CN104566407A - Waste heat recovery device and dry slagging boiler comprising waste heat recovery device - Google Patents
Waste heat recovery device and dry slagging boiler comprising waste heat recovery device Download PDFInfo
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- CN104566407A CN104566407A CN201510020181.9A CN201510020181A CN104566407A CN 104566407 A CN104566407 A CN 104566407A CN 201510020181 A CN201510020181 A CN 201510020181A CN 104566407 A CN104566407 A CN 104566407A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 87
- 238000011084 recovery Methods 0.000 title claims abstract description 84
- 239000002893 slag Substances 0.000 claims abstract description 64
- 230000005855 radiation Effects 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 90
- 239000002956 ash Substances 0.000 claims description 38
- 230000008859 change Effects 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000010884 boiler slag Substances 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000009998 heat setting Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 14
- 230000001172 regenerating effect Effects 0.000 abstract 2
- 239000003570 air Substances 0.000 description 35
- 238000001816 cooling Methods 0.000 description 24
- 238000002485 combustion reaction Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 7
- 230000036961 partial effect Effects 0.000 description 7
- 239000010882 bottom ash Substances 0.000 description 5
- 238000010926 purge Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 208000011580 syndromic disease Diseases 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000006392 deoxygenation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The invention relates to a waste heat recovery device of a boiler, and particularly provides a waste heat recovery device for a dry slagging boiler. The waste heat recovery device replaces a transition slag hopper or well of the boiler, or is arranged in the transition slag hopper or well, and is used for absorbing radiation heat at the bottom of the boiler and heat of high-temperature ash slag in the boiler operation process, and the waste heat recovery device is connected with an outlet of a condensate pump of a steam turbine or an outlet of a first-level low-pressure regenerative heater, and transmits the absorbed heat to an inlet of a second-level low-pressure regenerative heater. The waste heat recovery device can further absorb the heat of the high-temperature ash slag and the radiation heat at the bottom of the boiler on the basis of a boiler dry slagging system, and therefore the thermal efficiency of the boiler is improved, and the adaptability of an existing air-cooled dry slagging system to coal quality and slagging quantity changes of the boiler is improved.
Description
The application is the divisional application that the name submitted on September 15th, 2010 is called the Chinese invention patent application 201010282917.7 of " waste-heat recovery device and comprise the dry slag-discharging boiler of this waste-heat recovery device ", and requires the applying date of enjoying this earlier application.
Technical field
The present invention relates to a kind of waste-heat recovery device of boiler, relate more specifically to a kind of waste-heat recovery device for coal-fired dried slag removing boiler.
Background technology
The thermal efficiency formula of coal-burning boiler is: η 2=100-∑ q=(q2+q3+q4+q5+q6), wherein: η 2 is boiler counter-balance thermal efficiency (%); Q2 is heat loss due to exhaust gas (%); Q3 is gas incomplete combustion heat loss (%); Q4 is heat loss of imperfect solid combustion (%); Q5 is radiation loss (%); Q6 is heat loss due to sensible heat in slag (%).The lime-ash that coal-burning boiler is discharged also has higher temperature, and the physical sensible heat entrained by it is called heat loss due to sensible heat in slag q6.The principal element affecting heat loss due to sensible heat in slag's size is the size of bed drain purge and the height of ash temperature.
To ash content higher than 30% medium and low heat value fuel, if lime-ash is without cooling, heat loss due to sensible heat in slag can reach more than 2%.On the other hand, process and the transport of red-hot lime-ash extremely bother, and be unfavorable for mechanized operation, the temperature upper limit that general lime-ash processing machine can bear is mostly below 150 DEG C, and it is necessary for therefore cooling lime-ash.
