CN102688688B - SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers - Google Patents
SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers Download PDFInfo
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- CN102688688B CN102688688B CN201210187700.7A CN201210187700A CN102688688B CN 102688688 B CN102688688 B CN 102688688B CN 201210187700 A CN201210187700 A CN 201210187700A CN 102688688 B CN102688688 B CN 102688688B
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Abstract
The invention discloses an SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers, comprising a dissolving module which is used for preparing urea liquid, a storing module which is connected with the outlet of the dissolving module and used for storing the prepared urea liquid, a dilution module which is connected with the outlet of the storing module and used for diluting the urea liquid, a distribution measuring module which is connected with the outlet of the dilution module and used for measuring and distributing the urea liquid after being diluted into multiple paths, a nuzzling module which comprises a spray gun connected with the tail end of each path after measuring and distributing, and a compressed air module which is used for providing the atomizing air for the spray gun located in the middle part of each path after measuring and distributing. The SNCR denitration device in the invention can feed the reducing agent according to the steady measurement to the high-temperature flue gas, can implement the denitration reaction after the reducing agent is mixed with the flue gas, has long stopping time at the reaction temperature window area, and has advantages of a steady system, high efficiency, low consumption and high automaticity...
Description
Technical field
The invention belongs to gas denitrifying technology field, relate in particular to a kind of low-consumption high-efficiency SNCR denitrification apparatus for CFBB.
Background technology
In recent years, China NO
xdischarge capacity rises rapidly along with the rapid growth of energy-consuming and vehicle guaranteeding organic quantity.NO
xbecome one of main atmosphere pollution.In view of NO
xto the adverse effect of atmospheric environment and the current NO of thermal power plant
xthe severe situation of emission control, country proposes to control planning and the requirement of NOX discharge during " 12 ".New fossil-fuel power plant atmospheric pollutant emission standard (GB 13223-2011) requirement, newly-built fired power generating unit plays NOX discharge lower than 100mg/m on January 1st, 2012
3(6%O
2), general above denitrification apparatus; Active service W flame furnace, recirculating fluidized bed (CFB) unit NO
xdischarge is lower than 200mg/m
3(6%O
2), new-built unit requirement is also carried out in key area.Therefore it is imperative that, part CFB boiler carries out denitration transformation.
SNCR is the flue-gas denitration process that is applied to a kind of comparative maturity of pulverized-coal fired boiler, in the situation that not adding catalyst, uses denitrification reducing agent (urea liquid or ammoniacal liquor etc.) directly to spray in the flue gas of 850 ℃ ~ 1150 ℃, with NO
xreduction reaction occurs, and product is water and N
2, reduce NO
xdischarge.CFB boiler is as a kind of low NO
xtechnology, its NO
xdischarge is generally at 150 ~ 300mg/m3(6%O
2), for further reducing NO in CFB boiler smoke
xconcentration of emission, makes its discharge reach up-to-date environmental protection standard requirement, needs to adopt gas denitrifying technology.
But SNCR is applied to that CFB boiler is at present domestic still belongs to blank, has a small amount of device to put into operation abroad, and is in operation and has more defect.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of low-consumption high-efficiency SNCR denitrification apparatus for CFBB, can realize reducing agent feeds high-temperature flue gas by quantification stability and mixes with flue gas to be and carry out denitration reaction, the reaction temperature window region time of staying is long, and system stability, efficient, low consumption, automaticity are high.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A low-consumption high-efficiency SNCR denitrification apparatus for CFBB, comprising:
For preparing the dissolving module 1 of urea liquid;
Connect and dissolve module 1 outlet for storing the memory module 2 of its urea liquid of preparing;
Connect the dilution module 3 of memory module 2 outlets for urea liquid is diluted;
Connect 3 outlets of dilution module and urea solution metering after dilution is assigned as to the distribution and computation module 4 of multichannel;
The jet module 6 being formed by the spray gun 37 that is connected in each the road end after metering distributes;
And,
The compressed air module 5 of atomizing air is provided for spray gun 37 in the middle of each road after being arranged at metering and distributing.
The present invention can also comprise waste heat recycling module 36, the coolant outlet of waste heat recycling module 36 1 termination spray guns 37, and the other end connects respectively and dissolves module 1 and memory module 2.
