CN2630658Y

CN2630658Y - Microoil cold-ignition and superlow-load stable-burning combustor

Info

Publication number: CN2630658Y
Application number: CN 03255982
Authority: CN
Inventors: 傅宁娟
Original assignee: HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd
Current assignee: HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd
Priority date: 2003-07-22
Filing date: 2003-07-22
Publication date: 2004-08-04
Anticipated expiration: 2013-07-22

Abstract

The utility model discloses a burner with functions of micro-oil cool state ignition and ultra low loading stable burning. The oil burner is weld on one end of an oil burning chamber installed in a secondary air inlet tube, and the other end is successively connected with a plurality of progressively amplified breeze burning chambers mounted in the secondary air inlet tube, the circular seam space kept between the breeze burning chambers. The outlet of a breeze concentrator arranged in a breeze transport pipeline is split into over two breeze transport pipelines respectively communicated with the breeze burning chambers. The burner ignites the oil with a low-power oil burner, and the oil is burned in the oil burning chamber in which the breeze pipelines are shot at a certain angle. The first-stage breeze after condensation has a low flow capacity but has a high concentration; the amount of the breeze sent in afterward is gradually enlarged. Thus, a small quantity of oil can be used to ignite a good deal of breeze. The secondary air enters a coal burning chamber through the circular seam from the circumference of the breeze burning chambers, forms high velocity air nearby the wall surface of the coal burning chamber to prevent breeze from fouling, cools down the wall surface of the burning chamber, and complements the requisite oxygen for breeze burning. The burner saves the fuel by more than 90 %, and has the characteristics of fast ignition speed, high reliability, no fouling and large ignition output.

Description

Cold state ignition under tiny oil and steady burning burner in ultra low load

Affiliated technical field

The utility model relates to burner, relates in particular to a kind of cold state ignition under tiny oil and steady burning burner in ultra low load.

Background technology

Large-sized station boiler igniting and low-load combustion-stabilizing are huge with oil mass, the about 50-70 ton of the every black furnace kindling one less important consumption of a 200MW boiler oil, and a 300MW boiler need consume 80-100 ton oil approximately, and a 600MW boiler need consume 200-250 ton oil approximately.Have statistics to show, annual boiler kindling igniting needs ten thousand tons of fuel oils of 150-180 approximately, amounts to RMB 45-54 hundred million yuan.Help aspect the fuel oil at underload, along with net capacity strengthens, the aggravation of electrical network peak-valley difference, at night the low power consumption period, many units are moving under underload and ultra-low load state, though development along with combustion technology, many units can not thrown the steady combustion of oil through after the burner reconstruction when 50-60% loads, but when ultra-low load (30-50%) moves, must come into operation and help fuel oil, combustion-supporting huge with oil mass.

Oil is the rare strategic resource of China, the Department of Resources Conservation and Comprehensive Utilization of State Economic and Trade Commission writes in " saving and the 10th Five-Year Plan of alternative fuel oil ": saving and alternative fuel oil are to solve the China's oil shortage of resources, alleviate contradiction between oil supply and demand, ensure the great strategic measure of economic security of the country.During "the 10th five-years", 7,550,000 tons of the targets of power industry saving and alternative fuel oil, non-oil ignition technology and low oily pulverized coal ignition technology promptly are that economic and commercial committee encourages one of project of developing and promoting.

The domestic plasma non-oil ignition technology of having succeeded in developing, this technology is applied on large-sized station boiler.This technology can realize non-oil ignition, but also has problems such as system complex, cost height.

Few-oil ignition technology (in a wind, adding small oil gun), because its oil-saving effect better (look boiler capacity, the small oil gun amount of fuel is 200-300kg/h), equipment investment is few, the reliability height has obtained using very widely on boiler.But there is following deficiency in this technology: the igniting of (1) small oil gun can't be used when the boiler black furnace starts; (2) the small oil gun igniting still can't solve when boiler startup, and electrostatic precipitator problems comes into operation; When (3) boiler moves under the ultra-low load situation, the steady combustion scarce capacity of small oil gun.

Summary of the invention

The purpose of this utility model provides a kind of cold state ignition under tiny oil and steady burning burner in ultra low load, and it utilizes micro-fuel oil direct firing coal-dust under the black furnace state, saves large-sized station boiler and rises furnace oil, and have the combustion apparatus of ultra-low load steady combustion ability.It utilizes the energy level amplification principle, uses a spot of fuel oil, lights the high concentration pulverized coal after concentrating earlier, and the coal dust after catching fire removes to light the second level, third level coal dust again, reaches with a spot of oil drop and fires a large amount of coal dusts.

In order to achieve the above object, the technical solution adopted in the utility model is that it comprises: the conveyance conduit of little oil burner, coal dust, oil combustion chamber, pulverized coal concentrator, a plurality of pulverized coal combustor, secondary wind inlet pipe; Oil burner is welded on an end of the oil combustion chamber in the secondary wind inleting tube of packing into, the other end of oil combustion chamber successively be contained in secondary wind inleting tube in a plurality of pulverized coal combustors that amplify step by step connect, adjacent two pulverized coal combustor two ends screw attachment, and retaining ring gap space, in the conveyance conduit of coal dust pulverized coal concentrator is housed, the pulverized coal concentrator outlet is divided into the power transportation pipe more than 2, respectively with pulverized coal combustor UNICOM.

