CN104896495B - In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source - Google Patents
In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source Download PDFInfo
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- CN104896495B CN104896495B CN201510315955.0A CN201510315955A CN104896495B CN 104896495 B CN104896495 B CN 104896495B CN 201510315955 A CN201510315955 A CN 201510315955A CN 104896495 B CN104896495 B CN 104896495B
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- heat exchanger
- boiler
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- air compartment
- pipeloop
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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 an in-boiler flue gas heat exchange heat system providing a urea pyrolysis heat source, and belongs to the field of power station boiler flue gas denitration. The system comprises a boiler and a gas-gas heat exchanger; the gas-gas heat exchanger comprises multiple rows of a heat exchanger tube coil, an inlet wind chamber communicated with an inlet of the heat exchanger tube coil, an inlet wind chamber interface of the inlet wind chamber, an outlet wind chamber communicated with an outlet of the heat exchanger tube coil, and an outlet wind chamber interface of the outlet wind chamber; the inlet and outlet wind chamber interfaces are connected with a ventilation pipeline through expansion joints; the heat exchanger tube coil is arranged into the multiple rows in parallel between a left-side wall enclosure and a right-side wall enclosure, and is hung onto boiler hanging tube overheater tubes through a fixing device; the inlet and outlet wind chambers are fixed and arranged in a manner that the inlet and outlet wind chambers are tightly attached to a rear wall enclosure, and are composed of multiple sections of wind chambers which are connected through expansion joints in the boiler width direction; and the various sections of the wind chambers are symmetrically arranged according to the center line of the boiler. The system has the small influence on the boiler and has good heat exchanger performance, and the system overcomes the problems of heat exchanger dust deposition and obstruction, which are resulted from a high-dust flue gas, of a conventional shell and tube type heat exchanger arranged outside a boiler.
Description
Technical field
The invention belongs to flue gas in power station boiler denitration field, more particularly to a kind of offer denitrification reducing agent urea pyrolysis thermal source
Stove in gas-gas heat exchanger.
Background technology
Carbamide is adopted by power plant more and more as denitrification reducing agent.More conventional urea pyrolysis method in current engineering
Technique is that cold (heat) First air of air or boiler is heated to 600 DEG C or so as urea pyrolysis by heater or heat exchanger
Thermal source.
Heater generally adopts electrical heating or burner to heat；Heat exchanger be then using high temperature flue-gas from boiler heat air or
Cold (heat) First air of boiler.For energy-conservation purpose, heat exchanger technology is increasingly being applied to denitrating flue gas urea pyrolysis neck
Domain.
Patent documentation：Notification number CN202609955U, Chinese utility model patent prospectus propose a kind of denitration
With urea pyrolysis Ammonia Process device, heat exchanger is set in boiler exterior, according to diagram, heat exchanger structure pattern is arranged horizontally
Shell-and-tube heat exchanger, from boiler draw flue gas inflow heat exchanger shell heating tube bundle in air, for SCR denitration reducing agent
Urea pyrolysis；Its defect is：Even if soot blower is mounted with inside heat exchanger, but as the boiler smoke drawn is due to containing highly concentrated
The flue dust of degree can cause heat exchanger dust stratification, block and affect air heating.Notification number CN203824376U, is in notification number
Horizontal heat exchanger is modified to the pipe shell type heat exchange of vertical by the improvement that heat exchanger is carried out on the basis of CN202609955U
Structure, tube bank in circulation high dust concentration flue gas shell air, though this arrangement can slow down tube bank in dust stratification,
Blocking, but high concentration flue dust blockage problem can not be solved at all and affect heat exchange.
Patent documentation：Publication No. CN103191640A, Chinese invention patent application prospectus propose a kind of SCR and take off
Nitre reducing agent urea pyrolysis thermal source supply method and device, arrange heat exchanger in boiler smoke region, and the First air of heat is heated
For SCR denitration reducing agent urea pyrolysis, the structural shape of heat exchanger is not specified.
Hinge structure is arranged in the simple and easy to do of the heat exchanger outside boiler, is arranged in heat exchanger difficulty in boiler more
Height, prior art also tend to the simple imagination for only generally proposing arrangement heat exchanger in a stove, there are no what is implemented
Scheme, because which has two notable difficult problems not being addressed always：
1) impact of the gas-gas heat exchanger to boiler, heat exchanger are arranged in boiler, will necessarily cause significant impact to boiler,
First is the impact of boiler configuration aspects itself, is on the other hand exactly the impact to original running environment in boiler, such as to boiler
Impact of efficiency and expansion thermal stress etc..
2) hinge structure is arranged in the heat exchanger outside boiler, and boiler internal running environment is complicated, how complicated at this
Ensure in environment that the superperformance of gas-gas heat exchanger is even more a difficult problem.