At present, the dry slag-discharging boiler of large-size thermal power plant generally adopts air-cooled dreg removing system.The operation principle of described air-cooled dreg removing system is as follows: the hot lime-ash that coal-burning boiler is discharged is fallen on the conveying steel belt of dry bottom ash air-cooling conveyor after transition slag bucket (or slag well), hydraulic shutoff door, and moves with the conveying steel belt of slowly movement; Two side and the head-tail of dry bottom ash air-cooling conveyor are equipped with air inlet, suck controlled a small amount of ambient, cool air under the effect of combustion chamber draft; Lime-ash containing imperfect combustion combustible contacts with the cold air sucked is reverse thus burns further in dropping process and on conveying steel belt, and carries out heat exchange with this cold air, thus is cooled to low temperature lime-ash; Cold air can be heated to 250 DEG C about-400 DEG C, and the temperature of hot lime-ash can drop to less than 200 DEG C by 600 DEG C-850 DEG C, even lower than 100 DEG C, to suck while cold air and also brings in stove by the heat recovery of lime-ash; Cooled dry slag, after one-level or two-stage fragmentation, is delivered to slag storage by machinery or pneumatic conveyer system and deposits.
Dry-type slag extractor utilizes boiler lost pressure cooling warm sludge, simultaneously by carry heat back boiler by natural wind.The heat of dry-type slag extractor band back boiler mainly comprises thermal loss q4, three parts such as the loss of the end slag physical thermal q6 and slag-drip opening radiation heat loss q5 etc. of unburned coal in end slag.Utilize cool ambient air to cool lime-ash, cooling air quantity is about 1.3% of specified total blast volume to the maximum, otherwise can cause adverse effect to the safe and stable operation of boiler.
From burning aspect, the impact of boiler thermal output is also depended on to cooling air quantity and the cooling air charging temperature of dry bottom ash air-cooling conveyor.When lime-ash cooling air caloric receptivity one timing, cooling air quantity is larger, and wind-warm syndrome is lower.When the hot blast temperature of cooling air temperature close to secondary blast, cooling air is sent into by from furnace bottom as the air needed for burning, when entering stove total combustion air amount and remaining unchanged, the corresponding minimizing of cold air amount through air preheater can be made from the excess air of furnace bottom feeding, thus cause the exhaust gas temperature of boiler to raise, and then reduce the thermal efficiency of boiler.
In order to ensure Combustion Operation of Boilers and boiler efficiency, the air quantity entering boiler furnace after dry bottom ash air-cooling conveyor cooling warm sludge is generally no more than boiler and always burns 1.3% of air quantity, and the wind-warm syndrome entering burner hearth is not less than 250 DEG C-400 DEG C; Consider that the deslagging temperature of slag extractor or slag cooler is generally no more than 200 DEG C on requirements such as the harm of operations staff, surrounding environment and the heatproof designs of impact and lime-ash subsequent delivery equipment.For the boiler of certain capacity, under the prerequisite not changing boiler combustion air distribution, the air quantity being entered burner hearth by boiler bottom is allowed to be certain.But, in actual motion, the coal source ature of coal of coal fired thermal power plant is more assorted, change greatly, the actual ature of coal used is off-design and check ature of coal often, boiler slag removal amount, ash discharge amount alters a great deal (these depend primarily on the situation of change of coal supply and coal market), the change of boiler slag removal amount is caused to be passive and wayward (being difficult to qualitative assessment in the design selection stage) thus, cause the cooling air quantity of dry bottom ash air-cooling conveyor and cooling wind-warm syndrome and disposal ability also to change thereupon, these all can have a negative impact to the stability of Combustion Operation of Boilers and the thermal efficiency, thus affect security reliability and the economy of unit operation.Such as, when the ature of coal of boiler combustion is deteriorated, the bed drain purge of boiler will be greater than initial bed drain purge of checking, thus results through the air quantity increase that burner hearth sent into by air-cooled dry-type slag discharging machine.As mentioned above, when entering stove total combustion air amount and remaining unchanged, this can make the corresponding minimizing of cold air amount through air preheater, thus causes the exhaust gas temperature of boiler to raise, and then reduces the thermal efficiency of boiler.
In addition, although the waste heat of high-temperature ash can be recycled by above-mentioned air-cooled dry dreg removing system while cooling down high-temperature lime-ash, but the change of this system to boiler ature of coal and bed drain purge is more responsive, and can not radiations heat energy well bottom absorption boiler.As can be seen here, still there is the space of improvement in the radiations heat energy of existing coal-fired dried slag removing boiler bottom absorption boiler and with dreg removing system related aspect.
