CN203848313U - Positive pressure powder manufacturing system for drying brown coal through boiler interior heating primary air and cold smoke - Google Patents
Positive pressure powder manufacturing system for drying brown coal through boiler interior heating primary air and cold smoke Download PDFInfo
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- CN203848313U CN203848313U CN201420296747.1U CN201420296747U CN203848313U CN 203848313 U CN203848313 U CN 203848313U CN 201420296747 U CN201420296747 U CN 201420296747U CN 203848313 U CN203848313 U CN 203848313U
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- 239000000779 smoke Substances 0.000 title claims abstract description 46
- 239000003077 lignite Substances 0.000 title claims abstract description 26
- 238000001035 drying Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 title abstract description 6
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 239000000843 powder Substances 0.000 title abstract 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 30
- 239000003546 flue gas Substances 0.000 claims description 30
- 239000008246 gaseous mixture Substances 0.000 claims description 7
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 38
- 238000000227 grinding Methods 0.000 abstract description 3
- 239000002274 desiccant Substances 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 19
- 239000002802 bituminous coal Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a positive pressure powder manufacturing system which adopts a boiler interior heating primary air and cold smoke mode to increase the primary temperature of a drying agent needed by a medium-speed coal mill, so that the drying output of the medium-speed coal mill is increased. A rear smoke channel of a boiler is communicated with a chimney through an air preheater, an electric dust remover and a boiler induced-draft fan. A primary fan is communicated with the air preheater. One end of a hot air pipeline is communicated with the air preheater, and the other end of the hot air pipeline is communicated with a primary air inlet of the medium-speed coal mill. The inlet end of a cold smoke pipeline is communicated with the boiler induced-draft fan, and the outlet end of the cold smoke pipeline is communicated with a cold smoke fan. The outlet end of the cold smoke fan is communicated with one end of a smoke and air mixing pipeline, and the other end of the smoke and air mixing pipeline is communicated with the hot air pipeline through a boiler interior heater arranged on the lower portion in a boiler. One end of a cold primary air branch pipeline is communicated with the hot air pipeline, and the other end of the cold primary air branch pipeline is communicated with the smoke and air mixing pipeline. The system is applied to the medium-speed coal mill for manufacturing and grinding high-moisture brown coal.
Description
Technical field
The utility model relates to a kind of pulverized coal preparation system, is specifically related to add in a kind of stove heat primary air and cold smoke drying brown coal positive pressure powder-making system.
Background technology
Brown coal have the feature of fugitive constituent high (dry ash free basis fugitive constituent Vdaf > 37%), moisture high (total moisture is approximately more than 30%), caloric value lower (Qar, net=11000～15000kJ/kg).Brown coal due to oxygen content high (Oar=8%～12%), volatile content is high and easy spontaneous combustion.The feature of brown coal has determined that its pulverized coal preparation system has certain particularity.
Coal pulverizer is in power station boiler pulverizing system, crucial raw coal drying equipment.Widely the coal pulverizer of application mainly contains low speed coal mill, medium-speed pulverizer and blower mill three major types at present.Coal pulverizer type selecting is main relevant with former moisture content of coal, grindability and abrasiveness.Because of most of brown coal moisture is higher and abrasiveness a little less than, therefore in current combustion brown coal unit the stronger blower mill unit pulverized-coal system of extensive use drying capacity.According to the difference of drying medium, direct feed pulverized coal-fan mill pulverized coal preparation system also can be divided into second medium (hot blast and hot cigarette) and three media (hot blast, hot cigarette and cold smoke) drying system.And low speed coal mill, medium-speed pulverizer pulverized coal preparation system are mainly used in grinding bituminous coal, meager coal and anthracite.
Compare with bituminous coal, anthracite, the advantage of brown coal is that price is lower, use in addition the power plant of bituminous coal often due to raw coal supply problem, need bituminous coal fired boiler to mix burning brown coal or all use brown coal, bituminous coal fired boiler generally all adopts medium-speed pulverizer pulverized coal preparation system to grind bituminous coal, and brown coal water content is larger, and volatile matter height is inflammable and explosive, and medium-speed pulverizer pulverized coal preparation system is not suitable for grinding high-moisture brown coal.This just requires the former pulverized coal preparation system of bituminous coal fired boiler to transform, otherwise cannot guarantee equipment, the safety of the person and the economical operation of boiler.
