloses a process and a device for carrying out flue gas denitrification by utilizing a solid organic denitrifying agent. According to the process, an organic denitrifying reducing agent is sprayed into a reaction area at the fume temperature of 500-950 DEG C and gasified and is subjected to selective uncatalyzed reaction with NOx contained in smoke gas, so that the purpose of denitrification is achieved. The core device of the process is highly-integrated integral equipment, is designed according to unit system and mainly comprises a denitrifying agent delivery supply system, a metering distribution system, a fluidic system, a gas delivery system, a chemical agent injection system and an on-line monitoring system. According to the smoke gas denitrification technology of the solid organic denitrifying agent, no change needs to be made on a boiler, and only the injection system needs to be added to the position at the fume temperature of 500-950 DEG C and between the smoke gas outlet of the boiler and a superheater. The process and the device which are disclosed by the invention have the characteristics of low operating cost, high safety, obviousness in denitrification effect and the like.
Description
Technical field
The present invention relates to industrial smoke denitration technology field, a kind of technique and the device that utilize solid-state organic denitrfying agent to carry out denitrating flue gas are provided.
background technology
Energy resource structure based on coal is the principal element affecting China's atmosphere quality, and coal-burning pollution is the principal character of atmosphere pollution.Along with the raising of people's environmental consciousness and government are to the promulgation of boiler sulfur dioxide and nitrogen oxide the highest permission concentration of emission policy and enforcement, to the SO in flue gas
2and NO
xcarry out controlling being very urgent task.
According to " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) requirement of up-to-date promulgation, from 1 day July in 2014, existing coal-fired thermal power generation boiler nitrogen oxides pollution thing emission standard is decided to be 100mg/m
3, to the large most important discharge index of thermal power plant three: nitrogen
oxide,
sulfur dioxidewith the emission regulation of flue dust, all meet or exceed the requirement of developed countries and regions.The requirement of the environmental protection Room, Environmental Protection Agency at different levels will list enterprise's inventory of local execution new standard.To can not the limited production that will implement to be no more than 3 months of the enterprise of qualified discharge administer, firm stopping production still not up to standard.
At present, industrial smoke denitration technology mainly adopts selective catalytic reduction (SCR method) and SNCR method (SNCR method), required by the two has Combustion Operation of Boilers, causes conventional art to be also in technology blind area to chain furnace.SCR method is applicable to large coal fired boilers, and use catalyst to carry out denitration, Long-Time Service easily causes air preheater to block.This method needs to transform air-introduced machine, air preheater usually, because installation site is between economizer and air preheater, more by conditionality, and higher to the requirement of flue gas flow field, shortcomings such as there is investment, operating cost is high, floor space is large, system cloud gray model, maintenance are complicated.SNCR method is applicable to CFBB, and need higher temperature (900 ~ 1100 DEG C), its cost of investment is lower, but the escaping of ammonia rate is comparatively large, and denitration efficiency is relatively low, and can not meet the demands qualified discharge.Tradition denitrating technique adopts ammoniacal liquor or urea as reducing agent usually, and it stores, Transport Safety is low, and the escaping of ammonia rate is comparatively large, is that wastewater treatment subsequently brings comparatively hang-up while adding flood consumption.On the other hand, the solid particulate matter that the saturated vapor that the ammonium sulfate (aerosol) thereupon produced during fume treatment and large water gaging are formed adsorbs all can affect follow-up dust arrester, and affects air quantity.
summary of the invention
The object of the invention is to the above-mentioned defect overcoming existing traditional industry gas denitrifying technology, there is provided a kind of technique and the device that utilize solid-state organic denitrfying agent to carry out denitrating flue gas, significantly, security is high for this flue gas NO_x Reduction by Effective technique and device denitration effect, and structure is simple, easy to implement.
One utilizes solid-state organic denitrfying agent to carry out flue-gas denitration process, comprises the following steps:
(1) solid-state organic denitrfying agent being sprayed into temperature is in the denitration reaction district of 500 ~ 950 DEG C, make it gasification and with the NO in flue gas
xgeneration SNCR reacts, and its product is N
2and H
2o.
Described solid-state organic denitrfying agent comprises organic component, carbonic hydroammonium, activated Calcium carbonate, and wherein organic component is one or both of acetamide and Triammonium citrate.
(2) NO in reducing agent and flue gas
xafter carrying out reduction reaction, end product is only N
2and H
2o, has neither part nor lot in organic denitrfying agent and all the other products of reduction reaction, due to inflammable easy decomposition, all becomes ash content in flue combustion, and their chances directly to environmental leak from flue gas are little.This reaction no coupling product, can not produce secondary pollution to environment.Described denitrating technique makes most of NO in flue gas
xbe reduced to N
2, denitration rate can reach more than 90%, and the escaping of ammonia rate can be controlled in below 2ppm simultaneously.
