Novel debenzolization tower for coking chemical products
阅读说明:本技术 焦化化产新型脱苯塔 (Novel debenzolization tower for coking chemical products ) 是由 李波 李婵 李凯 侯建国 李斌 宋亚波 李幸 于 2019-09-20 设计创作,主要内容包括:本发明涉及焦化工业富油粗苯蒸馏设备领域,提供一种焦化化产新型脱苯塔,采用减压或负压水蒸汽提馏的方法,在塔上设计了油气入口,使从贫油出口流出的热贫油作为热源从油气入口再次进入脱苯塔,大大减少了对作为热源的水蒸气的依赖,明显减少了通入脱苯塔的过热蒸汽,降低了废水量;设计了回油口,使从油水出口流出的油水混合物经过油水分离后从回油口再次进入精馏段内,进行再次解析精馏,提高苯与萘油的回收率;塔体上还设置有多处温度监测口,分别检测各个萘油收集口的温度,有利于掌握精馏段内的温度分布,及时调整入塔的热源,保证萘油收集质量。(The invention relates to the field of crude benzene distillation equipment of rich oil in the coking industry, and provides a novel debenzolization tower for coking chemical production, wherein a method of reduced pressure or negative pressure steam stripping is adopted, an oil gas inlet is designed on the tower, so that hot lean oil flowing out of a lean oil outlet is used as a heat source and enters the debenzolization tower again from the oil gas inlet, the dependence on the steam used as the heat source is greatly reduced, the superheated steam introduced into the debenzolization tower is obviously reduced, and the wastewater amount is reduced; an oil return port is designed, so that an oil-water mixture flowing out of an oil-water outlet enters the rectification section again from the oil return port after oil-water separation, and is subjected to desorption rectification again, and the recovery rate of benzene and naphthalene oil is improved; the tower body is also provided with a plurality of temperature monitoring ports for respectively detecting the temperature of each naphthalene oil collecting port, which is favorable for mastering the temperature distribution in the rectifying section, timely adjusts the heat source entering the tower and ensures the naphthalene oil collecting quality.)
1. A novel debenzolization tower for coking production comprises a tower body (1), wherein the tower body (1) is formed by connecting a rectifying section (2) at the upper part and a stripping section (3) at the lower part, a sealing cover is arranged at the top of the rectifying section (2), a tower kettle is arranged at the bottom of the stripping section (3), the tower kettle is arranged on a skirt, a plurality of layers of tower trays or fillers are arranged in the tower body of the rectifying section (2) and the stripping section (3), the novel debenzolization tower is characterized in that an oil-rich inlet (4) is arranged on the side wall of the tower body at the connecting part of the rectifying section (2) and the stripping section (3), an oil-gas inlet (6) and an overheated steam inlet (7) are arranged on the side wall of the tower body at the lower part of the stripping section (3), an oil-poor-outlet (10) is arranged at the bottom of the tower, a tower bottom pressure gauge interface (17-2) and a tower bottom, a liquid level meter upper interface and a liquid level meter lower interface are also arranged below the rich oil inlet (4); a plurality of naphthalene oil side line outlets are formed in the tower wall in the middle of the rectifying section (2), each naphthalene oil side line outlet is connected with a corresponding tower disc layer or a corresponding packing layer, and a thermometer interface is arranged at the position corresponding to each naphthalene oil outlet; a crude benzene reflux port (8), an oil return port (9) and an oil-water outlet (13) are arranged on the tower wall at the upper part of the rectifying section (2), a gas-phase communication hole (14) is also arranged on the tower wall above the oil-water outlet (13), the oil-water outlet (13) and the crude benzene reflux port (8) are respectively connected with the uppermost tower disc layer or the packing layer, and the oil return port (9) is connected with the tower disc layer or the packing layer below the crude benzene reflux port (8); the sealing cover is provided with a benzene steam outlet (11) and a diffusing port (20), and is also provided with a tower top pressure interface (17-1) and a tower top temperature interface (18-1).
2. The coking chemical production novel debenzolization tower as recited in claim 1, characterized in that twenty layers of vertical sieve trays are installed in the tower body of the rectification section (2).
