CN206846777U - A kind of system for reducing gas fired-boiler NOx emission - Google Patents
A kind of system for reducing gas fired-boiler NOx emission Download PDFInfo
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- CN206846777U CN206846777U CN201720691726.3U CN201720691726U CN206846777U CN 206846777 U CN206846777 U CN 206846777U CN 201720691726 U CN201720691726 U CN 201720691726U CN 206846777 U CN206846777 U CN 206846777U
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Abstract
The utility model discloses a kind of system for reducing gas fired-boiler NOx emission, including gas fired-boiler, fuel heating humidifier and smoke washer, fuel heating humidifier to be connected with smoke washer；Fuel heating humidifier is connected with gas fired-boiler；Smoke washer is connected with gas fired-boiler, flue gas caused by gas fired-boiler is passed through the bottom of smoke washer after heat utilization, fuel heating humidifier includes being arranged on the hot water atomized device at the top of it and the upper heater being arranged in below hot water atomized device, lower heater, and fuel gas warming and humidifying process is divided into three steps：The spraying of fuel gas, form air-water mixture；Air-water mixture and the water evaporation in hot water heat exchange heating simultaneously mixture；Later gas is humidified to heat up with hot water heat exchange, fuel gas warming and humidifying process is realized in the same apparatus, consequently facilitating control adds the water of fuel, the carrying of fuel gas outlet water droplet is avoided, and the condensation of wet fuel in subsequent pipeline and in the burner can be avoided.
Description
Technical field
Gas fired-boiler technical field is the utility model is related to, specifically a kind of reduction gas fired-boiler NOx emission is
System.
Background technology
Using natural gas, either other clean fuel gas produce steam or hot water to gas fired-boiler as fuel, are widely used in work
Industry steam, resident's heat supply etc..As Environmental Protection in China requires more and more higher, also more and more higher is required to the NOx emission of gas fired-boiler.
By taking Beijing as an example, for gas fired-boiler NOx emission from 2017, newly constructed boiler need to be less than 30mg/Nm3.Conventional boiler-burner
It is difficult to reach this standard, on the basis of using low NOx combusting technologies such as premixed combustion, fractional combustions, it is necessary to using such as cigarette
The technology auxiliary such as gas recycling reduces NOx emission.Although flue gas recirculation can aid in reducing NOx emission, its shortcoming is also very
Substantially：Flue gas recirculation blower fan increases power consumption；Substantial amounts of flue gas recirculation influences combustion stability；With the increase of flue gas recirculation amount,
Drop NOx effect can reduce.
Utility model content
The purpose of this utility model is to provide a kind of system for reducing gas fired-boiler NOx emission, can reduce NOx and arrange
Put, while do not reduce the efficiency of boiler.
To reach above-mentioned purpose, the technical solution of the utility model is：
One kind reduces gas fired-boiler NOx emission system, including gas fired-boiler, fuel heating humidifier and smoke washer,
The gas fired-boiler includes air feed conduit and fuel gas feeding pipe, and the fuel heating humidifier is arranged on gas fired-boiler
Fuel gas feeding pipe on, the flue gas of gas fired-boiler burning discharge is passed through the bottom of the smoke washer, its feature
It is, the fuel heating humidifier includes the hot water atomized device set close to its top and is arranged in described hot water atomized
Device bottom and the heater for extending to the fuel heating humidifier bottom, wherein, the bottom of the heater sets water inlet
Mouthful, top sets discharge outlet；The top of the fuel heating humidifier sets fuel gas supply mouth, and the fuel gas supply mouth
It is arranged on the top of the hot water atomized device；Part hot water in the hot water supply line of the gas fired-boiler is described in
The water inlet of hot water atomized device；The water at low temperature of discharge is supplied to the top of the smoke washer, institute at the top of the heater
The hot water for stating the discharge of smoke washer bottom is supplied to the water inlet of the heater base.
Preferably, the air feed conduit of the gas fired-boiler is provided with blower fan, and air leads under the driving of the blower fan
Enter in the gas fired-boiler.
Preferably, the gas fired-boiler is hot-water boiler or steam boiler, including boiler feedwater pipeline and hot water supply
Pipeline, sets current divider I on the hot water supply line, and the hot water in the hot water supply line shunts rear portion through current divider I
Divide and be supplied to the fuel heating humidifier.
