CN109458611A - A kind of device preventing low-temperature coal economizer of boiler dew point corrosion - Google Patents
A kind of device preventing low-temperature coal economizer of boiler dew point corrosion Download PDFInfo
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- CN109458611A CN109458611A CN201811466664.1A CN201811466664A CN109458611A CN 109458611 A CN109458611 A CN 109458611A CN 201811466664 A CN201811466664 A CN 201811466664A CN 109458611 A CN109458611 A CN 109458611A
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- low
- smoke
- economizer
- temperature
- gas
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- 230000007797 corrosion Effects 0.000 title claims abstract description 24
- 238000005260 corrosion Methods 0.000 title claims abstract description 24
- 239000003245 coal Substances 0.000 title claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 24
- 239000000779 smoke Substances 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 239000000567 combustion gas Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 229910006069 SO3H Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000009270 zilongjin Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of devices for preventing low-temperature coal economizer of boiler dew point corrosion, Smoke-heating device including low-level (stack-gas) economizer upstream is arranged in, the smoke temperature measurement device of Smoke-heating device upstream is set, the smoke temperature measurement device and flame detecting device of low-level (stack-gas) economizer entrance are set, and the tube wall temperature measuring device of low-level (stack-gas) economizer tail portion is set.A kind of device preventing low-temperature coal economizer of boiler dew point corrosion provided by the invention, its innovation is, Smoke-heating device can directly heat flue gas, and boiler tail flue gas temperature is accurately improved in the short time, avoid low-level (stack-gas) economizer that dewpoint corrosion occurs.Furthermore, after Smoke-heating device starting, pass through the measured value difference and detection flame attachment between the first smoke temperature measurement device of comparison and the second smoke temperature measurement device, it is ensured that Smoke-heating device starting is normal, prevents unburned fuel from entering boiler tail and occurs to dodge the accidents such as quick-fried.
Description
Technical field
The invention belongs to thermal power generating technology fields, and in particular to a kind of dress for preventing low-temperature coal economizer of boiler dew point corrosion
It sets.
Background technique
Currently, country is increasingly harsh to the power conservation requirement of thermal power generation corporations, the research and development of minimum discharge technology and apply
With fast development.In order to which depth recycles low-grade fume afterheat, elimination chimney " Bai Long " etc., thermal power generation corporations must be installed additional
A series of UTILIZATION OF VESIDUAL HEAT IN and waste heat transfer equipment, the low-level (stack-gas) economizer (hereinafter referred to as low province) of such as minimum discharge technical field
Deng[1]。
Under normal circumstances, low province's work belongs to cryogenic heat exchange equipment in smoke temperature less than under 150 DEG C of environmental condition.Fire
The flue gas that power electricity power enterprise coal-burning boiler generates contains a certain amount of SO3, SO3H can be generated by reacting with vapor2SO4.Work as low temperature
Metal wall surface temperature (the T of economizerW) it is lower than flue gas acid dew point (TG), as soon as surface just will form layer liquid film containing sulfuric acid,
Low-temperature corrosion inevitably occurs.As it can be seen that avoiding low-level (stack-gas) economizer that low-temperature flue gas corrosion key occurs from two aspects, mention
High tube wall temperatures and reduction flue gas dew point temperature, make the former be greater than the latter.Under the certain situations such as burning coal quality, combustion system,
Flue gas dew point temperature can be considered definite value[2].Tube wall temperature is mainly codetermined by feed temperature and flue-gas temperature, wherein feed temperature
From low-pressure heater, 61 DEG C~91 DEG C of low province's feed temperature, 83 DEG C~105 DEG C of exit water temperature, temperature is relatively stable；And flue gas
Temperature is affected by boiler load.With the proposition of unit flexibility, fired power generating unit peak regulation range is continued to increase, long-term low negative
Lotus operation becomes normality, the decline of boiler tail flue gas constant temperature；Part-time during boiler startup, tail flue gas temperature compared with
It is low；The risk that above situation can cause the low province of tail portion that dewpoint corrosion occurs continues to increase.
Bibliography:
[1] Liu Yugang, Luo Zhizhong, Chen Gang, wait low-level (stack-gas) economizer and MGGH run in there are typical problem analysis and countermeasures
The comment of [J] Dongfang Electric, 2016,30 (2): 31-35.
[2] Zhang Zhixiang, Zhang Zhichao drag advance, wait coal-burning boiler dew point corrosion experimental study [J] material engineering, and 2012
(8):19-23.
Summary of the invention
It is an object of the invention in view of the above shortcomings of the prior art, provide one kind to prevent low-temperature coal economizer of boiler from revealing
The device of spot corrosion.
The present invention adopts the following technical scheme that realize:
A kind of device preventing low-temperature coal economizer of boiler dew point corrosion, the flue gas including low-level (stack-gas) economizer upstream is arranged in add
Thermal is arranged in the smoke temperature measurement device of Smoke-heating device upstream, the flue gas of low-level (stack-gas) economizer entrance is arranged in
Temperature measuring device and flame detecting device, and the tube wall temperature measuring device of low-level (stack-gas) economizer tail portion is set.
