Graded gas distribution type carbonization device for alkali production

Abstract

The utility model discloses a graded gas distribution type carbonization device for making alkali, which comprises a tower body, a liquid inlet is arranged at the top of the tower body, a liquid outlet is arranged at the bottom of the tower body, and a waste gas outlet is arranged at the top of the tower body; a plurality of overflow pools are stacked in the tower body from top to bottom, and gas distribution modules are arranged at the bottoms of the overflow pools; the plurality of gas distribution modules at the upper part are connected with an ammonia gas inlet pump through pipelines, and the plurality of gas distribution modules at the lower part are connected with a carbon dioxide inlet pump through pipelines. According to the utility model, the contents of ammonia gas and carbon dioxide in tail gas are reduced while high-efficiency carbonization is realized and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of alkali making equipment, in particular to a graded gas distribution type carbonization device for alkali making. Background Art

[0002] In the technological process of producing soda ash by the ammonia-soda method, ammonia and carbon dioxide need to be introduced into saturated brine in sequence. Introducing the two gases at the same time not only makes it difficult to control the amount introduced, making it impossible to achieve sufficient carbonization, but also leads to insufficient absorption of carbon dioxide and excessively high carbon dioxide content in the tail gas, making it impossible to achieve a balance between sufficient reaction and meeting the tail gas content standards. Introducing the two gases in sequence into a single tower will affect efficiency, and introducing the two gases simultaneously through two interconnected towers will take up a large space. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a graded gas distribution carbonization device for alkali production, which achieves efficient carbonization and low space occupation while reducing the content of ammonia and carbon dioxide in the tail gas.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides a graded gas distribution carbonization device for alkali production, comprising a tower body, wherein a liquid inlet is arranged at the top of the tower body, a liquid discharge port is arranged at the bottom of the tower body, and a waste gas discharge port is arranged at the top of the tower body; a plurality of overflow tanks are stacked from top to bottom in the tower body, and a gas distribution module is arranged at the bottom of the plurality of overflow tanks; the upper plurality of gas distribution modules are connected to an ammonia intake pump through pipelines, and the lower plurality of gas distribution modules are connected to a carbon dioxide intake pump through pipelines.

[0005] Furthermore, the plurality of overflow pools are arranged in a staggered manner, and the overflow outlets of two upper and lower adjacent overflow pools are arranged in a staggered manner.

[0006] Furthermore, four overflow tanks are provided, and the four air distribution modules at the bottom of the overflow tanks are, from top to bottom, the first air distribution module, the second air distribution module, the third air distribution module and the fourth air distribution module; the ammonia air intake pump is connected to the first air distribution module through a first regulating valve, and the ammonia air intake pump is connected to the second air distribution module through a second regulating valve; the carbon dioxide air intake pump is connected to the third air distribution module through a third regulating valve, and the carbon dioxide air intake pump is connected to the fourth air distribution module through a fourth regulating valve.

[0007] Furthermore, the overflow tank where the second air distribution module is located is provided with an ammonia-salt water concentration detection module, and a concentration signal output end of the ammonia-salt water concentration detection module is electrically connected to a control signal receiving end of the second regulating valve.

[0008] Furthermore, the overflow tank where the fourth gas distribution module is located is provided with a sodium ion concentration detection module, and a concentration signal output end of the sodium ion concentration detection module is electrically connected to a control signal receiving end of the fourth regulating valve.

[0009] Furthermore, an exhaust gas concentration detection module is provided on the top of the tower body, and a concentration signal output end of the exhaust gas concentration detection module is electrically connected to a control signal receiving end of the first regulating valve and a control signal receiving end of the third regulating valve.

[0010] Beneficial effects: The utility model is a graded gas distribution carbonization device for alkali production. It meets the process requirements of sequential introduction of ammonia and carbon dioxide through a layer-by-layer overflow distribution method combined with graded gas distribution, and is integrated in the same tower body, reducing the site space required for the entire carbonization process equipment and saving costs. It also ensures that the introduced gas has sufficient contact area and reaction time with the liquid, ensuring that the introduced gas is fully absorbed, thereby reducing its content in the tail gas. The gas introduction amount and compensation amount are controlled by concentration detection to achieve a dynamic balance between the absorption capacity of the solution in the tower and the gas introduction amount, maintaining the content of ammonia and carbon dioxide in the tail gas at extremely low values, which not only reduces the pollution of the tail gas emission to the environment, but also reduces the waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 The utility model is a schematic diagram of the overall structure of an embodiment. DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings.

