CN1056684C - Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and apparatus thereof - Google Patents
Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and apparatus thereof Download PDFInfo
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- CN1056684C CN1056684C CN 93120983 CN93120983A CN1056684C CN 1056684 C CN1056684 C CN 1056684C CN 93120983 CN93120983 CN 93120983 CN 93120983 A CN93120983 A CN 93120983A CN 1056684 C CN1056684 C CN 1056684C
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Abstract
The present invention discloses a pulverized fuel boiler oil-less stage electric igniting and low load peaking automatic stable combustion method and a device thereof. A central electric heating tube (rod) arranged in an original primary wind burner jet tube is used for igniting a first stage pulverized coal torch of a low flow rate, a nearby second stage pulverized coal gas stream of a high flow rate is ignited consequently, and the pulverized coal is orderly ignited by stages. After the pulverized coal is ignited, when low loads of a boiler are peaked or loads are not stable, the electric heating tube (rod) is automatically switched on according to the change conditions of boiler temperature or the heating power of the electric heating tube (rod) is automatically adjusted to achieve the purpose of stable combustion. The present invention has the advantages of high igniting speed, simple operation and low electric consumption, is an igniter as well as a burner, and realizes the oil-less multi-stage strengthened ignition and the stable combustion of the pulverized coal.
Description
The present invention relates to pulverized coal boiler ignition and smooth burning method and device, especially relate to pulverized-coal fired boiler electric ignition and smooth burning method and device.
Burner is the key equipment of boiler, is the organizer of fuel stable ignition burning, and therefore, the performance of burner quality meeting ground directly has influence on the security and the economy of boiler operatiopn.At present thermal power plant's pulverized-coal fired boiler that China's consume fuel is maximum is stablized when combustion-supporting in igniting or at underload, all be in burner, set up an office kerosene rifle even big capacity oil gun, when ignition of the boiler, use a large amount of fuel oil earlier, make and drop into coal dust after temperature is raised to certain value in the stove, cause unstable combustion regularly at low-load combustion-stabilizing and other reason, it is combustion-supporting also to drop into oil gun, and this method of operation can satisfy safe operation of the boiler, but need to consume a large amount of fuel oil, or even high-quality light diesel fuel.According to statistics, the each igniting of 670t/h pulverized-coal fired boiler needs more than the fuel oil 55t/h, and be used for combustion-supporting fuel oil more than 1000 tons every year.At present, the fuel oil that China is used to light a fire every year reaches more than 500,000 tons, and appropriate litigation fees is considerable, and along with developing rapidly of China's industrial economy, more much types power plant will be constructed and put into operation, and this problem will be outstanding further.Moreover in recent years, China's fuel oil supply wretched insufficiency, the oil price costliness, relevant department is the important indicator of generating oil consumption as a measurement benefit.
For this reason, domestic and international many units and scholar propose various novel combustion technologies, attempt to reduce the pulverized-coal fired boiler fuel consumption, strengthen the smooth combustion of catching fire but all rest on, and reduce the oil consumption stage, need not just can not light a fire or combustion-supporting purpose by oil and reach.As bluff body burner, the ship shape multifunctional burner, the high speed difference jet, technology such as pre-combustion chamber burner in the overheavy firing of coal dust stable ignition, particularly at colm, all have important breakthrough, obtain encouraging success.Igniting also can fuel savings oil when the low-load combustion-stabilizing, it is reported that the saving rate can reach 60～70%, but still not have thoroughly to change or eliminate the method that tradition is used the oil drop fire, the fuel oil total amount that disappears still very considerable.Abroad, as U.S. combustion enginnering company, Mitsubishi heavy industry company etc. have also developed various coal powder light-dark isolation technics and burner in recent years in succession, aspect coal dust (particularly colm) the reinforcement ignition smooth combustion remarkable result is being arranged, but aspect oily, still having similar problem.U.S. company is the plasma direct-fire technology of exploitation recently, can save but fuel oil, but price is very expensive, embarrasses the user to accept.
The purpose of this invention is to provide a kind of pulverized-coal fired boiler electric ignition and smooth burning method and device.
