CN217041342U

CN217041342U - Device for reducing steam consumption in caprolactam refining process production

Info

Publication number: CN217041342U
Application number: CN202220658386.5U
Authority: CN
Inventors: 张勇; 耿维绪; 付衍胜; 蒋家新
Original assignee: Liaocheng Luxi Polyamide New Material Technology Co ltd
Current assignee: Liaocheng Luxi Polyamide New Material Technology Co ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-07-26
Anticipated expiration: 2032-03-24

Abstract

The utility model discloses a reduce caprolactam refining technology production steam consumption's device, make full use of top of the tower low-grade heat energy, reduced steam and circulating water consumption, the concrete scheme is as follows: the utility model provides a reduce caprolactam refining technology production steam consumption's device, includes the benzene stripping tower, benzene stripping tower right side is connected with the compressor, the compressor right side is connected with the heater, the heater right side is connected with one and imitates the evaporating tower.

Description

Device for reducing steam consumption in caprolactam refining process production

Technical Field

The utility model belongs to the technical field of the energy-conserving technique of new technology and specifically relates to a reduce device that caprolactam refining technology produced steam consumption.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Caprolactam is an important organic chemical raw material, is a monomer for producing nylon-6 fiber (i.e. nylon) and nylon-6 engineering plastics, can be used for producing downstream products such as nylon plastics, fiber, L-lysine and the like, and is an important step for producing caprolactam by using cyclohexanone, hydrogen peroxide and ammonia as raw materials in an ammoximation reaction.

The caprolactam rearrangement reaction is a process for generating caprolactam sulfate by reacting cyclohexanone oxime with oleum, excess sulfuric acid is removed by ammonium sulfate neutralization crystallization, crude caprolactam (70% aqueous solution) is subjected to benzene extraction and ion exchange hydrogenation to remove impurities and is changed into 30% caprolactam aqueous solution, a caprolactam liquid product (99.9%) is obtained by an evaporation and distillation operation unit, the concentration of caprolactam is increased from 70% to 99.9%, partial wastewater is formed in the extraction and evaporation processes and mainly contains benzene and trace light components, the benzene recovery process of the existing wastewater stripping tower and stripping tower is shown in figure 2, the benzene recovery is usually carried out by adding steam into the stripping tower, the temperature at the top of the stripping tower is 98 ℃, the pressure is 2KPa, benzene steam at the top of the stripping tower is usually condensed by circulating water and then is recovered, the wastewater at the bottom of the stripping tower is sent to a water treatment process, under the current energy-saving and emission reduction situation, how to utilize the low-grade heat energy at the top of the tower and reduce the consumption of steam and circulating water has very important significance for reducing the production cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a device for reducing caprolactam refining technology production steam consumption, make full use of top of the tower low-grade heat energy has reduced steam and circulating water consumption to the not enough of prior art existence.

The utility model provides a reduce caprolactam refining technology production steam consumption's device, includes the benzene strip tower, benzene strip tower right side is connected with the compressor, the compressor right side is connected with the heater, the heater right side is connected with one and imitates the evaporating tower.

Further, a condenser is connected to the heater.

Further, the bottom of the benzene stripping tower is connected with a first reboiler.

Further, a condensate stripping tower is arranged on the left side of the benzene stripping tower.

Furthermore, a first steam outlet is formed in the top of the benzene stripping tower, and a second steam outlet is formed in the top of the condensate stripping tower.

Further, the first steam outlet and the second steam outlet are respectively connected with a compressor.

Further, a second reboiler is connected to the bottom of the condensate stripper.

Further, a third reboiler is connected to the bottom of the first-effect evaporation tower.

Further, the compressor is a screw compressor.

Above-mentioned the utility model has the advantages as follows:

1) the utility model discloses a screw rod vapor compressor equipment comes to carry out recycle to stripper tower top low-grade heat energy, and tower top benzene steam no longer through the condenser condensation, but directly pressurizes certain pressure by vapor compressor, and the rethread heater heats appointed temperature, lets in an effect evaporation tower and heats other materials in order to reach the purpose that reduces steam consumption, has reduced the cooling water consumption simultaneously.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic structural diagram of a caprolactam refining process production system according to the exhaust gas pressurization energy-saving technology.

FIG. 2 is a flow diagram of benzene recovery in a prior art wastewater stripper and stripper.

Wherein: 1. the system comprises a condensate stripping tower 2, a second steam outlet 3, a first steam outlet 4, a benzene stripping tower 5, a compressor 6, a condenser 7, a heater 8, a first-effect evaporation tower 9, a third reboiler 10, a first reboiler 11 and a second reboiler.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in the present invention, if appearing, are only used to indicate the correspondence with the directions of up, down, left and right of the drawings themselves, and not to limit the structure, but merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the equipment or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Just as the background art introduces, there is the problem that the cost of expansion drying equipment is high among the prior art, in order to solve above technical problem, the utility model provides a fruit vegetables infrared pressure difference expansion drying equipment.

