CN210159230U

CN210159230U - Distillation column reboiler steam liquefaction device is used in production of environmental protection solvent

Info

Publication number: CN210159230U
Application number: CN201920803626.4U
Authority: CN
Inventors: 苗广发; 王兵杰
Original assignee: Dongying Junyuan Petroleum Technology Development Co Ltd
Current assignee: Dongying Junyuan Petroleum Technology Development Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-03-20
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses an environmental protection solvent production is with rectifying column reboiler steam liquefaction device, including tower body, inlet tube, relief valve, integration manometer, integration thermometer, manhole door, steam inlet, integration level gauge, delivery port and drain. The device is internally provided with a liquid phase distributor, a first filler, a first fence, a second filler, a second fence, a spiral nozzle, a steam inlet main pipe and a steam inlet branch pipe from top to bottom respectively. The first filler is arranged on the first fence, and the second filler is arranged on the second fence. The steam inlet is connected with the steam inlet main pipe, each steam inlet branch pipe is connected with the steam inlet main pipe, the central line of each steam inlet branch pipe and the central line of the steam inlet main pipe are in the same horizontal plane, and the spiral nozzles are arranged at the tops of the steam inlet main pipe and each steam inlet branch pipe. The steam liquefying device has the advantages of reasonable design, low manufacturing cost, small occupied area, high automation degree, accurate and reliable operation, heat exchange efficiency of 100 percent, realization of efficient liquefying recovery of steam and reduction of the cost of desalted water.

Description

Distillation column reboiler steam liquefaction device is used in production of environmental protection solvent

Technical Field

The utility model relates to a steam liquefaction device, concretely relates to distillation column reboiler steam liquefaction device is used in production of environmental protection solvent.

Background

Refined alkane products such as propane, butane, pentane, hexane, heptane and the like have the advantages of low emission, small smell, no residue and the like and are suitable for the development trend of environment-friendly solvents, are widely applied to the aspects of refrigerants, foaming agents, plant extraction solvents, glue making, leather making, medical supplies and the like in recent years, and are mainly prepared by the steps of hydrodesulfurization, denitrification, deoxidation, dechlorination, dearomatization and cutting through a rectifying tower on naphtha raw materials. In the rectification process, a steam liquefaction device is needed to liquefy and recycle the steam of each rectifying tower reboiler.

Chemical enterprises mainly adopt shell-and-tube steam liquefaction recovery unit to carry out recycle to rectifying column reboiler steam in environmental protection solvent production process, and shell-and-tube steam liquefaction unit has following problem in the application: firstly, the shell-and-tube steam liquefaction device has lower heat exchange efficiency and high energy consumption. The shell-and-tube steam liquefaction device transfers heat through the heat exchange tubes, and due to certain thermal resistance, large head loss is easily caused by a plurality of heat exchange tubes, a plurality of baffle plates and a plurality of tube passes, the system has high operation pressure, high energy consumption and low heat exchange efficiency; secondly, the shell-and-tube steam liquefaction device has high cost and large floor area. In order to expect the heat exchange effect, the shell-and-tube steam liquefaction device is generally provided with a plurality of heat exchange tubes, a plurality of baffle plates and a plurality of tube passes, and the structure is very complicated, so that the device is expensive in manufacturing cost, large in size and large in occupied area; and secondly, the equipment has high operation and maintenance cost, large potential safety hazard and short service life. The pipe wall at the cold source side of the steam liquefaction device is easy to scale due to water quality, scale inhibitor needs to be added into the cold source periodically and rubber balls are thrown for cleaning, the time consumption is long, and the maintenance workload is large; when high-pressure cleaning is carried out, a high-pressure water gun is required to operate, a water pipe is easy to puncture, so that the steam recovery device is corroded and leaked, the potential safety hazard is large, and the service life of the device is easy to seriously influenced; finally, the traditional recovery device is not provided with an automatic sensing and operating device, cannot be operated automatically and has low control precision. Traditional shell and tube type steam liquefaction device can not insert DCS remote control system owing to do not design teletransmission temperature, pressure instrument and solenoid valve, needs the manual work to carry out field operation, and degree of automation is low, and the hand labor volume is big.

At the present stage, a plurality of enterprises also adopt the hybrid steam liquefaction recovery device to carry out steam liquefaction, and most hybrid steam liquefaction devices have the following problems in application: first, the efficiency of the steam liquefaction is low. In the existing stage, the mixed steam liquefaction device generally carries out steam liquefaction in a common water spraying mode, the particle size of water drops is large, the natural falling speed is high, the contact area of steam and water is small, the contact time is short, and the recovery efficiency of steam liquefaction is low; and secondly, the operation condition of the steam liquefying device is unstable. Because the steam and the water are in free contact in a large space, a thermal field in the device is unstable, and the fluctuation of the operation working condition is easy to occur; finally, the device has low automation design level and cannot realize the online automation operation. At present, most running devices are not provided with online detection devices for temperature, pressure and the like, or the detection devices are low in precision, cannot accurately transmit working condition real-time change parameters, cannot meet the requirements of a DCS (distributed control system) operation system, cannot perform remote automatic operation and increase potential safety hazards of operation.

