CN214468735U - Large-scale low-nitrogen condensation combined gas boiler adopting expansion flue - Google Patents

Abstract

A large-scale low-nitrogen condensation combined gas boiler adopting an expansion flue relates to a gas boiler, and the utility model aims to solve the problem that a flue gas circulation channel cannot be formed between a hearth component and a convection component of a split boiler due to high temperature; nitrogen oxides generated during combustion of the gas boiler affect the air quality; heat carried by water vapor generated after combustion is lost; condensate water of the gas boiler is weakly acidic and can corrode a heated surface; the installation period is long when the split boiler is installed. The convection assembly is arranged on the side face of the hearth assembly, the convection assembly is connected with the hearth assembly through a first pipeline and a hearth outlet connecting flue, the hearth outlet connecting flue is provided with a fire-resistant layer, an expansion joint and a heat-insulating layer, the energy saver is arranged above the hearth assembly, and the energy saver is connected with the hearth assembly through a second pipeline and an energy saver connecting flue.

Description

Large-scale low-nitrogen condensation combined gas boiler adopting expansion flue

Technical Field

The utility model relates to a gas boiler specifically is a large-scale low-nitrogen condensation combination formula gas boiler who adopts inflation flue.

Background

The design of current gas boiler flue is that the steel sheet welding is adopted at flue gas low temperature section more, the steel sheet covers the heat preservation outward, constitute flue gas circulation passageway through arranging tube panel or rare tube bank at high temperature region, welding steel sheet formation is sealed between the tube bank, the outside insulation material that lays, intraductal water can play cooling's effect when flowing like this, but furnace subassembly and convection current subassembly are when the components of a whole that can function independently design, because the junction of two bodies is in the high temperature state, so can't arrange the tube bank, can't constitute flue gas circulation passageway, thereby influence the in service behavior of boiler.

Meanwhile, the gas boiler can reduce the emission of dust and particulate matters, but the gas of the gas boiler can generate a large amount of thermal type nitrogen oxides during combustion, and the emission of the thermal type nitrogen oxides (NOx) is the main reason for causing haze.

The water vapor generated after combustion can be discharged into the atmosphere along with high-temperature flue gas, and the heat carried by the water vapor can reach 10% of the low-level heating value of the fuel at most, so that the heat carried by the water vapor can run off uselessly.

The condensate water of the gas boiler is weakly acidic, ND steel is mostly selected for a heating surface at the tail of the boiler in the industry, the ND steel has the characteristic of sulfuric acid low-temperature dew point corrosion resistance, weak acid corrosion cannot be overcome, and the heat transfer performance can be reduced after the heating surface is corroded, so that energy waste is caused.

The existing split boiler needs a longer installation period during installation, which wastes both manpower and time.

In summary, the following problems exist in the prior art:

1. a flue gas circulation channel cannot be formed between a hearth component and a convection component of the split boiler due to high temperature.

2. Gas boiler can produce a large amount of heating power type nitrogen oxides when burning, and excessive nitrogen oxide can cause the haze, influences the quality of air.

3. The water vapor generated after combustion is discharged into the atmosphere, resulting in the loss of heat carried in the water vapor.

4. The condensate water of the gas boiler is weakly acidic, and the condensate water can corrode a heating surface after flowing through the heating surface, so that the heat transfer performance is reduced, and the energy waste is caused.

5. The existing split boiler needs a longer installation period during installation, which wastes both manpower and time.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that exists among the prior art, and then provide a large-scale low nitrogen condensation combination formula gas boiler who adopts the expansion flue.

The utility model adopts the technical proposal that:

the boiler comprises a hearth component, a convection component, an energy saver, a hearth outlet connecting flue, a first pipeline and a second pipeline, wherein the convection component is arranged on the side surface of the hearth component, a flue gas outlet part of the hearth component is fixedly connected with a flue gas inlet part of the convection component through the hearth outlet connecting flue, a water outlet part of the hearth component is fixedly connected with a water inlet part of the convection component through the first pipeline, the energy saver is arranged above the hearth component, a water outlet part of the energy saver is connected with a water inlet part of the hearth component through the second pipeline, a flue gas outlet part of the convection component is connected with a flue gas inlet part of the energy saver through the connecting flue,

the hearth component comprises an upper hearth component collection box, a lower hearth component collection box, a front water-cooling wall of the hearth component, a rear water-cooling wall of the hearth component, a left hearth component membrane wall and a right hearth component membrane wall,

