CN206131035U - Intermediate speed grinds whitewashed system suitable for predrying brown coal - Google Patents
Intermediate speed grinds whitewashed system suitable for predrying brown coal Download PDFInfo
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- CN206131035U CN206131035U CN201621176734.6U CN201621176734U CN206131035U CN 206131035 U CN206131035 U CN 206131035U CN 201621176734 U CN201621176734 U CN 201621176734U CN 206131035 U CN206131035 U CN 206131035U
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Abstract
The utility model relates to an intermediate speed grinds whitewashed system suitable for predrying brown coal, contain the medium speed pulverizer who connects gradually, the boiler, a coal economizer and an air preheater, wind tube coupling medium speed pulverizer of heat through air heater, connect the cold smoke pipeline on the air heater export rear flue, this tuber pipe way of cold smoke tube coupling heat, after taking out and mix, introduces in the cold smoke gas that will pass through burning and cooling medium speed pulverizer with wind of heat, adopt cold smoke gas + hot -air as medium speed pulverizer drying medium promptly, reduce the oxygen content in the coal pulverizer, reduce the danger of powder process system explosion, satisfy blast proof requirement, it is simultaneously looser to the control of temperature, the brown coal that grind in effective dry coal pulverizer, and the heat efficiency of the boiler is enhanced.
Description
Technical field
This utility model belongs to heat power plant boiler pulverized coal preparation system field, and in particular to power plant adopts heating power method predry
The medium-speed pulverizer pulverized coal preparation system of dry brown coal.
Background technology
The existing mode for grinding brown coal is to grind system using blower mill or medium-speed pulverizer grinds system.
Traditional medium-speed milling pulverization system grinds brown coal two problems：One be brown coal moisture it is high, medium-speed pulverizer is by dry
Dry medium（Hot blast）The restriction of temperature, its drying capacity is limited；Another is that brown coal fugitive constituent is high, explosive, and medium-speed pulverizer is adopted
Air pulverized coal conveying finished product, there is a problem of explosion-proof, need to strictly control disintegrating outlet temperature and oxygen content.
Traditional blower mill adopts flue gas+air as dried medium and coal dust pumped (conveying) medium, though do not exist above-mentioned
Two problems, but because the wear-out part life-span of fan mill is low, operation maintenance workload is big, and operational reliability is not so good as medium-speed pulverizer.Electricity
Factory is more desirable to using middling speed grinding system.
Brown coal first carry out predrying into before medium-speed pulverizer, it is possible to resolve the not enough problem of medium-speed pulverizer drying capacity.Except control
Outside naked light burning things which may cause a fire disaster processed, control coal dust temperature and dried medium oxygen content are the explosion-proof measures of thermal power plant pulverized coal preparation system.
Thermal power plant medium-speed pulverizer pulverized coal preparation system, raw coal heats up drying in coal pulverizer, dried medium be hot-air+
Cold air, according to《Thermal power plant coal and pulverized coal preparation system Explosion-proof Design technical regulation》The explosion-proof requirement of middle pulverized coal preparation system, for
Brown coal, go out one's intention as revealed in what one says powder mixing temperature and are generally not more than 70 DEG C.But it is brown after being dried in fact, in having the pre-dried system of brown coal
Coal temperature has risen, and according to particle diameter and the difference of the time of staying, general coal grain mean temperature can be increased to more than 60 DEG C, or even
Up to 90 DEG C or so.Drying is further heated up in coal pulverizer, using the hot-air+cold of traditional medium-speed pulverizer pulverized coal preparation system
Air is used as dried medium, it is difficult to meet the explosion-proof requirement of pulverized coal preparation system.Meanwhile, coal pulverizer（Or system end）Highest allows oxygen
Content（Volume share）For 12%.And hot-air+cold air is adopted as the conventional medium-speed milling pulverization system of dried medium, it is dried
Oxygen content in medium air is 21%, is fixed value, can only be by controlling evaporated water, and then control coal pulverizer outlet oxygen contains
Amount.And the water yield being evaporated from coal, and it is many with pulverizer outlet temperature and raw coal moisture content and coal pulverizer interior circulation rate etc.
