CN109464899A - A kind of SNCR denitration system applied to miniature boiler - Google Patents
A kind of SNCR denitration system applied to miniature boiler Download PDFInfo
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- CN109464899A CN109464899A CN201811438213.7A CN201811438213A CN109464899A CN 109464899 A CN109464899 A CN 109464899A CN 201811438213 A CN201811438213 A CN 201811438213A CN 109464899 A CN109464899 A CN 109464899A
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- boiler
- open fire
- endpiece
- reducing agent
- feed liquor
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The present invention relates to a kind of SNCR denitration systems applied to miniature boiler, it is related to gas denitrifying technology field, and denitration in the stove reaction zone temperature fluctuation it is larger will lead to, spray into furnace in reducing agent tend not to react under suitable temperature window with NOx, also denitration efficiency is resulted in substantially reduce.This programme includes boiler, is equipped with open fire area in boiler；Reducing agent feed liquor part is equipped on boiler peripheral wall, open fire area successively includes open fire leading portion and open fire endpiece along flow of flue gas direction, and reducing agent feed liquor part is connected into open fire endpiece；Boiler is externally provided with fluid reservoir, air accumulator, and urea liquid is stored in fluid reservoir, and reducing agent feed liquor part is connected with fluid reservoir, and reducing agent feed liquor part is connected with air accumulator.By the way that urea is sprayed into open fire endpiece, to improve denitration efficiency.
Description
Technical field
The present invention relates to gas denitrifying technology fields, more particularly, to a kind of SNCR denitration system applied to miniature boiler
System.
Background technique
Under the action of selective non-catalytic reduction (SNCR) refers to no catalyst, in " temperature window " for being suitble to denitration reaction
Nitrogen oxides in flue gas is reduced to harmless nitrogen and water by interior penetrating reducing agent.The technology generally uses spray ammonia, urine in furnace
As reducing agent reduction NOx, NOx reaction of the reducing agent only and in flue gas is not reacted generally with oxygen for element or hydrogen propylhomoserin.
Wherein, since the technique does not have to catalyst, it is therefore necessary to reducing agent be added at high-temperature region (suitable temperature window).
But it is directed to middle-size and small-size boiler, internal temperature fluctuation is bigger, causes denitration in the stove reaction zone (to furnace
It is interior injection reducing agent region) temperature fluctuation it is also bigger.Reason is that 1, mediumand smallscale industrial boilers are generally used for individually
Factory, steam consumption depend on the running load in factory's unit interval, and operate load with the change of working time section,
Always changing；For example, the possible factory needs to catch up with goods this period in the morning, and required quantity of steam is caused to increase greatly
Add, thus boiler continues high load work, internal temperature also can be higher；Waiting until afternoon or dull season, steam demand amount reduces,
Boiler starts low-load work, and internal temperature will be relatively low.2, large-sized boiler is generally used for thermal power plant or entire industrial park
Steam supply, then the load of each period daily can be more stable, also results in the temperature change in boiler more steady
It is fixed.
And denitration in the stove reaction zone temperature fluctuation it is larger will lead to, spray into furnace in reducing agent tend not to suitable
It is reacted under temperature window with NOx, also denitration efficiency is resulted in substantially reduce.
Summary of the invention
The object of the present invention is to provide a kind of SNCR denitration systems applied to miniature boiler, by the way that urea is sprayed into open fire
Endpiece, to improve denitration efficiency.
Foregoing invention purpose of the invention has the technical scheme that
A kind of SNCR denitration system applied to miniature boiler, including boiler, boiler is interior to be equipped with open fire area；On the boiler peripheral wall
It is equipped with reducing agent feed liquor part, open fire area successively includes open fire leading portion and open fire endpiece, reducing agent feed liquor along flow of flue gas direction
Part is connected into open fire endpiece；Boiler is externally provided with fluid reservoir, air accumulator, and urea liquid, reducing agent feed liquor part are stored in fluid reservoir
It is connected with fluid reservoir, reducing agent feed liquor part is connected with air accumulator.
By using above-mentioned technical proposal, reducing agent pot denitration in the stove suitable temperature between 850-1100 DEG C.?
