CN207778478U - A kind of classification economizer feed water by-pass temperature-raising device - Google Patents
A kind of classification economizer feed water by-pass temperature-raising device Download PDFInfo
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- CN207778478U CN207778478U CN201721921299.XU CN201721921299U CN207778478U CN 207778478 U CN207778478 U CN 207778478U CN 201721921299 U CN201721921299 U CN 201721921299U CN 207778478 U CN207778478 U CN 207778478U
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Abstract
The utility model provides a kind of classification economizer feed water by-pass temperature-raising device, including boiler back end ductwork, first economizer, compensate economizer, SCR inlet flue, SCR denitration reactor, second economizer, feed water by-pass and exhaust pass, first economizer and compensation economizer are arranged in boiler back end ductwork, compensate the compensation storehouse that adjustable opening angle is equipped on the outside of economizer, SCR inlet flue connects boiler back end ductwork, SCR denitration reactor is set after SCR inlet flue, second economizer is set after SCR denitration reactor, second economizer connection outlet flue, feed water by-pass includes the first bypass and the second bypass, first bypass the first economizer of connection and the second economizer, second bypass connection compensation economizer and the second economizer.The utility model can compensate the opening angle in storehouse by change, compensate SCR inlet smoke temperature variable quantity, maintain stable denitration temperature.
Description
Technical field
The utility model belongs to gas denitrifying technology field, and in particular to a kind of classification economizer feed water by-pass temperature raising dress
It sets.
Background technology
The nitrogen oxide NOx generated by fire coal is one of the important sources of current environmental pollution.Industrial production controls at present
The discharge of NOx mostly uses selective catalytic reduction (SCR) denitrification apparatus.By the requirement of SCR denitration reaction temperature, SCR is de-
Nitre device is typically mounted at boiler economizer and is exported between the flue of air preheater entrance.SCR denitration reaction process：SCR
Denitrating system be ammonia or other suitable reducing agents are sprayed into the flue gas of catalyst upstream, will be in flue gas using catalyst
NOx conversion is nitrogen and water.In the typical design, it is mixed using liquid anhydrous ammonia or ammonium hydroxide and diluent air, utilizes spray ammonia
Grid is sprayed into the flue gas of SCR reactors upstream.
Currently, domestic denitrification apparatus entry design flue-gas temperature is generally under boiler evaporation capacity (BMCR) operating mode
350~380 DEG C.However, boiler is when middle-low load is run, economizer exit flue-gas temperature, that is, SCR device entrance flue gas temperature
Catalyst activity reaction temperature may be less than so that denitrating catalyst activity is unable to maintain that in optimum state, SCR denitration device
Operational efficiency reduces, and the escaping of ammonia rate increases.In addition, from SCR reactors escape NH3 and flue gas in SO3 and H2O in a constant temperature
The lower reaction of degree generates NH4HSO4With a small amount of (NH4)2SO4, and NH4HSO4With stronger cohesiveness, air preheater can be attached to
Fly ash granule is simultaneously adsorbed in surface, and accumulation for a long time can cause stifled ash, then increase wind turbine power consumption, or even jeopardizes boiler operatiopn peace
Complete and output.In actual production process, when boiler load is too low, catalyst activity temperature is not achieved in SCR device entrance flue gas temperature
Degree requires, and denitrification apparatus can not put into operation, and flue gas emission can be caused not up to standard.
Therefore, it is necessary to take measures to promote boiler SCR denitration device entrance flue gas temperature under middle-low load operating condition.
Currently, a variety of feasible regulating measures that worker proposes in the industry, such as increase economizer water circulating pump and improve feed temperature, adjust
Gas baffle increases air quantity, economizer gas bypass.Most schemes are all to ensure reaction temperature to sacrifice boiler efficiency as cost
Degree.In addition, may be in due to boiler operatiopn load under the operating mode of larger fluctuation, cause the smoke temperature of denitration reaction that can also follow
Big ups and downs, when reaction temperature is higher, catalyst will produce sintering or crystalline polamer；When reaction temperature is relatively low, catalysis
The activity of agent can be reduced because sulfate of ammoniac condenses the micropore of blocking catalyst in catalyst surface；And the smoke temperature of big ups and downs
Also the performances such as the best ammonia spraying amount needed for denitration reaction are affected.Therefore, SCR inlet smoke temperature big ups and downs is avoided to become SCR cigarettes
One of the critical issue of the safe efficient operation of gas denitrating system.
