CN205842625U - A kind of low-level (stack-gas) economizer - Google Patents
A kind of low-level (stack-gas) economizer Download PDFInfo
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- CN205842625U CN205842625U CN201620772369.9U CN201620772369U CN205842625U CN 205842625 U CN205842625 U CN 205842625U CN 201620772369 U CN201620772369 U CN 201620772369U CN 205842625 U CN205842625 U CN 205842625U
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Abstract
The utility model discloses a kind of low-level (stack-gas) economizer, including water inlet pipe, outlet pipe, bypass duct, recirculation conduit, EGR, and gas cooler；Described bypass duct is connected with water inlet pipe and outlet pipe the most respectively with recirculation conduit, gas cooler includes water inlet end, water side, the water inlet end of gas cooler is connected with water inlet pipe, the water side of gas cooler and outlet pipe connect, described bypass duct, recirculation conduit compared with the communicating position of water inlet pipe the communicating position of described gas cooler and water inlet pipe closer to the water inlet end of water inlet pipe.This utility model is by increasing the equipment such as bypass duct and recirculation conduit, solve that economizer exhaust gas temperature when boiler at low load is too low and the cold end corrosion problem that causes, scrap build is simple and investment is little, actual effect is clearly, operations staff is easy to operate, substantially increase the motility that system is run, increase the load adaptability of equipment, in a disguised form improve the thermal efficiency of unit.
Description
Technical field
This utility model relates to a kind of low-level (stack-gas) economizer, belongs to heat recovery technology field.
Background technology
The main energy sources of power generation is the heat energy that fuel combustion discharges.The fuel that power station uses is mainly coal
Charcoal, oil and natural gas, and these fuel all contain a certain amount of sulfur.Sulfur generates sulfur oxide gas (SO through burning2With
SO3).Sulfur oxide gas in flue gas and the existence of dust, make the dew point temperature of boiler smoke reach 90-110 DEG C.Additionally, cigarette
Condensation vapor in gas becomes water droplet, and generates sulphuric acid, the most seriously corrosion steel damage equipment with sulfur oxide gas reaction,
And the water droplet of condensation makes heating surface pipe appearance moist in flue gas, exacerbate dust heating surface deposition, adhere to and block.
So the temperature of the smoke evacuation in power station is set between 140-150 DEG C.Why the temperature set is far above flue gas dew point temperature master
It is contemplated to avoid acid corrosion and stifled ash.But but make the thermal loss of correspondence be greatly increased, be equivalent to fuel heat
8%～12%.For a large amount of heat energy in recovery boiler flue gas, saving fuel, the most a lot of boilers all employ economizer, i.e.
In economizer, carry out heat exchange with cold water and flue gas, reduce the exhaust temperature of flue gas, will relay through the water of heating simultaneously
Back boiler, to reduce the coal consumption of boiler, reaches the purpose of energy-saving and emission-reduction.
For the low-level (stack-gas) economizer involved by this patent, when boiler of power plant is in underload, flue gas enters and saves
The temperature of coal device can reduce, if the most effectively adjusting the duty of economizer, will result in low-temperature dew point corrosion
Situation；Similarly situation also appears in boiler when operating in the winter time, the low temperature dew that extraneous ambient temperature is caused time too low
Spot corrosion.
Utility model 201220718322.6 discloses a kind of therrmodynamic system improving economizer exit cigarette temperature, including province's coal
The economizer feed water by-pass that device outlet header, drum, economizer, economizer feed pipe and vertical are arranged, described economizer exit
Being provided with several connecting tube between header and drum, the bottom of economizer feed water by-pass is connected on economizer feed pipe, and top connects one
The cross over pipe of horizontally set, described cross over pipe picks out and the arm of one_to_one corresponding connection identical with connecting tube quantity.This patent
Economizer be the high-temperature economizer on ordinary meaning, purpose that the dynamical system of this economizer is to be realized and the effect reached
The most different with this patent, in the case of arriving certain low temperature in ambient temperature, this system just cannot solve
Certainly problem, therefore the technology as high-temperature economizer can not be fully solved the low-temperature dew point corrosion that low-level (stack-gas) economizer is faced
Problem.
