Connecting flue from superheater to boiler body in left and right steam boilers

Abstract

The utility model discloses a connecting flue from a superheater to a boiler body in a left steam boiler and a right steam boiler, and belongs to the technical field of boilers. The boiler flue comprises a flue body arranged between a superheater and a boiler body, wherein the flue body is sequentially provided with a steel frame outer package, a heat preservation layer and a boiler body membrane wall from outside to inside; a collecting box is arranged in the heat preservation layer. A boiler body membrane type wall is used for absorbing smoke heat in the flue body, and refractory concrete is arranged on the boiler body membrane type wall. The membrane wall structure is adopted, so that the heating surface of the boiler body is enlarged, and steam generated by the boiler can be further heated to an overheating temperature; heat loss is reduced, heat insulation materials are filled in the connecting flue, refractory concrete is poured, the loss of combustion heat can be effectively reduced, and the heat efficiency of the boiler is improved; and normal operation of the boiler is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, specifically relating to a connecting flue from the superheater to the boiler body in a left-right two-body steam boiler. Background Technology

[0002] With the development of society and economy and increasingly stringent environmental protection requirements, traditional coal-fired boilers have been gradually restricted due to pollution emissions and other issues, while oil and gas-fired steam boilers have been more widely used due to their relatively clean and efficient characteristics.

[0003] In existing technologies, some users' production processes require superheated steam, and superheaters can further heat saturated steam into superheated steam, increasing its enthalpy. To ensure the superheated steam temperature, serpentine tube superheaters are typically used. This facilitates the full absorption of heat from the flue gas, raising the steam's superheat temperature and ensuring it reaches that temperature. This structure is suitable for high-temperature, high-pressure environments. For prefabricated steam boilers, due to transportation limitations, the superheater and the main body are manufactured as two separate modules connected by a flue.

[0004] like Figure 1 The diagram shows the existing structure of the flue connecting the boiler body and the superheater. The existing insulation between the boiler body and the superheater typically uses a steel sealing shell filled with insulating bricks (30), aluminum silicate fiberboard (20), and high-temperature glass wool board (10). The insulating bricks on the left side of the superheater (40) are in constant contact with high-temperature flue gas, and the outer steel frame (50) cannot be effectively protected and cooled. Prolonged exposure to high-temperature flue gas radiation will inevitably lead to cracks in the insulation wall over time, and in severe cases, the wall may even detach. This not only results in energy loss but also affects the stable and safe operation of the boiler. Utility Model Content

[0005] In response to the problems in the prior art mentioned in the background section, this utility model proposes a connecting flue from the superheater to the boiler body in a two-body steam boiler. It adopts a membrane wall structure, which facilitates furnace construction, increases the heating surface of the boiler body, maintains stable temperature in the connecting flue, enhances insulation efficiency, and reduces the loss of combustion heat. It also effectively prevents the furnace wall from collapsing due to prolonged high temperature conditions, ensuring the normal operation of the boiler.

[0006] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] The utility model provides a kind of left and right two steam boiler superheater to the connection flue of boiler body, including the flue body being arranged between superheater and boiler body, the flue body is sequentially provided with steel frame outer package, heat preservation layer and boiler body membrane wall from outside to inside;Casing is arranged in the heat preservation layer;Boiler body membrane wall is used to absorb the heat of flue gas in flue body, and the boiler body membrane wall is provided with refractory concrete.

[0008] As preferred, the superheater is made of multiple seamless steel pipes bent into serpentine pipes, and the superheater is fixedly connected with the casing at the port.

[0009] As preferred, the heat preservation layer is made of aluminum silicate fiber board or high-temperature glass wool felt.

[0010] As preferred, the boiler body membrane wall includes water-cooled pipes, which are evenly distributed on both sides of the heat preservation layer.

[0011] As preferred, the flue body is provided with an inlet pipe and an outlet pipe at the lower end, and the inlet pipe and the outlet pipe are arranged in the heat preservation layer and connected with the water-cooled pipes.

[0012] As preferred, the inlet pipe and the outlet pipe are both cast with refractory concrete.

[0013] Advantages: Compared with the prior art, the utility model has the following advantages:

[0014] (1) The utility model uses membrane wall structure, increases the heating surface of the boiler body, so that the steam generated by the boiler can be further heated to superheating temperature; reduces heat loss and improves the thermal efficiency of the boiler; compared with the traditional method of filling heat preservation material in the inner side of the steel sealing shell, casting refractory concrete can effectively reduce the loss of combustion heat and avoid the problem of heat preservation wall collapse under high temperature for a long time, and ensure the normal operation of the boiler.