Preferably, the supply channel of the hot water atomized device is provided with water pump, the gas fired-boiler hot water supply line
In hot water through current divider I shunting after, under the driving of the water pump be supplied to the hot water atomized device water inlet.
Preferably, the heater at least two in the fuel heating humidifier, an epimere for setting top add
Hot device, another is to be arranged on the hypomere heater below the epimere heater；Also, the spraying in the smoke washer
Device at least two, one is to be arranged on the low temperature water spraying device at the top of the smoke washer, and another is to be arranged on
Medium temperature water spraying device in the middle part of the smoke washer.
Preferably, the hot water of the smoke washer bottom discharge heats after the boosting of circulating pump I supplied to the hypomere
The water inlet at device bottom.
Preferably, the middle warm water of discharge is divided into two-way by current divider II at the top of the hypomere heater, is circulating all the way
Supplied to the medium temperature water spraying device in the middle part of the smoke washer, driving of the another way in circulating pump III under the driving of pump II
The water inlet of the epimere heater base is supplied to down, and the water at low temperature discharged at the top of the epimere heater is circulating pump IV's
Driving is lower supplied to the low temperature water spraying device at the top of the smoke washer.
Preferably, the bottom of the fuel heating humidifier sets discharge outlet, and the discharge outlet passes through pipeline and the hot water
The inlet communication of atomising device, and water circulating pump is set on connecting pipeline therebetween.To adjust the fuel heating
Quantity of circulating water inside humidifier, and being sufficiently humidified so as to for the epimere heater and hypomere heater outer surface can be ensured, increase
Heat and mass area.
Technical principle of the present utility model is：By improving the humidity of fuel, that is, increase the water vapour content in fuel, it is real
Now reduce the purpose of NOx emission.The utility model improve wetness of fuel principle be：First toward water is sprayed into fuel, now due to
Fuel temperature is relatively low, and the water of penetrating mainly exists with liquid, and into fuel, fuel is formed with water for only a small amount of water potential evaporation
Gas-liquid mixture；Then the gas-liquid mixture of fuel and water is heated, after mixture is heated, liquid water gradually evaporates into gas
Phase so that wetness of fuel temperature improves, and the steam partial pressure in fuel also steps up, until the water evaporating completely in fuel,
The gas-liquid mixture of fuel and water is completely transformed into gas phase, further heats so that humidified later fuel turns into overheat
Gas.The evaporation process of the mixture of fuel and water is the process of an alternating temperature evaporation, with the raising of wetness of fuel, vapor
Partial pressure improves, and the phase transition temperature of water also steps up.The alternating temperature evaporation process only needs the heat source can of lower temperature real
It is existing.In utility model, there is provided the waste heat recovery that the heat needed for fuel humidification is discharged fume from boiler tail.
Further, the utility model fuel warming and humidifying process uses fuel gas and the descending method of mist mixture,
With heat exchanger countercurrent flow during descending, during mixture is descending, the drop in mixture is in heat exchanger surface shape
Into moisture film, the area of mass transfer is increased.Also cause water smoke there is no evaporating completely if gas-liquid mixture is descending, can also be easy to
The bottom of heating humidifier is efficiently separated, while delivers to boiler, Ke Yi great from fuel heating humidifier bottom by wet fuel
The big distance for shortening conveying, reduce the risk of fuel gas condensation.Further, cloth in fuel heating humidifier in the utility model
The heat exchanger put is divided into two sections, and epimere heat exchange temperature bottom, water-carrying capacity are small, and hypomere heat exchange temperature is high, water-carrying capacity is big.Its
Principle is that fuel is during warming and humidifying, with the raising of fuel temperature humidity, the caloric receptivity needed for units of fuel temperature rise
Also bigger, this requires that fuel is big in high temperature section caloric receptivity, and low-temperature zone caloric receptivity is small, in order to effectively reduce fuel warming and humidifying
The irreversible loss of device, the utility model use two-part heater.
Compared with the existing technology, the system of the present utility model for reducing gas fired-boiler NOx emission, its technical characterstic mainly exist
In：
1) by the humidification of fuel, the calorific value of fuel is reduced, to reduce the NOx emission of gas fired-boiler.Fuel humidification drop NOx
Effect to be much better than the humidification or flue gas recirculation of air.