Summary of the invention
In order to solve or at least improve the problems referred to above of the prior art, the invention provides a kind of waste-heat recovery device for dry slag-discharging boiler, this waste-heat recovery device can absorb the heat of high-temperature ash and the radiations heat energy of boiler bottom further on the basis of air-cooled dry dreg removing system, thus improves the thermal efficiency of boiler and economy and improve the adaptability of existing air-cooled dry dreg removing system to boiler ature of coal and bed drain purge change.
For this purpose, according to an aspect of the present invention, a kind of waste-heat recovery device for dry slag-discharging boiler is provided, described waste-heat recovery device is arranged on boiler bottom, for the heat of the radiations heat energy bottom absorption boiler in boiler running process and high-temperature ash, described waste-heat recovery device is arranged in the condensate water backheat heating pipeline of boiler in serial or parallel connection mode, thus the heat recovery of absorption is used for heat-setting water.
In preferred embodiment, described waste-heat recovery device comprises heat-exchange tube or heat exchanger plate, cold water inlet pipeline and hot-water outlet conduits, wherein said cold water inlet pipeline is connected with the arrival end of described heat-exchange tube or heat exchanger plate in the upstream of described heat-exchange tube or heat exchanger plate, for the condensate water from condensate water heated transfer line line is imported described heat-exchange tube or heat exchanger plate; Described heat-exchange tube or heat exchanger plate are for the radiations heat energy of condensed water absorption boiler bottom by flowing wherein and the heat of high-temperature ash; And described hot-water outlet conduits is connected with the port of export of institute's heat-exchange tube or heat exchanger plate in the downstream of described heat-exchange tube or heat exchanger plate, be back to condensate water heated transportation pipeline from described heat-exchange tube or heat exchanger plate for making the condensate water absorbing heat.
In preferred embodiment, described waste-heat recovery device replaces the slag bucket of existing coal-burning boiler or slag well and is arranged on boiler bottom and is connected with the slag notch of boiler slag bucket, and described waste-heat recovery device also comprises: support, it is for support described heat-exchange tube or heat exchanger plate around mode; Influent header, it is arranged on described heat-exchange tube or between heat exchanger plate and described cold water inlet pipeline; Outlet header, it is arranged on described heat-exchange tube or between heat exchanger plate and described hot-water outlet conduits, wherein said influent header and outlet header are the condensate water turnover house stewards of described heat-exchange tube or heat exchanger plate, for uniform distribution or the condensate water of assembling in described heat-exchange tube or heat exchanger plate.
In preferred embodiment, described waste-heat recovery device is arranged in the transition slag bucket (slag well) of existing coal-burning boiler, and on described heat-exchange tube or the heat exchanger plate housing that is circumferentially arranged on transition slag bucket (slag well) in the mode of vertical or horizontal layout or inwall.
In preferred embodiment, described waste-heat recovery device is connected to condensate pump or between first order low pressure bleeder heater and second level low pressure bleeder heater, the hot water of thus discharging from described hot-water outlet conduits is admitted to the low pressure bleeder heater of the second level and continues heating.
In preferred embodiment, described waste-heat recovery device and first order low pressure bleeder heater are arranged in parallel, and the hot water of thus discharging from described hot-water outlet conduits is admitted to the low pressure bleeder heater of the second level and continues heating.
In preferred embodiment, described waste-heat recovery device also comprises the flow regulator for regulating the water yield flowing through described heat-exchange tube or heat exchanger plate; Described flow regulator in response to boiler slag removal amount and deslagging temperature change and change the water yield flowing through described heat-exchange tube or heat exchanger plate, thus the ratio air quantity being entered boiler furnace by dry slag extractor being accounted for specified total blast volume controls in prescribed limit.
In preferred embodiment, the ratio that the air quantity being entered boiler furnace by dry slag extractor is accounted for specified total blast volume by described flow regulator controls as being less than or equal to 1.3%.
In preferred embodiment, the ratio that the air quantity being entered boiler furnace by dry slag extractor accounts for specified total blast volume controls in the scope of 0.3-0.5% by described flow regulator.
According to another aspect of the present invention, provide a kind of dry slag-discharging boiler, described dry slag-discharging boiler comprises the waste-heat recovery device according to any one of technique scheme.
