CN206739622U - A kind of assembly type boiler of organic heat carrier - Google Patents

Abstract

The utility model provides a kind of assembly type boiler of organic heat carrier, including radiant section pipe group, connection flue and convection section tube bank, connect one end connection radiant section pipe group of flue, the other end connects convection section tube bank, the top of radiant section pipe group is provided with roof tube pipe group, and the side wall at the close top of convection section tube bank is provided with oil inlet, and the side wall of the close bottom of convection section tube bank is provided with oil-out, oil-out connecting spray nozzle, jet pipe stretch into radiant section Guan Zuzhong lower section.Boiler of organic heat carrier described in the utility model, isolate radiation and convection heating surface, combustion chamber is arranged using individual layer boiler tube, snakelike tubular construction arranges convection section, maximum convenience in transport and installation, and super-huge boiler is equally applicable, heating power does not almost have the upper limit, and using the form of helical fin, strengthen convection heating surface, heat transfer is much better than disk tubular construction.And very convenient in maintenance, nearly all part can repair and change through row, and its operating efficiency is high, reduces production cost.

Description

Assembled organic heat carrier boiler

Technical Field

The utility model belongs to the pressure vessel field, concretely relates to assembled organic heat carrier boiler.

Background

In recent years, large and super-large organic heat carrier boilers are in strong demand in the market of organic heat carrier boilers, the market has higher requirements on environmental protection, and the requirements on emission of atmospheric pollutants are increasingly strict. With the trend toward larger oil (gas) organic heat carrier boilers, conventional self-contained structures are severely limited in terms of, for example, transport size and transport weight. And a large-scale organic heat carrier boiler is a chemical industry enterprise for a lot of users, and a part of waste oil and waste gas needs to be digested inside the enterprise. The common method is that the incinerator is burnt out or directly enters the boiler to serve as a part of fuel, the three rings of coil pipes inside and outside the cylindrical boiler are sleeved with each other, the gap is small, once accidents occur, such as blockage of a flue gas channel, the boiler can not be cleaned and maintained, and only a main engine of the boiler can be replaced. The replacement of the main engine of the large-sized and super-large-sized boilers is too costly and seriously does not meet the market demand. And generally, the whole factory reaches the limit of the conventional furnace type at about 1500 ten thousand calories per hour, and a furnace type with larger heat supply can not be designed. The maximum heat supply of a conventional fuel oil (gas) organic heat carrier boiler is about 25 steam tons, namely 1500 ten thousand kilocalories or 1600 ten thousand kilocalories. The main structure is a three-layer coil structure, and the smoke trend is two return strokes/three return strokes/four return strokes. In the conventional structure, the arrangement of the heating surface is severely limited, and the heating surface adopts a large-specification steel pipe structure, such as phi 108/phi 133/phi 159, which is connected in parallel in multiple heads. Problems with this structure: 1. as shown in fig. 1-2, the tube diameter is large and the parallel lead is small, so that the structure has problems of heat receiving surface, radiation absorption and convection heat release. Firstly, looking at the convection heating surface, the arrangement of the heating surface on the large-diameter steel pipe causes that the convection heating surface needs more arrangement and is difficult to arrange. Compared with most industrial boiler convection heating surfaces, the pipe diameters of phi 38/phi 45/phi 51/phi 57 are almost adopted, small pipe flow bodies can uniformly pass through the pipe diameters, the heat exchange effect is far better than that of large pipe diameters, the weight of the heating surface is relatively small, and the structure is compact. In the radiation heating surface, convection and radiation parallel structure, partial flow passes through the radiation heating surface, the flow in the tube of the radiation heating surface needs to be accurately estimated, the flow speed is controlled in a corresponding range, the matching of the flow and the heat absorption capacity is ensured, and the temperature in each tube is basically consistent. But instead of the other end of the tubeAnd most industrial boilers have large load fluctuation, the heat absorption percentage of the radiation section is far larger than the design value under the condition of low load, and the temperature deviation of fluid in the tubes of the radiation section and the convection section is large and can reach 40 ℃ at most. The result is that the oil temperature in a certain steel pipe is relatively higher, when the temperature of the main fluid reaches 320 ℃ or above, the requirement on the heat carrier is very high, the temperature of the basic model selection liquid film needs 370 ℃ or 375 ℃, the damage to the heat carrier is large, and the arrangement requirement on the heating surface of the boiler is very strict. 2. Transportation problems: the diameter of the outer cylinder of the 1600 ten thousand cards/hour gas heat transfer oil boiler is basically between 4200 and 4500mm, the height of transportation is basically about 4600 and 5000mm by adding the collecting box and the transportation base, the diameter of the outer cylinder of the 2000 ten thousand cards/hour gas heat transfer oil boiler even reaches 4600 and 5000mm, and the transportation size needs 5000mm to 5400 mm. The height of domestic transportation is 5m, and basically traditional structure can only keep warm and outsourcing on site, and collection case and outlet pipe need the on-site butt joint, and the transportation weight exceeds 70 tons, and is very big to domestic road and bridge injury. 3. The radiant heating surface arrangement is limited to transportation, so all large organic heat carrier boilers (self-contained) select combustion equipment to adjust the flame size, and the selected flame is slender. Taking 1200 million calories/hour fuel oil (gas) organic heat carrier as an example, the volume of a boiler furnace is 55.06m³Volumetric heat load of 279KW/m³The theoretical combustion temperature is 2000 ℃. At this time, the full load operation is carried out, the diameter of the coil pipe at the inner ring is 2600mm, and the original generation of Nox is actually measured to exceed 150mg/Nm³. (national discharge Standard 200mg/Nm³)4, as shown in figure 3, the top is integrally cast, and a dry-back structure needs a large amount of casting materials and insulating layers for heat preservation. And more castable and thermal insulation material are in a high-temperature state, the heat storage is large, the flow rate of the heat carrier is slowed down when the vehicle is temporarily stopped or power is cut off emergently, and the heat carrier is greatly damaged by a structure with large heat storage. And a large number of grabbing nails are arranged on the structure to firmly grab the casting material, and the casting material falls off due to continuous cold and hot expansion after one year to two years. The wall of a similar coal stove is poured again after two or three years.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an assembled organic heat carrier boiler overcomes above-mentioned defect, through the improvement to boiler radiation section nest of tubes, convection section nest of tubes and ceiling pipe nest of tubes device, solves foretell problem.