In described step (1), solid-state organic denitrfying agent is solid powder, and this medicament denitration effect is remarkable, and have desulfidation concurrently, its desulfuration efficiency is 25% ~ 50%.
Described solid-state organic denitrfying agent sprays into speed preferably 10 m/s ~ 15m/s, the NO in denitrfying agent straying quatity and flue gas
xmass ratio be 1.1:1 ~ 2.8:1.
NO in solid-state organic denitrfying agent and flue gas in described step (1)
xoptimal reaction temperature be 850 ~ 950 DEG C, too high or too low for temperaturely all can cause the loss of denitrfying agent and the reduction of denitration efficiency.
The invention provides a kind of device for realizing above-mentioned boiler smoke NO_x Reduction by Effective technique, this device is highly integrated integration apparatus, its specification is 20 chi TEU (Twenty-foot Equivalent Unit)s, comprises denitrfying agent conveying supply system, metering distribution system, fluidic system, pneumatic transmission system, chemical agent spraying system, on-line monitoring system.
Solid-state organic denitrfying agent is stored in hopper, enter in corrosion-resistant stainless steel material storage bin by automatic charging elevator, draw off at material mouth after adjustable rotation equivalent metering feeder, enter venturi gas material mixing accelerating chamber subsequently and spray according to the speed set, time.The described venturi gas material mixing accelerating chamber port of export is connected with some roads metered dispensing unit, the corresponding spraying system of each road metered dispensing unit.Described boiler horizontal gas pass is provided with reducing agent spray gun, and the gas material mixture through the ejection of venturi gas material mixing accelerating chamber enters in reaction zone by above-mentioned reducing agent spray gun, rapidly gasification and the NO in flue gas
xanti-raw reduction reaction.Described on-line monitoring system carries out Real-Time Monitoring to fume emission situation, when gained Monitoring Data passes to central control module, the amount of central control module instruction Electronic Control dispenser to required input reducing agent adjusts, the central authorities of instruction simultaneously air pump adjustment stream pressure and air quantity.Described system and device all adopts intelligence control system to carry out real-time monitoring.
Described denitrfying agent conveying supply system is provided with level-sensing device, can carry out Effective Regulation to reducing agent feeding quantity and feed time.
Described pneumatic transmission system adopts high efficiency switched reluctance motor, with twin-stage blower unit for source of the gas, produces the continuous force feed material of gases at high pressure.
Described reducing agent spray gun employing is high temperature resistant, jet pipe (sleeve structure with base) fixed by stainless steel, and being preferably arranged on cigarette temperature is 850 ~ 950 DEG C of positions.
Described spraying system point of penetration according to boiler form difference difference to some extent, above the preferred burner hearth of chain furnace and between superheater cigarette temperature be 850 ~ 950 DEG C of positions as point of penetration, according to the different point of penetration height of operating mode load difference to some extent.The preferred cigarette temperature of CFBB is that the horizontal flue section of 850 ~ 950 DEG C is as point of penetration.
The scope of application: the technique that the present invention relates to and device are applicable to the Flue Gas Denitrification Engineering of the fire coal such as CFBB and chain furnace, combustion gas, biomass fuel boiler.
Beneficial effect:
Present invention process and device comparatively have following outstanding advantages compared with prior art:
Security is high: the present invention adopts solid-state organic denitrfying agent to replace liquefied ammonia as denitrification reducing agent, and security is high, ensure that the health of human body safety of operating personnel, can not cause secondary pollution to environment.
Be very effective: denitration rate of the present invention is far away higher than existing conventional art, and its denitration rate is up to more than 90%.Solid-state organic denitrification reducing agent that this technology adopts can also with the SO in flue gas on the basis of denitration
2react, have certain desulfidation, desulfuration efficiency is 25% ~ 50%.
Cost of investment is low: to instant invention overcomes in existing technique the defects such as high water consumption, high power consumption, and while reduction energy consumption, improve denitration efficiency, apparatus and process is advanced, reaches advanced international level, greatly reduce technique post-processed expense in energy-saving and emission-reduction.
Simple installation: apparatus of the present invention are installed simple, and floor space is little, and this technology does not need to change original boiler plant, only needs to increase spraying system on existing basis.System architecture is simple, and simple to operation, the construction period is short.