The utility model is compared with background technology, and the useful effect that has is:

1) with the oil (50-100kg/h) of trace, by the energy level amplification principle, light a large amount of coal dust (1-3t/h), reach boiler black furnace tiny-oil ignition purpose, rate of economizing gasoline can reach more than 90%;

2) speed of ignition is fast, little slagging scorification, can be under the black furnace situation direct firing coal-dust, have ultra-low load steady combustion ability, have underload and ultra-low load steady combustion function;

3) electric precipitation that after ignition of the boiler, promptly can come into operation, environment protecting is good;

4) tiny-oil ignition system reliability height;

5) the tiny-oil ignition cost of investment is low, has the market competitiveness, accepts for market easily.

Description of drawings

Fig. 1 is a structural principle schematic diagram of the present utility model;

Fig. 2 is the A-A cutaway view of the utility model Fig. 1.

The specific embodiment

As shown in Figure 1 and Figure 2, it comprises: the conveyance conduit 2 of little oil burner 1, coal dust, oil combustion chamber 3, pulverized coal concentrator 4, a plurality of pulverized coal combustor 5, secondary wind inlet pipe 6; Oil burner 1 is welded on an end of the oil combustion chamber 3 in the secondary wind inleting tube 6 of packing into, the other end of oil combustion chamber 3 successively be contained in secondary wind inleting tube 6 in a plurality of pulverized coal combustors 5 that amplify step by step connect, adjacent two pulverized coal combustor 5 two ends connect with screw 7, and retaining ring gap space, in the conveyance conduit 2 of coal dust pulverized coal concentrator 4 is housed, pulverized coal concentrator 4 outlets are divided into the power transportation pipe more than 2, respectively with pulverized coal combustor 5 UNICOMs.

Pulverized coal concentrator 4 outlets are divided into 2～3 (level) power transportation pipes.A plurality of pulverized coal combustors 5 are 3～5.

As shown in Figure 1, a kind of micro-fuel oil direct burner of firing coal-dust and ultra-low load steady combustion under the black furnace state that utilizes, it is mainly by small-power oil burner 1, the multistage vertically conveyance conduit 2 of sending into coal dust, oil combustion chamber 3, pulverized coal concentrator 4, a plurality of pulverized coal combustors 5, secondary wind inlet pipe 6 is formed.Connect by welding manner with upper-part, pass through screw attachment between adjacent two pulverized coal combustors 5.At first open secondary wind inlet pipe 6 when starting ignition, combustion chamber wall surface is protected, light small-power oil burner 1 then, oil is 3 internal combustion in the combustion chamber, produce the very high torch of temperature thus and enter in the pulverized coal combustor 5.Utilize pulverized coal channel 2 pulverized coal conveyings, coal dust divides the 2-3 level to send into pulverized coal combustor 5.For inflammable coal dusts such as bituminous coal, coal dust divides 2 grades to send into pulverized coal combustor 5, for unburnable coals such as meager coal and anthracites, coal dust divides 3 grades to send into pulverized coal combustor 5, powder-feeding amount is regulated by the machine supplying powder rotating speed, in order to improve wind concentration of the first order, in the conveyance conduit 2 of coal dust, adopt pulverized coal concentrator 4.Test shows: secondary is sent into mode, first order coal dust amount 20-30%, second level coal dust amount 80-70%; Send into mode to 3 grades, first order coal dust amount 10-20%, second level coal dust amount 20-30%, third level coal dust amount 50-60% can obtain good igniting effect under this automatic powder feeding system.When pulverized coal combustor 5 because coal dust firing and temperature when very high, by the barrel overtemperature that prevents to burn of the control to secondary air flow.Take the coal dust classification to send into and Pulverized Coal Concentration, utilize the oil drop combustion first order coal dust of trace, the heat that utilizes coal dust self to send then amplifies step by step, reaches the purpose that micro oil is lighted a large amount of coal dusts.Enter the secondary wind of combustion chamber by multistage circumferential weld, not only have the effect that the combustion barrel outer wall is cooled off, and play and replenish coal dust firing requisite oxygen amount, prevent the effect of slagging scorification.Be about 50% by the coal dust lighted in combustion chamber internal combustion rate, burn away after spraying in the stove, provide the boiler kindling needed heat.The rate of economizing gasoline of present technique can reach more than 90%.

Claims

1. cold state ignition under tiny oil and steady burning burner in ultra low load is characterized in that it comprises: the conveyance conduit (2) of little oil burner (1), coal dust, oil combustion chamber (3), pulverized coal concentrator (4), a plurality of pulverized coal combustor (5), secondary wind inlet pipe (6); Oil burner (1) is welded on an end of the oil combustion chamber (3) in the secondary wind inleting tube of packing into (6), interior with being contained in secondary wind inleting tube (6) the successively a plurality of pulverized coal combustors (5) that amplify step by step of the other end of oil combustion chamber (3) connect, adjacent two pulverized coal combustors (5) two ends connect with screw (7), and retaining ring gap space, pulverized coal concentrator (4) is housed in the conveyance conduit of coal dust (2), pulverized coal concentrator (4) outlet is divided into the power transportation pipe more than 2, respectively with pulverized coal combustor (5) UNICOM.

2. a kind of cold state ignition under tiny oil according to claim 1 and steady burning burner in ultra low load is characterized in that: said pulverized coal concentrator (4) outlet is divided into 2～3 power transportation pipes.

3. a kind of cold state ignition under tiny oil according to claim 1 and steady burning burner in ultra low load is characterized in that: said a plurality of pulverized coal combustors (5) are 3～5.