By adopting technique scheme of the present invention, on the one hand can the partial heat of the effective high-temperature ash of absorption boiler, thus by being entered the Boiler pressure control of burner hearth by slag extractor in prescribed limit, reach the object of stable Combustion Operation of Boilers; On the other hand can radiation waste heat (i.e. unserviceable heat) fully bottom recovery boiler, and it is effectively utilized, thus raising boiler thermal output and economy, reach energy-saving and cost-reducing object.
Accompanying drawing explanation
Fig. 1 is the schematic partial cross-sectional view of the coal-burning boiler assembly being provided with waste-heat recovery device of the present invention, wherein for the sake of clarity, eliminates the known component of part of this coal-burning boiler.
Composition component in Fig. 1 and the corresponding relation of Reference numeral as follows:
1-boiler furnace center line; 2-waste-heat recovery device; 3-boiler water wall lower collecting box; 4-boiler water wall; Mechanical seal between 5-boiler water wall and waste-heat recovery device; The abrasionproof backplate of 6-mechanical seal; The outlet header of 7-waste-heat recovery device; The influent header of 8-waste-heat recovery device; The heat-exchange tube of 9-waste-heat recovery device or heat exchanger plate; The dry slag extractor center line of 10-; The support of 11-waste-heat recovery device; The hot-water outlet conduits of 12-waste-heat recovery device; The cold water inlet pipeline of 13-waste-heat recovery device.
Detailed description of the invention
First, in order to understand the present invention more fully, briefly introduce as follows at this to the condensate water backheat heating process flow process of coal-fired boiler in power plant: from the high pressure superheated steam of boiler after steam turbine does work (generating) discharged to condenser, after acting, low-pressure steam is condensed into condensate water in condenser, this condensate water is assembled in the bottom hot well of condenser, condensate water in hot well is boosted through condensate pump, condensate water after boosting heats through first order low pressure (or shaft seal) bleeder heater subsequently successively, second level low pressure bleeder heater and deoxygenation bleeder heater, condensate water after heating deoxygenation is boiler feedwater by boiler feed pump boosting, boiler feedwater is heated through multistage pressure bleeder heater, boiler feedwater after heating is admitted in boiler and proceeds combustion heating, the high pressure superheated steam produced is transported to steam turbine again, so move in circles.
Below in conjunction with accompanying drawing technical scheme of the present invention done and further describe in detail.It should be noted that, what this detailed description of the invention part provided is only the preferred embodiment of the present invention, and it is only exemplary in essence, and not intended to be is construed as limiting invention, its application, or uses.Those skilled in the art, it is easily understood that under the prerequisite not changing principle of the present invention, can make a change the details of this preferred embodiment, to adapt to specific environment or application scenario.
As shown in Figure 1, waste-heat recovery device entirety by reference number 2 of the present invention indicates.(namely waste-heat recovery device 2 is arranged on boiler bottom, transition slag bucket or the slag well location of existing coal-burning boiler are put), the upper end of waste-heat recovery device 2 is connected in the mode of mechanical seal 5 with the slag notch (specifically boiler water wall 4) of boiler water wall, and lower end slag-drip opening is connected with dry-type slag extractor (not shown).Waste-heat recovery device 2 comprises: support 11, and it is for the heat exchanger components supporting waste-heat recovery device 2 around mode (i.e. heat-exchange tube or heat exchanger plate 9); Heat-exchange tube or heat exchanger plate 9, it is arranged in series in above-mentioned condensate water heated transportation pipeline, and the partial heat for the high-temperature ash of the partial radiation heat of boiler bottom and boiler being discharged is transferred to the condensate water flow through wherein; Cold water inlet pipeline 13, it is connected with the influent header 8 of described waste-heat recovery device at described heat-exchange tube or the upstream of heat exchanger plate 9, for condensate water being assigned to equably described heat-exchange tube or heat exchanger plate 9, as shown in Figure 1, cold water inlet pipeline 13 passes from the sidewall of support 11; Hot-water outlet conduits 12, it is connected with the outlet header 7 of waste-heat recovery device at described heat-exchange tube or the downstream of heat exchanger plate 9, is back to equably described condensate water heated transportation pipeline from described heat-exchange tube or heat exchanger plate 9 for making the hot water absorbing boiler bottom radiations heat energy and lime-ash heat.In one embodiment, the outlet of cold water inlet pipeline 13 in upstream with condensate pump or first order low pressure bleeder heater (specifically gland heater) is connected, and the entrance of hot-water outlet conduits 12 in downstream with second level low pressure bleeder heater is connected, therefore waste-heat recovery device 2 is arranged in series between the outlet and the entrance of second level low pressure bleeder heater of condensate pump or first order low pressure bleeder heater (specifically gland heater).In addition, that waste-heat recovery device 2 is arranged in series in condensate water backheat heated transportation pipeline although described herein, those skilled in the art are it is easily understood that waste-heat recovery device of the present invention 2 obviously can be arranged in parallel in condensate water feed-line with first order low pressure bleeder heater (gland heater).Such as, when cold water inlet pipeline 13 is connected with condensate water delivery side of pump (entrance of first order low pressure bleeder heater) in upstream, and hot-water outlet conduits 12 downstream with or the outlet of first order low pressure bleeder heater is connected time, waste-heat recovery device 2 can be arranged in parallel with first order low pressure bleeder heater, thus makes to only have partial coagulation water to flow through this waste-heat recovery device 2.
