CN105570924A - Method for substituting primary air heater and preventing explosion of coal pulverizing system through hot air recirculation - Google Patents
Method for substituting primary air heater and preventing explosion of coal pulverizing system through hot air recirculation Download PDFInfo
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- CN105570924A CN105570924A CN201510941721.7A CN201510941721A CN105570924A CN 105570924 A CN105570924 A CN 105570924A CN 201510941721 A CN201510941721 A CN 201510941721A CN 105570924 A CN105570924 A CN 105570924A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/103—Pulverizing with hot gas supply
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a method for substituting a primary air heater and preventing the explosion of a coal pulverizing system through hot air recirculation. The method is characterized by comprising the following steps that cold smoke at an outlet of an induced draft fan is pumped and mixed with primary air, the primary air is heated for substituting the heater, and the explosion of the coal pulverizing system is prevented at the same time. By the adoption of the method for substituting the primary air heater and preventing the explosion of the coal pulverizing system through hot air recirculation, the boiler efficiency can be improved by 0.24%, and the NOx content is decreased by about 9%.
Description
Technical field
The present invention relates generally to a kind of method that alternative First air steam air heater and thermal wind sensor prevent explosion of Coal Pulverizing System.
Background technology
In boiler design, in order to prevent air preheater generation cold end corrosion and improve boiler economics, usually adopt two schemes: a kind of for installing steam air heater system at fans entrance, another kind is thermal wind sensor system.
Along with the development of large-sized station boiler technology, various steam air heater technology is also constantly developed, but be the heating surface of two media heat exchange, fans entrance resistance is not only increased in this system cloud gray model, and often leak, many difficult problems such as stifled ash, water attack, add because Structure and energy problem causes maintenance difficulty, even cannot put into operation time serious.
And adopt thermal wind sensor technology to consider that the layout of heating surface adopts rotary regenerative air preheater usually due to large-sized station boiler.Rotary regenerative air preheater adopts three points of chamber structures usually, is divided into fume side and air side, and wherein air side is divided into again First air and Secondary Air.Owing to containing certain dust in flue gas, air preheater heat exchanger fin is very intensive, when rotated, there is the First air of certain speed and Secondary Air easily the dust in air preheater is carried and enter blower fan, fan blade brings serious wear problem, and wherein axial flow blower is more responsive, outstanding because working method is different from centrifugal blower dust wear problem.
Summary of the invention
Goal of the invention: the invention provides a kind of method that alternative First air steam air heater and thermal wind sensor prevent explosion of Coal Pulverizing System, its objective is that solving steam air heater in the past not only increases fans entrance resistance in running, and often leak, many difficult problems such as stifled ash, water attack, add because Structure and energy problem causes maintenance difficulty, even cannot put into operation time serious existing problem.
Technical scheme:
Alternative First air steam air heater and thermal wind sensor prevent a method for explosion of Coal Pulverizing System, it is characterized in that: the step of the method is as follows:
Extract air-introduced machine outlet cold smoke to mix with First air, add heat primary air and substitute steam air heater and prevent explosion of Coal Pulverizing System simultaneously.
Because oxygen content in flue gas is lower between 4% ~ 6%, send into pulverized coal preparation system as inert gas, change pulverized coal preparation system medium composition, whole pulverized coal preparation system oxygen concentration is controlled, within 16%, to reach requirement of explosion proof comprehensively.
Consider to contain certain sulphur content in flue gas, take to control mist temperature during operation and be not less than acid dew point important measures more than 50 DEG C.
Choosing of key parameter
It is as shown in table 1 that ature of coal chooses coal characteristic.
The cigarette temperature of choosing of cigarette temperature chooses 130 DEG C, underload 118 DEG C.
Table 1 designing coal quality burns different proportion Brown Coal characteristic with mixing
The selection environment temperature of environment temperature chooses 26 DEG C, minimum-26 DEG C.
Choosing of tubing surveys extraction point place black furnace cigarette temperature at 118 ~ 130 DEG C, therefore chooses carbon steel Q235-A as taking out black furnace smoke pipe material.
Oxygen amount be chosen at more than 90% rated load time, actual measurement air-introduced machine entrance oxygen amount mean value is 6.23%, and outlet and entrance oxygen amount are more or less the same, and therefore extraction point oxygen amount chooses 6.3%.Choose measured value 9.2% during underload to calculate.
