Large garbage waste heat furnace structure

Abstract

The utility model relates to the technical field of garbage furnaces, in particular to a large garbage waste heat furnace structure which can reduce the temperature of high-temperature superheated flue gas so as to reduce the corrosion rate, is small in transformation degree and easy to realize, and comprises a fire grate, a hearth, a second flue, a third flue, a horizontal flue and a tail flue, a first evaporator, a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater are sequentially arranged in the horizontal flue in the flue gas direction, and flag type evaporators are installed in the second flue and the third flue. A space is reserved between the high-temperature superheater in the horizontal flue and the first evaporator, a second evaporator is arranged in the space, and the number of the low-temperature superheaters is reduced to one group.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage furnaces, in particular to a large-scale garbage waste heat furnace structure. Background Art

[0002] In order to treat domestic waste harmlessly, a large number of waste incineration plants have been newly built over a period of time. Waste heat boilers are the main equipment in these plants, and the operation of these equipment is directly related to the stability of the entire system.

[0003] When waste incineration plants were first established, the calorific value of domestic waste was generally low. In order to adapt to the characteristics of the fuel, the furnace of the waste heat boiler was relatively small and there were more superheaters. With the development of the economy, people's living standards have generally improved, waste classification has become more and more common, and the calorific value of domestic waste has also been increasing. Theoretically, to treat the same tonnage of domestic waste, a higher calorific value fuel requires a larger furnace than a lower calorific value fuel to achieve the purpose of lowering the flue gas temperature; however, compared with boilers using low calorific value fuels, the number of superheaters can be reduced. The existing structure of waste heat boilers is as follows: Figure 1 As shown, the first evaporator 2, the high-temperature superheater 3, the medium-temperature superheater 4, and two groups of low-temperature superheaters 5 are arranged in sequence in the horizontal flue 1 along the flue gas direction. With the change of fuel characteristics, if the existing waste heat boiler is not adjusted, it will lead to a series of problems such as high boiler flue gas temperature, overheating of the superheater, and high-temperature corrosion. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a large-scale garbage waste heat furnace structure, which can reduce the temperature of high-temperature overheated flue gas and thus reduce the corrosion rate, has a small degree of modification and is easy to implement.

[0005] The technical solution is as follows: a large-scale garbage waste heat furnace structure, which includes a grate, a furnace, a second flue, a third flue, a horizontal flue and a tail flue, in which a first evaporator, a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater are arranged in sequence along the direction of flue gas in the horizontal flue, characterized in that flag-type evaporators are installed in the second flue and the third flue, a space is left between the high-temperature superheater in the horizontal flue and the first evaporator and a second evaporator is arranged, and the low-temperature superheater is reduced to one group.

[0006] Its further feature is that a support member and an expansion limiter matched with the flag-type evaporator are respectively arranged in the second flue and the third flue.

[0007] After adopting the utility model, due to the addition of three groups of evaporators, the smoke temperature generated after the same fuel input heat is increased can greatly reduce the overall smoke temperature field at the horizontal flue after passing through the evaporation heating surface, and the smoke temperature of the high-temperature superheater is reduced, thereby reducing the corrosion rate. In addition, the internal changes of the garbage waste heat furnace are small. It is only necessary to move the high-temperature superheater and the medium-temperature superheater backward in the horizontal flue, which is easy to transform and realize. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of a waste heat furnace in the prior art;

[0009] Figure 2 This is a schematic diagram of the structure of the waste heat furnace of the utility model;

[0010] Figure 3 for Figure 2 Enlarged schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0011] See Figure 2 , Figure 3 As shown, a large-scale garbage waste heat furnace structure includes a grate 7, a furnace 8, a second flue 9, a third flue 10, a horizontal flue 1 and a tail flue 11. The first evaporator 2, the second evaporator 6, the high-temperature superheater 3, the medium-temperature superheater 4 and the low-temperature superheater 5 are arranged in sequence along the flue gas direction in the horizontal flue 1. In order to arrange the second evaporator 6, flag-type evaporators 12 are installed in the second flue 9 and the third flue 10. The high-temperature superheater 3 and the medium-temperature superheater 4 need to be moved back a distance to leave space for arrangement, and the low-temperature superheater 5 is reduced from the original two groups to one group.

[0012] When the heat input of the same fuel increases, the flue gas temperature will increase. The flue gas temperature before the high-temperature superheater must be reduced to an appropriate temperature. According to the actual operation, when using high calorific value fuel, the amount of cooling water is generally too large, which means that the superheater area is too large. Add flag-type evaporators to the second and third flues, move the high-temperature superheater and medium-temperature superheater at the entrance of the horizontal flue backward, reduce one group of low-temperature superheaters, and replace the original high-temperature superheater with an added evaporator. Since the added and replaced heating surface is the evaporation heating surface, the overall flue gas temperature field at the horizontal flue can be greatly reduced, the corrosion of the high-temperature superheater is reduced, and excessive water spraying is avoided, overcoming the problem of insufficient renovation space.

[0013] A support member 13 and an expansion limiter 14 cooperating with the flag-type evaporator 12 are respectively arranged in the second flue 9 and the third flue 10, wherein the support member 13 is a support plate with an arc-shaped groove and is connected to the side wall of the flue by using angle steel, and the expansion limiter 14 includes a vertical piece fixed to the side of the flag-type evaporator 12 and a seat body fixed to the side wall of the flue and provided with a limiting groove, and the vertical piece is limited by the seat body.

Claims

1. A large-scale waste heat furnace structure, comprising a grate, a furnace, a second flue, a third flue, a horizontal flue and a tail flue, wherein a first evaporator, a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater are arranged in sequence in the horizontal flue along the direction of flue gas, characterized in that: Flag-type evaporators are installed in the second flue and the third flue, a space is left between the high-temperature superheater in the horizontal flue and the first evaporator and a second evaporator is arranged therein, and the low-temperature superheater is reduced to one group.

2. A large garbage waste heat furnace structure according to claim 1, characterized in that: The second flue and the third flue are respectively provided with a support member and an expansion limiter matched with the flag-type evaporator.

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