Miniature boiler loads in change procedure, because flue gas, along boiler flow process, temperature will be reduced persistently, and reduced speed
In the trend of first increases and then decreases, that is to say, that beginning (i.e. open fire of minimum, the most constant region of temperature change in flue gas
Area) and boiler endpiece.And the endpiece temperature of boiler has been significantly reduced under SNCR denitration reaction temperature, therefore, boiler
Endpiece is not suitable for the denitration reaction of reducing agent.And the temperature in open fire area generally changes between 900-1300 DEG C, slightly above restores
The suitable reactions temperature of agent, so, reaction zone of the open fire area as miniature boiler SNCR is the most suitable.
Wherein it is worth noting that, when ammonium hydroxide makees reducing agent, ammonium hydroxide sprays into open fire area in temperature-rise period, often
It is burnt up by open fire with oxygen, leads to NH3It is difficult and reaction of nitrogen oxides.And urea is when making reducing agent, as long as urea is sprayed onto
Open fire endpiece, then NH3The amount being burned off will substantially reduce, because can first carry out decomposition reaction after urea sprays into open fire endpiece, with
Generate NH3, and after the completion of decomposing, NH3Open fire endpiece is often had been detached from, the not region of open fire, and urine in boiler is proceeded to
Element is heated up in decomposable process in open fire endpiece, and can generally rise to complete at this time in denitration reaction temperature range
Heating and the NH not being burned off3It can just be reacted with nitrogen oxides.
Therefore, the denitration efficiency of miniature boiler can be improved by spraying into urea in open fire endpiece.
It more in addition is to not only increase the utilization rate of urea, and reduce ammonia and escape after the ammonia that reacts away is more
Ease.
The present invention is further arranged to: the endless tube equipped with several head and the tail connections in the open fire endpiece, several endless tubes
Diameter gradually become smaller, and several endless tubes are coaxially set；Several spray heads being arranged upward are communicated on endless tube peripheral wall；Also
For former agent feed liquor part in a tubular form and equipped with several, every reducing agent feed liquor part correspondence is connected to an endless tube；All reducing agents into
Liquid part is connected to fluid reservoir, and all reducing agent feed liquor parts are connected to air accumulator, is all provided on every reducing agent feed liquor part useful
In the control gentle opening and closing valve into boiler of urea.
By using above-mentioned technical proposal, the heating surfaces such as flame impingement water-cooling wall, lead to the feelings of hot-spot in order to prevent
The generation of condition, that is, it is evenly distributed in order to make each heating surface of boiler be heated, heating surface coking is prevented, then flame kernel need to maintain
At the central axes in entire open fire area.So the temperature in entire open fire endpiece can be low in intermediate height, surrounding, lower end height, upper end
It is low, characteristic, then in several endless tubes, environment temperature locating for the endless tube of outermost is minimum, environment locating for most interior endless tube
Temperature highest, that is to say, that the bigger endless tube of diameter, locating for environment temperature it is higher.
And due to the higher suitable temperature in denitration reaction of the range of temperature of the open fire endpiece in miniature boiler, then may be used
By the setting of above-mentioned multiple groups endless tube, alleviates open fire endpiece range of temperature and mismatch asking for denitration reaction suitable temperature section
Topic, concrete operations principle are as follows:
When miniature boiler high load works, i.e., the mean temperature of open fire endpiece is higher than the suitable temperature section of denitration reaction, make
The minimum endless tube of local environment temperature starts to work, sprays urea liquid, with the temperature after the urea heating that the full extent, furthers
With the suitable temperature section of denitration reaction；It works in miniature boiler low-load, i.e. the mean temperature of open fire endpiece adapts to denitration
When the suitable temperature section of reaction, the highest endless tube of local environment temperature is set to start to work, spray urea liquid, in open fire endpiece
Temperature adapt to the suitable temperature section of denitration reaction under the premise of, guarantee the heating efficiency of urea as far as possible, prevent urea liter
It is warm inadequate, the NH for causing urea to decomposite3Lower than the suitable temperature section of denitration reaction.
The present invention is further arranged to: the smaller then height of the loop diameter is lower.
