阅读说明：本技术 催化重整节能系统、节能方法和催化重整反应系统 (Catalytic reforming energy-saving system, energy-saving method and catalytic reforming reaction system ) 是由 孙欢欢 经铁 崔新安 王洪彬 郭荣群 王雪 于珊珊 于 2019-11-15 设计创作，主要内容包括：本发明涉及催化重整技术领域,公开了一种催化重整节能系统、节能方法和催化重整反应系统。催化重整节能系统包括高压吸收罐、重整生成油稳定塔和第一换热器,高压吸收罐连通有底液输出管,底液输出管与重整生成油稳定塔的进料口连通,重整生成油稳定塔连通有底油输出管,底油输出管作为热源管道,底液输出管作为冷源管道与第一换热器连接。催化重整节能方法包括：利用重整生成油稳定塔产生的底油作为热源对高压吸收罐产生的底液进行换热。催化重整反应系统包括上述的催化重整节能系统。本发明提供的催化重整节能系统、方法和催化重整反应系统能减小系统负荷,降低系统能耗,实现资源节约。(The invention relates to the technical field of catalytic reforming, and discloses a catalytic reforming energy-saving system, an energy-saving method and a catalytic reforming reaction system. The catalytic reforming energy-saving system comprises a high-pressure absorption tank, a reformed product oil stabilizing tower and a first heat exchanger, wherein the high-pressure absorption tank is communicated with a bottom liquid output pipe, the bottom liquid output pipe is communicated with a feed inlet of the reformed product oil stabilizing tower, the reformed product oil stabilizing tower is communicated with a bottom oil output pipe, the bottom oil output pipe is used as a heat source pipeline, and the bottom liquid output pipe is used as a cold source pipeline and is connected with the first heat exchanger. The catalytic reforming energy-saving method comprises the following steps: and (3) exchanging heat for the bottom liquid generated by the high-pressure absorption tank by using the bottom oil generated by the reformed oil stabilizing tower as a heat source. The catalytic reforming reaction system comprises the catalytic reforming energy-saving system. The catalytic reforming energy-saving system, the catalytic reforming energy-saving method and the catalytic reforming reaction system provided by the invention can reduce the system load, reduce the system energy consumption and realize resource saving.)

1. A catalytic reforming energy-saving system is characterized by comprising a high-pressure absorption tank, a reformed oil stabilizing tower and a first heat exchanger,

the high-pressure absorption tank is communicated with a bottom liquid output pipe, the reformed product oil stabilizing tower is communicated with a bottom oil output pipe, the bottom oil output pipe is used as a heat source pipeline to be communicated with a heat flow channel of the first heat exchanger, the bottom liquid output pipe is used as a cold source pipeline to be communicated with a cold flow channel of the first heat exchanger, and the bottom liquid output pipe is communicated with a feed inlet of the reformed product oil stabilizing tower and is used for conveying bottom liquid to the reformed product oil stabilizing tower.

2. The catalytic reforming energy-saving system of claim 1, further comprising a second heat exchanger and a pre-fractionation discharge pipe communicated with the top of a pre-fractionation tower in a pretreatment unit of the catalytic reforming reaction system, wherein the pre-fractionation discharge pipe is used as a heat source pipeline and communicated with a heat flow channel of the second heat exchanger, and the bottom liquid output pipe is used as a cold source pipeline and communicated with a cold flow channel of the second heat exchanger.

3. The catalytic reforming economizer system of claim 2 wherein the second heat exchanger is located upstream of the first heat exchanger.

4. The catalytic reforming energy-saving system of claim 1, further comprising a second heat exchanger and a reformate output pipe communicated with a reforming reaction unit of the catalytic reforming reaction system, wherein the reformate output pipe is communicated with a hot flow channel of the second heat exchanger as a heat source pipeline, and the base liquid output pipe is communicated with a cold flow channel of the second heat exchanger as a cold source pipeline.