Utility model 201420155537.0 discloses a kind of efficiently without dew point corrosion economizer, including economizer, heat exchange
Device, the first to the 3rd pipeline.The high temperature heat source import of heat exchanger connects the 3rd pipeline, and the thermal source outlet of this heat exchanger connects a heat
Source outlet conduit, the low-temperature receiver entrance of this heat exchanger connects a low temperature boiler feed pipe；The entrance of economizer by the first pipeline with
The low-temperature receiver outlet of heat exchanger connects, and the outlet of economizer connects high temperature section economizer by second pipe；High temperature heat source medium leads to
Cross after the 3rd pipeline enters heat exchanger heat exchange cooling and pass through thermal source outlet pipeline outflow heat exchanger；Boiler feedwater is through heat exchanger
Heat exchange is heated and is increased to more than the acid dew-point temperature of economizer, then exports outflow heat exchanger from the low-temperature receiver of heat exchanger, then passes through
First pipeline enters economizer, flows out economizer by the outlet of economizer after then absorbing the heat of economizer, finally by
Second pipe enters boiler-steam dome or high-temperature economizer.This patent adds heat exchanger for the temperature improving flue gas, the most also
Increase optional equipment and maintenance associated conduit, add the cost of equipment complexity and equipment.
In view of this special proposition this utility model.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, it is provided that a kind of low-level (stack-gas) economizer,
By increasing the equipment such as bypass duct and recirculation conduit, solve low-level (stack-gas) economizer exhaust gas temperature when boiler at low load too low
And the cold end corrosion problem caused, scrap build is simple and investment seldom, actual effect clearly, the operations staff side of operation
Just, substantially increase the motility that system is run, increase the load adaptability of equipment, in a disguised form improve the thermal effect of unit
Rate.
For solving above-mentioned technical problem, the basic conception of this utility model employing technical scheme is:
A kind of low-level (stack-gas) economizer, including water inlet pipe, outlet pipe, bypass duct, recirculation conduit, EGR, and cigarette
Gas Cooler；Described bypass duct is connected with water inlet pipe and outlet pipe the most respectively with recirculation conduit, and gas cooler includes
Water inlet end, water side, the water inlet end of gas cooler is connected with water inlet pipe, and the water side of gas cooler and outlet pipe connect,
Described bypass duct, recirculation conduit be described gas cooler and the communicating position of water inlet pipe compared with the communicating position of water inlet pipe
Water inlet end closer to water inlet pipe.
Further, described low-level (stack-gas) economizer is sequentially connected with higher level's low-temperature heater and subordinate's low-temperature heater respectively,
One end of the described water inlet pipe of this grade low-temp economizer is connected with the outlet conduit of higher level's low-temperature heater, the other end and this grade of institute
State gas cooler to connect.
Further, described outlet pipe one end of this grade low-temp economizer is connected with this grade of described gas cooler, another
End is connected with the water inlet pipe of subordinate's low-temperature heater.
Further, described bypass duct include two parallel, and pipe ends comes round with water inlet pipe and outlet pipe respectively
Main bypass duct and backup bypass pipeline.
Further, the pipe radius of described bypass duct is not less than the pipe radius of water inlet pipe.
Further, described main bypass duct is provided with electrodynamic valve, respectively installs in water inlet end and the water side of electrodynamic valve
There is a stop valve.
Further, described backup bypass pipeline is provided with normally closed cut-off valve.
Further, described recirculation conduit quantity at least two.
Further, described every recirculation conduit is fitted with described EGR.
Further, described EGR includes a variable frequency pump, divides in water inlet end and the water side of variable frequency pump
One stop valve is not installed.
After using technique scheme, this utility model compared with prior art has the advantages that.By increasing
Bypass duct so that by the low-level (stack-gas) economizer outlet cigarette caused by the reasons such as boiler at low load or ambient temperature be relatively low
The too low phenomenon of temperature is addressed, thus avoids the outlet cigarette temperature occurred after using low-level (stack-gas) economizer due to boiler and be less than flue gas
Dewpoint and the cold end corrosion situation that causes.
This utility model subtracts the equipment of coal device exhaust gas temperature and compares and have the advantage that low-level (stack-gas) economizer with existing raising
Bypass duct simple in construction, scrap build small investment；The setting of main bypass duct and backup bypass pipeline not only carries for equipment
More preferable redundancy has been supplied to be equipped with so that the bypass duct standby when main bypass duct breaks down still can play equipment institute
The effect needed, when standby usage bypass duct is opened simultaneously simultaneously, it is also possible to reduce quantity of circulating water in low-level (stack-gas) economizer further, from
And improve the flexibility ratio that equipment uses, and this Redundancy Design can also realize on-line maintenance, and then add equipment
Reliability and the facility of maintenance；On the other hand this utility model additionally provides recirculating system and and its supporting recirculation dress
Put so that under the situation that extreme low temperature or load are extremely low, with the side of the inflow temperature improving low-level (stack-gas) economizer further
Method makes economizer remain in operation, thus increases the load adaptability of equipment, in a disguised form improves the thermal power of unit；Further
Ground, this recirculation conduit and EGR thereof also use redundant configuration, maintains easily can realize on-line maintenance equally
While, further increase the motility of load adaptivity.
