CN2420502Y

CN2420502Y - Burner device for gas fuel reformed from coal burning layered boiler

Info

Publication number: CN2420502Y
Application number: CN 00234484
Authority: CN
Inventors: 熊天渝; 熊天渠
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-05-11
Filing date: 2000-05-11
Publication date: 2001-02-21
Anticipated expiration: 2010-05-11

Abstract

The utility model discloses a device provided with a gas burner in a layered burning boiler. The structure of the original layered burning boiler burning solid fuel is not changed; gas burners having unequal amount are arranged on a fire grate, and the appearance of the gas burners is in a square shape; the middle part of an inner air passage is provided with a throat opening, and the upper part and the lower part are both in an inside and outside extended trumpet shape; a fuel spout is arranged in the middle of each burner; the right angle edges of four adjacent burners are respectively provided with arc-shaped nicks of 90 DEG so as to install a secondary air spout. Refitted in this way, the utility model has the advantages of small refit workload, stable flame, even distribution and high burning efficiency; when coal needs to be continuously burnt, a window hole is opened and the gas burners and pipelines can be conveniently taken out.

Description

Coal burning layered boiler changes the burner apparatus that burns gaseous fuel

The utility model relates to a kind of burner, particularly relates to a kind of former fire coal or other solid-fuelled grate firing boiler and changes the burner apparatus that burns gaseous fuel.

The Industrial Boiler face of China is wide in a large number.According to statistics, surplus the coal-burned industrial boiler of China has 40 approximately ten thousand, about 700,000 steam ton, wherein all are grate firing boiler basically, patterns such as its combustion system such as chain furnace, handwarmer, a mechanical blast table spreader stove and vibrating-grate stoker.These boiler structures are more outmoded, and efficiency of combustion is low, and labour intensity is big, a large amount of dust of discharge and sulfur dioxide (SO ₂) and nitrogen oxide sour gas such as (NOx), environmental pollution is serious.In order to reduce pollutant emission, be necessary these boilers are carried out the transformation of fuel structure, be about to the coal-fired gaseous fuel that changes combustion cleaning into.Conventional remodeling method is that the grate firing fire grate is removed, and installs gas burner additional on the front wall of combustion chamber or side wall, and its fire grate bottom air supplied pipeline also must change its course again, makes it supporting with this burner, repacking according to said method, and there are the following problems:

1. it is big to tear down and reconstruct workload, the expense height, and the engineering time is long;

2. destroy the overall structure of combustion chamber, influenced original combustion conditions and heat-transfer character;

3. must install special-purpose gas burner additional, dependence on import has increased improvement expenses greatly basically;

4. in a single day repack gas fired-boiler into, coal or other solid fuel just can not reburn;

5. be contained in the formed pencil flame of gaseous fuel burners on front wall or the side wall, different fully with the formed plane of buring solid fuel stratiform flame on the former grate firing fire grate, thereby changed original dynamic combustion operating mode, directly influenced the heat-transfer effect of original heating surface.

For above-mentioned reasons, though country has proposed strict demand to " coal changes gas ", this work progress is slow.

At above-mentioned situation, the purpose of this utility model is to provide a kind of like this coal-burned industrial boiler to change the gas combustion apparatus that burns gas fired-boiler, original overall structure is constant, only on the fire grate of original boiler, load onto the gas combustion apparatus, comprise corresponding fuel manifold, be in charge of, main flame jet pipe, auxiliary air jet pipe, igniter etc., can guarantee normally and expeditiously burning gases fuel, when baking fluid fuel, only gaseous fuel burners is extracted out with corresponding pipeline and can be recovered former grate firing state in case need to switch fuel.

For achieving the above object, the utility model has been taked following technical measures.

Keep the structure of original boiler and the supply system of combustion air, the quantity of burner is at least more than four, level in length and breadth arranged on fire grate segment top, both can evenly arrange, marginal portion at fire grate also can non-homogeneously arrange, can the original air duct by fire grate of enclosure portion according to the quantity and the position of the layout of burner.The outside of burner is square, and the inner passage is circular and the aditus laryngis of height middle part, edge for shrinking, and is the tubaeform shower nozzle that expands outwardly up and down.The top all is equipped with for dried mushroom shape cover and have the fuel nozzle of fuel jet orifice in the centre of each burner, forms main flame on burner top.One of them main flame expands to all burners after being lighted by igniter.The burner at the edge adjacent with two burners, its adjacent angular is along highly having 90 ° of arc notch, the burner adjacent with three burners then has two jiaos to have 90 ° of arc notch, thereby is that four middle part burners that burner surrounded all have 90 ° of arc notch for its four jiaos.By four 90 ° of arc notch, a circular space place of formation is equipped with the auxiliary air jet pipe that top has the auxiliary air spray orifice all around.The bottom of this air lance places on the fire grate, and the air spray orifice all is higher than the burner top, makes the air of ejection in time offer main flame.The bottom of fuel nozzle is in charge of with fuel and is communicated, and communicates and be in charge of with fuel manifold, and air is infeeded by the fire grate bottom.Have a furnace wall hole to be opened/closed at the rear portion of former grate furnace combustion chamber, can easily whole gas burner be split out, recover former grate firing fire grate structure.

