External cooling type carbonization tower

Abstract

The utility model relates to the technical field of carbonization towers, and discloses an external cooling type carbonization tower which comprises a tower body, and N stages of coolers are arranged on the outer side of the tower body. The device solves the problem that the degree of supersaturation of mother liquor is difficult to guarantee in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of carbonization towers, in particular to an externally cooled carbonization tower. Background Art

[0002] At present, the Solvay carbonization tower used by domestic and foreign soda ash plants is composed of multiple cast iron tower rings, with multiple caps inside the tower and multiple coolers at the bottom of the tower. These coolers remove the heat generated by carbonization reaction and crystallization through inter-wall heat transfer to ensure that the tower liquid has a certain degree of supersaturation. It is also generally called an internally cooled carbonization tower. The single tower production capacity of the internally cooled carbonization tower is relatively small, which does not match the needs of large-scale production equipment.

[0003] With the accumulation of research on carbonizing towers and experience in device operation in the industry, an externally cooled carbonizing tower has emerged in the process of producing soda ash by the ammonia-soda method: the lower part of the carbonizing tower is divided into two sections, and at least one external cooler is arranged outside each section. The external cooler adopts a shell and tube heat exchanger, and the shell and tube heat exchangers are arranged in a staggered manner.

[0004] Since the carbonization tower is made of cast iron tower ring, there are many potential safety hazards to equipment corrosion and the safety and environment caused by corrosion. In addition, compared with other cold and hot forming processes, the quality of equipment materials is more difficult to guarantee in metal casting process. If corrosion-resistant stainless steel is used, the cost is higher; the single-stage externally cooled carbonization tower may overcool the circulating mother liquor and cannot guarantee the supersaturation of the mother liquor. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides an externally cooled carbonization tower to solve the problems existing in the prior art such as difficulty in ensuring the supersaturation of the mother liquor.

[0006] The technical solution adopted by the utility model to solve the above problems is:

[0007] An externally cooled carbonization tower comprises a tower body, and an N-stage cooler is arranged outside the tower body.

[0008] As a preferred technical solution, N-stage coolers are arranged from top to bottom.

[0009] As a preferred technical solution, N stages of coolers are coaxial.

[0010] N-stage external coaxial high-efficiency coolers are set up to create a tower bottom liquid circulation space with a large supersaturation gradient and improve the subcooling degree of the bottom liquid.

[0011] As a preferred technical solution, it also includes an interstage cooling water pipe, and two adjacent stages of coolers are connected through the interstage cooling water pipe.

[0012] As a preferred technical solution, it also includes a middle partition, and adjacent two-stage coolers are connected via the middle partition.

[0013] The multi-stage coolers are arranged to be directly connected coaxially up and down, and the pipe boxes of adjacent coolers are shared through the middle partition to save the space of the cooler.

[0014] As a preferred technical solution, it also includes an inlet connecting pipe, through which the cooler and the tower body are connected.

[0015] As a preferred technical solution, it also includes an outlet connecting pipe, and the cooler and the tower body are connected through the outlet connecting pipe.

[0016] Connecting the inlet and outlet pipelines (outlet connecting pipe, inlet connecting pipe) is beneficial to reducing the circulation resistance, thereby increasing the mother liquor subcooling degree of the tower body, improving the quality of soda ash, and improving the circulation efficiency of the tower bottom liquid.

[0017] As a preferred technical solution, the cooler includes a heat exchange tube, and the heat exchange tube is provided with fins.

[0018] The arrangement of fins is beneficial to improving heat transfer efficiency.

[0019] As a preferred technical solution, N=3.

[0020] As a preferred technical solution, the tower body includes a tower top and a tower bottom which are sequentially connected from top to bottom, and an N-stage cooler is arranged outside the tower bottom.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] (1) The utility model is provided with N-stage external coaxial high-efficiency coolers to create a tower bottom liquid circulation space with a large supersaturation gradient, thereby improving the supercooling degree of the bottom liquid;

[0023] (2) The utility model arranges the multi-stage coolers to be directly connected coaxially up and down, and the pipe boxes of adjacent coolers are shared through the middle partition to save the space of the coolers;

[0024] (3) The connection of the inlet and outlet pipelines (outlet connecting pipe, inlet connecting pipe) of the utility model is conducive to reducing the circulation resistance, thereby improving the mother liquid supercooling degree of the tower body, improving the quality of soda ash, and improving the circulation efficiency of the tower bottom liquid;

[0025] (4) The arrangement of the fins of the utility model is conducive to improving the heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 Schematic diagram of the cooler layout.

[0028] Marks and their corresponding names in the accompanying drawings: 1. sieve plate, 2. outlet connecting pipe, 3. primary cooler, 4. interstage cooling water pipe, 5. secondary cooler, 6. tertiary cooler, 7. inlet connecting pipe, 8. tower body, 9. middle partition, 81. tower top, 82. tower bottom. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0030] Example 1

[0031] like Figure 1 to Figure 2 As shown, an externally cooled carbonization tower comprises a tower body 8, and an N-stage cooler is arranged outside the tower body 8.

