CN1480685A - Milling, waste steam heating equipment in thermal power stations - Google Patents
Milling, waste steam heating equipment in thermal power stations Download PDFInfo
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- CN1480685A CN1480685A CNA021328420A CN02132842A CN1480685A CN 1480685 A CN1480685 A CN 1480685A CN A021328420 A CNA021328420 A CN A021328420A CN 02132842 A CN02132842 A CN 02132842A CN 1480685 A CN1480685 A CN 1480685A
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Abstract
A deal-steam heater for preparing coal powder in steam-power plant features that in the wind box of powder exhauster, the screen-type heat exchanger for low-temp segment, the surface-type heat exchanger for middle-temp segment and the surface-type heat exchanger for high-temp segment are sequentially installed from bottom to top. Three heat exchangers can have the separated casings or a common casing. Each heat exchanger has condensed water control valve, air valve and moisture trap. The inlet of each heat exchanger is connected to relative steam sucking pipe of steam turbine.
Description
The present invention relates to a kind of milling, waste steam heating equipment in thermal power stations, belong to power engineering boiler specialty.
Storage formula transporting pulverized coal with exhaust gas boiler in the existing thermal power plant, temperature was lower when its system milling waste steam was gone into stove, greatly about 50～60 ℃, because temperature is lower, after going into stove, the inner flue gas of the stove temperature is descended, make boiler duty reduce, especially in a large number use hot blast to grind coal dust, high temperature section preheater load is increased, make to descend into the stove hot blast temperature, and on the other hand, a part of steam loses from water tower again in vain in the steam turbine, influences machine stove thermal efficiency of cycle.
The present invention is directed to the problems referred to above, a kind of milling, waste steam heating equipment in thermal power stations is provided, it can improve system milling waste steam charging temperature, reduces the boiler fired coal amount, can reduce the water tower cold source energy again, effectively improves machine stove thermal efficiency of cycle.
Task of the present invention is finished as follows: store up in thermal power plant in the mill exhauster bellows of formula transporting pulverized coal with exhaust gas boiler, low-temperature zone screen formula heat exchanger is installed from bottom to top successively, the middle-temperature section surface-type heat exchanger, the high temperature section surface exchanger, above-mentioned each section heat exchanger can be with connecting with ring flange after the shell segment encapsulation, also its all heat exchangers all can be installed in the shell, the steam of different pressures separates with dividing plate, be respectively fitted with the condensing capacity by-pass valve control on every section heat exchanger, air door, steam trap, and the corresponding extraction opening pipeline with steam turbine of the inlet of every section heat exchanger links; The present invention is equally applicable to pulverized coal carried by hot air formula boiler and direct blow boiler; As with a kind of design, the heat exchanger described in the present invention also can be installed in into the outlet of stove cold smoke blower fan, constitutes and goes into stove cold smoke heater.
The present invention adopts countercurrent flow, utilize extracted steam from turbine, heat making confused weary gas step by step by heat exchanger, make its temperature be elevated to 180～250 ℃ from 50～60 ℃, reduce the heat of going to the water tower cold source energy, after the weary aspiration receipts of powder process, be brought in the stove heavily again, can reduce the boiler fired coal amount, correspondingly also reduced and sent suction air volume, also just alleviated the boiler heating surface wearing and tearing, a system milling waste steam part that is heated enters coal pulverizer by the recirculation airduct, and the heat of coal pulverizer is heightened, so can change hot blast powder process is based on warm wind powder process, a small amount of warm wind flouring technology of mending hot blast, can reduce hot blast the coal pulverizer inlet is mixed the irreversible loss of wind-warm syndrome, and after the weary gas lift temperature of powder process, can make the ignition point reach of a wind snout place of boiler, can increase the anti-extinguishing ability of boiler between the low-load period at night, reduce boiler coal consumption, oil consumption when power consumption and boiler cold-state start helps energy-conservationly, reduces NO in smoke evacuation volume and the flue gas
xTotal amount of compound helps environmental protection.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Fig. 1 is overall structure figure of the present invention
Fig. 2 is the weary device of air figure of original powder process
Fig. 3 is as same design, goes into stove cold smoke blower fan heating plan
Fig. 4 is original stove cold smoke blower fan apparatus figure of going into
Fig. 5 the present invention with go into stove cold smoke heater present position figure in the wind powder system
With reference to 1,2, the present invention is take the former pulverized coal preparation system of thermal power plant as the basis, do not change mill exhauster [1], Recirculation airduct [2], an airduct [3], machine supplying powder and lower tube cell [4], Pulverized Coal Bin [5] overall structure , just in the bellows of mill exhauster [1], install successively from bottom to top low-temperature zone screen formula heat exchanger [6], Middle-temperature section surface-type heat exchanger [7], high temperature section surface exchanger [8] are outside above-mentioned each section heat exchanger can be used Connect with ring flange [9] after the shell segment encapsulation, also its all heat exchangers all can be installed in a shell In, the steam of different pressures separates with dividing plate, is respectively fitted with the condensing capacity control valve on every section heat exchanger Door [10], air door [11], steam trap [12], and the entrance of every section heat exchanger [13] and steamer The corresponding extraction opening pipeline of machine links; The present invention is equally applicable to pulverized coal carried by hot air formula boiler and direct-firing Boiler; With reference to accompanying drawing 3,4, as the same design, the heat exchanger described in the present invention equally can Be installed in into stove cold smoke fan outlet, formation enters stove cold smoke heater, with reference to accompanying drawing 5, in order to retouch State conveniently, here the present invention is replaced with A, enter stove cold smoke heater and replace with B.