In view of the above, there is a need to develop a vapor liquefaction apparatus: the method has the advantages that the steam of the reboiler of the environment-friendly solvent rectifying tower is liquefied and recovered, and the DCS automatic monitoring operation of the pressure, temperature and liquid level operation condition in the device is realized, so that the high-efficiency liquefaction and recovery of the steam are realized, the energy consumption of the device and the labor intensity of workers are reduced, and the operation economy of the system is improved.

Disclosure of Invention

The utility model aims at providing a defect to prior art exists, provide a rational in infrastructure, can realize the automatic control operation of device internal pressure, temperature, liquid level operation operating mode DCS, can realize that the high-efficient liquefaction of steam is retrieved, reduce device energy consumption and staff intensity of labour, improve the environmental protection rectifying column reboiler steam liquefaction device for solvent production of system operation economic nature.

The technical scheme of the utility model is that: a distillation column reboiler steam liquefaction device for producing an environment-friendly solvent comprises a tower body, wherein the lower part of the tower body is provided with a water outlet and an integrated liquid level meter for measuring the liquefied water quantity of the device, the top of the tower body is provided with an integrated thermometer and an integrated pressure gauge which are connected with the inside of the tower body, the bottom of the tower body is provided with a drain outlet, a liquid phase distributor, a first filler, a second filler and a steam inlet pipe are respectively arranged in the tower body from top to bottom, the liquid phase distributor is connected with a water inlet pipe through a cold source inlet, the water inlet pipe is provided with an electromagnetic valve, and the filling density of the first filler is greater than that of the second; the central line of an upper measuring inlet of the integrated liquid level meter and the central line of the steam inlet main pipe are on the same straight line, and the central line of a lower measuring inlet of the integrated liquid level meter is higher than the water outlet;

the integrated liquid level meter, the integrated thermometer, the integrated pressure gauge and the electromagnetic valve are respectively and electrically connected with the DCS;

the steam inlet pipe comprises a steam inlet main pipe and a plurality of steam inlet branch pipes, the steam inlet main pipe enters the interior of the tower body through a steam inlet, the steam inlet branch pipes are arranged on the steam inlet main pipe in parallel, the central line of each steam inlet branch pipe is perpendicular to the central line of the steam inlet main pipe and is arranged on the same horizontal plane, spiral nozzles are arranged on the steam inlet main pipe and the steam inlet branch pipes respectively, and outlets of the spiral nozzles correspond to the direction of the second packing.

Preferably, be equipped with first fence and second fence respectively from top to bottom on the tower body inner wall, first filler sets up on first fence, the second filler sets up on the second fence.

Preferably, a safety valve is further arranged at the top of the tower body.

Preferably, a manhole door is arranged at the upper part of the tower body.

Preferably, the first packing and the second packing are stainless steel structured packing, and the stainless steel structured packing is stainless steel corrugated wire mesh packing.

Preferably, the liquid phase distributor is a trough liquid phase distributor.

Compared with the prior art, the utility model, have following advantage: the structure is reasonable, the heat exchange efficiency is high, and the heat exchange efficiency can reach 100% through the uniform injection of the injection angle of the spiral nozzle to steam and the cutting and mixing action of the multilayer filler for efficient heat exchange to steam and water; the device has low energy consumption, and because the internal packing structure of the device is reasonable and the operating pressure is small, the head loss is small, the power required by cold and heat sources is small, and the energy consumption is low; the device has low manufacturing cost and small occupied area, adopts the packing matching structures with different densities to carry out high-efficiency steam-water mass and heat transfer, effectively reduces the volume of the device and reduces the manufacturing cost; the device has low maintenance cost, and because the filler used for mass and heat transfer of the device is open, the pressure and the temperature in the device are constant, the scaling phenomenon is almost zero, and the maintenance cost of the device is effectively reduced; the device can realize automatic operation, and the liquid level, the temperature, the pressure, the flow and other electronic devices and the automatic control equipment are connected into the DCS system, so that the online monitoring and automatic remote accurate control of the liquid level, the temperature and the pressure of the liquefaction recovery device are realized.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view showing a structure of a connection between a steam inlet main pipe and a steam inlet branch pipe;

FIG. 3 is a bottom view of FIG. 2;

in the figure: 1. a water outlet; 2. a tower body; 3. a steam inlet; 301. a steam inlet main pipe; 302. an inlet manifold; 4. a second fence; 5. a second filler; 6. a first fence; 7. a first filler; 8. a liquid phase distributor; 9. a manhole door; 10. an integrated thermometer; 11. an integrated pressure gauge; 12. a water inlet pipe; 13. a safety valve; 14. a spiral nozzle; 15. an integrated liquid level meter; 16. a sewage draining outlet; 17. an electromagnetic valve.

