CN212152190U - Coal tar three-tower continuous deep processing system - Google Patents
Coal tar three-tower continuous deep processing system Download PDFInfo
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- CN212152190U CN212152190U CN202020027059.0U CN202020027059U CN212152190U CN 212152190 U CN212152190 U CN 212152190U CN 202020027059 U CN202020027059 U CN 202020027059U CN 212152190 U CN212152190 U CN 212152190U
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Abstract
The utility model relates to a three-tower continuous deep processing system for coal tar, which comprises a dehydration tower, a fraction tower and an industrial naphthalene rectifying tower, wherein the dehydration tower and the fraction tower are respectively supplied with heat by a convection section and a radiation section of a 1# tubular heating furnace, and the industrial naphthalene rectifying tower is supplied with heat by a 2# tubular heating furnace; the dehydration tower, the distillation tower and the industrial naphthalene rectification tower are sequentially connected through pipelines, the dehydration tower and the distillation tower are respectively connected with the convection section and the radiation section of the No. 1 tubular heating furnace, and the industrial naphthalene rectification tower is connected with the No. 2 tubular heating furnace; the top of the distillation column is provided with a dephlegmator, the tops of the dehydrating column and the industrial naphthalene rectification column are provided with a condensing cooler, a reflux tank and a reflux pump, the bottoms of the dehydrating column, the distillation column and the industrial naphthalene rectification column are provided with a heat exchanger, a distillation delivery pump and a circulating pump, and all the devices are connected through pipelines. The utility model discloses be particularly suitable for large-scale coal tar processing engineering.
Description
Technical Field
The utility model belongs to tar processing field, concretely relates to three towers of coal tar are deep processing system in succession.
Background
Coal tar is called tar for short, is a liquid product generated in the processes of dry distillation and vaporization of coal, is black or black brown viscous liquid with pungent odor, and is a raw material for producing a series of aromatic hydrocarbons, industrial oil, motor pitch and the like.
Tar distillation is the most basic method for segmenting tar under industrial conditions. Generally consists of a series of chemical unit operations such as heating, evaporation, distillation, condensation and cooling. From the domestic coal tar distillation process, the coal tar processing technology commonly adopted by domestic coke-oven plants is one-tower and two-tower tar distillation process, the dephenolization of the fraction is washed by NAOH, the washed three mixtures are sent to an industrial naphthalene working section, and the industrial naphthalene distillation commonly adopts single-furnace double-tower and double-furnace double-tower processes. The technology has the technical characteristics that the technology is mature and stable, the defects are that the technology is operated under normal pressure and the energy consumption is high, the three-mixed fraction is washed by using NAOH to generate the sodium phenolate, and the sodium phenolate needs to be decomposed if the phenol product is extracted. The sodium phenolate decomposition generally adopts a sulfuric acid decomposition method and a carbon dioxide decomposition method, the reaction for decomposing the sodium phenolate by the sulfuric acid method is a heat release process, and a large amount of water is vaporized to form steam to carry sulfuric acid and phenols to be released into the atmosphere when acid is added, so that the environment is polluted, and the sulfuric acid and the phenol products are lost; no waste liquid and acid gas are discharged in the process of the dioxide decomposition, but the equipment investment is large, and a certain amount of calcium carbonate waste is generated in the decomposition process.
Chinese patent CN106367110A discloses an energy-saving tar processing technology in 2017, No. 02/01, which is characterized in that the traditional tar distillation, phenol washing, industrial naphthalene distillation and asphalt modification are used as a system to perform heat exchange network design, and the technology has the advantages of recycling waste heat based on the original technology, reducing energy consumption, and having the disadvantages of remaining phenol washing section and not solving the environmental pollution caused by phenol washing process.
Chinese patent CN106977361A discloses a method for producing industrial naphthalene by using unwashed tertiary mixed technology in 2017, month 07 and 25, which is characterized in that the unwashed tertiary mixed technology is directly used for industrial naphthalene production, and has the advantages of solving the problem of environmental pollution caused by phenol washing process, and having the disadvantages that tar distillation and industrial naphthalene distillation are not designed as a system, and tar distillation and industrial naphthalene distillation are designed as a system, so that the waste heat of products in the process and the raw material heat exchange can be fully utilized, the heat exchange network design is optimized, and the overall energy consumption is reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the characteristics of the existing domestic and foreign tar distillation process and the problems to be solved, according to the embodiment of the utility model, a brand-new coal tar three-tower continuous deep processing system which can effectively solve the environmental pollution and reduce the energy consumption is hopefully provided.
