CN204345682U - A kind of boiler flue gas treatment system with SCR denitration function - Google Patents
A kind of boiler flue gas treatment system with SCR denitration function Download PDFInfo
- Publication number
- CN204345682U CN204345682U CN201420812842.2U CN201420812842U CN204345682U CN 204345682 U CN204345682 U CN 204345682U CN 201420812842 U CN201420812842 U CN 201420812842U CN 204345682 U CN204345682 U CN 204345682U
- Authority
- CN
- China
- Prior art keywords
- subordinate
- air preheater
- economizer
- higher level
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The utility model relates to a kind of boiler flue gas treatment system with SCR denitration function, it comprises the flue that top is connected with body of heater, higher level's economizer, higher level's air preheater, SCR device, subordinate's economizer and subordinate's air preheater are installed in flue successively, higher level's economizer and subordinate's economizer all arrange two cover entrance header and outlet headers in flue both sides, and the outlet header of subordinate's economizer both sides is connected with the entrance header of higher level's economizer of its homonymy respectively by water route tube connector; Subordinate's air preheater is divided into subordinate's air preheater epimere and subordinate's air preheater hypomere, and the heat exchanging pipe of subordinate's air preheater hypomere is enamel pipe and caliber is greater than the heat exchanging pipe of subordinate's air preheater epimere and higher level's air preheater.The utility model has that spatial arrangement is reasonable, structure is simple, transformation is convenient and denitration and the effective advantage of waste heat recovery.
Description
Technical field
The utility model relates to the fume treatment field of boiler, specifically a kind of boiler flue gas treatment system with SCR denitration function.
Background technology
China is coal production state maximum in the world and country of consumption, and coal still accounts for significant proportion in the energy resource structure of China, and the energy consumption structure based on coal causes China's nitride to pollute the most important reason be on the rise.For many years in China's primary energy total quantity consumed, coal accounts for more than 75%, and within period quite long from now on, the energy supply based on coal can not change with consumption general layout.The NOx of power plant emission is current topmost NOx source, and the impact of discharged nitrous oxides is appeared suddenly day by day, and denitrating flue gas is imperative.
In numerous denitration technologies, selective catalytic reduction (SCR) is that denitration efficiency is the highest, denitration technology the most ripe.Current boiler major part cannot meet the NOx emission standard of national regulation, and because the space of existing boiler flue is taken by the flue gas waste heat recovery apparatus such as economizer and air preheater, installing SCR device additional must transform existing boiler flue structure.But SCR device is very strict to temperature requirement, and the flue gas after SCR easily produces the erosions such as ammonium salt and sticky object in experience low-temperature zone, can corrode or block the pipeline of waste-heat recovery device.In sum, how to carry out reasonable reformation to make SCR device play denitration function and to ensure fume afterheat high efficiente callback to existing boiler flue, be the technical barrier being badly in need of at present solving.
Utility model content
The technical problems to be solved in the utility model is to provide that a kind of spatial arrangement is reasonable, structure is simple, transformation is convenient and can ensure the boiler flue gas treatment system with SCR denitration function of denitration and waste heat recovery effect.
For solving the problems of the technologies described above, the boiler flue gas treatment system with SCR denitration function of the present utility model comprises the flue that top is connected with body of heater, its design feature is that described flue extends straight down and install higher level's economizer successively from top to bottom in flue, higher level's air preheater, SCR device, subordinate's economizer and subordinate's air preheater, described higher level's economizer and subordinate's economizer all arrange two cover entrance header and outlet headers in flue both sides, the outlet header of subordinate's economizer both sides is connected with the entrance header of higher level's economizer of its homonymy respectively by water route tube connector, described subordinate air preheater is divided into subordinate's air preheater epimere and subordinate's air preheater hypomere, described higher level's air preheater, subordinate's air preheater epimere and subordinate's air preheater hypomere are box type structure and the fresh air passage of three is ganged up successively by the air connecting line being arranged on flue outside, and the heat exchanging pipe of subordinate's air preheater hypomere is enamel pipe and caliber is greater than the heat exchanging pipe of subordinate's air preheater epimere and higher level's air preheater.
Adopt said structure, SCR device is arranged on high temperature section, meet its requirement to temperature, two-stage economizer and air preheater are set, while ensureing denitration effect, do not affect the recycling of fume afterheat; Economizer arranges two cover entrance header and outlet headers, forms the path of two Inlet and outlet waters, decreases the space that economizer takies, for SCR device vacates enough installing spaces under the prerequisite ensureing heat recovery effect; The air preheater hypomere being positioned at tail end low-temperature zone adopts enamel pipe and caliber increase, effectively prevent ammonium salt corrosion and bonding phenomenon, ensure that the stability of equipment.