A further improvement of the present invention lies in that being set to the Smoke-heating device of low-level (stack-gas) economizer upstream as circumferential burning
Device, fuel are natural gas, and auxiliary combustion gas body is air.
A further improvement of the present invention lies in that the quantity of Smoke-heating device is four, along low-level (stack-gas) economizer upstream
It is arranged circumferentially.
A further improvement of the present invention lies in that the first smoke temperature measurement device of Smoke-heating device upstream end is along flue gas
Channel is circumferential every 90 degree of arrangements, one flue-gas temperature measuring point.
A further improvement of the present invention lies in that the second smoke temperature measurement device of low-level (stack-gas) economizer entrance is logical along flue gas
Road is circumferential every 90 degree of arrangements, one flue-gas temperature measuring point.
A further improvement of the present invention lies in that flame detecting device is flame detector, and same using boiler of power plant burner hearth
The flame detector of type.
A further improvement of the present invention lies in that tube wall temperature measuring device is arranged in low-level (stack-gas) economizer tail flue gas channel
It is interior.
A further improvement of the present invention lies in that in use, when boiler at low load operation, outside the pipe of low-level (stack-gas) economizer tail portion
When wall temperature measuring device is shown at a temperature below flue gas dew point temperature alarming value, Smoke-heating device starting adds flue gas
Heat, it is ensured that the detected value of the second smoke temperature measurement device of low-level (stack-gas) economizer entrance be higher than flue gas dew point temperature alarming value with
Flue gas passes through the sum of the theoretical value of low-level (stack-gas) economizer temperature drop；
If after Smoke-heating device starting, the measured value between the first smoke temperature measurement device and flame detecting device
Flame is not observed less than 3 DEG C or flame detecting device, and it is inactive to be considered as Smoke-heating device failure, closes flue gas immediately
Device, and blowing out inspection reparation of selecting a good opportunity.
The present invention has following beneficial technical effect:
A kind of device preventing low-temperature coal economizer of boiler dew point corrosion provided by the invention, innovation be, flue gas
Heating device can directly heat flue gas, and boiler tail flue gas temperature is accurately improved in the short time, and low temperature is avoided to save coal
Dewpoint corrosion occurs for device.
In addition, passing through the first smoke temperature measurement device of comparison and the second flue-gas temperature after Smoke-heating device starting
Measured value difference and detection flame attachment between measuring device, it is ensured that Smoke-heating device starting is normal, prevents unburned combustion
Material enters boiler tail and occurs to dodge the accidents such as quick-fried.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the device for preventing low-temperature coal economizer of boiler dew point corrosion of the present invention.
Fig. 2 is Smoke-heating device position schematic diagram of the present invention.
In figure: 1- Smoke-heating device, 2- the first smoke temperature measurement device, 3- the second smoke temperature measurement device, 4-
Flame detecting device, 5- tube wall temperature measuring device, 6- low-level (stack-gas) economizer.
Specific embodiment
The present invention is made further instructions below in conjunction with attached drawing.
As shown in Figure 1, a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion provided by the invention, including setting exist
The first smoke temperature measurement device of 1 upstream of Smoke-heating device is arranged in the Smoke-heating device 1 of 6 upstream of low-level (stack-gas) economizer
2, the second smoke temperature measurement device 3 and flame detecting device 4 of 6 import of low-level (stack-gas) economizer are set, and are arranged in low temperature
The tube wall temperature measuring device 5 of 6 tail portion of economizer.
When in use, when boiler at low load is run, the tube wall temperature measuring device 5 of 6 tail portion of low-level (stack-gas) economizer is shown
(T when at a temperature below flue gas dew point temperature alarming valueG+ 5 DEG C), flue gas is heated in the starting of Smoke-heating device 1, it is ensured that low
The detected value of second smoke temperature measurement device 3 of warm 6 entrance of economizer is higher than (TG+5+ΔTSDEG C, Δ TSFor flue gas process
The theoretical value of low-level (stack-gas) economizer temperature drop).After if Smoke-heating device 1 started, the first smoke temperature measurement device 2 and the second cigarette
Measured value between gas temperature measuring device 3 does not observe flame less than 3 DEG C or flame detecting device 4, is considered as flue gas dress
It is inactive to set 1 failure, closes Smoke-heating device 1, and blowing out inspection reparation of selecting a good opportunity immediately.
Preferably, the Smoke-heating device 1 of 6 upstream of low-level (stack-gas) economizer is arranged in as circumferential burner, fuel is natural gas,
Auxiliary combustion gas body is air, is matched depending on gas component, and ensures that its excess air coefficient is greater than 5%.Flue gas
The flame that device 1 generates should be uniform, it is ensured that flue gas is heated properly, as shown in Figure 2.
Preferably, the of 6 entrance of the first temperature measuring device 2 and low-level (stack-gas) economizer of 1 upstream end of Smoke-heating device
Two smoke temperature measurement devices 3 are circumferential every 90 degree of arrangements, one flue-gas temperature measuring point along exhaust gases passes, take 4 measuring points average
Value.