3. The coking chemical production novel debenzolization tower as claimed in claim 2, wherein four side outlets of naphthalene oil are correspondingly connected with a fifteenth layer, a thirteenth layer, a eleventh layer and a ninth layer of vertical sieve tray from bottom to top in sequence.
4. The coking chemical production novel debenzolization tower as recited in claim 2, characterized in that the oil-water outlet (13) and the crude benzene return port (8) are respectively connected with the two sides of the tray at the uppermost layer, and the oil return port (9) is connected with the tray at the second layer.
5. The coking and chemical production novel debenzolization tower as recited in claim 1, characterized in that the tower body of the stripping section (3) is internally provided with ten layers of stainless steel perforated plate corrugated packing.
6. The novel debenzolization tower for coking production according to claim 1, characterized in that a tower top manhole (21-1) and a rectifying section manhole (21-2) are respectively arranged on the tower wall at the top and the middle of the rectifying section (2), a stripping section manhole (21-3) is arranged on the tower wall at the top of the stripping section (3), and a tower bottom manhole (21-4) is arranged on the tower wall at the top of the tower kettle.
Technical Field
The invention relates to the field of crude benzene distillation equipment for rich oil in coking industry, in particular to a novel debenzolization tower for coking chemical products.
Background
In the coking industry, coke oven gas generated in the coal coking process generally contains about 25-35g/Nm of benzene 3The benzene content after recovery is usually 0.4 to 0.6%. In order to better recycle the crude benzene, the benzene hydrocarbon in the coal gas is recycled by washing and absorbing equipment and using high-boiling-point wash oil as a washing and absorbing agent, the wash oil is changed into rich oil after absorbing the benzene, then the rich oil is distilled to separate out the crude benzene, and the rich oil is changed into the wash oil or called lean oil after being distilled and debenzolized. Most of the domestic debenzolization processes mainly adopt a method of reduced pressure or negative pressure steam stripping, high-temperature steam is used as a heat source, the partial pressure of oil steam is reduced, the gasification temperature of the benzene hydrocarbon in rich oil is reduced, and components such as crude benzene, naphthalene oil and the like are stripped and evaporated at a lower temperature. However, in the prior art, the same amount of waste water containing harmful substances of phenols is generated by water vapor, the waste water is difficult to treat, the treatment cost is very high, and the defects of low quality of recovered products, low recovery rate, high production consumption and the like exist.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel debenzolization tower for coking chemical products, which can reduce the consumption of water vapor and effectively improve the quality and the recovery efficiency of recovered products.
The technical scheme of the invention is that a novel debenzolization tower produced by coking is provided, which comprises a tower body, wherein the tower body is formed by connecting a rectifying section at the upper part and a stripping section at the lower part, a sealing cover is arranged at the top of the rectifying section, a tower kettle is arranged at the bottom of the stripping section, the tower kettle is arranged on a skirt, a plurality of layers of tower trays or fillers are arranged in the tower body of the rectifying section and the stripping section, an oil-rich inlet is arranged on the side wall of the tower body at the connecting part of the rectifying section and the stripping section, an oil-gas inlet and an overheated steam inlet are arranged on the side wall of the tower body below the tower trays or the fillers in the stripping section, a lean oil outlet is arranged at the bottom of the tower kettle, a tower bottom pressure gauge interface and a tower bottom thermometer interface are arranged at the lower part of the stripping section; a plurality of naphthalene oil side line outlets are formed in the tower wall in the middle of the rectifying section, each naphthalene oil side line outlet is connected with a corresponding tower disc layer or a corresponding packing layer, and a thermometer interface is arranged at the position corresponding to each naphthalene oil outlet; a crude benzene reflux port, an oil return port and an oil-water outlet are formed in the tower wall at the upper part of the rectifying section, a gas-phase communication hole is formed in the tower wall above the oil-water outlet, the oil-water outlet and the crude benzene reflux port are respectively connected with the uppermost tower disc layer or the packing layer, and the oil return port is connected with the tower disc layer or the packing layer below the crude benzene reflux port; the sealing cover is provided with a benzene steam outlet and a diffusing port, and the sealing cover is also provided with a tower top pressure interface and a tower top temperature interface.