Coal dust moisture choose Rational choice coal dust moisture, with reference to test data when this factory 200MW unit boiler mixes burning brown coal, coal dust moisture chooses actual value 6%.
Primary air fan entrance wind-warm syndrome controls primary air fan entrance mixing air temperature and is not less than 50 DEG C, prevents it from causing primary air fan to vibrate and bulk erosion lower than acid dew point.
Inerting parameter is mixed with First air by cold flue gas, ensures that pulverized coal preparation system oxygen amount is not less than 16%.
The pipeline extracting air-introduced machine outlet cold smoke inserts primary air fan entrance casing and mixes with First air.
Advantage and effect: patent of the present invention provides a kind of alternative First air steam air heater and thermal wind sensor to prevent the method for explosion of Coal Pulverizing System, which solve in the past existing problem, propose extraction air-introduced machine outlet cold smoke to mix with First air, add heat primary air and substitute steam air heater and a kind of method simultaneously preventing explosion of Coal Pulverizing System.
Meanwhile, because oxygen content in flue gas is lower between 4% ~ 6%, send into pulverized coal preparation system as inert gas, change pulverized coal preparation system medium composition, whole pulverized coal preparation system oxygen concentration is controlled, within 16%, to reach requirement of explosion proof comprehensively.Consider to contain certain sulphur content in flue gas, take to control mist temperature during operation and be not less than acid dew point important measures more than 50 DEG C.Take this invention technology can improve boiler efficiency 0.24%, reduce about NOx9%.。
Accompanying drawing illustrates:
Fig. 1 is enforcement schematic diagram of the present invention.
Detailed description of the invention: the present invention is described further below in conjunction with accompanying drawing:
As shown in Figure 1, the invention provides a kind of method that alternative First air steam air heater and thermal wind sensor prevent explosion of Coal Pulverizing System, extract air-introduced machine outlet cold smoke to mix with First air, add heat primary air and substitute steam air heater and a kind of method simultaneously preventing explosion of Coal Pulverizing System device.
Meanwhile, because oxygen content in flue gas is lower between 4% ~ 6%, send into pulverized coal preparation system as inert gas, change pulverized coal preparation system medium composition, whole pulverized coal preparation system oxygen concentration is controlled, within 16%, to reach requirement of explosion proof comprehensively.Consider to contain certain sulphur content in flue gas, take to control mist temperature during operation and be not less than acid dew point important measures more than 50 DEG C.
Application prospect
At present, along with the raising of national environmental protection emission request, adopt the flue gas concentration after advanced dedusting technology to reduce further, be no more than 5mg/Nm
3blower fan is solved because of travel fatigue wear problem, and therefore, this invention technology can not only be applied on the boiler of primary air fan system with centrifugal blower, has axial flow First air blower fan system boiler provide possibility for being applied in further.
At present, large-sized station boiler 600MW and above unit all adopt axial flow blower, and often mix the different coal of burning for reducing boiler oil cost, this patent of invention is applied in above-mentioned large-sized station boiler and substitutes First air steam air heater device or thermal wind sensor, prevent from having unit pulverized-coal system to use high-volatile coal and blast, this patented technology is adopted to transform, redesign to the boiler put into operation and design phase boiler, ensure boiler safety, environmental protection, economical operation, will wide market be had.
Example application
Apply at Fuxin electricity generating corporation, Ltd 350MW unit boiler.
Choosing of key parameter
It is as shown in table 1 that ature of coal chooses coal characteristic.
The cigarette temperature of choosing of cigarette temperature chooses 130 DEG C, underload 118 DEG C.
Table 1 designing coal quality burns different proportion Brown Coal characteristic with mixing
The selection environment temperature of environment temperature chooses 26 DEG C, minimum-26 DEG C.
Choosing of tubing surveys extraction point place black furnace cigarette temperature at 118 ~ 130 DEG C, therefore chooses carbon steel Q235-A as taking out black furnace smoke pipe material.
Oxygen amount be chosen at more than 90% rated load time, actual measurement air-introduced machine entrance oxygen amount mean value is 6.23%, and outlet and entrance oxygen amount are more or less the same, and therefore extraction point oxygen amount chooses 6.3%.Choose measured value 9.2% during underload to calculate.
Coal dust moisture choose Rational choice coal dust moisture, with reference to test data when this factory 200MW unit boiler mixes burning brown coal, coal dust moisture chooses actual value 6%.
