CN217430835U - Tail gas utilization device of sulfuric acid process titanium dioxide calcining kiln - Google Patents
Tail gas utilization device of sulfuric acid process titanium dioxide calcining kiln Download PDFInfo
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- CN217430835U CN217430835U CN202221097273.9U CN202221097273U CN217430835U CN 217430835 U CN217430835 U CN 217430835U CN 202221097273 U CN202221097273 U CN 202221097273U CN 217430835 U CN217430835 U CN 217430835U
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Abstract
The utility model provides a sulfuric acid process titanium dioxide calcining kiln tail gas utilization equipment relates to titanium dioxide technical field. The device specifically comprises a first collecting device, a first spraying device, a second collecting device, a second spraying device, a third collecting device, a nanofiltration device, an air inlet pipeline and an air outlet pipeline which are connected in sequence; the liquid outlet of the nanofiltration device is connected with the first collection device; the air inlet pipeline is connected with the bottoms of the first spraying device and the second spraying device at the same time, and the air outlet pipeline is connected with the tops of the first spraying device and the second spraying device at the same time. The utility model utilizes the high-temperature tail gas of the titanium dioxide calcining kiln to treat the sodium sulfate wastewater in the production process of the iron-based pigment, so as to obtain sodium chloride resources and realize the resource utilization of wastes; the tail gas waste heat can also be used for drying the metatitanic acid raw material in the production process of the titanium dioxide, so that the production cost of the titanium dioxide is reduced; the device structure is easy to realize, low in cost and easy to popularize.
Description
Technical Field
The utility model relates to a titanium dioxide technical field particularly, relates to a sulfuric acid process titanium dioxide calcining kiln tail gas utilization equipment.
Background
The titanium dioxide produced by the sulfuric acid method is widely adopted due to the advantages of mature process, simple equipment, low requirement on raw materials and the like, and is a titanium dioxide production process which is relatively common and has high productivity in China at present. The sulfuric acid method mainly comprises the working procedures of ilmenite acidolysis, titanium liquid hydrolysis, metatitanic acid washing, calcination, surface treatment and the like, wherein a large amount of high-heat flue gas is generated in the calcination working procedure, the temperature of the flue gas discharged out of a rotary kiln used for calcination is controlled to be 300-400 ℃, and the heat taken away by tail gas accounts for nearly 40% of the total input heat. In China, a small number of manufacturers adopt heat conduction pipes to be in direct contact with high-heat flue gas, and transfer part of heat to boilers to produce steam; most titanium dioxide manufacturers do not recover the flue gas because the process is immature. In addition, the prior art can also be used for getting rid of the dust and the sour gas in the tail gas through increasing a spray column, but does not carry out recovery processing to the shower water, does not utilize the heat of tail gas yet, and high fever tail gas will directly discharge to the atmosphere after green processing, and this is the waste to potential heat energy.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tail gas utilization device of a titanium white calcining kiln of a sulfuric acid method, which utilizes the high-temperature tail gas of the titanium white calcining kiln to treat sodium sulfate wastewater generated in the production process of iron-based pigments, obtains sodium chloride resources and realizes the resource utilization of wastes; the tail gas waste heat can also be used for drying the metatitanic acid raw material in the production process of the titanium dioxide, so that the production cost of the titanium dioxide is reduced; the device structure is easy to realize, low in cost and easy to popularize.
In order to realize the above purpose of the utility model, the following technical scheme is adopted:
a tail gas utilization device of a sulfuric acid process titanium dioxide calcining kiln comprises a first collecting device, a first spraying device, a second collecting device, a second spraying device, a third collecting device, a nanofiltration device, an air inlet pipeline and an air outlet pipeline which are sequentially connected;
the liquid outlet of the nanofiltration device is connected with the first collection device;
the air inlet pipeline is connected with the bottoms of the first spraying device and the second spraying device at the same time, and the air outlet pipeline is connected with the tops of the first spraying device and the second spraying device at the same time.
As a preferred embodiment, the tail gas utilization device of the sulfuric acid process titanium dioxide calcining kiln further comprises a crystallization collecting device;
the liquid inlet of the crystallization collecting device is connected with the first collecting device;
and the liquid outlet of the crystallization collecting device is connected with the second collecting device.
In a more preferred embodiment, a filter press is provided in a line connecting the crystal collecting device and the second collecting device.
As a preferred embodiment, the first and/or second spray devices comprise one of a spray tower or a venturi.
