CN109764695A - A kind of condensing heat exchanger and method for gas fired-boiler denitrating flue gas - Google Patents
A kind of condensing heat exchanger and method for gas fired-boiler denitrating flue gas Download PDFInfo
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- CN109764695A CN109764695A CN201811550924.3A CN201811550924A CN109764695A CN 109764695 A CN109764695 A CN 109764695A CN 201811550924 A CN201811550924 A CN 201811550924A CN 109764695 A CN109764695 A CN 109764695A
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- flue gas
- steam generator
- heat exchanger
- hydrogenperoxide steam
- boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a kind of condensing heat exchanger and method for gas fired-boiler denitrating flue gas, which includes flue gas condensing heat-exchange system and hydrogenperoxide steam generator spraying system；Flue gas condensing heat-exchange system is made of several finned coil heat exchangers；Hydrogenperoxide steam generator spraying system includes several hydrogenperoxide steam generator delivery pipes, and several hydrogenperoxide steam generator nozzles in each hydrogenperoxide steam generator delivery pipe；Every layer of the upper and lower of finned coil heat exchanger is arranged with hydrogenperoxide steam generator delivery pipe.This method comprises: the tail flue gas of gas fired-boiler enters condensing heat exchanger, exchange heat in heat-transfer surface and working medium, while the hydrogenperoxide steam generator spraying system in heat exchanger sprays hydrogenperoxide steam generator on heat-transfer surface, by the NO in reaction oxidation flue gas, is there is Fe2(MoO4)3Under catalysis, which is more than 80% to the oxygenation efficiency of NO in flue gas.The present invention can make the NO of gas fired-boilerxConcentration of emission is brought down below 30mg/Nm3, moreover it is possible to vapor and its latent heat and sensible heat in recovered flue gas.
Description
Technical field
The invention belongs to environment-friendly engineering technical fields, and in particular to a kind of condensing for gas fired-boiler denitrating flue gas changes
Hot device and method, the NO suitable for industrial combustion gas boiler smokexRemoving and recycling to vapor and its latent heat and sensible heat.
Background technique
Natural gas does not have SO substantially in combustion2It is generated with exhaust gas dust, but due to ignition temperature height, Yi Sheng
At NOx(based on heating power type).Beijing provides the NO of newly-built gas fired-boiler at presentxConcentration of emission must not be higher than 30mg/Nm3；And
Low nitrogen transformation will be carried out to existing gas fired-boiler, make its NOxDischarge amount is lower than 80mg/Nm3.Other national cities are also pushing away successively
Out than discharge standard more harsh in the past, therefore develop reduction gas fired-boiler NOxThe technology of discharge is of great significance.
In addition to this, the exhaust gas temperature of current industrial combustion gas boiler is higher, is generally all higher than 100 DEG C, this is not only wasted
A large amount of tow taste heats and vapor latent heat, but also the vapor in flue gas is lost in vain.Using condensing heat exchanger come
Exhaust gas temperature is reduced, both can be with the latent heat and sensible heat in recovered flue gas, also available a large amount of water resource.
Summary of the invention
The purpose of the present invention is to provide a kind of condensing heat exchangers and method for gas fired-boiler denitrating flue gas, pass through
It installs the pipeline of injection hydrogenperoxide steam generator additional in heat exchanger, and realizes in heat exchange tube fin on piece supported catalyst in flue gas
The large scale of NO removes.While the part vapor in flue gas and its latent heat and sensible heat are also recycled.
The present invention adopts the following technical scheme that realize:
A kind of condensing heat exchanger for gas fired-boiler denitrating flue gas, including flue gas condensing heat-exchange system and hydrogen peroxide
Solution spraying system；Wherein,
Flue gas condensing heat-exchange system is made of several finned coil heat exchangers；
Hydrogenperoxide steam generator spraying system includes several hydrogenperoxide steam generator delivery pipes, and is uniformly arranged on each peroxide
Change several hydrogenperoxide steam generator nozzles in hydrogen solution delivery pipe；
Every layer of the upper and lower of finned coil heat exchanger is arranged with hydrogenperoxide steam generator delivery pipe.
A further improvement of the present invention lies in that load has catalyst on finned coil heat exchanger.
A further improvement of the present invention lies in that catalyst is chosen for Fe2(MoO4)3。
A method of for gas fired-boiler denitrating flue gas, this method is based on above-mentioned a kind of for gas fired-boiler denitrating flue gas
Condensing heat exchanger, include the following steps:
Boiler tail flue gas enters condensing heat exchanger, carries out hot friendship by finned coil heat exchanger and working medium
It changes, so that flue-gas temperature is reduced to~60 DEG C, the working medium with flue gas heat exchange is the fuel liquefied natural gas or pot of gas fired-boiler
Furnace water supply, is discharged into atmosphere through chimney after；
Meanwhile hydrogenperoxide steam generator is by the peroxide in hydrogenperoxide steam generator delivery pipe and hydrogenperoxide steam generator delivery pipe
Change hydrogen solution nozzle to be ejected on finned coil heat exchanger.