For solving the technical problem, the utility model provides an assembled organic heat carrier boiler, including radiation section nest of tubes, connection flue and convection section nest of tubes, the one end of connecting the flue is connected the radiation section nest of tubes, the other end is connected the convection section nest of tubes, be equipped with ceiling nest of tubes on the top of radiation section nest of tubes, be equipped with the oil inlet on the lateral wall that is close to the top of convection section nest of tubes, be equipped with the oil-out on the lateral wall that is close to the bottom of convection section nest of tubes, the spray tube is connected to the oil-out, the spray tube stretches into below in the radiation section nest of tubes.

As an optimal selection scheme of assembled organic heat carrier boiler, the convection section nest of tubes divide into convection section nest of tubes and lower convection section nest of tubes, go up convection section nest of tubes and be longitudinal symmetry with lower convection section nest of tubes, go up convection section nest of tubes and pass through the commentaries on classics union coupling with lower convection section nest of tubes, the periphery of convection section nest of tubes is fixed by many first steelframes, sealed by the first shrouding of polylith.

As an optimal scheme of assembled organic heat carrier boiler, it has first pipeline, second pipeline to go up the convection section nest of tubes, the convection section nest of tubes has third pipeline and fourth pipeline down, first pipeline, second pipeline, third pipeline and fourth pipeline are the coiled pipe, first pipeline with the second pipeline is parallel, the third pipeline with the fourth pipeline is parallel, the upper end intercommunication of first pipeline and second pipeline the oil inlet, the lower extreme intercommunication the one end of commentaries on classics pipe, the upper end intercommunication of third pipeline and fourth pipeline the other end of commentaries on classics pipe, the lower extreme intercommunication the oil-out.

