CN201500510U - Low-temperature flue gas heating system used after wet flue gas desulfurization - Google Patents
Low-temperature flue gas heating system used after wet flue gas desulfurization Download PDFInfo
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- CN201500510U CN201500510U CN2009200345815U CN200920034581U CN201500510U CN 201500510 U CN201500510 U CN 201500510U CN 2009200345815 U CN2009200345815 U CN 2009200345815U CN 200920034581 U CN200920034581 U CN 200920034581U CN 201500510 U CN201500510 U CN 201500510U
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- flue gas
- low
- temperature
- absorption tower
- desulfurization
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Abstract
The utility model relates to a low-temperature flue gas heating system used after the wet flue gas desulfurization. An absorption tower outlet is directly connected with a chimney by a pipeline. The pipeline connecting an absorption tower and the chimney is connected with a secondary hot air pipe of a boiler air preheater for heating low-temperature flue gas at the absorption tower outlet. A removal GGH (Gas Gas Heater) of the utility model can completely solve the problems of bad heating effect, unstable desulfurization performance, low availability ratio, uneconomic operation and the like caused by scale formation and blockage of the GGH, and can reduce power consumption of a desulfurization system so as to reduce the station service power consumption rate occupied by the desulfurization system. Moreover, the utility model has flexible adjustability, can heat the temperature of the low-temperature flue gas at the absorption tower outlet of a desulfurization device to a temperature required by safe discharge by changing the amount of extracted secondary air with the change of the boiler load, can heat the temperature of the desulfurization flue gas to above the dew point temperature of the flue gas according to the safety requirements of the chimney so as to avoid performing special anti-corrosion transformation on the chimney, and can improve the lifting and diffusion effects of the flue gas after desulfurization.
Description
Technical field
The utility model belongs to the Coal,steam plant with FGD field of engineering technology, is specifically related to the low-temperature flue gas heating system behind a kind of wet process of FGD.
Background technology
At present the thermal power plant wet flue gas desulfurizer adopt mostly GGH add low-temperature flue gas behind the thermally desulfurizing with weaken flue gas in chimney coagulability and improve the lifting emission effect of flue gas.From operational effect, many devices all exist because GGH fouling, the problem of stopping up that heating weak effect, desulfurization performance instability, the availability cause are not high, operation is uneconomical etc.Many power plant are subjected to the puzzlement of GGH fouling blockage problem for a long time, frequent desulfurizer is stopped transport washed, during this period, desulfurizer is forced to stop transport, have only and open the normal operation that the bypass flue just is unlikely to have influence on main frame, but caused the serious environmental pollution like this, in environmental requirement strict day by day today, this situation is having a strong impact on the economic interests even the ordinary production of enterprise.The GGH heat exchange element itself is easily stifled resistance element, under the prerequisite that appearance and size is determined, heat exchange effect and its resistance are a pair of intrinsic contradiction, in order to guarantee enough thermal effects that adds, heat exchange element must have enough height and as far as possible little through-flow gap, thereby the increase heat exchange area, but the increase of resistance that reduces directly to cause GGH of the increase of heat exchange element height and through-flow gap causes the generation of easy fouling and stopping state.Cancellation GGH and do not have power plant under the situation of effective heater means and must consider low-temperature flue gas carefully the burn into low-temperature flue gas of chimney is discharged the discharging diffusion behind the chimney and the preservative treatment of chimney, otherwise will bring new problem to power plant.To fundamentally eliminate the GGH fouling, stop up problem and hidden danger that desulfurizer is brought, must seek a kind of brand-new, more economical flue gas mode of heating, thereby thoroughly change existing GGH mode of heating.
The utility model content
The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, provides a kind of and can thoroughly solve because of the GGH fouling, stopped up the low-temperature flue gas heating system behind the wet process of FGD of problems such as heating weak effect, desulfurization performance instability, the availability cause are not high, operation is uneconomical.
For achieving the above object, the technical solution adopted in the utility model is: comprise deduster and the absorption tower that is connected with deduster, the outlet on absorption tower is connected with chimney by the road, is connected with the hot secondary air channel of the boiler air preheater that is used to heat absorption tower outlet low-temperature flue gas on the pipeline that the clean flue gas flue before the absorption tower enters chimney is the absorption tower with chimney is connected.
Also be connected with the flat GGH heat exchange element in big gap on absorption tower of the present utility model inlet and the export pipeline; On the hot secondary air channel of boiler air preheater hot secondary air adjustor valve is installed also.
Because the utility model has been removed the GGH heat exchange element or original GGH heat exchange element is replaced by the heat exchange element in big gap, gap, adopt the low-temperature flue gas behind the hot secondary wind heating wet process of FGD; More than two kinds of schemes all can thoroughly solve or effectively solve because of the GGH fouling, stop up problems such as the heating weak effect, desulfurization performance instability, the availability that cause are not high, operation is uneconomical, can reduce the desulphurization system power consumption, thereby reduce the shared station service power consumption rate of desulphurization system; And the utlity model has controllability flexibly, the low-temperature flue gas of desulfurizer absorbing tower outlet can be heated to the required temperature of safety dumping along with what that extract secondary wind the variation of boiler load change; Can the desulfurization flue-gas temperature be heated to more than the flue gas dew point according to the security needs of chimney, chimney be carried out special anticorrosion transformation thereby remove from; Can improve the lifting and the diffusion effect of flue gas after desulfurization, weaken or eliminate chimney " rain gypsum " phenomenon.