It should be noted that, in the example embodiment shown in fig. 1, waste-heat recovery device 2 instead of slag bucket or the slag well of existing coal-burning boiler.That is, do not arrange conventional transition slag bucket or slag well in the boiler assembly shown in Fig. 1, waste-heat recovery device 2 both had function of recovering waste heat, also had the function of conventional transition slag bucket (slag well).Moreover, although do not illustrate in figure, waste-heat recovery device 2 also comprises the peripheral lagging facility or housing that arrange around heat-exchange tube or heat exchanger plate 9, it is similar with the shape of conventional transition slag bucket or slag well, and heat-exchange tube or heat exchanger plate 9 are fixedly connected on the inwall of this peripheral lagging facility or housing.
In a preferred embodiment, waste-heat recovery device 2 also comprises outlet header 7 and influent header 8, it is separately positioned on heat-exchange tube or heat exchanger plate 9 and between hot-water outlet conduits 12 and cold water inlet pipeline 13, for when having multiple heat-exchange tube or heat exchanger plate 9 as the house steward connecting described heat-exchange tube or heat exchanger plate 9 and hot-water outlet conduits 12 and cold water inlet pipeline 13.
Although shown in Fig. 1 and waste-heat recovery device described herein 2 instead of the transition slag bucket (slag well) of existing coal-burning boiler, and comprise heat-exchange tube or heat exchanger plate 9, support 11, cold water inlet pipeline 13, hot-water outlet conduits 12, outlet header 7 and influent header 8, but it should be noted that, when not changing principle of the present invention, this waste-heat recovery device 2 only can comprise heat-exchange tube or heat exchanger plate 9, cold water inlet pipeline 13 and hot-water outlet conduits 12, and described heat-exchange tube or heat exchanger plate 9 can be set on the inwall of conventional transition slag bucket or slag well in any suitable manner.In addition, also can omit peripheral housing, and/or heat-exchange tube or heat exchanger plate 9 can be replaced with other equivalent heat-exchanger rigs.Such as, heat-exchange tube or heat exchanger plate 9 can be circumferentially be arranged on single heat-exchange tube on the inwall of transition slag bucket (slag well) or above-mentioned peripheral housing or heat exchanger plate in the mode of vertical or horizontal coiling.
In boiler running process, most of heat of the high-temperature ash that the condensed water absorption of flowing in heat-exchange tube or heat exchanger plate 9 falls, reduce the cooling air quantity for cooling down high-temperature lime-ash in dry slag extractor, thus guarantee to be entered by dry slag extractor the air quantity of boiler furnace (described above, to be usually no more than 1.3% of specified total blast volume) in the safe range allowed when boiler slag removal quantitative change large (such as because ature of coal is deteriorated caused).In this regard, this waste-heat recovery device 2 also can comprise the flow regulator for regulating the water yield flowing through heat-exchange tube or heat exchanger plate 9.Such as, when waste-heat recovery device 2 and condensate water heated transfer line line parallel arranges and only have partial coagulation water flow through this waste-heat recovery device 2, the water yield that this flow regulator can be used for adjustment or is distributed through waste-heat recovery device 2 accounts for the percentage of total condensing capacity.This flow regulator can be Artificial Control or automatically control, so that in response to boiler slag removal amount and deslagging temperature change and change the water yield flowing through heat-exchange tube or heat exchanger plate 9, thus the air quantity being entered boiler furnace by dry slag extractor is stabilized to be less than or equal to 1.3% of specified total blast volume, be preferably the 0.3-0.5% of specified total blast volume.