As an optimal selection scheme of assembled organic heat carrier boiler, the radiation section nest of tubes is the structure of being cavity, periphery for heating coil in the middle of one, the spray tube stretches into in the cavity, the periphery of radiation section nest of tubes is fixed by many second steelframes, is sealed by polylith second shrouding.

As the utility model relates to an assembled organic heat carrier boiler's an preferred scheme, heating coil is the spiral finned tube.

As an optimal selection scheme of assembled organic heat carrier boiler, the radiation section nest of tubes still includes the mount, the mount is fixed and supports heating coil, the radiation section nest of tubes is horizontal hanging screen structure.

As an assembled organic heat carrier boiler's a preferred scheme, organic heat carrier boiler is still including the platform that is used for overhauing and observing, the platform is close to the radiation section nest of tubes, the height of platform is higher than the sum of the height of ceiling pipe nest of tubes and the height of radiation section nest of tubes, the platform is equipped with the platform staircase, the platform staircase with the second steelframe is connected.

As an optimized proposal of the assembled organic heat carrier boiler, the heating coil is a single-layer furnace tube.

As an assembled organic heat carrier boiler's an preferred scheme, the ceiling pipe nest of tubes adopts the membrane wall structure, the ceiling pipe nest of tubes includes third steelframe, sealed housing, girder steel, ceiling pipe and membrane wall band steel, the top of ceiling pipe by sealed housing is sealed, the ceiling pipe passes through the girder steel hangs on the third steelframe, the top of ceiling pipe is equipped with membrane wall band steel.

As an optimal selection scheme of assembled organic heat carrier boiler, the ceiling pipe nest of tubes is wet back of the body formula structure, the ceiling pipe nest of tubes still includes top pouring and insulation material, top pouring and insulation material set up on ceiling pipe and diaphragm type wall band steel.

Compared with the prior art, the utility model provides an assembled organic heat carrier boiler separates radiation and convection heating surface, adopts the individual layer boiler tube to arrange the combustion chamber, and the convection section is arranged to the coiled pipe structure, and the biggest convenient transportation and installation, and super-huge boiler are suitable for equally, and heating power does not have the upper limit almost. Meanwhile, in the gas furnace type, a spiral fin mode is adopted, the convection heating surface is strengthened, and the heat transfer is far superior to that of a circular tube structure. And the maintenance is very convenient, almost all parts can be maintained and replaced, the working efficiency is high, and the production cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein,

FIG. 1 is a schematic partial structure diagram of an organic heat carrier boiler in the prior art;

FIG. 2 is a schematic structural diagram of a radiant tube and a convection tube of an organic heat carrier boiler in the prior art;

FIG. 3 is a schematic structural diagram of a top dry-back structure of an organic heat carrier boiler in the prior art;

fig. 4 is a schematic structural diagram of an assembled organic heat carrier boiler according to the present invention;

fig. 5 is a schematic sectional structure diagram of a partial structure of an assembled organic heat carrier boiler according to the present invention.

Wherein: the device comprises a radiation section pipe group 1, a connecting flue 2, a ceiling pipe group 3, a sealing housing 31, a steel beam 32, a ceiling pipe 33, a membrane wall flat steel 34, a third steel frame 35, a top pouring and heat insulation material 36, a spray pipe 4, an upper convection section pipe group 51, a first pipeline 511, a second pipeline 512, a lower convection section pipe group 52, a third pipeline 521, a fourth pipeline 522, an oil inlet 53, an oil outlet 54, a rotating pipe 6, a first steel frame 7, a first sealing plate 8, a second sealing plate 9, a second sealing plate 10, a heating coil 11, a steel frame 12, a fixing frame 13 and a platform staircase 131.

Detailed Description

Assembled organic heat carrier boiler, it includes: radiant section tube bank 1, connecting flue 2 and convection section tube bank (not shown).

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the following embodiments.

First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Secondly, the utility model discloses utilize the structure schematic diagram etc. to describe in detail, when detailing the embodiment of the utility model, for the convenience of explanation, the schematic diagram that shows an assembled organic heat carrier boiler structure can not do local the enlargeing according to general proportion, moreover the schematic diagram is the example, and it should not limit here the scope of the protection of the utility model. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.