Factor is relevant, and actual motion is not intended as the operation controlling value of coal pulverizer.So, conventional middling speed grinding system wants that controlling coal pulverizer goes out
The oxygen content of mouth 12% requires there is very big design difficulty and operation difficulty.
Utility model content
The technical problem that this utility model is solved can solve medium-speed pulverizer and be dried and explosive problem in offer one kind
The medium-speed milling pulverization system suitable for predrying brown coal.
The technological means that this utility model is adopted are as follows.
A kind of medium-speed milling pulverization system suitable for predrying brown coal, comprising the medium-speed pulverizer, boiler, the sky that are sequentially connected
Air preheater, through the heat primary air pipeline of air preheater medium-speed pulverizer, also comprising cold smoke pipeline, the cold smoke pipeline are connected
One end is connected on the flue after the air preheater outlet, and the other end is connected through the heat primary air pipe after air preheater
Road.
Cold smoke blower fan is set on the cold smoke pipeline.
Cleaner unit is set after the air preheater outlet, the cold smoke pipeline is connected on the flue after cleaner unit.
Heat primary air pipeline sets apparatus for measuring air quantity after converging with cold smoke pipeline.
Raw coal temperature into medium-speed pulverizer is 60-90 DEG C, in heat primary air pipeline after air preheater heating
An air temperature be 320-360 DEG C, the cold flue gas temperature in cold smoke pipeline be 90-140 DEG C, the discharging opening temperature of medium-speed pulverizer
Not higher than 180 DEG C of degree, and discharging opening oxygen content is not higher than 12%.
Having the beneficial effect that produced by this utility model.
1. the cold flue gas after burning are introduced medium-speed pulverizer by this utility model, i.e., using cold flue gas+hot-air as in
Speed coal mill dried medium, realizes reducing dried medium oxygen content by allocating flue gas and AIR Proportional, that is, control coal pulverizer and go out
Oxygen content is less than 12% in gas, reduces the danger of explosion of Coal Pulverizing System, meets explosion-proof requirement.Meanwhile, middling speed coal-grinding
Machine outlet wind powder mixture temperature can not be limited using air by traditional as 70 DEG C during dried medium, compare fan grinding system
Brown coal are ground, during using flue gas and air gas mixture as dried medium, coal pulverizer outlet maximum permissible temperature can allow to reach
To 180 DEG C, it is preferred with 150 DEG C, boiler thermal output can be effectively improved.
2. this utility model makes Jing by the use of the drying and pumped (conveying) medium of the mixture as medium-speed pulverizer of air and flue gas
The pre-dried brown coal with uniform temperature of overheated force method are further dried during grinding into medium-speed pulverizer, and will
The qualified coal dust that coal pulverizer grinds is conveyed into boiler furnace burning.
3. scheme of the present utility model solves brown coal temperature after heating power method is predrying and rises, empty using conventional heat
When gas+cold air is as medium-speed pulverizer dried medium, the coal pulverizer for being brought goes out one's intention as revealed in what one says powder mixing temperature beyond the permission upper limit
Hidden danger.Simultaneously boiler wind speed adjustment can be improved, advantageously reduce the discharge value of boiler nitrogen oxides.
Description of the drawings
Fig. 1 is the structural representation of utility model.
Specific embodiment
This utility model protects a kind of medium-speed milling pulverization system suitable for predrying brown coal, particularly a kind of malleation blow-through
Formula second medium is dried pulverized coal preparation system.
The thermal power plant of conventional employing medium-speed pulverizer system, comprising the feeder, medium-speed pulverizer 9, pot being sequentially connected
Stove 1, air preheater 3, cleaner unit 4, air-introduced machine 5, chimney.Bunker coal is conveyed to medium-speed pulverizer 9 by feeder, in coal pulverizer
In 9 after the combination drying medium of hot blast+cold wind is dried, boiler-burner 16 is sent into by pulverized coal channel.And the system is dry
It is dry limited in one's ability, and oxygen content should not control, and be not suitable for the thermal power plant of burning high-moisture brown coal.