Compared with the prior art, the invention has the following advantages:
the novel debenzolization tower for coking and chemical production adopts a method of reduced pressure or negative pressure steam stripping, and is also provided with an oil gas inlet, so that hot lean oil flowing out of a lean oil outlet is used as a heat source and enters the debenzolization tower again from the oil gas inlet, the dependence on the steam used as the heat source is greatly reduced, the superheated steam introduced into the debenzolization tower is obviously reduced, and the amount of wastewater is reduced; an oil return port is also designed, so that an oil-water mixture flowing out of the oil-water outlet enters the rectification section again from the oil return port after oil-water separation, and is subjected to desorption rectification again, and the recovery rate of benzene and naphthalene oil is improved; the tower body of the novel debenzolization tower for coking and chemical production is provided with a plurality of temperature monitoring ports for respectively detecting the temperature of each naphthalene oil collecting port, which is favorable for mastering the temperature distribution in the rectifying section, timely adjusts the heat source entering the tower and ensures the naphthalene oil collecting quality.
Preferably, twenty layers of vertical sieve tray trays are arranged in the tower body of the rectifying section.
Preferably, four side outlets of the naphthalene oil are arranged and are correspondingly connected with a fifteenth layer, a thirteenth layer, a eleventh layer and a ninth layer of vertical sieve tray from bottom to top in sequence.
Preferably, the oil-water outlet and the crude benzene reflux port are respectively connected to two sides of the tray on the uppermost layer, and the oil return port is connected with the tray on the second layer.
Preferably, ten layers of stainless steel perforated plate corrugated fillers are arranged in the tower body of the stripping section.
Preferably, a tower top manhole and a rectifying section manhole are respectively arranged on the tower walls at the top and the middle part of the rectifying section, a stripping section manhole is arranged on the tower wall at the top of the stripping section, and a tower bottom manhole is arranged on the tower wall at the top of the tower kettle. Manholes are arranged at each part in the tower, so that the top and the middle of the rectifying section and the top and the bottom of the stripping section can be cleaned conveniently, and tar hardened in the tower body can be removed in time.
Drawings
FIG. 1 is a schematic structural diagram of a novel debenzolization tower for coking and chemical production.
As shown in fig. 1: 1. a tower body, 2, a rectifying section, 2-1, a vertical sieve tray, 3, a stripping section, 4, a rich oil inlet, 5, a groove distributor, 6, an oil gas inlet, 7, a superheated steam inlet, 8, a crude benzene reflux port, 9, an oil return port, 10, a lean oil outlet, 11, a benzene steam outlet, 12-1, a first naphthalene oil outlet, 12-2, a second naphthalene oil outlet, 12-3, a third naphthalene oil outlet, 12-4, a fourth naphthalene oil outlet, 13, an oil water outlet, 14, a gas phase communication hole, 15-1, an on-site liquid level meter upper interface, 15-2, an on-site liquid level meter lower interface, 16-1, a liquid level meter upper interface, 16-2, an instrument liquid level meter lower interface, 17-1, a tower top interface, 17-2, a tower bottom interface, 18-1 and a tower top thermometer interface, 18-2 parts of a middle tower thermometer interface, 18-3 parts of a tower bottom thermometer interface, 19-1 parts of a first thermometer interface, 19-2 parts of a second thermometer interface, 19-3 parts of a third thermometer interface, 19-4 parts of a fourth thermometer interface, 20 parts of a dispersion port, 21-1 parts of a tower top manhole, 21-2 parts of a rectification section manhole, 21-3 parts of a stripping section manhole, 21-4 parts of a tower bottom manhole, 22 parts of a skirt inlet.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.
In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "including," and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Further, when a statement such as "… at least one" appears after the list of listed features, the entire listed feature is modified rather than modifying individual elements in the list.
As shown in figure 1, the novel debenzolization tower for coking chemical products comprises a tower body 1, wherein the tower body 1 is formed by connecting a rectifying
The novel debenzolization tower for coking chemical products is used for carrying out rich oil debenzolization, and the specific process comprises the following steps:
the
In the novel debenzolization tower for coking and chemical production, the gas-
The novel debenzolization tower for coking and chemical production adopts a method of reduced pressure or negative pressure steam stripping, and is also provided with the
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