As a preferred embodiment, the second and/or third collecting device is provided with an open port for adding a medicament or for taking a sample in real time.
In a preferred embodiment, a stirring device is disposed in the second collecting device and/or the third collecting device.
As a preferred embodiment, the waste liquid port of the nanofiltration device is connected with an electrolytic bath;
and introducing the sodium chloride solution obtained by the nanofiltration device into the electrolytic cell, and electrolyzing and collecting to obtain hydrogen and chlorine resources.
In a preferred embodiment, a cyclone is arranged at the top end of the air inlet pipeline.
As a preferred embodiment, the gas outlet pipeline is connected with a titanium dioxide production workshop and is used for drying the raw material metatitanic acid;
in a preferred embodiment, the end of the gas outlet pipeline is provided with a filter press.
Compared with the prior art, the beneficial effects of the utility model are that:
the tail gas utilization device of the sulfuric acid process titanium dioxide calcining kiln realizes resource recycling of various wastes; specifically, the waste heat of the tail gas of the titanium dioxide calcining kiln adopting the sulfuric acid method is comprehensively utilized to replace the traditional MVR concentrated titanium dioxide high-salt wastewater, the raw material saturated sodium chloride solution of the ionic membrane caustic soda is prepared at low cost, and the residual heat is utilized to replace metatitanic acid materials on a hot air drying filter press, so that the moisture entering the kiln is reduced, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a tail gas utilization device of a titanium white calcining kiln for a sulfuric acid process provided in the specific embodiment of the present invention.
Reference numerals are as follows:
1-a first collecting device;
2-a first spraying device;
3-a second collecting device;
4-a second spraying device;
5-a third collecting device;
6-a nanofiltration device;
7-an air inlet pipeline;
8-gas outlet pipeline.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment is realized by the following technical scheme:
a tail gas utilization device of a sulfuric acid method titanium dioxide calcining kiln is shown in figure 1: the device comprises a first collecting device 1, a first spraying device 2, a second collecting device 3, a second spraying device 4, a third collecting device 5 and a nanofiltration device 6 which are connected in sequence, wherein a liquid outlet of the nanofiltration device 6 is connected with the first collecting device 1;
simultaneously, the device also comprises an air inlet pipeline 7 and an air outlet pipeline 8; the air inlet pipeline 7 is connected with the bottoms of the first spraying device 2 and the second spraying device 4 at the same time, and the air outlet pipeline 8 is connected with the tops of the first spraying device 2 and the second spraying device 4 at the same time.
Simultaneously, the device also comprises a crystal collecting device, wherein a liquid inlet of the crystal collecting device is connected with the first collecting device 1, and a liquid outlet of the crystal collecting device is connected with the second collecting device 3.
The functions or structures of the respective devices will be specifically developed as follows:
the first collecting device 1 is connected with an iron pigment production workshop and is used for collecting sodium sulfate waste liquid discharged in the production process of iron pigments, and the mass fraction of the sodium sulfate waste liquid is 8% -10%.
The first spraying device 2 is used for spraying the sodium sulfate waste liquid in the first collecting device 1, enabling the sodium sulfate waste liquid to be in full contact with tail gas of a titanium white calcining kiln and absorbing heat in the tail gas, and further achieving evaporation of water and increase of mass fraction of the sodium sulfate waste liquid, and specifically, the mass fraction of the sodium sulfate waste liquid obtained through treatment of the first spraying device 2 is 18% -20%, and the temperature is 60-70 ℃;
the first spraying device 2 includes, but is not limited to, one of a spray tower or a venturi.
The second collecting device 3 is used for collecting the concentrated sodium sulfate waste liquid at the bottom of the first spraying device 2; adding calcium chloride waste liquid in the production process of titanium dioxide by a chlorination process into the second collecting device 3 to obtain mixed liquid with a solute mainly comprising sodium chloride;
the second collecting device 3 may also be provided with an open port for adding a medicament or sampling in real time;
several groups of stirring devices may also be arranged inside the second collecting device 3, the size and number of the stirring devices depending on the size of the second collecting device 3.
The second spraying device 4 is used for spraying the mixed liquor in the second collecting device 3, and the mixed liquor is in full contact with tail gas of the titanium white calcining kiln to absorb heat in the tail gas, so that evaporation of water and increase of the mass fraction of the mixed liquor are realized, and specifically, a nearly saturated sodium chloride aqueous solution can be obtained after the mixed liquor is treated by the second spraying device 4;
the second spraying device 4 includes but is not limited to one of a spray tower or a venturi.