Medium-speed pulverizer pulverized coal preparation system, owing to adopting from 300～350 ℃ of heat primary airs of boiler air preheater the drier as mill coal pulverizer system, because temperature is low, cannot meet medium-speed pulverizer pulverized coal preparation system and grind the calorific requirement requirement of brown coal institute.Because medium-speed pulverizer pulverized coal preparation system belongs to positive pressure powder-making system, if from boiler extracting high-temperature stove cigarette, must use high-temperature flue gas blower fan, high-temperature flue gas blower fan must can be 500 ℃ of left and right, the HTHP of 12KPa left and right, operation steady in a long-term under the large adverse circumstances of dustiness, prior art is difficult to realize, and there is no at present this type of sizing high-temperature flue gas blower fan.
Utility model content
The purpose of this utility model is that air temperature of existing medium-speed pulverizer pulverized coal preparation system is low in order to solve, positive pressure powder-making system is used that high-temperature flue gas blower fan difficulty is large, problem that cannot long-term safety stable operation, and provide, adds heat primary air and cold smoke drying brown coal positive pressure powder-making system in a kind of stove.
In the utility model stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system comprises boiler, electric cleaner, boiler induced-draft fan, chimney, cold smoke pipeline, cold smoke blower fan, flue gas air mixed pipe line, a cold wind bye-pass, stove internal heater, primary air fan, air preheater, hot-blast pipe line, medium-speed pulverizer and a cold wind main line, one end of electric cleaner is communicated with the back-end ductwork of boiler by air preheater, the other end of electric cleaner is communicated with the entrance point of boiler induced-draft fan, the port of export of boiler induced-draft fan is communicated with chimney, primary air fan is communicated with air preheater by a cold wind main line, one end of hot-blast pipe line is communicated with air preheater, the other end of hot-blast pipe line is communicated with a wind entrance of medium-speed pulverizer, the entrance point of cold smoke pipeline is communicated with the port of export of boiler induced-draft fan, the port of export of cold smoke pipeline is communicated with cold smoke blower fan, the port of export of cold smoke blower fan is communicated with one end of flue gas air mixed pipe line, the other end of flue gas air mixed pipe line is communicated with hot-blast pipe line by stove internal heater, stove internal heater is arranged on the bottom in boiler, one end of a cold wind bye-pass is communicated with hot-blast pipe line, the other end of a cold wind bye-pass is communicated with flue gas air mixed pipe line.
The utility model compared with prior art has following beneficial effect:
One, the flue gas that the pressure head that the utility model utilizes primary air fan 14 and cold smoke blower fan 6 mixes a cold wind and cold flue gas is sent into stove internal heater 10 degree of depth heating that are arranged in thorax, then mixes and together enter medium-speed pulverizer 18 with former stove heat primary air air.System does not need the supercharging of high-temperature flue gas blower fan, but adopts the supercharging of cold smoke blower fan, then enters the stove inner heating device heating under hot environment, finally sends into medium-speed pulverizer 18.Drier is inert media flue gas, and medium-speed pulverizer 18 internal desiccants are hot blast and cold smoke mixture, guarantees that pulverized coal preparation system terminal oxygen content is lower than 12%, and pulverized coal preparation system can effectively prevent coal dust detonation thus, and security is good.Eliminated the potential safety hazard of high-temperature flue gas blower fan, it can steady in a long-term be moved.
Two, the utility model adopts and in stove, to add heat primary air and cold smoke mode improves the required drier initial temperature of medium-speed pulverizer 18, thereby improves the drying capacity of medium-speed pulverizer.
Three, the utility model simple in structure, do not need to install additional hot cigarette blower fan, safety anti-explosive, be applicable to bituminous coal fired boiler medium-speed pulverizer unit pulverized-coal system and use brown coal transformation.Do not change the structure of former coal pulverizer and pulverized coal preparation system, improve former pulverized coal preparation system drying medium temperature, thereby improve the drying capacity of medium-speed pulverizer.The cold wind of part mixes with low-temperature furnace smoke with first, then enters stove internal heater, utilizes heat heating in boiler furnace, then mixes as drier with former stove heat primary air air, together enters coal pulverizer, improves the drying capacity of medium-speed pulverizer.Meanwhile, stove cigarette to reduce the oxygen content of pulverized coal preparation system, improves its security as the inert gas of pulverized coal preparation system.
Four, because brown coal moisture is large, conventionally the method adopting is the predrying equipment of setting up in former pulverized coal preparation system, and the utility model is not set up predrying equipment, by extracting hot and cold stove cigarette, add coal pulverizer to improve drying medium temperature methods, improve drying capacity of pulverizer and guarantee pulverized coal preparation system safety.