Utility model content
The purpose of this utility model is to provide a kind of classification economizer feed water by-pass temperature-raising device, dynamically maintains SCR
Inlet flue gas temperature is steady, improves the safety and reliability of SCR operations.
The utility model provides the following technical solution：
A kind of classification economizer feed water by-pass temperature-raising device, including boiler back end ductwork, the first economizer, compensation province coal
Device, SCR inlet flue, SCR denitration reactor, the second economizer, feed water by-pass and exhaust pass, the first economizer and compensation save
Coal device is arranged in boiler back end ductwork, and the compensation storehouse of adjustable opening angle, SCR inlet flue are equipped on the outside of compensation economizer
Boiler back end ductwork is connected, ammonia-spraying grid is equipped in SCR inlet flue, SCR denitration reactor, SCR are set after SCR inlet flue
Second economizer, the second economizer connection outlet flue are set after Benitration reactor, and feed water by-pass includes the first bypass and second
Bypass, first bypass the first economizer of connection and the second economizer, the second bypass connection compensation economizer and the second economizer.
Preferably, compensation storehouse include wall and be separately positioned on wall up and down both sides upper smoke barrier and lower smoke barrier,
Upper smoke barrier, lower smoke barrier, wall and boiler back end ductwork side wall enclose compensation storehouse, upper smoke barrier and lower smoke barrier can divide
It is not rotated around wall.
Preferably, further include controller and SCR inlet flue gas temperature measurement device, SCR inlet flue gas temperature measurement device is set to SCR
In gas approach, SCR inlet flue gas temperature measurement device connects controller, and SCR inlet flue gas temperature measurement device transmits temperature to controller
Value, controller are separately connected smoke barrier and lower smoke barrier, and controller can be according to the temperature value control of SCR inlet flue gas temperature measurement device
The rotational angle of smoke barrier and lower smoke barrier in system.
Preferably, SCR inlet flue gas temperature measurement device is set to the initiating terminal of SCR inlet flue.
Preferably, compensation economizer and the first economizer or so is disposed in parallel in boiler back end ductwork.
Preferably, the first bypass is equipped with the first regulating valve, and the second bypass is equipped with the second regulating valve, and controller connects respectively
Connect the first regulating valve and the second regulating valve.
The utility model has the beneficial effects that：Economizer is respectively set before and after SCR denitration reactor, SCR can be reduced
The heat exchange amount of inlet flue gas improves SCR denitration reactor to improve the SCR inlet smoke temperature under middle-low load operating condition
Out of stock efficiency；The setting compensation economizer in boiler back end ductwork, when boiler operatiopn load is unstable, in boiler back end ductwork
Smoke temperature fluctuation range it is larger, by the first economizer heat exchange after, SCR inlet smoke temperature can also fluctuate, at this point, adjustable compensation storehouse
Opening angle, make compensation economizer work, through overcompensation economizer and the first economizer heat exchange after mixed flue gas make flue gas
Temperature controls in a metastable range, to maintain SCR inlet smoke temperature to be under the operating mode of dynamic stability, Bu Huiyin
Cause the degree of out of stock reaction uncontrollable for SCR inlet smoke temperature acute variation.
Description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality
Novel embodiment for explaining the utility model, does not constitute limitations of the present invention together.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of the utility model；
In figure label for：1. boiler back end ductwork；21. the first economizer；22. compensating economizer；23. the second economizer；
3.SCR gas approach；4. compensating storehouse；41. wall；Smoke barrier on 42.；43. lower smoke barrier；5. ammonia-spraying grid；6.SCR denitrations are anti-
Answer device；71. the first bypass；711. first regulating valves；72. the second bypass；721. second regulating valves；8.SCR inlet flue gas temperatures measure
Device.
Specific implementation mode
As shown in Figure 1, a kind of classification economizer feed water by-pass temperature-raising device, including boiler back end ductwork 1, the first economizer
21, economizer 22, SCR inlet flue 3, SCR denitration reactor 6, the second economizer 23, feed water by-pass and exhaust pass are compensated,
First economizer 21 and compensation economizer 22 are arranged in boiler back end ductwork 1,22 outside of compensation economizer be equipped with it is salable or
The compensation storehouse 4 that person opens, SCR inlet flue 3 connect boiler back end ductwork 1, ammonia-spraying grid 5, SCR are equipped in SCR inlet flue 3
SCR denitration reactor 6 is set after gas approach 3, the second economizer 23 is set after SCR denitration reactor 6, the second economizer 23 connects
Exit flue, feed water by-pass include the first bypass 71 and the second bypass 72,71 the first economizers 21 of connection of the first bypass and the
Two economizers 23,72 connection compensation economizer 22 of the second bypass and the second economizer 23.