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described in further detail.
Accompanying drawing explanation
Accompanying drawing, as a part of the present utility model, is used for providing being further understood from of the present utility model, this practicality
Novel schematic description and description is used for explaining this utility model, but does not constitute improper restriction of the present utility model.
Obviously, the accompanying drawing in describing below is only some embodiments, to those skilled in the art, is not paying creation
Property work on the premise of, it is also possible to obtain other accompanying drawings according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the present embodiment structural representation；
In figure: 1, water inlet pipe；2, main bypass duct；3, main bypass water inlet end stop valve；4, gas cooler；5, recirculation
Pipeline water side stop valve a；6, check-valves a；7, recirculation conduit a；8, variable frequency pump a；9, recirculation conduit water inlet end cut-off
Valve a；10, recirculation conduit water inlet end stop valve b；11, variable frequency pump b；12, recirculation conduit b；13, check-valves b；14, follow again
Water side, endless tube road stop valve b；15, main bypass duct water side stop valve；16, electrodynamic valve；17, outlet pipe；18, backup bypass
Pipeline；19, backup bypass pipeline normally closed cut-off valve.
It should be noted that these accompanying drawings and word describe and are not intended as limiting by any way the design model of the present invention
Enclose, but be that those skilled in the art illustrate idea of the invention by reference specific embodiment.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in embodiment is clearly and completely described, following example are used for illustrating the present invention, but
It is not limited to the scope of the present invention.
In describing the invention, it should be noted that term " on ", D score, "front", "rear", "left", "right", " perpendicular
Directly ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, merely to just
In describe the present invention and simplifying describe rather than instruction or the hint device of indication or element must have specific orientation, with
Specific azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary.For this
For the those of ordinary skill in field, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.
As it is shown in figure 1, this utility model discloses a kind of low-level (stack-gas) economizer, including water inlet pipe 1, outlet pipe 17, shunt valve
Road, recirculation conduit, EGR, and gas cooler 4；Described bypass duct and recirculation conduit the most respectively with water inlet pipe
1 is connected with outlet pipe 17, and gas cooler 4 includes water inlet end, water side, and the water inlet end of gas cooler 4 is with water inlet pipe 1 even
Connecing, water side and the outlet pipe 17 of gas cooler 4 connect, described bypass duct, recirculation conduit and the connection position of water inlet pipe 1
Put the communicating position comparing described gas cooler 4 and water inlet pipe 1 closer to the water inlet end of water inlet pipe 1.
Embodiment 1:
Low-level (stack-gas) economizer disclosed in this utility model is respectively with higher level's low-temperature heater and subordinate's low-temperature heater successively
Connect.As it is shown in figure 1, one end of water inlet pipe 1 of the low-level (stack-gas) economizer in this grade connects with the outlet conduit of higher level's low-temperature heater
Connecing, the other end is connected with this grade of described gas cooler 4；Outlet pipe 17 one end of this grade low-temp economizer and the cigarette of this grade simultaneously
Gas Cooler 4 connects, and the other end is connected with the water inlet pipe of subordinate's low-temperature heater；Flue gas is made to flow in multistage low-level (stack-gas) economizer
Dynamic, thus the cycle fluid (usually water) in economizer is obtained stepped heating, fully absorb fume afterheat, reach to save combustion
The purpose of material.
But the waste heat being accompanied by flue gas is gradually absorbed, the outlet temperature of flue gas is also made constantly to reduce.In general, low
Temperature economizer design typically all have to meet boiler outlet temperature under conventional load and be higher than the close dew temperature of flue gas (extremely
Few 100 DEG C) because when exporting cigarette temperature less than close dew temperature, flue gas can be at low-level (stack-gas) economizer surface sweating, and due in flue gas
Containing SO3Deng material, after flue gas condensed forms water, therefore flue can be caused serious cold end corrosion.
But when boiler is in the operating condition of ultra-low load, owing to the outlet cigarette temperature of boiler is less than the routine of economizer
Design requirement, now the outlet cigarette temperature of economizer is just easy to below less than condensation point；Identical situation also can be in extremely cold area
Same occur, now extraneous ambient temperature is the lowest, if still using the water loop control servosystem of former economizer, and will
Cause above-mentioned cold end corrosion problem.In order to solve such problem, some units can only be to cut off low-level (stack-gas) economizer, at fuel
Cannot save in the facing a difficult choice of the device damage that causes with cold end corrosion and choose.This utility model provides a kind of simple side
Just, remarkably productive and that reliability is the highest structure design solves this problem.