Description of drawings
Fig. 1 is the schematic diagram of the utility model embodiment 1;
Fig. 2 is the schematic diagram of the utility model embodiment 2.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Embodiment 2, referring to Fig. 2, the utility model keeps GGH, change original GGH heat exchange element into gap bigger flat GGH heat exchange original paper, but the effect of heat exchange just decreases like this, on the pipeline that GGH exports with chimney is connected, be connected with this moment and be used to heat the hot secondary air channel that GGH exports the boiler air preheater of low-temperature flue gas, on the hot secondary air channel of boiler air preheater hot secondary air adjustor valve is installed also, promptly extracts a certain amount of hot secondary wind and heat desulfurizer absorbing tower outlet low-temperature flue gas to temperature required from the outlet of boiler air preheater.Its running is: flue gas enters the flat GGH heat exchange element 3 in big gap and sends into absorption tower 2 after deduster 1 dedusting, the flat GGH heat exchange element 3 in the big gap of low-temperature flue gas warp after 2 desulfurization of absorption tower and pipeline are to chimney 4, owing to used the flat GGH heat exchange element in big gap this moment instead, so the flue gas of output does not also reach required temperature, therefore the utility model is connected with the hot secondary air channel 5 of the boiler air preheater that is used to heat absorption tower outlet low-temperature flue gas on absorption tower 2 and pipeline that chimney 4 is connected, arrives temperature required by the hot secondary wind heating low-temperature flue gas of introducing.
The utility model is removed GGH or is kept GGH but the bigger flat GGH heat exchange original paper in employing gap, can thoroughly solve because of the GGH fouling, stop up problems such as heating weak effect, desulfurization performance instability, the availability cause are not high, operation is uneconomical, thereby or the obstruction cycle that prolongs GGH greatly reduce because of obstruction and cause desulfurizer flushing environmental protection risk and the economic loss brought of frequently stopping transport; Because the desulphurization system resistance reduces greatly after removing GGH or changing the bigger flat heat exchange original paper in gap, can reduce the desulphurization system power consumption, thereby reduces the shared station service power consumption rate of desulphurization system; And the utlity model has controllability flexibly, the low-temperature flue gas of desulfurizer outlet can be heated to the required temperature of safety dumping along with what that extract secondary wind the variation of boiler load change; Also can the desulfurization flue-gas temperature be heated to more than the flue gas dew point, chimney be carried out special anticorrosion transformation thereby remove from according to the security needs of chimney; Can improve the lifting and the diffusion effect of flue gas after desulfurization, weaken or eliminate chimney " rain gypsum " phenomenon.
Usually the discharging flue-gas temperature after guaranteeing to heat behind the thermal power plant desulfurizer employing GGH is more than 72 ℃ or 80 ℃, therefore, in the enforcement link of the present utility model related extraction secondary wind how much be to guarantee after the final Hybrid Heating that the flue gas mean temperature reaches 72 ℃ or 80 ℃ or required higher temperature is (this Hybrid Heating temperature is decided according to the requirement of local atmospheric environment, fume emission and lifting effect and environmental administration) determined of prerequisite.What of the hot secondary air flow that calculates according to flue gas flow, flue-gas temperature, the flue gas composition of desulfurizer absorbing tower outlet in the technology implementation process and determine to be extracted.
Claims (3)
1. the low-temperature flue gas heating system behind the wet process of FGD, comprise deduster (1) and the absorption tower (2) that is connected with deduster (1), the outlet on absorption tower (2) is connected with chimney (4) by the road, it is characterized in that: be connected with on absorption tower (2) pipeline that to enter clean flue gas flue before the chimney be absorption tower (2) with chimney (4) is connected and be used to heat the hot secondary air channel (5) that the absorption tower exports the boiler air preheater of low-temperature flue gas.
2. the low-temperature flue gas heating system behind the wet process of FGD according to claim 1 is characterized in that: the flat GGH heat exchange element (3) that also is connected with big gap on said absorption tower (2) inlet and the export pipeline.
3. the low-temperature flue gas heating system behind the wet process of FGD according to claim 1 is characterized in that: on the hot secondary air channel (5) of said boiler air preheater hot secondary air adjustor valve is installed also.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200345815U CN201500510U (en) | 2009-09-17 | 2009-09-17 | Low-temperature flue gas heating system used after wet flue gas desulfurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200345815U CN201500510U (en) | 2009-09-17 | 2009-09-17 | Low-temperature flue gas heating system used after wet flue gas desulfurization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201500510U true CN201500510U (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200345815U Expired - Fee Related CN201500510U (en) | 2009-09-17 | 2009-09-17 | Low-temperature flue gas heating system used after wet flue gas desulfurization |
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| CN (1) | CN201500510U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007726A (en) * | 2011-09-23 | 2013-04-03 | 沈阳铝镁设计研究院有限公司 | Device for preventing wet desulfurization outlet flue from low-temperature corrosion and control method thereof |
-
2009
- 2009-09-17 CN CN2009200345815U patent/CN201500510U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007726A (en) * | 2011-09-23 | 2013-04-03 | 沈阳铝镁设计研究院有限公司 | Device for preventing wet desulfurization outlet flue from low-temperature corrosion and control method thereof |
| CN103007726B (en) * | 2011-09-23 | 2015-08-19 | 沈阳铝镁设计研究院有限公司 | Prevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XI AN XIRE BOILER ENVIRONMENTAL PROT ENGINEERING C Free format text: FORMER OWNER: XI AN THERMAL POWER RESEARCH INSTITUTE CO., LTD. Effective date: 20130805 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130805 Address after: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee after: Xi'an Xire Boiler Environmental Protection Engineering Co., Ltd. Address before: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee before: Xi'an Thermal Power Research Institute Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100609 Termination date: 20140917 |
|
| EXPY | Termination of patent right or utility model |