the hearth component upper header and the hearth component lower header are arranged in parallel, the hearth component upper header is positioned above the hearth component lower header, two hearth component water outlets are arranged at the positions, close to the front end, of the hearth component upper header, two hearth component water inlets are arranged at the positions, close to the rear end, of the hearth component upper header, the hearth component front water-cooling wall comprises a hearth component front water-cooling wall lower header and a hearth component front water-cooling wall upper header, the hearth component front water-cooling wall lower header is arranged in parallel with the hearth component front water-cooling wall upper header, the hearth component front water-cooling wall lower header is positioned below the hearth component front water-cooling wall upper header, the hearth component front water-cooling wall lower header is fixedly arranged at the left end of the hearth component lower header, the hearth component front water-cooling wall lower header is perpendicular to the hearth component lower header, the hearth component front water-cooling wall lower header is communicated with the hearth component lower header, and the hearth component front water-cooling wall upper header is fixedly arranged at the left end of the hearth component upper header, and the upper header of the front water-cooled wall of the hearth component is vertical to the upper header of the hearth component, the upper header of the front water-cooled wall of the hearth component is communicated with the upper header of the hearth component, the rear water-cooled wall of the hearth component comprises a lower header of the rear water-cooled wall of the hearth component and an upper header of the rear water-cooled wall of the hearth component, the lower header of the rear water-cooled wall of the hearth component is arranged in parallel with the upper header of the rear water-cooled wall of the hearth component, the lower header of the rear water-cooled wall of the hearth component is positioned below the upper header of the rear water-cooled wall of the hearth component, the lower header of the rear water-cooled wall of the hearth component is fixedly arranged at the right end of the lower header of the hearth component, the lower header of the rear water-cooled wall of the hearth component is vertical to the lower header of the hearth component, the lower header of the rear water-cooled wall of the hearth component is communicated with the lower header of the hearth component, the upper header of the rear water-cooled wall of the hearth component is fixedly arranged at the right end of the upper header of the hearth component, and the upper header of the rear water-cooled wall of the hearth component is vertical to the upper header of the hearth component, the upper header of the water-cooled wall behind the hearth component is communicated with the upper header of the hearth component, the center of the hearth component is provided with a hearth along the length direction, the left side of the outside of the hearth is provided with a left membrane wall of the hearth component, the left membrane wall of the hearth component consists of a plurality of tube banks of the hearth component, one end of the left membrane wall of the hearth component is fixedly connected with the lower header of the hearth component, the other end of the left membrane wall of the hearth component is fixedly connected with the upper header of the hearth component, the right side of the outside of the hearth is provided with a right membrane wall of the hearth component, the right membrane wall of the hearth component consists of a plurality of tube banks of the hearth component, the plurality of tube banks of the hearth component are arranged in parallel in a membrane mode, one end of the right membrane wall of the hearth component is fixedly connected with the lower header of the hearth component, the other end of the right membrane wall of the hearth component is fixedly connected with the upper header of the hearth component, one end of each tube bank of the hearth inlet is fixedly arranged with the upper header of the hearth component, the other end of every furnace subassembly nest of tubes of furnace entry and the fixed setting of furnace subassembly lower header, and every furnace subassembly nest of tubes of furnace entry all encircles furnace setting, the one end of every furnace subassembly nest of tubes of furnace bottom and the fixed setting of header on the furnace subassembly, the other end of every furnace subassembly nest of tubes of furnace bottom and the fixed setting of furnace subassembly lower header, the afterbody of furnace subassembly is provided with furnace subassembly exhanst gas outlet, furnace exit gas outlet and the furnace exit linkage flue of furnace exit linkage flue advance the cigarette end fixed connection.

Has the advantages that:

1. this device adopts furnace exit linkage flue to connect furnace subassembly and convection current subassembly, furnace exit linkage flue includes the flame retardant coating, expansion joint and heat preservation, make furnace exit linkage flue have high temperature resistant through setting up the flame retardant coating, adiabatic effect, make furnace exit linkage flue can eliminate the expansion deformation after the metal is heated under 1200 ℃ of smoke temperature environment through setting up the expansion joint, can eliminate thermal expansion stress, make furnace exit linkage flue can remain the temperature through setting up the heat preservation, make the heat obtain make full use of, thereby the security of equipment operation has been improved.

2. The device adopts the structural size design of a large hearth, meets the size requirement of combustion equipment on low-nitrogen combustion, is matched with the low-nitrogen combustion technology, and realizes that NOX is less than or equal to 30mg/Nm by flue gas emission³The particles are less than or equal to 5mg/m³Sulfur dioxide is less than or equal to 10mg/m³The discharge of pollutants is reduced, and the air quality is improved.

3. The tail heating surface of the device adopts a phase change enhanced heat transfer technology by utilizing low-temperature return water, so that the exhaust gas temperature of the tail heating surface is below the dew point temperature, the gasification latent heat efficiency is improved, the sensible heat and latent heat in the exhaust gas are efficiently recovered, the exhaust gas loss is reduced, and part of fuel is saved.

4. The energy saver arranged by the device adopts the aluminum-clad finned tube type energy saver, the aluminum-clad finned tube can prevent weak acid corrosion of condensed water, the service life of the heat exchanger is greatly prolonged, and the energy saver can be used for more than 15 years.

5. When the device is used, only the connecting flue and the water pipe between the hearth component, the convection component and the energy saver are sequentially installed, the installation period of the split boiler is prolonged, and the installation time is effectively shortened on the basis of ensuring the installation quality of equipment.

6. The energy saver of the device adopts a top-placing design, is placed on the hearth component, reduces the floor space of equipment, and has stronger adaptability to the transformation of coal-fired boiler rooms, particularly boiler rooms with small plane sizes.