By using above-mentioned technical proposal, temperature in entire open fire endpiece can in it is intermediate it is high, surrounding is low, lower end is high, on
Hold it is low, characteristic especially allowed at original lower endless tube of local environment temperature then by looking into several endless tubes in the presence of height
In higher height, that is, the temperature difference between several endless tubes is expanded, with the variation adapted in the bigger temperature range of boiler.
The present invention is further arranged to: the boiler exit gas mouth is communicated with flue, has connected on flue for will pass through
The partial fume for crossing economizer and air preheater is transmitted back to the muffler of open fire endpiece, and muffler is equipped with circulation air pump, muffler
Be communicated with cooling spray gun close to boiler one end, cooling spray gun pierces into boiler, be equipped on cooling spray gun for control flue gas into
Control valve in boiler.
By using above-mentioned technical proposal, muffler can pass the part low-temperature flue gas for having already passed through economizer and air preheater
Defeated time open fire endpiece, with the temperature for reducing open fire endpiece.The operation is mainly used for when miniature boiler high load works, with
To a greater extent, the suitable temperature section of temperature and denitration reaction after the urea that furthers heating.
The present invention is further arranged to: the cooling spray gun is connected to the endless tube for being located at outmost turns into one end of open fire endpiece
Top.
By using above-mentioned technical proposal, it is therefore intended that, make cooling spray gun mainly for minimum in local environment temperature
Endless tube, because reducing the minimum endless tube of local environment temperature is the most directly, effectively, after the urea that can further heating is decomposed
The mode in the suitable temperature section of temperature and denitration reaction.
The present invention is further arranged to: the boiler exit gas mouth is communicated with flue, has connected on flue and has saved for that will pass through
The partial fume of coal device and air preheater is transmitted back to the muffler of open fire endpiece, and muffler is equipped with circulation air pump, and muffler is close
Boiler one end is communicated with cooling spray gun, and cooling spray gun pierces into boiler；Boiler is externally provided with water tank, and cooling spray gun is located at boiler outer one
It is communicated with water-supply-pipe between end and water tank, water-delivery pump is installed on water-supply-pipe；It is equipped on cooling spray gun for controlling water and cigarette
Gas proceeds to the control valve in boiler.
By using above-mentioned technical proposal, extraneous cold water is sprayed into open fire endpiece by cooling spray gun, it is appropriate to carry out
Cooling.The operation is mainly used for when miniature boiler high load works, with the temperature after the urea heating that a greater extent, furthers
The suitable temperature section of degree and denitration reaction.
The present invention is further arranged to: the boiler is externally provided with water tank, and cooling spray gun, cooling spray are equipped on boiler peripheral wall
Rifle position is equipped with water-delivery pump on water-supply-pipe in being communicated with water-supply-pipe outside boiler between one end and water tank；It is equipped on cooling spray gun
The control valve proceeded in boiler for controlling water.
By using above-mentioned technical proposal, low-temperature flue gas and extraneous cold water are sprayed into open fire endpiece by cooling spray gun,
To carry out cooling appropriate.The operation is mainly used for when miniature boiler high load works, with the urea liter that a greater extent, furthers
The suitable temperature section of temperature and denitration reaction after temperature.
And during cold water and low-temperature flue gas spray into open fire endpiece, flue gas can mix in cold water, to be atomized penetrating open fire
The water of endpiece, to increase cold water in the heat exchange efficiency of open fire endpiece.
The present invention is further arranged to: the spray head periphery is enclosed with protection sleeve pipe.
By using above-mentioned technical proposal, high temperature resistant, corrosion-resistant, anti abrasive alloy material system is can be selected in protection sleeve pipe
At extending its service life for protecting the spray head in boiler.
In conclusion advantageous effects of the invention are as follows:
1. in the present solution, by the way that urea is sprayed into open fire endpiece, to improve denitration efficiency；
2. in the present solution, in the following manner, the urea that furthers as far as possible heating decompose after temperature and denitration reaction suitable temperature
Section is spent, to improve denitration efficiency --- several endless tubes for being in varying environment temperature are provided with, and according to small-sized filtering
Loading condition, operate endless tube appropriate.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment of the present invention one.