According to the embodiment, the utility model provides a three-tower continuous deep processing system of coal tar, its innovation point lies in, including a dehydration tower, a fraction tower, an industry naphthalene rectifying column, dehydration tower and fraction tower are respectively by the convection section and the radiation section heat supply of 1# tubular heating furnace, industry naphthalene rectifying column is by the heat supply of 2# tubular heating furnace; the dehydration tower, the distillation tower and the industrial naphthalene rectification tower are sequentially connected through pipelines, the dehydration tower and the distillation tower are respectively connected with the convection section and the radiation section of the No. 1 tubular heating furnace, and the industrial naphthalene rectification tower is connected with the No. 2 tubular heating furnace; the top of the distillation column is provided with a dephlegmator, the tops of the dehydrating column and the industrial naphthalene rectification column are provided with a condensing cooler, a reflux tank and a reflux pump, the bottoms of the dehydrating column, the distillation column and the industrial naphthalene rectification column are provided with a heat exchanger, a distillation delivery pump and a circulating pump, and all the devices are connected through pipelines.
Preferably, in the utility model, the material of the upper part of the fractionating tower adopts 1.4529 alloy or 904 stainless steel; the material of the naphthalene primary tower and the material of the naphthalene fine tower are 1.4529 alloy; the tower kettle of the fraction tower is provided with a partition board, so that the thermal polymerization of the produced soft asphalt in the tubular furnace caused by overlong circulation time is avoided in the process, and the high-quality asphalt with low secondary quinoline insoluble substances can be produced.
Preferably, the utility model discloses in, dehydration tower, fractionating tower, naphthalene first tower, the fine tower of naphthalene be the plate tower, the dehydration tower is equipped with 10 ~ 20 column plates, the fractionating tower is equipped with 20 ~ 40 column plates, industry naphthalene rectifying column is equipped with 80 ~ 100 column plates.
Preferably, in the utility model discloses, 1# tubular heating furnace and 2# tubular heating furnace be vertical coil pipe cylinder stove.
Preferably, in the utility model discloses in, dephlegmator, condensation cooler, heat exchanger be shell and tube.
By the utility model discloses, raw materials tar atmospheric pressure operation desorption moisture obtains light oil in the dehydration tower, and decompression operation obtains light phenol naphthalene washing miscella and pitch fraction in the fractionating tower, obtains phenol oil, crude naphthalene and washing oil product at industry naphthalene rectifying column decompression operation, and crude naphthalene to the industrial naphthalene of different qualities of naphthalene fractional crystallization production.
The utility model discloses owing to adopted above technical scheme, make it compare with prior art, have following characteristics:
1. the tar distillation and the industrial naphthalene distillation are taken as a system and are completed by three towers, so that the distillate washing section is reduced compared with the traditional process, and the problems of environmental pollution and solid waste residue in the existing phenol washing process are solved.
2. The dehydration tower adopts crude benzene reflux operation, and the azeotropic property of the crude benzene and water improves the dehydration efficiency of the dehydration tower, thereby being beneficial to subsequent distillation operation.
3. The distillation tower is operated under reduced pressure, the operation temperature of the tower kettle is reduced, and the quality of the asphalt and the carbon black oil is improved. The top of the fractionating tower adopts a dephlegmator to exchange heat with the raw material tar for condensation, thereby not only recovering waste heat, but also condensing the mixed oil gas with tar of more than 85 ℃ to avoid the partial condensation and crystallization of the mixed oil gas with higher naphthalene content.
4. Because the mixed fraction is directly cut from the top of the fractionating tower, the separation is easier compared with the three mixed fractions cut from the lateral line in the traditional process, the tower plate number and the reflux ratio of the fractionating tower are both reduced, and the energy consumption is saved.