Drawings

Fig. 1 is a front view of the device of the present invention:

fig. 2 is a side view of the device of the present invention:

fig. 3 is a top view of the device of the present invention:

fig. 4 is a front view of the furnace assembly 1:

FIG. 5 is a top sectional view of the furnace assembly 1:

fig. 6 is a left side view of the furnace assembly 1:

FIG. 7 is a side sectional view of the furnace assembly 1:

fig. 8 is a schematic structural view of the furnace outlet connecting flue 4:

fig. 9 is a schematic view of the internal structure of the furnace outlet connecting flue 4:

fig. 10 is an enlarged view of a in fig. 8:

fig. 11 is an enlarged view of C in fig. 2:

fig. 12 is an enlarged view of B in fig. 11:

fig. 13 is a front view of the convection assembly 2:

fig. 14 is a top sectional view of the convection assembly 2:

fig. 15 is a right side view of the convection assembly 2:

fig. 16 is a side sectional view of the convection assembly 2:

fig. 17 is a side view of the convection assembly 2:

fig. 18 is a front sectional view of the economizer 3:

fig. 19 is a schematic diagram of the internal structure of the economizer 3:

fig. 20 is a front view of the economizer 3:

fig. 21 is a side view of the economizer 3:

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1-12, and the embodiment of the invention relates to a large-scale low-nitrogen condensing combined gas boiler adopting an expansion flue, the boiler comprises a hearth assembly 1, a convection assembly 2, an economizer 3, a hearth outlet connecting flue 4, a first pipeline 6 and a second pipeline 7,

the convection assembly 2 is arranged on the side surface of the hearth assembly 1, the flue gas outlet part of the hearth assembly 1 is fixedly connected with the flue gas inlet part of the convection assembly 2 through a hearth outlet connecting flue 4, the water outlet part of the hearth assembly 1 is fixedly connected with the water inlet part of the convection assembly 2 through a first pipeline 6, the energy saver 3 is arranged above the hearth assembly 1, the water outlet part of the energy saver 3 is connected with the water inlet part of the hearth assembly 1 through a second pipeline 7, the flue gas outlet part of the convection assembly 2 is connected with the flue gas inlet part of the energy saver 3 through a connecting flue,

the hearth component 1 comprises a hearth component upper header 1-1, a hearth component lower header 1-2, a hearth component front water-cooled wall 1-3, a hearth component rear water-cooled wall 1-4, a hearth component left membrane wall 1-5 and a hearth component right membrane wall 1-6,

the upper collecting box 1-1 of the hearth component and the lower collecting box 1-2 of the hearth component are arranged in parallel, the upper collecting box 1-1 of the hearth component is used for collecting and distributing boiler circulating water, an exhaust valve is arranged at the top of the upper collecting box and is convenient for exhaust, the lower collecting box 1-2 of the hearth component is used for collecting and distributing boiler circulating water, regular pollution discharge pipelines are arranged at the front end and the rear end of the bottom of the collecting box and are convenient for regularly discharging impurities in the collecting box, the upper collecting box 1-1 of the hearth component is positioned above the lower collecting box 1-2 of the hearth component, two hearth component water outlets 1-12 are arranged at the position, close to the front end, of the upper collecting box 1-1 of the hearth component, two hearth component water inlets 1-13 are arranged at the position, close to the rear end, of the front water cooling wall 1-3 of the hearth component comprises the lower collecting box 1-3-1 of the front water cooling wall of the hearth component and the upper collecting box 1-2 of the front water cooling wall of the hearth component 3-2, a hearth component front water-cooling wall lower header 1-3-1 is arranged in parallel with a hearth component front water-cooling wall upper header 1-3-2, the hearth component front water-cooling wall lower header 1-3-1 is positioned below a hearth component front water-cooling wall upper header 1-3-2, the hearth component front water-cooling wall lower header 1-3-1 is fixedly arranged at the left end of the hearth component lower header 1-2, the hearth component front water-cooling wall lower header 1-3-1 is vertical to the hearth component lower header 1-2, the hearth component front water-cooling wall lower header 1-3-1 is communicated with the hearth component lower header 1-2, the hearth component front water-cooling wall upper header 1-3-2 is fixedly arranged at the left end of the hearth component upper header 1-1, and the hearth component front water-cooling wall upper header 1-3-2 is vertical to the hearth component upper header 1-1 The front water-cooled wall upper header 1-3-2 of the hearth component is communicated with the hearth component upper header 1-1, the rear water-cooled wall 1-4 of the hearth component comprises a rear water-cooled wall lower header 1-4-1 of the hearth component and a rear water-cooled wall upper header 1-4-2 of the hearth component, the rear water-cooled wall lower header 1-4-1 of the hearth component is arranged in parallel with the rear water-cooled wall upper header 1-4-2 of the hearth component, the rear water-cooled wall lower header 1-4-1 of the hearth component is positioned below the rear water-cooled wall upper header 1-4-2 of the hearth component, the rear water-cooled wall lower header 1-4-1 of the hearth component is fixedly arranged at the right end of the rear water-cooled wall lower header 1-2 of the hearth component, and the rear water-cooled wall lower header 1-4-1 of the hearth component is vertical to the rear water-cooled wall lower header 1-2 of the hearth component, the rear water-cooled wall lower header 1-4-1 of the hearth component is communicated with a hearth component lower header 1-2, the rear water-cooled wall upper header 1-4-2 of the hearth component is fixedly arranged at the right end of the upper header 1-1 of the hearth component, the rear water-cooled wall upper header 1-4-2 of the hearth component is vertical to the hearth component upper header 1-1, the rear water-cooled wall upper header 1-4-2 of the hearth component is communicated with the hearth component upper header 1-1, a hearth 1-14 is arranged at the center of the hearth component 1 along the length direction, the hearth 1-14 has the function of ensuring that fuel is combusted as far as possible and the temperature of flue gas at the outlet of the hearth is cooled to the temperature allowed by safe operation of a convection heating surface, the left side outside the hearth 1-14 is provided with a hearth component left membrane wall 1-5, and the left membrane wall 1-5 of the hearth component is composed of a plurality of hearth component tube groups 1-15, and a plurality of hearth component tube groups 1-15 are arranged in parallel, one end of a left membrane wall 1-5 of the hearth component is fixedly connected with a lower hearth component header 1-2, the other end of the left membrane wall 1-5 of the hearth component is fixedly connected with an upper hearth component header 1-1, a right side of the outside of the hearth 1-14 is provided with a right hearth component membrane wall 1-6, the right hearth component membrane wall 1-6 is composed of a plurality of hearth component tube groups 1-15, the plurality of hearth component tube groups 1-15 are arranged in parallel, one end of the right membrane wall 1-6 of the hearth component is fixedly connected with the lower hearth component header 1-2, the other end of the right membrane wall 1-6 of the hearth component is fixedly connected with the upper hearth component header 1-1, one end of each hearth component tube group 1-15 at the inlet of the hearth 1-14 is fixedly arranged with the upper hearth component header 1-1, the other end of each hearth component pipe group 1-15 at the inlet of each hearth 1-14 is fixedly arranged with the lower collecting box 1-2 of each hearth component, each hearth component pipe group 1-15 at the inlet of each hearth 1-14 is arranged around each hearth 1-14, one end of each hearth component pipe group 1-15 at the bottom of each hearth 1-14 is fixedly arranged with the upper collecting box 1-1 of each hearth component, the other end of each hearth component pipe group 1-15 at the bottom of each hearth 1-14 is fixedly arranged with the lower collecting box 1-2 of each hearth component, the tail part of each hearth component 1 is provided with a hearth component smoke outlet 1-11, and the hearth component smoke outlet 1-11 is fixedly connected with the hearth outlet connecting flue 4 of the hearth outlet connecting flue 4 to the smoke inlet end 4 of the hearth connecting flue 4.

