CN210186834U - System for utilize high sulfur nitrogen flue gas to realize phenolate decomposition - Google Patents
System for utilize high sulfur nitrogen flue gas to realize phenolate decomposition Download PDFInfo
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- CN210186834U CN210186834U CN201920616459.2U CN201920616459U CN210186834U CN 210186834 U CN210186834 U CN 210186834U CN 201920616459 U CN201920616459 U CN 201920616459U CN 210186834 U CN210186834 U CN 210186834U
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Abstract
The utility model relates to a system for realizing the decomposition of phenolate by utilizing high-sulfur nitrogen flue gas, which comprises a decomposition tower, a decomposition separation tank, a lime slaker, a mud clarifier and an oil-water separator; the upper part of the decomposition tower is provided with a crude phenolate inlet, the lower part of the decomposition tower is provided with a flue gas inlet, and a gas phase outlet at the top of the decomposition tower is connected with an oil-water separation tank; the liquid phase outlet at the bottom of the decomposition tower is connected with a decomposition separation tank, the decomposition separation tank is provided with a crude phenol outlet and a sodium carbonate wastewater outlet, the sodium carbonate wastewater outlet is connected with a lime slaker, the lime slaker is provided with a quick lime inlet, an ash residue outlet and a slurry outlet, the slurry outlet is connected with a slurry clarifier, and the slurry clarifier is provided with a byproduct dilute alkali outlet and a byproduct slurry outlet. The utility model discloses in, the flue gas carries out acid-base reaction with crude phenolate after the pressurization and turns into the phenol type with it, and the azotic carbonate solution that contains sulphur and nitrogenous is turned into to the sulphur nitrogen in the flue gas simultaneously, then turns into the dilute alkali of byproduct and byproduct mud with the carbonate solution that contains sulphur, nitrogen.
Description
Technical Field
The utility model relates to a tar deep-processing and flue gas utilization technical field especially relate to a system for utilize high sulfur nitrogen flue gas to realize phenolate decomposition.
Background
The flue gas containing sulfur and nitrogen is the most concentrated pollution item in the current atmospheric environment protection, and from the currently operated industrialized desulfurization and denitrification devices, the scale of pollution treatment of desulfurization and denitrification is generally large, and the technical requirements for adjustment and control of each process link are severe, so that the overall operation cost is high. In addition, from the chemical analysis, carbon, sulfur and nitrogen in the sulfur-nitrogen flue gas mainly exist in oxidation state compounds, and the water solution state of the sulfur-nitrogen flue gas is acidic, so that if an occasion needing a large amount of acid gas is found in industrial application and the requirement on the chemical performance of the acid gas is not strict, the sulfur-nitrogen containing flue gas can be completely changed into valuable.
The phenol compound is used as an important product of coal tar, is usually converted into water-soluble salts by an alkaline method and separated from the coal tar, and is decomposed by a sulfuric acid method or a carbon dioxide and sulfuric acid method to prepare crude phenol. The decomposition of pure phenate by a sulfuric acid method is listed in the national regulation elimination process, and most enterprises adopt a carbon dioxide + sulfuric acid method to produce crude phenol at present. The method uses flue gas containing carbon dioxide to decompose net phenate, the decomposition rate can reach 95%, and then needs to add a small amount of dilute sulphuric acid to promote decomposition, so that the phenate is completely converted into crude phenol, and the decomposition by-product sodium carbonate aqueous solution is generally used as waste water and used for reclaimed water of other industries after being treated.
