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A multi-segment carbonization column with external natural circulation cooling

A natural circulation, carbonization tower technology, used in carbonate preparations, reagents, educts, etc., can solve the problems of low conversion rate, many equipment and complex process of external cooling carbonization tower, and achieve high carbonization conversion rate and extended operation. The effect of high cycle and absorption efficiency

Pending Publication Date: 2019-08-06
中盐昆山有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this patented technical solution is complicated, and there are many equipments. In actual use, it is found that the fine crystals in the tower liquid cannot be completely separated, and the crystals entrained in the circulating liquid must be crushed by the circulating pump, making the crystals thinner and affecting the subsequent filtration. operation, so this patented technology only stays in the laboratory test stage, and there has been no report of its use in industrial production since then
[0008] In 2003, those skilled in the art proposed the technical scheme of "Ammonia Soda External Cooling Carbonization Tower" (ZL03234905.X). The carbonization tower in this technical scheme adopts three-stage external natural circulation cooling mode to overcome the conversion of single-stage external cooling carbonization tower The problem of low efficiency, so that the external cooling carbonization tower can be used in the production of soda ash by the ammonia-soda method
However, this technical scheme has only completed the intermediate test stage. When it is actually used, it is found that the continuous soda production operation time is shorter and the height of the cooling section exceeds 60% of the total height of the tower when it is enlarged, which will make the crystallization thinner. Finally, it failed. It is used in industrial production, and the carbonization tower described in this technical scheme is only suitable for the ammonia-soda method

Method used

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  • A multi-segment carbonization column with external natural circulation cooling
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  • A multi-segment carbonization column with external natural circulation cooling

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Experimental program
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Effect test

specific Embodiment 1

[0081] The large-scale carbonization tower that present embodiment is used for combined alkali method is as figure 2 As shown, its daily output of soda ash is 330-360 tons, and it is a three-stage external natural circulation cooling carbonization tower. The large-scale carbonization tower is composed of an upper tower body 1, a middle tower body 2 and a lower tower body 3, which are sequentially connected from top to bottom. The diameter of the upper tower body is 2.8m, the diameter of the middle tower body is 4.5m, and the lower tower body The diameter of the body is 3.5m, and the total height of the tower is 32m. The outer peripheral side wall of the lower tower body is provided with an air inlet 18 for passing gas into the tower, and the top of the upper tower body is provided with a tail gas outlet 19 for tail gas discharge; There is a liquid inlet 20 for liquid in the tower, and a liquid outlet 21 for liquid discharge is opened at the bottom of the lower tower body.

...

specific Embodiment 2

[0092] The large-scale carbonization tower that present embodiment is used for combined alkali method is as figure 2 As shown, its daily output of soda ash is 450-500 tons, and it is a three-stage external natural circulation cooling carbonization tower. The large-scale carbonization tower is composed of an upper tower body 1, a middle tower body 2 and a lower tower body 3, which are arranged sequentially from top to bottom. The diameter of the upper tower body is 3.0m, the diameter of the middle tower body is 5.0m, and the lower tower body The diameter of the body is 4.0m, and the total height of the tower is 32.7m. The air inlet 18, the tail gas outlet 19, the liquid inlet 20 and the liquid outlet 21 of the tower body are set the same as those in the specific embodiment 1. The setting of each section tray in the tower is the same as setting in the specific embodiment 1.

[0093] In the three-stage cooling zone of the lower tower body, four external coolers 8 with a diamet...

specific Embodiment 3

[0102] The large-scale carbonization tower that present embodiment is used for ammonia-soda method is as figure 1 As shown, it produces 500 tons of soda ash per day, and it is a three-stage external natural circulation cooling carbonization tower. The large-scale carbonization tower is composed of an upper tower body 1, a middle tower body 2 and a lower tower body 3, which are arranged sequentially from top to bottom. The diameter of the upper tower body is 4.5m, the diameter of the middle tower body is 4.5m, and the lower tower body The diameter of the body is 3.6m, and the total height of the tower is 33.2m. The air inlet 18, the tail gas outlet 19, the liquid inlet 20 and the liquid outlet 21 of the tower body are set the same as those in the specific embodiment 1.

[0103] The tower is equipped with a number of sieve trays with a low opening ratio and a downcomer with the liquid phase as the continuous phase. In this specific embodiment, eight upper trays 4 are arranged ...

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Abstract

The invention discloses a multi-segment carbonization column with external natural circulation cooling. Each of upper, middle and lower column body segments of the carbonization column is provided with a plurality of column trays inside. The upper, middle and lower column body segments are provided with downcomers in different forms and are different in diameters and hole spacing of column tray sieve holes. At least two external coolers are disposed outside the column body of each cooling zone segment of the lower column body segment. The external coolers of the adjacent two cooling zone segments are staggered on the plane, and water inlets and outlets of the external coolers at the same side of the cooling zone are connected end to end. The column body and tube plates of the external coolers are molded with carbon steel-stainless steel composite plates or carbon steel-titanium composite plates, components in the column are molded with stainless steel, shells of the external coolers and the like are molded with carbon steel, and cooling tubes are molded with stainless steel or titanium. The column has characteristics of capability of a large size, high carbon dioxide absorption efficiency and carbonization conversion rate, high heat transfer efficiency, long continuous alkali production operation, low iron content in finished products, large crystal size of sodium bicarbonate,high efficiency and high cost performance, can be applied to the Hou's Process for soda production and is applicable to the ammonia-soda process.

Description

technical field [0001] The invention relates to equipment for producing soda ash, in particular to a multi-section external natural circulation cooling large-scale carbonization tower, which is suitable for producing soda ash by ammonia-soda method and combined soda method. Background technique [0002] The carbonization tower (also carbonation tower) is the core equipment of soda ash production. The main chemical reaction of soda ash production is carried out in this tower. Gas, liquid, solid and other multiphase systems. Typical unit operating equipment such as absorption towers, reactors, crystallizers, and heat exchangers in chemical engineering are not suitable for carbonation operations in soda ash production, so carbonation towers are special equipment for soda ash production. [0003] At present, the soda ash manufacturers in the world generally use the Solvay type carbonization tower. The tower is made of cast iron and is composed of multi-section cast iron tower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/16C01D7/18
CPCC01D7/16C01D7/18Y02P20/141
Inventor 周光耀屈宪章丁超然夏文菊范兴男阚文生李瑞峰汪峰叶金金王亮亮
Owner 中盐昆山有限公司
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