The second embodiment is as follows: the embodiment is described by combining fig. 8 and fig. 12, the embodiment describes a large-scale low-nitrogen condensation combined gas boiler using an expansion flue, the hearth outlet connecting flue 4 includes a fire-resistant layer 4-1, an expansion joint 4-2 and an insulating layer 4-3, the fire-resistant layer 4-1 enables the hearth outlet connecting flue 4 to have high-temperature resistant and heat-insulating functions, the expansion joint 4-2 mainly reduces stress generated by steel thermal expansion after a high-temperature pipeline is heated so as not to damage the pipeline or connected equipment, the insulating layer 4-3 enables the hearth outlet connecting flue to retain temperature so as to fully utilize heat, a plurality of gripping nails 4-2-1 are welded on the inner surface of the expansion joint 4-2, the expansion joint 4-2 is fixedly arranged with the fire-resistant layer 4-1 through the gripping nails 4-2-1, the insulating layer 4-3 is arranged on the outer surface of the expansion joint 4-2, and the rest is the same as the first embodiment.

The third concrete implementation mode: the embodiment is described with reference to fig. 12, the fire-resistant layer 4-1 includes fire-resistant concrete 4-1-1 and aluminum silicate fire-resistant fiber felt 4-1-2, the aluminum silicate fire-resistant fiber felt 4-1-2 can effectively isolate the heat radiated from the fire-resistant concrete, protect the expansion joint 4-2 from thermal deformation, the fire-resistant concrete 4-1-1 is provided with a step-shaped expansion joint, the volume of the fire-resistant concrete is increased after being heated, the expansion joint is used for eliminating the deformation of the concrete, releasing the internal force of the concrete and avoiding the concrete from expanding from the inside, the resistance of smoke flowing can be increased by adopting the step-shaped design, the heat-insulating layer 4-3 is aluminum silicate ceramic fiber felt, the temperature of the expansion joint 4-2 is prevented from being transferred to the outer surface, otherwise, the temperature of the hearth outlet connecting flue 4 is too high, and the hearth outlet connecting flue is easy to scald, and the other steps are the same as those of the first embodiment or the second embodiment.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 4 to 7, and the large-sized low-nitrogen condensation combined gas boiler using the expansion flue in the embodiment further includes a furnace component base 1-8, the furnace component base 1-8 is used for fixing the whole furnace component 1, the furnace component base 1-8 is disposed below a furnace component lower header 1-2, the furnace component base 1-8 is located on the ground, the furnace component lower header 1-2 is transversely disposed on an upper surface of the furnace component base 1-8, and the furnace component lower header 1-2 is located at an intermediate position of the furnace component base 1-8, and the rest is the same as the first, second or third embodiment.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 5, the hearth assembly 1 of the embodiment further includes hearth assembly heat-insulating sealing layers 1-7, hearth assembly steel frames 1-9 and hearth assembly guard plates 1-10, the hearth assembly heat-insulating sealing layers 1-7 are used for heat-insulating and sealing the whole hearth assembly 1 to prevent heat waste, the hearth assembly steel frames 1-9 are used for supporting and fixing the whole hearth assembly 1, the hearth assembly guard plates 1-10 are used for protecting the whole hearth assembly 1 to prevent the hearth assembly 1 from being damaged by the outside and prevent the hearth assembly 1 from being damaged and polluting air inside the hearth assembly 1, the hearth assembly heat-insulating sealing layers 1-7 are arranged on the outer side surfaces of the hearth assembly tube groups 1-15 of the hearth assembly 1, the outer surfaces of the hearth component heat-insulating sealing layers 1-7 are provided with hearth component steel frames 1-9, two side surfaces of the hearth component 1 are provided with hearth component guard plates 1-10, the hearth component guard plates 1-10 are arranged on the outer surfaces of the hearth component heat-insulating sealing layers 1-7, and the rest is the same as the first, second, third or fourth specific embodiment.