On the other hand, because waste-heat recovery device 2 (more specifically heat-exchange tube or heat exchanger plate 9) is arranged on boiler bottom, therefore it can radiations heat energy effectively bottom absorption boiler, thus reaches the object of Waste Heat Reuse.More particularly, the condensate water that heat-exchange tube or heat exchanger plate 9 are crossed in the radiations heat energy of the boiler bottom absorbed and the heat convection current of high-temperature ash heats, and continued to be back in condensate water feed-line by the condensate water heated, thus decrease the used heat of boiler, waste heat loss correspondingly improve boiler thermal output and economy.In this regard, waste-heat recovery device 2 can be counted as the condensate water auxiliary low pressure heater by boiler used heat, waste heat work.
It should be noted that, only exemplary about heat-exchange tube or the quantity of heat exchanger plate 9 and the description of structure above, those skilled in the art it is easily understood that, under the prerequisite that can realize principle of the present invention (radiations heat energy namely bottom effective absorption boiler and the partial heat of high-temperature ash), described heat-exchange tube or heat exchanger plate 9 can be set to have any suitable quantity and structure.
Waste-heat recovery device 2 of the present invention is compact to design, mounting arrangements simple, and it utilizes heat-exchanger rig to cool the high-temperature ash that boiler is discharged; Carry out heat-setting water by absorption high-temperature ash physical sensible heat and boiler bottom slag-drip opening radiations heat energy in cooling procedure, thus reclaim radiation waste heat, high-temperature ash waste heat.
The air quantity entering boiler furnace because cooling warm sludge is laggard can be guaranteed in the scope of 0.3-0.5%, avoid because cooling air is to the lifting of combustion centre, the rising of decreased average exhaust gas temperature reaches about 3-5 DEG C, ensure that exhaust gas temperature is in prescribed limit, thus decrease boiler exhaust gas heat loss.
In addition, from the viewpoint of Energy-saving Data, the temperatures as high of a large amount of high-temperature ash produced in production process more than 850 DEG C, the specific heat capacity of lime-ash is about 0.959kJ/ (kg DEG C), if the mean temperature of lime-ash is in 850 DEG C, after recovery heat, the discharge temperature of lime-ash is by 200 DEG C, then the sensible heat of the recyclable 0.719GJ of lime-ash per ton, is about as much as the heat produced after 24.54kg standard coal burns completely.Calculate with the unit of 600MW, energy-conservation total amount will reach 1060 tons of standard coals.
Although only in conjunction with preferred embodiment, invention has been described above, scope of the present invention is not limited to concrete structure mentioned above and layout.Under the prerequisite of the principle of the present invention and design that do not depart from claims restriction, various change or adjustment can be made to the detail of described preferred embodiment, namely increase, delete and combination etc., these change or embodiment after adjustment also will fall within the scope of the present invention.
Claims (10)
1. the waste-heat recovery device for dry slag-discharging boiler, it is characterized in that, described waste-heat recovery device is arranged on boiler bottom, for the heat of the radiations heat energy bottom absorption boiler in boiler running process and high-temperature ash, described waste-heat recovery device is arranged in the condensate water backheat heating pipeline of boiler in serial or parallel connection mode, thus the heat recovery of absorption is used for heat-setting water.
2. waste-heat recovery device as claimed in claim 1, it is characterized in that, described waste-heat recovery device comprises heat-exchange tube or heat exchanger plate, cold water inlet pipeline and hot-water outlet conduits,
Wherein said cold water inlet pipeline is connected with the arrival end of described heat-exchange tube or heat exchanger plate in the upstream of described heat-exchange tube or heat exchanger plate, for the condensate water from condensate water heated transfer line line is imported described heat-exchange tube or heat exchanger plate; Described heat-exchange tube or heat exchanger plate are for the radiations heat energy of condensed water absorption boiler bottom by flowing wherein and the heat of high-temperature ash; And described hot-water outlet conduits is connected with the port of export of institute's heat-exchange tube or heat exchanger plate in the downstream of described heat-exchange tube or heat exchanger plate, be back to condensate water heated transportation pipeline from described heat-exchange tube or heat exchanger plate for making the condensate water absorbing heat.