2) innovative fuel heating humidifier, using the method for spraying+indirect heat exchange+overheat, the advantage is that：It is easy to control
The water of fuel is added, avoids the carrying of fuel gas outlet water droplet；The process integration of the humidification and fuel gas of fuel gas is dropped, and must
The overheat wanted can avoid the condensation of wet fuel in subsequent pipeline and in the burner.
3) indirect heat exchanger in fuel heating humidifier is exchanged heat using two-part, and the hot water flow of two sections of heat exchangers is not
Together, high temperature section water-carrying capacity is big, and low-temperature zone water-carrying capacity is low, is matched with the endothermic curve with fuel warming and humidifying process, reduces combustion
Expect the irreversible loss of warming and humidifying process.
4) fuel humidifies humidifier using gas from top entrance, bottom discharge, and hot water enters from bottom, top is discharged
Countercurrent heat exchange method, fuel is at top after spraying, and the part droplet in steam water interface is in the middle part of the process of flowing downward
Divide and form moisture film in heat exchanger surface, accelerate the heat and mass of gas side；Gas-liquid mixture flows downward so that gas-liquid separation is more held
Easily, even if fuel gas outlet also has a small amount of droplet not have evaporating completely, also it is easy to nature and is separated in bottom with fuel gas.
5) fuel warming and humidifying realizes alternating temperature evaporation, and its thermal source is reclaimed using flue gas afterbody low temperature exhaust heat, is fired reducing
While gas boiler NOx emission, Low Temperature Thermal recycling is realized, can not only reduce pollutant emission, moreover it is possible in certain journey
The overall thermal efficiency of system is improved on degree.
Brief description of the drawings
Fig. 1 is the schematic diagram of reduction gas fired-boiler NOx emission system of the present utility model.
Embodiment
For the purpose of this utility model, technical scheme and advantage is more clearly understood, with reference to embodiment to this reality
Be described in further detail with new, following examples be to it is of the present utility model explanation and the utility model is not limited to
Following examples.
The system of the present utility model for reducing gas fired-boiler NOx emission, refer to Fig. 1.Reduction combustion gas of the present utility model
Emission of NOx of boiler system, including gas fired-boiler 1, fuel heating humidifier 2, smoke washer 3, gas fired-boiler 1 supply including air
To pipeline and fuel gas feeding pipe, the configured blower fan 4 on air feed conduit of air is passed through in gas fired-boiler 1, fuel
It is passed through after the configured fuel heating humidifier 2 on fuel gas feeding pipe of gas in gas fired-boiler 1, air and fuel gas are firing
Mixed combustion in gas boiler 1, flue gas is passed through in gas fired-boiler 1 after heat utilization through smoke-exhaust pipeline caused by gas fired-boiler 1
The bottom of smoke washer 3.Flue gas in flue gas scrubber 3 with sprayed from the top of smoke washer 3 under water at low temperature and from flue gas
The direct counter current contacting of middle warm water under the spray of the middle part of washer 3, flue gas cool during up, and temperature is washed after reducing from flue gas
Wash the top of device 3 to discharge, be sent into chimney afterwards.Supplied to the water at low temperature at the top of smoke washer 3, sprayed from the top of smoke washer 3
After entering, heated up by flue gas, with being continued traveling downwardly after being mixed supplied to the middle warm water at the middle part of flue gas scrubber 3, by flue gas
Further heat temperature raising, discharged from the bottom of smoke washer 3.The hot water of the bottom of smoke washer 3 discharge boosts through circulating pump I 7
The bottom of fuel heating humidifier 2 is sent to afterwards, and hot water is arranged after hypomere heater 11 from the middle part of fuel heating humidifier 2
Go out, the medium temperature backwater is divided into two-way by current divider II 14, sends fuel heating back to after circulating pump III 9 pressurizes all the way and adds
Wet device 2, another way send the middle part of smoke washer 3 back to after the boosting of circulating pump II 6.Return to the medium temperature of fuel heating humidifier 2
Water is discharged after epimere heat exchanger 12 from top, sends the top of flue gas scrubber 3, structure back to after circulating pump IV 5 boosts
Into loop.
Gas fired-boiler 1 is hot-water boiler or steam boiler, including boiler feedwater pipeline and hot water supply line, and hot water supplies
To answer and current divider 13 is set on pipeline, for the hot water in hot water supply line after the shunting of current divider 13, a part is supplied to heat user,
Another part is supplied to fuel heating humidifier 2 under the driving of water pump 8.
