CN207865374U - The recirculating fluidized bed of low CO discharge - Google Patents

Abstract

The utility model provides a kind of recirculating fluidized bed of low CO discharge, including burner hearth, overfire air port, circulating ash separator and flue, the flue gas that circulating ash separator is isolated is discharged by flue, there is at least two layers of overfire air port on the burner hearth, it is characterised in that：Further include Oxidation of Carbon Monoxide device and internal combustion burner, Oxidation of Carbon Monoxide device is mounted in the flue of exhaust pipe or rear end flue-gas temperature higher than 650 DEG C of circulating ash separator；The Oxidation of Carbon Monoxide device includes oxygen spout, and Oxidation of Carbon Monoxide device carries out spray oxygen by oxygen spout to flue gas, and internal combustion burner is mounted on burner hearth.The utility model, which can allow, to be reduced burner hearth feeding mouth fat coal and mixes burnings, and the main combustion things in burner hearth can be made to carry out completely burned, to reduce the generation of carbon monoxide, and in rear end is using Oxidation of Carbon Monoxide device reduction flue gas carbon monoxide content.

Description

The recirculating fluidized bed of low CO discharge

Technical field

The utility model belongs to energy conservation and environmental protection field, more particularly to a kind of recirculating fluidized bed of low CO discharge.

Background technology

In recent years, to implement《Law of Environmental Protection of the People's Republic of China》、《People's Republic of China's prevention and control of air pollution Method》, it is nationwide in emission control all in reinforcement to boiler atmosphere pollution, wherein CO emission is atmosphere pollution An important indicator in object discharge standard.Carbon monoxide is mostly caused by fuel combustion is insufficient, and direct purification carbon monoxide lacks Weary practical technique is mostly set about from raising efficiency of combustion, to reduce the generation of carbon monoxide.Therefore in combustions such as boiler, industrial furnace cellars for storing things It burns in the discharging standards of equipment and defines flue gas blackness limit value, it is desirable that fuel combustion is abundant, reduces by an oxygen to reach Change the purpose of carbon emission.

In traditional recirculating fluidized bed, in order to ensure generating efficiency, in order to reduce the generation of bioxin, stove is generally required Temperature is maintained at higher temperature in thorax, and the generally main combustion things of recirculating fluidized bed are all the extremely low rubbish of calorific value or bone coal etc..Institute When completely burned enough with the air distribution being passed through, temperature will be unable to reach higher temperature；The enough air distributions not being passed through, and it can be made Imperfect combustion.Recirculating fluidized bed is caused to generate a large amount of carbon monoxide.Heat smoke after hearth combustion enters circulating ash separator, After separation, dust is flow back to from lower part dust exhausting hole in burner hearth, and flue gas forms the inward eddy risen and is discharged to by exhaust pipe Among flue.And this flue gas containing CO content can hundreds of even thousands of every cubic metre of milligrams, this will cause environment Greatly pollution, it is therefore desirable to find a kind of recirculating fluidized bed reducing carbon monoxide emission.

Utility model content

In view of the above deficiencies of the prior art, the purpose of this utility model is to provide one kind can guarantee Boiler Furnace Effect, and the carbon monoxide content recirculating fluidized bed of safe operation reduced in circulating flue gas.

A kind of recirculating fluidized bed of low CO discharge, including burner hearth, overfire air port, circulating ash separator and cigarette Road, the flue gas that circulating ash separator is isolated are discharged by flue, there is at least two layers of overfire air port, feature on the burner hearth It is：Further include Oxidation of Carbon Monoxide device and internal combustion burner, Oxidation of Carbon Monoxide device is mounted on circulating ash separator Exhaust pipe or rear end flue-gas temperature higher than in 650 DEG C of flue；The Oxidation of Carbon Monoxide device includes oxygen spout, and one Carbonoxide oxidation unit carries out spray oxygen by oxygen spout to flue gas, and internal combustion burner is mounted on burner hearth.

Using the above structure, burner hearth is sprayed into after oxidizer is ignited in internal combustion burner, than conventional recycle fluid bed Fire box temperature can more be increased, and it is abundant to burn, and improves Boiler Steam amount, ensure that the enough air distributions of boiler reach design value, avoid stove Interior burning generates carbon monoxide not to the utmost.The flue gas of circulating ash separator discharge passes through Oxidation of Carbon Monoxide device, in the apparatus It comes into full contact with and mixes with oxygen, and be oxidized into carbon dioxide, used carbon monoxide and oxygen at 650 degrees Celsius or more When the principle that can chemically react, so that carbon monoxide is oxidized to carbon dioxide, and then the harmful substance reduced in flue gas contains Amount.

