CN202195471U - System for optimizing and using energy in station boiler - Google Patents
System for optimizing and using energy in station boiler Download PDFInfo
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- CN202195471U CN202195471U CN201120301100XU CN201120301100U CN202195471U CN 202195471 U CN202195471 U CN 202195471U CN 201120301100X U CN201120301100X U CN 201120301100XU CN 201120301100 U CN201120301100 U CN 201120301100U CN 202195471 U CN202195471 U CN 202195471U
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Abstract
The embodiment of the utility model provides a system for optimizing and using energy in a station boiler, and relates to the technical field of station boilers. The system mainly recovers and uses waste heat of smoke exhausted from a boiler system for heating combustion air. As for a large-scale station boiler taking power generation as a main purpose, the waste heat exhausted from a boiler system is recovered and used for heating the combustion air and sending the combustion air to a hearth, so that energy conservation is realized and the heat efficiency of the station boiler is improved. On the other hand, the embodiment of the utility model also has the advantages that the energy conservation is realized, the heat efficiency of the station boiler is improved, the difference such as seasons and load of the smoke exhaust temperature is balanced by introducing heat energy of condensation water, the problem that the overhigh smoke exhaust temperature in summer leads to the damage to tail gas processing equipment can be solved, the problem that overhigh back pressure of a steam turbine in summer leads to the lowered power generation efficiency of a low-pressure cylinder of the steam turbine is relieved, a steam air heater with high probability of failure in winter can be replaced, and the system property of the station boiler is further improved.
Description
Technical field
The utility model relates to the station boiler technical field, particularly relates to a kind of energy-optimised system that utilizes of station boiler.
Background technology
As everyone knows, large-sized station boiler mainly is coal-powder boiler and CFBB at present, and under the prerequisite of good operation, the thermal efficiency of these boilers is greater than 90%.Its main heat loss derives from two aspects: heat loss due to unburned carbon and heat loss due to exhaust gas.Here, heat loss due to exhaust gas has accounted for the overwhelming majority, about 50-70%.Flue gas waste heat recovery promptly is through heat exchanger heat removal from flue gas, reduces exhaust gas temperature, improves the thermal efficiency of boiler.
Heat exchanger reclaims this part heat, can be used to add various low-temperature receivers such as hot water or combustion air.But,, only have condensate and combustion air to have enough amounts can take away the heat that takes out in the flue gas for being the main large-scale gas formula unit that coagulates with the generating.During heat-setting water, two problems are arranged: the one, the low exhaust that adds of the final stage of practicing thrift belongs to the low-quality energy, causes the service efficiency of recovery waste heat very low; The 2nd, the low condensate that adds inlet of heating final stage has reduced that final stage is low to add the cooling effect to the steam turbine exhaust, can cause the rising of steam turbine back pressure, reduces the generating efficiency of steam turbine low pressure (LP) cylinder, may cause and the antipodal result of energy-conservation original intention.And, send this part heat back to burner hearth with recovery waste heat heating combustion air, often can obtain good energy saving profit.
At present sack cleaner is widely used in large-sized station boiler, and along with the raising of environmental protection standard, increasing electric cleaner has the trend that is transformed into electric bag dust collector.Exhaust gas temperature is too high, and is very big to the harm of cloth bag, and when the inlet temperature of sack cleaner was higher than 170 ℃, the life-span of cloth bag can reduce greatly; For wet desulphurization, higher exhaust gas temperature means the increase that sprays desuperheating water, and this is a no small spending in the water-deficient area.Therefore, exhaust gas temperature is controlled in the normal scope, not only can be energy-conservation, also help the normal operation of boiler exhaust gas treatment system.
Along with the growth of boiler operatiopn time, the inleakage of former air preheater can increase, and the tube wall dust stratification can reduce the heat transfer efficiency of air preheater simultaneously, and these reasons can cause the runtime value of hot blast temperature to be lower than design load.Adopt fume afterheat heating combustion air, generally can not cause harmful effect the operation of boiler.For coal-powder boiler, heat one time wind, can improve the operation of coal pulverizer; Heating one, secondary wind can improve efficiency of combustion, and is also beneficial to augmentation of heat transfer.