Primary air fan entrance wind-warm syndrome controls primary air fan entrance mixing air temperature and is not less than 50 DEG C, prevents it from causing primary air fan to vibrate and bulk erosion lower than acid dew point.
Inerting parameter is mixed with First air by cold flue gas, ensures that pulverized coal preparation system oxygen amount is not less than 16%.
Result of calculation
Result of calculation under BMCR operating mode is shown in Table 2.
Improvement and design result of calculation under table 2BMCR operating mode
3 running on the lower load calculate
When boiler is at underload, exhaust gas temperature reduces, and needs the cold smoke amount provided also will change, because this has been the calculating of running on the lower load.Specifically in table 3.
Pulverized coal preparation system calculation and check under table 3 underload
See from table 3, it is 42.7% that black furnace cigarette accounts for primary air fan outlet mixed flue gas quality share, then whole pulverized coal preparation system can reach safety anti-explosive requirement.Owing to being now that 2 coal pulverizers run, coal pulverizer outlet oxygen content is about 13.7%, meets the requirement of pulverized coal preparation system safety anti-explosive.
From result of calculation, extracting under the exhaust gas volumn required for calculating, when mixing burning 30% brown coal, coal pulverizer gross capability can reach the allowance coefficient under BMCR required by Fuel Consumption.
Whether design booster fan, determine according to place and circuit design, if resistance is large, the cold smoke amount extracted cannot be ensured, then need to set up booster fan, otherwise the direct short-circuit of primary air fan intake air, required exhaust gas volumn cannot be obtained.
Result of use
Black furnace attribute testing is smoked under 190% rated load
During test, 3 coal pulverizers all drop into and bilateral operation, change cold smoke fans entrance door aperture, the black furnace smoke which of preheater outlet heat primary air oxygen content and extraction under measurement three operating modes respectively, the powder system of record-keeping system simultaneously primary operating parameter, under 320MW unit load, black furnace cigarette attribute testing the results are shown in Table shown in 4.
Cold smoke amount result of the test is taken out under table 490% rated load
Can see from table 4, under test coal condition, when A side, cold smoke blower fan aperture is about 55%, and the cold smoke amount of extraction is 56.4t/h, primary air fan entrance mixing temperature 53 DEG C, and pulverized coal preparation system terminal oxygen content is about 15.4%.B side cold smoke blower fan aperture is about 37%, and the cold smoke amount of extraction is 50.37t/h, primary air fan entrance mixing temperature 52 DEG C, and pulverized coal preparation system terminal oxygen content is about 15.5%.Total cold smoke amount that now both sides are extracted is 106.77t/h.The safety anti-explosive and drying capacity requirement of mixing pulverized coal preparation system after burning brown coal can be met completely.
Black furnace attribute testing is smoked under 257% rated load
When unit is in underrun, because boiler operatiopn oxygen amount increases, black furnace cigarette oxygen content increases, and for ensureing that pulverized coal preparation system terminal oxygen content is below 16%, the cold smoke tolerance extracted during underload also will increase.During test, 2 coal pulverizers drop into and bilateral operation, the black furnace smoke which of preheater outlet heat primary air oxygen content and extraction under measurement three operating modes respectively, the powder system of record-keeping system simultaneously primary operating parameter, under 200MW unit load, black furnace cigarette attribute testing the results are shown in Table shown in 5.
Cold smoke amount result of the test is taken out under table 557% rated load
Can see from table 5, when A side, cold smoke blower fan aperture is about 54%, and the cold smoke amount of extraction is 51.61t/h, primary air fan entrance mixing temperature 51 DEG C, and pulverized coal preparation system terminal oxygen content is about 16.1%; B side cold smoke blower fan aperture is about 35%, and the cold smoke amount of extraction is 46.96t/h, primary air fan entrance mixing temperature 51 DEG C, and pulverized coal preparation system terminal oxygen content is about 16.0%.Total cold smoke amount that now both sides are extracted is 98.57t/h, and pulverizer outlet temperature, substantially at 60 ~ 62 DEG C, can meet the safety anti-explosive and drying capacity requirement of mixing pulverized coal preparation system after burning brown coal.