The content of the invention
It is an object of the invention to：A kind of hot heat-exchange system of inner flue gas of the stove of pyrolysis thermal source of supplying urea is proposed, to boiler
Impact it is little and heat exchange property is good, and overcome the shell-and-tube heat exchanger arranged outside conventional stove due to exchanging heat caused by high cloud of dust gas
Device dust stratification, blockage problem.
The object of the invention is realized by following technical proposals：
A kind of hot heat-exchange system of inner flue gas of the stove of pyrolysis thermal source of supplying urea, including boiler and gas-gas heat exchanger, the gas
Gas heat exchanger includes some row's heat exchanger pipeloops, the import air compartment and its import air compartment interface with heat exchanger pipeloop inlet communication,
With the outlet air compartment and its outlet air compartment interface of Tube Sheet of Heat Exchanger circle outlet, the import and export air compartment interface is by expansion joint
It is connected with ventilation shaft, the heat exchanger pipeloop, and passes through to arranged in parallel into some rows between the bag wall of right side in left side bag wall
Fixing device lodge boiler hanging pipe superheater pipe on, the heat exchanger pipeloop by Tube Sheet of Heat Exchanger after boiler bag wall into
Horizontal-extending and be bent to form pipeloop to return on perpendicular on partition wall direction, Tube Sheet of Heat Exchanger is from after boiler between the band steel of bag wall
Pass in the import and export air compartment, and Tube Sheet of Heat Exchanger is being bent to form fork configuration at the import and export air compartment, institute
Bag wall fixed and arranged after import and export air compartment is close to is stated, and is connected upwardly through expansion joint in boiler width side by some sections of air compartments
Constitute, each section of air compartment is arranged symmetrically by boiler centrage.
Alternatively, the heat exchanger pipeloop is provided with shoe near mid-board one end.
In such scheme, erosive wear of the flue gas to gas-gas heat exchanger is reduced.
Alternatively, the heat exchanger pipeloop is integrally in nearly " Y " font.
Alternatively, the Tube Sheet of Heat Exchanger of the heat exchanger pipeloop is bent to form fork configuration at the import and export air compartment
Part and horizontal plane angle be 10 °～90 °.
In such scheme, differential expansion of the heat exchanger pipeloop along boiler for deeply direction is minimized.
Alternatively, pipe clamp is additionally provided with the heat exchanger pipeloop and fixes its Tube Sheet of Heat Exchanger for bending back and forth.
Alternatively, the gas-gas heat exchanger is arranged in boiler tail vertical shaft low temperature superheater or low-temperature reheater region.
In such scheme, heat exchanger is arranged at boiler rear steering room, in the position from stokehold toward furnace rear direction flue gas pair
Washing away for gas-gas heat exchanger is larger, and heat exchange property is more preferably.
Aforementioned main formula case of the present invention and its each further selection scheme can be this with independent assortment to form multiple schemes
Invention can be adopted and claimed scheme：It is such as of the invention, it is each to select to select combination in any, people in the art with other
Member can understand there is multiple combination according to prior art and common knowledge after the present invention program is understood, and be claimed by the present invention
Technical scheme, here do not do exhaustion.
The course of work is：Important component part of the denitrification apparatus as thermal power plant, the present invention is using boiler and denitration as one
Individual entirety considers, makes full use of residual heat from boiler fume for SCR denitration urea pyrolysis and provide thermal source, can be that power plant's creation is good
Economic benefit.Flue gas-air heat exchanger is preferably arranged in boiler tail vertical shaft low temperature superheater or low-temperature reheater by the invention
Region, between 400 DEG C～900 DEG C, heat exchanger is connected and introduces once with the device for producing hot (cold) First air flue-gas temperature
Flue gas of the wind by above-mentioned boiler smoke region, the hot blast Jing after heat exchanger heating are re-introduced into urea pyrolysis reactor for which
Pyrolysis thermal source is provided.
Beneficial effects of the present invention：The present invention is by the specific position for limiting heat exchanger, arrangement form, arrangement knot
Structure, the combination in terms of three, both reducing the impact to boiler in turn ensure that good heat exchange property as far as possible.
The present invention is being close to after boiler by way of the fixation of bag wall air compartment is imported and exported so that the heat between air compartment and boiler
Stress difference is greatly reduced, it is to avoid destruction to steam generator system；It is one section that air compartment is imported and exported every a segment distance, is adopted between air compartment
Expansion joint connects, and further reduces differential expansion between boiler and air compartment, safe and reliable.
Present configuration and arrangement form, minimize and maximize heat exchange effect simultaneously for the impact of boiler internal running environment
Rate, while and gas-gas heat exchanger connecting tube tubing can be saved, reduce the cost of gas-gas heat exchanger equipment；And be not required to import and export
Header arranges complicated erecting by overhang.