Example one

Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of an assembled organic heat carrier boiler according to the present invention; fig. 5 is a schematic sectional structure diagram of a partial structure of an assembled organic heat carrier boiler according to the present invention. As shown in fig. 4 and 5, one end of the connection flue 2 is connected to the radiation section pipe group 1, the other end is connected to the convection section pipe group, the ceiling pipe group 3 is arranged on the top of the radiation section pipe group 1, an oil inlet 53 is arranged on the side wall of the convection section pipe group close to the top, an oil outlet 54 is arranged on the side wall of the convection section pipe group close to the bottom, the oil outlet 54 is connected to the spray pipe 4, and the spray pipe 4 extends into the lower part of the radiation section pipe group 1. The pipe diameter of the convection section pipe group is phi 38/phi 45, the external header is connected with the radiation section pipe group 1 and the convection section pipe group, the whole flow is more reasonable, the heat exchange effect is good, the size is small, the heat utilization rate is very high, the smoke resistance is small, the smoke of the vertical structure naturally settles, and the use of various fuels is more facilitated.

The convection section tube group is divided into an upper convection section tube group 51 and a lower convection section tube group 52, the upper convection section tube group 51 and the lower convection section tube group 52 are vertically symmetrical, and the upper convection section tube group 51 and the lower convection section tube group 52 are connected by the rotating tube 6. The upper convection section pipe group 51 is provided with a first pipeline 511 and a second pipeline 512, the lower convection section pipe group 52 is provided with a third pipeline 521 and a fourth pipeline 522, the first pipeline 511 is parallel to the second pipeline 512, the third pipeline 521 is parallel to the fourth pipeline 522, the upper ends of the first pipeline 511 and the second pipeline 512 are communicated with the oil inlet 54, the lower end of the first pipeline 511 is communicated with one end of the rotary pipe 6, the upper ends of the third pipeline 521 and the fourth pipeline 522 are communicated with the other end of the rotary pipe 6, and the lower end of the third pipeline 521 and the lower end of the fourth pipeline 522 are communicated with the oil outlet 54.

Compared with the existing boilers, the two boilers basically have no great difference in the size of the furnace and the combustion temperature, but the difference in the flue gas flow speed and the arrangement of the convection section is great. The cylindrical furnace generally adopts a faster flue gas flow velocity to achieve the purpose of heat transfer enhancement because the heat transfer coefficient is relatively lower and the condition that the coil pipe clearance is too large and the flue gas is mixed during manufacturing exists. The advantage of this is that it partially solves the problem that the heat exchange area of the convection section can not be arranged sufficiently, but must face the problem of large flue gas flow velocity. The smoke resistance of the boiler with two return strokes is not largeThe state requires low emission, and when the Nox emission standard requires as low as 80mg/Nm³Even 30mg/Nm³At the time, a low-nitrogen burner and a flue gas circulation scheme or both schemes must be adopted. The principle of flue gas circulation (FGR) is to introduce about 30 percent of low-temperature flue gas into a hearth, reduce the combustion temperature of the hearth, reduce the volume heat load of the hearth and achieve the purpose of reducing the generation of Nox. The average flue gas velocity of the conventional furnace type is about 20m/s (large fuel oil and gas), 30 percent of tail gas is added to enter a hearth, the flue gas velocity needs to reach 26m/s or even higher, and the flue gas velocity is close to 40m/s when the tail gas is diverted at high temperature. At the moment, the flue gas speed is too fast, the heating surface pipe is influenced, phenomena such as shaking and the like can occur, the round steel connected between the coil pipes can be influenced under severe conditions, and the heating surface pipe wall is damaged when the round steel falls off, so that the pipeline in the furnace is leaked. Under more extreme working conditions, when the smoke resistance is increased above the allowance of the conventional fan, the fan with higher pressure head needs to be matched, otherwise, the output of the combustor is greatly influenced. Accordingly, the first, second, third and fourth tubes 511, 512, 521 and 522 are each serpentine tubes. The flue gas velocity of the convection section flue gas channel arranged by the coiled pipe can be controlled to be 10-15m/s, once flue gas circulation is introduced or the short-time overload operation is carried out, the ideal effect can be completely achieved, and any equipment does not need to be replaced.