Described higher level's economizer and subordinate's economizer include the multiple unit pipes rows be intervally arranged along the longitudinal direction, each unit pipes row is equally divided into two groups, left and right and two groups of unit pipes arrange the entrance header and the outlet header that are communicated with both sides respectively, two groups of unit pipes row cross arrangement.Adopt the arrangement of this kind of pipe row unit, fully can absorb the heat of flue gas, ensure heat transfer effect.
Each unit pipes row includes many bodys being intervally arranged from top to bottom and each body is concatenated into the water-flowing path forming meander-like successively by bend pipe, the body being positioned at the superiors is connected with the outlet header of higher level's economizer, is positioned at undermost body and is connected with the entrance header of higher level's economizer.Unit pipes row be made up of many bodys and bend pipe, and structure is simple, easy to assembly and can ensure the heat transfer effect of in the vertical direction.
The body being positioned at the superiors in the unit pipes row of described higher level's economizer is light pipe, all the other bodys are finned tube with heat exchange fin, and light pipe and bend pipe all arrange anti-abrasion cover.In the pipe row of higher level's economizer, only the body of the superiors is light pipe, and for arranging scuff-resistant coating, all the other adopt finned tube, effectively can increase heat exchange area, improves heat transfer effect.The windward side of light pipe and the connecting portion of bend pipe are damageable zone, and what arrange that anti-abrasion cover can reduce that flue gas arranges pipe at damageable zone washes away, the service life of extension tube row.
Described air connecting line is provided with expansion joint.Arrange expansion joint can avoid pipeline because of expand with heat and contract with cold effect produce distortion connecting portion is pullled damage, ensure that the sealing effectiveness of pipeline.
Described higher level's air preheater, subordinate's air preheater epimere and subordinate air preheater hypomere by multiple exhaust gases passes gang up successively be connected, unit bobbin carriage composition that air duct gangs up connection successively.Arrange multiple unit bobbin carriage, structure is simple, facilitates the repair and maintenance installing transformation and later stage.
The utility model has that spatial arrangement is reasonable, structure is simple, transformation is convenient and denitration and the effective advantage of waste heat recovery.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is overall structure schematic diagram of the present utility model;
Fig. 2 is the side-looking structural representation of Fig. 1;
Fig. 3 is the structural representation of two economizers in the utility model;
Fig. 4 is the structural representation arranged for a pipe of the entrance header and outlet header that connect wherein side of the utility model higher level economizer;
Fig. 5 is the structural representation arranged for a pipe of the entrance header and outlet header that connect opposite side of the utility model higher level economizer.
Detailed description of the invention
With reference to accompanying drawing, the boiler flue gas treatment system with SCR denitration function of the present utility model comprises the flue 1 that top is connected with body of heater, and flue 1 extends straight down and install higher level's economizer 3, higher level's air preheater 4, SCR device 2, subordinate's economizer 6 and subordinate's air preheater successively from top to bottom in flue 1.As shown in Figure 3, higher level's economizer 3 and subordinate's economizer 6 all arrange two cover entrance header 8 and outlet headers 9 in flue 1 both sides, and the outlet header 9 of subordinate's economizer 6 both sides is connected with the entrance header 8 of higher level's economizer 3 of its homonymy respectively by water route tube connector 5.Wherein entrance header 8 is communicated with by unit pipes row 31 with outlet header 9, higher level's economizer 3 and subordinate's economizer 6 include the multiple unit pipes rows 31 be intervally arranged along the longitudinal direction, each unit pipes row 31 is equally divided into two groups, left and right and the entrance headers 8 that two groups of unit pipes rows 31 are communicated with both sides respectively arrange 31 cross arrangement with outlet header 9, two groups of unit pipes.Each unit pipes row 31 includes the many bodys 311 that are intervally arranged from top to bottom and each body 311 is concatenated into the water-flowing path forming meander-like successively by bend pipe 312, the body 311 being positioned at the superiors is connected with outlet header 9, is positioned at undermost body 311 and is connected with entrance header 8.
Wherein, the body 311 being positioned at the superiors in the unit pipes of higher level's economizer 3 row 31 is light pipe, all the other bodys 311 are finned tube with heat exchange fin, and light pipe and bend pipe all arrange anti-abrasion cover.Due to higher level's economizer washing away directly in the face of flue gas, the structure that its superiors are set to light pipe is to install anti-abrasion cover or other flue gas flows backwards or shoe.Remaining adopts the structure of finned tube, can absorb flue gas heat to greatest extent and reduce the space that economizer takies, for SCR device vacates enough installing spaces.