Described dissolving module 1 comprises the airtight urea liquid preparation tank 7 with the first overflow pipe 17 and first emptying valve 14, urea liquid preparation tank 7 connects heating steam source 38 and dissolves water source 39, the first temperature measuring set 16 is set in urea liquid preparation tank 7, liquid level gauge 12 and agitator 8, agitator 8 connects agitator motor 9, termination funnel 10 in urea liquid preparation tank 7, the outlet that is positioned at urea liquid preparation tank 7 bottoms is provided with the first circulating pump 18, exudate through the first circulating pump 18 is divided into two-way, one road tieback is to urea liquid preparation tank 7, another road is connected to memory module 2.
Described memory module 2 comprises the urea liquid storage tank 21 with the second overflow pipe 23 and second emptying valve 24, another road of described the first circulating pump 18 is connected to urea liquid storage tank 21, urea liquid storage tank 21 connects heating steam source 38, the second temperature measuring set 22 is set in urea liquid storage tank 21, the outlet that is positioned at the bottom of urea liquid storage tank 21 is provided with the second circulating pump 26, through the exudate of the second circulating pump 26, is connected to dilution module 3.
Described dilution module 3 comprises blender 27, and the described exudate through the second circulating pump 26 is connected to an entrance of blender 27, and another entrance of blender 27 connects dilution water source 40, and the outlet of blender 27 is connected to distribution and computation module 4.
Described distribution and computation module 4 comprises flowmeter 31 and the control valve 32 of many group series connection, according to flow, the fluid of blender 27 need to be divided into multichannel.
Described compressed air module 5 comprises compressed air main valve 33 and the atomizing air control valve 34 that is connected to successively compressed air source 41, and the atomizing air control valve 34 of the compressed air main valve 33 of compressed air of compressed air source 41 before by each spray gun 37 inputs to corresponding spray gun 37.
Described spray gun 37 comprises parallel aqueous suction pipes 3705 and air hose 3707, inner sleeve 3702 is enclosed within on aqueous suction pipes 3705 and air hose 3707, outer tube 3701 is enclosed within on inner sleeve 3702, outer tube 3701 pipe wall hollows and with one deck interlayer of not sealing 3720 parallel with its tube wall, interlayer 3720 is divided into internal layer 3721 and outer 3722 by the hollow tube wall of outer tube 3701, internal layer 3721 connects cooling water water inlet interface 3704, outer 3722 connect cooling water water outlet mouthpiece 3703, and aqueous suction pipes 3705 and air hose 3707 are all connected to the nozzle 3713 of taper.
Described spray gun 37 is vertically installed on the horizontal flue of CFBB.
The present invention compared with prior art has the following advantages:
(1) modularization of the present invention, systematization, automaticity are high, and all operations only need operate in control room.
(2) unique gun design, extended the service life of spray gun, stability, the reliability of spray gun work have been guaranteed, simultaneously, adopted exclusive Water cooling type spray gun, the recirculated cooling water utilizing is drawn and gets back to solution module and memory module, for preparation and the storage of urea liquid provides heat source, saved steam consumption quantity.During whole system normal operation, need hardly extra steam can realize preparation and the storage of urea liquid.
(3) adopt water-cooling pattern to replace conventional spray gun air cooling way and by heat recovery and utilization, can reduce approximately 1000 ~ 3000m of compressed air consumption
3/ h, saves the impact that boiler efficiency decline was invested and slowed down to air compressor machine.
(4) choosing of exclusive horizontal flue spray site position, the transformation that makes SNCR denitration technology be applied to existing CFB has had higher operability, changes little, small investment, denitration efficiency is high.Spray gun is arranged vertically on horizontal flue, and this place's flue sectional area is little, flow velocity is high, be convenient to mixing; Flue gas enters cyclone separator after spray gun layout points at once, and turbulent flow is violent herein, has aggravated the mixing velocity of reductant solution and flue gas, and reduction reaction is occurred faster, and denitration efficiency can reach more than 60%.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, the flow direction signal that in figure, arrow is various fluids.
Fig. 2 is a kind of spray gun structure schematic diagram of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, describe embodiments of the present invention in detail.