A further improvement of the present invention lies in that the concentration for the hydrogenperoxide steam generator that hydrogenperoxide steam generator spraying system is sprayed
For 1 mol/L, pass through 3H on heat-transfer surface2O2+2NO→2HNO3+2H2This reaction of O aoxidizes the NO in flue gas, at 60-110 DEG C
It is more than 80% to the oxygenation efficiency of NO in flue gas under the conditions of the reaction is existing for the catalyst, reacts the HNO of generation3It can be molten to cold
In the solution of condensate or hydrogen peroxide.
A further improvement of the present invention lies in that this method further includes by condensing hot air furnace in heat exchanger, deacidified to it,
The water supply of supplement boiler is used for after purified treatment.
The present invention has following beneficial technical effect:
A kind of condensing heat exchanger for gas fired-boiler denitrating flue gas provided by the invention, the heat exchanger pass through several bands
The heat exchange of boiler tail flue gas working medium may be implemented in the coil heat exchanger of fin, meanwhile, by having hydrogenperoxide steam generator
The hydrogenperoxide steam generator delivery pipe of nozzle sprays finned coil heat exchanger, realizes hydrogenperoxide steam generator to oxidation reaction
Product HNO3Solution absorption and realize to NO in flue gasxRemoving.
A kind of method for gas fired-boiler denitrating flue gas provided by the invention, passes through H2O2Oxidation and condensed water to NO
With hydrogenperoxide steam generator to oxidation reaction product HNO3Solution absorption and realize to NO in flue gasxRemoving.Also, by
Supported catalyst can allow NO in flue gas on the fin of heat exchanger tubexRemoval efficiency be more than 80%, the NO in final boiler smokexIt is dense
Degree is lower than 30mg/Nm3.It simultaneously can also be with a large amount of vapor in recovered flue gas.
Detailed description of the invention
Fig. 1 is structure principle chart of the invention.
In figure: 1 is finned coil heat exchanger, and 2 be hydrogenperoxide steam generator delivery pipe, and 3 spray for hydrogenperoxide steam generator
Mouth.
Fig. 2 is the structural schematic diagram of finned coil heat exchanger.
Fig. 3 is the structural schematic diagram of hydrogenperoxide steam generator spraying system.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail
As shown in Figure 1, a kind of condensing heat exchanger for gas fired-boiler denitrating flue gas provided by the invention, including heat exchange
System and hydrogenperoxide steam generator spraying system.
Heat-exchange system is made of finned coil heat exchanger 1, and the structure of every layer of finned coil heat exchanger 1 is such as
Shown in Fig. 2, wherein load has catalyst Fe on the fin of finned coil heat exchanger 12(MoO4)3。
Hydrogenperoxide steam generator spraying system is made of several hydrogenperoxide steam generator delivery pipes 2, layering and every layer of band fin
Coil heat exchanger 1 be alternately arranged, have several hydrogenperoxide steam generator nozzles 3 in every hydrogenperoxide steam generator delivery pipe 2.
A kind of condensing heat exchanger for gas fired-boiler denitrating flue gas provided by the invention, in condensing recovery flue gas
While vapor and its latent heat and sensible heat, can remove be more than in flue gas 80% NOx。
As shown in Figure 1, a kind of method for gas fired-boiler denitrating flue gas provided by the invention, includes the following steps:
(~110 DEG C) of boiler tail flue gas enter condensing heat exchanger, by finned coil heat exchanger (1) 1 with
Working medium exchanges heat, and so that smoke temperature is reduced to~60 DEG C, is discharged into atmosphere through chimney after.Heat-exchange working medium is chosen for the fuel of boiler
The water supply of LNG or boiler, the part vapor during heat exchange in flue gas are condensed in heat exchanger surface.
Hydrogenperoxide steam generator is ejected by hydrogenperoxide steam generator delivery pipe 2 by hydrogenperoxide steam generator nozzle 3 finned
On coil heat exchanger and coupled heat exchange fin；The concentration of hydrogenperoxide steam generator is 1mol/L.Pass through 3H2O2+2NO→
2HNO3+2H2This reaction of O aoxidizes the NO in flue gas, reacts the HNO of generation3It can the molten solution for arriving condensed water or hydrogen peroxide
In.
The present invention also by the recycling of condensed water in heat exchanger, deacidifies to it, is used for supplement boiler after purified treatment
Water supply.