Fig. 2 is the schematic diagram of the embodiment of the present invention two.
Fig. 3 is the schematic diagram of the embodiment of the present invention three.
In figure, 1, boiler；11, economizer；12, air preheater；13, flue；2, open fire area；21, open fire leading portion；22, open fire
Endpiece；23, endless tube；24, spray head；25, reducing agent feed liquor part；26, valve is opened and closed；3, water tank；4, fluid reservoir；41, Pump for giving-out；42,
Liquid main pipe out；43, go out liquid branch pipe；5, air accumulator；51, air outlet pump；52, outlet main pipe；53, going out gas branch pipe；6, cooling spray gun；
61, control valve；62, muffler；63, air pump is recycled；64, water-supply-pipe；65, water-delivery pump.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment one is a kind of SNCR denitration system applied to miniature boiler disclosed by the invention with reference to Fig. 1, including
Boiler 1, boiler 1 is interior to be equipped with open fire area 2, and open fire area 2 is the place of visible open fire in boiler 1, and open fire area 2 is along flow of flue gas direction
It successively include open fire leading portion 21 and open fire endpiece 22.
Wherein, the suitable temperature of reducing agent denitration in boiler 1 is between 850-1100 DEG C.It loads and becomes in miniature boiler 1
During change, because flue gas is along 1 flow process of boiler, temperature will be reduced persistently, and reduced speed is in first to increase to subtract afterwards
Small trend, that is to say, that minimum, the most constant region of temperature change is at the beginning (i.e. open fire area 2) and boiler 1 of flue gas
Endpiece.And the endpiece temperature of boiler 1 has been significantly reduced under SNCR denitration reaction temperature, therefore, the endpiece of boiler 1 is not suitable for
The denitration reaction of reducing agent.And the temperature in open fire area 2 generally changes between 900-1300 DEG C, slightly above reducing agent is suitable anti-
Temperature is answered, so, reaction zone of the open fire area 2 as miniature boiler 1SNCR is the most suitable.
Wherein it is worth noting that, when ammonium hydroxide makees reducing agent, ammonium hydroxide sprays into open fire area 2 in temperature-rise period, often
Through being burnt up by open fire with oxygen, lead to NH3It is difficult and reaction of nitrogen oxides.And urea is when making reducing agent, as long as urea sprays
To open fire endpiece 22, then NH3The amount being burned off will substantially reduce, because can first be decomposed after urea sprays into open fire endpiece 22
Reaction, to generate NH3, and after the completion of decomposing, NH3Open fire endpiece 22 is often had been detached from, not no open fire is proceeded in boiler 1
Region, and urea is heated up in decomposable process in open fire endpiece 22, and can generally rise to denitration reaction temperature range
NH that is interior, completing heating at this time and be not burned off3It can just be reacted with nitrogen oxides.
Therefore, the denitration efficiency of miniature boiler 1 can be improved by spraying into urea in open fire endpiece 22.
It is set in open fire endpiece 22 there are three the endless tube 23 of head and the tail connection, the diameter of three endless tubes 23 gradually becomes smaller, and several
A endless tube 23 is coaxially set, wherein the height of the smaller endless tube 23 of diameter is lower, that is, the smaller endless tube 23 of diameter is closer
Open fire front end.Several spray heads 24 being arranged upward are communicated on every 23 peripheral wall of endless tube, 24 periphery of spray head is enclosed with protection
Casing (not shown), high temperature resistant can be selected in protection sleeve pipe, corrosion-resistant, anti abrasive alloy material is made, and exists for protecting
Spray head 24 in boiler 1, extends its service life.