In order to prevent that winter, cold end corrosion appearred in air preheater, general large-sized station boiler all is furnished with steam air heater.But steam air heater is owing to hydrophobic reason is prone to leakage, and interrelated data shows that power plant's steam air heater more than half can not normally move.Winter, heat combustion air with fume afterheat, steam air heater can be stopped using, and is not only energy-conservation, also helps the normal operation of steam generator system.
Generally speaking, the difference in summer in exhaust gas temperature winter of boiler is very big.Summer, exhaust gas temperature was high, and winter, exhaust gas temperature was low.For being main gas formula unit with fixed attention with the generating, the load in summer is high, and the load in winter is low, has more aggravated the difference in season of exhaust gas temperature.This just causes former flue gas waste heat recovery system, when summer, exhaust gas temperature was too high, surpasses the design load of system, and exhaust gas temperature crosses that flue gas waste heat recovery system can not get coming into operation when low in the winter time.The utility model comes this species diversity of balance through the heat of introducing condensate.
See from the angle of energy quality, pressure, the working medium that temperature grade is high more, " fire is used " value is high more.The steam turbine heat regenerative system has been used this principle just.Generally speaking, steam air heater bleed pressure value more than 1MPa, temperature belongs to high-quality steam about 300 ℃; And the parameter of bleeding of low-pressure heater (particularly final stage low adds), temperature and pressure is much lower than the steam air heater parameter of bleeding.Therefore, consuming the inferior energy more, substitute the high-quality energy, is a kind of energy-conservation mode.
The utility model content
The utility model embodiment provides a kind of station boiler the energy-optimised system that utilizes, and further improves the technology of the station boiler thermal efficiency so that a kind of energy energy-conservation and that optimization utilization is reclaimed to be provided.
For realizing above-mentioned purpose, the utility model embodiment provides following scheme:
A kind of energy-optimised system that utilizes of station boiler comprises:
The combustion air heater is used to heat combustion air;
The fume afterheat processing module is used for utilizing the heat condensate of flue gas;
The condensate processing module is used for drawing condensate according to the output of control module from the inlet of different low-pressure heaters, and after said combustion air heater output, sends said condensate of drawing the inlet of different low-pressure heaters back to;
Control module is used for controlling according to the work at present situation operation of said fume afterheat processing module and said condensate processing module;
The condensate booster pump is used under the control of said control module, with the condensate that the condensate and/or the said condensate processing module of said fume afterheat processing module output are drawn, imports said combustion air heater with the heating combustion air.
According to the specific embodiment that the utility model provides, following technique effect is disclosed:
Discharge the waste heat of flue gas among the utility model embodiment in the main recovery boiler system, in order to the heating combustion air.For being for the main large-sized station boiler with the generating, recovery boiler system is discharged the waste heat of flue gas in order to the heating combustion air, sends the combustion air after the heating back to burner hearth, thereby realizes energy-conservationly, improves the utility model purpose of the station boiler thermal efficiency.On the other hand; The utility model embodiment can also realize energy-conservation, improve the station boiler thermal efficiency in; Come balance because differences such as the season of exhaust gas temperature and loads through the heat of introducing condensate; Can solve the problem of the too high harm tail gas treatment device that causes of exhaust gas temperature in summer or alleviate the too high problem that causes that steam turbine low pressure (LP) cylinder generating efficiency reduces of turbine back pressure in summer, or substitute winter such as the steam air heater that is prone to break down etc., further improve the systematic function of station boiler.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The energy-optimised system architecture diagram that utilizes of a kind of station boiler that Fig. 1 provides for the utility model embodiment;
The energy-optimised system architecture schematic diagram that utilizes of a kind of station boiler that Fig. 2 provides for the utility model embodiment;
The energy-optimised first kind of mode of operation schematic diagram that utilizes system of the station boiler that Fig. 3 provides for the utility model embodiment;
The energy-optimised second kind of mode of operation schematic diagram that utilizes system of the station boiler that Fig. 4 provides for the utility model embodiment;
Energy-optimised the third mode of operation schematic diagram that utilizes system of the station boiler that Fig. 5 provides for the utility model embodiment;
Energy-optimised the 4th kind of mode of operation schematic diagram that utilizes system of the station boiler that Fig. 6 provides for the utility model embodiment.