Disclosure of Invention
The utility model provides a system for utilize high sulfur nitrogen flue gas to realize phenolate decomposition, the flue gas carries out acid-base reaction with crude phenolate after the pressurization and turns into its phenol, and the sulfur nitrogen in the flue gas turns into the carbonate solution that contains sulphur and nitrogenous simultaneously, then turns into by-product dilute alkali and by-product mud with the carbonate solution that contains sulphur, nitrogen; the utility model realizes the comprehensive utilization of the smoke purification and the phenolate decomposition products, has simple process and low operation cost, and is suitable for large-scale tar deep processing enterprises.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for realizing the decomposition of phenolate by using high-sulfur nitrogen flue gas comprises a decomposition tower, a decomposition separation tank, a lime slaker, a slurry clarifier and an oil-water separator; one side of the upper part of the decomposition tower is provided with a crude phenolate inlet, the other side of the lower part of the decomposition tower is provided with a flue gas inlet, the flue gas inlet is connected with a chimney through a flue gas pipeline, and a flue gas fan is arranged on the flue gas pipeline; the top of the decomposition tower is provided with a gas phase outlet which is connected with the oil-water separation tank through a gas phase pipeline, and the gas phase pipeline is provided with a flue gas condensation cooler; the bottom of the decomposition tower is provided with a liquid phase outlet which is connected with a material inlet of the decomposition separation tank through a pipeline; the decomposition separation tank is provided with a crude phenol outlet and a sodium carbonate wastewater outlet, the sodium carbonate wastewater outlet is connected with a lime slaker through a pipeline, the lime slaker is provided with a quick lime feeding port, an ash discharging port and a slurry discharging port, the ash discharging port is connected with a screw conveyor, the slurry discharging port is connected with a slurry inlet of a slurry clarifier through a pipeline, and the slurry clarifier is provided with a byproduct diluted alkali outlet and a byproduct slurry outlet.
And stirring devices are respectively arranged in the lime slaker and the slurry clarifier.
The decomposing tower adopts a stainless steel packed tower.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model realizes phenolate decomposition by utilizing high sulfur nitrogen flue gas, realizes flue gas purification, saves flue gas desulfurization and denitration cost, reduces carbon emission, and is beneficial to atmospheric environment protection;
2) the sulfur dioxide in the flue gas mainly comes from fuels such as coal or coal gas, and the like, the utility model makes the use of high-sulfur power coal or high-sulfur coal gas as fuel possible, and can effectively reduce the cost of power consumption;
3) the temperature of flue gas at the outlet of the chimney is generally 100-250 ℃, the heat of the flue gas is pollution, and the flue gas needs to be cooled if discharged outwards according to an environmental protection method; the utility model directly uses the part of heat for removing neutral oil of phenate, thereby avoiding the consumption of low-pressure steam in the conventional phenate decomposition process;
4) because the flue gas at the outlet of the chimney does not need to be cooled after the system is adopted, the water vapor in the flue gas can not be condensed, and the sulfide and the nitride can not form strong acid solution such as dilute aqua regia and the like, the material of the flue gas pipeline does not need to be subjected to special antiseptic treatment, and the equipment cost can also be greatly reduced;
5) the high sulfur nitrogen flue gas and the raw material crude phenate are subjected to contact reaction in a countercurrent mode in the decomposition tower, so that the characteristics of strong weak acid gas in the flue gas can be fully exerted, and the problem that the phenate is not completely decomposed by carbon dioxide gas is fundamentally solved;
6) the byproduct sodium carbonate after the phenolate decomposition is subjected to causticization digestion reaction by using quick lime (calcium oxide), and the byproduct diluted alkali can be recycled for the separation process of phenols in tar fractions, so that the cost is further saved;
7) the sulfur and nitrogen pollutants in the flue gas are finally converted into calcium salt which is easy to precipitate, the sulfur and nitrogen can be effectively fixed, the pollution of the sulfur and nitrogen is reduced, and finally the calcium carbonate slurry containing trace calcium sulfate can be used for preparing building materials such as cement and the like, so that the maximum comprehensive utilization of products in the whole process is realized.
Drawings
Fig. 1 is a schematic structural diagram of a system for realizing decomposition of phenolate by using high sulfur nitrogen flue gas.