Further, obliquely, another part internal combustion burner spout is horizontal for a part of internal combustion burner spout.

Using the above structure, make temperature in burner hearth slightly asymmetric, form the temperature difference, generate air-flow, overheavy firing.And it can be with Reinforce turbulent extent, keeps time of the air in high temperature longer, reduce the generation of bioxin.

Further, the position of internal combustion burner installation site and lower layer's overfire air port flush or below.

Using the above structure, the main combustion things of recirculating fluidized bed are sprayed onto after the oxidizer burning in internal combustion burner rapidly On, its another fast lifting temperature is simultaneously burnt immediately, and main combustion things burning is more complete, and fire box temperature gets a promotion, and generating efficiency obtains To guarantee.

Further, Oxidation of Carbon Monoxide device carries out from inside to outside and/or the spray of ecto-entad flue gas by oxygen spout Oxygen.

Using the above structure, from inside to outside and/or the spray oxygen of ecto-entad, oxygen can be allowed to spray more uniform.Yu Geng More flue gases carries out hybrid reaction.

Further, the Oxidation of Carbon Monoxide device further includes the oxygen conveying pipe of a longitudinal direction, the oxygen spout It is located on longitudinal oxygen conveying pipe.

Using the above structure, it makes oxygen conveying pipe parallel with flue gas flow direction, oxygen can preferably be allowed to scatter or even shape The face of flue gas circulation is completely covered at air film.

Further, the Oxidation of Carbon Monoxide device further includes the oxygen conveying pipe of at least two longitudinal directions, each Zhi Zong To oxygen conveying pipe on aerobic gas blowout mouth, and all longitudinal oxygen conveying pipes be distributed in flue gas circulation same cross On section.

Using the above structure, the branched particularly suitable flue in irregular shape of longitudinal oxygen conveying pipe, such as four are set Side shape, ellipse etc.；Or be unable to fully cover entire circulating face the case where.These oxygen conveying pipes can be distributed in On each position in cross section, contribute to the mixing of oxygen and flue gas.

Further, Oxidation of Carbon Monoxide device further includes at least one layer of lateral oxygen conveying pipe, and each layer at least wraps Include the oxygen conveying pipe of a transverse direction, aerobic gas blowout mouth on the oxygen conveying pipe of each transverse direction, lateral oxygen is defeated Send pipeline symmetrical or dislocation arrangement.

Using the above structure, allow oxygen conveying pipe and flue gas flow direction vertical, lateral oxygen conveying pipe is more easy to install, Position in flue gas is shorter, so more firm.Multilayer is arranged to be conducive to be sufficiently mixed with flue gas.

Further, the oxygen spout is opened in the end top of oxygen conveying pipe or the surrounding of end outer wall.

Using the above structure, increase the diffusion area and covering surface of oxygen.

Further, the Oxidation of Carbon Monoxide device further includes periphery oxygen supply, which is circumferentially positioned at cigarette On the inside of road wall, it is provided with oxygen spout on the inner wall of the periphery oxygen supply, the oxygen spout is any one in periphery oxygen supply The looping pit opened in a or multiple cross-sectional directions, or open in any one or more cross-sectional directions of periphery oxygen supply equal The through-hole of even distribution.

Using the above structure, the flue gas of periphery is supplied oxygen, sprays oxygen from outside to inside.

Further, the Oxidation of Carbon Monoxide device further includes the oxygen conveying pipe of at least one layer of grid type, each layer Oxygen conveying pipe in be provided with oxygen spout.

Using the above structure, make oxygen area coverage bigger, spray range is wider, is obtained with smoke reaction more abundant.

As described above, the utility model has the beneficial effects that：

Internal combustion burner is arranged in burner hearth can reduce the burning of mixing of burner hearth fat coal, and can make the main combustion in burner hearth Object carries out completely burned, ensures fire box temperature, improves Boiler Steam amount, so that the enough air distributions of boiler is reached design value, avoid in stove Burning generates carbon monoxide not to the utmost.Increase completely new Oxidation of Carbon Monoxide device recirculating fluidized bed circulating ash separator Rear end has carried out oxidation processes to the flue gas after separation, to reduce the discharge of carbon monoxide.It distributed in a device several Oxygen spout, increase the area coverage of oxygen by various structures, allow oxygen being carried out with smoke contacts as possible Reaction.Simple in structure, install convenient is of low cost.

Description of the drawings

Fig. 1 is the structural schematic diagram of the utility model embodiment 1；

Fig. 2 is the structural schematic diagram of the utility model embodiment 2；

Fig. 3 is the structural schematic diagram of the utility model embodiment 2；

Fig. 4 is the partial schematic diagram in the portions B of 2 Fig. 2 of the utility model embodiment；

Fig. 5 is the partial schematic diagram in the portions B of 2 Fig. 2 of the utility model embodiment；

Fig. 6 is the flue cross-sectional view of the utility model embodiment 3；

Fig. 7 is the arrangement schematic diagram of the oxygen conveying pipe of the flue cross section transverse direction of the utility model embodiment 4；

Fig. 8 is the arrangement schematic diagram of the oxygen conveying pipe of the flue cross section transverse direction of the utility model embodiment 4；

Fig. 9 is the structural schematic diagram of the utility model embodiment 5；

Figure 10 is the partial schematic diagram in the portions A of 5 Fig. 9 of the utility model embodiment；

Figure 11 is the oxygen spout arrangement schematic diagram of the utility model embodiment 5；

Figure 12 is the oxygen spout arrangement schematic diagram of the utility model embodiment 5.

Specific implementation mode

Illustrate that the embodiment of the utility model, those skilled in the art can be by these by particular specific embodiment below Content disclosed by specification understands other advantages and effect of the utility model easily.

Embodiment 1

Fig. 1 show the structural schematic diagram of embodiment 1.A kind of recirculating fluidized bed of low CO discharge, including burner hearth 1, overfire air port 12, circulating ash separator 2 and flue 4, the flue gas that circulating ash separator 2 is isolated are discharged by flue 4, institute Stating on burner hearth has at least two layers of overfire air port 12, it is characterised in that：Further include Oxidation of Carbon Monoxide device 3 and internal combustion type burning Device 13, Oxidation of Carbon Monoxide device 3 are mounted on the cigarette of exhaust pipe or rear end flue-gas temperature higher than 650 DEG C of circulating ash separator 2 In road 4；The Oxidation of Carbon Monoxide device 3 includes oxygen spout 6, and Oxidation of Carbon Monoxide device 3 is by oxygen spout 6 to cigarette Gas carries out spray oxygen, and internal combustion burner 13 is mounted on burner hearth.

Oxidizer sprays into burner hearth after being ignited in internal combustion burner 13, can more increase burner hearth than conventional recycle fluid bed Temperature, and it is abundant to burn.Recirculating fluidized bed is usually used in garbage power or coal power generation inferior, due to itself calorific value mistake of these main combustion things It is low, then fat coal can be added in combustion and carry out mixing burning raising temperature；And after having used internal combustion burner 13, so that it may with Greatly reduce the burning of mixing of fat coal, it is even completely eliminated to carry out mixing burning.The dosage for saving fat coal, has saved operating cost. Main combustion things can also carry out completely burned simultaneously, reduce the discharge of carbon monoxide.

The flue gas of circulating ash separator discharge passes through Oxidation of Carbon Monoxide device, come into full contact in the apparatus with oxygen and Mixing, and it is oxidized into carbon dioxide, use carbon monoxide and oxygen that can be chemically reacted at 650 degrees Celsius or more Principle, so that carbon monoxide is oxidized to carbon dioxide, and then reduce the harmful substance contents in flue gas.

The spout of internal combustion burner 13 can all obliquely, can also be all horizontal, can be downward with a part, and one Part of horizontal.It can all allow lower furnace portion burning more abundant downwards, environment is more stablized in burner hearth, and part is downward, part Level can allow temperature in burner hearth slightly asymmetric, form the temperature difference, generate air-flow, overheavy firing.And turbulent extent can be reinforced, Keep time of the air in high temperature longer, reduces the generation of bioxin.

The position of 13 installation site of internal combustion burner and lower layer's overfire air port 12 flush or below.Internal combustion burner It is sprayed onto rapidly in the main combustion things of recirculating fluidized bed after oxidizer burning in 13, its another fast lifting temperature is simultaneously burnt immediately, main Combustion things burning is more complete, and fire box temperature gets a promotion, and generating efficiency is protected.

There are two circulating ash separators 2 for tool in the present embodiment, therefore in the rear end flue of the two circulating ash separators It is equipped with Oxidation of Carbon Monoxide device, it, can be in respective rear end no matter similarly can be to have how many a circulating ash separators Oxidation of Carbon Monoxide device is set in flue in flue, or after merging, as long as its flue meets flue-gas temperature higher than 650 Celsius Spend this condition.And Oxidation of Carbon Monoxide device can also be mounted in the exhaust pipe of circulating ash separator.Circulating ash detaches The flue gas that device 2 is discharged passes through Oxidation of Carbon Monoxide device, comes into full contact with and mixes with oxygen in the apparatus, and is oxidized into Carbon dioxide, the principle for having used carbon monoxide and oxygen that can be chemically reacted at 650 degrees Celsius or more, makes carbon monoxide It is oxidized to carbon dioxide, and then reduces the harmful substance contents in flue gas.

