CN203323529U - Energy-saving and emission-reducing system based on raw coal drying - Google Patents
Energy-saving and emission-reducing system based on raw coal drying Download PDFInfo
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- CN203323529U CN203323529U CN2013202883880U CN201320288388U CN203323529U CN 203323529 U CN203323529 U CN 203323529U CN 2013202883880 U CN2013202883880 U CN 2013202883880U CN 201320288388 U CN201320288388 U CN 201320288388U CN 203323529 U CN203323529 U CN 203323529U
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Abstract
The utility model discloses an energy-saving and emission-reducing system based on raw coal drying, wherein the energy-saving and emission-reducing system based on raw coal as drying takes raw coal as fired in a tail smoke waste heat drying boiler as a core. While drying of the raw coal as fired is finished, the smoke emission temperature is reduced. The energy-saving and emission-reducing system based on raw coal drying has the advantages of being small in investment, simple in structure, obvious in effect and stable in operation. The effects of energy-saving and efficiency-increasing and the effects of water-saving and efficiency-increasing are achieved, power consumption of a booster fan and an induced draft fan is reduced, and energy-saving and emission-reducing integrated comprehensive management is achieved.
Description
Technical field
The utility model belongs to the station boiler field, is specifically related to a kind of energy-saving and emission-reduction system of utilizing the dry boiler of tail flue gas waste heat to enter the stove raw coal.
Background technology
Average annual 30.5 hundred million tons of left and right of China's raw coal output in recent years, 15.6 hundred million tons, generating raw coal, the fire coal of take is that main thermal power output still accounts for more than 80% of whole generated energy.Generally contain the moisture of 15%-50% in coal, these moisture need to consume a large amount of energy in ignition process, make boiler combustion unstable; Can take away a large amount of heat energy while with flue gas, with gaseous form, entering atmosphere, reduce boiler efficiency; High-moisture raw coal brings very large burden to coal pulverizer, affects pulverizer capacity, makes fineness of pulverized coal not reach requirement, increases not loss fully of machinery, and easily causes Boiler Furnace slagging and corrosion.For thermal power plant, heat loss due to exhaust gas is one maximum in the boiler various heat losses, generally 5%～8%, account for the total heat loss of boiler 80% or higher, the principal element that affects heat loss due to exhaust gas is exhaust gas temperature, 10 ℃ of the every risings of exhaust gas temperature, heat loss due to exhaust gas increases by 0.6%～1.0%.Therefore reduce the boiler original moisture content of coal and exhaust gas temperature has obvious energy-saving and emission-reduction potentiality.
General power plant does not all have special former coal drying system or only replaces with indoor coal storage yard, does not play great effect; And the system investment that is specifically designed to drying brown coal is large, only for brown coal, and generally only be arranged near colliery, do not cover general power plant.The method that reduces exhaust gas temperature mainly contains transformation economizer, transformation air preheater, increases low-pressure coal saver etc.But owing to containing sour gas in low-temperature flue gas, dust stratification seriously corroded after dewfall, energy-saving effect is limited.
In sum, thermal power plant, aspect raw coal drying and reduction exhaust gas temperature, having a series of problem, is badly in need of the novel system that a kind of implementation result is remarkable, expense is low and comprehensively addresses the above problem.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned prior art problem, provide a kind of investment little, simple in structure, successful, stable, energy efficiency, water-saving and synergistic, reduce booster fan, air-introduced machine power consumption, realizes the energy-saving and emission-reduction system based on the raw coal drying that comprehensive regulation integrated energy-saving reduces discharging.
In order to achieve the above object, the technical scheme that the utility model adopts is: comprise the denitrating system be connected with boiler flue gas outlet, the denitration flue gas output of denitrating system is connected with the denitration flue gas input of air preheater, the preheating flue gas output of air preheater is connected with the flue gas input of electrostatic precipitator, the dedusting flue gas output of electrostatic precipitator is connected with the dedusting flue gas input of air-introduced machine and the dry flue gas input of raw coal hothouse respectively, described raw coal hothouse is connected with feeder and coal-grinding device respectively, the clammy ash-laden gas output of raw coal hothouse is connected with the clammy ash-laden gas input of cyclone separator, the feed back pipe of cyclone separator is connected with the feedback outlet of raw coal hothouse, the clammy flue gas input of weary gas blower fan is connected with the clammy flue gas output of cyclone separator, the clammy flue gas output of weary gas blower fan and the flue gas output of air-introduced machine are connected with the flue gas input of booster fan respectively, the supercharging flue gas output of booster fan is connected with the flue gas input of desulfurizing tower, and the desulfurization fume output of desulfurizing tower and the desulfurization fume input of chimney are connected.
