Industrial flue gas water glass decarbonization device and decarbonization method

Abstract

The application discloses a kind of industrial flue gas sodium silicate decarburization device and decarburization method, it is related to carbon dioxide emission reduction technical field, comprising: carbonization tower, for the carbon dioxide in industrial flue gas and sodium carbonate mother liquor reaction forms sodium bicarbonate solution and decarburization flue gas;Reaction tank is used to form white carbon black and sodium carbonate slurry with sodium bicarbonate solution and sodium silicate solution reaction;White carbon black separator is used to form sodium carbonate mother liquor and white carbon black finished product with white carbon black and sodium carbonate slurry separation;White carbon black separator is communicated with carbonization tower, for conveying sodium carbonate mother liquor to carbonization tower;Part of sodium carbonate mother liquor is transported to sodium carbonate separator, and sodium carbonate separator is used to form sodium carbonate crystal by separating sodium carbonate mother liquor. Sodium carbonate is used as the medium of recycling absorption industrial flue gas carbon dioxide, while efficiently absorbing carbon dioxide, white carbon black can be produced and by-product sodium carbonate crystal is generated, compared with prior art, the processing cost of industrial flue gas carbon dioxide is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide emission reduction, in particular to an industrial flue gas water glass decarburization device and a decarburization method. BACKGROUND

[0002] White carbon black, also known as precipitated silica or fumed silica, is widely used in the rubber industry, plastics industry, food industry, pharmaceutical industry and other fields. In the production process of white carbon black, using high-concentration product carbon dioxide is beneficial to improve the reaction rate and increase the product generation rate, but it will cause a large amount of carbon emission, and the carbon dioxide in industrial flue gas needs to be captured, stored or utilized.

[0003] The existing carbon reduction technology adopts the following measures:

[0004] In terms of carbon capture: separating carbon dioxide before fuel combustion, such as integrated gasification combined cycle (IGCC), or separating carbon dioxide from combustion exhaust after combustion, and the chemical absorption method is commonly used.

[0005] In terms of carbon storage: injecting carbon dioxide into depleted oil and gas fields, saline aquifers, deep sea, etc. or reacting carbon dioxide with minerals to form carbonates for long-term stable storage.

[0006] In terms of carbon utilization technology: injecting carbon dioxide into oil fields to increase crude oil production. Converting carbon dioxide into chemicals such as methanol, urea, etc. Converting carbon dioxide into biomass such as algae cultivation through photosynthesis. Using carbon dioxide to synthesize fuels such as methane, methanol, etc.

[0007] Although the above measures can effectively reduce the carbon dioxide emission in industrial flue gas, the treatment cost is very high. Therefore, how to provide an efficient and low-cost industrial flue gas carbon dioxide treatment device is a problem that needs to be solved by those skilled in the art. SUMMARY

[0008] The purpose of the present application is to provide an industrial flue gas water glass decarburization device and a decarburization method to solve the problems existing in the prior art.

[0009] To achieve the above-mentioned purpose, the present application provides an industrial flue gas water glass decarburization device, comprising:

[0010] A carbonization tower is in communication with a fan, the fan is used to transport industrial flue gas to the carbonization tower, and the carbonization tower is used to react carbon dioxide in the industrial flue gas with sodium carbonate mother liquor to form sodium bicarbonate solution and decarburization flue gas;

[0011] A reaction tank is in communication with the carbonization tower and is used to react sodium bicarbonate solution with water glass solution to form white carbon black and sodium carbonate slurry;

[0012] A white carbon black separator is in communication with the reaction tank and is used to separate the white carbon black from the sodium carbonate slurry to form a sodium carbonate mother liquor and a white carbon black product; the white carbon black separator is in communication with the carbonation tower and is used to deliver the sodium carbonate mother liquor to the carbonation tower;

[0013] A sodium carbonate separator is in communication with the white carbon black separator, part of the sodium carbonate mother liquor is delivered to the sodium carbonate separator, and the sodium carbonate separator is used to separate the sodium carbonate mother liquor to form sodium carbonate crystals.