In the figure: 1. chimney 2, smoke fan 3, decomposition tower 4, smoke condensing cooler 5, oil-water separation tank 6, decomposition separation tank 7, lime slaker 8, mud clarifier 9, screw conveyer
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the system for decomposing phenolate by using high sulfur and nitrogen flue gas of the present invention includes a decomposition tower 3, a decomposition separation tank 6, a lime slaker 7, a mud clarifier 8 and an oil-water separator 5; a crude phenolate inlet is formed in one side of the upper part of the decomposition tower 3, a flue gas inlet is formed in the other side of the lower part of the decomposition tower 3, the flue gas inlet is connected with a chimney 1 through a flue gas pipeline, and a flue gas fan 2 is arranged on the flue gas pipeline; the top of the decomposition tower 3 is provided with a gas phase outlet which is connected with an oil-water separation tank 5 through a gas phase pipeline, and the gas phase pipeline is provided with a flue gas condensation cooler 4; the bottom of the decomposition tower 3 is provided with a liquid phase outlet which is connected with a material inlet of the decomposition separation tank 6 through a pipeline; the decomposition separation tank 6 is provided with a crude phenol outlet and a sodium carbonate wastewater outlet, the sodium carbonate wastewater outlet is connected with a lime slaker 7 through a pipeline, the lime slaker 7 is provided with a quick lime feeding port, an ash discharging port and a slurry discharging port, the ash discharging port is connected with a screw conveyor 9, the slurry discharging port is connected with a slurry inlet of a slurry clarifier 8 through a pipeline, and the slurry clarifier 8 is provided with a byproduct dilute alkali outlet and a byproduct slurry outlet.
And stirring devices are respectively arranged in the lime slaker 7 and the mud clarifier 8.
The decomposing tower 3 adopts a stainless steel packed tower, and raw material crude phenate and flue gas are in countercurrent contact on the surface of the packing.
SO in the high-sulfur nitrogen flue gas2The mass percent of the nitrogen-containing gas is more than or equal to 2 percent, and NOXThe mass percentage content of the active carbon is more than or equal to 0.5 percent; the high sulfur and nitrogen flue gas is hereinafter referred to as flue gas; the working process of the system for realizing the decomposition of the phenolate by utilizing the high-sulfur nitrogen flue gas is as follows:
1) introducing the pressurized flue gas into the decomposition tower 3 from the bottom of the decomposition tower 3, and introducing raw material crude phenate from the top of the decomposition tower 3; the raw material crude phenate is in countercurrent contact with flue gas, residual gas phase and water-containing neutral oil after reaction escape from the top of the decomposition tower together, the gas phase mainly comprises carbon dioxide, nitrogen and water vapor, and the gas phase and the water-containing neutral oil are condensed and cooled and then are converted into liquid phase to enter an oil-water separation tank 5 for oil-water separation;
2) the liquid phase flowing out of the bottom of the decomposition tower mainly comprises sodium carbonate wastewater containing a small amount of sodium sulfate and crude phenol, and the liquid phase enters a decomposition separation tank 6 to separate the sodium carbonate wastewater from the crude phenol;
3) adding quicklime into the separated sodium carbonate wastewater containing sulfur and nitrogen, converting the quicklime into alkali and calcium salt slurry containing sulfur through digestion and causticization reactions, clarifying the calcium salt slurry, separating a byproduct diluted alkali and a byproduct slurry, returning the byproduct diluted alkali to the tar processing process to be used as a dephenolizing aid for each fraction, wherein the main component of the byproduct slurry is calcium carbonate containing a small amount of calcium sulfate, and the byproduct slurry is used for preparing building cement after vacuum pressure filtration, washing and drying.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this embodiment, the specific process of using the high sulfur nitrogen flue gas to realize the decomposition of the phenate is as follows:
1) the high sulfur nitrogen flue gas from the bottom of the chimney 1 is firstly led to a flue gas fan 2, and the original pipeline of the chimney 1 for connecting the air diffusing pipeline with the desulfurization and denitrification system can be reserved for standby. The pressure of the high-sulfur and high-nitrogen flue gas pressurized by the flue gas fan 2 is generally increased by 10-20 kPa, and meanwhile, the temperature of the flue gas is also increased by about 10 ℃, so that water vapor cannot be condensed in the process because the temperature and the pressure of the flue gas are increased;
2) the pressurized high sulfur nitrogen flue gas enters the decomposition tower 3 from a connector at one side of the bottom of the decomposition tower 3, the raw material crude phenate enters the decomposition tower 3 from a connector at the other side of the upper part of the decomposition tower 3, and the decomposition tower 3 adopts a stainless steel packed tower. The two-phase materials are in countercurrent contact in the decomposing tower 3, crude phenolate flows through the surface of the packing from top to bottom, and the high-sulfur nitrogen flue gas is reacted with the crude phenolate from bottom to top and then escapes from the top of the decomposing tower 3.
