Heating device of steam calcining furnace

Abstract

The utility model relates to the field of soda ash production, and discloses a heating device of a steam calcining furnace, which comprises a steam shaft, the steam shaft is provided with a steam inlet space and a drainage space, a plurality of heating pipe components are symmetrically arranged on two sides of the steam shaft, and a plurality of steam inlet pipes are symmetrically communicated with two sides of the steam inlet space of the steam shaft. The end, away from the steam shaft, of each steam inlet pipe is communicated with a steam inlet ring chamber, the other end of each steam inlet ring chamber is communicated with one end of a heating pipe assembly, the other end of each heating pipe assembly is communicated with one end of a drainage ring chamber, and the other end of each drainage ring chamber is communicated with one end of a drainage space of the steam shaft through a drainage pipe. The device provided by the utility model has better heat transfer efficiency.

Description

Technical Field

[0001] The utility model relates to the field of soda ash production, in particular to a heating device for a steam calciner. Background Art

[0002] The steam calciner is a core device in the soda ash industry. It calcines (heats) the materials (2NaHCO3) in the furnace through a steam heating device to produce soda ash (Na2CO3), water vapor and CO2. The heating device is a key component of the calciner, and its performance has a great impact on the output and efficiency of the furnace. Traditional heating devices, such as Figure 1 shown, its design concept is condensation heat transfer, and the working mode is that steam and condensed water flow reversely in the heating tubes. The heating device includes heating tubes 1, 2, 3, non-condensable gas small tubes 4, 5, 6, a flat steam chamber 7, a non-condensable gas exhaust ring chamber 8, a steam inlet pipe 9, a traditional steam shaft 10, a drain pipe 11, etc., which form a structure similar to a shell-and-tube heat exchanger. The installation slope of the entire furnace body is 1.6 - 2%, with the furnace head high and the furnace tail low. Its working process is as follows: Steam enters the heating tube group 1, 2, 3 from the flat steam chamber 7 at the furnace tail, flows towards the furnace head. After heat exchange, the steam condenses into water. Under the action of gravity, the condensed water in the heating tube group 1, 2, 3 flows from the furnace head to the furnace tail, returns to the flat steam chamber 7, and is discharged through the drain pipe 11. In the heat transfer process of this method, before the steam enters the heating tube, there is air in the heating tube itself, and at the same time, the steam contains oxygen. In this way, the non-condensable gas formed will gradually accumulate from less to more at the high end of the heating tube (near the heating tube plug) at the furnace head. Because the non-condensable gas cannot be discharged to the furnace tail under the action of gravity, the section of the heating tube containing the non-condensable gas loses its heat exchange function. Therefore, all traditional heating devices are specifically provided with small steel pipes 4, 5, 6 with a diameter of 15 mm in the heating tubes to remove non-condensable gas. The steel pipe is installed from the plug end of the heating tube all the way to the tail flat steam chamber 7 and passes through the steam chamber and merges into the non-condensable gas ring chamber 8, and the non-condensable gas remaining at the high position of the heating tube is discharged to the non-condensable gas ring chamber 8 under the pressure of the steam and then discharged into the air.

[0003] For example, the utility model with the publication (announcement) number: CN201027171Y discloses a heating device for a steam calciner, including a steam shaft and a number of heating tubes. The steam shaft has a steam inlet space and a drainage space, and also includes a steam inlet ring chamber and a drainage ring chamber. The steam inlet ring chamber is communicated with the steam inlet space of the steam shaft through a steam inlet pipe. The steam inlet end of the heating tube is communicated with the steam inlet ring chamber, and the steam outlet end is communicated with the drainage ring chamber. The drainage ring chamber is communicated with the drainage space of the steam shaft through a drain pipe.

[0004] The device of the above-mentioned utility model is provided with a plurality of heating pipes arranged in parallel. One of the heating pipes with its furnace head ends connected in parallel has its furnace tail end connected to the intake air annular chamber end, and the furnace tail ends of the remaining heating pipes are connected to the drainage annular chamber end. After the steam enters from the furnace head end of one of the heating pipes, due to the plurality of heating pipes arranged in parallel, part of the steam will directly enter the drainage annular chamber through one of the heating pipes with its furnace tail end connected to the drainage annular chamber end. This results in different operating paths of the steam in each heating pipe and different heat transfer effects. At the same time, for the heating pipe structure of the above-mentioned utility model, the operating path of the steam in the heating pipe is short and the heat transfer effect is not good. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a heating device for a steam calcination furnace to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the present utility model provides the following technical solution: A heating device for a steam calcination furnace includes a steam shaft. The steam shaft is provided with an intake air space and a drainage space, and a number of heating pipe assemblies are symmetrically arranged on both sides of the steam shaft. On both sides of the intake air space of the steam shaft, a number of intake air pipes are symmetrically connected. One end of each intake air pipe away from the steam shaft is respectively connected to an intake air annular chamber. The other end of each intake air annular chamber is respectively connected to one end of a heating pipe assembly, and the other end of each heating pipe assembly is respectively connected to one end of a drainage annular chamber. The other end of each drainage annular chamber is respectively connected to one end of the drainage space of the steam shaft through a drainage pipe.

[0007] Preferably: Each of the heating pipe assemblies includes a heating annular pipe connected to one end of the intake air annular chamber.