5. The catalytic reforming energy-saving system of claim 4, further comprising a reforming feed heat exchanger and a reforming feed inlet pipe communicated with the reforming pretreatment unit, wherein the reforming feed inlet pipe is used as a cold source pipeline and communicated with a cold flow channel of the reforming feed heat exchanger, the reformed product outlet pipe is used as a heat source pipeline and communicated with a heat flow channel of the reforming feed heat exchanger, and the reforming feed heat exchanger is arranged at the upstream of the second heat exchanger.

6. The catalytic reforming energy-saving system according to any one of claims 1 to 5, further comprising a heating furnace at the bottom of the stabilizer tower, wherein the reformate stabilizer tower is further communicated with a bottom oil return pipe, one end of the bottom oil return pipe is connected with the bottom of the reformate stabilizer tower, the other end of the bottom oil return pipe is connected with the lower part of the reformate stabilizer tower, and the middle part of the bottom oil return pipe is connected with the heating furnace at the bottom of the stabilizer tower.

7. A catalytic reforming energy-saving method is characterized by comprising the following steps:

and exchanging heat for the bottom liquid generated by the high-pressure absorption tank by using the bottom oil generated by the reformed oil stabilizing tower as a heat source so as to enable the temperature of the bottom liquid generated by the high-pressure absorption tank to be increased and then enter the reformed oil stabilizing tower.

8. The catalytic reforming energy-saving method according to claim 7, further comprising exchanging heat of the bottom liquid produced by the high-pressure absorption tank with a pre-fractionation product produced at the top of a pre-fractionation tower in a pretreatment unit of a catalytic reforming reaction system as a heat source before the bottom liquid produced by the high-pressure absorption tank enters the reformate stabilizing tower.

9. The catalytic reforming energy-saving method according to claim 7, further comprising exchanging heat of the bottom liquid produced by the high-pressure absorption tank with a reformate produced by a reforming reaction unit of a catalytic reforming reaction system as a heat source before the bottom liquid produced by the high-pressure absorption tank enters the reformate stabilizing tower.

10. A catalytic reforming reaction system comprising a catalytic reforming economizer system as claimed in any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of catalytic reforming, in particular to a catalytic reforming energy-saving system, an energy-saving method and a catalytic reforming reaction system.

Background

The reforming device used as a naphtha processing unit mainly takes naphtha as a raw material to produce reformed oil rich in aromatic hydrocarbon, which is used as an aromatic hydrocarbon raw material and a gasoline blending component and is rich in hydrogen and a small amount of liquefied gas. Generally, the method mainly comprises three units of raw material pretreatment, reforming reaction and catalyst regeneration. The pretreatment unit comprises three parts of prefractionation, prehydrogenation and steam stripping, naphtha raw materials from a naphtha stabilizing system enter a prefractionation tower for fractionation, oil gas at the top of the tower is 80-100 ℃, one part of the oil gas is condensed and cooled by an air cooler and a water cooler at the top of the tower and is used as reflux at the top of the tower, and the other part of the oil gas is sent to an n-isopentane separation tower; the method comprises the steps of enabling depentanized oil at the bottom of a prefractionating tower to enter a prehydrogenation reactor after being subjected to pressure boosting, heat exchange and heating temperature rise by a prehydrogenation heating furnace, enabling a reaction product to enter a prehydrogenation reaction feed and a bottom liquid phase of a prehydrogenation liquid separation tank for heat exchange, then entering a prehydrogenation product air cooler and a prehydrogenation product water cooler for condensation and cooling, enabling a hydrogen-rich liquid separation tank to realize gas-liquid separation, enabling a hydrogen-rich liquid phase to circulate back to the prehydrogenation reactor, enabling a bottom liquid phase of the tank to exchange heat with the.

