Cyclic utilization device for tail gas of baking soda carbonization tower

Abstract

The utility model discloses a baking soda carbonization tower tail gas recycling device which comprises a recycling bin, a layer plate is horizontally and fixedly arranged in the middle of the interior of the recycling bin, a cooling cavity is formed below the layer plate, and the interior of the cooling cavity is divided into a plurality of layers of annular channels from outside to inside through a plurality of annular partition plates and baffles; notches communicated with the adjacent annular channels are formed in the annular partition plates; a tail gas inlet is formed in the bottom of the recycling bin of the innermost annular channel, a gas outlet of the cooling cavity is formed in a layer plate of the outermost annular channel, and a spray head communicated with an external cold water source is arranged at the bottom of the layer plate; an alkali liquor tank and an alkali liquor buffer tank are arranged above the laminate; the gas-liquid separator is communicated between the gas outlet of the cooling cavity and the alkali liquor tank; and the alkali liquor tank is communicated with the alkali liquor buffer tank through an infusion pump. According to the device, baking soda carbonization tail gas can be fully recycled, the recycling rate of carbon dioxide can be remarkably increased, and baking soda production is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the field of baking soda production and processing, and specifically relates to a baking soda carbonization tower tail gas recycling device. Background Art

[0002] In the baking soda production process, soda ash, baking soda washing water, and wet decomposition liquid are indirectly heated by low-pressure steam in the alkali tank to form qualified alkali solution, which is then sent to the alkali solution barrel. The clear alkali solution is then pumped to the filter and filtered to the carbonization tower, where it reacts with the kiln gas in reverse to generate wet baking soda slurry. The carbonization tower will produce a large amount of tail gas during the reaction, and the inability of the carbonization tower to meet emission standards or low carbon emissions during use is a technical problem that has always existed in the industry. However, the existing tail gas recovery device cannot fully recycle the baking soda carbonization tail gas, and the recovery rate of carbon dioxide in the waste gas is low. Utility Model Content

[0003] In order to address the deficiencies in the prior art, the utility model aims to provide a baking soda carbonization tower tail gas recycling device, which can more fully recycle the baking soda carbonization tail gas, significantly improve the recovery rate of carbon dioxide, and make the production of baking soda more energy-saving and environmentally friendly.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A device for recycling tail gas from a baking soda carbonization tower comprises a recovery bin, wherein a layer plate is fixedly arranged horizontally in the middle of the recovery bin, a cooling chamber is arranged below the layer plate, a plurality of annular partition plates are arranged vertically from the outside to the inside of the cooling chamber, a baffle plate is fixedly arranged along the radial direction of the recovery bin body and perpendicular to the annular partition plate, one end of the baffle plate is fixedly connected to the inner wall of the recovery bin, and the other end extends to the center of the recovery bin; a plurality of annular channels are formed between adjacent annular partition plates, baffle plates and the recovery bin; a notch connecting adjacent annular channels is opened on the annular partition plate; an exhaust gas inlet is arranged at the innermost The bottom of the recovery bin of the annular channel of the layer, the air outlet of the cooling chamber is opened on the layer plate of the outermost annular channel, and a nozzle connected to the external cold water source is arranged at the bottom of the layer plate; an alkali liquid tank and an alkali liquid buffer tank are arranged above the layer plate, and a gas-liquid separator is connected between the air outlet of the cooling chamber and the alkali liquid tank; a stirring mechanism is arranged in the alkali liquid tank, and the alkali liquid tank and the alkali liquid buffer tank are connected through a liquid pump; a liquid inlet pipe is arranged on the top of the alkali liquid tank; an exhaust pipe is arranged on the top of the alkali liquid buffer tank, and the exhaust pipe is connected to the carbon dioxide recovery system, and a discharge pipe is arranged at the bottom of the alkali liquid buffer tank.

[0006] Preferably, a plurality of nozzles are provided at equal intervals at the bottom of the layer plate in the annular channel.

[0007] Preferably, the exhaust gas inlet is arranged close to the baffle side, and the gas outlet of the cooling chamber is arranged close to the baffle at the farthest end of the gas flow direction of the annular channel.

[0008] Preferably, a plurality of transverse partitions are staggered in the vertical direction in the alkali liquid tank, and the stirring mechanism includes a stirring motor, a stirring shaft and a paddle. The stirring shaft passes through the transverse partition and is vertically installed in the middle of the alkali liquid tank. The stirring shaft is connected to the stirring motor outside the recovery bin, and the paddle is fixedly connected to the stirring shaft.

[0009] Preferably, paddle blades are installed on the stirring shafts between adjacent transverse partitions.

[0010] Preferably, the gas-liquid separator is installed on the side wall of the alkali liquid tank close to the lowest transverse partition.

[0011] Preferably, the liquid outlet of the alkali liquid tank connected to the liquid pump is arranged on the side wall of the alkali liquid tank close to the uppermost transverse partition.

[0012] Preferably, a heating pipe is provided in the alkali solution buffer tank in a vertically upward spiral disk close to the tank wall.