The specific embodiment
For purpose, the feature and advantage that make the utility model embodiment can be more obviously understandable, the utility model is done further detailed explanation below in conjunction with the accompanying drawing and the specific embodiment.
Referring to Fig. 1, the utility model embodiment provides a kind of energy-optimised system that utilizes of station boiler, comprising:
Fume afterheat processing module 102 is used for utilizing the heat condensate of flue gas;
Condensate processing module 103 is used for drawing condensate according to the output of control module from the inlet of different low-pressure heaters, and after said combustion air heater 101 outputs, sends said condensate of drawing the inlet of different low-pressure heaters back to;
Control module 104 is used for controlling according to the work at present situation operation of said fume afterheat processing module 102 and said condensate processing module 103;
The core concept of the utility model embodiment is; For being for the main large-sized station boiler with the generating; Recovery boiler system is discharged the waste heat of flue gas in order to the heating combustion air; Send the combustion air after the heating back to burner hearth, thus realize energy-conservation, further improve the utility model purpose of the station boiler thermal efficiency.
On the other hand, the utility model embodiment can also realize energy-conservation, improve the station boiler thermal efficiency in, further improve the systematic function of station boiler.Concrete, the exhaust gas temperature of boiler is also unstable, such as there being the very big problem of difference in summer in winter.Usually, summer, exhaust gas temperature was high, and winter, exhaust gas temperature was low.For being main gas formula unit with fixed attention with the generating, the load in summer is high, and the load in winter is low, has more aggravated the difference in season of exhaust gas temperature.
And this difference be can cause exhaust gas temperature too high the time (like summer), causes endangering tail gas treatment device (reducing greatly like sack cleaner life-span when temperature is too high), the too high problems such as steam turbine low pressure (LP) cylinder generating efficiency reduction that cause of turbine back pressure easily; Exhaust gas temperature is crossed when hanging down (like winter), and the fume afterheat that often reclaims can't satisfy the demand (like demands such as alternative steam air heaters) of system.The utility model embodiment comes this species diversity of balance through the heat of introducing condensate, thereby has further improved the systematic function of station boiler.
Need to prove that the energy that the condensate booster pump is used to provide condensate to flow makes condensate in the system that combustion air heater, fume afterheat processing module and condensate processing module are formed, to flow.
In this system, control module can be selected whether to start the fume afterheat processing module, reach whether start said condensate processing module according to the different working situation.
Wherein, the combustion air heater can be once wind heater or secondary wind heater.The combustion air heater is connected with air preheater import air channel with the blower export air channel respectively.
The fume afterheat processing module specifically comprises: phase-change heat-exchanger and tubular heat exchanger, said phase-change heat-exchanger is connected with said tubular heat exchanger with the liquid down-comer through vapor uptake.
Phase-change heat-exchanger is connected with boiler back end ductwork.
The condensate processing module specifically comprises: send pipeline back to condensate introduction pipe and condensate that the low-pressure heater inlet links to each other.The temperature of the condensate of drawing generally speaking is less than 120 degree.
In the practical application, low-pressure heater can be final stage low-pressure heater and/or inferior final stage low-pressure heater.
The energy that the condensate booster pump provides condensate to flow.The condensate booster pump is specially variable frequency pump.In the practical application, the condensate booster pump is positioned at after the system condensate leading point, so that condensate is drawn from low-pressure heater.
Accordingly, the fume afterheat processing module also comprises thermal induction element, is used for detecting the temperature of said fume afterheat processing module steam, through the monitoring to vapor (steam) temperature, realizes the monitoring to the phase-change heat-exchanger wall surface temperature.In the practical application, can thermal induction element be arranged in the tubular heat exchanger shell side.Control module also is used for controlling according to the detected temperature of said thermal induction element the frequency of said condensate booster pump, is higher than acid dew point to guarantee the phase-change heat-exchanger wall surface temperature.
Concrete; When monitoring vapor (steam) temperature when being lower than (acid dew point+15 ℃), can reduce the frequency of condensate booster pump, promptly let the water yield that flows into the fume afterheat processing module reduce; To improve vapor (steam) temperature, guarantee that the phase-change heat-exchanger wall surface temperature is higher than the certain safe clearance of acid dew point.
Referring to shown in Figure 2, air preheater import air channel 31, blower export air channel 32, tubular heat exchanger 33, phase-change heat-exchanger 34, vapor uptake 35, liquid down-comer 36, flue gas 37.
When low-pressure heater is specially final stage low-pressure heater 7 and inferior final stage low-pressure heater 6; Condensate introduction pipe that links to each other with final stage low-pressure heater 7 inlet and condensate are sent back to and are respectively equipped with first on the pipeline and draw valve 11, first and send valve 12 back to, send back to and are respectively equipped with second on the pipeline and draw valve 21, second and send valve 22 back to the enter the mouth condensate introduction pipe that links to each other and condensate of inferior final stage low-pressure heater 6.
Control module is drawn valve, first and is sent valve, second back to and draw the break-make that valve and second is sent valve back to through controlling said first, realize to the condensate leading point with send control a little back to.
Between sending back to a little, the condensate leading point of condensate processing module and condensate connect a self circular loop; Said control module is arranged on the break-make of the self circular loop valve 3 on the said self circular loop through control, realizes the connection of said condensate processing module or the control of off-state;
The bypass loop that is connected in parallel, the two ends of said tubular heat exchanger, said control module is arranged on the break-make of the by-passing valve 2 on the said bypass circulation through control, realizes the connection of said fume afterheat processing module or the control of off-state.
When the phase-change heat-exchanger off-the-line (when the tubular heat exchanger bypass circulation is connected), the condensate booster pump switches to the power frequency operation mode, further to reach energy-conservation effect.
Certainly, also can be in the practical application so that the condensate booster pump still is operated under the variable mode, can artificially set it and be operated in maximum operation frequency (preferably) this moment, also can set it and be operated in other operating frequency, do not do qualification here.
In practical application, control module selects to connect or break off said fume afterheat processing module and said condensate processing module according to the work at present situation.
Here work at present situation can be that exhaust gas temperature is too high or too low, turbine back pressure is too high or normal condition or the like.In practical application, control module can be according to above-mentioned parameter being monitored and being reported to the police.
Under the different operating state, control module can be controlled the energy-optimised system that utilizes of the said station boiler of the utility model embodiment under the different working pattern, below introduces respectively:
Referring to Fig. 3; The work at present situation is specially exhaust gas temperature and is higher than first preset value; When summer, exhaust gas temperature was too high, be the protection tail gas treatment device, said control module control first is drawn valve, second and is sent the valve closure back to; Second draws valve, first sends valve, self circular loop valve, by-passing valve disconnection back to; Draw the preceding condensate of final stage low-pressure heater inlet, absorb the heat in the flue gas, behind combustion air heater heating combustion air, send the inlet of time final stage low-pressure heater again back to through the fume afterheat processing module.
That is to say; When the too high harm tail gas treatment device of exhaust gas temperature moves; After utilizing the lower condensate of the preceding temperature of final stage low-pressure heater inlet to absorb the heat combustion air in the flue gas; Return the inlet of time final stage low-pressure heater, farthest take away the heat in the flue gas, the normal operation of protection tail gas treatment device.
Be specially turbine back pressure referring to Fig. 4 work at present situation and be higher than second preset value; When summer, turbine back pressure was too high; Said control module control first is drawn valve, first and is sent valve, by-passing valve closure back to; Second draws valve, second sends valve, the disconnection of self circular loop valve back to, draws the preceding condensate of final stage low-pressure heater inlet, behind combustion air heater heating combustion air, sends the inlet of final stage low-pressure heater back to.
