CN202018050U - Flue gas bypass system for preventing low-temperature corrosion of an air preheater - Google Patents
Flue gas bypass system for preventing low-temperature corrosion of an air preheater Download PDFInfo
- Publication number
- CN202018050U CN202018050U CN 201120066709 CN201120066709U CN202018050U CN 202018050 U CN202018050 U CN 202018050U CN 201120066709 CN201120066709 CN 201120066709 CN 201120066709 U CN201120066709 U CN 201120066709U CN 202018050 U CN202018050 U CN 202018050U
- Authority
- CN
- China
- Prior art keywords
- flue
- gas
- air preheater
- gas bypass
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Air Supply (AREA)
Abstract
The utility model relates to a flue gas bypass system for preventing low-temperature corrosion of an air preheater. A flue gas bypass pipeline is arranged between a boiler shaft flue and the entrance of an initial-end small flue of an air preheater inlet flue gas flow unbalanced control device and is used for communicating the boiler shaft flue and the entrance of the initial-end small flue to lead high-temperature flue gas of the entrance of the flue gas bypass pipeline directly to the entrance of the initial-end small flue of the air preheater inlet flue gas flow unbalanced control device; the flue gas temperature of the entrance of the initial-end small flue is regulated by controlling two strands of flue gas flow at different temperatures so as to achieve the purpose of controlling the exhaust fume temperature of the exit of the initial-end small flue, effectively prevent low-temperature corrosion of the air preheater and substitute more fan heaters or hot air recirculators of a boiler. The exhaust fume temperature of the boiler is prevented from excessively rising, the cost for preventing the air preheater from low-temperature corrosion is reduced as much as possible, so that the total loss is not greater than that of the boiler caused by adopting the fan heaters or the hot air recirculators.
Description
Technical field
The utility model relates to a kind of gas bypass system that is used for coal-burning boiler, is specifically related to a kind of gas bypass system that prevents the air preheater cold end corrosion.
Background technology
Owing to the seasonal variations reason, if the wind pushing temperature of boiler is not controlled, in an annual period of unit operation, the amplitude of variation of exhaust gas temperature can reach more than 40 ℃, in this case, boiler operatiopn can't take into account the stifled grey problem of cold end corrosion of operating thermal efficiency and air preheater.In order to address this problem, method in common is that steam air heater or hot blast recirculating system are set in the boiler supply air system at present, so that improve the wind pushing temperature of boiler in the winter time by steam air heater or hot blast recirculating system, and exhaust gas temperature is controlled at more than the flue gas acid dew point temperature, with cold end corrosion and the stifled grey problem that solves air preheater; In other season, then close steam air heater or hot blast recirculating system, to reduce exhaust gas temperature, improve boiler thermal output.
No matter be steam air heater or hot blast recirculating system, it all is that exhaust gas temperature raises when putting into operation, and the unit station service increases, and the performance driving economy of unit is reduced; When not putting into operation, steam air heater increases the power consumption of boiler supply air system; The power consumption that also makes supply air system increases the hot blast recirculating system because air door leaks out, and exhaust gas temperature slightly raises, and increases the unit operation loss in rain.No matter this shows, be steam air heater or hot blast recirculating system, when unit operation, all can have influence on the performance driving economy of unit.This cost only pay just exhaust gas temperature (its essence is the stifled ash of the cold end corrosion that prevents air preheater), the safe operation of protection boiler and air preheater in order to improve boiler in the winter time.
In order to address the above problem, the inventor has invented the non-equilibrium control device of air preheater inlet flue gas flow in the past, this device can improve the exhaust gas temperature of the stifled grey deathtrap of air preheater cold end corrosion, thereby improves the anti-cold end corrosion ability of air preheater.When steam air heater or hot blast recirculating system in the annual cycle time of putting into operation be no more than 2 when all, adopt this Apparatus and system might substitute the steam air heater or the hot blast recirculating system of boiler, eliminate both whole adverse effects of back; But the time of putting into operation when steam air heater or in the hot blast recirculating system cycle in every year is when all above 2, this device is because the restriction of the amplitude of accommodation, can only shorten putting into operation the time of steam air heater or hot blast recirculating system, reduce its loss that puts into operation, but still can't reduce the economic loss that steam air heater or hot blast recirculating system cause during not putting into operation.
In order to address the above problem better, make the non-equilibrium control device of air preheater inlet flue gas flow can replace the steam air heater or the hot blast recirculating system of more boilers, just must improve the regulating power of this device, the fume side initial end bottom flue that promptly improves the non-equilibrium control device of air preheater inlet flow rate is (promptly with the corresponding little exhaust gases passes in air preheater cold end corrosion deathtrap, be designated hereinafter simply as the initial end bottom flue) entrance flue gas temperature, and then improve the anti-cold end corrosion ability of its outlet exhaust gas temperature and air preheater greatly.This is very important to the fortune economy of raising combustion unit and the security of air preheater, and security and the economy that improves the coal-burning boiler operation had great practical significance.