Present configuration is simple, and manufacture and in-site installation are convenient, make full use of the flue gas heat of large-sized station boiler to heat
Thermal source of the air as urea pyrolysis, will create significant commercial value in power plant's operation.
Description of the drawings
Fig. 1 is the gas-gas heat exchanger arrangement schematic front view of the embodiment of the present invention；
Fig. 2 is the gas-gas heat exchanger arrangement schematic top plan view of the embodiment of the present invention；
Wherein heat exchanger pipeloop 1, import air compartment 2, import air compartment interface 3, outlet air compartment 4, outlet air compartment interface 5, air compartment
Fixing device 6, smoke sealing device 7, shoe 8, pipe clamp 9, pipeloop fixing device 10, boiler hanging pipe superheater pipe
11st, rear bag wall 12, mid-board 13, left side bag wall 14, right side bag wall 15.
Specific embodiment
Following non-limiting examples are used to illustrate the present invention.
With reference to shown in Fig. 1,2, a kind of hot heat-exchange system of inner flue gas of the stove of pyrolysis thermal source of supplying urea, including the gentle gas of boiler
Heat exchanger, gas-gas heat exchanger are arranged in boiler tail vertical shaft low temperature superheater or low-temperature reheater region.Gas-gas heat exchanger includes
Some row's heat exchanger pipeloops 1, the import air compartment 2 and its import air compartment interface 3 with 1 inlet communication of heat exchanger pipeloop, with heat exchanger
The outlet air compartment 4 and its outlet air compartment interface 5 of 1 outlet of pipeloop, import and export air compartment interface 3,5 is by expansion joint and ventilation
Pipeline connects, and heat exchanger pipeloop 1, and is consolidated by pipeloop to arranged in parallel into some rows between right side bag wall 15 in left side bag wall 14
Determine 10 lodge of device (to be hung using the original hanging pipe superheater pipe of boiler on boiler hanging pipe superheater pipe 11
It is fixed, lossless boiler structure), by Tube Sheet of Heat Exchanger, the bag wall 12 after boiler prolongs heat exchanger pipeloop 1 to level on 13 direction of mid-board
Stretching and pipeloop being bent to form to return on perpendicular, Tube Sheet of Heat Exchanger passes import and export between the band steel of bag wall 12 from after boiler
In air compartment 2,4, and Tube Sheet of Heat Exchanger is being bent to form fork configuration at import and export air compartment 2,4, the part of the fork configuration with
Horizontal plane angle a is 10 °～90 °, and heat exchanger pipeloop 1 is overall in nearly " Y " font (referring to Fig. 1).Heat exchanger pipeloop 1 in every
13 one end of wall is provided with abrasionproof cladding system 8, to reduce the erosive wear from stokehold toward furnace rear direction flue gas to gas-gas heat exchanger,
Pipe clamp 9 is additionally provided with heat exchanger pipeloop 1 and fixes its Tube Sheet of Heat Exchanger for bending back and forth, pipe clamp 9 is limited to heat exchanger pipeloop 1
Position is fixed.Import and export air compartment 2,4 be close to after 12 fixed and arranged of bag wall, and by some sections of air compartments boiler width side upwardly through
Expansion joint is connected and composed, and each section of air compartment is arranged symmetrically by boiler centrage.
Said system arrangement, workflow：
The pipeline of power plant fans outlet is connected with gas-gas heat exchanger import air compartment interface 3 by expansion joint, and outlet air compartment connects
Mouth 5 is connected with outlet hot-blast pipe line again by expansion joint.Boiler First air is incorporated into gas-gas heat exchanger by blower fan and enters one's intention as revealed in what one says
Room 2, air are entered back in several rows of heat exchanger pipeloop 1, after enter into heat exchanger exit wind after the high-temperature flue gas heating of vertical shaft
Room 4, the hot air duct that then Jing is connected with outlet air compartment interface 5 are incorporated in urea pyrolysis reactor as pyrolysis thermal source.
Heat exchanger inlet and outlet air compartment 2,4 does not adopt monoblock type on boiler width direction, it is contemplated that reduce bag wall after boiler
Differential expansion between 12 and air compartment, it is one section to import and export air compartment per certain distance, is connected using expansion joint, by boiler centrage between air compartment
It is arranged symmetrically.By calculating, air compartment fixing device 6 is set every a segment distance on air compartment 2,4 is imported and exported.The bag wall after boiler
Relevant position is preset with and the built-in fitting for coordinating is sealed with heat exchanger inlet and outlet air compartment 2,4, wears bag wall air compartment 2,4 pipeloops is imported and exported
Place is additionally provided with smoke sealing device 7, prevents flue gas from entering in air compartment.After in-site installation is good air compartment outer surface and warm-air pipe
Certain thickness insulation material is arranged on road.