3. waste-heat recovery device as claimed in claim 2, it is characterized in that, described waste-heat recovery device replaces the transition slag bucket of existing coal-burning boiler or slag well and is arranged on boiler bottom and is connected with the slag notch of boiler slag bucket, and described waste-heat recovery device also comprises:
Support, it is for support described heat-exchange tube or heat exchanger plate around mode;
Influent header, it is arranged on described heat-exchange tube or between heat exchanger plate and described cold water inlet pipeline;
Outlet header, it is arranged on described heat-exchange tube or between heat exchanger plate and described hot-water outlet conduits,
Wherein said influent header and outlet header are the condensate water turnover house stewards of described heat-exchange tube or heat exchanger plate, for uniform distribution or the condensate water of assembling in described heat-exchange tube or heat exchanger plate.
4. waste-heat recovery device as claimed in claim 2, it is characterized in that, in the transition slag bucket that described waste-heat recovery device is arranged on existing coal-burning boiler or slag well, and on described heat-exchange tube or the heat exchanger plate housing that is circumferentially arranged on transition slag bucket or slag well in the mode of vertical or horizontal layout or inwall.
5. the waste-heat recovery device according to any one of Claims 1-4, it is characterized in that, described waste-heat recovery device is connected to condensate pump or between first order low pressure bleeder heater and second level low pressure bleeder heater, the hot water of thus discharging from described hot-water outlet conduits is admitted to the low pressure bleeder heater of the second level and continues heating.
6. the waste-heat recovery device according to any one of Claims 1-4, it is characterized in that, described waste-heat recovery device and first order low pressure bleeder heater are arranged in parallel, and the hot water of thus discharging from described hot-water outlet conduits is admitted to the low pressure bleeder heater of the second level and continues heating.
7. the waste-heat recovery device according to any one of Claims 1-4, is characterized in that, described waste-heat recovery device also comprises the flow regulator for regulating the water yield flowing through described heat-exchange tube or heat exchanger plate; Described flow regulator in response to boiler slag removal amount and deslagging temperature change and change the water yield flowing through described heat-exchange tube or heat exchanger plate, thus the ratio air quantity being entered boiler furnace by dry slag extractor being accounted for specified total blast volume controls in prescribed limit.
8. waste-heat recovery device as claimed in claim 7, is characterized in that, the ratio that the air quantity being entered boiler furnace by dry slag extractor is accounted for specified total blast volume by described flow regulator controls as being less than or equal to 1.3%.
9. waste-heat recovery device as claimed in claim 8, it is characterized in that, the ratio that the air quantity being entered boiler furnace by dry slag extractor accounts for specified total blast volume controls in the scope of 0.3-0.5% by described flow regulator.
10. a dry slag-discharging boiler, is characterized in that, described dry slag-discharging boiler comprises waste-heat recovery device as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510020181.9A CN104566407A (en) | 2010-09-15 | 2010-09-15 | Waste heat recovery device and dry slagging boiler comprising waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510020181.9A CN104566407A (en) | 2010-09-15 | 2010-09-15 | Waste heat recovery device and dry slagging boiler comprising waste heat recovery device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010282917 Division CN101915426A (en) | 2010-09-15 | 2010-09-15 | Waste heat recovery device and dry slag discharging boiler comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104566407A true CN104566407A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510020181.9A Pending CN104566407A (en) | 2010-09-15 | 2010-09-15 | Waste heat recovery device and dry slagging boiler comprising waste heat recovery device |
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| CN (1) | CN104566407A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110763064A (en) * | 2019-10-30 | 2020-02-07 | 合肥化机装备制造有限公司 | Environment-friendly boiler pressure vessel waste heat recovery device and working method thereof |
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| CN110763064A (en) * | 2019-10-30 | 2020-02-07 | 合肥化机装备制造有限公司 | Environment-friendly boiler pressure vessel waste heat recovery device and working method thereof |
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