The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 17, and a large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to the present embodiment, the boiler also comprises a gas collecting tank 5, the gas collecting tank 5 is a connecting part, hot water flows inside, the gas collecting tank 5 is provided with a water inlet and a water outlet, the top of the gas collecting tank 5 is provided with an exhaust pipe joint, the convection assembly 2 comprises an upper drum 2-1 of the convection assembly, a lower drum 2-2 of the convection assembly, a membrane wall 2-3 of the convection assembly, a convection pipe group 2-4, a heat-insulating sealing layer 2-5 of the convection assembly, a base 2-6 of the convection assembly, a steel frame 2-7 of the convection assembly, a protective plate 2-8 of the convection assembly and an internal device 2-9 of the drum;

the convection component bases 2-6 are positioned on the ground, the convection component bases 2-6 are used for fixing the whole convection component 2, the convection component bases 2-6 are arranged below the lower drum (2-2) of the convection component, the lower drum 2-2 of the convection component is transversely arranged on the upper surface of the convection component bases 2-6, the lower drum 2-2 of the convection component is positioned in the middle of the convection component bases 2-6, the upper drum 2-1 of the convection component is arranged in parallel with the lower drum 2-2 of the convection component, the upper drum 2-1 of the convection component is positioned above the lower drum 2-2 of the convection component, two water inlets 2-12 of the convection component are arranged on the upper drum 2-1 of the convection component close to the top end, each water inlet 2-12 of the convection component is connected with each water outlet 1-12 of the hearth component through a first pipeline 6, a convection assembly water outlet 2-13 is arranged on the upper drum 2-1 of the convection assembly near the bottom end, the convection assembly water outlet 2-13 is connected with the air inlet of the gas collecting tank 5, the air outlet of the gas collecting tank 5 is communicated with the outer surface of a water supply pipeline of a boiler room system, drum inner devices 2-9 are respectively arranged at the two ends of the upper drum 2-1 of the convection assembly, drum inner devices 2-9 are respectively arranged at the two ends of the lower drum 2-2 of the convection assembly, a convection assembly membrane wall 2-3 is arranged between the upper drum 2-1 of the convection assembly and the lower drum 2-2 of the convection assembly, the convection assembly membrane wall 2-3 is composed of a plurality of convection tube groups 2-4, a plurality of convection tube groups 2-4 are arranged in parallel, one end of the convection assembly membrane wall 2-3 is fixedly connected with the upper drum 2-1 of the convection assembly, the other end of the convection component membrane wall 2-3 is fixedly connected with a convection component lower drum 2-2, the tail part of the convection component 2 is provided with a convection component flue gas inlet 2-11, the convection component flue gas inlet 2-11 is fixedly connected with a hearth outlet connecting flue smoke outlet end 4-5 of a hearth outlet connecting flue 4, the top part of the convection component 2 is provided with a convection component flue gas outlet 2-10, the outer side surface of the convection pipe group 2-4 is provided with a convection component heat-insulating sealing layer 2-5, the outer surface of the convection component heat-insulating sealing layer 2-5 is provided with a convection component steel frame 2-7, two side surfaces of the convection component 2 are provided with convection component guard plates 2-8, the convection component guard plates 2-8 are arranged on the outer surface of the convection component heat-insulating sealing layer 2-5, and other embodiments I, Two, three, four or five are the same.

The seventh embodiment: the embodiment is described with reference to fig. 18 to 21, and the economizer 3 of the large-scale low-nitrogen condensation combined gas boiler adopting the expansion flue of the embodiment comprises an economizer upper header 3-1, an economizer lower header 3-2, aluminum-clad finned tubes 3-3, an economizer steel frame 3-4, an economizer heat-insulating layer 3-5 and an economizer connecting flue 3-6;