[0014] Further, it further comprises:

[0015] A water glass dissolving tank is used to dissolve the water glass to form a water glass solution, and the water glass dissolving tank is in communication with the reaction tank through a dissolving pump.

[0016] Further, the reaction tank is in communication with the white carbon black separator through a reaction tank slurry pump, and the white carbon black separator is in communication with the carbonation tower through a mother liquor reflux pump.

[0017] Further, it further comprises:

[0018] A sodium carbonate solution evaporator is in communication with the white carbon black separator, part of the sodium carbonate mother liquor is delivered to the sodium carbonate solution evaporator, and the sodium carbonate solution evaporator evaporates the sodium carbonate mother liquor to form a concentrated sodium carbonate solution and evaporated water;

[0019] A sodium carbonate solution cooling tank is in communication with the sodium carbonate solution evaporator, and the sodium carbonate solution cooling tank has a water cooling system for cooling the concentrated sodium carbonate solution.

[0020] A sodium carbonate separator is in communication with the sodium carbonate solution cooling tank through a sodium carbonate slurry pump, and is used to separate the cooled concentrated sodium carbonate solution into sodium carbonate crystals and a sodium carbonate separation liquid, and the sodium carbonate separation liquid is delivered to the sodium carbonate solution evaporator.

[0021] The present application also provides an industrial flue gas water glass method decarburization device, which comprises the following steps:

[0022] S1: After desulfurization, the industrial flue gas is pressurized by a fan and enters the carbonation tower, and the sodium carbonate mother liquor delivered by the mother liquor reflux pump reacts in the carbonation tower to form a sodium bicarbonate solution and a decarburized flue gas, and the decarburized flue gas is discharged from the carbonation tower;

[0023] S2: The sodium bicarbonate solution is discharged into the reaction tank and reacts with the water glass solution to form white carbon black and sodium carbonate slurry;

[0024] S3: The white carbon black and sodium carbonate slurry is transported to the white carbon black separator by the reaction tank slurry pump, the white carbon black and sodium carbonate slurry is separated into sodium carbonate mother liquor and white carbon black product by the white carbon black separator, the white carbon black product is stored after water washing and drying, and the sodium carbonate mother liquor is transported to the carbonation tower by the mother liquor reflux pump;

[0025] S4: Part of the sodium carbonate mother liquor enters the sodium carbonate solution evaporator, the sodium carbonate mother liquor is evaporated to form concentrated sodium carbonate solution and evaporation water, and the evaporation water is used for water washing of the white carbon black or dissolving water glass;

[0026] S5: The concentrated sodium carbonate solution enters the sodium carbonate solution cooling tank and is cooled by the water cooling system.

[0027] S6: The cooled concentrated sodium carbonate solution is transported to the sodium carbonate separator by the sodium carbonate slurry pump, is separated into sodium carbonate crystals and sodium carbonate separation liquid, the sodium carbonate separation liquid is transported to the sodium carbonate solution evaporator, and the sodium carbonate crystals are stored.

[0028] Further, the concentration of the sodium carbonate mother liquor is 8-13%, the PH value is 8-9, and the temperature is 30-60℃.

[0029] Further, the density of the water glass solution is 10-25%.

[0030] Further, the temperature of the reaction tank is 40-60℃, and the organic dispersant 0.2-0.4kg / m 3 is added in the reaction tank.

[0031] Further, the temperature of the sodium carbonate solution cooling tank is 10-30℃.

[0032] Further, after the white carbon black product is washed with water and dried, the specific surface area is above 200m 2 / g, and the DBP oil absorption value is above 3.00ml / g.

[0033] The present application discloses the following technical effects:

[0034] The present application uses sodium carbonate as a circulating absorption of industrial flue gas carbon dioxide, which can produce white carbon black and by-product sodium carbonate crystals while efficiently absorbing carbon dioxide, and the processing cost of industrial flue gas carbon dioxide is greatly reduced compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 Structure diagram of the present application;

[0037] Wherein, 1, fan; 2, carbonization tower; 3, water glass dissolving tank; 4, dissolving pump; 5, reaction tank; 6, reaction tank slurry pump; 7, white carbon black separator; 8, mother liquor reflux pump; 9, sodium carbonate solution evaporator; 10, sodium carbonate slurry pump; 11, sodium carbonate solution cooling tank; 12, water cooling system; 13, sodium carbonate separator. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0040] The embodiments of the present application disclose an industrial flue gas water glass decarburization device, comprising:

[0041] The carbonization tower 2 is communicated with the fan 1, and the fan 1 is used to deliver the industrial flue gas to the carbonization tower 2; the carbonization tower 2 is used to react the carbon dioxide in the industrial flue gas with the sodium carbonate mother liquor to form sodium bicarbonate solution and decarburization flue gas; a plurality of sieve plates with automatically adjusted opening sizes are arranged in the carbonization tower 2, and the liquid level height in the tower is controlled to be 15-20 m;

[0042] The reaction tank 5 is communicated with the carbonization tower 2, and is used to react the sodium bicarbonate solution with the water glass solution to form white carbon black and sodium carbonate slurry;

[0043] The white carbon black separator 7 is communicated with the reaction tank 5, and is used to separate the white carbon black from the sodium carbonate slurry to form sodium carbonate mother liquor and white carbon black product; the white carbon black separator 7 is communicated with the carbonization tower 2, and is used to deliver the sodium carbonate mother liquor to the carbonization tower 2;

[0044] The sodium carbonate separator 13 is communicated with the white carbon black separator 7, and part of the sodium carbonate mother liquor is delivered to the sodium carbonate separator 13; the sodium carbonate separator 13 is used to separate the sodium carbonate mother liquor to form sodium carbonate crystals.

[0045] In the embodiments, further comprising:

[0046] The water glass dissolving tank 3 is used to dissolve the water glass to form water glass solution, and the water glass dissolving tank 3 is communicated with the reaction tank 5 through the dissolving pump 4.

[0047] In the embodiment, the reaction tank 5 is communicated with the white carbon black separator 7 through a reaction tank slurry pump 6, and the white carbon black separator 7 is communicated with the carbonization tower 2 through a mother liquor reflux pump 8.

[0048] In the embodiment, further comprising:

[0049] The sodium carbonate solution evaporator 9 is communicated with the white carbon black separator 7 by using a circulating air evaporator, part of the sodium carbonate mother liquor is transported to the sodium carbonate solution evaporator 9, and the sodium carbonate solution evaporator 9 evaporates the sodium carbonate mother liquor to form a concentrated sodium carbonate solution and evaporated water;

[0050] The sodium carbonate solution cooling tank 11 is communicated with the sodium carbonate solution evaporator 9, and the sodium carbonate solution cooling tank 11 has a water cooling system 12 for cooling the concentrated sodium carbonate solution;

[0051] The sodium carbonate separator 13 is communicated with the sodium carbonate solution cooling tank 11 through a sodium carbonate slurry pump 10, and is used for separating the cooled concentrated sodium carbonate solution into sodium carbonate crystals and sodium carbonate separation liquid, and the sodium carbonate separation liquid is transported to the sodium carbonate solution evaporator 9.

[0052] The embodiment of the present application further provides an industrial flue gas water glass method decarburization method, and the industrial flue gas water glass method decarburization device comprises the following steps:

[0053] S1: the desulfurized industrial flue gas is pressurized into the carbonization tower 2 by the fan 1, reacts with the sodium carbonate mother liquor transported by the mother liquor reflux pump 8 in the carbonization tower 2 to form a sodium bicarbonate solution and a decarburized flue gas, and the decarburized flue gas is discharged from the carbonization tower 2;

[0054] S2: the sodium bicarbonate solution is discharged into the reaction tank 5, reacts with the water glass solution to form white carbon black and sodium carbonate slurry, and specifically, the water glass solution is added to the sodium bicarbonate solution;

[0055] S3: the white carbon black and sodium carbonate slurry is transported to the white carbon black separator 7 through the reaction tank slurry pump 6, the white carbon black and sodium carbonate slurry is separated into sodium carbonate mother liquor and white carbon black products by the white carbon black separator 7, the white carbon black products are stored after being washed with water and dried, and the sodium carbonate mother liquor is transported into the carbonization tower 2 through the mother liquor reflux pump 8;