[0015] (2) The connecting flue of the utility model is arranged between the superheater and the boiler body, and the flue gas enters the connecting flue, and heat exchange is carried out by means of the water-cooled pipes, so as to significantly reduce the temperature of the flue gas inside the flue. This not only reduces the temperature inside the flue, effectively protects the heat preservation layer, refractory concrete and steel frame outer package, and reduces the temperature inside, but also stores heat in the form of hot water, achieving the dual benefits of energy saving and consumption reduction.

[0016] (3) The boiler body membrane wall of the utility model is constructed by water-cooled pipes, inlet pipes and outlet pipes; the inlet pipe delivers the inflowing cold water to the water-cooled pipes, so that the cold water is uniformly dispersed and absorbs heat, and then the water is discharged through the outlet pipe, which has a delicate and reasonable structure design.

[0017] (4) The heat preservation in the utility model can be integrally made in the factory, which can effectively ensure the production quality and eliminate the hidden troubles caused by the installation conditions and construction space limitations on site; the modular setting also reduces the installation work on site, and compared with the prior art, the utility model is beneficial to the safe and economic operation of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a top view of the existing connecting flue structure from the superheater to the body in the steam boiler;

[0019] Figure 2 is a side view of the existing connecting flue structure from the superheater to the body in the steam boiler;

[0020] Figure 3 is a top view of the connecting flue structure from the superheater to the boiler body in the left-right two-body steam boiler of the utility model;

[0021] Figure 4 is a side view of the connecting flue structure from the superheater to the boiler body in the left-right two-body steam boiler of the utility model;

[0022] Wherein, 1, steel frame outer package; 2, heat preservation layer; 3, boiler body membrane wall; 4, superheater; 5, water-cooled pipe. DETAILED DESCRIPTION

[0023] The utility model will be further illustrated in combination with specific embodiments, and the embodiments are implemented on the premise of the technical scheme of the utility model, and it should be understood that the embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0024] As shown in Figure 1 , Figure 2 , the connecting flue from the superheater to the boiler body is the existing connecting flue, and the connecting flue is sequentially the superheater, the heat preservation brick, the aluminum silicate fiber board, the high-temperature glass wool felt and the steel frame outer package from inside to outside. The flue structure is three layers of heat preservation in total. Most of the connecting flue is built in the factory, which is not only complicated in process, but also needs to spend a lot of manpower and material resources.

[0025] As shown in Figure 3 , Figure 4 , the connecting flue from the superheater to the boiler body in the left-right two-body steam boiler provided by the embodiment mainly comprises a flue body, and the flue body is arranged between the superheater 4 and the boiler body.

[0026] The flue body is sequentially provided with a steel frame outer package 1, a heat preservation layer 2 and a boiler body membrane wall 3 from outside to inside; the superheater 4 is arranged in the boiler body membrane wall 3, the boiler body membrane wall is used for absorbing the heat of flue gas in the flue body, and the boiler body membrane wall 3 is poured with refractory concrete.

[0027] In the embodiment, the superheater 4 is formed by welding a plurality of seamless steel pipes bent into a serpentine pipe and header tanks at both ends; the header tanks are arranged in the thermal insulation layer 2.

[0028] In the embodiment, the thermal insulation layer 2 is an aluminum silicate fiber board or high-temperature glass wool felt.

[0029] The principle of thermal insulation of the aluminum silicate fiber board is that due to its high porosity, the gas is divided into small silo, which forms a heat shield barrier to prevent heat transfer. Moreover, it has small density and light weight. The principle of thermal insulation of the high-temperature glass wool felt is that a large number of micro-pores are formed by its internal fiber structure, which can effectively hinder the transfer of heat, thereby achieving the effect of thermal insulation. Glass wool belongs to a category of glass fibers, which has the characteristics of good forming, small bulk density, low thermal conductivity, good thermal insulation, good sound absorption performance, corrosion resistance, and stable chemical properties.

[0030] In the embodiment, water-cooled pipes 5 vertically arranged on the thermal insulation layer 2 are arranged on both sides of the membrane wall of the boiler body, and the water-cooled pipes 5 are vertically and uniformly arranged, and the water-cooled pipes 5 are correspondingly embedded in the left and right side walls of the thermal insulation layer 2.

[0031] The inlet pipe and the outlet pipe are arranged at the lower end of the flue body, and the inlet pipe and the outlet pipe are arranged in the thermal insulation layer, and the inlet pipe and the outlet pipe are connected with the water-cooled pipes 5; water enters the water-cooled pipes 5 from the inlet pipe, and then enters the outlet pipe from the water-cooled pipes 5 to realize water-cooled heat exchange.

[0032] In the embodiment, the outer side of the inlet pipe and the outlet pipe is poured with refractory concrete.