As it is shown in figure 1, the low-level (stack-gas) economizer in the present embodiment is before water inlet pipe 1 enters gas cooler 4, add two
The main bypass duct 2 come round with water inlet pipe 1 and outlet pipe 17 respectively in the parallel two ends of bar and backup bypass pipeline 18；In main bypass
On pipeline 2, the direction along bypass duct water inlet is sequentially installed with main bypass water inlet end stop valve 3, electrodynamic valve 16, main shunt valve
Water side, road stop valve 15；Backup bypass pipeline 18 is provided with backup bypass pipeline normally closed cut-off valve 19.
Bypass duct encloses this pipeline by corresponding stopper under normal circumstances, but when boiler is in low negative
Lotus, or ambient temperature is too low etc. when reason needs the outlet cigarette temperature improving low-level (stack-gas) economizer, just by opening master
A part of recirculated water that bypass duct 2 electrodynamic valve 16 above realizes entering in gas cooler 4 by water inlet pipe 1 without
Heat exchange flows directly into outlet pipe 17 so that the medium of vapour-liquid heat exchange reduces, and reduces the efficiency of heat exchange thus improves out
Mouth cigarette temperature.Simultaneously in order to improve the effect of this shunting effect, the pipe radius of bypass duct is designed as not less than water inlet pipe 1
Pipe radius.
In order to provide maintenance convenient, water inlet end and the water side of the design electrodynamic valve 16 on main bypass duct 2 are divided
It is not provided with main bypass water inlet end stop valve 3 and main bypass duct water side stop valve 15, when electrodynamic valve 16 breaks down needs
The when of maintenance, by closing main bypass water inlet end stop valve 3 and main bypass duct water side stop valve 15, it is achieved to electrodynamic valve
16 carry out the purpose overhauled in the environment of anhydrous.
In order to meet above-mentioned repair occur time, it is achieved the effect of by-pass shunt, this utility model is provided with standby side
Road pipeline 18, is provided with backup bypass pipeline normally closed cut-off valve 19 on backup bypass pipeline 18.Backup bypass under normal circumstances
Pipeline 18, by the control of backup bypass pipeline normally closed cut-off valve 19 thereon, closes this bypass duct.But when occurring such as
When the main bypass duct 2 that above-mentioned maintenance or other situations cause cannot normally play a role, can be by opening this standby side
Road pipeline normally closed cut-off valve 19, makes the cycle fluid of participation heat exchange pass through this backup bypass pipeline 18 again without through overheated friendship
Change, and flow directly into outlet pipe 17, reach to improve the effect of outlet cigarette temperature.
Embodiment 2:
In the boiler running process of reality, it is also possible to even if occurring by the method for above-mentioned by-pass shunt recirculated water also
Cannot meet the situation that outlet cigarette temperature requires, former method is through closing the method for higher level's economizer and realizes raising cigarette
The purpose of temperature, this method is put off easily by a slight risk equally, causes fuel more to consume.This utility model is by increasing recirculation conduit
Mode solve this problem.
In the present embodiment, recirculation conduit is arranged as it is shown in figure 1, include two recirculation conduits, respectively recirculatioies
Pipeline a7 and recirculation conduit b12, every recirculation conduit is fitted with EGR, as a example by recirculation conduit a7,
EGR on recirculation conduit a7 includes recirculation conduit water inlet end stop valve a9, frequency conversion successively along the direction of current
Water pump a8, check-valves a6, recirculation conduit water side stop valve a5.
When occurring under extreme low temperature or the extremely low situation of load, in order to improve the outlet cigarette temperature of economizer further,
Now can continue the variable frequency pump opening on recirculation conduit, by water outlet after the bypass duct in fully opening embodiment 1
The hot water of pipe 17 side is pumped into the water inlet side of gas cooler 4, so can ensure that the temperature of flue gas is higher than more than dew point temperature
Requirement.
The when that variable frequency pump a8 on recirculation conduit a7 needing maintenance, can intake by closing recirculation conduit
End stop valve a9, check-valves a6, recirculation conduit water side stop valve a5, make variable frequency pump a8 be in anhydrous environment, convenient
Carry out maintenance and the maintenance of equipment.When recirculation conduit a7 can not work due to a variety of causes, it is also possible to follow again by opening
Endless tube road b12 reaches identical effect, and by adjusting recirculation conduit a7 and the water yield of recirculation conduit b12, permissible
Control the temperature of smoke evacuation easily.This redundant configuration, is realizing while on-line maintenance maintains easily, is further increasing
The motility of load adaptivity.