The present invention takes following measures in order to achieve the above object:
Pulverized-coal fired boiler electric ignition and smooth burning method are: wind coal dust intermixture is behind the coaxial wind jet pipe of burner that is provided with the hollow electric heating tube in its center, be divided into two strands of breeze airflows of size, adopt electric heating tube to light one-level low discharge coal dust torch, near the big flow breeze airflow of secondary lighting thus then.Pulverized-coal fired boiler electric ignition and smooth combustion apparatus have the hollow electric heating tube that is installed on a wind combustor jet pipe center, be provided with insulation material at the pipe outer wall, at the insulation material skin is coaxial secondary breeze airflow airduct, the electrical power of electric heating tube is regulated control by automatic control set for adjusting, the hollow electric heating tube, adiabator layer is by stent support.
Advantage of the present invention: (1) is igniter, is again main burner; (2) realized that coal dust does not have oily multistage reinforcement igniting and smooth combustion; (3) when underload, need not combustion-supporting oily automatic stable burning; (4) speed of ignition is fast, and is simple to operate, and power consumption is low; (5) device is simple, small investment, long service life; (6) the present invention both can be used for large-sized station boiler igniting and steady combustion, also can be used for small and medium-sized industrial coal powder boilers and kiln, and applicability is strong.
Elaborate below in conjunction with accompanying drawing.
Fig. 1 is pulverized-coal fired boiler electric ignition and smooth combustion apparatus I type schematic diagram;
Fig. 2 is pulverized-coal fired boiler electric ignition and smooth combustion apparatus II type schematic diagram.
This method is: wind coal dust intermixture is behind the coaxial wind jet pipe of burner that is provided with the hollow electric heating tube in its center, be divided into several strands of breeze airflows of size, adopt electric heating tube to light one-level low discharge coal dust torch, near the big flow breeze airflow of secondary lighting is thus then lighted successively step by step again.After coal dust is lighted, when boiler during at peak-regulating low-load, according to the furnace temperature situation of change, electric heating tube is connected automatically and is lighted one-level low discharge coal dust torch, with this smooth combustion, or when boiler when load is unstable, according to the furnace temperature situation, automatically regulate the heating power of electric heating tube, reach steady combustion purpose by stablizing one-level low discharge coal dust torch.
This method is at a former wind combustor spout center hollow electric heating tube to be installed, a former wind coal dust intermixture is divided into several strands of breeze airflows of different flow, reach coal dust shunting purpose, the low discharge coal dust intermixture is passed through in pipe, and a large amount of coal dust intermixture passes through near outside pipe.Utilize the electric energy of electric heating tube to light by wind coal dust intermixture of the one-level low discharge in the hollow heating tube, the coal dust torch that utilizes this strand to light is then lighted near the big flow breeze airflow of secondary, can light three grades bigger flow breeze airflows if desired thus, light step by step successively.Ascending reach last stable ignition combustion purpose.After forming steady torch, cut off the heating tube power supply, return to combustion position based on coal dust.The one-level coal dust amount of lighting with electric energy can reach 300kg/h, and the enlargement ratio from one-level coal dust amount to secondary coal dust amount can reach 15～30 times, as long as adopt the secondary transmission, just can light 6.3 T/H coal dusts and reach smooth combustion like this.Need amplifying in what and the first order air-flow the visual ature of coal situation of coal powder density and boiler form determines.So final realization non-oil ignition with less cost, has been realized the reinforcement igniting and steady combustion of big capacity coal powder burner extremely easily, does not consume any oil or gas, and particularly under the relatively poor situation of ature of coal, effect is more remarkable.Simultaneously the method for available change electrical heating power adapts to the variation of exerting oneself of the variation of coal and burner, uses high-quality bituminous coal as boiler, and then available less electrical power can satisfy the igniting requirement; As use anthracite for boiler, then need more high-power than difficult to burn.
In addition, for the ease of at low-load combustion-stabilizing, igniter adopts regulates control automatically, and promptly boiler is when peak-regulating low-load, according to the furnace temperature situation of change, electrical heating elements is connected automatically, lights hollow heating tube shallow bid breeze airflow, this smooth combustion apparatus drops into automatically, need not throw oil, can smooth combustion.Simultaneously, in the boiler load instability, often under the change condition, the igniting self-checking device can change and steady combustion needs according to boiler load, regulates electrical heating power automatically, stablizes wind coal dust torch one time, need not reach steady combustion purpose by oil, have very strong load performance.This device can combine with coal powder light-dark separation device, lights the dense phase pulverized coal air-flow with electric energy, lights the dilute phase breeze airflow with the dense phase pulverized coal torch again.