With reference to accompanying drawing, subordinate's air preheater is divided into subordinate's air preheater epimere 71 and subordinate's air preheater hypomere 72, and higher level's air preheater 4, subordinate's air preheater epimere 71 and subordinate's air preheater hypomere 72 are box type structure and the fresh air passage of three is ganged up successively by the air connecting line 10 being arranged on flue 1 outside.Wherein, because flue about 1 temperature spread is comparatively large, air connecting line 10 is subject to expanding with heat and contract with cold effect, easily produces distortion, thus can pull connecting portion and cause leaking gas, and therefore, air connecting line 10 is installed expansion joint 11, can avoid above-mentioned phenomenon.Because subordinate's air preheater hypomere 72 is positioned at the low-temperature space of flue 1 lowermost end, flue gas easily produces the corrosion such as ammonium salt or cementability material at low-temperature space after SCR denitration, can corrosion be caused to pipeline or cause blocking, in order to avoid this situation, increase the caliber of this section heat exchanging pipe, simultaneously piping material also adopts the material of corrosion resistance, and namely the heat exchanging pipe of subordinate's air preheater hypomere 72 is enamel pipe and caliber is greater than the heat exchanging pipe of subordinate's air preheater epimere 71 and higher level's air preheater 4.
With reference to accompanying drawing, higher level's air preheater 4, subordinate's air preheater epimere 71 and subordinate air preheater hypomere 72 by multiple exhaust gases passes gang up successively be connected, unit bobbin carriage 12 that air duct gangs up connection successively forms.Aforesaid box type structure refers to that heat exchanger is made up of casing and inner heat exchanging pipe, and heat exchanging pipe forms a path, and cabinets cavity forms a path, and according to the difference of mounting means, two paths can be elected to be exhaust gases passes and fresh air passage respectively.In addition, consider easily for installation and maintenance, in the utility model, the air preheater of each position forms by multiple unit bobbin carriage.
In sum, the utility model is not limited to above-mentioned detailed description of the invention.Those skilled in the art, under the prerequisite not departing from spirit and scope of the present utility model, can do some changes and modification.Protection domain of the present utility model should be as the criterion with claim of the present utility model.
Claims (6)
1. one kind has the boiler flue gas treatment system of SCR denitration function, comprise the flue (1) that top is connected with body of heater, it is characterized in that described flue (1) extends straight down and install higher level's economizer (3) successively from top to bottom in flue (1), higher level's air preheater (4), SCR device (2), subordinate's economizer (6) and subordinate's air preheater, described higher level's economizer (3) and subordinate's economizer (6) all arrange two cover entrance headers (8) and outlet header (9) in flue (1) both sides, the outlet header (9) of subordinate's economizer (6) both sides is connected with the entrance header (8) of higher level's economizer (3) of its homonymy respectively by water route tube connector (5), described subordinate air preheater is divided into subordinate's air preheater epimere (71) and subordinate's air preheater hypomere (72), described higher level's air preheater (4), subordinate's air preheater epimere (71) and subordinate's air preheater hypomere (72) are box type structure and the fresh air passage of three is ganged up successively by the air connecting line (10) being arranged on flue (1) outside, and the heat exchanging pipe of subordinate's air preheater hypomere (72) is enamel pipe and caliber is greater than the heat exchanging pipe of subordinate's air preheater epimere (71) and higher level's air preheater (4).
2. there is the boiler flue gas treatment system of SCR denitration function as claimed in claim 1, it is characterized in that described higher level's economizer (3) and subordinate's economizer (6) include multiple unit pipes row (31) be intervally arranged along the longitudinal direction, each unit pipes row (31) is equally divided into two groups, left and right and two groups of unit pipes row (31) are communicated with the entrance header (8) of both sides and outlet header (9) respectively, two groups of unit pipes row (31) cross arrangement.
3. there is the boiler flue gas treatment system of SCR denitration function as claimed in claim 2, it is characterized in that each unit pipes row (31) includes the many bodys (311) that are intervally arranged from top to bottom and each body (311) is concatenated into the water-flowing path forming meander-like successively by bend pipe (312), the body (311) being positioned at the superiors is connected with outlet header (9), is positioned at undermost body (311) and is connected with entrance header (8).
4. there is the boiler flue gas treatment system of SCR denitration function as claimed in claim 3, the body (311) that it is characterized in that being positioned at the superiors in unit pipes row (31) of described higher level's economizer (3) is light pipe, all the other bodys (311) are finned tube with heat exchange fin, and light pipe and bend pipe all arrange anti-abrasion cover.