3) When the flue gas flows upwards, most of the initially contacted crude phenolate is converted into crude phenol, and only about 10% of phenolate which cannot be decomposed by carbon dioxide exists, and at the moment, the fresh high-sulfur nitrogen flue gas contains a certain amount of sulfur oxide with stronger acidity and a small amount of nitrogen oxide, so that the high-sulfur nitrogen flue gas is very suitable for treating low-concentration phenolate.
4) As the flue gas continues to flow upward in the decomposition tower 3, the sulfur oxides and nitrogen oxides therein are quickly depleted, most of the remaining carbon dioxide begins to participate in the phenolate decomposition, and the chemical reaction in the upper region is also the main reaction region of the whole phenolate decomposition process. In the reaction zone, in order to ensure complete decomposition of phenate, a proper amount of high sulfur nitrogen flue gas can be introduced.
5) The gas phase discharged from the top of the decomposition tower 3 mainly comprises carbon dioxide, nitrogen, water vapor and neutral oil, the temperature is generally 70-80 ℃, and a small amount of liquid water or oil can be entrained. After the gas phase is cooled by cooling water in the flue gas condensing cooler 4, the neutral oil and water of the condensate and the purified flue gas enter an oil-water separation tank to be separated into gas, water and oil, and the separated neutral oil can be used as fuel oil or other purposes.
6) The liquid phase discharged from the bottom of the decomposing tower 3 is mainly sodium carbonate waste water (containing a small amount of sodium sulfate) and crude phenol, the oil phase and the water phase can be thoroughly separated in a decomposing and separating tank 6, and the separated crude phenol can be further used for processing and producing various refined phenols.
7) The quick lime (calcium oxide) and the sodium carbonate wastewater are subjected to digestion and causticization reaction in a lime slaker 7, and the sodium salt solution with high solubility is converted into calcium salt with low solubility, so that the dilute alkali liquor and the calcium salt slurry are favorably separated in a slurry clarifier 8 by the calcium salt (such as calcium carbonate and calcium sulfate) in a precipitation mode.
8) The separated by-product diluted alkali can be circularly returned to the dephenolizing auxiliary agent used for each fraction in the tar processing process, most of the by-product slurry is calcium carbonate (containing a small amount of calcium sulfate), and the by-product slurry can be used for producing building cement after being subjected to vacuum pressure filtration, washing and drying.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (2)
1. A system for realizing the decomposition of phenolate by using high-sulfur nitrogen flue gas is characterized by comprising a decomposition tower, a decomposition separation tank, a lime slaker, a slurry clarifier and an oil-water separator; one side of the upper part of the decomposition tower is provided with a crude phenolate inlet, the other side of the lower part of the decomposition tower is provided with a flue gas inlet, the flue gas inlet is connected with a chimney through a flue gas pipeline, and a flue gas fan is arranged on the flue gas pipeline; the top of the decomposition tower is provided with a gas phase outlet which is connected with the oil-water separation tank through a gas phase pipeline, and the gas phase pipeline is provided with a flue gas condensation cooler; the bottom of the decomposition tower is provided with a liquid phase outlet which is connected with a material inlet of the decomposition separation tank through a pipeline; the decomposition separation tank is provided with a crude phenol outlet and a sodium carbonate wastewater outlet, the sodium carbonate wastewater outlet is connected with a lime slaker through a pipeline, the lime slaker is provided with a quick lime feeding port, an ash discharging port and a slurry discharging port, the ash discharging port is connected with a screw conveyor, the slurry discharging port is connected with a slurry inlet of a slurry clarifier through a pipeline, and the slurry clarifier is provided with a byproduct diluted alkali outlet and a byproduct slurry outlet.
2. The system for decomposing phenol salt by using flue gas containing high sulfur and nitrogen content as claimed in claim 1, wherein the lime slaker and the slurry clarifier are respectively provided with a stirring device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920616459.2U CN210186834U (en) | 2019-04-30 | 2019-04-30 | System for utilize high sulfur nitrogen flue gas to realize phenolate decomposition |
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| CN201920616459.2U CN210186834U (en) | 2019-04-30 | 2019-04-30 | System for utilize high sulfur nitrogen flue gas to realize phenolate decomposition |
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