Be equipped with three reducing agent feed liquor parts 25 on 1 peripheral wall of boiler, reducing agent feed liquor part 25 in a tubular form, and every reducing agent
The correspondence of feed liquor part 25 is connected to an endless tube 23, and opening and closing valve 26 is mounted on every reducing agent feed liquor part 25.Boiler 1 is externally provided with
Fluid reservoir 4, air accumulator 5, fluid reservoir 4 is for storing urea liquid, and air accumulator 5 is for storing high pressure gas.Connect on fluid reservoir 4
There is one to go out liquid main pipe 42 out, Pump for giving-out 41 is installed in liquid main pipe 42 out, Pump for giving-out 41 is metering pump, is connected in liquid main pipe 42 out
There are three to go out liquid branch pipe 43 out, three go out liquid branch pipe 43 and are respectively communicated with Yu Yigen reducing agent feed liquor part 25；It has been connected on air accumulator 5
A piece outlet main pipe 52 is equipped with air outlet pump 51 in outlet main pipe 52, and air outlet pump 51 is metering pump, has connected in outlet main pipe 52
Three going out gas branch pipe 53, three going out gas branch pipe 53 are respectively communicated with Yu Yigen reducing agent feed liquor part 25.Opening and closing valve 26 can be truncated or open
It opens in the gentle entrance boiler 1 of urea, and high pressure gas mixes urea liquid, can be atomized the urea liquid sprayed from spray head 24, from
And increase the NH after urea decomposes3With the contact area of nitrogen oxides.
Wherein, it is worth noting that, heating surfaces such as flame impingement water-cooling wall in order to prevent, the case where leading to hot-spot
Occur, that is, it is evenly distributed in order to make each heating surface of boiler 1 be heated, heating surface coking is prevented, then flame kernel need to maintain entirely
At the central axes in open fire area 2.So the temperature in entire open fire endpiece 22 can be low in intermediate height, surrounding, lower end is high, upper end is low,
Characteristic, then in several endless tubes 23, environment temperature locating for the endless tube 23 of outermost and the top is minimum, most interior and bottom
Endless tube 23 locating for environment temperature highest, that is to say, that the bigger endless tube 23 of diameter, locating for environment temperature it is higher.
And due to the higher suitable temperature in denitration reaction of the range of temperature of the open fire endpiece 22 in miniature boiler 1,
Then it can alleviate 22 range of temperature of open fire endpiece by the setting of above-mentioned multiple groups endless tube 23 and mismatch denitration reaction suitable temperature
The problem of section, concrete operations principle are as follows:
When 1 high load of miniature boiler works, i.e., the mean temperature of open fire endpiece 22 is higher than the suitable temperature section of denitration reaction,
The endless tube 23 for keeping local environment temperature minimum starts to work, sprays urea liquid, after the urea heating that the full extent, furthers
The suitable temperature section of temperature and denitration reaction；It works in 1 low-load of miniature boiler, i.e. the mean temperature adaptation of open fire endpiece 22
When the suitable temperature section of denitration reaction, so that the highest endless tube 23 of local environment temperature is started to work, spray urea liquid, with
Under the premise of the temperature of open fire endpiece 22 adapts to the suitable temperature section of denitration reaction, guarantee the heating efficiency of urea as far as possible,
Prevent urea heating not enough, the NH for causing urea to decomposite3Lower than the suitable temperature section of denitration reaction.
1 gas outlet of boiler is communicated with flue 13, and a muffler 62 has been connected on flue 13, and muffler 62 is equipped with circulation
Air pump 63, muffler 62 are communicated with cooling spray gun 6 close to 1 one end of boiler, and cooling spray gun 6 pierces into boiler 1, on cooling spray gun 6
Control valve 61 is installed.The part low-temperature flue gas for having already passed through economizer 11 and air preheater 12 can be transmitted back to open fire by muffler 62
Endpiece 22, with the temperature for reducing open fire endpiece 22.The operation is mainly used for when 1 high load of miniature boiler works, with more
In big degree, the suitable temperature section of temperature and denitration reaction after the urea that furthers heating.
Moreover, cooling spray gun 6 is connected to the top for being located at the endless tube 23 of outmost turns into one end of open fire endpiece 22, purpose exists
In making cooling spray gun 6 mainly for the endless tube 23 minimum in local environment temperature, because reducing the minimum ring of local environment temperature
Pipe 23 be the most directly, it is effective, the urea that can further heating decompose after temperature and denitration reaction suitable temperature section
Mode.