The reforming reaction unit mainly comprises a reforming reaction part, a hydrogen purification part, a reforming fractionation part and the like, refined oil from a pretreatment unit is mixed with reforming circulating hydrogen in a certain hydrogen-oil ratio, and then sequentially passes through a reforming feed heat exchanger, a first reforming heating furnace, a first reforming reactor, a second reforming heating furnace, a second reforming reactor, a third reforming heating furnace, a third reforming reactor, a fourth reforming heating furnace and a fourth reforming reactor, then exchanges heat with the refined oil feed to 100-120 ℃, enters a reforming product water cooler after being cooled to 50-70 ℃ by a reforming product air cooler, realizes the separation of hydrogen and crude gasoline by a low-pressure gas-liquid separation tank and a high-pressure absorption tank, hydrogen enters a hydrogen purification system, crude gasoline (25-40 ℃) at the bottom of the high-pressure absorption tank exchanges heat with bottom oil of a reforming product oil stabilization tower, and then enters a reforming product oil stabilization tower to obtain a qualified stabilized gasoline outlet device, the heat required by the bottom of the reformate stabilizing tower is provided by a heating furnace.

The temperature of oil gas at the top of the prefractionation tower of the reforming device is high, the oil gas is condensed and cooled by an air cooler and a water cooler and then is used as tower top reflux and n-isopentane separation tower feeding, and low-temperature heat is not recovered; the reformed product after heat exchange by the reforming feed heat exchanger has abundant low-temperature heat source; the liquid phase cold energy at the bottom of the high-pressure absorption tank is not fully utilized, and directly exchanges heat with the reformed oil stabilizing tower bottom oil, the heat exchange temperature difference is large, and the feeding temperature of the reformed oil stabilizing tower is lower.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a catalytic reforming energy-saving system, a catalytic reforming energy-saving method and a catalytic reforming reaction system.

The invention is realized by the following steps:

in a first aspect, an embodiment provides a catalytic reforming energy-saving system, which includes a high-pressure absorption tank, a reformate stabilizer and a first heat exchanger.

The high-pressure absorption tank is communicated with a bottom liquid output pipe, the reformed product oil stabilizing tower is communicated with a bottom oil output pipe, the bottom oil output pipe is used as a heat source pipeline to be communicated with a heat flow channel of the first heat exchanger, the bottom liquid output pipe is used as a cold source pipeline to be communicated with a cold flow channel of the first heat exchanger, and the bottom liquid output pipe is communicated with a feed inlet of the reformed product oil stabilizing tower and is used for conveying bottom liquid to the reformed product oil stabilizing tower.

In an optional embodiment, the catalytic reforming energy-saving system further comprises a second heat exchanger and a pre-fractionation discharge pipe communicated with the top of a pre-fractionation tower in a pretreatment unit of the catalytic reforming reaction system, the pre-fractionation discharge pipe is used as a heat source pipeline and communicated with a heat flow channel of the second heat exchanger, and a bottom liquid output pipe is used as a cold source pipeline and communicated with a cold flow channel of the second heat exchanger.

In an alternative embodiment the second heat exchanger is located upstream of the first heat exchanger.

In an optional embodiment, the catalytic reforming energy-saving system further includes a second heat exchanger and a reformate output pipe communicated with a reforming reaction unit of the catalytic reforming reaction system, the reformate output pipe is used as a heat source pipeline to be communicated with a heat flow channel of the second heat exchanger, and the base liquid output pipe is used as a cold source pipeline to be communicated with a cold flow channel of the second heat exchanger.

In an optional embodiment, the catalytic reforming energy-saving system further comprises a reforming feed heat exchanger and a reforming raw material inlet pipe communicated with the reforming pretreatment unit, the reforming raw material inlet pipe is used as a cold source pipeline and communicated with a cold flow channel of the reforming feed heat exchanger, the reformate output pipe is used as a heat source pipeline and communicated with a hot flow channel of the reforming feed heat exchanger, and the reforming feed heat exchanger is arranged at the upstream of the second heat exchanger.

In an optional embodiment, the catalytic reforming energy-saving system further comprises a heating furnace at the bottom of the stabilization tower, the reformate stabilization tower is further communicated with a bottom oil return pipe, one end of the bottom oil return pipe is connected with the bottom of the reformate stabilization tower, the other end of the bottom oil return pipe is connected with the lower part of the reformate stabilization tower, and the middle part of the bottom oil return pipe is connected with the heating furnace at the bottom of the stabilization tower.