Major advantage of the present utility model is:

1. the structure of original grate furnace is motionless substantially, need not remove fire grate, changes the air channel, furnace wall and the boiler tube of setting up, and the transformation amount is little, and the duration is short;

2. solid fuel is changed the burning gaseous fuel, eliminated the exhaust emission of dust and sulfur dioxide, the discharging of nitrogen oxide (NOx) can reduce more than 80%, makes it to become a kind of combustion apparatus of cleaning;

3. need not burrow and change the gas burner that boiler tube goes to install expensive routine on furnace wall, only burner be placed on the fire grate, corresponding installation fuel conduit can put into operation, and improvement expenses significantly reduces;

4. after fuel penetrates from spray orifice, promptly meet and mixes strongly, then upwards strengthened mixing, and form main flame, flameholding, even at tubaeform shower nozzle place through aditus laryngis with air by fire grate hole ejection;

5. owing to the auxiliary air jet pipe that has adopted between each burner master flame, main flame combustion intensity is increased, burning is complete more, stable;

6. when needs burn away solid fuel, open fenestra and can easily burner and system thereof be removed from fire grate, restore to the original state.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the grate firing boiler burner hearth part elevational cross-sectional view that has gas burner;

Fig. 2 removes the A of parts such as furnace wall, boiler tube to view among Fig. 1.

Shown in Fig. 1-2, the boiler tube 1 among the figure, furnace wall 2, fire grate segment 7, enter the parts that air 6 in the stove and slag-proofing box 9 are original boiler.Main design of the present utility model promptly is to have installed the gas burner 8 more than four additional on the top of the fire grate segment 7 at former boiler furnace place, and level arranged in length and breadth.The profile of burner 8 is square, the inner passage is along the aditus laryngis 12 of middle part for shrinking of height, the top and the bottom dried mushroom shape cover of passage also has the fuel nozzle 3 of fuel jet orifice 4 downwards, igniter 17 is equipped with on the top of a burner therein, described burner 8 and two burners be adjacent to be positioned at of edge and to have 90 ° of arc notch along height one angle, and two jiaos of the burner adjacent with three burners have 90 ° of arc notch, and be that the burner of four middle parts that burner surrounded all has 90 ° of arc notch for its four jiaos, be convenient to around this installation top, arc notch place, have the auxiliary air jet pipe 16 of auxiliary air spray orifice 14, the bottom of described jet pipe 16 places on the fire grate segment 7, the height of its auxiliary air spray orifice 14 exceeds the top of burner 8, the bottom of fuel nozzle 3 is in charge of 5 with fuel and is communicated, and be in charge of 5 and be arranged in the outer fuel manifold 10 of stove and communicate, air 6 is blasted by air blast from the slit of fire grate segment 7, as the combustion air source of primary air and auxiliary air.

In service, fuel penetrates from a plurality of fuel jet orifices 4, mixes with the air that blasts the burner tapering trumpet-like passage by fire grate, the igniter 17 that is installed in a burner top is lighted the main flame 15 of formation, then, the contiguous main flame of this main flame ignition, whole main flames are lighted in expansion rapidly.Auxiliary air penetrates from higher position, has strengthened the stability and the completing combustion of main flame.Arranging on the fire grate that the flame that this mode of burner is produced can make degree of filling height in burner hearth, similar to the original solid fuel grate firing formed plane flame that burns, the heat-transfer effect of original heating surface is given full play to.

Have installation fenestra 11 at original furnace wall one place, be convenient to assemble and remove.

Below only lifting the chain grate furnace is example, and the handwarmer of other grate firing combustion system, machinery-blast table spreader stove, vibration stove grate furnace etc. all can be transformed by above-mentioned design, all should belong within the design of the present utility model and protect.

Claims

The device of gas burner is housed in a kind of grate firing boiler, main grate furnace screening (7) by the bottom, furnace wall all around (2), boiler tube (1), the slag-proofing box of one side (9) and place the gas burner (8) of middle part to form, it is characterized in that: at least four above burners (8) level is arranged in the top of fire grate segment (7) in length and breadth, the outside of burner (8) is square, the inner passage is along the aditus laryngis (12) of middle part for shrinking of height, be the round speaker shape shower nozzle (13) that expands outwardly up and down, fuel jet orifice (4) are covered and had at the top for dried mushroom shape fuel nozzle (3) all is equipped with at the bottom centre position of each burner (8), igniter (17) is equipped with on the top of a burner therein, described burner (8) is adjacent with two burners is positioned at of edge and has 90 ° of arc notch along height one angle, and two jiaos of the burner adjacent with three burners have 90 ° of arc notch, and be that the burner of four middle parts that burner surrounded all has 90 ° of arc notch for its four jiaos, be convenient to around this installation top, arc notch place, have the auxiliary air jet pipe (16) of auxiliary air spray orifice (14), the bottom of described jet pipe 16 places on the fire grate segment (7), it highly exceeds the top of burner (8), the bottom of fuel nozzle (3) is in charge of (5) and is communicated with fuel, communicate and be in charge of (5) and be arranged in the outer fuel manifold (10) of stove, air (6) is blasted by air blast from the slit of fire grate segment (7), as the combustion air source of primary air and auxiliary air.