The implementation principle of the present embodiment are as follows: by the way that urea is sprayed into open fire endpiece 22, to improve denitration efficiency；Meanwhile it is logical
Following two mode is crossed, the suitable temperature section of temperature and denitration reaction after the urea that furthers as far as possible heating decomposition, to mention
High denitration efficiency.First, several endless tubes 23 for being in varying environment temperature are provided with, and according to the load feelings of small-sized filtering
Condition operates endless tube 23 appropriate；Second, low-temperature flue gas is sprayed into open fire endpiece 22 by cooling spray gun 6, to carry out drop appropriate
Temperature.
Embodiment two, with reference to Fig. 2, with embodiment one only difference is that being not provided with muffler 62 and circulation air pump 63,
And it is equipped with water tank 3, water-supply-pipe 64, water-delivery pump 65.
Water tank 3 is set to outside boiler 1, and water-supply-pipe 64 is connected to cooling spray gun 6 and is located between the outer one end of boiler 1 and water tank 3, defeated
Water pump 65 is installed on water-supply-pipe 64.
The implementation principle of the present embodiment are as follows: by the way that urea is sprayed into open fire endpiece 22, to improve denitration efficiency；Meanwhile it is logical
Following two mode is crossed, the suitable temperature section of temperature and denitration reaction after the urea that furthers as far as possible heating decomposition, to mention
High denitration efficiency.First, several endless tubes 23 for being in varying environment temperature are provided with, and according to the load feelings of small-sized filtering
Condition operates endless tube 23 appropriate；Second, extraneous cold water is sprayed into open fire endpiece 22 by cooling spray gun 6, it is appropriate to carry out
Cooling.
Embodiment three only difference is that, is additionally arranged water tank 3, water-supply-pipe 64, water-delivery pump with embodiment one with reference to Fig. 3
65。
Water tank 3 is set to outside boiler 1, and water-supply-pipe 64 is connected to cooling spray gun 6 and is located between the outer one end of boiler 1 and water tank 3, defeated
Water pump 65 is installed on water-supply-pipe 64.
The implementation principle of the present embodiment are as follows: by the way that urea is sprayed into open fire endpiece 22, to improve denitration efficiency；Meanwhile it is logical
Following two mode is crossed, the suitable temperature section of temperature and denitration reaction after the urea that furthers as far as possible heating decomposition, to mention
High denitration efficiency.First, several endless tubes 23 for being in varying environment temperature are provided with, and according to the load feelings of small-sized filtering
Condition operates endless tube 23 appropriate；Second, low-temperature flue gas and extraneous cold water are sprayed into open fire endpiece 22 by cooling spray gun 6, with
Carry out cooling appropriate.
And during cold water and low-temperature flue gas spray into open fire endpiece 22, flue gas can mix in cold water, be sprayed into atomization bright
The water of rear section 22, to increase cold water in the heat exchange efficiency of open fire endpiece 22.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of SNCR denitration system applied to miniature boiler, including boiler (1), boiler (1) is interior to be equipped with open fire area (2)；Its
Be characterized in that: being equipped with reducing agent feed liquor part (25) on boiler (1) peripheral wall, open fire area (2) along flow of flue gas direction successively
Including open fire leading portion (21) and open fire endpiece (22), reducing agent feed liquor part (25) is connected into open fire endpiece (22)；Boiler (1) peripheral hardware
There are fluid reservoir (4), air accumulator (5), stores urea liquid, reducing agent feed liquor part (25) and fluid reservoir (4) phase in fluid reservoir (4)
Even, reducing agent feed liquor part (25) is connected with air accumulator (5).
2. a kind of SNCR denitration system applied to miniature boiler according to claim 1, it is characterised in that: the open fire
Endless tube (23) equipped with several head and the tail connections in endpiece (22), the diameter of several endless tubes (23) gradually become smaller, and several
Endless tube (23) is coaxially set；Several spray heads (24) being arranged upward are communicated on endless tube (23) peripheral wall；Reducing agent feed liquor part
(25) in a tubular form and equipped with several, every reducing agent feed liquor part (25) correspondence is connected to an endless tube (23)；All reducing agents
Feed liquor part (25) is connected to fluid reservoir (4), and all reducing agent feed liquor parts (25) are connected to air accumulator (5), every reducing agent
It is equipped on feed liquor part (25) for controlling the gentle opening and closing valve (26) entered in boiler (1) of urea.