For the thermal power plant for using high moisture content brown coal preferably adopts fanned powder-grinding system or with the predrying brown coal of heating power method
Medium-speed pulverizer pulverized coal preparation system., due to fan mill wear-out part short life, operation maintenance workload is big, power plant for fanned powder-grinding system
It is general not like to adopt.
Based on this, the utility model proposes a kind of safely and efficiently suitable for the medium-speed milling pulverization system of predrying brown coal.
As shown in figure 1, comprising the medium-speed pulverizer 9, boiler 1, the air preheater 3 that are sequentially connected, medium-speed pulverizer 9 is connected with through sky
The heat primary air pipeline 71 of air preheater.
It is of the present utility model to focus on, part cold flue gas are extracted after cleaner unit 4, it is mixed into through the supercharging of cold smoke blower fan 6
Drying and pumped (conveying) medium of the mixture of heat primary air pipeline 71, hot-air and cold flue gas as medium-speed pulverizer.Realize above-mentioned
The device of process is cold smoke pipeline 61, and on the flue after the one end of cold smoke pipeline 61 connection outlet of air preheater 3, the other end connects
Connect on the heat primary air pipeline 71 after air preheater 3, cold smoke blower fan 6 is set on cold smoke pipeline 61, by cold smoke blower fan 6
The cold flue gas for being drawn Jing air preheaters cooling after burning are used in mixed way into heat primary air pipeline, after heat primary air and cold flue gas are converged
Pipeline on can set apparatus for measuring air quantity 12, to regulate and control, monitor in real time air quantity and other parameter values.
Air preheater 3 export it is latter as cleaner unit 4 is all set, above-mentioned cold smoke pipeline 61 is also connected to after cleaner unit 4
Flue on, make the use condition of the cold flue gas that extraction uses more preferably.Air-introduced machine 5, cold smoke pipeline 61 can be also provided with after cleaner unit 4
May also be arranged on the flue after air-introduced machine 5.
Be provided with primary air fan 7 before the air inlet preheater of heat primary air pipeline 71, by primary air fan provide wind regime and
Power.Connect cold primary air duct 72 between air preheater and primary air fan 7, sealing air is set on cold primary air duct 72
Machine 10, the other end of the cold primary air duct 72 connection medium-speed pulverizer 9, to provide coal pulverizer sealing air.Above-mentioned cold First air
The set-up mode of pipeline 72 and seal fan can be as shown in figure 1, or the general existing mode of other skilled in the art.
As shown in figure 1, can also include the pressure fan 8 for sending into secondary wind, the outlet secondary air channel of pressure fan 8 in system
Road 81, the secondary wind pipeline 81 is connected to secondary air box 15 after the intensification of air preheater 3, eventually enters into burner 16.
Valve is equipped with above-mentioned heat primary air pipeline 71, cold smoke pipeline 61, can making according to medium-speed pulverizer at any time
With demand modeling First air, the flow of cold flue gas, so as to control the temperature and oxygen content of coal pulverizer outlet.
Using the above-mentioned medium-speed milling pulverization system that cold flue gas+hot-air is passed through into medium-speed pulverizer, middling speed is generally entered
The raw coal temperature of coal pulverizer 9 is 60-90 DEG C, and the heat primary air temperature after air preheater is heated is 320-360 DEG C, is extracted
Cold flue gas temperature be 90-140 DEG C, cold flue gas and heat primary air are allocated by valve on cold smoke pipeline and heat primary air pipeline
Different proportion, so as to reach the discharging opening temperature control of medium-speed pulverizer 9 at not higher than 180 DEG C, and discharging opening oxygen content is not
Higher than 12%.