an upper energy saver collecting box 3-1 and a lower energy saver collecting box 3-2 are arranged in parallel, the upper energy saver collecting box 3-1 is arranged above the lower energy saver collecting box 3-2, the bottom end of the upper energy saver collecting box 3-1 is provided with an energy saver water inlet 3-12, the energy saver water inlet 3-12 is fixedly connected with a return water pipeline of a boiler room system, the bottom end of the lower energy saver collecting box 3-2 is provided with two energy saver water outlets 3-11, each energy saver water outlet 3-11 is connected with each hearth component water inlet 1-13 through a second pipeline 7, the upper energy saver collecting box 3-1 is fixedly connected with one end of an aluminum-coated finned tube 3-3, the lower energy saver collecting box 3-2 is fixedly connected with the other end of the aluminum-coated finned tube 3-3, the aluminum-coated finned tubes 3-3 are distributed in the energy saver 3 in a staggered manner, an economizer heat-insulating layer 3-5 is arranged on the outer surface of the aluminum-clad finned tube 3-3, an economizer heat-insulating layer 3-5 is arranged on the outer side surfaces of an economizer upper header 3-1 and an economizer lower header 3-2, an economizer steel frame 3-4 is arranged on the outer surface of the economizer heat-insulating layer 3-5, four support columns are uniformly distributed on the lower surface of the economizer steel frame 3-4, an economizer flue gas inlet 3-8 is arranged at the top end of the economizer 3, the economizer flue gas inlet 3-8 is fixedly connected with an economizer connecting flue gas outlet 3-7 of an economizer connecting flue 3-6, an economizer connecting flue gas inlet 3-10 of the economizer connecting flue 3-6 is fixedly connected with a convection assembly flue gas outlet 2-10, and an economizer flue gas outlet 3-9 is arranged at the bottom end of the economizer 3, the flue gas outlets 3-9 of the economizer are fixedly connected with a chimney, and the others are the same as those of the first, second, third, fourth, fifth or sixth specific embodiment.

Principle of operation

Smoke side: high-temperature flue gas generated by combustion transfers heat to circulating water in the hearth component 1 through radiation heat exchange, the flue gas is transferred to the interior of the convection component 2 from the tail of the hearth component 1 through a hearth outlet connecting flue 4, the heat is transferred to the circulating water through convection heat transfer, the flue gas enters the energy saver 3 through the energy saver connecting flues 3-6 after coming out of the convection component 2, transversely scours the finned tubes, and then enters a chimney to finish the emission of the flue gas.

Circulating water side: boiler room system backwater links to each other with economizer water inlet 3-12 of economizer 3, and circulating water flows in the finned tube inside, with flue gas countercurrent flow heat transfer, economizer delivery port 3-11 is connected with furnace subassembly water inlet 1-13, and furnace subassembly delivery port 1-12 links to each other with convection current subassembly water inlet 2-12, and the circulating water flows in furnace subassembly 1 and convection current subassembly 2 and adopts the water circulation mode of complete forced circulation, absorbs the radiant heat in furnace subassembly 1 inside, absorbs the convection heat transfer in convection current subassembly 2, and high temperature circulating water passes through gas collection tank 5 and gets into boiler room system water supply pipeline at last.

Claims (7)

1. The utility model provides an adopt large-scale low nitrogen condensation combination formula gas boiler of expansion flue which characterized in that: the boiler comprises a hearth component (1), a convection component (2), an economizer (3), a hearth outlet connecting flue (4), a first pipeline (6) and a second pipeline (7);

the convection assembly (2) is arranged on the side face of the hearth assembly (1), a flue gas outlet part of the hearth assembly (1) is fixedly connected with a flue gas inlet part of the convection assembly (2) through a hearth outlet connecting flue (4), a water outlet part of the hearth assembly (1) is fixedly connected with a water inlet part of the convection assembly (2) through a first pipeline (6), the energy saver (3) is arranged above the hearth assembly (1), a water outlet part of the energy saver (3) is connected with a water inlet part of the hearth assembly (1) through a second pipeline (7), and a flue gas outlet part of the convection assembly (2) is connected with a flue gas inlet part of the energy saver (3) through a connecting flue;

the hearth component (1) comprises an upper hearth component collection box (1-1), a lower hearth component collection box (1-2), a front hearth component water-cooling wall (1-3), a rear hearth component water-cooling wall (1-4), a left hearth component membrane wall (1-5) and a right hearth component membrane wall (1-6);