3. a kind of SNCR denitration system applied to miniature boiler according to claim 2, it is characterised in that: the endless tube
(23) the smaller then height of diameter is lower.
4. a kind of SNCR denitration system applied to miniature boiler according to claim 2, it is characterised in that: the boiler
(1) gas outlet is communicated with flue (13), has been connected on flue (13) for that will have already passed through economizer (11) and air preheater (12)
Partial fume be transmitted back to the mufflers (62) of open fire endpiece (22), muffler (62) is equipped with circulation air pump (63), muffler
(62) it is communicated with cooling spray gun (6) close to boiler (1) one end, cooling spray gun (6) are pierced into boiler (1), are pacified on cooling spray gun (6)
Equipped with the control valve (61) proceeded in boiler (1) for controlling flue gas.
5. a kind of SNCR denitration system applied to miniature boiler according to claim 4, it is characterised in that: the cooling
Spray gun (6) is connected to the top for being located at the endless tube (23) of outmost turns into one end of open fire endpiece (22).
6. a kind of SNCR denitration system applied to miniature boiler according to claim 2, it is characterised in that: the boiler
(1) gas outlet is communicated with flue (13), is connected on flue (13) for that will pass through the portion of economizer (11) and air preheater (12)
The muffler (62) for dividing flue gas to be transmitted back to open fire endpiece (22), muffler (62) are equipped with circulation air pump (63), muffler (62)
It is communicated with cooling spray gun (6) close to boiler (1) one end, cooling spray gun (6) are pierced into boiler (1)；Boiler (1) is externally provided with water tank
(3), cooling spray gun (6), which are located between the outer one end of boiler (1) and water tank (3), is communicated with water-supply-pipe (64), and water-supply-pipe is pacified on (64)
Equipped with water-delivery pump (65)；It is equipped on cooling spray gun (6) for controlling water and flue gas proceeds to control valve (61) in boiler (1).
7. a kind of SNCR denitration system applied to miniature boiler according to claim 2, it is characterised in that: the boiler
(1) it is externally provided with water tank (3), is equipped with cooling spray gun (6) on boiler (1) peripheral wall, cooling spray gun (6) are located at boiler (1) outer one end
It is communicated between water tank (3) water-supply-pipe (64), water-delivery pump (65) is installed on water-supply-pipe (64)；It is installed on cooling spray gun (6)
There is the control valve (61) proceeded in boiler (1) for controlling water.
8. a kind of SNCR denitration system applied to miniature boiler according to claim 2, it is characterised in that: the spray head
(24) periphery is enclosed with protection sleeve pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811438213.7A CN109464899B (en) | 2018-11-27 | 2018-11-27 | SNCR denitration system applied to small boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811438213.7A CN109464899B (en) | 2018-11-27 | 2018-11-27 | SNCR denitration system applied to small boiler |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002029219A1 (en) * | 2000-10-04 | 2002-04-11 | Robert Bosch Gmbh | Device for producing a reducing agent/exhaust gas mixture and exhaust gas purification system |
| CN108126491A (en) * | 2018-01-24 | 2018-06-08 | 江苏德义通环保科技有限公司 | A kind of efficient NOx control method and device of biomass boiler |
| CN108151006A (en) * | 2017-12-28 | 2018-06-12 | 中国计量大学 | A kind of SNCR and flue gas recirculation for chain furnace couples denitrating system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002029219A1 (en) * | 2000-10-04 | 2002-04-11 | Robert Bosch Gmbh | Device for producing a reducing agent/exhaust gas mixture and exhaust gas purification system |
| CN108151006A (en) * | 2017-12-28 | 2018-06-12 | 中国计量大学 | A kind of SNCR and flue gas recirculation for chain furnace couples denitrating system |
| CN108126491A (en) * | 2018-01-24 | 2018-06-08 | 江苏德义通环保科技有限公司 | A kind of efficient NOx control method and device of biomass boiler |
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