Embodiment 2

Fig. 2,3,4,5 show the structural schematic diagram of embodiment 2.Oxidation of Carbon Monoxide device as shown in Figures 2 and 3, peace In flue mounted in circulating ash separator rear end flue-gas temperature higher than 650 DEG C.Oxidation of Carbon Monoxide device passes through oxygen spout pair Flue gas carries out spray oxygen from inside to outside.Except the oxygen mode of spray from inside to outside in the present embodiment, it is also an option that the side of ecto-entad Formula, or both also carries out spray oxygen from inside to outside while combination i.e. from inside to outside.

The range of oxygen sprinkling is bigger, is more advantageous to flue gas and carries out hybrid reaction.

Oxidation of Carbon Monoxide device further includes the oxygen conveying pipe 5 of a longitudinal direction, the oxygen spout in the present embodiment It is located on longitudinal oxygen conveying pipe 5.Longitudinal direction refers to identical direction with flue gas circulation, refers to laterally tangent with flue gas circulation Direction.

Fig. 4,5 for the portions B in Fig. 2 partial enlarged view, they show the position of oxygen spout.

Oxygen spout in Fig. 4 is opened in the surrounding of the end outer wall of oxygen conveying pipe 5, it can be that looping pit can also It is multiple through-holes, can be arranged on a cross section, can also be arranged in multiple cross-sectional directions, be merely illustrated in Fig. 4 The case where one cross section.Oxygen can be allowed to form the structure of umbrella by the looping pit or through-hole of outside, increase oxygen Diffusion area and covering surface.The oxygen is with the ejection that oxygen conveying pipe 5 is that the center of circle dissipates from inside to outside.

Oxygen spout in Fig. 5 is opened in the end top of oxygen conveying pipe 5.

Embodiment 3

Fig. 6 show the flue cross-sectional view of embodiment 3, and 3 structure of embodiment is substantially the same manner as Example 2, only Oxygen conveying pipe becomes branched by one, and other same part repeats no more.The Oxidation of Carbon Monoxide device further includes The oxygen conveying pipe 5 of at least two longitudinal directions, aerobic gas blowout mouth on the oxygen conveying pipe 5 of each longitudinal direction, and it is all vertical To oxygen conveying pipe 5 be distributed in flue gas circulate same cross section on.It is horizontal that Fig. 6 left figures and right figure respectively illustrate flue 4 The distribution mode that section is rectangle, cross section is Oxidation of Carbon Monoxide device in the case of circular two kinds.Branched longitudinal direction is set The particularly suitable flue 4 in irregular shape of oxygen conveying pipe, such as quadrangle, ellipse etc.；Or one be unable to fully cover The case where covering entire circulating face.These oxygen conveying pipes can be distributed on each position in cross section, contribute to oxygen and cigarette The mixing of gas.Oxygen conveying pipe can be uniformly distributed such as annular spread distributed rectangular, can not also be uniformly distributed on demand.

Embodiment 4

Fig. 7,8 show embodiment 4 flue cross section transverse direction oxygen conveying pipe arrangement schematic diagram, embodiment 4 Middle Oxidation of Carbon Monoxide device further includes at least one layer of lateral oxygen conveying pipe, and each layer includes at least the oxygen of a transverse direction Letter shoot road, aerobic gas blowout mouth on the oxygen conveying pipe of each transverse direction, lateral oxygen conveying pipe are symmetrical or wrong Position arrangement.Fig. 7 is the dislocation arrangement for showing single layer, and Fig. 8 is the symmetry arrangement for showing single layer, and those skilled in the art can also be by This is inferred to the arrangement mode of multilayer, and this will not be repeated here.Make oxygen conveying pipe and flue gas flow direction vertical, the conveying of lateral oxygen Pipeline is more easy to install, and the position in flue gas is shorter, so more firm.Multilayer is arranged to be conducive to be sufficiently mixed with flue gas.