That is to say; When turbine back pressure is too high, can cause that steam turbine low pressure (LP) cylinder generating efficiency reduces, at this moment; With the higher condensate heating combustion air of temperature before the final stage low-pressure heater; The temperature of final stage low-pressure heater inlet condensate is minimized, and the cooling effect of final stage low-pressure heater gets a promotion, and the generating efficiency of steam turbine low pressure (LP) cylinder is improved.For the reduction of whole gas trap cooling effect in summer, though this method of operation is very limited to the effect that turbine efficiency promotes, but still a kind of regulating measure of can yet be regarded as.
Referring to Fig. 5; The work at present situation is specially exhaust gas temperature and is lower than the 3rd preset value; As winter exhaust gas temperature cross when low, said control module control second draws that valve, second is sent valve back to, by-passing valve is closed, first draws that valve, first is sent valve back to, the self circular loop valve breaks off; Draw time preceding condensate of final stage low-pressure heater inlet, behind combustion air heater heating combustion air, send the inlet of time final stage low-pressure heater back to.
That is to say; When the low excessively heat combustion air that causes flue gas to reclaim of exhaust gas temperature is not enough to substitute steam air heater; When perhaps reducing exhaust gas temperature again and can cause cold end corrosion to take place; With the higher condensate heating combustion air of temperature before time final stage low-pressure heater, and then alternative steam air heater bleeds, and steam air heater can be stopped transport.On the other hand; Because the reduction of time final stage low-pressure heater inlet condensing water temperature, the steam turbine rate of air sucked in required of inferior final stage low-pressure heater increases, and this method of operation consumes the inferior energy more; The high-quality energy that alternative steam air heater is bled and consumed also is a kind of power save mode.
Referring to Fig. 6; When the work at present situation is specially normal condition; Be that exhaust gas temperature is not higher than first preset value and is not less than the 3rd preset value and turbine back pressure when not being higher than second preset value; Said control module control self circular loop valve is closed; First draws valve, first sends valve, second back to and draws valve, second and send valve, by-passing valve back to and break off, and condensate absorbs the heat in the flue gas through the fume afterheat processing module, behind combustion air heater heating combustion air, sends into the fume afterheat processing module once more again and circulates.
That is to say; When duty be in normal condition be exhaust gas temperature be not too high or too low, when turbine back pressure is not too high; Comprise spring and autumn and most of the time summer in winter, can think a kind of normal condition, this moment, phase-change heat-exchanger absorbed the waste heat heating combustion air in the flue gas; Break off fully with condensate circuit, amount of energy saving is the heat that combustion air absorbs.This moment, steam air heater can not put into operation.
Need to prove; In this article; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make to comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program, described program can be stored in an embodied on computer readable and preserve in the medium.Described preservation medium, as: ROM/RAM, magnetic disc, CD etc.
More than the utility model has been carried out detailed introduction, this paper has used concrete example the principle and the embodiment of the utility model has been set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the utility model; Simultaneously, for persons skilled in the art, according to the thought of the utility model, part all can change on the specific embodiment and range of application.In sum, this description should not be construed as the restriction to the utility model.
Claims (9)
1. the energy-optimised system that utilizes of a station boiler is characterized in that, comprising:
The combustion air heater is used to heat combustion air;
The fume afterheat processing module is used for utilizing the heat condensate of flue gas;
The condensate processing module is used for drawing condensate according to the output of control module from the inlet of different low-pressure heaters, and after said combustion air heater output, sends said condensate of drawing the inlet of different low-pressure heaters back to;
Control module is used for controlling according to the work at present situation operation of said fume afterheat processing module and said condensate processing module;
The condensate booster pump is used under the control of said control module, with the condensate that the condensate and/or the said condensate processing module of said fume afterheat processing module output are drawn, imports said combustion air heater with the heating combustion air.
2. system according to claim 1 is characterized in that,
Said fume afterheat processing module specifically comprises: phase-change heat-exchanger and tubular heat exchanger, and said phase-change heat-exchanger is connected with said tubular heat exchanger with the liquid down-comer through vapor uptake;
Said condensate processing module specifically comprises: send pipeline back to condensate introduction pipe and condensate that the low-pressure heater inlet links to each other.