[0056] S4: part of the sodium carbonate mother liquor enters the sodium carbonate solution evaporator 9, evaporates the sodium carbonate mother liquor to form a concentrated sodium carbonate solution and evaporated water, and the evaporated water is used for washing white carbon black or dissolving water glass;

[0057] S5: the concentrated sodium carbonate solution enters the sodium carbonate solution cooling tank 11 and is cooled by the water cooling system 12;

[0058] S6: The cooled concentrated sodium carbonate solution is delivered by the sodium carbonate slurry pump 10 to the sodium carbonate separator 13, separated into sodium carbonate crystals and sodium carbonate separation liquid, the sodium carbonate separation liquid is delivered to the sodium carbonate solution evaporator 9, and the sodium carbonate crystals are stored.

[0059] In this embodiment, the concentration of the sodium carbonate mother liquor is 8-13%, the PH value is 8-9, and the temperature is 30-60℃.

[0060] In this embodiment, the density of the water glass solution is 10-25%.

[0061] In this embodiment, the temperature of the reaction tank 5 is 40-60℃, and 0.2-0.4kg / m 3 of organic dispersant is added in the reaction tank 5.

[0062] In this embodiment, the temperature of the sodium carbonate solution cooling tank 11 is 10-30℃.

[0063] In this embodiment, after the white carbon product is washed and dried, the specific surface area reaches more than 200m 2 / g, and the DBP oil absorption value reaches more than 3.00ml / g.

[0064] The solubility of sodium carbonate and sodium bicarbonate in water is as follows:

[0065]

[0066] The reaction equation in the carbonation tower 2 is as follows:

[0067] CO2+H2O→H2CO3

[0068] Na2CO3+H2CO3→2NaHCO3

[0069] The reaction equation in the reaction tank 5 is as follows:

[0070] 2NaHCO 3+ Na2SiO3→2Na2CO3+H2SiO3

[0071] H2SiO3→H2O+SiO2↓(white carbon)

[0072] The following applies the above embodiment to the treatment of flue gas dust removal and denitrification and desulfurization of coal-fired furnaces. The flue gas parameters of the coal-fired furnace are as follows:

[0073]

[0074] The cost and output are as follows:

[0075] Input

[0076] Water: 0.5T / h.

[0077] Electricity: 2300 kwh / h.

[0078] Cooling water: 320 t / h.

[0079] Water glass: 11.6 t / h.

[0080] Output

[0081] Sodium carbonate: 10 t / h.

[0082] White carbon black: 5.5 t / h.

[0083] CO2 emission reduction: 4.1 t / h.

[0084] According to the calculation, compared with the method for treating industrial flue gas carbon dioxide in the prior art, the cost can be reduced by more than 50% by using the embodiment.

[0085] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0086] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. An industrial flue gas water glass method decarbonization device, characterized in that: include: A carbonization tower (2) is connected to a blower (1), wherein the blower (1) is used to transport the industrial flue gas to the carbonization tower (2), and the carbonization tower (2) is used to react carbon dioxide in the industrial flue gas with a sodium carbonate mother liquor to form a sodium bicarbonate solution and decarbonized flue gas; A reaction tank (5) is connected to the carbonization tower (2) and is used for reacting the sodium bicarbonate solution with the water glass solution to form white carbon black and sodium carbonate slurry; A white carbon black separator (7) is connected to the reaction tank (5) and is used to separate white carbon black from the sodium carbonate slurry to form a sodium carbonate mother liquor and a white carbon black product; the white carbon black separator (7) is connected to the carbonization tower (2) and is used to transport the sodium carbonate mother liquor to the carbonization tower (2); A sodium carbonate separator (13) is connected to the white carbon black separator (7), and part of the sodium carbonate mother liquor is transported to the sodium carbonate separator (13). The sodium carbonate separator (13) is used to separate the sodium carbonate mother liquor into sodium carbonate crystals.

2. The industrial flue gas water glass decarbonization device according to claim 1, characterized in that: Also includes: The water glass dissolving tank (3) is used to dissolve water glass to form a water glass solution. The water glass dissolving tank (3) is connected to the reaction tank (5) via a dissolving pump (4).