Fuel heating humidifier 2 includes the hot water atomized device 15 set close to its top and is arranged in hot water atomized dress
Put 15 bottoms and extend to the epimere heater 12 and hypomere heater 11 of the bottom of fuel heating humidifier 2.Hot water atomized device
15 inlet pipeline and the hot water supply pipeline connection of water pump 8.The bottom of epimere heater 12 sets inlet pipeline, and the water inlet
Pipeline connects with circulating pump III 9 outlet pipeline, and the top of epimere heater 12 sets discharge pipe line, and the discharge pipe line with
Circulating pump IV 5 inlet pipeline connection.The bottom of hypomere heater 11 sets inlet pipeline, and the inlet pipeline and circulating pump I
7 outlet pipeline connection, the top setting discharge pipe line of hypomere heater 11, and the discharge pipe line enter with current divider II's 14
Water lines connect.The top of fuel heating humidifier 2 sets fuel gas supply mouth, and fuel gas supply mouth is arranged on hot water atomized dress
Put 15 top.
Discharge outlet, the discharge outlet and the Inlet water pipeline connection of water pump 10, water are set in the bottom of fuel heating humidifier 2
Pump 10 goes out saliva on the inlet communication with hot water atomized device 15.Fuel heating humidifier 2 can be adjusted by water pump 10
Inner loop water, to ensure that epimere heater 12 and the surface of hypomere heater 11 are sufficiently humidified so as to, increase heat and mass face
Product.
After fuel gas incoming fuel heating humidifier 2, at the top of fuel heating humidifier 2 with passing through hot water atomized device 15
The atomizing humidifying performance water that sprays into of nozzle directly contact, form the mixture of fuel gas and water smoke, the mixing of fuel gas and water smoke
Thing continues traveling downwardly, successively by the hot water indirectly heat in heater 12, heater 11 to improve the temperature of mixture, in fuel gas
In heated process, the water smoke evaporation in fuel gas, fuel gas humidity temperature improves simultaneously, from the bottom of fuel heating humidifier 2
Portion is sent into gas fired-boiler after leaving.Water smoke in the easily controllable fuel gas of this humidification method of heating humidifier 2 carries, spray
Enter degree that the water in fuel humidifies according to needed for fuel to control, also allow for realizing fuel gas in the same apparatus in addition
Overheat, the fuel gas after humidification is an overheat fuel gas, it is possible to prevente effectively from wet fuel gas is in subsequent pipeline
Condense, and the mode that fuel gas is discharged from the bottom of heating humidifier 2 so that fuel gas is from heating humidifier 2 and gas fired-boiler 1
Between pipeline greatly shorten, reduce the risk of fuel condensation.
The hot water that the humidification water of incoming fuel heating humidifier 2 is produced from gas fired-boiler, as shown in figure 1, gas fired-boiler
The hot water produced distributes a small gangs of by current divider 13, and fuel heating humidifier 2 is sent to after water pump 8 pressurizes.Gas-fired boiler
The flue gas of stove 1 is sent into the bottom of smoke washer 3, in smoke washer 3, with the water at low temperature under the spray at the top of smoke washer 3
And the direct counter current contacting of middle warm water under the spray of middle part, flue gas cool during up, temperature is reduced later from smoke washer 3
Top is discharged, and is sent into chimney.Supplied to the water at low temperature at the top of smoke washer 3, after being sprayed into from the top of smoke washer 3, quilt
Flue gas heats up, and with being continued traveling downwardly after being mixed from the middle warm water supplied to the middle part of flue gas scrubber 3, is further added by flue gas
Heat heating, is discharged from the bottom of smoke washer 3.The hot water of the bottom of smoke washer 3 discharge is sent to after the boosting of circulating pump I 7
Fuel heating humidifier bottom；Medium temperature/the low-temperature return water in the middle part of fuel heating humidifier and top is sent after circulating pump boosting
The middle part and top of smoke washer 2 are gone back to, forms loop.
In the present embodiment, the hot water of fuel heating humidifier 2 comes from smoke washer, it is necessary to explanation, fuel
The recuperation of heat that hot water needed for heating humidifier comes from boiler exhaust gas produces hot water, and exhaust heat recovery had produced the mode of hot water both
The smoke washer described in the present embodiment can be used, can also be realized by dividing wall type heat exchanger.Need further exist for explanation
It is that the hot water of fuel heating humidifier 2 can be from other low-temperature heat sources, such as hot water caused by solar energy etc..