Summary of the invention
The purpose of this utility model is at the problems referred to above, and a kind of gas bypass system that does not need external power and can prevent the air preheater cold end corrosion is provided.
For achieving the above object, the technical solution adopted in the utility model is: be provided with the gas bypass pipeline that the boiler vertical well gas flue and the initial end bottom flue of the non-equilibrium control device of air preheater inlet flue gas flow are entered the mouth and be connected between the initial end bottom flue inlet of boiler vertical well gas flue and the non-equilibrium control device of air preheater inlet flue gas flow, the high-temperature flue gas direct short-circuit of inlet that makes the gas bypass pipeline is to the initial end bottom flue of the non-equilibrium control device of air preheater inlet flue gas flow inlet, by controlling the flow of the different flue gas of two bursts of temperature, regulate the flue-gas temperature of this initial end bottom flue inlet, and then reach the purpose of this initial end bottom flue outlet exhaust gas temperature of control.
The inlet of described gas bypass pipeline is the economizer gas approach.
The inlet of described gas bypass pipeline is the low temperature superheater gas approach.
The inlet of described gas bypass pipeline is the low-temperature reheater gas approach.
The inlet of described gas bypass pipeline is vertical well gas flue corner chamber.
The exhaust gas volumn that described gas bypass pipeline is passed through is 1% to 5% of the total exhaust gas volumn of boiler, and its temperature is 550-900 ℃.
Described gas bypass pipeline also is provided with gas bypass stop valve and gas bypass adjustment doors.
The utility model utilizes self pressure drop of boiler smoke system to set up a kind of gas bypass pipeline that does not need external power in boiler flue, regulate fume side initial end bottom flue (the promptly corresponding little exhaust gases passes of the non-equilibrium control device of air preheater inlet flue gas flow with it with the cold end corrosion deathtrap, be designated hereinafter simply as the initial end bottom flue) entrance flue gas temperature, and control the exhaust gas temperature of this initial bottom flue outlet in conjunction with the latter's flow regulating function.
Have following technical characterstic:
1, the utility model is set up the gas bypass system in the boiler smoke system, and is used in combination with non-equilibrium control device of air preheater inlet flue gas flow and system.The high relatively flue gas of any locational temperature of boiler vertical well gas flue directly can be sent to the initial end bottom flue inlet of the non-equilibrium control device of air preheater inlet flue gas flow by this gas bypass system.
2, gas bypass of the present utility model can be regulated the entrance flue gas temperature of the non-equilibrium control device initial end of air preheater inlet flue gas flow bottom flue, and then regulate the exhaust gas temperature of its outlet, the amplitude of accommodation of the exhaust gas temperature of this initial end bottom flue outlet is increased greatly, and then to replace the steam air heater or the hot blast EGR of more coal-burning boilers.
3, all delivering to the air preheater inlet with the flue gas that whole temperature are higher compares, the gas bypass of the present utility model system only flue gas (1% to 5%) of the minute quantity that temperature is higher sends into the initial end bottom flue of the non-equilibrium control device of air preheater inlet flue gas flow, like this, under the identical condition of the economic loss that must pay, can doubly improve the stifled grey ability of air preheater opposing cold end corrosion by 2-3.Preventing under the same effect of cold end corrosion that promptly its cost of paying is reduced to original 1/2 or 1/3.
4, when putting into operation, compare with hot air circulating system with steam air heater (this obviously increases SR), gas bypass of the present utility model system slightly reduces the resistance of flue gas system; Its boiler heat extraction loss increases to some extent, and feed temperature reduction etc. also causes certain heat loss, but compares with the loss that steam air heater and hot air circulating system cause, and confirms as calculated, and the summation of its loss is still less than both losses of back.When not putting into operation, gas bypass of the present utility model system only has flue gas to be leaked to very little loss of initial end bottom flue inlet (because the differential pressure of gas bypass is very little, its amount of leakage is very little), and this loss reduces the resistance of flue gas system, and the summation of its loss is still little than both losses of back.
5, gas bypass of the present utility model system is without any need for external power, the differential pressure automatic transport of the flue gas utilization system in the bypass, and can realize the dial plate operation.
Description of drawings
Fig. 1 is a structural representation of the present utility model:
Number in the figure 1-air preheater exhaust pass, 2-air preheater, the non-equilibrium control device of 3-air preheater inlet flow rate, 4-air preheater inlet flue duct, 5-gas bypass cut-off gate; 6-gas bypass adjustment doors; 7-gas bypass pipeline.