5. there is the boiler flue gas treatment system of SCR denitration function as claimed in claim 1, it is characterized in that described air connecting line (10) is provided with expansion joint (11).
6. the boiler flue gas treatment system with SCR denitration function according to any one of claim 1-5, it is characterized in that described higher level's air preheater (4), subordinate's air preheater epimere (71) and subordinate's air preheater hypomere (72) by multiple exhaust gases passes gang up successively be connected, unit bobbin carriage (12) that air duct gangs up connection successively composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420812842.2U CN204345682U (en) | 2014-12-22 | 2014-12-22 | A kind of boiler flue gas treatment system with SCR denitration function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420812842.2U CN204345682U (en) | 2014-12-22 | 2014-12-22 | A kind of boiler flue gas treatment system with SCR denitration function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204345682U true CN204345682U (en) | 2015-05-20 |
Family
ID=53228947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420812842.2U Active CN204345682U (en) | 2014-12-22 | 2014-12-22 | A kind of boiler flue gas treatment system with SCR denitration function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204345682U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439798A (en) * | 2016-08-31 | 2017-02-22 | 江苏汇能锅炉有限公司 | Coal economizer for circulating fluid bed coal-fired boiler |
| CN108087851A (en) * | 2018-02-06 | 2018-05-29 | 上海宁松热能环境工程有限公司 | A kind of binary channels waste heat boiler for preventing SCR denitration ammonium salt crystallization |
| CN110296389A (en) * | 2019-06-30 | 2019-10-01 | 无锡华光锅炉股份有限公司 | A kind of economizer arragement construction |
-
2014
- 2014-12-22 CN CN201420812842.2U patent/CN204345682U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439798A (en) * | 2016-08-31 | 2017-02-22 | 江苏汇能锅炉有限公司 | Coal economizer for circulating fluid bed coal-fired boiler |
| CN106439798B (en) * | 2016-08-31 | 2018-12-18 | 江苏汇能锅炉有限公司 | Circulating fluid-bed coal-burning boiler economizer |
| CN108087851A (en) * | 2018-02-06 | 2018-05-29 | 上海宁松热能环境工程有限公司 | A kind of binary channels waste heat boiler for preventing SCR denitration ammonium salt crystallization |
| CN110296389A (en) * | 2019-06-30 | 2019-10-01 | 无锡华光锅炉股份有限公司 | A kind of economizer arragement construction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202203971U (en) | Discharged smoke afterheat recycling and emission reduction comprehensive application system for coal-fired boiler in thermal power plant | |
| CN103884209A (en) | Split combined type flue heat exchanger | |
| CN102305413A (en) | Exhaust gas waste heat recovery and emission reduction comprehensive application system for coal-fired boiler in thermal power plant | |
| CN204345682U (en) | A kind of boiler flue gas treatment system with SCR denitration function | |
| CN203464242U (en) | High-medium-low temperature overall economizer for coal-fired boiler | |
| CN202885607U (en) | H-shaped finned tube energy saver used for industrial and civil boilers | |
| CN204730234U (en) | Steam type airheater | |
| CN204005923U (en) | A kind of boiler waste heat recovery system | |
| CN100520268C (en) | Fume-fume hot pipe heater exchanger for fume desulphurization in heat-engine plant | |
| CN104100957B (en) | A kind of boiler waste heat recovery system | |
| CN205316294U (en) | Removable low -level (stack -gas) economizer of high leakproofness single tube | |
| CN104896991A (en) | Abrasion-proof rectifying device for H-shaped finned tube of low-temperature coal economizer | |
| CN205119011U (en) | Low -level (stack -gas) economizer with wear resisting structure | |
| CN105021060A (en) | Natural convection cooling tower type air cooling system | |
| CN203115976U (en) | Novel low-temperature coal economizer | |
| CN203823735U (en) | Coal economizer | |
| CN202902241U (en) | Zinc coated thermal treatment furnace heat recovery boiler | |
| CN202328127U (en) | Smoke waste heat recycling device for coke oven | |
| CN203258629U (en) | Formaldehyde plant flue gas waste heat recovery system | |
| CN205317055U (en) | Finned tube diaphragm type low -level (stack -gas) economizer | |
| CN202188627U (en) | Safe and energy-saving angle pipe hot-water boiler | |
| CN205245810U (en) | Burning furnace smoke waste heat's device is forged in recovery | |
| CN209876890U (en) | Combined coal economizer | |
| CN104501414A (en) | Condensing secondary heat exchanger and heat exchanger group | |
| CN204268698U (en) | Heat-exchange tube and comprise the condensing heat exchanger of this heat-exchange tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |