CN207279597U - Evaporator and the circulating fluidized bed boiler with the evaporator - Google Patents

Abstract

It the utility model is related to a kind of evaporator and the circulating fluidized bed boiler with the evaporator, including steam-generating bank and respectively the import header positioned at the steam-generating bank both ends, outlet header, the steam-generating bank includes multigroup evaporation tube, the evaporation tube includes sequentially connected import end pipe, the first spiral fin coil, connecting tube, the second spiral fin coil and outlet end pipe, the other end of the import end pipe is connected with import header, and the other end of the outlet end pipe is connected with outlet header.Evaporator described in the utility model, it is simple in structure, radiating efficiency is high, so that the vapoury water after economizer heating further absorbs heat, improve its steam quality, so as to reduce the flue-gas temperature of economizer import, the heating surface arrangement of economizer and air preheater is reduced, achievees the purpose that to reduce boiler entirety heating surface.

Description

Evaporator and the circulating fluidized bed boiler with the evaporator

Technical field

It the utility model is related to Sector of Cfb Boilers, and in particular to a kind of evaporator and there is the evaporator Circulating fluidized bed boiler.

Background technology

Circulating fluidized bed boiler is studied from the sixties by China, and very fast development is achieved after the nineties, existing Ripe and wide hair application in China is had evolved into circulating fluidized bed boiler.The large circulating fluidized bed boiler in present China Heating surface, be entirely designed by the order of burner hearth → superheater → economizer → air preheater.Long-term reality Operation shows that such design is very suitable to bituminous coal and lignite.But burning anthracite, especially volatile matter is relatively low During high anthracite, because anthracite hardness is big, burning point is high, and anthracite usually can't burn completely in burner hearth, and be to continue with Combustion heat release in superheater, thus causes superheater outlet (i.e. economizer import) flue-gas temperature height.And the suction of economizer Heat requires, and for boiler safety, the boiling rate of stove water cannot be excessive in economizer.When economizer input gas temperature When excessive, because more economizer surfaces cannot be designed, the outlet temperature of economizer also can be higher.It is so remaining Flue gas heat can only be absorbed by air preheater, and since air preheater heat transfer coefficient is low, it is necessary to which arrangement is heated Face will be much larger, causes very big waste.Evaporator is designed (before economizer) after superheater, utilizes the saturation in evaporator Water absorbs excessive flue-gas temperature, for newly-designed boiler, can allow economizer and air preheater according to routine Design, it is not necessary to too many Air Preheater Heating Surface in design, and since the coefficient of heat transfer of evaporator is bigger than air preheater Very much, the heating surface for the evaporator that can so design is relatively small very much, can save boiler manfacturing and installation cost, have Very high economy.For the boiler run, other coals of particularly burning are changed to the anthracitic boiler that burns again, often The problem of high fume temperature occurs, increase air preheater in this boiler without enough spaces, and economizer Heat absorption also reach the design upper limit, being further added by economizer can cause steam quality in economizer to exceed the 20% of design code, influence Safe operation of the boiler, therefore design a kind of evaporator that can reduce economizer input gas temperature and meet above-mentioned requirements and be One of the field urgent problem to be solved.

Utility model content

In view of problems of the prior art, the purpose of this utility model be to provide it is a kind of it is simple in structure, can be efficient Reduce the evaporator of economizer input gas temperature and the circulating fluidized bed boiler with the evaporator.

The purpose of this utility model is to be achieved through the following technical solutions：

A kind of evaporator, including steam-generating bank and respectively positioned at the steam-generating bank both ends import header, outlet collection Case, the steam-generating bank include multigroup evaporation tube, and the evaporation tube includes sequentially connected import end pipe, the first helical fin Pipe, connecting tube, the second spiral fin coil and outlet end pipe, the other end of the import end pipe is connected with import header, described The other end of outlet end pipe is connected with outlet header.

Further, wherein multigroup evaporation tube is to be arranged in order setting.

Further, plurality of first spiral fin coil is is arranged in parallel, and be inclined upwardly and with horizontal plane shape Into angle be >=15 °.

Further, plurality of second spiral fin coil is is arranged in parallel, and be inclined upwardly and with horizontal plane shape Into angle be >=15 °.

Further, the plurality of outlet end pipe is horizontally disposed, and is parallel to each other.

Further, the plurality of import end pipe is horizontally disposed, and is parallel to each other.

Further, the plurality of connecting tube is horizontally disposed, and is parallel to each other.

Further, the plurality of connecting tube is set for arc, and is parallel to each other.