The present invention passes in the low-temperature zone screen formula heat exchanger [6] with 0.1MPa steam earlier, and milling waste steam processed is added Heat passes in the middle-temperature section surface-type heat exchanger [7], with weary gas with 1MPa steam after 70～80 ℃ again Be heated to 150～200 ℃, pass in the high-temperature section heat exchanger [8] powder process with 2-4MPa steam more at last After weary gas is heated to 220～250 ℃, send into burner hearth as a wind, the condensed water available pump that produces Be sent to respectively drain tank or oxygen-eliminating device.
The screen formula heat exchanger that low-temperature zone of the present invention adopted, feed steam in its pipe, circulation system milling waste steam between screen, and the surface-type heat exchanger that the medium and high temperature section is adopted, circulation is made milling waste steam or is gone into the stove cold smoke in the pipe, the outer circulation of pipe steam, and heat exchanger answers body seal tight, guarantee that must not sew string between steam and flue gas and system milling waste steam mixes, various media also must not be leaked in the air.
Because contain 10～15% coal dust in the system milling waste steam, therefore, the inlet of surface-type heat exchanger must be provided with the abrasionproof section, the outside of abrasionproof section must not have steam or air to get involved, and sews phenomenon in order to avoid can produce after the wearing and tearing of abrasionproof section.
Because when the system milling waste steam being heated with 2-4MPa steam, the compressive resistance of heat exchanging device has higher requirements, consider from heat exchanger manufacturing cost and processing technology, it is also good to use 0.1MPa and 1MPa steam that milling waste steam is heated to 150～200 ℃ of effects, if 2-4MPa steam is used in decision, one dividing plate is set in the middle of preferably the two-stage surface-type heat exchanger being together in series, two section surface heat exchangers share one section abrasionproof section, gained 0.1MPa condensate water uses pumping toward drain tank, 1MPa condensate water pump direct sending oxygen-eliminating device, but 2-4MPa condensate water direct sending oxygen-eliminating device.
Because the system milling waste steam is heated to higher temperature, a wind volumetric expansion will cause wind speed too high, thereby must increase and recycle the airduct diameter and reduce the wind blast one time.
Because the inner mounting heat exchanger of mill exhauster bellows causes the bellows height to raise, so mill exhauster basis absolute altitude must be reduced, and Pulverized Coal Bin bottom starch bucket is sliced off a part, so that vacate the height mounting heat exchanger.
Owing to contain a large amount of water vapours and coal dust in the system milling waste steam, can stick on the heat exchanger surface after mixing, low-temperature zone of the present invention adopts screen formula heat exchanger, coal dust sticks on the heat exchanger outer surface, and power plant can install rapping apparatus, compressed air blowing cleaner or mechanical curettage device according to actual conditions and clear up.
Because the system milling waste steam coefficient of heat transfer is lower, therefore heat exchanger volume is bigger, cause the thickness of outer cover of heat exchanger steel plate to increase, the air quantity that powder process can be recycled in the airduct is drawn from mill exhauster outlet bellows, and a heat exchanger is installed separately, the weary gas heat exchanger of powder process is divided into two, and each heat exchanger volume all reduces, and its outer casing thickness also reduces thereupon.
Claims (3)
1, a kind of milling, waste steam heating equipment in thermal power stations, it is by mill exhauster [1], recirculation airduct [2], an airduct [3], machine supplying powder reaches tube cell [4] down, Pulverized Coal Bin [5] constitutes, it is characterized in that: in the bellows of mill exhauster [1], low-temperature zone screen formula heat exchanger [6] is installed from bottom to top successively, middle-temperature section surface-type heat exchanger [7], high temperature section surface exchanger [8], above-mentioned each section heat exchanger can be with connecting with ring flange [9] after the shell segment encapsulation, also its all heat exchangers all can be installed in the shell, the steam of different pressures separates with dividing plate, be respectively fitted with condensing capacity by-pass valve control [10] on every section heat exchanger, air door [11], steam trap [12], and the corresponding extraction opening pipeline with steam turbine of the inlet of every section heat exchanger [13] links.
2, milling, waste steam heating equipment in thermal power stations according to claim 1 is equally applicable to pulverized coal carried by hot air formula boiler and direct blow boiler.
3, milling, waste steam heating equipment in thermal power stations as claimed in claim 1, as with a kind of design, the heat exchanger described in the present invention can be installed in equally into the outlet of stove cold smoke blower fan, constitutes and goes into stove cold smoke heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021328420A CN1480685A (en) | 2002-09-02 | 2002-09-02 | Milling, waste steam heating equipment in thermal power stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021328420A CN1480685A (en) | 2002-09-02 | 2002-09-02 | Milling, waste steam heating equipment in thermal power stations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1480685A true CN1480685A (en) | 2004-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021328420A Pending CN1480685A (en) | 2002-09-02 | 2002-09-02 | Milling, waste steam heating equipment in thermal power stations |
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| CN (1) | CN1480685A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596980B (en) * | 2009-06-24 | 2012-06-06 | 哈尔滨工业大学 | Exhaust gas and hot air mixer suitable for hot air and exhaust gas double-medium powder delivery method |
-
2002
- 2002-09-02 CN CNA021328420A patent/CN1480685A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596980B (en) * | 2009-06-24 | 2012-06-06 | 哈尔滨工业大学 | Exhaust gas and hot air mixer suitable for hot air and exhaust gas double-medium powder delivery method |
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