The dry flue gas porch of described raw coal hothouse is provided with gas baffle, and clammy smoke outlet is provided with deflecting plate.
Be provided with the current-sharing piece in described raw coal hothouse.
The input of described weary gas blower fan is equipped with the temperature control system of controlling the air-introduced machine flow.
The utility model is sent the flue gas after dedusting into the raw coal hothouse raw coal is carried out to drying, have simple in structure, successful, stable characteristics, complete energy efficiency, water-saving and synergistic, reduce booster fan, air-introduced machine power consumption, realize the integrated energy-saving and emission-reduction of the comprehensive regulation.
The accompanying drawing explanation
Fig. 1 is system schematic of the present utility model;
Fig. 2 is the structure chart of the utility model raw coal hothouse 10.
Wherein, 1, boiler, 2, denitrating system, 3, air preheater, 4, electrostatic precipitator, 5, air-introduced machine, 6, booster fan, 7, desulfurizing tower, 8, chimney, 9, feeder, 10, raw coal hothouse, 11, cyclone separator, 12, coal pulverizer, 13, weary gas blower fan, 14, homogenizing plate, 15, gas baffle, 16, deflecting plate, 17, temperature control system, 18, the feed back pipe.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail.
As shown in Figure 1, the utility model comprises the denitrating system 2 be connected with boiler 1 exhanst gas outlet, the denitration flue gas output of denitrating system 2 is connected with the denitration flue gas input of air preheater 3, the preheating flue gas output of air preheater 3 is connected with the flue gas input of electrostatic precipitator 4, the dedusting flue gas output of electrostatic precipitator 4 is connected with the dedusting flue gas input of air-introduced machine 5 and the dry flue gas input of raw coal hothouse 10 respectively, the flue gas output of air-introduced machine 5 is connected with the flue gas input of booster fan 6, the supercharging flue gas output of booster fan 6 is connected with the flue gas input of desulfurizing tower 7, the desulfurization fume output of desulfurizing tower 7 is connected with the desulfurization fume input of chimney 8,
As shown in Figure 2, the dry flue gas porch of raw coal hothouse 10 is provided with gas baffle 15, be provided with current-sharing piece 14 in raw coal hothouse 10, the clammy ash-laden gas output of raw coal hothouse 10 is connected with the clammy ash-laden gas input of cyclone separator 11, and be provided with deflecting plate 16 at clammy smoke outlet, be connected with the feedback outlet of the raw coal hothouse 10 clammy flue gas input of weary gas blower fan 13 of the feed back pipe 18 of cyclone separator 11 is connected with the clammy flue gas output of cyclone separator 11, the input of weary gas blower fan 13 is equipped with the temperature control system 17 of controlling air-introduced machine 5 flows, the clammy flue gas output of weary gas blower fan 13 is connected with the flue gas input of booster fan 6, the moor coal input of raw coal hothouse 10 is connected with the moor coal output of feeder 9, and the dry raw coal output of raw coal hothouse 10 is connected with the dry raw coal input of coal pulverizer 12.
Operation principle of the present utility model is: the dedusting flue gas after electrostatic precipitator 4 is transported to the interior next dry raw coal of raw coal hothouse 10, not only can take full advantage of smoke discharging residual heat, improve boiler 1 heat utilization efficiency, reduce moisture in raw coal, improve the efficiency of exerting oneself, improve boiler 1 of coal pulverizer 12, and can prevent that the flying dust in flue gas mixes with the raw coal in raw coal hothouse 10 before electrostatic precipitator 4, increase the efficiency of the content of ashes of raw coal, the wearing and tearing that aggravate coal pulverizer 12 and reduction boiler 1; Oxygen content in flue gas is very low, can prevent the raw coal blast; Can contain some granule raw coal in dried clammy flue gas, through cyclone separator 11, the granule raw coal of separating is sent back in coal pulverizer again through feed back pipe 18, can save raw coal like this, reduce the dustiness in flue gas, reduce the wearing and tearing of weary gas blower fan and booster fan; Dry flue gas enters in raw coal hothouse 10 after gas baffle 15, and gas baffle 15 can make dry flue gas more disperse, and increases the degree of filling in its raw coal hothouse 10, increases flue gas flow, strengthens drying effect; Dried clammy ash-laden gas is realized initial gross separation after deflecting plate 16, and raw coal that can particle is larger is separated, and improves the whole separation effect of system; Raw coal is dispersed evenly after current-sharing piece 14, strengthened with flue gas between mix, increase drying effect; The entrance of dry flue gas is in raw coal hothouse 10 bottoms, and the entrance of moor coal, on raw coal hothouse 10 tops, carries out drying with this adverse current form, can improve drying efficiency; Must after temperature control system 17 measurements are qualified, weary gas blower fan 13 can entered through the clammy flue gas after cyclone separator 11 separates, keep herein flue-gas temperature more than 85 ℃, prevent that the water in flue gas from condensing, damage weary gas blower fan 13, if flue-gas temperature is too low, can increase exerting oneself of weary gas blower fan 13 by temperature control system 17, increase the dry flue gas flow, improve the temperature of dry rear clammy flue gas; The shunting of dry flue gas has reduced the exhaust gas volumn through air-introduced machine 5, can reduce the power consumption of air-introduced machine 5; The clammy flue gas of weary gas blower fan 13 outlets mixes with the flue gas of air-introduced machine 5 outlets, has reduced the flue-gas temperature of booster fan 6 entrances, reduces the booster fan power consumption, has also reduced the water yield of desulfurizing tower 7 porch spray desuperheatings simultaneously, has greatly saved precious water resource.It is little, simple in structure that such device totally has investment, successful, and stable characteristics, complete energy efficiency, water-saving and synergistic, reduces booster fan, air-introduced machine power consumption, realizes the integrated energy-saving and emission-reduction of the comprehensive regulation.