[0013] The beneficial effects of the utility model are:

[0014] 1. The tail gas of the carbonization tower of the utility model enters the innermost annular channel from the tail gas inlet at the bottom of the recovery bin, flows along the annular channel to the farthest notch, enters the outer annular channel and flows to the farthest notch, and flows from inside to outside along different annular channels. During this period, the cooling nozzles on the layer plates can effectively cool the tail gas, and the cooled tail gas discharged from the air outlet above the outermost annular channel is introduced into the alkali liquid tank through the gas-liquid separator.

[0015] 2. The cooled tail gas is introduced from the bottom of the alkali liquid tank by the gas-liquid separator. Under the barrier of the staggered baffles, the gas flows upward along a zigzag route, which significantly increases the contact reaction path between the tail gas and the alkali liquid. In addition, the rotating stirring of the paddles between the baffles enables the alkali liquid and the carbon dioxide in the tail gas to fully contact and react, making the reaction more complete, thereby significantly reducing the concentration of carbonized tail gas.

[0016] 3. The liquid pump sends the reaction liquid in the alkali liquid tank into the alkali liquid buffer tank. After being heated by the heating tube, the sodium bicarbonate is decomposed to release carbon dioxide, and then sent to the carbon dioxide recovery system through the exhaust pipe for recycling, which is more energy-saving and environmentally friendly and effectively reduces production costs; the bottom discharge pipe is used to discharge the decomposed alkali liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 This is a top view of the installation of the annular partition and the baffle of the utility model;

[0019] Figure 3The utility model is a schematic diagram of the internal structure of the alkali liquid tank. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of use of the present invention.

[0021] like Figure 1-3 As shown, the utility model proposes a baking soda carbonization tower tail gas recycling device, including a recovery bin 1, a layer plate 2 is fixedly arranged horizontally in the middle of the recovery bin 1, a cooling chamber is arranged below the layer plate 2, and a multi-layer annular partition 31 is vertically spaced from the outside to the inside of the cooling chamber, a baffle 32 is fixedly arranged along the radial direction of the recovery bin 1 and perpendicular to the annular partition 31, one end of the baffle 32 is fixedly connected to the inner wall of the recovery bin 1, and the other end extends to the center of the recovery bin 1; a multi-layer annular channel 30 is formed between adjacent annular partitions 31, baffles 32 and the recovery bin 1; a notch 310 is opened on the annular partition 31 to connect adjacent annular channels 30; the notch 310 is opened on the annular partition 31 at the farthest end of the gas flow in each annular channel 30. The exhaust gas inlet 10 is arranged at the bottom of the recovery bin 1 of the innermost annular channel 30 near the baffle 32, and the gas outlet 20 of the cooling chamber is opened on the layer plate 2 of the outermost annular channel 30. The gas outlet 20 of the cooling chamber is arranged at the farthest end of the gas flow of the annular channel 30 near the baffle 32. A plurality of nozzles 4 connected to the external cold water source are arranged at equal intervals at the bottom of the layer plate 2 in the annular channel 30. A liquid discharge port 11 with a control valve is arranged on the side wall of the cooling chamber.

[0022] The tail gas of the carbonization tower enters the innermost annular channel 30 from the tail gas inlet 10 at the bottom of the recovery bin 1, flows along the annular channel 30 to the farthest notch 310, enters the outer annular channel 30 and then flows to the farthest notch 310, and flows from inside to outside along different annular channels 30. During this period, the cooling nozzle 4 on the layer plate 2 can effectively cool the tail gas, and the cooled tail gas discharged from the air outlet 20 above the outermost annular channel 30 is introduced into the alkali liquid tank 5 through the gas-liquid separator 7.

[0023] A lye tank 5 and a lye buffer tank 9 are arranged above the layer plate 2. A liquid inlet pipe 51 with a control valve is arranged on the top of the lye tank 5. An exhaust pipe 91 is arranged on the top of the lye buffer tank 9, and the exhaust pipe 91 is connected to the carbon dioxide recovery system. A discharge pipe 92 with a control valve is arranged at the bottom of the lye buffer tank 9. A gas-liquid separator 7 is connected between the gas outlet 20 of the cooling chamber and the lye tank 5. A stirring mechanism is arranged in the lye tank 5, and the lye tank 5 and the lye buffer tank 9 are connected through a liquid pump 8. Specifically, a plurality of transverse partitions 52 are arranged in an interlaced manner in the vertical direction in the lye tank 5. The stirring mechanism includes a stirring motor 61, a stirring shaft 62 and a paddle 63. The stirring shaft 62 penetrates the transverse partition 52 and is vertically installed in the middle of the lye tank 5. The stirring shaft 62 is connected to the stirring motor 61 outside the recovery bin 1. The paddle 63 is fixedly connected to the stirring shaft 62. The stirring shaft 62 between adjacent transverse partitions 52 is equipped with paddles 63, which can make the reaction more sufficient. The gas-liquid separator 7 is installed on the side wall of the alkali liquid tank 5 near the bottom transverse partition 52 , and the liquid outlet 53 of the alkali liquid tank 5 connected to the liquid suction pump 8 is arranged on the side wall of the alkali liquid tank 5 near the top transverse partition 52 .

[0024] The cooled exhaust gas is introduced from below the alkali liquid tank 5 by the gas-liquid separator 7. Under the barrier of the staggered baffles 52, the gas flows upward along a zigzag route, which significantly increases the contact reaction path between the exhaust gas and the alkali liquid. In addition, the paddles 63 arranged between the baffles 52 rotate and stir, so that the alkali liquid and the carbon dioxide in the exhaust gas can fully contact and react, and the reaction is more complete, thereby significantly reducing the concentration of the carbonized exhaust gas.

[0025] A heating pipe is arranged in a spiral coil vertically upwards close to the tank wall in the alkali liquid buffer tank 9, and the heating pipe arranged in the spiral coil can fully heat the tail gas in the alkali liquid buffer tank 9. The liquid pump 8 sends the reaction liquid in the alkali liquid tank 5 into the alkali liquid buffer tank 9, and after being heated by the heating pipe, the sodium bicarbonate is decomposed to release carbon dioxide, and then sent to the carbon dioxide recovery system through the exhaust pipe 91 for recycling, which is more energy-saving and environmentally friendly, and effectively reduces production costs; the bottom discharge pipe 92 is used to discharge the decomposed alkali liquid.

[0026] When the utility model is used, after the tail gas of the carbonization tower enters the cooling chamber, it flows from the inside to the outside along the annular channel 30. During this period, the tail gas is cooled by the cooling nozzle 4. The cooled tail gas is introduced into the alkali liquid tank 5 through the gas-liquid separator 7. After the tail gas in the alkali liquid tank 5 is fully reacted with the alkali liquid under the obstruction of the cross partition 52 and the rotation stirring of the stirring mechanism, it is sent to the alkali liquid buffer tank 9 through the liquid pump 8. In the alkali liquid buffer tank 9, it is heated and heated by the heating tube and decomposed to release carbon dioxide, and then sent to the carbon dioxide recovery system through the exhaust pipe 91 for recycling.

[0027] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A baking soda carbonization tower tail gas recycling device, comprising a recovery bin, characterized in that: A layer plate is fixedly arranged horizontally in the middle of the recovery bin, a cooling chamber is arranged below the layer plate, multiple layers of annular partition plates are arranged vertically from the outside to the inside of the cooling chamber, a baffle plate is fixedly arranged along the radial direction of the recovery bin body and perpendicular to the annular partition plate, one end of the baffle plate is fixedly connected to the inner wall of the recovery bin, and the other end extends to the center of the recovery bin; multiple layers of annular channels are formed between adjacent annular partition plates, baffle plates and the recovery bin; and a notch is opened on the annular partition plate to connect adjacent annular channels; The tail gas inlet is arranged at the bottom of the recovery bin of the innermost annular channel, the layer plate of the outermost annular channel is provided with an air outlet of the cooling chamber, and a nozzle connected to the external cold water source is provided at the bottom of the layer plate; an alkali liquid tank and an alkali liquid buffer tank are provided above the layer plate, and a gas-liquid separator is connected between the air outlet of the cooling chamber and the alkali liquid tank; a stirring mechanism is provided in the alkali liquid tank, and the alkali liquid tank and the alkali liquid buffer tank are connected through a liquid pump; a liquid inlet pipe is provided on the top of the alkali liquid tank; an exhaust pipe is provided on the top of the alkali liquid buffer tank, and the exhaust pipe is connected to the carbon dioxide recovery system, and a discharge pipe is provided at the bottom of the alkali liquid buffer tank.

2. The sodium bicarbonate carbonizing tower tail gas recycling device according to claim 1, characterized in that: A plurality of nozzles are arranged at equal intervals at the bottom of the layer plate in the annular channel.

3. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 1, characterized in that: The tail gas inlet is arranged close to the baffle side, and the gas outlet of the cooling chamber is arranged close to the baffle at the farthest end of the gas flow direction of the annular channel.

4. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 1, characterized in that: A plurality of transverse partitions are staggered in the vertical direction in the alkali liquid tank, and the stirring mechanism includes a stirring motor, a stirring shaft and a paddle. The stirring shaft passes through the transverse partition and is vertically installed in the middle of the alkali liquid tank. The stirring shaft is connected to the stirring motor outside the recovery bin, and the paddle is fixedly connected to the stirring shaft.

5. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 4, characterized in that: Paddle blades are installed on the stirring shafts between adjacent transverse partitions.

6. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 5, characterized in that: The gas-liquid separator is installed on the side wall of the alkali liquid tank close to the lowest transverse partition.

7. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 5, characterized in that: The liquid outlet of the alkali liquid tank connected to the liquid pump is arranged on the side wall of the alkali liquid tank close to the uppermost transverse partition.

8. The sodium bicarbonate carbonization tower tail gas recycling device according to claim 1, characterized in that: A heating pipe is arranged in the alkali solution buffer tank on a spiral disk which is vertically upward and close to the tank wall.

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