5. The decompression operation of the industrial naphthalene rectifying tower is beneficial to the separation of fractions, reduces the energy consumption, reduces the leakage of regional industrial naphthalene gas by the decompression operation, and is environment-friendly.
6. The utility model discloses design tar distillation and industrial naphthalene distillation as a system, through the analysis of heat transfer network, compare former tradition and separately the workshop section technology and reduced 15 ~ 20% energy consumption to the investment has been reduced.
7. The coarse naphthalene crystallization adopts a fractional crystallization process, the process flow and equipment are simple, waste gas, waste water and waste residue are not generated, the product quality can be adjusted by using the crystallization cycle number, the flexibility is high, and 90-99.2% of naphthalene products can be prepared.
8. The softening point of the product at the bottom of the fractionating tower is adjustable, and the product is used for producing needle coke and high-quality carbon material products in a matching way.
To sum up, through the utility model discloses three tower continuous deep-processing systems of coal tar's process flow is short, and the investment is low, has reduced the energy consumption, and area is little, and all can be adjusted in a flexible way as required by industrial naphthalene product and pitch product.
Drawings
FIG. 1 is a schematic structural diagram of a three-tower continuous deep processing system for coal tar.
Detailed Description
The invention will be further elucidated with reference to the drawings and the embodiments. These examples are to be understood as merely illustrative of the present invention and not as limiting the scope of the invention. After reading the description of the present invention, those skilled in the art can make various changes and modifications to the present invention, and these equivalent changes and modifications also fall within the scope of the present invention defined by the claims.
As shown in FIG. 1, the structure of the coal tar three-tower continuous deep processing system is schematically shown.
As shown in fig. 1, the raw material coal tar is preheated by a condenser 219 through pumping and then enters a dehydration tower 201, the dehydration tower is operated under normal pressure, light oil gas produced at the top of the dehydration tower is cooled by a light oil condensing cooler 214 and then enters an oil-water separator 218, an oil phase is separated and enters a reflux tank 216 of the dehydration tower, crude benzene is added into the reflux tank, part of the crude benzene is refluxed by a reflux pump 210 of the dehydration tower, and part of the crude benzene is output as a product; part of the anhydrous tar at the bottom of the dehydrating tower 201 is sent to a No. 1 tubular heating furnace 212 through a dehydrating tower circulating pump 207 to be heated in a convection section and returned to the bottom of the dehydrating tower to provide heat for the dehydrating tower, and part of the anhydrous tar is extracted through an anhydrous tar conveying pump 204.
The anhydrous tar extracted by the anhydrous tar delivery pump 204 enters an anhydrous tar/asphalt heat exchanger 220 to exchange heat with asphalt, and then is sent to the lower part of a fraction tower 202, the pressure of the fraction tower is reduced, the top of the fraction tower adopts a dephlegmator 219 to partially condense and reflux, and the mixed oil gas extracted from the top of the tower is directly sent to the bottom of an industrial naphthalene rectifying tower 203; and a part of asphalt at the bottom of the fractionating tower 202 is sent to a radiation section of a No. 1 tubular heating furnace 212 through a fractionating tower circulating pump 208 to be heated and returned to the bottom of the fractionating tower to provide heat for the fractionating tower, and a part of asphalt is sent to an anhydrous tar/asphalt heat exchanger 220 through an asphalt conveying pump 205 to be used as asphalt or carbon black oil products after heat exchange.
The industrial naphthalene rectification tower 203 is operated under reduced pressure, light oil extracted from the tower top is cooled by a phenol oil condensing cooler 215, then enters an industrial naphthalene rectification tower reflux tank 217, partially reflows through an industrial naphthalene rectification tower reflux pump 211, and is extracted as a light oil product; industrial naphthalene extracted from the side line of the industrial naphthalene rectifying tower 203 is cooled by a naphthalene vaporization cooler 221 and then is sent to an industrial naphthalene fractional crystallization working section; part of the wash oil extracted from the tower bottom of the industrial naphthalene rectifying tower 203 is sent to a No. 2 tubular heating furnace 213 through an industrial naphthalene rectifying tower circulating pump 209 to be heated and returned to the industrial naphthalene rectifying tower bottom to provide heat, and part of the wash oil is sent to a wash oil cooler 222 through a wash oil delivery pump 206 to be cooled and then is used as a wash oil product.