[0013] As attached Figure 1 The described graded gas distribution carbonization device for alkali production comprises a tower body 1, wherein a liquid inlet 11 is arranged at the top of the tower body 1, a liquid discharge port 12 is arranged at the bottom of the tower body 1, and a waste gas discharge port is arranged at the top of the tower body 1; a plurality of overflow tanks 2 are stacked from top to bottom in the tower body 1, and gas distribution modules are arranged at the bottom of the plurality of overflow tanks 2; the plurality of upper gas distribution modules are connected to an ammonia intake pump 7 through pipelines, and the plurality of lower gas distribution modules are connected to a carbon dioxide intake pump 8 through pipelines.

[0014] This solution inputs saturated salt water from the liquid inlet at the top of the tower body, so that the liquid flows through multiple overflow pools from top to bottom in sequence. The liquid circulation between the upper and lower adjacent overflow pools is completed in the form of overflow. Each overflow pool is provided with a gas distribution module, which can use a common aeration pipeline to spray the required gas from the bottom of the overflow pool into the liquid evenly. Ammonia and carbon dioxide are sprayed successively from top to bottom to ensure that the flowing liquid first reacts with ammonia to generate ammonia salt water of sufficient concentration from the input saturated salt water, and then reacts with carbon dioxide to generate sodium bicarbonate precipitation, ensuring that carbon dioxide can be fully absorbed, which not only meets the process requirements, but also can simultaneously introduce ammonia and carbon dioxide to improve the reaction efficiency. And after layer-by-layer gas distribution, the ventilation volume of each gas distribution can also be controlled separately, which can accurately regulate the input amount of gas, ensure sufficient reaction, reduce the overflow of the introduced gas, and thus reduce the content of ammonia and carbon dioxide in the tail gas.

[0015] The plurality of overflow pools 2 are arranged in an interlaced manner, and the overflow ports of two adjacent overflow pools 2 are arranged in a staggered manner, so as to extend the residence time of the liquid in each overflow pool so that the liquid can fully react with the introduced gas.

[0016] There are four overflow tanks 2, and the four air distribution modules at the bottom of the overflow tanks 2 are, from top to bottom, the first air distribution module 3, the second air distribution module 4, the third air distribution module 5 and the fourth air distribution module 6; the ammonia intake pump 7 is connected to the first air distribution module 3 through a first regulating valve 71, and the ammonia intake pump 7 is connected to the second air distribution module 4 through a second regulating valve 72; the carbon dioxide intake pump 8 is connected to the third air distribution module 5 through a third regulating valve 81, and the carbon dioxide intake pump 8 is connected to the fourth air distribution module 6 through a fourth regulating valve 82.

[0017] Among them, the first gas distribution module is used as the main gas distribution module for ammonia, the second gas distribution module is used as the compensating gas distribution module for ammonia, the third gas distribution module is used as the main gas distribution module for carbon dioxide, and the fourth gas distribution module is used as the compensating gas distribution module for carbon dioxide.

[0018] The overflow pool 2 where the second air distribution module 4 is located is provided with an ammonia salt water concentration detection module 41, and the concentration signal output end of the ammonia salt water concentration detection module 41 is electrically connected to the control signal receiving end of the second regulating valve 72. By detecting the concentration of the ammonia salt water in the second overflow pool from top to bottom, the ammonia gas flow rate of the second air distribution module is regulated. When the ammonia salt water concentration is lower than the preset value, the ammonia gas flow rate of the second regulating valve is increased to achieve the purpose of ammonia gas compensation. When the ammonia salt water concentration reaches the preset value, the second regulating valve is closed to reduce the waste of ammonia gas.