A kind of method for gas fired-boiler denitrating flue gas provided by the invention, by spraying peroxide to condensing heat-exchange surface
The NO in flue gas can be aoxidized by changing hydrogen solution, meet requirement of the condensing heat exchanger of the invention announced to NO removal efficiency.
In short, by spraying hydrogenperoxide steam generator and supported catalyst can on heat exchanger fin on heat exchange surface
Will be more than that 80% NO oxidation generates HNO soluble easily in water in gas fired-boiler flue gas3；Deacidify again to the condensed water of recycling,
Purified treatment may be implemented to NO in flue gasxRemoving and fixation, the NO in final boiler smokexConcentration is lower than 30mg/Nm3。
It should be understood that the embodiment be merely to illustrate the present invention and without limiting it.It should also be understood that those skilled in the art
Member can make various changes or equivalent replacement to the present invention and be regarded as without departing from the principle of the present invention
In the protection scope of invention.
Claims (6)
1. a kind of condensing heat exchanger for gas fired-boiler denitrating flue gas, which is characterized in that including flue gas condensing heat-exchange system
With hydrogenperoxide steam generator spraying system；Wherein,
Flue gas condensing heat-exchange system is made of several finned coil heat exchangers (1)；
Hydrogenperoxide steam generator spraying system includes several hydrogenperoxide steam generator delivery pipes (2), and is uniformly arranged on each peroxide
Change several hydrogenperoxide steam generator nozzles (3) on hydrogen solution delivery pipe (2)；
Every layer of the upper and lower of finned coil heat exchanger (1) is arranged with hydrogenperoxide steam generator delivery pipe (2).
2. a kind of condensing heat exchanger for gas fired-boiler denitrating flue gas according to claim 1, which is characterized in that
Load has catalyst on finned coil heat exchanger (1).
3. a kind of condensing heat exchanger for gas fired-boiler denitrating flue gas according to claim 2, which is characterized in that urge
Agent is chosen for Fe2(MoO4)3。
4. a kind of method for gas fired-boiler denitrating flue gas, which is characterized in that this method is based on any in claims 1 to 3
A kind of condensing heat exchanger for gas fired-boiler denitrating flue gas described in, includes the following steps:
Boiler tail flue gas enters condensing heat exchanger, carries out heat exchange by finned coil heat exchanger (1) and working medium,
So that flue-gas temperature is reduced to~60 DEG C, the working medium with flue gas heat exchange is that the fuel liquefied natural gas of gas fired-boiler or boiler are given
Water is discharged into atmosphere through chimney after；
Meanwhile hydrogenperoxide steam generator is by the mistake on hydrogenperoxide steam generator delivery pipe (2) and hydrogenperoxide steam generator delivery pipe (2)
Hydrogen peroxide solution nozzle (3) is ejected on finned coil heat exchanger (1).
5. a kind of method for gas fired-boiler denitrating flue gas according to claim 4, which is characterized in that hydrogen peroxide is molten
The concentration for the hydrogenperoxide steam generator that liquid spraying system is sprayed is 1mol/L, passes through 3H on heat-transfer surface2O2+2NO→2HNO3+
2H2This reaction of O aoxidizes the NO in flue gas, to the oxygen of NO in flue gas under the conditions of the 60-110 DEG C of reaction is existing for catalyst
Rate is more than 80%, reacts the HNO of generation3It can be molten into the solution of condensed water or hydrogen peroxide.
6. a kind of method for gas fired-boiler denitrating flue gas according to claim 4, which is characterized in that this method is also wrapped
Include condensing hot air furnace in heat exchanger deacidifies to it, after purified treatment be used for supplement boiler water supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550924.3A CN109764695B (en) | 2018-12-18 | 2018-12-18 | Condensing heat exchanger and method for denitration of flue gas of gas-fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550924.3A CN109764695B (en) | 2018-12-18 | 2018-12-18 | Condensing heat exchanger and method for denitration of flue gas of gas-fired boiler |
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| CN109764695A true CN109764695A (en) | 2019-05-17 |
| CN109764695B CN109764695B (en) | 2021-01-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110773219A (en) * | 2019-10-30 | 2020-02-11 | 中国海洋大学 | photo-Fenton desulfurization and denitrification catalyst and preparation method thereof |
| CN111828997A (en) * | 2020-07-13 | 2020-10-27 | 汤宝宝 | Gas boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773219A (en) * | 2019-10-30 | 2020-02-11 | 中国海洋大学 | photo-Fenton desulfurization and denitrification catalyst and preparation method thereof |
| CN111828997A (en) * | 2020-07-13 | 2020-10-27 | 汤宝宝 | Gas boiler |
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| CN109764695B (en) | 2021-01-19 |
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