Preferably, compensation storehouse 4 includes wall 41 and is separately positioned on the upper smoke barrier 42 of about 41 both sides of wall under
Smoke barrier 43, upper smoke barrier 42, lower smoke barrier 43, wall 41 and boiler back end ductwork 1 side wall enclose compensation storehouse 4, upper gear
Cigarette plate 42 and lower smoke barrier 43 can be rotated rotating around wall 41.By the upper smoke barrier 42 of change and lower smoke barrier 43 around 41 turns of wall
Dynamic angle, control enters the exhaust gas volumn in compensation storehouse 4, and then controls the flue-gas temperature of SCR inlet compensation, makes SCR inlet cigarette
It is warm controllable.For example, when boiler operatiopn load improves, 1 temperature of boiler back end ductwork increases, it is possible to increase upper smoke barrier 42 and lower block
Opening angle of the cigarette plate 43 relative to wall 41 suitably increases the flue gas heat exchange amount of compensation economizer 22, to slightly reduce
SCR inlet smoke temperature makes SCR inlet smoke temperature be maintained in metastable range, maintains the dynamic equilibrium of SCR inlet smoke temperature, from
And make the performances more equalization stables such as ammonia spraying amount needed for denitration reaction, the service life of catalyst, outlet smoke temperature.
Preferably, further include controller and SCR inlet flue gas temperature measurement device 8, SCR inlet flue gas temperature measurement device 8 is set to
In SCR inlet flue 3, SCR inlet flue gas temperature measurement device 8 connects controller, and SCR inlet flue gas temperature measurement device 8 is passed to controller
Temperature value, controller is sent to be separately connected smoke barrier 42 and lower smoke barrier 43, controller can be according to SCR inlet flue gas temperature measurement device
The rotational angle of 8 temperature value control upper smoke barrier 42 and lower smoke barrier 43.As the SCR that SCR inlet flue gas temperature measurement device 8 detects
When the fluctuating range of inlet flue gas temperature exceeds setting value, the rotational angle of controller rotation upper smoke barrier 42 and lower smoke barrier 43 changes
Become the boiler fuel flow entered in compensation storehouse 4, makes by the mixed flue gas after compensation economizer 22 and the heat exchange of the first economizer 21
Temperature controls in the stable range that SCR reacts, and controller and SCR inlet flue gas temperature measurement device 8 improve this implementation
The degree of automation and control accuracy of example.
Preferably, SCR inlet flue gas temperature measurement device 8 is set to the initiating terminal of SCR inlet flue 3, that is, is set to SCR inlet
The connecting pin of flue 3 and boiler back end ductwork 1 is conducive to the variation of fast reaction SCR inlet smoke temperature, controller is made to adjust in time
The aperture of upper smoke barrier 42 and lower smoke barrier 43, to which more delicately control enters the smoke temperature of SCR reactors, temperature change is bent
Line is relatively steady.
Preferably, it compensates economizer 22 and the first economizer 21 or so is disposed in parallel in boiler back end ductwork 1, make difference
It is non-interference into compensation economizer 22 and the flue gas of the first economizer 21, it avoids reducing heat exchange effect since smoke secondary exchanges heat
Rate, and reduce the controllability of SCR inlet smoke temperature.
Preferably, the first bypass 71 is equipped with the first regulating valve 711, and the second bypass 72 is equipped with the second regulating valve 721, control
Device processed is separately connected the first regulating valve 711 and the second regulating valve 721, and when boiler at low load is run, controller is adjusted by the of first
Water proportion is given in the bypass of road 71 and second 72, and the first economizer of part 21 and the entrance water supply of compensation economizer 22 is made to pass through water supply
Bypass directly reaches the entrance header of the second economizer 23 after classification, reduces in the first economizer 21 and compensation economizer 22
Heat exchange amount, to promote SCR inlet smoke temperature.