As shown in Figure 1, a kind of low-consumption high-efficiency SNCR denitrification apparatus for CFBB of the present invention, comprising:
For preparing the dissolving module 1 of urea liquid: dissolve module 1 and comprise the airtight urea liquid preparation tank 7 with the first overflow pipe 17 and first emptying valve 14, urea liquid preparation tank 7 connects heating steam source 38 and dissolves water source 39, the first temperature measuring set 16, liquid level gauge 12 and agitator 8 are set in urea liquid preparation tank 7, agitator 8 connects agitator motor 9, termination funnel 10 in urea liquid preparation tank 7, the outlet that is positioned at urea liquid preparation tank 7 bottoms is provided with the first circulating pump 18, completes the preparation of urea liquid in urea liquid preparation tank 7.The urea liquid preparing through the exudate of the first circulating pump 18 be divided into two-way ，Yi road through circulation control valve 20 tiebacks to urea liquid preparation tank 7, another road is connected to memory module 2 through outlet valve of circulating pump 19.
Connect 1 outlet of dissolving module and comprise the urea liquid storage tank 21 with the second overflow pipe 23 and second emptying valve 24 for storing the memory module 2 of its urea liquid of preparing, urea liquid storage tank 21 can arrange one or more according to actual conditions, and General Requirements can guarantee the continuous operation of system 5 ~ 7 days.The storing temperature of the urea liquid having configured if guarantee solution at this temperature without crystallization, design temperature lower limit, when temperature is lower than lower limit, heating steam valve II25 utilizes steam or utilizes waste heat recycling module 36 automatically to regulate.The coolant outlet of waste heat recycling module 36 1 termination spray guns 37, the other end connects respectively and dissolves module 1 and memory module 2.Another road of the first circulating pump 18 is connected to urea liquid storage tank 21, urea liquid storage tank 21 connects heating steam source 38, the second temperature measuring set 22 is set in urea liquid storage tank 21, the outlet that is positioned at the bottom of urea liquid storage tank 21 is provided with the second circulating pump 26, through the exudate of the second circulating pump 26, is connected to dilution module 3.
Connect memory module 2 outlets for the dilution module 3 of urea liquid dilution is comprised to blender 27, the described exudate through the second circulating pump 26 is connected to an entrance of blender 27, another entrance of blender 27 connects dilution water source 40, and the outlet of blender 27 is connected to distribution and computation module 4.
Connect 3 outlets of dilution module and urea solution metering after dilution is assigned as to the distribution and computation module 4 of multichannel: distribution and computation module 4 comprises flowmeter 31 and the control valve 32 of many group series connection, according to flow, the fluid of blender 27 need to be divided into multichannel.
The jet module 6 being formed by the spray gun 37 that is connected in each the road end after metering distributes;
And,
In the middle of each road after being arranged at metering and distributing, for spray gun 37, provide the compressed air module 5 of atomizing air: compressed air module 5 comprises compressed air main valve 33 and the atomizing air control valve 34 that is connected to successively compressed air source 41, the atomizing air control valve 34 of the compressed air main valve 33 of compressed air of compressed air source 41 before by each spray gun 37 inputs to corresponding spray gun 37.
As shown in Figure 2, spray gun 37 of the present invention comprises parallel aqueous suction pipes 3705 and air hose 3707, inner sleeve 3702 is enclosed within on aqueous suction pipes 3705 and air hose 3707, outer tube 3701 is enclosed within on inner sleeve 3702, outside outer tube 3701, there is mounting flange 3719, in inner sleeve 3702, have vertical supporting construction 3715 to support, supporting construction 3715 is realized and being contacted with the airtight of inner sleeve 3702 by supporting construction sealing gasket 3718.Outer tube 3701 pipe wall hollows and with one deck interlayer of not sealing 3720 parallel with its tube wall, interlayer 3720 is divided into internal layer 3721 and outer 3722 by the hollow tube wall of outer tube 3701, internal layer 3721 connects cooling water water inlet interface 3704, outer 3722 connect cooling water water outlet mouthpiece 3703, aqueous suction pipes 3705 and air hose 3707 are all connected to the nozzle 3713 of taper, the another end of aqueous suction pipes 3705 has aqueous suction pipes joint 3706 to receive on water supply line, on it, there is water pipe end socket 3716, the another end of air hose 3707 is free gas-tpe fitting 3708 to receive on steam line, this end position is also provided with movement connecting mechanism 3717, the side of nozzle 3713 is connected to annular liquid cap 3709 by nozzle connection 3710, liquid cap gasket sheet 3711 of liquid cap 3709 below pad carries out fit sealing, the termination of nozzle 3713 is provided with an air cap 3712, air cap gasket seal of air cap 3712 below pad 3714 carries out fit sealing, whole spray gun 37 is vertical or be horizontally placed on the flue of CFBB.