[0033] After the flue gas enters the connecting flue, heat exchange is carried out by means of the water-cooled pipes, thereby significantly reducing the temperature of the flue gas inside the flue body. This not only reduces the temperature inside the flue body, effectively protects the thermal insulation layer 2, the refractory concrete and the steel frame outer package 1, but also stores heat in the form of hot water, heats and insulates the water vapor flowing in the superheater 4 pipe, and increases the temperature of the water vapor, thereby increasing the output steam temperature and pressure of the boiler; achieving the dual benefits of energy saving and consumption reduction.

[0034] The membrane wall of the boiler body in the embodiment is formed by the water-cooled pipes and the inlet pipe and the outlet pipe running upward and downward. The inlet pipe transports the inflowing cold water to the vertical water-cooled pipes on both sides, so that the water body is uniformly dispersed and absorbs heat, and then realizes drainage through the upper outlet pipe, which has a delicate and reasonable structure design.

[0035] In the embodiment, the water-cooled pipes in the membrane wall of the boiler body are composed of 20G GB / T5310 seamless steel pipes, and the header tank specifications are φ159x16, and the selected material is 20G GB / T5310.

[0036] The boiler body inlet is arranged with a pull-out pipe bundle, flue gas passes through the furnace, the pull-out pipe bundle, the radiation cooling chamber, the pull-out pipe into the bulk of the boiler body, high-temperature flue gas passes through the high-temperature superheater, the low-temperature superheater, the high-temperature economizer, enters the low-temperature economizer through the connecting flue, and is discharged after being reduced to the exhaust gas temperature by the condenser and then is discharged into the atmosphere through the chimney.

[0037] The superheater is placed in the membrane wall 3 of the boiler body, steam is introduced into the low-temperature superheater inlet header through the communicating pipe header from the upper drum, passes through the low-temperature superheater serpentine pipe, enters the low-temperature superheater outlet header, and then enters the water spray desuperheater to adjust the steam temperature and then enters the high-temperature superheater inlet header, passes through the high-temperature superheater serpentine pipe, and then enters the high-temperature superheater outlet header, is introduced into the header through the pipeline, and finally enters the heat utilization equipment.

[0038] The working principle or use process of the utility model is as follows: the discharged high-temperature and high-pressure water vapor is introduced into the superheater 4 pipeline, flue gas generated by the furnace combustion enters the connecting flue from the smoke outlet at the tail of the furnace, and heat exchange is carried out by means of the water cooling pipe, so as to reduce the flue gas temperature inside the flue body, protect the thermal insulation layer and the refractory concrete, and the heat can also be stored in the form of hot water, the water vapor flowing in the superheater 4 pipeline is heated and insulated (heat transfer), the water vapor temperature is increased, so that the output steam temperature and pressure of the boiler are improved; finally, the double benefits of energy saving and consumption reduction are achieved.

[0039] Compared with the structure of the connecting flue, only one layer of thermal insulation is needed, and a circle of boiler body membrane wall is arranged in the thermal insulation layer, the refractory concrete is cast on the boiler body membrane wall, the heating area of the boiler body is increased, and the heat exchange efficiency of the superheater is improved; the thermal insulation performance of the furnace wall is greatly improved, heat loss is reduced, cost is saved, the process and time of building the furnace are shortened, and the waste of manpower and material resources is also reduced.

[0040] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A connecting flue from the superheater to the boiler body in a two-body steam boiler, comprising a flue body disposed between the superheater (4) and the boiler body, characterized in that: The flue body is provided with a steel frame outer casing (1), an insulation layer (2) and a boiler body membrane wall (3) from the outside to the inside; a header is provided inside the insulation layer (2); the boiler body membrane wall (3) absorbs the heat of the flue gas in the flue body, and the boiler body membrane wall (3) is provided with refractory concrete.

2. The connecting flue from the superheater to the boiler body in the left and right dual-body steam boiler according to claim 1, characterized in that: The superheater (4) is a serpentine tube made of multiple seamless steel pipes, and the port of the superheater (4) is fixedly connected to the header.

3. The connecting flue from the superheater to the boiler body in the left and right dual-body steam boiler according to claim 1, characterized in that: The insulation layer (2) is made of aluminum silicate fiberboard or high-temperature glass wool felt.

4. The connecting flue from the superheater to the boiler body in the left and right dual-body steam boiler according to claim 1, characterized in that: The boiler body membrane wall (3) includes water-cooled pipes (5), which are evenly distributed on both sides of the insulation layer (2).

5. The connecting flue from the superheater to the boiler body in the left and right dual-body steam boiler according to claim 1, characterized in that: A water inlet pipe and a water outlet pipe are respectively provided at the lower end of the flue body. Both the water inlet pipe and the water outlet pipe are set inside the insulation layer (2), and both the water inlet pipe and the water outlet pipe are connected to the water cooling pipe (5).

6. The connecting flue from the superheater to the boiler body in the left and right dual-body steam boiler according to claim 1, characterized in that: Refractory concrete was poured on the outside of both the inlet and outlet pipes.

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