In a second aspect, an embodiment provides a catalytic reforming energy-saving method, including:

and (3) exchanging heat for the bottom liquid generated by the high-pressure absorption tank by using the bottom oil generated by the reformed oil stabilizing tower as a heat source so as to enable the temperature of the bottom liquid generated by the high-pressure absorption tank to be increased and then enter the reformed oil stabilizing tower.

In an alternative embodiment, before the bottom liquid produced by the high-pressure absorption tank enters the reformate stabilizing tower, the method further comprises the step of exchanging heat for the bottom liquid produced by the high-pressure absorption tank by using a pre-fractionation product produced at the top of a pre-fractionation tower in a pretreatment unit of the catalytic reforming reaction system as a heat source.

In an alternative embodiment, before the bottom liquid produced by the high-pressure absorption tank enters the reformate stabilizing tower, the method further comprises the step of exchanging heat for the bottom liquid produced by the high-pressure absorption tank by using a reformate produced by a reforming reaction unit of the catalytic reforming reaction system as a heat source.

In a third aspect, embodiments provide a catalytic reforming reaction system, including the catalytic reforming energy-saving system.

The invention has the following beneficial effects:

according to the catalytic reforming energy-saving system obtained through the design, due to the specific arrangement of the bottom liquid output pipe, the bottom oil output pipe and the first heat exchanger, the heat exchange between the bottom oil and the bottom liquid can be realized, the temperature of the bottom liquid entering the reformed oil stabilizing tower is increased, the energy supply of the reformed oil stabilizing tower is reduced, the temperature of the bottom oil entering the arene removing device is reduced, and the cooling load of the arene removing device is reduced.

According to the catalytic reforming energy-saving method obtained through the design, the bottom oil generated by the reformed oil stabilizing tower is used as a heat source to exchange heat with the bottom liquid generated by the high-pressure absorption tank. The temperature of the bottom liquid entering the reformed oil stabilizing tower is increased, the energy supply of the reformed oil stabilizing tower is reduced, the temperature of the bottom oil entering the aromatics removal device is reduced, and the cooling load of the aromatics removal device is reduced.

The catalytic reforming energy-saving system comprises the catalytic reforming energy-saving system, so that the reaction system has smaller load and lower energy consumption compared with the conventional catalytic reforming reaction system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a process flow diagram of a catalytic reforming energy-saving system provided in example 1 of the present invention;

fig. 2 is a process flow diagram of the catalytic reforming energy-saving system provided in embodiment 2 of the present invention.

Icon: 100 a-catalytic reforming energy-saving system; 100 b-catalytic reforming energy-saving system; 110-a high pressure absorption tank; 111-a base liquid output pipe; 120-a first heat exchanger; 130 a-a second heat exchanger; 130 b-a second heat exchanger; 140-reformate stabilizer column; 141-bottom oil output pipe; 151-pre-fractionation discharge pipe; 2-a prefractionator; 160-stable tower bottom heating furnace; 162-bottom oil return line; 170-reformate outlet pipe; 180-reforming feed heat exchanger; 191-reforming raw material inlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following describes the catalytic reforming energy-saving system, method and catalytic reforming reaction system provided by the embodiment of the present invention.

According to the general characteristics of the catalytic reforming reaction system comprising a pretreatment unit and a reforming reaction unit at present, in order to reduce the cooling load of an air cooler at the top of a prefractionation tower or an air cooler of a reformate, the cold energy of the bottom liquid phase of a high-pressure absorption tank is utilized to exchange heat with low-temperature oil gas, the feeding temperature of a reforming oil production stabilizing tower is increased, and the temperature of stable gasoline entering a downstream device is controlled by adjusting the temperature after the bottom liquid phase of the high-pressure absorption tank exchanges heat with the low-temperature oil gas, so that the air cooling load and the load of a heating furnace of.