Detailed Description

Referring to fig. 1-3, a distillation column reboiler steam liquefaction device for production of an environment-friendly solvent comprises a column body 2, an integrated liquid level meter 15, an integrated thermometer 10, an integrated pressure gauge 11, a liquid phase distributor 8, a first filler 7, a second filler 5 and a steam inlet pipe. The steam inlet pipe comprises a steam inlet main pipe 301 and a steam inlet branch pipe 302. The top of the tower body 2 is provided with an integrated thermometer 10, an integrated pressure gauge 11, a safety valve 13 and a water inlet pipe 12, wherein the safety valve 13 is used for maintaining the set working pressure in the device, discharging steam at overpressure, and closing after the pressure is recovered.

The upper part of the tower body 2 is provided with a manhole door 9, the lower part of the tower body 2 is provided with a steam inlet 3, an integrated liquid level meter 15 and a water outlet 1, and the bottom of the tower body 2 is provided with a sewage outlet 16. A liquid phase distributor 8, a first filler 7, a first fence 6, a second filler 5, a second fence 4, a spiral nozzle 14, a steam inlet main pipe 301 and a steam inlet branch pipe 302 are respectively arranged in the tower body from top to bottom. The first packing 7 is disposed on the first fence 6 and the second packing 4 is disposed on the second fence 5. The liquid phase distributor 8 is connected with a water inlet pipe 12 through a cold source inlet, the water inlet pipe 12 is provided with an electromagnetic valve 17, and the filling density of the first filler 7 is greater than that of the second filler 5; the central line of an upper measuring inlet of the integrated liquid level meter 15 and the central line of the steam inlet main pipe 301 are on the same straight line, and the central line of a lower measuring inlet of the integrated liquid level meter 15 is higher than a water outlet; the steam inlet 3 is connected with a steam inlet main pipe 301, each steam inlet branch pipe 302 is connected with the steam inlet main pipe 301, the central line of each steam inlet branch pipe 302 is perpendicular to the central line of the steam inlet main pipe 301 and is on the same horizontal plane, each steam inlet branch pipe 302 is bilaterally symmetrical along the central line of the steam inlet main pipe 301, steam can be uniformly dispersed into the tower body 2 by arranging a plurality of rows of steam inlet branch pipes 302, the spiral nozzles 14 are arranged at the tops of the steam inlet main pipe 301 and each steam inlet branch pipe 302, namely, the outlets of the spiral nozzles 14 correspond to the direction of the second packing 4. The integrated liquid level meter 15, the integrated thermometer 10, the integrated pressure gauge 11 and the electromagnetic valve 17 are respectively and electrically connected with the DCS system.

The utility model discloses process flow:

steam enters the steam inlet main pipe 301 and each steam inlet branch pipe 302 through the steam inlet 3 and enters the steam liquefying device through the spiral nozzle 14, the entering steam has larger radial component velocity due to the conical structure of the spiral nozzle 14 and is filled in the device, and disturbance of steam and cooling water in the device can be increased due to different angle directions of gas sprayed by the spiral nozzle 14, and the steam-water mass and heat transfer efficiency in the device is improved. The steam is in primary heat exchange with the droplets falling from the first grid 4 above the spiral nozzle 14. Then the steam continuously and sequentially passes through the second grating 4, the second filler 5, the first grating 6 and the first filler 7 upwards to be mixed with cooling water for further mass and heat transfer, bead-shaped condensation is formed on the first filler 7 and the second filler 5, and stable liquid flow is formed under the action of gravity to the bottom in the device for storage.

Cooling water enters the device through a cold source inlet 12 and is uniformly distributed on the surface layer of the first filler 7 through a liquid phase distributor 8. The cooling water is mixed, cooled and condensed with the steam by the first filler 7 and the second filler 5 in sequence, and then drops to the bottom in the device together with the steam liquefied water for storage, and is pumped out to the subsequent process through the water outlet 1.

During specific work, come temperature and pressure in the measuring device through integration thermometer 10 and integration manometer 11, with data teletransmission to well accuse room DCS system to according to the pressure at device top and the aperture of the solenoid valve 17 of temperature regulation inlet tube 12, thereby control the cooling water yield of access to plant, guarantee that steam can all liquefaction water and recycle, prevent simultaneously that the interior vacuum of device from crossing excessively to lead to the water after the liquefaction to vaporize again.