The third collecting device 5 is used for collecting the saturated sodium chloride aqueous solution at the bottom of the second spraying device 4; but because the tail gas of the titanium white calcining kiln contains sulfur dioxide, a certain amount of sodium sulfite is also contained in the saturated sodium chloride aqueous solution; adding a proper amount of oxidant into the third collecting device 5 to react and convert sodium sulfite into sodium sulfate; specifically, the oxidant comprises at least one of hydrogen peroxide or sodium hypochlorite, and the concentration of the sodium sulfate is 20-30 g/L;
the third collecting device 5 can also be provided with an open port for adding a medicament or sampling in real time;
several groups of stirring devices can also be arranged in the third collecting device 5, and the scale and number of the stirring devices are determined according to the size of the third collecting device 5.
A nanofiltration membrane and components thereof are arranged in the nanofiltration device 6 and are used for separating sodium chloride and sodium sulfate in the third collection device 5; specifically, sodium sulfate solution with the concentration of 100 g/L-150 g/L and sodium chloride solution are obtained after nanofiltration. Since the liquid outlet of the nanofiltration device 6 is connected with the first collection device 1, the sodium sulfate solution can flow back to the first collection device 1;
the waste liquid port of the nanofiltration device 6 can also be connected with an electrolytic bath for electrolyzing sodium chloride solution and obtaining gas property recovery resources.
The air inlet pipeline 7 and the air outlet pipeline 8 are respectively used for inputting and discharging tail gas of the sulfuric acid process titanium white calcining kiln; the temperature of the tail gas in the gas inlet pipeline 7 is 370-400 ℃, and the temperature of the tail gas obtained by the gas outlet pipeline 8 is 60-70 ℃.
The gas outlet pipeline 8 is connected with a titanium dioxide production workshop and is used for drying the raw material metatitanic acid; the tail gas of the titanium dioxide calcining kiln is treated by a filter press at the tail end of the gas outlet pipeline 8 and then is used for blowing hot air to dry the metatitanic acid raw material, so that the normal filter pressing water content can be reduced from 50% to 40% -50%, and the heat energy consumption of the metatitanic acid calcining kiln is reduced.
The crystal collecting device is used for collecting solid crystals accumulated at the bottom of the first spraying device 2, and the solid crystals are sodium sulfide crystals; and dissolving the sodium sulfide crystals by the sodium sulfate waste liquid to obtain a sodium sulfate aqueous solution with the mass fraction of about 20%, and introducing the sodium sulfate aqueous solution into the second collecting device 3 after filter pressing by a filter press.
In addition, the devices can be connected by pipelines conventionally, and a plurality of water pumps are optionally arranged on the pipelines.
A specific embodiment will be given below for illustrating the specific component arrangement, use and operation flow in the tail gas utilization device of the titanium white calcining kiln of the sulfuric acid process of the present invention:
(1) the sodium sulfate waste liquid is collected into the first collecting device 1.
(2) The first spraying device 2 is a venturi; pumping the waste liquid in the first collecting device 1 into the top of the venturi tube through a water pump; meanwhile, tail gas of the titanium white calcining kiln in the gas inlet pipeline 7 enters the venturi tube through a gas inlet at the bottom of the first spraying device 2; the waste liquid and the tail gas are directly contacted and heat exchanged in the first spraying device 2; the sodium sulfate waste liquid at the bottom of the first spraying device 2 is directly discharged into the second collecting device 3.
(3) A charging opening and a stirring device are arranged in the second collecting device 3;
calcium chloride wastewater in the production process of titanium white by a chlorination process is put into the second collecting device 3; starting a stirring device to fully react; after the reaction is finished, the mixture is filtered to remove impurities and then pumped into the top of the second spraying device 4.
(4) After the first spraying device 2 works for a period of time, sodium sulfate crystals can be accumulated at the bottom of the venturi; opening a discharge hole at the bottom of the venturi, and transferring the sodium sulfate crystals to a crystal collecting device; and dissolving and crystallizing by using the waste liquid in the first collecting device 1, and pumping the obtained concentrated sodium sulfate solution into the second collecting device 3 after filter pressing.