Accompanying drawing explanation
Fig. 1 is overall structure front view of the present utility model.
The specific embodiment
The specific embodiment one: present embodiment is described in conjunction with Fig. 1, present embodiment comprises boiler 1, electric cleaner 2, boiler induced-draft fan 3, chimney 4, cold smoke pipeline 5, cold smoke blower fan 6, flue gas air mixed pipe line 7, a cold wind bye-pass 8, stove internal heater 10, primary air fan 14, air preheater 15, hot-blast pipe line 16, medium-speed pulverizer 18 and a cold wind main line 19, one end of electric cleaner 2 is communicated with the back-end ductwork of boiler 1 by air preheater 15, the other end of electric cleaner 2 is communicated with the entrance point of boiler induced-draft fan 3, the port of export of boiler induced-draft fan 3 is communicated with chimney 4, primary air fan 14 is communicated with air preheater 15 by a cold wind main line 19, one end of hot-blast pipe line 16 is communicated with air preheater 15, the other end of hot-blast pipe line 16 is communicated with a wind entrance of medium-speed pulverizer 18, the entrance point of cold smoke pipeline 5 is communicated with the port of export of boiler induced-draft fan 3, the port of export of cold smoke pipeline 5 is communicated with cold smoke blower fan 6, the port of export of cold smoke blower fan 6 is communicated with one end of flue gas air mixed pipe line 7, the other end of flue gas air mixed pipe line 7 is communicated with hot-blast pipe line 16 by stove internal heater 10, stove internal heater 10 is arranged on the bottom in boiler 1, absorption boiler 1 hearth combustion region heat adds heat primary air and cold smoke, one end of a cold wind bye-pass 8 is communicated with hot-blast pipe line 16, the other end of a cold wind bye-pass 8 is communicated with flue gas air mixed pipe line 7.For ease of the slag that falls, along burner hearth, be arranged vertically, stove internal heater 10 is arranged on the top of boiler furnace inner burner below, furnace hopper, is connected and fixed with boiler surrounding water-cooling wall.Temperature range in stove internal heater 10 is 450 ℃～500 ℃, and the circulation area in stove internal heater 10 is according to the concrete calculative determination of the required hot blast rate of required every boiler.。
The specific embodiment two: in conjunction with Fig. 1, present embodiment is described, the stove internal heater 10 of present embodiment adopts heat resisting cast steel to make.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: in conjunction with Fig. 1, present embodiment is described, present embodiment is different from the specific embodiment three is that it also increases and has a cold wind control valve 9, and a cold wind control valve 9 is arranged on a cold wind bye-pass 8.Utilize a cold wind control valve 9 to regulate the air quantity of a cold wind.Other composition and annexation are identical with the specific embodiment two.
The specific embodiment four: in conjunction with Fig. 1, present embodiment is described, present embodiment is different from the specific embodiment four is that it also increases and has thermometer 11, and thermometer 11 is arranged on flue gas air mixed pipe line 7.Utilize thermometer 11 to measure the temperature of gaseous mixture.Other composition and annexation are identical with the specific embodiment three.
The specific embodiment five: in conjunction with Fig. 1, present embodiment is described, present embodiment is different from the specific embodiment five is that it also increases and has pressure gauge 12, and pressure gauge 12 is arranged on flue gas air mixed pipe line 7.Utilize the pressure in pressure gauge 12 monitoring flue gas air mixed pipe lines 7.Other composition and annexation are identical with the specific embodiment four.
The specific embodiment six: in conjunction with Fig. 1, present embodiment is described, present embodiment is different from the specific embodiment six is that it also increases and has gaseous mixture electric control valve 13, and gaseous mixture electric control valve 13 is arranged on flue gas air mixed pipe line 7.Utilize gaseous mixture electric control valve 13 to regulate the flow of gaseous mixture.Other composition and annexation are identical with the specific embodiment five.
The specific embodiment seven: present embodiment is described in conjunction with Fig. 1, present embodiment is different from the specific embodiment seven is that it also increases and has hot blast electric control valve 17, and hot blast electric control valve 17 is arranged on the hot-blast pipe line 16 between flue gas air mixed pipe line 7 and air preheater 15.Utilize hot blast electric control valve 17 to regulate the air quantity of hot blast.Other composition and annexation are identical with the specific embodiment six.