3. system according to claim 2 is characterized in that, said condensate booster pump is specially variable frequency pump; Said fume afterheat processing module also comprises thermal induction element, is used for detecting the temperature of said fume afterheat processing module steam;
Said control module also is used for, and controls the frequency of said condensate booster pump according to the detected temperature of said thermal induction element, is higher than acid dew point to guarantee said phase-change heat-exchanger wall surface temperature.
4. system according to claim 3 is characterized in that, said low-pressure heater comprises final stage low-pressure heater or inferior final stage low-pressure heater.
Condensate introduction pipe that links to each other with final stage low-pressure heater inlet and condensate are sent back to and are respectively equipped with first on the pipeline and draw valve, first and send valve back to, send back to and are respectively equipped with second on the pipeline and draw valve, second and send valve back to the enter the mouth condensate introduction pipe that links to each other and condensate of inferior final stage low-pressure heater;
Said control module is drawn valve, first and is sent valve, second back to and draw the break-make that valve and second is sent valve back to through controlling said first, realize to the condensate leading point with send control a little back to.
5. system according to claim 4; It is characterized in that; Between sending back to a little, the condensate leading point of said condensate processing module and condensate connect a self circular loop; Said control module is arranged on the break-make of the self circular loop valve on the said self circular loop through control, realizes the connection of said condensate processing module or the control of off-state;
The bypass loop that is connected in parallel, the two ends of said tubular heat exchanger, said control module is arranged on the break-make of the by-passing valve on the said bypass circulation through control, realizes the connection of said fume afterheat processing module or the control of off-state.
6. system according to claim 5; It is characterized in that the work at present situation is specially exhaust gas temperature when being higher than first preset value, said control module control first is drawn valve, second and is sent the valve closure back to; Second draws valve, first sends valve, self circular loop valve, by-passing valve disconnection back to; Draw the preceding condensate of final stage low-pressure heater inlet, absorb the heat in the flue gas, behind combustion air heater heating combustion air, send the inlet of time final stage low-pressure heater again back to through the fume afterheat processing module.
7. system according to claim 5; It is characterized in that; The work at present situation is specially turbine back pressure when being higher than second preset value, and said control module control first draws that valve, first is sent valve back to, by-passing valve is closed, and second draws that valve, second is sent valve back to, the self circular loop valve breaks off; Draw the preceding condensate of final stage low-pressure heater inlet, behind combustion air heater heating combustion air, send the inlet of final stage low-pressure heater back to.
8. system according to claim 5; It is characterized in that; The work at present situation is specially exhaust gas temperature when being lower than the 3rd preset value, and said control module control second draws that valve, second is sent valve back to, by-passing valve is closed, and first draws that valve, first is sent valve back to, the self circular loop valve breaks off; Draw time preceding condensate of final stage low-pressure heater inlet, behind combustion air heater heating combustion air, send the inlet of time final stage low-pressure heater back to.
9. system according to claim 5; It is characterized in that; The work at present situation is specially exhaust gas temperature and is not higher than first preset value and is not less than the 3rd preset value and turbine back pressure when not being higher than second preset value; Said control module control self circular loop valve is closed; First draws valve, first sends valve, second back to and draws valve, second and send valve, by-passing valve back to and break off, and condensate absorbs the heat in the flue gas through the fume afterheat processing module, behind combustion air heater heating combustion air, sends into the fume afterheat processing module once more again and circulates.
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| CN201120301100XU CN202195471U (en) | 2011-08-18 | 2011-08-18 | System for optimizing and using energy in station boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954460A (en) * | 2011-08-18 | 2013-03-06 | 彭科 | Power station boiler energy optimal utilization system |
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2011
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954460A (en) * | 2011-08-18 | 2013-03-06 | 彭科 | Power station boiler energy optimal utilization system |
| CN102954460B (en) * | 2011-08-18 | 2014-09-24 | 彭科 | Power station boiler energy optimal utilization system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120418 Effective date of abandoning: 20140924 |
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