The above is only preferred embodiment of the present utility model, not makees this utility model any pro forma
Limit, although this utility model is disclosed above with preferred embodiment, but is not limited to this utility model, any familiar
The technical staff of this patent is in the range of without departing from technical solutions of the utility model, when the technology contents of available above-mentioned prompting is made
Go out a little change or be modified to the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solutions of the utility model,
Any simple modification, equivalent variations and the modification made above example according to technical spirit of the present utility model, the most still belongs to
In the range of this utility model scheme.
Claims (10)
1. a low-level (stack-gas) economizer, it is characterised in that: include water inlet pipe, outlet pipe, bypass duct, recirculation conduit, recirculation
Device, and gas cooler；Described bypass duct is connected with water inlet pipe and outlet pipe the most respectively with recirculation conduit, and flue gas is cold
But device includes water inlet end, water side, and the water inlet end of gas cooler is connected with water inlet pipe, the water side of gas cooler and water outlet
Pipe connects, and described bypass duct, recirculation conduit be described gas cooler and water inlet pipe compared with the communicating position of water inlet pipe
Communicating position is closer to the water inlet end of water inlet pipe.
Low-level (stack-gas) economizer the most according to claim 1, it is characterised in that: described low-level (stack-gas) economizer adds with upper grade low-temp respectively
Hot device and subordinate's low-temperature heater are sequentially connected with, one end of the described water inlet pipe of this grade low-temp economizer and higher level's low-temperature heater
Outlet conduit connect, the other end is connected with this grade of described gas cooler.
Low-level (stack-gas) economizer the most according to claim 2, it is characterised in that: described outlet pipe one end of this grade low-temp economizer
Being connected with this grade of described gas cooler, the other end is connected with the water inlet pipe of subordinate's low-temperature heater.
Low-level (stack-gas) economizer the most according to claim 1, it is characterised in that: described bypass duct include two parallel, and pipe
The main bypass duct come round with water inlet pipe and outlet pipe respectively in two ends, road and backup bypass pipeline.
Low-level (stack-gas) economizer the most according to claim 1, it is characterised in that: the pipe radius of described bypass duct be not less than into
The pipe radius of water pipe.
Low-level (stack-gas) economizer the most according to claim 4, it is characterised in that: on described main bypass duct, electrodynamic valve is installed,
In water inlet end and the water side of electrodynamic valve, one stop valve is respectively installed.
Low-level (stack-gas) economizer the most according to claim 4, it is characterised in that: it is provided with normally closed section on described backup bypass pipeline
Only valve.
Low-level (stack-gas) economizer the most according to claim 1, it is characterised in that: described recirculation conduit quantity at least two.
Low-level (stack-gas) economizer the most according to claim 8, it is characterised in that: it is fitted with institute on described every recirculation conduit
State EGR.
Low-level (stack-gas) economizer the most according to claim 9, it is characterised in that: described EGR includes a frequency conversion water
Pump, is separately installed with a stop valve in water inlet end and the water side of variable frequency pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620772369.9U CN205842625U (en) | 2016-07-20 | 2016-07-20 | A kind of low-level (stack-gas) economizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620772369.9U CN205842625U (en) | 2016-07-20 | 2016-07-20 | A kind of low-level (stack-gas) economizer |
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| Publication Number | Publication Date |
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| CN205842625U true CN205842625U (en) | 2016-12-28 |
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ID=57624672
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107514621A (en) * | 2017-09-29 | 2017-12-26 | 云南文山铝业有限公司 | Molten salt furnace flue gas waste heat recovery system |
| CN108731269A (en) * | 2018-08-06 | 2018-11-02 | 珠海格力电器股份有限公司 | A kind of condensation-proof burnt gas wall hanging furnace and its condensation-proof method |
-
2016
- 2016-07-20 CN CN201620772369.9U patent/CN205842625U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107514621A (en) * | 2017-09-29 | 2017-12-26 | 云南文山铝业有限公司 | Molten salt furnace flue gas waste heat recovery system |
| CN108731269A (en) * | 2018-08-06 | 2018-11-02 | 珠海格力电器股份有限公司 | A kind of condensation-proof burnt gas wall hanging furnace and its condensation-proof method |
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