Pre-dried device can adopt existing drying machine 11, and it passes through feed valve 17 will send into through pre-dried brown coal
Coal pulverizer 9.The discharging opening of medium-speed pulverizer 9 is connected with the burner 16 of boiler 1, and coal dust pipeline therebetween can arrange pulverized coal distributor
13 and isolation door 14.
In addition, can also select as needed to increase SCR denitration device 2 before air preheater 3.
It is below the method using temperature and oxygen content is controlled during said system.
First, milling, drying are carried out into medium-speed pulverizer 9 through pre-dried 60-90 DEG C of raw coal, into burner 16
Burn with boiler 1, the heat smoke for producing that burns forms 90-140 DEG C of cold flue gas after the cooling of air preheater 3.
First air in heat primary air pipeline enters medium-speed pulverizer after air preheater 3 is heated to 320-360 DEG C
9, there is provided dried medium, while cold smoke blower fan 6 is drawn a part of cold flue gas entering in cold smoke pipeline 61, with primary air duct 71
Heat primary air mixes, and by pipe valve flow and mixed proportion are controlled, and medium-speed pulverizer 9 is entered after mixing, heats and is dried
The raw coal of milling in medium-speed pulverizer 9, and the mixed proportion of cold flue gas and heat primary air is regulated and controled so as to control mill by valve
Coal machine outlet temperature is not higher than 180 DEG C, and oxygen content is not higher than 12%.
It is below specific embodiment parameter.
Embodiment 1.
Milling, drying are carried out into medium-speed pulverizer 9 through pre-dried 70 DEG C of raw coal, into burner 16 and boiler 1
Burning, the heat smoke for producing that burns forms 135 DEG C of cold flue gas after the cooling of air preheater 3.
First air in heat primary air pipeline enters medium-speed pulverizer 9 after air preheater 3 is heated to 350 DEG C, carries
For temperature and dried medium, while cold smoke blower fan 6 is drawn a part of above-mentioned cold flue gas into cold smoke pipeline 61, with primary air duct
The raw coal of medium-speed pulverizer 9, heating and the dry milling in medium-speed pulverizer 9 is entered after heat primary air mixing in 71, and it is logical
The mixed proportion of valve regulation and control cold flue gas and heat primary air is crossed so as to control 150 DEG C of pulverizer outlet temperature, oxygen content 10%.
Embodiment 2.
Milling, drying are carried out into medium-speed pulverizer 9 through pre-dried 90 DEG C of raw coal, into burner 16 and boiler 1
Burning, the heat smoke for producing that burns forms 140 DEG C of cold flue gas after the cooling of air preheater 3.
First air in heat primary air pipeline enters medium-speed pulverizer 9 after air preheater 3 is heated to 330 DEG C, carries
For temperature and dried medium, while cold smoke blower fan 6 is drawn a part of above-mentioned cold flue gas into cold smoke pipeline 61, with primary air duct
The raw coal of medium-speed pulverizer 9, heating and the dry milling in medium-speed pulverizer 9 is entered after heat primary air mixing in 71, and it is logical
The mixed proportion of valve regulation and control cold flue gas and heat primary air is crossed so as to control coal pulverizer outlet oxygen content 12%.
Cold First air in cold primary air duct 72 is selectively passed through medium-speed pulverizer 9, reduces pulverizer outlet temperature
For 140 DEG C.
Embodiment 3.
Milling, drying are carried out into medium-speed pulverizer 9 through pre-dried 70 DEG C of raw coal, into burner 16 and boiler 1
Burning, the heat smoke for producing that burns forms 120 DEG C of cold flue gas after the cooling of air preheater 3.
First air in heat primary air pipeline enters medium-speed pulverizer 9 after air preheater 3 is heated to 340 DEG C, carries
For temperature and dried medium, while cold smoke blower fan 6 is drawn a part of above-mentioned cold flue gas into cold smoke pipeline 61, with primary air duct
The raw coal of medium-speed pulverizer 9, heating and the dry milling in medium-speed pulverizer 9 is entered after heat primary air mixing in 71, and it is logical
The mixed proportion of valve regulation and control cold flue gas and heat primary air is crossed so as to control coal pulverizer outlet oxygen content 11%.