Claims (4)
1. the energy-saving and emission-reduction system based on the raw coal drying, it is characterized in that: comprise the denitrating system (2) be connected with boiler (1) exhanst gas outlet, the denitration flue gas output of denitrating system (2) is connected with the denitration flue gas input of air preheater (3), the preheating flue gas output of air preheater (3) is connected with the flue gas input of electrostatic precipitator (4), the dedusting flue gas output of electrostatic precipitator (4) is connected with the dedusting flue gas input of air-introduced machine (5) and the dry flue gas input of raw coal hothouse (10) respectively, described raw coal hothouse (10) is connected with feeder (9) and coal-grinding device (10) respectively, the clammy ash-laden gas output of raw coal hothouse (10) is connected with the clammy ash-laden gas input of cyclone separator (11), the feed back pipe (18) of cyclone separator (11) is connected with the feedback outlet of raw coal hothouse (10), the clammy flue gas input of weary gas blower fan (13) is connected with the clammy flue gas output of cyclone separator (11), the clammy flue gas output of weary gas blower fan (13) and the flue gas output of air-introduced machine (5) are connected with the flue gas input of booster fan (6) respectively, the supercharging flue gas output of booster fan (6) is connected with the flue gas input of desulfurizing tower (7), and the desulfurization fume output of desulfurizing tower (7) is connected with the desulfurization fume input of chimney (8).
2. the energy-saving and emission-reduction system based on the raw coal drying according to claim 1, it is characterized in that: the dry flue gas porch of described raw coal hothouse (10) is provided with gas baffle (15), and clammy smoke outlet is provided with deflecting plate (16).
3. the energy-saving and emission-reduction system based on the raw coal drying according to claim 1 and 2, is characterized in that: be provided with current-sharing piece (14) in described raw coal hothouse (10).
4. the energy-saving and emission-reduction system based on the raw coal drying according to claim 1 and 2 is characterized in that: the input of described weary gas blower fan (13) is equipped with the temperature control system (17) of controlling air-introduced machine 5 flows.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013202883880U CN203323529U (en) | 2013-05-23 | 2013-05-23 | Energy-saving and emission-reducing system based on raw coal drying |
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| CN2013202883880U CN203323529U (en) | 2013-05-23 | 2013-05-23 | Energy-saving and emission-reducing system based on raw coal drying |
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| CN203323529U true CN203323529U (en) | 2013-12-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705621A (en) * | 2016-12-30 | 2017-05-24 | 天津闪速炼铁技术有限公司 | Drying device for metallurgical raw materials and drying method applying drying device |
| CN107036432A (en) * | 2017-06-03 | 2017-08-11 | 中国电力工程顾问集团东北电力设计院有限公司 | Reclaim heat and extract raw coal drying system before the coal pulverizer of moisture in coal |
-
2013
- 2013-05-23 CN CN2013202883880U patent/CN203323529U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705621A (en) * | 2016-12-30 | 2017-05-24 | 天津闪速炼铁技术有限公司 | Drying device for metallurgical raw materials and drying method applying drying device |
| CN107036432A (en) * | 2017-06-03 | 2017-08-11 | 中国电力工程顾问集团东北电力设计院有限公司 | Reclaim heat and extract raw coal drying system before the coal pulverizer of moisture in coal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20150523 |
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| EXPY | Termination of patent right or utility model |