[0019] The overflow pool 2 where the fourth gas distribution module 6 is located is provided with a sodium ion concentration detection module 61, and the concentration signal output end of the sodium ion concentration detection module 61 is electrically connected to the control signal receiving end of the fourth regulating valve 82. By detecting the concentration of sodium ions in the lowest overflow pool, it is determined whether the ammonia salt water is completely carbonated, thereby regulating the carbon dioxide input amount of the fourth gas distribution module. When the sodium ion concentration can still be detected, the carbon dioxide input amount of the fourth regulating valve is increased to achieve the purpose of carbon dioxide compensation. When the sodium ion concentration cannot be detected, the fourth regulating valve is closed to reduce the waste of carbon dioxide.

[0020] The top of the tower body 1 is provided with an exhaust gas concentration detection module 9, and the concentration signal output end of the exhaust gas concentration detection module 9 is electrically connected to the control signal receiving end of the first regulating valve 71 and the control signal receiving end of the third regulating valve 81. By detecting the content of ammonia and carbon dioxide in the exhaust gas at the top of the tower body, the amount of the two gases introduced into the main gas distribution module is regulated. When it is detected that the concentration of the two gases is higher than the preset value, the amount of the main gas distribution module of the corresponding gas is adjusted to be reduced to reduce the content in the exhaust gas. When the concentration of the two gases in the exhaust gas is lower than the preset value, the amount of the main gas distribution module of the corresponding gas is restored to the set value. Then, the balance between the solution absorption capacity and the gas introduction amount is achieved, and the content of ammonia and carbon dioxide in the exhaust gas is reduced, which not only reduces environmental pollution, but also reduces the waste of resources.

[0021] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A graded gas distribution carbonization device for alkali production, characterized in that: The tower body (1) comprises a tower body (1), wherein the top of the tower body (1) is provided with a liquid inlet (11), the bottom of the tower body (1) is provided with a liquid outlet (12), and the top of the tower body (1) is provided with a waste gas outlet; a plurality of overflow tanks (2) are stacked from top to bottom in the tower body (1), and a gas distribution module is provided at the bottom of each of the plurality of overflow tanks (2); the plurality of gas distribution modules at the top are connected to an ammonia gas intake pump (7) through pipelines, and the plurality of gas distribution modules at the bottom are connected to a carbon dioxide gas intake pump (8) through pipelines.

2. A graded gas distribution carbonization device for alkali production according to claim 1, characterized in that: The plurality of overflow pools (2) are arranged in a staggered manner, and the overflow ports of two upper and lower adjacent overflow pools (2) are arranged in a staggered manner.

3. A graded gas distribution carbonization device for alkali production according to claim 2, characterized in that: Four overflow tanks (2) are provided, and the four air distribution modules at the bottom of the overflow tanks (2) are, from top to bottom, a first air distribution module (3), a second air distribution module (4), a third air distribution module (5) and a fourth air distribution module (6); the ammonia air intake pump (7) is connected to the first air distribution module (3) through a first regulating valve (71), and the ammonia air intake pump (7) is connected to the second air distribution module (4) through a second regulating valve (72); the carbon dioxide air intake pump (8) is connected to the third air distribution module (5) through a third regulating valve (81), and the carbon dioxide air intake pump (8) is connected to the fourth air distribution module (6) through a fourth regulating valve (82).

4. A graded gas distribution carbonization device for alkali production according to claim 3, characterized in that: The overflow tank (2) where the second air distribution module (4) is located is provided with an ammonia-salt water concentration detection module (41), and the concentration signal output end of the ammonia-salt water concentration detection module (41) is electrically connected to the control signal receiving end of the second regulating valve (72).

5. A graded gas distribution carbonization device for alkali production according to claim 4, characterized in that: The overflow tank (2) where the fourth gas distribution module (6) is located is provided with a sodium ion concentration detection module (61), and the concentration signal output end of the sodium ion concentration detection module (61) is electrically connected to the control signal receiving end of the fourth regulating valve (82).

6. A graded gas distribution carbonization device for alkali production according to claim 5, characterized in that: An exhaust gas concentration detection module (9) is arranged on the top of the tower body (1), and a concentration signal output end of the exhaust gas concentration detection module (9) is electrically connected to a control signal receiving end of the first regulating valve (71) and a control signal receiving end of the third regulating valve (81).

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