Cold First air in cold primary air duct 72 is selectively passed through medium-speed pulverizer 9, reduces pulverizer outlet temperature
For 150 DEG C.
Embodiment 4.
Milling, drying are carried out into medium-speed pulverizer 9 through pre-dried 80 DEG C of raw coal, into burner 16 and boiler 1
Burning, the heat smoke for producing that burns forms 90 DEG C of cold flue gas after the cooling of air preheater 3.
First air in heat primary air pipeline enters medium-speed pulverizer 9 after air preheater 3 is heated to 360 DEG C, carries
For temperature and dried medium, while cold smoke blower fan 6 is drawn a part of above-mentioned cold flue gas into cold smoke pipeline 61, with primary air duct
The raw coal of medium-speed pulverizer 9, heating and the dry milling in medium-speed pulverizer 9 is entered after heat primary air mixing in 71, and it is logical
The mixed proportion of valve regulation and control cold flue gas and heat primary air is crossed so as to control coal pulverizer outlet oxygen content 10%.
Cold First air in cold primary air duct 72 is selectively passed through medium-speed pulverizer 9, reduces pulverizer outlet temperature
For 130 DEG C.
Claims (5)
1. a kind of medium-speed milling pulverization system suitable for predrying brown coal, comprising the medium-speed pulverizer being sequentially connected（9）, boiler
（1）, air preheater（3）, it is characterised in that through the heat primary air pipeline of air preheater（71）Connection medium-speed pulverizer
（9）, also comprising cold smoke pipeline（61）, the cold smoke pipeline（61）One end is connected to the air preheater（3）Flue after outlet
On, the other end is connected through the heat primary air pipeline after air preheater（71）.
2. a kind of medium-speed milling pulverization system suitable for predrying brown coal as claimed in claim 1, it is characterised in that described cold
Smoke pipe road（61）Upper setting cold smoke blower fan（6）.
3. a kind of medium-speed milling pulverization system suitable for predrying brown coal as claimed in claim 2, it is characterised in that the sky
Air preheater（3）Cleaner unit is set after outlet（4）, the cold smoke pipeline（61）It is connected to cleaner unit（4）On flue afterwards.
4. a kind of medium-speed milling pulverization system suitable for predrying brown coal as claimed in claim 1, it is characterised in that heat is once
Air pipe line（71）With cold smoke pipeline（61）Apparatus for measuring air quantity is set after converging（12）.
5. a kind of medium-speed milling pulverization system suitable for predrying brown coal as described in Claims 1-4 is arbitrary, its feature exists
In into medium-speed pulverizer（9）Raw coal temperature be 60-90 DEG C, after air preheater is heated in heat primary air pipeline
One time air temperature is 320-360 DEG C, cold smoke pipeline（61）Interior cold flue gas temperature is 90-140 DEG C, medium-speed pulverizer（9）Go out
Material mouth temperature is not higher than 180 DEG C, and discharging opening oxygen content is not higher than 12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621176734.6U CN206131035U (en) | 2016-11-02 | 2016-11-02 | Intermediate speed grinds whitewashed system suitable for predrying brown coal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621176734.6U CN206131035U (en) | 2016-11-02 | 2016-11-02 | Intermediate speed grinds whitewashed system suitable for predrying brown coal |
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| CN206131035U true CN206131035U (en) | 2017-04-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112082149A (en) * | 2020-09-08 | 2020-12-15 | 东方电气集团东方锅炉股份有限公司 | Flue gas recirculation lignite drying method and drying system |
-
2016
- 2016-11-02 CN CN201621176734.6U patent/CN206131035U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112082149A (en) * | 2020-09-08 | 2020-12-15 | 东方电气集团东方锅炉股份有限公司 | Flue gas recirculation lignite drying method and drying system |
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