This invention technology is applied in Fuxin genco 350MW unit boiler 4 years, air preheater cold-end air is found in order by checking during overhaul, in operation, fume side pressure reduction is all in normal range (NR), never there is blast in boiler milling system, boiler exhaust gas used heat is utilized effectively, and cold smoke maximum extraction amount only accounts for the total exhaust gas volumn 9% of boiler, boiler efficiency improves 0.24%, NOx reduces about 9%, and boiler operatiopn is reliable, and economy significantly improves.Primary air fan offsets with cancellation steam air heater drag reduction because pumped (conveying) medium variations in temperature resistance increases, and fan performance is constant.
Claims (5)
1. alternative First air steam air heater and thermal wind sensor prevent a method for explosion of Coal Pulverizing System, it is characterized in that: the step of the method is as follows:
Extract air-introduced machine outlet cold smoke to mix with First air, add heat primary air and substitute steam air heater and prevent explosion of Coal Pulverizing System simultaneously.
2. alternative First air steam air heater according to claim 1 and thermal wind sensor prevent the method for explosion of Coal Pulverizing System, it is characterized in that: because oxygen content in flue gas is lower between 4% ~ 6%, pulverized coal preparation system is sent into as inert gas, change pulverized coal preparation system medium composition, whole pulverized coal preparation system oxygen concentration is controlled, within 16%, to reach requirement of explosion proof comprehensively.
3. alternative First air steam air heater according to claim 2 and thermal wind sensor prevent the method for explosion of Coal Pulverizing System, it is characterized in that: consider to contain certain sulphur content in flue gas, take to control mist temperature during operation and be not less than acid dew point important measures more than 50 DEG C.
4. alternative First air steam air heater according to claim 1 and thermal wind sensor prevent the method for explosion of Coal Pulverizing System, it is characterized in that: choosing of key parameter
It is as shown in table 1 that ature of coal chooses coal characteristic;
The cigarette temperature of choosing of cigarette temperature chooses 130 DEG C, underload 118 DEG C;
Table 1 designing coal quality burns different proportion Brown Coal characteristic with mixing
The selection environment temperature of environment temperature chooses 26 DEG C, minimum-26 DEG C;
Choosing of tubing surveys extraction point place black furnace cigarette temperature at 118 ~ 130 DEG C, therefore chooses carbon steel Q235-A as taking out black furnace smoke pipe material;
Oxygen amount be chosen at more than 90% rated load time, actual measurement air-introduced machine entrance oxygen amount mean value is 6.23%, and outlet and entrance oxygen amount are more or less the same, and therefore extraction point oxygen amount chooses 6.3%; Choose measured value 9.2% during underload to calculate;
Coal dust moisture choose Rational choice coal dust moisture, with reference to test data when this factory 200MW unit boiler mixes burning brown coal, coal dust moisture chooses actual value 6%;
Primary air fan entrance wind-warm syndrome controls primary air fan entrance mixing air temperature and is not less than 50 DEG C, prevents it from causing primary air fan to vibrate and bulk erosion lower than acid dew point;
Inerting parameter is mixed with First air by cold flue gas, ensures that pulverized coal preparation system oxygen amount is not less than 16%.
5. alternative First air steam air heater according to claim 1 and thermal wind sensor prevent the method for explosion of Coal Pulverizing System, it is characterized in that: the pipeline extracting air-introduced machine outlet cold smoke inserts primary air fan entrance casing and mixes with First air.
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| CN201510941721.7A CN105570924A (en) | 2015-12-16 | 2015-12-16 | Method for substituting primary air heater and preventing explosion of coal pulverizing system through hot air recirculation |
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| CN201510941721.7A CN105570924A (en) | 2015-12-16 | 2015-12-16 | Method for substituting primary air heater and preventing explosion of coal pulverizing system through hot air recirculation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705117A (en) * | 2017-01-22 | 2017-05-24 | 华北电力科学研究院有限责任公司 | Primary air system of thermal power plant and start and stop control method of primary air system |
| CN106705113A (en) * | 2016-12-13 | 2017-05-24 | 华电电力科学研究院东北分院 | Safety explosion-proof device and method for enabling coal boiler to use urn high-volatility coal as fuel, of intermediate storage type coal pulverizing system |
| CN109210562A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of device and its working method explosion-proof for π type boiler the ball type pulverizer system |
| CN113324332A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Air temperature regulating and controlling system for powder process system, powder process system and boiler system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109210562A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of device and its working method explosion-proof for π type boiler the ball type pulverizer system |
| CN113324332A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Air temperature regulating and controlling system for powder process system, powder process system and boiler system |
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