[0008] Preferably: The end of the heating annular pipe away from the intake air annular chamber is connected to one end of a heating straight pipe.

[0009] Preferably: The other end of each heating straight pipe is respectively connected to one end of the drainage annular chamber.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] In the present utility model, after the steam enters from the intake air space of the steam shaft, it enters the intake air annular chamber through a number of intake air pipes respectively, and then is transmitted through the heating annular pipe of each heating pipe assembly and enters the drainage annular chamber through the heating straight pipe. Then, it is discharged from the drainage space of the steam shaft through the drainage pipe. Since each heating pipe assembly is set as an annular structure, the operating path of the steam in each heating pipe assembly is basically the same, and the heat transfer effect is basically consistent. And the operating path of the steam in the curved heating pipe assembly is longer and the heat transfer effect is better. Brief Description of the Drawings

[0012] Figure 1 It is a structural schematic diagram of the present utility model.

[0013] In the figure: 1. Steam shaft; 2. Steam inlet pipe; 3. Steam inlet annular chamber; 4. Heating pipe assembly; 5. Drainage annular chamber; 6. Drain pipe; 101. Steam inlet space; 102. Drainage space; 41. Heating annular pipe; 42. Heating straight pipe. Detailed implementation mode

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0015] Embodiment 1

[0016] Please refer to Figure 1 , the heating device of the steam calciner shown in the figure includes a steam shaft 1. The steam shaft 1 is provided with a steam inlet space 101 and a drainage space 102, and a plurality of heating pipe assemblies 4 are symmetrically arranged on both sides of the steam shaft 1. On both sides of the steam inlet space 101 of the steam shaft 1, a plurality of steam inlet pipes 2 are symmetrically connected. And each end of each steam inlet pipe 2 far from the steam shaft 1 is respectively connected to a steam inlet annular chamber 3. The other end of each steam inlet annular chamber 3 is respectively connected to one end of a heating pipe assembly 4, and the other end of each heating pipe assembly 4 is respectively connected to one end of a drainage annular chamber 5. The other end of each drainage annular chamber 5 is respectively connected to one end of the drainage space 102 of the steam shaft 1 through a drain pipe 6.

[0017] In this embodiment, each heating pipe assembly 4 includes a heating annular pipe 41 connected to one end of the steam inlet annular chamber 3. The end of the heating annular pipe 41 far from the steam inlet annular chamber 3 is connected to one end of a heating straight pipe 42. The other end of each heating straight pipe 42 is respectively connected to one end of the drainage annular chamber 5.

[0018] Furthermore, after the steam enters from the steam inlet space 101 of the steam shaft 1, it enters the steam inlet annular chamber 3 through a plurality of steam inlet pipes 2 respectively, and then is transmitted through the heating annular pipe 41 of each heating pipe assembly 4 and enters the drainage annular chamber 5 through the heating straight pipe 42. Then, it is discharged through the drain pipe 6 from the drainage space 102 of the steam shaft 1. Since each heating pipe assembly 4 is arranged in an annular structure, the running path of the steam in each heating pipe assembly 4 is basically the same, and the heat transfer effect is basically the same. And the running path of the steam in the curved heating pipe assembly 4 is longer, and the heat transfer effect is better.

[0019] Working principle of the utility model: Steam enters from the steam inlet space 101 of the steam shaft 1 and then enters the steam inlet annular chamber 3 through a plurality of steam inlet pipes 2 respectively. After being transmitted through the heating annular pipes 41 of each heating pipe assembly 4, it enters the drainage annular chamber 5 through the heating straight pipes 42, and then is discharged from the drainage space 102 of the steam shaft 1 through the drainage pipe 6. Since each heating pipe assembly 4 is arranged in an annular structure, the running paths of the steam in each heating pipe assembly 4 are basically the same, and the heat transfer effects are basically consistent. Moreover, the running path of the steam in the curved heating pipe assembly 4 is longer, and the heat transfer effect is better.

[0020] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0021] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. Heating device for steam calcining furnace, including a steam shaft (1), characterized in that: The steam shaft (1) is provided with a steam inlet space (101) and a drainage space (102), and a number of heating tube assemblies (4) are symmetrically arranged on both sides of the steam shaft (1). On both sides of the steam inlet space (101) of the steam shaft (1), a number of steam inlet pipes (2) are symmetrically connected. And at the other end of each steam inlet pipe (2) away from the steam shaft (1), a steam inlet ring chamber (3) is respectively connected. The other end of each steam inlet ring chamber (3) is respectively connected to one end of a heating tube assembly (4), and the other end of each heating tube assembly (4) is respectively connected to one end of a drainage ring chamber (5). The other end of each drainage ring chamber (5) is respectively connected to one end of the drainage space (102) of the steam shaft (1) through a drainage pipe (6).

2. The heating device of the steam calciner according to claim 1, wherein: Each of the heating tube assemblies (4) includes a heating ring tube (41) connected to one end of the steam inlet ring chamber (3).

3. The heating device of the steam calciner according to claim 2, wherein: The end of the heating ring tube (41) away from the steam inlet ring chamber (3) is connected to one end of a heating straight tube (42).

4. The heating device of the steam calciner according to claim 3, characterized in that: The other end of each heating straight tube (42) is respectively connected to one end of the drainage ring chamber (5).

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