A kind of circulating fluidized bed boiler with evaporator, including burner hearth, superheater, evaporator, the province's coal set gradually Device and air preheater.

Further, water-cooling system is equipped with the burner hearth, and one end of the burner hearth is additionally provided with separator.

The effect of the evaporator is so that the vapoury water after economizer heating further absorbs heat, improves it and contains Vapour rate, so as to reduce the flue-gas temperature of economizer import, reduces the heating surface arrangement of economizer and air preheater, reaches reduction The purpose of boiler entirety heating surface.

The utility model has the advantage that：

1. evaporator provided by the utility model, evaporator tube bank can design according to the actual requirements, the evaporator Pipe can be 3,4,5,6, and the evaporation structure is simple, easily installation, first spiral fin coil and Second spiral fin coil, is inclined upwardly, and easy to the media flow of its inside, is easy to absorb heat.

2. the fluidized-bed combustion boiler provided by the utility model with evaporator, is absorbed heat so that superheater goes out by evaporator The flue-gas temperature of mouthful (i.e. economizer import) is not very high so that economizer and air preheater can be according to conventional designs, no The upper too many Air Preheater Heating Surface of design is needed, and since the coefficient of heat transfer of evaporator is more much larger than air preheater, this The heating surface for the evaporator that sample can design is relatively small very much, can save boiler manfacturing and installation cost, has very high Economy, and the boiler for having run, other coals of particularly burning are changed to the anthracitic boiler that burns again, often There is the problem of high fume temperature, increase air preheater without enough spaces in this boiler, and economizer Heat absorption also reaches the design upper limit, and being further added by economizer can cause steam quality in economizer to exceed the 20% of design code, influence pot Stove safe operation, increase evaporator can sponge excessive flue gas heat, therefore the boiler run can continue to pacify Full use.

Brief description of the drawings

Fig. 1 is the structure diagram of evaporator provided by the utility model；

Fig. 2 is the flow chart of the circulating fluidized bed boiler provided by the utility model with evaporator；

In figure, 1- import headers, 2- outlet headers, the first spiral fin coils of 3-, 4- import end pipes, the second helical fins of 5- Pipe, 6- outlets end pipe, 7- connecting tubes.

Embodiment

The utility model provides a kind of evaporator and the circulating fluidized bed boiler with the evaporator, below with specific real Example is applied to illustrate embodiment, it will be appreciated that specific embodiment described herein only to explain the utility model, It is not used to limit the utility model.

Embodiment 1

With reference to shown in Fig. 1 and Fig. 2, the utility model provides a kind of evaporator and the recirculating fluidized bed with the evaporator Boiler, including steam-generating bank and the import header 1, the outlet header 2 that are located at the steam-generating bank both ends respectively, the evaporation tube Beam includes multigroup evaporation tube, and the evaporation tube includes sequentially connected import end pipe 4, the first spiral fin coil 3, connecting tube 7, the Two spiral fin coils 5 and outlet end pipe 6, the other end of the import end pipe 1 are connected with import header 1, the outlet end pipe 6 The other end be connected with outlet header 2.

(quantity of evaporation tube can be according to the load of circulating fluidized bed boiler to be arranged in order setting for multigroup evaporation tube It is configured, the quantity of the evaporation tube can be 3,4,5,6 etc., and the quantity of evaporation tube is 3 in the present embodiment Root)；Multiple first spiral fin coils 3 is are arranged in parallel, and the angle formed with horizontal plane that is inclined upwardly is >=15 °； Multiple second spiral fin coils 5 is are arranged in parallel, and the angle formed with horizontal plane that is inclined upwardly is >=15 °；It is multiple The outlet end pipe 6 is horizontally disposed, and is parallel to each other；Multiple import end pipes 4 are horizontally disposed, and are parallel to each other；It is more A connecting tube 7 is horizontally disposed, and is parallel to each other, or multiple connecting tubes 7 are set for arc, and is parallel to each other, 5 acclivitous design of first spiral fin coil 3 and second spiral fin coil so that the medium in the evaporation tube Flowing, enhancing heat dissipation.

The effect of the evaporator is so that the vapoury water after economizer heating further absorbs heat, improves it and contains Vapour rate, so as to reduce the flue-gas temperature of economizer import, reduces the heating surface arrangement of economizer and air preheater, reaches reduction The purpose of boiler entirety heating surface.

A kind of circulating fluidized bed boiler with evaporator, including burner hearth, superheater, evaporator, the province's coal set gradually Device and air preheater.Water-cooling system is equipped with the burner hearth, and one end of the burner hearth is additionally provided with separator.

The circulating fluidized bed boiler operation principle, after fuel is admitted to burner hearth, rapidly by existing a large amount of lazy in burner hearth Property high-temperature material (bed material) surround, First air and Secondary Air needed for ignition are sent from the bottom of burner hearth and side wall respectively Enter, material burns in burner hearth in Fludized boiling.Moved under the action of ascending air to upper furnace, to water-cooling system Heating surface heat release.Large granular materials are raised after air-flow brings floating zone into, are constantly slowed down under gravity and the effect of other external force inclined From primary air, and ultimately form attached wall and decline particle flux, be less easily entrained by the solid material of the flake hearth-tapping quilt in gas-solid separator Collect and burner hearth circulating combustion is sent back to by material-returning device until after-flame.Afterbody cigarette is not entered with flue gas by separated superfine particle Road, further cools down the heat releases such as superheater, economizer, air preheater.

Fuel combustion, gas-solid fluid is brought into by the heat of heating surface heat release, recycling ash and supplement material and deslagging and band Go out, forming thermal balance makes fire box temperature maintain in certain temperature level.The presence of substantial amounts of circulating ash, preferably maintains stove The temperature homogenisation of thorax, increases heat transfer, and fuel excludes to maintain the thing of burner hearth into ash, desulfurization with supplement material and thick slag Material balance.

The characteristics of circulating fluidized bed boiler

Flammable burning inferior coal

Because of the distinctive flying dust recirculation structure of circulating fluidized bed boiler, the big I of flying dust recirculation volume changes in bed (combustion Burn room) absorbed fraction, i.e., any colm can fully burn, so circulating fluidized bed boiler is special to the adaptability of fuel It is good.

High combustion efficiency

Since circulating fluidized bed boiler uses fly-ash recirculating combustion, its boiler combustion efficiency is up to 95%-99%.

Save the energy

Since the coal dust of burning in circulating fluid bed boiler compares for pulverized-coal fired boiler, it is not necessary to the coal-grinding through excessive power consumption Machine is milled into thinner coal dust, so having achieveed the purpose that to save electric energy.

Environmental protection

Due in Process of Circulating Fluidized Bed Boiler, with the addition of lime stone, desulfuration in furnace is carried out, and ignition temperature is low, The sour gas of flue gas emission is greatly reduced, undoubtedly suction of preserving the ecological environment will be acted on.In addition fluidized bed combustion produces Lime-ash activity it is good, can making cement admixture, construction material etc., this gives up change can play important work into use, protection land resource With.

Finally it should be noted that：Above-described each embodiment is merely to illustrate the technical solution of the utility model, rather than It is limited；Although the utility model is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art It should be understood that：It can still modify the technical solution described in previous embodiment, or to which part or whole Technical characteristic carries out equivalent substitution；And these modifications or substitutions, the essence of appropriate technical solution is departed from the utility model The scope of each embodiment technical solution.

Claims (10)

1. a kind of evaporator, it is characterised in that including steam-generating bank and respectively positioned at the inlet header at the steam-generating bank both ends Case, outlet header, the steam-generating bank include multigroup evaporation tube, and the evaporation tube includes sequentially connected import end pipe, first Spiral fin coil, connecting tube, the second spiral fin coil and outlet end pipe, the other end of the import end pipe are connected with inlet header Case, the other end of the outlet end pipe are connected with outlet header.

2. evaporator according to claim 1, it is characterised in that multigroup evaporation tube is to be arranged in order setting.

3. evaporator according to claim 2, it is characterised in that multiple first spiral fin coils are to be arranged in parallel, And the angle for being inclined upwardly and being formed with horizontal plane is >=15 °.

4. evaporator according to claim 3, it is characterised in that multiple second spiral fin coils are to be arranged in parallel, And the angle for being inclined upwardly and being formed with horizontal plane is >=15 °.

5. evaporator according to claim 4, it is characterised in that multiple outlet end pipes are horizontal to set, and mutually It is parallel.

6. evaporator according to claim 5, it is characterised in that multiple import end pipes are horizontal to set, and mutually It is parallel.

7. evaporator according to claim 6, it is characterised in that multiple connecting tubes are horizontally disposed, and mutually flat OK.

8. evaporator according to claim 6, it is characterised in that multiple connecting tubes are set for arc, and mutually flat OK.

A kind of 9. circulating fluidized bed boiler with claim 1-8 any one of them evaporators, it is characterised in that including according to Burner hearth, superheater, evaporator, economizer and the air preheater of secondary setting.

10. circulating fluidized bed boiler according to claim 9, it is characterised in that water-cooling system is equipped with the burner hearth, and One end of the burner hearth is additionally provided with separator.