Embodiment 5

Fig. 9,10,11,12 show the structural schematic diagram of embodiment 5, and Oxidation of Carbon Monoxide device further includes week described in Fig. 9 Side oxygen supply 7, the periphery oxygen supply 7 are circumferentially positioned on the inside of walling of flue, and oxygen spray is provided on the inner wall of the periphery oxygen supply 7 Mouth 6, the oxygen spout 6 is the looping pit opened in 7 any one or more cross-sectional directions of periphery oxygen supply, or on periphery The equally distributed through-hole opened in 7 any one or more cross-sectional directions of oxygen supply.Figure 10 is the partial enlargement in the portions A in Fig. 9 Schematic diagram has two layers of oxygen spout in figure, and every layer of trepanning is that diagonally downward, can guide the flow direction of oxygen, is increased With the contact area of flue gas.

Figure 11 is that periphery oxygen supply opens the looping pit schematic diagram in a cross-sectional direction, and Figure 12 is that periphery oxygen supply is opened in Equally distributed through-hole structure schematic diagram in one cross-sectional direction.

Embodiment 6

6 structure of embodiment is substantially the same manner as Example 1, is not repeating, and the present embodiment Oxidation of Carbon Monoxide device further includes The oxygen conveying pipe of at least one layer of grid type is provided with oxygen spout in each layer of oxygen conveying pipe.Oxygen is set to cover Area bigger, spray range is wider, is obtained with smoke reaction more abundant.

Any person skilled in the art all can be under the spirit and scope without prejudice to the utility model, to above-described embodiment Carry out modifications and changes.Therefore, such as those of ordinary skill in the art without departing from disclosed in the utility model Spirit and all equivalent modifications for being completed under technological thought or change, should be contained by the claim of the utility model Lid.

Claims (10)

1. a kind of recirculating fluidized bed of low CO discharge, including burner hearth (1), overfire air port (12), circulating ash separator (2) it is discharged by flue (4) with flue (4), the flue gas that circulating ash separator (2) is isolated, is had at least two layers on the burner hearth Overfire air port (12), it is characterised in that：Further include Oxidation of Carbon Monoxide device (3) and internal combustion burner (13), an oxidation Oxidation of coal device (3) is mounted in the flue (4) of exhaust pipe or rear end flue-gas temperature higher than 650 DEG C of circulating ash separator (2)； The Oxidation of Carbon Monoxide device (3) includes oxygen spout (6), and Oxidation of Carbon Monoxide device (3) is right by oxygen spout (6) Flue gas carries out spray oxygen, and internal combustion burner (13) is mounted on burner hearth.

2. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：A part of internal combustion Obliquely, another part internal combustion burner (13) spout is horizontal for formula burner (13) spout.

3. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The internal combustion type burning The position of device (13) installation site and lower layer's overfire air port (12) flush or below.

4. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide oxygen Makeup is set (3) and is carried out from inside to outside and/or the spray oxygen of ecto-entad to flue gas by oxygen spout (6).

5. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide oxygen The oxygen conveying pipe (5) that (3) further include a longitudinal direction is set in makeup, and the oxygen spout (6) is located at longitudinal oxygen conveying pipe On road (5).

6. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide oxygen Disguise and set the oxygen conveying pipe (5) that (3) further include at least two longitudinal directions, on the oxygen conveying pipe (5) of each longitudinal direction Aerobic gas blowout mouth (6), and all longitudinal oxygen conveying pipes (5) are distributed on the same cross section of flue gas circulation.

7. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide oxygen It further includes at least one layer of lateral oxygen conveying pipe (5) that (3) are set in makeup, and each layer includes at least the oxygen conveying of a transverse direction Pipeline (5), aerobic gas blowout mouth (6) on the oxygen conveying pipe (5) of each transverse direction, lateral oxygen conveying pipe (5) are right Claim or dislocation is arranged.

8. according to the recirculating fluidized bed of any low CO discharges of claim 4-7, it is characterised in that：The oxygen Spout (6) is opened in the end top of oxygen conveying pipe (5) or the surrounding of end outer wall.

9. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide oxygen It further includes periphery oxygen supply (7) that (3) are set in makeup, which is circumferentially positioned on the inside of walling of flue, the periphery oxygen supply Oxygen spout (6) is provided on the inner wall of device (7), the oxygen spout (6) is in periphery oxygen supply (7) any one or more cross The looping pit opened in cross-wise direction, or what is opened in periphery oxygen supply (7) any one or more cross-sectional directions are uniformly distributed Through-hole.

10. the recirculating fluidized bed of low CO discharge according to claim 1, it is characterised in that：The carbon monoxide Oxidation unit (3) further includes the oxygen conveying pipe (5) of at least one layer of grid type, in each layer of oxygen conveying pipe (5) It is provided with oxygen spout (6).