Operation principle is：It will be original specifically in actual condition by the way that the first economizer 21 and the second economizer 23 is arranged
Economizer be cut into the first economizer 21 and the second economizer 23, add second in the exhaust pass of SCR denitration reactor 6
Economizer 23 reduces the heat-transfer surface of the economizer at SCR inlet flue 3 when boiler at low load is run, to improve
Water supply is connected at the second economizer 23 and exchanges heat by SCR inlet smoke temperature, the first bypass 71, will not reduce boiler heat on the whole
Utilization ratio.Compensation economizer 22, when boiler operatiopn load is unstable, boiler tail are also set up in boiler back end ductwork 1
Smoke temperature fluctuation range in flue 1 is larger, and after the heat exchange of the first economizer 21, SCR inlet smoke temperature can also fluctuate, at this point, can
The opening angle for adjusting compensation storehouse 4 makes compensation economizer 22 work, after overcompensation economizer 22 and the heat exchange of the first economizer 21
Mixed flue gas so that flue-gas temperature is controlled in a metastable range, it is steady to maintain SCR inlet smoke temperature to be in dynamic
Under fixed operating mode, the degree of out of stock reaction will not be caused uncontrollable because of SCR inlet smoke temperature acute variation.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, although ginseng
The utility model is described in detail according to previous embodiment, it for those skilled in the art, still can be with
Technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features.It is all
Within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this practicality
Within novel protection domain.
Claims (6)
1. a kind of classification economizer feed water by-pass temperature-raising device, which is characterized in that including boiler back end ductwork, the first economizer,
Compensate economizer, SCR inlet flue, SCR denitration reactor, the second economizer, feed water by-pass and exhaust pass, first province
Coal device and the compensation economizer are arranged in the boiler back end ductwork, and adjustable open is equipped on the outside of the compensation economizer
The compensation storehouse of angle, the SCR inlet flue connect the boiler back end ductwork, spray ammonia lattice are equipped in the SCR inlet flue
Grid are arranged the SCR denitration reactor after the SCR inlet flue, second province coal are arranged after the SCR denitration reactor
Device, second economizer connect the exhaust pass, and the feed water by-pass includes that the first bypass and second bypass, and described first
Bypass connects first economizer and second economizer, and second bypass connects the compensation economizer and described the
Two economizers.
2. classification economizer feed water by-pass temperature-raising device according to claim 1, which is characterized in that the compensation storehouse includes
Wall and be separately positioned on the wall up and down both sides upper smoke barrier and lower smoke barrier, the upper smoke barrier, the lower block
The side wall of cigarette plate, the wall and the boiler back end ductwork encloses the compensation storehouse, the upper smoke barrier and the lower block
Cigarette plate can be rotated rotating around the wall.
3. classification economizer feed water by-pass temperature-raising device according to claim 2, which is characterized in that further include controller and
SCR inlet flue gas temperature measurement device, the SCR inlet flue gas temperature measurement device are set in the SCR inlet flue, and the SCR enters
Mouth flue gas temperature measurement device connects the controller, and the SCR inlet flue gas temperature measurement device transmits temperature value, institute to the controller
It states controller and is separately connected the upper smoke barrier and the lower smoke barrier, the controller can be surveyed according to the SCR inlet smoke temperature
The temperature value of amount device controls the rotational angle of the upper smoke barrier and the lower smoke barrier.
4. classification economizer feed water by-pass temperature-raising device according to claim 3, which is characterized in that the SCR inlet cigarette
Temperature measurement device is set to the initiating terminal of the SCR inlet flue.
5. classification economizer feed water by-pass temperature-raising device according to claim 1, which is characterized in that the compensation economizer
It is arranged side by side in the boiler back end ductwork with first economizer or so.
6. classification economizer feed water by-pass temperature-raising device according to claim 3, which is characterized in that in first bypass
Equipped with the first regulating valve, second bypass is equipped with the second regulating valve, and the controller is separately connected first regulating valve
With second regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721921299.XU CN207778478U (en) | 2017-12-30 | 2017-12-30 | A kind of classification economizer feed water by-pass temperature-raising device |
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| CN201721921299.XU CN207778478U (en) | 2017-12-30 | 2017-12-30 | A kind of classification economizer feed water by-pass temperature-raising device |
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| CN207778478U true CN207778478U (en) | 2018-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
| CN114321877A (en) * | 2021-11-30 | 2022-04-12 | 上海市特种设备监督检验技术研究院 | An economizer system for low-load denitrification flue gas temperature regulation |
-
2017
- 2017-12-30 CN CN201721921299.XU patent/CN207778478U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321877A (en) * | 2021-11-30 | 2022-04-12 | 上海市特种设备监督检验技术研究院 | An economizer system for low-load denitrification flue gas temperature regulation |
| CN114278956A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for gas boiler and gas boiler |
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