Can not have an impact to upstream device: present invention reduces the escaping of ammonia rate, avoid solid particulate matter that ammonium sulfate (aerosol) and saturated vapor adsorb to the blocking of downstream cleaner.This technique adopts the NO in solid-state organic denitrfying agent removal flue gas
x, can not secondary pollution be produced while reduction water consumption, effectively alleviate subsequent wastewater treatment load.
accompanying drawing explanation
For CFBB utilizes, solid-state organic denitrfying agent carries out the process unit schematic diagram of denitrating flue gas to accompanying drawing 1.
specific implementation method
Below in conjunction with specific embodiment, technical scheme of the present invention is described in further details:
Equipment for denitrifying flue gas as shown in drawings, when in control flue gas, oxygen content, under 6% condition, sprays into solid-state organic denitrfying agent, medicament/NO by middle high temperature section (500 DEG C ~ 800 DEG C) or high temperature section (800 DEG C ~ 950 DEG C)
xmass ratio is 1.1:1 ~ 2.8:1.
Embodiment 1:
NO in pending flue gas
xinitial concentration be 450 mg/m
3, cigarette temperature, within the scope of 850 DEG C ~ 950 DEG C, per hourly sprays into solid-state organic denitrfying agent 53.30kg in flue reactor, and its concrete composition is acetamide 34.65kg, carbonic hydroammonium 5.33kg, activated Calcium carbonate 13.32kg, with NO
xmass ratio react by 1.2:1, after process, flue gas enters on-line monitoring system and carries out Real-Time Monitoring.
Table 1 Different periods denitrating flue gas efficiency
Embodiment 2:
As described in Example 1, difference is: cigarette temperature, within the scope of 650 DEG C ~ 800 DEG C, per hourly sprays into solid-state organic denitrfying agent 63.79kg in flue reactor, its concrete composition is Triammonium citrate 41.46kg, carbonic hydroammonium 6.38kg, activated Calcium carbonate 15.95kg, with NO
xmass ratio react by 1.5:1, after process, flue gas enters on-line monitoring system and carries out Real-Time Monitoring.
Table 2 Different periods denitrating flue gas efficiency
Embodiment 3:
NO in pending flue gas
xinitial concentration be 750 mg/m
3, cigarette temperature, within the scope of 850 DEG C ~ 950 DEG C, per hourly sprays into solid-state organic denitrfying agent 232.88kg in flue reactor, and its concrete composition is acetamide 151.37kg, carbonic hydroammonium 23.29kg, activated Calcium carbonate 58.22kg, with NO
xmass ratio react by 1.5:1, after process, flue gas enters on-line monitoring system and carries out Real-Time Monitoring.
Table 3 Different periods denitrating flue gas efficiency
Embodiment 4:
As described in example 3, difference is: cigarette temperature, within the scope of 650 DEG C ~ 800 DEG C, per hourly sprays into solid-state organic denitrfying agent 273.24kg in flue reactor, its concrete composition is acetamide 106.57kg, Triammonium citrate 71.04kg, carbonic hydroammonium 27.32kg, activated Calcium carbonate 68.31kg, with NO
xmass ratio react by 1.8:1, after process, flue gas enters on-line monitoring system and carries out Real-Time Monitoring.
Table 4 Different periods denitrating flue gas efficiency
Claims (12)
1. the invention provides a kind of solid-state organic denitrfying agent, it is characterized in that: this denitrfying agent consists of organic component, carbonic hydroammonium, activated Calcium carbonate, wherein organic component is one or both of acetamide and Triammonium citrate.
2. the invention provides a kind of boiler smoke NO_x Reduction by Effective technique and device, it is characterized in that: system and device is highly integrated equipment, its specification is 20 chi TEU (Twenty-foot Equivalent Unit)s, comprises denitrfying agent conveying supply system, metering distribution system, fluidic system, pneumatic transmission system, chemical agent spraying system, on-line monitoring system.
3. the solid-state organic denitrfying agent according to right 1, is characterized in that, its denitration efficiency, up to more than 90%, has desulfidation concurrently, and desulfuration efficiency is 25% ~ 50%.
4. according to claim 1 and 2ly utilize solid-state organic denitrfying agent to carry out the technique of denitrating flue gas, it is characterized in that, spraying into temperature using the reducing agent of solid-state organic denitrfying agent in this technique is in 500 ~ 950 DEG C of denitration reaction districts, it sprays into the preferred 10m/s ~ 15m/s of speed, the NO in straying quatity and flue gas
xmass ratio be 1.1:1 ~ 2.8:1, optimal reaction temperature is 850 ~ 950 DEG C, and simultaneously the escaping of ammonia rate can be controlled in below 2ppm.