The operation principle of spray gun 37 is:
Recirculated cooling water enters inner sleeve 3702 by cooling water water inlet interface 3704, with rifle body, enter spray gun leading portion, finally from the cooling water water outlet mouthpiece 3703 of outer tube 3701, turn back to the female pipe of recirculated water backwater, this kind of endless form strengthened heat transfer effect, improved the cooling effect to spray gun.Movement connecting mechanism 3717, by being connected with cylinder (or other movable body), drives ejection assemblies flexible, and nozzle 3713 can be adjusted thereupon, also can, in the situation that not changing nozzle 3713 outward appearance, change nozzle flow, operating pressure energy performance parameter.While quitting work, ejection assemblies can be recovered in the internal and external casing of water-cooled, guarantee that nozzle is not burned, solve the problem of nozzle long term exposure easy scaling loss in high-temperature flue gas in the past.
The course of work of the present invention is as follows:
Dissolve module 1 after receiving instruction, dissolve water valve 13 and open, solution water enters into urea liquid preparation tank 7, and agitator motor 9 drives agitator 8 runnings to start to prepare solution.When liquid level gauge 12 arrives designated value, hopper valve 11 is opened, and urea adds from funnel 10.Urea is added to after designated value, starts to stir.In whipping process, heating steam valve I15 also sets value comparison according to temperature measuring set value of feedback, utilizes steam to realize Automatic-heating.Circulating pump 18 prepares signal receiving urea liquid, and entry into service, is transported to storage tank 21 by urea liquid.Memory module 2 receives the instruction that puts into operation and starts automatic operation, pressure flow regulates and carries out variable frequency adjustment according to setting value, by mixing up solution, deliver to the blender 27 in dilution module 3 afterwards, utilize urea liquid valve 29 to control conveying capacity, control blender 27 and the diluting water regulating valve 28 diluting on water source 40 pipelines, according to urea liquid flow, carry out automatic mixing adjusting.The dilute solution that goes out blender 27 is controlled and is entered into distribution and computation module 4 by dilute solution control valve 30, many groups flowmeter 31 in distribution and computation module 4 and control valve 32, according to flow, dilution need to be divided into multichannel, enter into afterwards jet module 6, offer each spray gun 37.Spray gun 37 provides atomizing air by compressed air module 5, by controlling compressed air main valve 33 and atomizing air control valve 34, the compressed air of compressed air source 41 can be provided to spray gun 37 uses, in course of injection, can utilize waste heat recycling module 36 that all spray gun cooling waters are collected and are returned to urea liquid preparation tank 7 and storage tank 21, realize energy-conservation.
Claims (8)
1. for a low-consumption high-efficiency SNCR denitrification apparatus for CFBB, comprising:
For preparing the dissolving module (1) of urea liquid;
Connect and dissolve the memory module (2) of module (1) outlet for storing its urea liquid of preparing;
Connect the dilution module (3) of memory module (2) outlet for urea liquid is diluted;
Connect dilution module (3) outlet and urea solution metering after dilution is assigned as to the distribution and computation module (4) of multichannel;
The jet module (6) being formed by the spray gun (37) that is connected in each the road end after metering distributes;
And,
Being arranged at each road of measuring after distributing middle is the compressed air module (5) that spray gun (37) provides atomizing air;
It is characterized in that, also comprise waste heat recycling module (36), the coolant outlet of waste heat recycling module (36) one termination spray guns (37), the other end connects respectively and dissolves module (1) and memory module (2).
2. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 1, it is characterized in that, described dissolving module (1) comprises the airtight urea liquid preparation tank (7) with the first overflow pipe (17) and first emptying valve (14), urea liquid preparation tank (7) connects heating steam source (38) and dissolves water source (39), the first temperature measuring set (16) is set in urea liquid preparation tank (7), liquid level gauge (12) and agitator (8), agitator (8) connects agitator motor (9), the upper termination funnel (10) of urea liquid preparation tank (7), the outlet that is positioned at urea liquid preparation tank (7) bottom is provided with the first circulating pump (18), exudate through the first circulating pump (18) is divided into two-way, one road tieback is to urea liquid preparation tank (7), another road is connected to memory module (2).
3. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 2, it is characterized in that, described memory module (2) comprises the urea liquid storage tank (21) with the second overflow pipe (23) and second emptying valve (24), another road of described the first circulating pump (18) is connected to urea liquid storage tank (21), urea liquid storage tank (21) connects heating steam source (38), the second temperature measuring set (22) is set in urea liquid storage tank (21), the outlet that is positioned at the bottom of urea liquid storage tank (21) is provided with the second circulating pump (26), exudate through the second circulating pump (26) is connected to dilution module (3).
4. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 3, it is characterized in that, described dilution module (3) comprises blender (27), the described exudate through the second circulating pump (26) is connected to an entrance of blender (27), another entrance of blender (27) connects dilution water source (40), and the outlet of blender (27) is connected to distribution and computation module (4).
5. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 4, it is characterized in that, described distribution and computation module (4) comprises flowmeter (31) and the control valve (32) of many group series connection, according to flow, the fluid of blender (27) need to be divided into multichannel.
6. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 5, it is characterized in that, described compressed air module (5) comprises compressed air main valve (33) and the atomizing air control valve (34) that is connected to successively compressed air source (41), and the compressed air main valve of compressed air (33) of compressed air source (41) inputs to corresponding spray gun (37) by the front atomizing air control valve (34) of each spray gun (37).
7. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 6, it is characterized in that, described spray gun (37) comprises parallel aqueous suction pipes (3705) and air hose (3707), inner sleeve (3702) is enclosed within on aqueous suction pipes (3705) and air hose (3707), outer tube (3701) is enclosed within on inner sleeve (3702), outer tube (3701) pipe wall hollow and with one deck interlayer of not sealing (3720) parallel with its tube wall, interlayer (3720) is divided into internal layer (3721) and outer (3722) (nothing 3721 in figure by the hollow tube wall of outer tube (3701), 3722), internal layer (3721) connects cooling water water inlet interface (3704), outer (3722) connect cooling water water outlet mouthpiece (3703), aqueous suction pipes (3705) and air hose (3707) are all connected to the nozzle (3713) of taper.
8. the low-consumption high-efficiency SNCR denitrification apparatus for CFBB according to claim 7, is characterized in that, described spray gun (37) is vertically installed on the horizontal flue of CFBB.
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|---|---|---|---|
| CN201210187700.7A CN102688688B (en) | 2012-06-07 | 2012-06-07 | SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers |
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|---|---|---|---|
| CN201210187700.7A CN102688688B (en) | 2012-06-07 | 2012-06-07 | SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers |
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| CN102688688A CN102688688A (en) | 2012-09-26 |
| CN102688688B true CN102688688B (en) | 2014-03-12 |
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Families Citing this family (8)
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| CN103861445A (en) * | 2014-01-16 | 2014-06-18 | 山西平朔煤矸石发电有限责任公司 | Safe SNCR (Selective Non-Catalytic Reduction) denitration device and denitration method thereof |
| CN105509081B (en) * | 2016-01-28 | 2017-11-17 | 杜梦凡 | Spray ammonia denitrating system and denitrating technique in large-sized boiler high-temperature flue gas region |
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN105944546B (en) * | 2016-07-08 | 2019-02-19 | 安徽电气工程职业技术学院 | Denitrating system and denitration in the stove technique in circulating fluid bed boiler |
| CN107051169A (en) * | 2017-04-07 | 2017-08-18 | 大唐环境产业集团股份有限公司 | A kind of SNCR denitration device |
| CN107096366A (en) * | 2017-06-20 | 2017-08-29 | 佛山市三水新明珠建陶工业有限公司 | Gravity flow SNCR denitration system |
| CN108443870B (en) * | 2018-03-22 | 2019-12-20 | 黄陵矿业煤矸石发电有限公司 | Automatic urea solution feeding optimization device and method for circulating fluidized bed unit |
| CN114011232A (en) * | 2021-12-06 | 2022-02-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Process for separating solid particles from flue gas by using vaporous central barrel cyclone separator |
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| CN102274687B (en) * | 2011-08-15 | 2013-05-22 | 浙江大学 | SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as reducting agent |
| CN202606021U (en) * | 2012-06-07 | 2012-12-19 | 中国华能集团清洁能源技术研究院有限公司 | Denitration device for circulating fluidized bed boiler |
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