Example one

The utility model provides a reduce caprolactam refining technology production steam consumption's device, includes benzene stripping tower 4, benzene stripping tower right side is connected with compressor 5, the compressor right side is connected with one and imitates evaporating tower 8, be provided with heater 7 between compressor and one and imitate the evaporating tower.

After benzene-containing wastewater is sent into a benzene stripping tower for benzene recovery, benzene steam at the top of the tower is pressurized to 0.2MPa by a compressor 5, and then the wastewater is heated to 132.4 ℃ by a heater, so that the steam meets the requirements of an effective evaporation tower 8, and then the steam enters the effective evaporation tower 8 for further utilization of the steam; the waste water is heated, the steam consumption of the reboiler is reduced, meanwhile, the benzene steam is not cooled by the cooler any more, and the circulating water is saved.

The heater is connected with a condenser 6; the steam may be condensed by a condenser.

The bottom of the benzene stripping tower is connected with a first reboiler 10, the bottom of the condensate stripping tower is connected with a second reboiler 11, and the bottom of the first-effect evaporation tower is connected with a third reboiler 9. Steam of 0.5MPa is introduced through a reboiler to be used as a heat source for heating.

The benzene stripping tower left side is provided with condensate stripping tower 1, further improves benzene recovery effect.

The device is characterized in that a first steam outlet 3 is formed in the top of the benzene stripping tower, a second steam outlet 2 is formed in the top of the condensate stripping tower, and the first steam outlet and the second steam outlet are respectively connected with a compressor.

The compressor is a screw compressor, the screw compressor has high reliability, few parts and no easily damaged parts, so the screw compressor has reliable operation and long service life, and the overhaul interval can reach 4 to 8 ten thousand hours; the screw compressor has the characteristic of forced gas transmission, the volume flow is hardly influenced by the exhaust pressure, high efficiency can be kept in a wide range, and the screw compressor is suitable for various working conditions under the condition that the structure of the compressor is not changed.

The working principle is as follows: the benzene-containing wastewater is sent into a stripping tower, 0.5MPa steam is used as a heat source for heating, under the process conditions of 101 ℃ of the tower kettle, 8KPa of pressure, 98 ℃ of the tower top and 5KPa of pressure, the benzene steam at the tower top is pressurized to 0.2MPa by a screw compressor, and then the wastewater is heated to 132.4 ℃ by a heater, so that the steam meets the requirements of an effective evaporation tower 8, and then the steam enters the effective evaporation tower 8 for further utilization; the waste water is heated, the steam consumption of the reboiler is reduced, meanwhile, the benzene steam is not cooled by the cooler any more, and the circulating water is saved.

Under the normal operation condition, the steam consumption of the wastewater stripping tower and the benzene stripping tower is about 10t/h, and the circulating water consumption is about 400m ³ The steam can be generated to be 8t/h under 0.20MPa after the exhaust gas pressurization technology is adopted, and the part of steam is used in a single-effect evaporation tower to reduce the steam consumption; circulating water consumption of the condenser of the stripping tower is about 150m ³ The benefits are as follows:

steam is saved each year: 8 × 120 ═ 960 tons

The circulating water cost is saved each year: (400-) 150 ═ 0.2 ═ 50 tons

According to the content, the utility model discloses it is obvious to reduce steam and circulating water consumption, and energy-conserving effect is showing, and this equipment is adjusted according to production load, and continuous strong operability, degree of automation is high, and operating personnel needn't realize unmanned on duty operation through long-time professional training.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a reduce caprolactam refining technology production steam consumption's device, its characterized in that, includes the benzene strip tower, benzene strip tower right side be connected with the compressor, the compressor right side be connected with the heater, the heater right side be connected with one and imitate the evaporation tower.

2. The apparatus as claimed in claim 1, wherein a condenser is connected to the heater.

3. The apparatus for reducing steam consumption in refining caprolactam according to claim 1, wherein the bottom of the benzene stripper is connected with a first reboiler.

4. The device for reducing steam consumption in the refining process of caprolactam according to claim 1, wherein a condensate stripping tower is arranged at the left side of the benzene stripping tower.

5. The device for reducing steam consumption in the refining process of caprolactam according to claim 4, wherein a first steam outlet is arranged at the top of the benzene stripping tower, and a second steam outlet is arranged at the top of the condensate stripping tower.

6. The device for reducing steam consumption in the refining process of caprolactam of claim 5, wherein the top of the condensate stripper is provided with a second steam outlet.

7. The apparatus for reducing steam consumption in caprolactam refining process according to claim 6, wherein the first steam outlet and the second steam outlet are respectively connected with a compressor.

8. An apparatus for reducing steam consumption in refining caprolactam according to claim 4, wherein a second reboiler is connected to the bottom of the condensate stripper.

9. The apparatus of claim 1, wherein a third reboiler is connected to the bottom of the single effect evaporation tower.

10. The apparatus as claimed in claim 1, wherein the compressor is a screw compressor.