the hearth component upper header (1-1) and the hearth component lower header (1-2) are arranged in parallel, the hearth component upper header (1-1) is positioned above the hearth component lower header (1-2), two hearth component water outlets (1-12) are arranged at the position of the hearth component upper header (1-1) close to the front end, two hearth component water inlets (1-13) are arranged at the position of the hearth component upper header (1-1) close to the rear end, the hearth component front water wall (1-3) comprises a hearth component front water wall lower header (1-3-1) and a hearth component front water wall upper header (1-3-2), the hearth component front water wall lower header (1-3-1) and the hearth component front water wall upper header (1-3-2) are arranged in parallel, the hearth component front water-cooled wall lower header (1-3-1) is positioned below the hearth component front water-cooled wall upper header (1-3-2), the hearth component front water-cooled wall lower header (1-3-1) is fixedly arranged at the left end of the hearth component lower header (1-2), the hearth component front water-cooled wall lower header (1-3-1) is vertical to the hearth component lower header (1-2), the hearth component front water-cooled wall lower header (1-3-1) is communicated with the hearth component lower header (1-2), the hearth component front water-cooled wall upper header (1-3-2) is fixedly arranged at the left end of the hearth component upper header (1-1), and the hearth component front water-cooled wall upper header (1-3-2) is vertical to the hearth component upper header (1-1), the front water-cooled wall upper header (1-3-2) of the hearth component is communicated with the hearth component upper header (1-1), the rear water-cooled wall (1-4) of the hearth component comprises a rear water-cooled wall lower header (1-4-1) of the hearth component and a rear water-cooled wall upper header (1-4-2) of the hearth component, the rear water-cooled wall lower header (1-4-1) of the hearth component is arranged in parallel with the rear water-cooled wall upper header (1-4-2) of the hearth component, the rear water-cooled wall lower header (1-4-1) of the hearth component is positioned below the rear water-cooled wall upper header (1-4-2) of the hearth component, the rear water-cooled wall lower header (1-4-1) of the hearth component is fixedly arranged at the right end of the rear water-cooled wall upper header (1-2) of the hearth component, and the rear water-cooled wall lower header (1-4-1) of the hearth component is vertical to the rear water-cooled wall upper header (1-2) of the hearth component, the hearth component rear water-cooled wall lower header (1-4-1) is communicated with the hearth component lower header (1-2), the hearth component rear water-cooled wall upper header (1-4-2) is fixedly arranged at the right end of the hearth component upper header (1-1), the hearth component rear water-cooled wall upper header (1-4-2) is perpendicular to the hearth component upper header (1-1), the hearth component rear water-cooled wall upper header (1-4-2) is communicated with the hearth component upper header (1-1), the center of the hearth component (1) is provided with a hearth (1-14) along the length direction, the left side of the outside of the hearth (1-14) is provided with a hearth component left membrane wall (1-5), the hearth component left membrane wall (1-5) is composed of a plurality of hearth component tube groups (1-15), and a plurality of hearth component tube groups (1-15) are arranged in parallel, one end of a left membrane wall (1-5) of the hearth component is fixedly connected with a lower collecting box (1-2) of the hearth component, the other end of the left membrane wall (1-5) of the hearth component is fixedly connected with an upper collecting box (1-1) of the hearth component, a right membrane wall (1-6) of the hearth component is arranged on the right side outside the hearth (1-14), the right membrane wall (1-6) of the hearth component is composed of a plurality of hearth component tube groups (1-15), the plurality of hearth component tube groups (1-15) are arranged in parallel, one end of the right membrane wall (1-6) of the hearth component is fixedly connected with the lower collecting box (1-2) of the hearth component, the other end of the right membrane wall (1-6) of the hearth component is fixedly connected with the upper collecting box (1-1) of the hearth component, one end of each hearth component pipe group (1-15) at the inlet of each hearth (1-14) is fixedly arranged with the upper header (1-1) of each hearth component, the other end of each hearth component pipe group (1-15) at the inlet of each hearth (1-14) is fixedly arranged with the lower header (1-2) of each hearth component, each hearth component pipe group (1-15) at the inlet of each hearth (1-14) is arranged around each hearth (1-14), one end of each hearth component pipe group (1-15) at the bottom of each hearth (1-14) is fixedly arranged with the upper header (1-1) of each hearth component, the other end of each hearth component pipe group (1-15) at the bottom of each hearth (1-14) is fixedly arranged with the lower header (1-2) of each hearth component, the tail of each hearth component (1) is provided with a flue gas outlet (1-11) of each hearth component, the hearth component smoke outlets (1-11) are fixedly connected with the hearth outlet connecting flue (4) of the hearth outlet connecting flue (4) through the smoke inlet end (4-4) of the flue.

2. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 1, wherein: the hearth outlet connecting flue (4) comprises a fire-resistant layer (4-1), an expansion joint (4-2) and a heat-insulating layer (4-3), a plurality of grabbing nails (4-2-1) are welded on the inner surface of the expansion joint (4-2), the expansion joint (4-2) is fixedly arranged with the fire-resistant layer (4-1) through the grabbing nails (4-2-1), and the heat-insulating layer (4-3) is arranged on the outer surface of the expansion joint (4-2).

3. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 2, wherein: the fire-resistant layer (4-1) comprises fire-resistant concrete (4-1-1) and an aluminum silicate fire-resistant fiber felt (4-1-2), the fire-resistant concrete (4-1-1) is provided with a step-shaped expansion gap, and the heat-insulating layer (4-3) is an aluminum silicate ceramic fiber felt.

4. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 1, wherein: the hearth component (1) further comprises a hearth component base (1-8), the hearth component base (1-8) is located on the ground, the hearth component base (1-8) is arranged below the hearth component lower header (1-2), the hearth component lower header (1-2) is transversely arranged on the upper surface of the hearth component base (1-8), and the hearth component lower header (1-2) is located in the middle of the hearth component base (1-8).

5. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 1, wherein: the hearth component (1) further comprises hearth component heat-insulating sealing layers (1-7), hearth component steel frames (1-9) and hearth component protective plates (1-10), wherein hearth component heat-insulating sealing layers (1-7) are arranged on the outer side surfaces of the hearth component tube groups (1-15) of the hearth component (1), the hearth component steel frames (1-9) are arranged on the outer surfaces of the hearth component heat-insulating sealing layers (1-7), the hearth component protective plates (1-10) are arranged on two side surfaces of the hearth component (1), and the hearth component protective plates (1-10) are arranged on the outer surfaces of the hearth component heat-insulating sealing layers (1-7).

6. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 1, wherein: the boiler also comprises a gas collecting tank (5), the convection assembly (2) comprises a convection assembly upper drum (2-1), a convection assembly lower drum (2-2), a convection assembly membrane wall (2-3), a convection pipe group (2-4), a convection assembly heat-insulating sealing layer (2-5), a convection assembly base (2-6), a convection assembly steel frame (2-7), a convection assembly protective plate (2-8) and a drum inner device (2-9);

the convection assembly base (2-6) is positioned on the ground, the convection assembly base (2-6) is arranged below the convection assembly lower drum (2-2), the convection assembly lower drum (2-2) is transversely arranged on the upper surface of the convection assembly base (2-6), the convection assembly lower drum (2-2) is positioned in the middle of the convection assembly base (2-6), the convection assembly upper drum (2-1) is arranged in parallel with the convection assembly lower drum (2-2), the convection assembly upper drum (2-1) is positioned above the convection assembly lower drum (2-2), the convection assembly upper drum (2-1) is provided with two convection assembly water inlets (2-12) close to the top end, each convection assembly water inlet (2-12) is connected with each hearth assembly water outlet (1-12) through a first pipeline (6), a convection assembly water outlet (2-13) is arranged on the upper drum (2-1) of the convection assembly close to the bottom end, the convection assembly water outlet (2-13) is connected with the air inlet of the gas collecting tank (5), the air outlet of the gas collecting tank (5) is communicated with the outer surface of a boiler room system water supply pipeline, two ends of the upper drum (2-1) of the convection assembly are respectively provided with a drum internal device (2-9), two ends of the lower drum (2-2) of the convection assembly are respectively provided with a drum internal device (2-9), a convection assembly membrane wall (2-3) is arranged between the upper drum (2-1) of the convection assembly and the lower drum (2-2) of the convection assembly, the convection assembly membrane wall (2-3) is composed of a plurality of convection tube groups (2-4), and the plurality of convection tube groups (2-4) are arranged in parallel, one end of a convection component membrane wall (2-3) is fixedly connected with an upper drum (2-1) of the convection component, the other end of the convection component membrane wall (2-3) is fixedly connected with a lower drum (2-2) of the convection component, the tail part of the convection component (2) is provided with a convection component flue gas inlet (2-11), the convection component flue gas inlet (2-11) is fixedly connected with a hearth outlet connecting flue (4-5) of a hearth outlet connecting flue (4), the top part of the convection component (2) is provided with a convection component flue gas outlet (2-10), the outer side surface of a convection pipe group (2-4) is provided with a convection component heat-insulating sealing layer (2-5), the outer surface of the convection component heat-insulating sealing layer (2-5) is provided with a convection component steel frame (2-7), convection component guard plates (2-8) are arranged on two side faces of the convection component (2), and the convection component guard plates (2-8) are arranged on the outer surfaces of the convection component heat-insulation sealing layers (2-5).

7. A large-sized low-nitrogen condensing combined gas boiler using an expansion flue according to claim 1, wherein: the energy saver (3) comprises an energy saver upper collection box (3-1), an energy saver lower collection box (3-2), an aluminum-coated finned tube (3-3), an energy saver steel frame (3-4), an energy saver heat insulation layer (3-5) and an energy saver connecting flue (3-6);

an upper energy saver collecting box (3-1) and a lower energy saver collecting box (3-2) are arranged in parallel, the upper energy saver collecting box (3-1) is arranged above the lower energy saver collecting box (3-2), the bottom end of the upper energy saver collecting box (3-1) is provided with an energy saver water inlet (3-12), the energy saver water inlet (3-12) is fixedly connected with a return water pipeline of a boiler room system, the bottom end of the lower energy saver collecting box (3-2) is provided with two energy saver water outlets (3-11), each energy saver water outlet (3-11) is connected with each hearth component water inlet (1-13) through a second pipeline (7), the upper energy saver collecting box (3-1) is fixedly connected with one end of an aluminum-coated finned tube (3-3), the lower energy saver collecting box (3-2) is fixedly connected with the other end of the aluminum-coated finned tube (3-3), the aluminum-coated finned tubes (3-3) are distributed in the energy saver (3) in a staggered manner, the outer surfaces of the aluminum-coated finned tubes (3-3) are provided with energy saver heat preservation layers (3-5), the outer surfaces of the energy saver upper collection box (3-1) and the energy saver lower collection box (3-2) are respectively provided with the energy saver heat preservation layers (3-5), the outer surface of the energy saver heat preservation layer (3-5) is provided with an energy saver steel frame (3-4), four support columns are uniformly distributed on the lower surface of the energy saver steel frame (3-4), the top end of the energy saver (3) is provided with an energy saver flue gas inlet (3-8), the energy saver flue gas inlet (3-8) is fixedly connected with an energy saver connecting flue gas outlet (3-7) of the energy saver connecting flue (3-6), the energy saver connecting flue gas inlet (3-10) of the flue gas inlet and a convection flue gas outlet of the energy saver smoke assembly The ports (2-10) are fixedly connected, the bottom end of the economizer (3) is provided with an economizer flue gas outlet (3-9), and the economizer flue gas outlet (3-9) is fixedly connected with a chimney.

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