The radiant section pipe group 1 is of a structure with a cavity in the middle and a heating coil pipe 11 on the periphery, and the spray pipe 4 extends into the cavity. The maximum transport width of the 2000 kilocalories per hour boiler is 4050mm, the transport height is 4050mm, and the transport weight is 40 tons at most. The radiation section pipe group 1 adopts phi 133 pipe diameter multi-head parallel connection, full flow passes through the radiation section pipe group 1, temperature rise is uniform, flow deviation is small, flow velocity in the radiation section pipe group 1 is easy to control, heat exchange effect of the radiation section pipe group 1 is good, and meanwhile, a hearth with larger space is beneficial to combustion. The diameter of the inscribed circle of the heating coil pipe 11 in the radiant section pipe group 1 is 3400mm, and the volume of the hearth is 106.7m³The heat load of the furnace volume is 247KW/m³Theoretical combustion temperature of 1966 ℃ and Nox original emission of less than 150mg/Nm³。

The radiant section pipe group 1 and the convection section pipe group completely adopt an optimized heat exchange structure for heat exchange, the heat transfer is enhanced to a large extent, the natural gas and light oil are very convenient to use under the condition that the natural gas and the light oil are used as fuels, the heating coil pipe 11 is a spiral finned pipe for enhancing a convection heating surface, and the heat transfer is far superior to that of a circular pipe structure. The radiation section pipe group 1 can adopt a horizontal hanging screen pipe structure, the whole structure is very compact, the fixing frame 12 fixes and supports the heating coil 11, and the heating coil 11 is self-supported. The method has the advantages of low load requirement in unit area, convenient civil engineering and the like. And the smoke circulation area is increased in the high-temperature area, so that the smoke circulation speed in the high-temperature area is ensured not to shake too fast.

The periphery of convection current section nest of tubes is fixed by many first steelframes 7, sealed by the first shrouding 8 of polylith, and the periphery of radiation section nest of tubes 1 is fixed by many second steelframes 9, sealed by polylith second shrouding 10, and such overall seal structure, all steelframes and shrouding adopt full seal structure, and the cigarette phenomenon of leaking no longer appears after the gas-tight test, and is fit for two kinds of ventilation forms of pressure-fired burning and balanced ventilation.

The organic heat carrier boiler further comprises a platform 13 for overhauling and observing, the platform 13 is close to the radiation section pipe group 1, the height of the platform 13 is higher than the sum of the height of the ceiling pipe group 3 and the height of the radiation section pipe group 1, the platform 13 is provided with a platform escalator 131, the platform escalator 131 is connected with the second steel frame 9, a standard 45-degree or 50-degree inclined ladder stand is adopted, a standard steel platform is adopted, humanized design and construction are achieved, and operation is facilitated. The manufacture is direct, and the field splicing is carried out.

The heating coil 11 is a single layer coil.

The ceiling pipe group 3 adopts a membrane wall structure, the ceiling pipe group 3 comprises a third steel frame 35, a sealing housing 31, a steel beam 32, a ceiling pipe 33 and membrane wall flat steel 34, the top of the ceiling pipe 33 is sealed by the sealing housing 31, the ceiling pipe 33 is hung on the third steel frame 35 through the steel beam 32, and the membrane wall flat steel 34 is arranged above the ceiling pipe 33. The ceiling pipe 33 is sealed with a sealing cover 31 after the pipe is let out. The ceiling pipe is hung with third steelframe 35 with girder steel 32, has solved the ceiling pipe 33 bearing problem. The structure is a wet-back structure, the top pouring and heat insulation material 36 is arranged on the ceiling pipe 33 and the membrane type wall flat steel 34, the problem that the conventional furnace type top pouring material can fall off when being used for a period of time is solved, and the long-term stable operation can be realized.