Preferably, flame detecting device 4 is flame detector, and using the fire defector of boiler of power plant burner hearth same type
Device.
Preferably, tube wall temperature measuring device 5 is arranged in 6 tail flue gas channel of low-level (stack-gas) economizer.Recommend using electricity
It stands common wall temperature measurement device in boiler penthouse, and suggests being mounted on the outside of flue gas flow direction downstream tube, to avoid sweep of gases
Damage to the device.
Claims (8)
1. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion, which is characterized in that including being arranged in low-level (stack-gas) economizer (6)
The smoke temperature measurement device (2) in Smoke-heating device (1) upstream is arranged in the Smoke-heating device (1) of upstream, is arranged low
The smoke temperature measurement device (3) and flame detecting device (4) of warm economizer (6) entrance, and be arranged in low-level (stack-gas) economizer
(6) the tube wall temperature measuring device (5) of tail portion.
2. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that setting
Smoke-heating device (1) in low-level (stack-gas) economizer (6) upstream is circumferential burner, and fuel is natural gas, and auxiliary combustion gas body is air.
3. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that flue gas
The quantity of heating device (1) is four, along being arranged circumferentially for low-level (stack-gas) economizer (6) upstream.
4. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that flue gas
The first smoke temperature measurement device (2) of heating device (1) upstream end is circumferential every 90 degree of arrangements, one flue gas along exhaust gases passes
Temperature point.
5. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that low temperature
The second smoke temperature measurement device (3) of economizer (6) entrance is circumferential every 90 degree of arrangements, one flue gas temperature along exhaust gases passes
Spend measuring point.
6. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that flame
Detection device (4) is flame detector, and using the flame detector of boiler of power plant burner hearth same type.
7. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that pipe is outer
Wall temperature measuring device (5) is arranged in low-level (stack-gas) economizer (6) tail flue gas channel.
8. a kind of device for preventing low-temperature coal economizer of boiler dew point corrosion according to claim 1, which is characterized in that use
When, when boiler at low load operation when, low-level (stack-gas) economizer (6) tail portion tube wall temperature measuring device (5) display at a temperature below
When flue gas dew point temperature alarming value, flue gas is heated in Smoke-heating device (1) starting, it is ensured that low-level (stack-gas) economizer (6) import
The detected value of the second smoke temperature measurement device (3) at place is higher than flue gas dew point temperature alarming value and flue gas passes through low-level (stack-gas) economizer
The sum of theoretical value of temperature drop；
If after Smoke-heating device (1) starting, between the first smoke temperature measurement device (2) and flame detecting device (3)
Measured value is less than 3 DEG C or flame detecting device (4) does not observe flame, and it is inactive to be considered as Smoke-heating device (1) failure, immediately
It closes Smoke-heating device (1), and blowing out inspection reparation of selecting a good opportunity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811466664.1A CN109458611A (en) | 2018-12-03 | 2018-12-03 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811466664.1A CN109458611A (en) | 2018-12-03 | 2018-12-03 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109458611A true CN109458611A (en) | 2019-03-12 |
Family
ID=65612277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811466664.1A Pending CN109458611A (en) | 2018-12-03 | 2018-12-03 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109458611A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007248017A (en) * | 2006-03-18 | 2007-09-27 | Mitsui Eng & Shipbuild Co Ltd | Temperature controller for fuel economizer of reheat boiler |
| CN203823738U (en) * | 2014-05-19 | 2014-09-10 | 湖北国众科技股份有限公司 | Novel flue gas waste heat recovering system |
| CN206291196U (en) * | 2016-12-16 | 2017-06-30 | 青岛全能节能环保锅炉有限公司 | A kind of new economizer anti-low-temperature corrosion control device |
| CN206803202U (en) * | 2017-06-06 | 2017-12-26 | 烟台龙源电力技术股份有限公司 | Steam generator system |
| CN206929761U (en) * | 2017-05-19 | 2018-01-26 | 甘肃蓝科石化高新装备股份有限公司 | A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device |
| CN209371219U (en) * | 2018-12-03 | 2019-09-10 | 西安热工研究院有限公司 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
-
2018
- 2018-12-03 CN CN201811466664.1A patent/CN109458611A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007248017A (en) * | 2006-03-18 | 2007-09-27 | Mitsui Eng & Shipbuild Co Ltd | Temperature controller for fuel economizer of reheat boiler |
| CN203823738U (en) * | 2014-05-19 | 2014-09-10 | 湖北国众科技股份有限公司 | Novel flue gas waste heat recovering system |
| CN206291196U (en) * | 2016-12-16 | 2017-06-30 | 青岛全能节能环保锅炉有限公司 | A kind of new economizer anti-low-temperature corrosion control device |
| CN206929761U (en) * | 2017-05-19 | 2018-01-26 | 甘肃蓝科石化高新装备股份有限公司 | A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device |
| CN206803202U (en) * | 2017-06-06 | 2017-12-26 | 烟台龙源电力技术股份有限公司 | Steam generator system |
| CN209371219U (en) * | 2018-12-03 | 2019-09-10 | 西安热工研究院有限公司 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
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