[0032] As a preferred technical solution, N-stage coolers are arranged from top to bottom.

[0033] As a preferred technical solution, N stages of coolers are coaxial.

[0034] N-stage external coaxial high-efficiency coolers are set up to create a tower bottom liquid circulation space with a large supersaturation gradient and improve the subcooling degree of the bottom liquid.

[0035] As a preferred technical solution, it also includes an inter-stage cooling water pipe 4, and two adjacent coolers are connected through the inter-stage cooling water pipe 4.

[0036] As a preferred technical solution, it also includes a middle partition plate 9, and adjacent two-stage coolers are connected via the middle partition plate 9.

[0037] The multi-stage coolers are arranged to be directly connected coaxially up and down, and the pipe boxes of adjacent coolers are shared through the middle partition 9 to save the space of the coolers.

[0038] As a preferred technical solution, it also includes an inlet connecting pipe 7 , through which the cooler and the tower body 8 are connected.

[0039] As a preferred technical solution, it also includes an outlet connecting pipe 2, and the cooler and the tower body 8 are connected through the outlet connecting pipe 2.

[0040] The connection of the inlet and outlet pipelines (the outlet connecting pipe 2 and the inlet connecting pipe 7) is beneficial to reducing the circulation resistance, thereby increasing the mother liquor supercooling degree of the tower body 8, improving the quality of soda ash, and improving the circulation efficiency of the tower bottom liquid.

[0041] As a preferred technical solution, the cooler includes a heat exchange tube, and the heat exchange tube is provided with fins.

[0042] The arrangement of fins is beneficial to improving heat transfer efficiency.

[0043] As a preferred technical solution, N=3.

[0044] As a preferred technical solution, the tower body 8 includes a tower top 81 and a tower bottom 82 which are sequentially connected from top to bottom, and an N-stage cooler is arranged outside the tower bottom 82 .

[0045] Example 2

[0046] like Figure 1 to Figure 2 As shown, as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:

[0047] like Figure 1 As shown, a novel multi-stage high-efficiency coaxial externally cooled carbonization tower comprises a tower body 8 (including a tower top 81 and a tower bottom 82), a tower plate (a sieve plate 1), a multi-stage cooler (a primary cooler 3, a secondary cooler 5, and a tertiary cooler 6), an inter-stage cooling water pipe 4, and connecting inlet and outlet pipes between the tower body 8 and the cooler.

[0048] A plurality of sieve plates 1 are respectively provided at the tower top 81 and the tower bottom 82, which are beneficial to reducing liquid backmixing, forming a concentration gradient, and improving the driving force of mass transfer, thereby improving the reaction speed and reaction conversion rate.

[0049] The multi-stage coolers are arranged to be directly connected coaxially up and down, and the pipe boxes of adjacent coolers are shared through the middle partition 9 to save the space of the coolers.

[0050] The heat exchange tubes used in the cooler adopt high-density fins formed by metal cold processing to enhance the heat transfer structure and improve the heat transfer efficiency.

[0051] The multi-stage cooler is connected to the tower body 8 by inlet and outlet pipelines (outlet connecting pipe 2, inlet connecting pipe 7) arranged at a certain angle, so as to improve the circulation efficiency of the tower bottom liquid.

[0052] The utility model not only creates a tower kettle liquid circulation space with a large supersaturation gradient by arranging a multi-stage external coaxial high-efficiency cooler outside the tower kettle of the tower body 8, but also improves the supercooling degree of the kettle liquid.

[0053] The cooler is connected to the tower body 8 by a pipeline, and a certain angle is set in consideration of the fluid characteristics and natural circulation characteristics to reduce the circulation resistance, thereby increasing the mother liquor supercooling degree of the tower body 8 and improving the quality of soda ash.

[0054] As described above, the utility model can be implemented well.

[0055] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. An externally cooled carbonization tower, characterized in that: It comprises a tower body (8), and an N-stage cooler is arranged outside the tower body (8); N-stage coolers are arranged from top to bottom; N-stage cooler coaxial; It also includes an interstage cooling water pipe (4), through which two adjacent coolers are connected; It also includes a middle partition (9), and two adjacent coolers are connected via the middle partition (9); It also includes an inlet connecting pipe (7), through which the cooler and the tower body (8) are connected; It also comprises an outlet connecting pipe (2), and the cooler and the tower body (8) are connected through the outlet connecting pipe (2).

2. An externally cooled carbonization tower according to claim 1, characterized in that: The cooler comprises a heat exchange tube, and fins are arranged on the heat exchange tube.

3. An externally cooled carbonization tower according to claim 1, characterized in that: N＝3。 4. An externally cooled carbonization tower according to any one of claims 1 to 3, characterized in that: The tower body (8) comprises a tower top (81) and a tower bottom (82) which are connected in sequence from top to bottom, and an N-stage cooler is arranged outside the tower bottom (82).

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