(5) The second spraying device 4 adopts a venturi; pumping the liquid phase in the second collecting device 3 into the top of the venturi tube by a water pump; meanwhile, tail gas of the titanium white calcining kiln in the gas inlet pipeline 7 enters the venturi tube through a gas inlet at the bottom of the second spraying device 4; the liquid phase and the tail gas are directly contacted and heat exchanged in the second spraying device 4; the saturated brine at the bottom of the second spraying device 4 is directly discharged into the third collecting device 5.
(6) A charging opening and a stirring device are arranged in the third collecting device 5;
adding quantitatively prepared hydrogen peroxide into the third collecting device 5, and starting a stirring device to fully react to convert all sodium sulfite in the saturated brine into sodium sulfate; and after the reaction is finished, pumping saturated brine into a nanofiltration device 6.
(7) The nanofiltration device 6 is internally provided with nanofiltration membranes and other conventional nanofiltration components;
separating out the solution of sodium chloride and sodium sulfate by a nanofiltration device 6; wherein, the sodium sulfate solution is pumped back to the first collecting device 1 through a pipeline, and the sodium chloride solution is collected or is introduced into an electrolytic bath for electrolysis.
(8) The tail end of the gas outlet pipeline 8 is provided with a filter press;
after filter pressing, the titanium white powder is introduced into a titanium white powder production workshop for drying the metatitanic acid raw material.
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the above examples are intended to illustrate, but not limit, the technical solutions of the present invention; those of ordinary skill in the art will understand that: modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced without departing from the spirit and scope of the present invention; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; it is therefore intended to cover in the appended claims all such alternatives and modifications that are within the scope of the invention.
Claims (10)
1. A tail gas utilization device of a titanium white calcining kiln of a sulfuric acid method is characterized by comprising a first collecting device, a first spraying device, a second collecting device, a second spraying device, a third collecting device, a nanofiltration device, an air inlet pipeline and an air outlet pipeline which are connected in sequence;
the liquid outlet of the nanofiltration device is connected with the first collection device;
the air inlet pipeline is connected with the bottoms of the first spraying device and the second spraying device at the same time, and the air outlet pipeline is connected with the tops of the first spraying device and the second spraying device at the same time.
2. The tail gas utilization device of the sulfuric acid process titanium dioxide calcining kiln according to claim 1, characterized by further comprising a crystal collecting device for collecting solid crystals accumulated at the bottom of the first spraying device;
the liquid inlet of the crystallization collecting device is connected with the first collecting device;
and the liquid outlet of the crystallization collecting device is connected with the second collecting device.
3. The tail gas utilization device for the sulfuric acid process titanium dioxide calcining kiln according to claim 2, characterized in that a pressure filter is arranged on a pipeline connecting the crystallization collecting device and the second collecting device.
4. The tail gas utilization device for the titanium dioxide calcining kiln in the sulfuric acid process according to claim 1, wherein the first spraying device and/or the second spraying device comprises one of a spraying tower or a venturi tube.
5. The tail gas utilization device for the titanium white calcining kiln in the sulfuric acid process according to claim 1, characterized in that the second collecting device and/or the third collecting device is provided with an open port for adding a medicament or sampling in real time.
6. The device for utilizing the tail gas of the sulfuric acid process titanium dioxide calcining kiln according to claim 1, characterized in that a stirring device is arranged in the second collecting device and/or the third collecting device.
7. The tail gas utilization device of the sulfuric acid process titanium dioxide calcining kiln according to claim 1, characterized in that a waste liquid port of the nanofiltration device is connected with an electrolytic bath.
8. The device for utilizing the tail gas of the sulfuric acid process titanium dioxide calcining kiln according to claim 1, wherein the gas outlet pipeline is connected with a titanium dioxide production workshop and is used for drying raw material metatitanic acid.
9. The tail gas utilization device for the sulfuric acid process titanium dioxide calcining kiln according to claim 1, characterized in that a filter press is arranged at the tail end of the gas outlet pipeline.
10. The device for utilizing the tail gas of the titanium white calcining kiln in the sulfuric acid process according to claim 1, characterized in that the first collecting device is connected with an iron-based pigment production workshop and is used for collecting the sodium sulfate waste liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221097273.9U CN217430835U (en) | 2022-05-09 | 2022-05-09 | Tail gas utilization device of sulfuric acid process titanium dioxide calcining kiln |
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| CN202221097273.9U CN217430835U (en) | 2022-05-09 | 2022-05-09 | Tail gas utilization device of sulfuric acid process titanium dioxide calcining kiln |
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