Heat exchanger is arranged at boiler rear steering room, in the position from stokehold toward furnace rear direction flue gas to gas-gas heat exchanger
Wash away larger, so the high order end in heat exchanger pipeloop 1 is provided with abrasionproof cladding system 8.Determine that pipeloop is horizontal by Performance Calculation
Fix to bank of tubes quantity and the reasonability of longitudinal pipe row amount, and 9 heat exchanger pipeloop 1 of relative set pipe clamp.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of supplying urea is pyrolyzed the hot heat-exchange system of inner flue gas of the stove of thermal source, including boiler and gas-gas heat exchanger, and its feature exists
In：The gas-gas heat exchanger includes import air compartment and its import of some row's heat exchanger pipeloops and heat exchanger pipeloop inlet communication
The outlet air compartment and its outlet air compartment interface of air compartment interface and Tube Sheet of Heat Exchanger circle outlet, the import and export air compartment interface lead to
Cross expansion joint to be connected with ventilation shaft, the heat exchanger pipeloop is in left side bag wall to arranged in parallel into some between the bag wall of right side
Row, and hung on pipe superheater pipe in boiler by fixing device lodge, the heat exchanger pipeloop is by Tube Sheet of Heat Exchanger in boiler
Bag wall to horizontal-extending on mid-board direction and be bent to form pipeloop to return on perpendicular, wrap from after boiler by Tube Sheet of Heat Exchanger afterwards
Pass between the band steel of wall in the import and export air compartment, and Tube Sheet of Heat Exchanger is being bent to form fork at the import and export air compartment
Shape structure, the heat exchanger pipeloop integrally in nearly " Y " font, the import and export air compartment be close to after bag wall fixed and arranged, and if by
Dry section air compartment is connected and composed upwardly through expansion joint in boiler width side, and each section of air compartment is arranged symmetrically by boiler centrage.
2. supply urea as claimed in claim 1 and be pyrolyzed the hot heat-exchange system of inner flue gas of the stove of thermal source, it is characterised in that：It is described to change
Hot device pipeloop is provided with shoe near mid-board one end.
3. supply urea as claimed in claim 1 and be pyrolyzed the hot heat-exchange system of inner flue gas of the stove of thermal source, it is characterised in that：It is described to change
It is 10 ° that the Tube Sheet of Heat Exchanger of hot device pipeloop is bent to form the part of fork configuration and horizontal plane angle at the import and export air compartment
～90 °.
4. supply urea as claimed in claim 1 and be pyrolyzed the hot heat-exchange system of inner flue gas of the stove of thermal source, it is characterised in that：It is described to change
Pipe clamp is additionally provided with hot device pipeloop and fixes its Tube Sheet of Heat Exchanger for bending back and forth.
5. supply urea as claimed in claim 1 and be pyrolyzed the hot heat-exchange system of inner flue gas of the stove of thermal source, it is characterised in that：The gas
Gas heat exchanger is arranged in boiler tail vertical shaft low temperature superheater or low-temperature reheater region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510315955.0A CN104896495B (en) | 2015-06-10 | 2015-06-10 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510315955.0A CN104896495B (en) | 2015-06-10 | 2015-06-10 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
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| Publication Number | Publication Date |
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| CN104896495A CN104896495A (en) | 2015-09-09 |
| CN104896495B true CN104896495B (en) | 2017-04-12 |
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| CN201510315955.0A Active CN104896495B (en) | 2015-06-10 | 2015-06-10 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105423323B (en) * | 2015-12-23 | 2018-06-05 | 哈尔滨锅炉厂有限责任公司 | For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4350100A (en) * | 1979-11-13 | 1982-09-21 | James Howden Australia Pty. Limited | Air infiltration and mixing device |
| US7615200B2 (en) * | 2000-12-01 | 2009-11-10 | Fuel Tech, Inc. | Selective catalytic reduction of NOx enabled by urea decomposition in heat-exchanger bypass |
| CN101050854B (en) * | 2007-05-18 | 2010-05-26 | 哈尔滨工业大学 | W-shape flame boiler for preventing side wall water cooling wall slagging scorification |
| CN202074503U (en) * | 2011-04-23 | 2011-12-14 | 淄博齐林贵和热电有限公司 | Energy-saving coal economizer for boiler |
| CN103191640B (en) * | 2013-04-11 | 2015-11-18 | 东方电气集团东方锅炉股份有限公司 | A kind of SCR denitration reducing agent urea pyrolysis thermal source supply method and device |
| CN203464242U (en) * | 2013-08-29 | 2014-03-05 | 山东华鲁恒升化工股份有限公司 | High-medium-low temperature overall economizer for coal-fired boiler |
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