Claims (7)
1. in a stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system, described system comprises boiler (1), electric cleaner (2), boiler induced-draft fan (3), chimney (4), primary air fan (14), air preheater (15), hot-blast pipe line (16), medium-speed pulverizer (18) and a cold wind main line (19), one end of electric cleaner (2) is communicated with the back-end ductwork of boiler (1) by air preheater (15), the other end of electric cleaner (2) is communicated with the entrance point of boiler induced-draft fan (3), the port of export of boiler induced-draft fan (3) is communicated with chimney (4), primary air fan (14) is communicated with air preheater (15) by a cold wind main line (19), one end of hot-blast pipe line (16) is communicated with air preheater (15), the other end of hot-blast pipe line (16) is communicated with a wind entrance of medium-speed pulverizer (18), it is characterized in that: described system also comprises cold smoke pipeline (5), cold smoke blower fan (6), flue gas air mixed pipe line (7), a cold wind bye-pass (8) and stove internal heater (10), the entrance point of cold smoke pipeline (5) is communicated with the port of export of boiler induced-draft fan (3), the port of export of cold smoke pipeline (5) is communicated with cold smoke blower fan (6), the port of export of cold smoke blower fan (6) is communicated with one end of flue gas air mixed pipe line (7), the other end of flue gas air mixed pipe line (7) is communicated with hot-blast pipe line (16) by stove internal heater (10), stove internal heater (10) is arranged on the bottom in boiler (1), one end of a cold wind bye-pass (8) is communicated with hot-blast pipe line (16), the other end of a cold wind bye-pass (8) is communicated with flue gas air mixed pipe line (7).
2. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 1, it is characterized in that: described stove internal heater (10) adopts heat resisting cast steel to make.
3. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 2, it is characterized in that: described system also comprises a cold wind control valve (9), a described cold wind control valve (9) is arranged on a cold wind bye-pass (8).
4. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 3, it is characterized in that: described system also comprises thermometer (11), described thermometer (11) is arranged on flue gas air mixed pipe line (7).
5. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 4, it is characterized in that: described system also comprises pressure gauge (12), described pressure gauge (12) is arranged on flue gas air mixed pipe line (7).
6. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 5, it is characterized in that: described system also comprises gaseous mixture electric control valve (13), described gaseous mixture electric control valve (13) is arranged on flue gas air mixed pipe line (7).
7. in stove, add heat primary air and cold smoke drying brown coal positive pressure powder-making system according to claim 6, it is characterized in that: described system also comprises hot blast electric control valve (17), described hot blast electric control valve (17) is arranged on the hot-blast pipe line (16) between flue gas air mixed pipe line (7) and air preheater (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420296747.1U CN203848313U (en) | 2014-06-05 | 2014-06-05 | Positive pressure powder manufacturing system for drying brown coal through boiler interior heating primary air and cold smoke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420296747.1U CN203848313U (en) | 2014-06-05 | 2014-06-05 | Positive pressure powder manufacturing system for drying brown coal through boiler interior heating primary air and cold smoke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203848313U true CN203848313U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420296747.1U Expired - Lifetime CN203848313U (en) | 2014-06-05 | 2014-06-05 | Positive pressure powder manufacturing system for drying brown coal through boiler interior heating primary air and cold smoke |
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| CN (1) | CN203848313U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135458A (en) * | 2015-08-26 | 2015-12-09 | 烟台龙源电力技术股份有限公司 | Method and apparatus for improving furnace temperature of cyclone furnace |
| CN108006689A (en) * | 2016-11-02 | 2018-05-08 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of medium-speed milling pulverization system and temperature control control oxygen method suitable for predrying lignite |
| CN108097388A (en) * | 2017-12-27 | 2018-06-01 | 唐山博全实业有限公司 | A kind of ball mill heating plant and heat supply method |
-
2014
- 2014-06-05 CN CN201420296747.1U patent/CN203848313U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135458A (en) * | 2015-08-26 | 2015-12-09 | 烟台龙源电力技术股份有限公司 | Method and apparatus for improving furnace temperature of cyclone furnace |
| CN108006689A (en) * | 2016-11-02 | 2018-05-08 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of medium-speed milling pulverization system and temperature control control oxygen method suitable for predrying lignite |
| CN108097388A (en) * | 2017-12-27 | 2018-06-01 | 唐山博全实业有限公司 | A kind of ball mill heating plant and heat supply method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |