Sodium bicarbonate production equipment

Abstract

The sodium bicarbonate production equipment comprises a reaction tank and an ejector, the lower end of the reaction tank is connected with a sodium carbonate solution inlet through a first pipeline, the lower end of the reaction tank is connected with a circulating pump through a second pipeline, the circulating pump is connected with a sodium carbonate solution outlet through a third pipeline, and the third pipeline is connected with a fourth pipeline. The jet device is connected with the reaction tank through a fifth pipeline, the jet device is further connected with a sixth pipeline, a first one-way valve is arranged on the sixth pipeline, the sixth pipeline is connected with the reaction tank, the sixth pipeline is connected with a carbon dioxide gas inlet through a seventh pipeline, and a sodium bicarbonate crystal outlet is formed in the bottom of the reaction tank. According to the utility model, the defects of dead angle formation, insufficient crystallization, non-uniform granularity, lower sodium bicarbonate conversion rate and the like are overcome. And the prepared finished product is uniform in granularity and stable in quality.

Description

Technical Field

[0001] The utility model relates to the field of sodium bicarbonate preparation, in particular to sodium bicarbonate production equipment. Background Art

[0002] The industrial preparation method of sodium bicarbonate is as follows:

[0003] 1) Gas phase carbonization method

[0004] The sodium carbonate solution is carbonized by carbon dioxide in a carbonization tower, and then separated, dried and crushed to obtain the finished product.

[0005] Na2CO3+CO2(g)+H2O=2NaHCO3

[0006] 2) Gas-solid carbonization method

[0007] Place sodium carbonate on the reaction bed and mix it with water. Inhale carbon dioxide from the bottom. After carbonization, dry and crush to obtain the finished product.

[0008] Na2CO3+CO2+H2O=2NaHCO3

[0009] 3) Waste alkali recovery method

[0010] In the process of soda ash production, the furnace gas produced by the soda ash calcining furnace still contains a large amount of alkali powder after cyclone separation. This furnace gas is recovered with hot alkali to dissolve the alkali powder in the alkali solution. In the process of circulating dissolution, part of the alkali solution is sent to the ammonia evaporation tower to evaporate the ammonia in the hot alkali solution, so that the alkali solution is further concentrated and used as the alkali solution raw material for the production of baking soda. The ammonia, carbon dioxide and water mixed gas from the top of the ammonia evaporation tower enters the original furnace gas cooling tower. The mother liquor separated and dehydrated in the production of baking soda is used for hot alkali solution circulation to dissolve and recover the alkali powder in the furnace gas, forming a production process cycle.

[0011] After the waste alkali solution is recovered, it is carbonized (Na2CO3+CO2+H2O=2NaHCO3), centrifuged and dried to obtain the finished sodium bicarbonate product.

[0012] 4) Natural alkali processing method

[0013] Using natural alkali as raw material, due to the high impurity content, the alkali temperature, concentration and mother liquor circulation times need to be strictly controlled during the preparation of alkali solution, and the total salt content in the mother liquor should be greater than 240g / L. After alkali solution, the concentration of sodium carbonate is greater than 150g / L, sodium chloride is less than 50g / L, and sodium sulfate is less than 90g / L. The obtained alkali solution is filtered to remove slag, and then carbonized with carbon dioxide to form sodium bicarbonate crystals. After washing and dehydration, the washing liquid can be returned to alkali solution or discharged. The crystals are dried to obtain the finished sodium bicarbonate product.

[0014] In the chemical industry, the carbonization process is a combination of chemical reactions, energy conversion, material solute transmission and diffusion, supersaturated solution crystallization and other physical and chemical processes, and at the same time, solid, liquid and gas three material states coexist and react. The carbonization tower is the core equipment in the sodium bicarbonate manufacturing process. The Chinese utility model patent with the publication number CN206985735U discloses a prior art of improved structure of a soda ash sieve plate carbonization tower. In the prior art, the diameter-changing tower ring is used to go up, the sieve plate sieve hole area is gradually reduced, and a downcomer is provided, the gas rises from the sieve hole, the liquid descends from the downcomer, and the liquid flows in a zigzag route. Although the prior art extends the liquid flow route, strengthens the exchange between the gas and liquid phases, and can improve the working efficiency of the internal parts to a certain extent, the prior art still cannot reduce the problem of dead angles that may be formed by the components configured inside the carbonization tower when the liquid flows through the carbonization tower, so to a certain extent, there are defects such as insufficient crystallization, uneven particle size and low sodium bicarbonate conversion rate in the carbonization tower disclosed in the prior art for sodium bicarbonate manufacturing. Meanwhile, the finished product prepared by the prior art has uneven particle size and unstable quality. Utility Model Content

[0015] The utility model provides a sodium bicarbonate production device, which solves the defects of forming dead corners, insufficient crystallization, uneven particle size and low sodium bicarbonate conversion rate. The prepared finished product has uniform particle size and stable quality.

[0016] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0017] The utility model discloses sodium bicarbonate production equipment, comprising a reaction tank and an ejector, wherein the lower end of the reaction tank is connected with a sodium carbonate solution inlet through a pipeline one, the lower end of the reaction tank is connected with a circulation pump through a pipeline two, the circulation pump is connected with a sodium carbonate solution outlet through a pipeline three, a pipeline four is connected with the pipeline three, the end of the pipeline four is connected with the ejector, the ejector is connected with the reaction tank through a pipeline five, the ejector is further connected with a pipeline six, a one-way valve one is arranged on the pipeline six, the pipeline six is ​​connected with the reaction tank, the pipeline six is ​​connected with a carbon dioxide gas inlet through a pipeline seven, and a sodium bicarbonate crystal outlet is arranged at the bottom of the reaction tank.

[0018] Preferably, a switch valve is provided on pipeline 2, a check valve 2 and a switch valve are provided on pipeline 3, and a water pump outlet pressure gauge is also connected to pipeline 3, and the water pump outlet pressure gauge is located between the circulation pump and the check valve 2.

[0019] Preferably, the connection point between pipeline three and pipeline four is located between the one-way valve two and the switch valve, and the switch valve is provided on pipeline four.

[0020] Preferably, a one-way valve three and a switch valve are provided on the pipeline seven, and the one-way valve three is located between the connection point of the pipeline five and the pipeline six and the ejector.

[0021] Preferably, a pressure gauge and a pressure relief valve are provided on the top of the reaction tank, an exhaust pipe is provided on the top of the reaction tank, and a switch valve is provided on the exhaust pipe.

[0022] Preferably, a liquid level switch is provided at the upper end of the reaction tank, and an inspection port is provided on the outer side of the reaction tank.

[0023] Preferably, a plurality of columns are provided at the bottom of the reaction tank, and the columns are mounted on a frame, and a switch valve is provided between the bottom of the reaction tank and the sodium bicarbonate crystallization outlet.

[0024] Preferably, the bottom of the reaction tank is V-shaped, a water distributor is provided inside the lower end of the reaction tank, the pipeline five passes through the reaction tank, and the water distributor is connected to the end of the pipeline five.

[0025] Preferably, an air outlet pipe mounting piece is provided in the middle of the top of the reaction tank, an air outlet pipe is installed at the lower end of the air outlet pipe mounting piece, a plurality of air outlets are provided at the air outlet pipe, and the air outlet pipe is connected to the end of pipeline six.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] 1. By using an ejector, the carbon dioxide gas and the sodium carbonate liquid are fully mixed and reacted, the reaction rate is increased, the reaction degree is more thorough, and the generated sodium bicarbonate particles are more delicate and uniform;

[0028] 2. The circulating pump circulates the solution in the reaction tank to play a role of hydraulic stirring, which can replace the stirring propeller to make the reaction more complete. At the same time, the circulating pump provides the ejector with a pressurizing effect, so one pump has two uses;

[0029] 3. A water distributor is designed to evenly distribute the gas-liquid mixture entering the reaction tank from the ejector outlet to the entire tank body. At the same time, the unreacted gas slowly rises in the tank body and fully reacts with the liquid, making the reaction more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a system schematic diagram of an embodiment of the utility model.

[0031] Figure 2 It is a schematic diagram of an embodiment of the utility model.

[0032] Figure 3 yes Figure 2 YY section view.

[0033] Figure 4 yes Figure 2 Middle XX section view. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] As shown in the figure, the utility model discloses a sodium bicarbonate production equipment, including a reaction tank 1 and an ejector 2, the lower end of the reaction tank 1 is connected to the sodium carbonate solution inlet through a pipe 1 3, the lower end of the reaction tank 1 is connected to the circulation pump 4 through a pipe 2 5, the circulation pump 4 is connected to the sodium carbonate solution outlet through a pipe 3 6, the pipe 3 6 is connected to a pipe 4 7, the end of the pipe 4 7 is connected to the ejector 2, the ejector 2 is connected to the reaction tank 1 through a pipe 5 8, the ejector 2 is also connected to a pipe 6 9, a one-way valve 1 D1 is provided on the pipe 6 9, the pipe 6 9 is connected to the reaction tank 1, the pipe 6 9 is connected to the carbon dioxide gas inlet through a pipe 7 10, and the bottom of the reaction tank 1 is provided with a sodium bicarbonate crystal outlet. A switch valve S1 is provided on the pipe 1 3. The utility model innovatively uses an ejector in the equipment for producing sodium bicarbonate, so that the carbon dioxide gas and the sodium carbonate liquid are fully mixed and reacted, the reaction rate is improved, the reaction degree is more thorough, and the generated sodium bicarbonate particles are more delicate and uniform.

[0036] In one embodiment of the utility model, a switch valve S3 is provided on the pipeline 2 5, a check valve 2 D2 and a switch valve S4 are provided on the pipeline 3 6, and a water pump outlet pressure gauge PI is also connected to the pipeline 3 6, and the water pump outlet pressure gauge PI is located between the circulation pump 4 and the check valve 2 D2.

[0037] In one embodiment of the utility model, the connection point between pipeline three 6 and pipeline four 7 is located between the one-way valve two D2 and the switch valve S4, and the switch valve S5 is provided on the pipeline four 7.

[0038] In an embodiment of the utility model, a one-way valve D3 and a switch valve S7 are provided on the pipeline seven, and the one-way valve D1 is located between the connection point of the pipeline five 8 and the pipeline six 9 and the ejector 2.

[0039] In one embodiment of the utility model, a pressure gauge PIS and a pressure relief valve F1 are provided on the top of the reaction tank 1, an exhaust pipe 11 is provided on the top of the reaction tank 1, and a switch valve S6 is provided at the exhaust pipe 11. The pressure relief valve F1 provides high pressure protection, and the pressure gauge PIS feeds back the system pressure.

[0040] In one embodiment of the utility model, a liquid level switch LS is provided at the upper end of the reaction tank 1, and an inspection port M2 is provided on the outer side of the reaction tank 1. The inspection port M2 is convenient for inspecting the reaction tank. LS1 is low liquid level, and LS2 is closed at high liquid level.

[0041] Equipment operation instructions:

[0042] Liquid inlet → air inlet → gas-liquid mixed cycle → air replenishment → gas-liquid mixed cycle → air replenishment… → gas-liquid mixed cycle → air replenishment → gas-liquid mixed cycle → collect sodium bicarbonate

[0043] 1) Liquid inlet (filling with saturated aqueous solution of sodium carbonate)

[0044] Open the exhaust valve S6, close the switch valves S3, S5, S4, and S7, open the valve S1 to connect the saturated sodium carbonate aqueous solution to the reaction tank 1, and when the connected solution reaches the specified amount, the liquid level switch LS sends a signal, and the valve switch S1 is closed to complete the liquid filling.

[0045] 2) Air intake

[0046] Open the switch valve S7, introduce a specified amount of carbon dioxide gas (about 3 to 5 minutes), then close the switch valve S6. The pressure in the reaction tank 1 begins to rise. When the carbon dioxide intake pressure reaches the specified value (about 0.3MPa), close the switch valve S7 and stop feeding gas into the reaction tank 1.

[0047] 3) Gas-liquid mixed circulation

[0048] Open the switch valve S3, open the switch valve S5, start the circulation pump 4, the solution in the reaction tank 1 is pushed into the ejector to mix with the carbon dioxide gas, and then sprayed into the reaction tank 1 through the reaction tank 1 to realize the gas-liquid mixing cycle. When the specified cycle time is reached, the circulation pump 4 stops running and the gas-liquid mixing cycle stops.

[0049] 4) Replenishing Qi

[0050] When the pressure in the reaction tank 1 drops to the specified value (about 0.15MPa), the switch valve S7 is opened, and the pressure in the reaction tank 1 is increased due to the intake of air. When the pressure in the reaction tank 1 rises to the specified value (about 0.3MPa), the switch valve S8 is closed, and the air supply to the reaction tank is stopped.

[0051] 5) Collect sodium bicarbonate

[0052] Stop the air intake, stop the liquid intake, close the switch valve S1, open the switch valve S6, close the switch valve S3, close the switch valve S4, and open the switch valve S2 after a specified period of rest to collect sodium bicarbonate.

[0053] In one embodiment of the utility model, a plurality of columns 12 are provided at the bottom of the reaction tank 1, and the columns 12 are mounted on a frame 13. A switch valve S2 is provided between the bottom of the reaction tank 1 and the sodium bicarbonate crystallization outlet.

[0054] In one embodiment of the utility model, the bottom of the reaction tank 1 is V-shaped, a water distributor 14 is provided inside the lower end of the reaction tank 1, a pipe 58 passes through the reaction tank 1, and a plurality of water outlets 18 of the water distributor 14 are provided. The water distributor 14 is connected to the end of the pipe 58. The water distributor 14 allows the gas-liquid mixture entering the reaction tank from the ejector outlet to be evenly distributed throughout the tank body, and at the same time, the unreacted gas slowly rises in the tank body and fully reacts with the liquid, making the reaction more thorough.

[0055] In one embodiment of the utility model, an outlet pipe mounting part 15 is provided at the middle of the top of the reaction tank 1, an outlet pipe 16 is installed at the lower end of the outlet pipe mounting part 15, and a plurality of outlet ports 17 are provided at the outlet pipe 16, and the outlet pipe 16 is connected to the end of the pipeline 69. The outlet pipe 16 is annular, and in the air intake stage: the carbon dioxide that enters uniformly is deposited at the bottom due to its high density, which facilitates the more thorough discharge of the air in the original tank from the top; in the jet working stage, the carbon dioxide tail gas that has not reacted completely in time is re-inhaled by the ejector and continues to participate in the reaction, thereby improving the utilization rate of carbon dioxide gas.

[0056] The above contents are merely examples and explanations of the structure of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A sodium bicarbonate production equipment, characterized in that: The invention comprises a reaction tank and an ejector, wherein the lower end of the reaction tank is connected to an inlet of a sodium carbonate solution through a pipe 1, the lower end of the reaction tank is connected to a circulation pump through a pipe 2, the circulation pump is connected to an outlet of the sodium carbonate solution through a pipe 3, a pipe 4 is connected to the pipe 3, the end of the pipe 4 is connected to the ejector, the ejector is connected to the reaction tank through a pipe 5, the ejector is further connected to a pipe 6, a one-way valve 1 is arranged on the pipe 6, the pipe 6 is connected to the reaction tank, the pipe 6 is connected to an inlet of a carbon dioxide gas through a pipe 7, and a sodium bicarbonate crystallization outlet is arranged at the bottom of the reaction tank.

2. A sodium bicarbonate production equipment according to claim 1, characterized in that: A switch valve is provided on pipeline two, a check valve two and a switch valve are provided on pipeline three, and a water pump outlet pressure gauge is also connected to pipeline three, and the water pump outlet pressure gauge is located between the circulation pump and the check valve two.

3. A sodium bicarbonate production equipment according to claim 2, characterized in that: The connection point between pipeline three and pipeline four is located between the one-way valve two and the switch valve, and the switch valve is provided on pipeline four.

4. A sodium bicarbonate production equipment according to claim 2, characterized in that: A one-way valve three and a switch valve are arranged on the pipeline seven, and the one-way valve three is located between the connection point of the pipeline five and the pipeline six and the ejector.

5. A sodium bicarbonate production equipment according to claim 1, characterized in that: A pressure gauge and a pressure relief valve are arranged on the top of the reaction tank, an exhaust pipe is arranged on the top of the reaction tank, and a switch valve is arranged on the exhaust pipe.

6. A sodium bicarbonate production equipment according to claim 1, characterized in that: A liquid level switch is provided at the upper end of the reaction tank, and an inspection port is provided on the outer side of the reaction tank.

7. A sodium bicarbonate production equipment according to claim 1, characterized in that: A plurality of columns are arranged at the bottom of the reaction tank, and the columns are installed on a frame. A switch valve is arranged between the bottom of the reaction tank and the sodium bicarbonate crystallization outlet.

8. A sodium bicarbonate production equipment according to claim 1, characterized in that: The bottom of the reaction tank is V-shaped, a water distributor is arranged inside the lower end of the reaction tank, a pipe five passes through the reaction tank, and the water distributor is connected to the end of the pipe five.

9. A sodium bicarbonate production equipment according to claim 1, characterized in that: An air outlet pipe mounting piece is provided in the middle of the top of the reaction tank, an air outlet pipe is installed at the lower end of the air outlet pipe mounting piece, a plurality of air outlets are provided at the air outlet pipe, and the air outlet pipe is connected to the end of the pipeline six.

Images