3. The industrial flue gas water glass decarbonization device according to claim 1, characterized in that: The reaction tank (5) is connected to the white carbon black separator (7) via a reaction tank slurry pump (6), and the white carbon black separator (7) is connected to the carbonization tower (2) via a mother liquor reflux pump (8).

4. The industrial flue gas water glass decarbonization device according to claim 1, characterized in that: Also includes: A sodium carbonate solution evaporator (9) is connected to the white carbon black separator (7), and part of the sodium carbonate mother liquor is transported to the sodium carbonate solution evaporator (9). The sodium carbonate solution evaporator (9) evaporates the sodium carbonate mother liquor to form a concentrated sodium carbonate solution and evaporated water; a sodium carbonate solution cooling tank (11) in communication with the sodium carbonate solution evaporator (9), wherein the sodium carbonate solution cooling tank (11) has a water cooling system (12) for cooling the concentrated sodium carbonate solution; The sodium carbonate separator (13) is connected to the sodium carbonate solution cooling tank (11) via a sodium carbonate slurry pump (10) and is used to separate the cooled concentrated sodium carbonate solution into sodium carbonate crystals and sodium carbonate separated liquid. The sodium carbonate separated liquid is transported to the sodium carbonate solution evaporator (9).

5. A method for decarbonizing industrial flue gas using a water glass method, characterized in that: The industrial flue gas water glass method decarbonization device according to claim 4 comprises the following steps: S1: The desulfurized industrial flue gas is pressurized by a blower (1) and enters a carbonization tower (2), where it reacts with the sodium carbonate mother liquor delivered by a mother liquor reflux pump (8) to form a sodium bicarbonate solution and decarbonized flue gas. The decarbonized flue gas is then discharged from the carbonization tower (2). S2: The sodium bicarbonate solution is discharged into the reaction tank (5) and reacts with the water glass solution to form white carbon black and sodium carbonate slurry; S3: The white carbon black and sodium carbonate slurry is transported to the white carbon black separator (7) through the reaction tank slurry pump (6). The white carbon black separator (7) separates the white carbon black and sodium carbonate slurry into sodium carbonate mother liquor and white carbon black finished product. The white carbon black finished product is washed, dried and stored. The sodium carbonate mother liquor is transported to the carbonization tower (2) through the mother liquor reflux pump (8); S4: Part of the sodium carbonate mother liquor enters the sodium carbonate solution evaporator (9), where the sodium carbonate mother liquor is evaporated to form a concentrated sodium carbonate solution and evaporated water, which is used to wash white carbon black or dissolve water glass; S5: The concentrated sodium carbonate solution enters the sodium carbonate solution cooling tank (11) and is cooled by the water cooling system (12); S6: The cooled concentrated sodium carbonate solution is transported to a sodium carbonate separator (13) by a sodium carbonate slurry pump (10) and separated into sodium carbonate crystals and a sodium carbonate separated liquid. The sodium carbonate separated liquid is transported to a sodium carbonate solution evaporator (9) and the sodium carbonate crystals are stored.

6. The method for decarbonizing industrial flue gas using a water glass method according to claim 5, characterized in that: The sodium carbonate mother liquor has a concentration of 8-13%, a pH value of 8-9, and a temperature of 30-60°C.

7. The method for decarbonizing industrial flue gas using a water glass method according to claim 5, characterized in that: The density of the water glass solution is 10-25%.

8. The method for decarbonizing industrial flue gas using a water glass method according to claim 5, characterized in that: The temperature of the reaction tank (5) is 40-60°C, and 0.2-0.4 kg / m organic dispersant is added into the reaction tank (5). 3 , and age for 2-3 hours after the reaction in step S2.

9. The method for decarbonizing industrial flue gas using a water glass method according to claim 5, characterized in that: The temperature of the sodium carbonate solution cooling tank (11) is 10-30°C.

10. The method for decarbonizing industrial flue gas using a water glass method according to claim 5, characterized in that: After washing and drying, the white carbon black product has a specific surface area of ​​200m 2 / g or above, and the DBP oil absorption value reaches above 3.00ml / g.

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