5. according to claim 1 and 2ly utilize solid-state organic denitrfying agent to carry out the technique of denitrating flue gas, it is characterized in that, described technique and device, at run duration, while reducing power consumption and anhydrous consumption, reach energy-saving and emission-reduction requirement.
6. technique and the device utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, is characterized in that, described denitrfying agent conveying supply system is provided with level-sensing device, can carry out Effective Regulation to reducing agent feeding quantity and feed time.
7. technique and the device utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, it is characterized in that, the described venturi gas material mixing accelerating chamber port of export is connected with some roads metered dispensing unit, the corresponding spraying system of each road metered dispensing unit.
8. technique and the device utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, it is characterized in that, described on-line monitoring system carries out Real-Time Monitoring to fume emission situation.
9. technique and the device utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, is characterized in that, described pneumatic transmission system adopts high efficiency switched reluctance motor, with twin-stage blower unit for source of the gas, produces the continuous force feed material of gases at high pressure.
10. technique and the device utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, is characterized in that, described reducing agent spray gun employing is high temperature resistant, jet pipe (sleeve structure with base) fixed by stainless steel.
11. technique and the devices utilizing solid-state organic denitrfying agent to carry out denitrating flue gas according to claim 1 and 2, it is characterized in that, described spraying system point of penetration is according to boiler form difference difference to some extent, above the preferred burner hearth of chain furnace and between superheater cigarette temperature be 850 ~ 950 DEG C of positions as point of penetration, the preferred cigarette temperature of CFBB is that the horizontal flue section of 850 ~ 950 DEG C is as point of penetration.
12. according to claim 1 and 2 utilize solid-state organic denitrfying agent to carry out denitrating flue gas technique and device be applicable to the Flue Gas Denitrification Engineering of the fire coal such as CFBB, chain furnace, combustion gas, biomass fuel boiler.
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|---|---|---|---|
| CN201410722256.3A CN104383808A (en) | 2014-12-03 | 2014-12-03 | Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent |
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|---|---|---|---|
| CN201410722256.3A CN104383808A (en) | 2014-12-03 | 2014-12-03 | Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823721A (en) * | 2017-02-23 | 2017-06-13 | 中国石油大学(北京) | A kind of flue gas desulfurization and denitrification agent and its preparation method and application |
| CN107349780A (en) * | 2017-08-10 | 2017-11-17 | 中国铝业股份有限公司 | A kind of aluminium cathode baking furnace fume Dry denitration method |
| CN109621677A (en) * | 2018-12-29 | 2019-04-16 | 山东九和节能环保科技有限公司 | A kind of composite denitration medicament and preparation method thereof |
| CN109908728A (en) * | 2018-04-27 | 2019-06-21 | 北京英斯派克科技有限公司 | A kind of device and method for high-temperature flue gas denitration |
| CN111185083A (en) * | 2018-11-15 | 2020-05-22 | 东莞市升佳净水材料有限公司 | Novel powdery solid denitration device for flue gas of combustion furnace |
| CN111437702A (en) * | 2020-04-09 | 2020-07-24 | 铜陵市菲力克测控技术有限公司 | PNCR (pneumatic nitrogen reduction reactor) denitration device and using method thereof |
| CN112090254A (en) * | 2020-09-18 | 2020-12-18 | 北京华电光大环境股份有限公司 | Fuel oil and gas boiler PNCR and low-temperature SCR combined denitration system and process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823721A (en) * | 2017-02-23 | 2017-06-13 | 中国石油大学(北京) | A kind of flue gas desulfurization and denitrification agent and its preparation method and application |
| CN107349780A (en) * | 2017-08-10 | 2017-11-17 | 中国铝业股份有限公司 | A kind of aluminium cathode baking furnace fume Dry denitration method |
| CN109908728A (en) * | 2018-04-27 | 2019-06-21 | 北京英斯派克科技有限公司 | A kind of device and method for high-temperature flue gas denitration |
| CN111185083A (en) * | 2018-11-15 | 2020-05-22 | 东莞市升佳净水材料有限公司 | Novel powdery solid denitration device for flue gas of combustion furnace |
| CN109621677A (en) * | 2018-12-29 | 2019-04-16 | 山东九和节能环保科技有限公司 | A kind of composite denitration medicament and preparation method thereof |
| CN111437702A (en) * | 2020-04-09 | 2020-07-24 | 铜陵市菲力克测控技术有限公司 | PNCR (pneumatic nitrogen reduction reactor) denitration device and using method thereof |
| CN112090254A (en) * | 2020-09-18 | 2020-12-18 | 北京华电光大环境股份有限公司 | Fuel oil and gas boiler PNCR and low-temperature SCR combined denitration system and process |
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Application publication date: 20150304 |