The following takes a 2000 ten thousand kilocalories/hour oil (gas) heat transfer oil boiler as an example:

it should be understood by those skilled in the art that one of the features or objects of the present invention is to: the utility model provides an assembled organic heat carrier boiler separates radiation and convection heating surface, adopts the individual layer boiler tube to arrange the combustion chamber, and the convection section is arranged to the coiled pipe structure, and the biggest convenient transportation and installation, and the super-huge boiler is suitable for equally, and the heating power does not have the upper limit almost. Meanwhile, in the gas furnace type, a spiral fin mode is adopted, the convection heating surface is strengthened, and the heat transfer is far superior to that of a circular tube structure. And is convenient in maintenance, and almost all parts can be maintained and replaced.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (10)

1. The utility model provides an assembled organic heat carrier boiler, characterized by: the convection section pipe group is connected with one end of the connecting flue, the other end of the connecting flue is connected with the convection section pipe group, a ceiling pipe group is arranged on the top of the radiation section pipe group, an oil inlet is formed in the side wall, close to the top, of the convection section pipe group, an oil outlet is formed in the side wall, close to the bottom, of the convection section pipe group, the oil outlet is connected with a spray pipe, and the spray pipe extends into the lower portion of the radiation section pipe group.

2. An assembled organic heat carrier boiler according to claim 1, characterized in that: convection section nest of tubes divide into convection section nest of tubes and lower convection section nest of tubes, go up convection section nest of tubes and be the longitudinal symmetry with lower convection section nest of tubes, go up convection section nest of tubes and pass through the commentaries on classics union coupling with lower convection section nest of tubes, the periphery of convection section nest of tubes is fixed by many first steelframes, sealed by the first shrouding of polylith.

3. An assembled organic heat carrier boiler according to claim 2, characterized in that: the upper convection section pipe set is provided with a first pipeline and a second pipeline, the lower convection section pipe set is provided with a third pipeline and a fourth pipeline, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all coiled pipes, the first pipeline is parallel to the second pipeline, the third pipeline is parallel to the fourth pipeline, the upper ends of the first pipeline and the second pipeline are communicated with the oil inlet, the lower ends of the first pipeline and the second pipeline are communicated with one end of the rotary pipe, the upper ends of the third pipeline and the fourth pipeline are communicated with the other end of the rotary pipe, and the lower ends of the third pipeline and the fourth pipeline are communicated with the oil outlet.

4. An assembled organic heat carrier boiler according to claim 1, characterized in that: the radiant section nest of tubes is the structure that is cavity, periphery for heating coil in the middle of being, the spray tube stretches into in the cavity, the periphery of radiant section nest of tubes is fixed by many second steelframes, is sealed by polylith second shrouding.

5. An assembled organic heat carrier boiler according to claim 4, characterized in that: the heating coil is a spiral finned tube.

6. An assembled organic heat carrier boiler according to claim 4, characterized in that: the radiation section pipe set further comprises a fixing frame, the fixing frame is used for fixing and supporting the heating coil, and the radiation section pipe set is of a horizontal hanging screen pipe structure.

7. An assembled organic heat carrier boiler according to claim 4, characterized in that: the organic heat carrier boiler still includes the platform that is used for overhauing and observes, the platform is close to the radiation section nest of tubes, the height of platform is higher than the sum of the height of ceiling pipe nest of tubes and the height of radiation section nest of tubes, the platform is equipped with the platform staircase, the platform staircase with the second steelframe is connected.

8. An assembled organic heat carrier boiler according to claim 4, characterized in that: the heating coil is a single-layer furnace tube.

9. An assembled organic heat carrier boiler according to claim 4, characterized in that: the ceiling pipe group is of a membrane type wall structure and comprises a third steel frame, a sealing housing, a steel beam, a ceiling pipe and membrane type wall flat steel, the top of the ceiling pipe is sealed by the sealing housing, the ceiling pipe is suspended on the third steel frame through the steel beam, and the membrane type wall flat steel is arranged above the ceiling pipe.

10. An assembled organic heat carrier boiler according to claim 1, characterized in that: the ceiling pipe group is of a wet-back structure and further comprises a top pouring and heat insulation material, and the top pouring and heat insulation material is arranged on the ceiling pipe and the membrane wall flat steel.