The coarse naphthalene is crystallized step by step, the core equipment of the crystallization system is a square box type crystallizer, and the high-purity refined naphthalene product is obtained through fractional crystallization, the product quality can be adjusted by the crystallization cycle number, the flexibility is high, and 90-99.2% of naphthalene products can be prepared.
Example 1
According to the scheme shown in the figure 1 and the flow, the coal tar of a certain coke-oven plant is treated, the treatment capacity is 20 ten thousand tons of tar per year, and the specific technical operation indexes and the results are shown in the table 1.
Example 2
According to the figure 1 and the flow, the coal tar of a certain coke-oven plant is treated, the treatment capacity is 25 ten thousand tons of tar per year, and the specific technical operation indexes and results are shown in the table 1.
TABLE 1
Claims (7)
1. A three-tower continuous deep processing system for coal tar is characterized by comprising a dehydration tower, a fraction tower and an industrial naphthalene rectifying tower, wherein the dehydration tower and the fraction tower are respectively supplied with heat by a convection section and a radiation section of a No. 1 tubular heating furnace, and the industrial naphthalene rectifying tower is supplied with heat by a No. 2 tubular heating furnace; the dehydration tower, the distillation tower and the industrial naphthalene rectification tower are sequentially connected through pipelines, the dehydration tower and the distillation tower are respectively connected with the convection section and the radiation section of the No. 1 tubular heating furnace, and the industrial naphthalene rectification tower is connected with the No. 2 tubular heating furnace; the top of the distillation column is provided with a dephlegmator, the tops of the dehydrating column and the industrial naphthalene rectification column are provided with a condensing cooler, a reflux tank and a reflux pump, the bottoms of the dehydrating column, the distillation column and the industrial naphthalene rectification column are provided with a heat exchanger, a distillation delivery pump and a circulating pump, and all the devices are connected through pipelines.
2. The coal tar three-tower continuous deep processing system as claimed in claim 1, wherein the dehydration tower, the distillation tower and the industrial naphthalene rectification tower are all plate towers, the dehydration tower is provided with 10-20 tower plates, the distillation tower is provided with 20-40 tower plates, and the industrial naphthalene rectification tower is provided with 80-100 tower plates.
3. The coal tar three-tower continuous deep processing system according to claim 1, wherein the 1# tubular heating furnace and the 2# tubular heating furnace are both vertical coil tube cylindrical furnaces.
4. The coal tar three-tower continuous deep processing system according to claim 1, wherein the dephlegmator, the condensing cooler and the heat exchanger are all shell-and-tube type.
5. The continuous deep processing system of the coal tar three-tower as claimed in any one of claims 1 to 4, wherein the upper material of the fractionating tower is 1.4529 alloy or 904 stainless steel.
6. The coal tar three-tower continuous deep processing system as claimed in any one of claims 1 to 4, wherein the material of the industrial naphthalene rectification tower is 1.4529 alloy.
7. The coal tar three-tower continuous deep processing system as claimed in any one of claims 1 to 4, characterized in that a partition is arranged at the tower bottom of the distillation tower.
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| CN202020027059.0U CN212152190U (en) | 2020-01-07 | 2020-01-07 | Coal tar three-tower continuous deep processing system |
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| CN202020027059.0U CN212152190U (en) | 2020-01-07 | 2020-01-07 | Coal tar three-tower continuous deep processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113384912A (en) * | 2021-05-26 | 2021-09-14 | 中冶焦耐(大连)工程技术有限公司 | Negative pressure single-furnace single-tower industrial naphthalene rectification system and process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113384912A (en) * | 2021-05-26 | 2021-09-14 | 中冶焦耐(大连)工程技术有限公司 | Negative pressure single-furnace single-tower industrial naphthalene rectification system and process |
| CN113384912B (en) * | 2021-05-26 | 2024-05-14 | 中冶焦耐(大连)工程技术有限公司 | Negative pressure single-furnace single-tower industrial naphthalene rectification system and process |
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