CN1093787A - Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and device - Google Patents
Pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and device Download PDFInfo
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- CN1093787A CN1093787A CN 93120983 CN93120983A CN1093787A CN 1093787 A CN1093787 A CN 1093787A CN 93120983 CN93120983 CN 93120983 CN 93120983 A CN93120983 A CN 93120983A CN 1093787 A CN1093787 A CN 1093787A
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Abstract
The invention discloses a kind of pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and device, it is to utilize the center electric heating tube (rod) that is installed in the former wind combustor jet pipe, light one-level low discharge coal dust torch, then, near the big flow breeze airflow of secondary lighting thus, light step by step successively again, after coal dust is lighted, when boiler when peak-regulating low-load or load are unstable, automatically connect according to furnace temperature situation of change electric heating tube (rod), or regulate the heating power of electric heating tube (rod) automatically, reach steady combustion purpose.Advantage of the present invention is to be igniter, is again burner, and speed of ignition is fast, and is simple to operate, and power consumption is low, has realized that coal dust does not have oily multistage reinforcement igniting and smooth combustion.
Description
The present invention relates to pulverized coal boiler ignition and low-load combustion-stabilizing method and device, especially relate to pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and device.
Burner is the key equipment of boiler, is the organizer of fuel stable ignition burning, and therefore, the performance quality of burner can directly have influence on the security and the economy of boiler operatiopn.China has a large capacity and a wide range at present, the maximum thermal power plant's pulverized-coal fired boiler of consume fuel 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, this method of operation can satisfy safe operation of the boiler, but needs to consume a large amount of fuel oil, or even the 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-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method and device.
Elaborate below in conjunction with accompanying drawing.
Fig. 1 is pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning device I type schematic diagram;
Fig. 2 is pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning device II type schematic diagram.
This method is: several strands of breeze airflows that wind coal dust intermixture are divided into the flow that varies in size, or adopt light-dark separation device to be divided into several strands of different breeze airflows of deep or light flow to enter successively respectively breeze airflow airducts at different levels, and utilize the center electric heating tube (rod) that is installed in the former wind combustor jet pipe to light one-level low discharge coal dust torch, then, near the big flow breeze airflow of secondary lighting is thus 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 (rod) is automatically connected 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 (rod), reach steady combustion purpose by stablizing one-level low discharge coal dust torch.
This method is at a former wind combustor spout mounting center electric heating tube (rod), a former wind coal dust intermixture is divided into several strands of breeze airflows of different flow or utilizes light-dark separation device to reach coal dust shunting purpose, the low discharge coal dust intermixture is passed through in pipe, and a large amount of coal dust intermixture pass through near outside pipe. Utilize the electric energy of center electric heating tube to light by wind coal dust intermixture of the one-level low discharge in the central heating tube, the coal dust torch that utilizes then this strand to light is lighted near the big flow breeze airflow of secondary, if need to light thus three grades bigger flow breeze airflows, light step by step successively. Ascendingly reach the combustion of last stable ignition Burn purpose. After forming steady torch, cut off the heating tube power supply, return to take coal dust to main combustion position. The one-level coal dust gas and oil 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 the 6.3T/H coal dust 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 littler 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 in 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 such as boiler, and then available littler electrical power can satisfy the igniting requirement; As use the anthracite than difficult to burn for boiler, then need relatively high power.
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 central 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 is to have center electric heating tube (rod) 1, be provided with anti-slag sleeve pipe 2 in central tube inside, adjacent central tube be the anti-slag airduct 3 of interlayer, one deck adiabator layer 4 is arranged between interlayer airduct and central tube, 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.' electrical heating elements is adopted in the source, and its material can be selected the electric heating tube of band microcellular structure, carborunbum tube (rod), stainless steel etc. for use in heating.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.Central 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.
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.
Claims (7)
1, a kind of pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning method, it is characterized in that wind coal dust intermixture is divided into several strands of breeze airflows of the flow that varies in size, or adopt light-dark separation device to be divided into several strands of different breeze airflows of deep or light flow to enter breeze airflow airducts at different levels respectively successively, and utilize the center electric heating tube (rod) that is installed in the former wind combustor jet pipe to light one-level low discharge coal dust torch, then, near the big flow breeze airflow of secondary lighting is thus lighted successively step by step again; After coal dust was lighted, when boiler during at peak-regulating low-load, according to the furnace temperature situation of change, electric heating tube (rod) was connected automatically, lights one-level low discharge coal dust torch, with this smooth combustion; Or when boiler when load is unstable, according to the furnace temperature situation of change, regulate the heating power of electric heating tube (rod) automatically, reach steady combustion purpose by stablizing one-level low discharge coal dust torch.
2, a kind of pulverized-fuel boiler oil-less step electric igniting according to claim 1 and peak-regulating low-load automatic stable burning method is characterized in that said secondary coal dust is 15～30 times of one-level coal dust.
3, a kind of designed according to the method described above pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning device, it is characterized in that it has the center electric heating tube (rod) [1] that is installed on a wind combustor jet pipe, adiabator layer [4], secondary breeze airflow airduct [5], automatic control set for adjusting [7], center electric heating tube (rod), adiabator layer is supported by support [6].
4, a kind of pulverized-fuel boiler oil-less step electric igniting and the peak-regulating low-load automatic stable burning device of design according to the method described above according to claim 3, it is characterized in that being respectively equipped with anti-slag sleeve pipe [2] inside and outside the electric heating tube of said center, interlayer is prevented slag airduct [3].
5, according to claim 3 or 4 described a kind of designed according to the method described above pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning devices, it is characterized in that said breeze airflow airduct is more than three grades or three grades.
6,, it is characterized in that the electric heating tube of said center electric heating tube, carborunbum tube for the band microcellular structure according to claim 3 or 4 described a kind of designed according to the method described above pulverized-fuel boiler oil-less step electric igniting and peak-regulating low-load automatic stable burning devices.
7, according to claim 3 or the 4 described a kind of pulverized-fuel boiler oil-less step electric igniting and the peak-regulating low-load automatic stable burning devices of design according to the method described above, it is characterized in that said breeze airflow airduct at different levels, be respectively equipped with breeze airflow airduct inlet tube separately.
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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN1093787A true CN1093787A (en) | 1994-10-19 |
| CN1056684C CN1056684C (en) | 2000-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112484021A (en) * | 2020-10-23 | 2021-03-12 | 西安交通大学 | Ultralow-load stable-combustion pre-pyrolysis combustion system and ultralow-load operation method |
-
1993
- 1993-12-18 CN CN 93120983 patent/CN1056684C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112484021A (en) * | 2020-10-23 | 2021-03-12 | 西安交通大学 | Ultralow-load stable-combustion pre-pyrolysis combustion system and ultralow-load operation method |
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| Publication number | Publication date |
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| CN1056684C (en) | 2000-09-20 |
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