So far, the present embodiment is described in detail combined accompanying drawing.According to above description, those skilled in the art
Should it is a kind of to the utility model reduce gas fired-boiler NOx emission system have clear understanding.
Claims (8)
1. one kind reduces gas fired-boiler NOx emission system, including gas fired-boiler, fuel heating humidifier and smoke washer, institute
Stating gas fired-boiler includes air feed conduit and fuel gas feeding pipe, and the fuel heating humidifier is arranged on gas fired-boiler
On fuel gas feeding pipe, the flue gas of the gas fired-boiler burning discharge is passed through the bottom of the smoke washer, and its feature exists
In,
The fuel heating humidifier includes the hot water atomized device set close to its top and is arranged in described hot water atomized
Device bottom and the heater for extending to the fuel heating humidifier bottom, wherein, the bottom of the heater sets water inlet
Mouthful, top sets discharge outlet；The top of the fuel heating humidifier sets fuel gas supply mouth, and the fuel gas supply mouth
It is arranged on the top of the hot water atomized device；
Part hot water in the hot water supply line of the gas fired-boiler is supplied to the water inlet of the hot water atomized device；
The water at low temperature of discharge is supplied to the top of the smoke washer, the smoke washer bottom row at the top of the heater
The hot water gone out is supplied to the water inlet of the heater base.
2. reduction gas fired-boiler NOx emission system according to claim 1, it is characterised in that the sky of the gas fired-boiler
Gas feeding pipe is provided with blower fan, and air is passed through under the driving of the blower fan in the gas fired-boiler.
3. reduction gas fired-boiler NOx emission system according to claim 1, it is characterised in that the gas fired-boiler is heat
Homogeneous solution-type reactor or steam boiler, including boiler feedwater pipeline and hot water supply line, shunting is set on the hot water supply line
Device I, the hot water in the hot water supply line is after the current divider I shunting, partly supplied to the fuel heating humidifier.
4. reduction gas fired-boiler NOx emission system according to claim 3, it is characterised in that the hot water atomized device
Supply channel be provided with water pump, the hot water in the gas fired-boiler hot water supply line is after the shunting of current divider I, in the water
The water inlet of the hot water atomized device is supplied under the driving of pump.
5. reduction gas fired-boiler NOx emission system according to claim 1, it is characterised in that the fuel warming and humidifying
Heater at least two in device, an epimere heater for setting top, another is heated to be arranged on the epimere
Hypomere heater below device；Also, the sprayer unit at least two in the smoke washer, one described to be arranged on
Low temperature water spraying device at the top of smoke washer, another is to be arranged on the medium temperature water spray dress in the middle part of the smoke washer
Put.
6. reduction gas fired-boiler NOx emission system according to claim 5, it is characterised in that the smoke washer bottom
The hot water of portion's discharge is supplied to the water inlet of the hypomere heater base after the boosting of circulating pump I.
7. reduction gas fired-boiler NOx emission system according to claim 6, it is characterised in that the hypomere heater top
The middle warm water of portion's discharge is divided into two-way by current divider II, is supplied to the smoke washer under the driving of circulating pump II all the way
The medium temperature water spraying device at middle part, another way are supplied to the water inlet of the epimere heater base under circulating pump III driving
Mouthful, the water at low temperature of discharge is supplied at the top of the smoke washer under circulating pump IV driving at the top of the epimere heater
Low temperature water spraying device.
8. reduction gas fired-boiler NOx emission system according to claim 7, it is characterised in that the fuel warming and humidifying
The bottom of device sets discharge outlet, and the discharge outlet is by pipeline and the inlet communication of the hot water atomized device, and therebetween
Connecting pipeline on water circulating pump is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720691726.3U CN206846777U (en) | 2017-06-15 | 2017-06-15 | A kind of system for reducing gas fired-boiler NOx emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720691726.3U CN206846777U (en) | 2017-06-15 | 2017-06-15 | A kind of system for reducing gas fired-boiler NOx emission |
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| Publication Number | Publication Date |
|---|---|
| CN206846777U true CN206846777U (en) | 2018-01-05 |
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ID=60800493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720691726.3U Active CN206846777U (en) | 2017-06-15 | 2017-06-15 | A kind of system for reducing gas fired-boiler NOx emission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206846777U (en) |
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2017
- 2017-06-15 CN CN201720691726.3U patent/CN206846777U/en active Active
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