This device has hollow electric heating tube 1, be provided with anti-slag sleeve pipe 2 in hollow electric heating tube inside, adjacent hollow electric heating tube be the anti-slag airduct 3 of interlayer, between anti-slag airduct of interlayer and hollow electric heating tube, one deck adiabator layer 4 is arranged, at anti-slag airduct of interlayer and insulation material outside is secondary breeze airflow airduct 5, secondary air flow airduct outside can be arranged breeze airflow airduct more than three grades or three grades as required, and breeze airflow airducts at different levels can be provided with breeze airflow airduct inlet tube separately.Heating power supply adopts electrical heating elements, and its material can be selected the electric heating tube of band microcellular structure, carborunbum tube, stainless steel etc. for use.In order to prevent the heating tube slagging scorification, utilize interlayer gentle breeze to pass the element microcellular structure, form air film at the heating tube inwall.Promptly protect heating tube, prevent slagging scorification, can regulate temperature and ignition location in the heating tube again as required, the visual concrete condition of the anti-slag airduct of interlayer changes the airduct size, even cancellation.The anti-slag sleeve pipe of heating tube inside have the band microcellular structure with two kinds not with holes, visual ature of coal clinkering property and interlayer wind deployment scenarios are determined.Hollow heating tube and heat-insulation layer etc. are by support 6 supportings.Automatically regulate control 7 with igniting and adapt to boiler loads and change, particularly during peak-regulating low-load, can drop into smooth combustion apparatus as required automatically, and not need to throw oil.
Claims (4)
1. pulverized-coal fired boiler electric ignition and smooth burning method, it is characterized in that the wind coal dust intermixture one time, behind the coaxial wind jet pipe of burner that is provided with the hollow electric heating tube in its center, be divided into two strands of breeze airflows of size, adopt electric heating tube to light one-level low discharge coal dust torch, near the big flow breeze airflow of secondary lighting thus then.
2. a kind of pulverized-coal fired boiler electric ignition according to claim 1 and smooth burning method is characterized in that said secondary pulverized coal flow is 15～30 times of one-level pulverized coal flow.
3. pulverized-coal fired boiler electric ignition and smooth combustion apparatus according to the design of the method for claim 1, it is characterized in that it has the hollow electric heating tube [1] that is installed on a wind combustor jet pipe center, be provided with insulation material [4] at the pipe outer wall, at the insulation material skin is coaxial secondary breeze airflow airduct [5], the electrical power of hollow electric heating tube is regulated control by automatic control set for adjusting [7], the hollow electric heating tube, adiabator layer supports by support [6].
4. a kind of pulverized-coal fired boiler electric ignition according to claim 3 and smooth combustion apparatus is characterized in that said hollow electric heating tube inwall is provided with anti-slag sleeve pipe [2], are provided with the anti-slag airduct [3] of interlayer between anti-slag sleeve outer wall and hollow electric heating tube inwall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120983 CN1056684C (en) | 1993-12-18 | 1993-12-18 | Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120983 CN1056684C (en) | 1993-12-18 | 1993-12-18 | Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1093787A CN1093787A (en) | 1994-10-19 |
| CN1056684C true CN1056684C (en) | 2000-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93120983 Expired - Fee Related CN1056684C (en) | 1993-12-18 | 1993-12-18 | Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and apparatus thereof |
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| CN (1) | CN1056684C (en) |
Families Citing this family (2)
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| CN108183495A (en) * | 2017-12-28 | 2018-06-19 | 赫普科技发展（北京）有限公司 | A kind of system of boiler oxygen-enriched combusting combination electrolytic hydrogen production peak-frequency regulation equipment |
| CN112484021B (en) * | 2020-10-23 | 2021-11-19 | 西安交通大学 | Ultralow-load stable-combustion pre-pyrolysis combustion system and ultralow-load operation method |
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1993
- 1993-12-18 CN CN 93120983 patent/CN1056684C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1093787A (en) | 1994-10-19 |
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