The first packing 7 and the second packing 5 adopt stainless steel structured packing or other metal structured packing, preferably stainless steel corrugated wire mesh packing, so that liquefied water pollution caused by corrosion of the packing by dissolved oxygen in steam and water is prevented, meanwhile, the temperature difference of a thermal field in the packing is reduced by utilizing the good heat conductivity of metal, and the recovery efficiency of steam is improved. Because the steam-water ratio of the upper part in the device is small, and the filling density of the first filler 7 is greater than that of the second filler 5, the steam-water mass and heat transfer times in the first filler 7 can be increased, and the steam liquefaction rate is improved.

The spiral nozzle 14 is preferably made of a hollow stainless steel structure, and the spraying angle is preferably 120-160 degrees, so that the uniform distribution of steam in the device is ensured, the radial speed is sufficient, and the disturbance of the fluid in the device is improved.

The integrated liquid level meter 15 is used for measuring the liquid level of the liquefied water quantity of the device, remotely transmitting data to a DCS (distributed control system) of a central control room, and meanwhile adjusting the output condition of the water pump behind the water outlet 1 in real time according to the liquid level condition to prevent the liquid level from being too high or emptying the pump.

The cooling water in the water inlet pipe 12 is demineralized water meeting the normal production conditions of the boiler.

The liquid phase distributor 8 is preferably a trough distributor to increase the amount of cooling water entering the apparatus while reducing atomization and splashing of the cooling water.

The water outlet 1 is provided with a horn mouth in the device, thereby increasing the diversion effect on liquid and reducing the head loss of the pipeline.

The drain outlet 16 is arranged at the bottom of the device and is used for discharging sewage and mechanical impurities at the bottom of the device and simultaneously discharging liquid in the device when in maintenance.

The manhole door 9 is used for personnel to overhaul after the device stops.

The device has low energy consumption, and because the internal packing structure of the device is reasonable and the operating pressure is small, the head loss is small, the power required by cold and heat sources is small, and the energy consumption is low; the device has low manufacturing cost and small occupied area, adopts the packing matching structures with different densities to carry out high-efficiency steam-water mass and heat transfer, effectively reduces the volume of the device and reduces the manufacturing cost; the device has low maintenance cost, and because the filler used for mass and heat transfer of the device is open, the pressure and the temperature in the device are constant, the scaling phenomenon is almost zero, and the maintenance cost of the device is effectively reduced; the device can realize automatic operation, and the liquid level, the temperature, the pressure, the flow and other electronic devices and the automatic control equipment are connected into the DCS system, so that the online monitoring and automatic remote accurate control of the liquid level, the temperature and the pressure of the liquefaction recovery device are realized.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. The utility model provides an environmental protection solvent production is with rectifying column reboiler steam liquefaction device which characterized in that: the device comprises a tower body, wherein the lower part of the tower body is provided with a water outlet and an integrated liquid level meter for measuring the liquefied water quantity of the device, the top of the tower body is provided with an integrated thermometer and an integrated pressure gauge which are connected with the inside of the tower body, the bottom of the tower body is provided with a sewage outlet, a liquid phase distributor, a first filler, a second filler and a steam inlet pipe are respectively arranged in the tower body from top to bottom, the liquid phase distributor is connected with a water inlet pipe through a cold source inlet, the water inlet pipe is provided with an electromagnetic valve, and the filling density of the first filler is greater than that; the central line of an upper measuring inlet of the integrated liquid level meter and the central line of the steam inlet main pipe are on the same straight line, and the central line of a lower measuring inlet of the integrated liquid level meter is higher than the water outlet;

2. The distillation tower reboiler steam liquefaction device for producing the environment-friendly solvent as claimed in claim 1, wherein: the tower body is characterized in that a first fence and a second fence are arranged on the inner wall of the tower body from top to bottom respectively, the first filler is arranged on the first fence, and the second filler is arranged on the second fence.

3. The distillation tower reboiler steam liquefaction device for producing environment-friendly solvent according to claim 2, characterized in that: and the top of the tower body is also provided with a safety valve.

4. The distillation tower reboiler steam liquefaction device for producing the environment-friendly solvent as claimed in claim 1, wherein: and a manhole door is arranged at the upper part of the tower body.

5. The distillation tower reboiler steam liquefaction device for environment-friendly solvent production according to claim 1 or 2, characterized in that: the first packing and the second packing are stainless steel structured packing, and the stainless steel structured packing is stainless steel corrugated wire mesh packing.

6. The distillation tower reboiler steam liquefaction device for producing the environment-friendly solvent as claimed in claim 1, wherein: the liquid phase distributor is a groove type liquid phase distributor.