The utility model is described in further detail below in conjunction with accompanying drawing.
The specific embodiment
The arrival end of gas bypass pipeline of the present utility model is connected with the boiler vertical well gas flue, its port of export is connected with the initial end bottom flue inlet of air preheater inlet flue gas volume control device 3, gas bypass cut-off gate 5 and gas bypass adjustment doors 6 are set on gas bypass pipeline 7, enter the bypass flue gas flow and the entrance flue gas temperature thereof of the initial end bottom flue inlet of air preheater inlet flue gas volume control device 3 with control, and then reach the purpose of its outlet exhaust gas temperature of control.This system can increase other auxiliary equipment or control system on the basis of basic equipment.
Below be the embodiment that the inventor provides.
Embodiment:
Referring to Fig. 1, present embodiment has 1 road gas bypass pipeline 7, corresponding respectively being arranged on the flue of boiler first and second both sides, and Fig. 1 only provides a side, and opposite side and Fig. 1 are identical.When the exhaust gas temperature of the initial end bottom flue that does not need to improve the non-equilibrium control device 3 of air preheater inlet flow rate, this system disappears the effect of gas bypass pipeline 7 by being arranged on gas bypass cut-off gate 5 on the gas bypass pipeline 7, make the boiler smoke system return to transformation before; When needed, gas bypass cut-off gate 5 in its gas bypass pipeline 7 is opened, and controls the flue gas flow that enters the non-equilibrium control device 3 initial end bottom flues of air preheater inlet flow rate by gas bypass pipeline 7 by the gas bypass adjustment doors 6 that is arranged on the gas bypass pipeline 7.This bypass flue gas with enter the non-equilibrium control device 3 of air preheater inlet flow rate by air preheater gas approach 4 in the flue gas of initial end bottom flue mix, reach the purpose of regulating its flue-gas temperature, mixed flue gas makes by the non-equilibrium control device 3 of air preheater inlet flow rate and enters air preheater 2, the heat accumulation plate temperature of cold end corrosion deathtrap in the air preheater 2 is raise, simultaneously, make in the air preheater exhaust pass 1 and raise with the corresponding outlet exhaust gas temperature of initial end bottom flue, the final cold end corrosion problem that effectively solves air preheater cold end corrosion hazardous area, and then the anti-cold end corrosion ability of whole air preheater 2 is improved.
Operation principle of the present utility model is as follows:
The utility model is controlled the flue-gas temperature that enters the non-equilibrium control device initial end of air preheater inlet flue gas flow bottom flue by the gas bypass and the adjustment doors thereof that are installed on the air preheater gas approach, and control the flue gas flow of this bottom flue, and then regulate the flue-gas temperature (being exhaust gas temperature) of this initial end bottom flue outlet by the latter.When improving this initial end bottom flue flue-gas temperature by gas bypass or pass through the non-equilibrium control device raising of air preheater inlet flue gas flow initial end bottom flue flue gas flow, the exhaust gas temperature of this initial end bottom flue outlet raises, and the ability of the anti-cold end corrosion of air preheater strengthens; Otherwise the exhaust gas temperature of this initial end bottom flue outlet reduces.
Compare with the flue gas system of existing equipment, after adopting the utility model, the total flue gas flow that enters air preheater is constant, and the entrance flue gas temperature of other bottom flue is unadjustable in the non-equilibrium control device of air preheater inlet flue gas flow, and with do not adopt before this gas bypass system identical; But the entrance flue gas temperature of the non-equilibrium control device initial end of air preheater inlet flue gas flow bottom flue can carry out by a relatively large margin adjusting by the gas bypass system, thereby reaches the purpose of the exhaust gas temperature of controlling this initial end outlet bottom flue by a relatively large margin.
Gas bypass of the present utility model system is very simple, easy to implement, very suitable active service boiler improvement and newly constructed boiler.For the active service boiler, it is very easy to construct, and the boiler flue external form is not changed; And do not need to increase power-equipment, do not need to transform induced draught system yet, be convenient to very much implement.For the then easier enforcement of newly constructed boiler.
Gas bypass of the present utility model system is adapted to the boiler of the various combustion systems of various capacity.
Claims (7)
1. gas bypass system that prevents the air preheater cold end corrosion, it is characterized in that: between the initial end bottom flue inlet of boiler vertical well gas flue and the non-equilibrium control device of air preheater inlet flue gas flow (3), be provided with the gas bypass pipeline (7) that the boiler vertical well gas flue and the initial end bottom flue of the non-equilibrium control device of air preheater inlet flue gas flow (3) are entered the mouth and be connected, the high-temperature flue gas direct short-circuit of inlet that makes gas bypass pipeline (7) is to the initial end bottom flue of the non-equilibrium control device of air preheater inlet flue gas flow (3) inlet, by controlling the flow of the different flue gas of two bursts of temperature, regulate the flue-gas temperature of this initial end bottom flue inlet, and then reach the purpose of this initial end bottom flue outlet exhaust gas temperature of control.
2. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: the inlet of described gas bypass pipeline (7) is the economizer gas approach.
3. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: the inlet of described gas bypass pipeline (7) is the low temperature superheater gas approach.
4. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: the inlet of described gas bypass pipeline (7) is the low-temperature reheater gas approach.
5. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: the inlet of described gas bypass pipeline (7) is vertical well gas flue corner chamber.
6. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: the exhaust gas volumn that described gas bypass pipeline (7) is passed through is 1% to 5% of the total exhaust gas volumn of boiler, and its temperature is 550-900 ℃.
7. the gas bypass system that prevents the air preheater cold end corrosion according to claim 1 is characterized in that: described gas bypass pipeline (7) also is provided with gas bypass stop valve (5) and gas bypass adjustment doors (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120066709 CN202018050U (en) | 2011-03-17 | 2011-03-17 | Flue gas bypass system for preventing low-temperature corrosion of an air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120066709 CN202018050U (en) | 2011-03-17 | 2011-03-17 | Flue gas bypass system for preventing low-temperature corrosion of an air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202018050U true CN202018050U (en) | 2011-10-26 |
Family
ID=44811720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120066709 Expired - Fee Related CN202018050U (en) | 2011-03-17 | 2011-03-17 | Flue gas bypass system for preventing low-temperature corrosion of an air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202018050U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017137A (en) * | 2012-12-27 | 2013-04-03 | 青岛胜利锅炉有限公司 | Low-temperature corrosion resisting structure of boiler |
| CN109724098A (en) * | 2019-01-22 | 2019-05-07 | 哈尔滨广瀚动力技术发展有限公司 | Cure useless waste heat boiler exhaust gas temperature control system |
-
2011
- 2011-03-17 CN CN 201120066709 patent/CN202018050U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017137A (en) * | 2012-12-27 | 2013-04-03 | 青岛胜利锅炉有限公司 | Low-temperature corrosion resisting structure of boiler |
| CN109724098A (en) * | 2019-01-22 | 2019-05-07 | 哈尔滨广瀚动力技术发展有限公司 | Cure useless waste heat boiler exhaust gas temperature control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102252339B (en) | System for reducing discharge smoke temperature of power station boiler | |
| CN105387629A (en) | Constant-temperature type gas water heater and control method | |
| CN203375426U (en) | Boiler tail structure capable of preventing boiler low-temperature air preheater from low-temperature corrosion | |
| CN205717147U (en) | A kind of full load denitration utilizes and air preheater corrosion-and blocking-prevention coupled system with fume afterheat | |
| CN202018050U (en) | Flue gas bypass system for preventing low-temperature corrosion of an air preheater | |
| CN201163019Y (en) | System connection device of low temperature coal economizer | |
| CN104990063A (en) | Hot primary air waste heat utilization device coupled with air heater system in use | |
| CN204922939U (en) | Wind waste heat utilization equipment of heat with use of fan heater system linking | |
| CN203336572U (en) | Bypass economizer used for comprehensive utilization of flue gas waste heat | |
| CN103808200B (en) | A kind of automatic regulating system controlling heat exchanger Temperature of Working | |
| CN203068475U (en) | Ultrafast gas steam engine | |
| CN204756887U (en) | High -efficient hot media water system of circulating fluidized bed boiler | |
| CN206904943U (en) | Ensure the device of SCR system bringing normally into operation during a kind of depth peak regulation | |
| CN107101192B (en) | A kind of the low-level (stack-gas) economizer system and thermal power plant unit of thermal power plant unit | |
| CN216769474U (en) | Air heater system with variable heat source | |
| CN215411832U (en) | Composite hot water recirculation system for full-load denitration of supercritical power station boiler | |
| CN209909952U (en) | Full operating mode flue gas denitration and air preheater prevent stifled system | |
| CN213657140U (en) | Hydrophily fan heater structure with anti-freezing function | |
| CN204901735U (en) | Heat exchanger boiler waste heat utilization economizer | |
| CN208901364U (en) | A kind of economizer heat water recirculation system suitable for subcritical drum boiler generating set | |
| CN205174319U (en) | Low pressure economizer automatic control device with adjustable | |
| CN203454193U (en) | Secondary air circulating system | |
| CN205065686U (en) | Waste heat type fan heater system | |
| CN204648205U (en) | Steam power plant's back-end ductwork is without pump self-loopa two-way water feeding high/low temperature associating heating system | |
| CN204693969U (en) | Foodstuff drying device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20140317 |