CN214693738U - MTO purifies sewage purification system - Google Patents

Abstract

The application discloses MTO purifies sewage purification system, including purifying water heat exchanger and sewage stripping tower, the one end of purifying water heat exchanger is connected with the buffer tube through the tee bend pipeline, the one end of purifying water heat exchanger still is connected with the boiling bed through the tee bend pipeline, there is concentrated water backward flow jar at sewage stripping tower's top through advancing water piping connection, the one end of buffer tube is connected on the inlet tube, install the sampling cabinet on the inlet tube, the sampling cabinet is located between sewage stripping tower and the buffer tube, be equipped with the reserve pipeline on the inlet tube, the reserve pipeline spans the junction of buffer tube and inlet tube. The utility model discloses a to MTO clean system's improvement, stabilized the concentration in the sewage stripping tower, can effectual reduction scale deposit phenomenon, improve system operation cycle, can improve the treatment effeciency and the qualification rate of quality of water under stable concentration environment again, guarantee to purify waste water COD and can also carry out the reutilization to the backward flow water in the concentrated water backward flow jar in the index range, reduce the waste water volume of backward flow.

Description

MTO purifies sewage purification system

Technical Field

The utility model relates to the technical field of machinery, especially, relate to a MTO purifies sewage purification system.

Background

Methanol To Olefin (MTO) refers to a chemical technology for producing low-carbon olefins by taking methanol synthesized by coal or natural gas as a raw material and by means of a fluidized bed reaction form similar to a catalytic cracking device, and an MTO process for preparing ethylene and propylene from methanol is an important chemical technology at present; the technology takes methanol synthesized by coal or natural gas as a raw material to produce low-carbon olefin, and is a core technology for developing non-petroleum resources to produce products such as ethylene, propylene and the like.

When the MTO water purifying device normally operates, part of concentrated water is used as top reflux of the sewage stripping tower. The concentrated water contains a large amount of aldehydes and ketones, wherein the acetone content is more than 30 percent, the butanone is more than 20 percent, and part of acetaldehyde and propionaldehyde are contained. When the contents of acetaldehyde, ethanone, propionaldehyde and acetone are high, aldol condensation reaction is carried out under the alkaline condition to form high molecular weight compounds, and the compounds are yellow or tawny. When the generated macromolecular substances pass through the tower top reflux pump, part of substances block a filter screen of the tower top reflux pump, so that the filter screen of the pump needs to be cleaned frequently; the other part of the substances enter the sewage stripping tower along with the backflow and are attached to the surface of the tower tray to block the tower tray, so that the gas phase resistance is increased, the backflow water quantity cannot smoothly flow downwards and is accumulated on the tower tray, the pressure difference of the sewage stripping tower is finally increased, the COD (chemical oxygen demand) of the purified water is ultrahigh, the long-period operation of the sewage stripping tower is seriously influenced, the device cannot avoid the problem that the sewage stripping tower stops and is rush-repaired due to accidents or production bottlenecks, and therefore, an MTO (methanol to olefin) purified sewage purification system is provided to solve the problems.

SUMMERY OF THE UTILITY MODEL

The application provides a sewage purification system is purified to MTO has solved traditional MTO water purification processing system sewage and has easily blockked up the problem that influences the normal operating of system.

The application provides an MTO purifies sewage purification system, including purifying water heat exchanger and sewage strip tower, the one end of purifying water heat exchanger is connected with the buffer tube through the tee bend pipeline, the one end of purifying water heat exchanger still is connected with the boiling bed through the tee bend pipeline, there is the concentrated water backward flow jar at the top of sewage strip tower through advancing water piping connection, the one end of buffer tube is connected on the inlet tube, install the sampling cabinet on the inlet tube, the sampling cabinet is located the sewage strip tower with between the buffer tube, be equipped with reserve pipeline on the inlet tube, reserve pipeline spanes the buffer tube with the junction of inlet tube.

Preferably, a booster pump is mounted on the water inlet pipe, the booster pump is positioned between the connection point of the buffer pipe and the sewage stripping tower, and the spare pipe spans across the booster pump.

Preferably, both ends of the buffer tube are provided with a flow guide valve.

Preferably, the buffer tube is coated with insulating cotton.

Preferably, the wall of the buffer tube and the wall of the water inlet tube are 5 MM.

According to the technical scheme, the application provides an MTO purification sewage system, during operation, according to different sewage concentrations discharged during production, when the concentrations of aldehydes and ketones in a sewage stripping tower are too high, scaling of a reflux pump and a tower tray of the sewage stripping tower increases pressure difference, at the moment, water in a concentrated water reflux tank enters the top of the sewage stripping tower through a water inlet pipe and is mixed with treated sewage, the sewage in the concentrated water reflux tank is purified again, the concentrations of the aldehydes and ketones are reduced, because the concentrations in the concentrated water reflux tank are not fixed, when the concentration in the concentrated water reflux tank is too high, the concentration of the sewage at the top of the sewage stripping tower cannot be reduced, partial water in a purified water heat exchanger enters a buffer pipe through the buffer pipe to reduce the concentration of the liquid flowing out of the concentrated water reflux tank, so that the sewage concentration at the top of the sewage stripping tower is reduced, can reduce in the sewage strip tower aldehyde, ketone material takes place condensation reaction, alleviate the filter screen and the tower tray jam of top of the tower backwash pump, extension sewage strip tower operation cycle, thereby guarantee the long period operation of sewage strip tower, the check out test set control inlet tube concentration of the relevant piece of operation stage accessible sampling cabinet installation, it is normal to guarantee system concentration, because the liquid flow in the inlet tube is less, easily take place the scale deposit phenomenon, when needing to overhaul the inlet tube, can open reserve pipeline and overhaul.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through the cooperation of the concentrated water reflux tank and the purified water heat exchanger, the concentration of the top of the sewage stripping tower is reduced by utilizing the water treated in the purified water heat exchanger, the scale formation of the system can be reduced, the long-time operation of the system is ensured, the treated water in the concentrated water reflux tank can be secondarily utilized, the treatment capacity of the system is improved, and the water quality qualification rate is improved due to the improvement of the stability of the water quality concentration in the system;

2. the problem that the sewage in the concentration water backflow tank is easy to cause scale deposition is solved by arranging the standby pipeline, and the pipeline is cleaned regularly to ensure the normal operation of the pipeline;

to sum up, the utility model discloses a to MTO clean system's improvement, stabilized the concentration in the sewage stripping tower, can effectual reduction scale deposit phenomenon, improve system operation cycle, can improve the treatment effeciency and the qualification rate of quality of water under stable concentration environment again, guarantee to purify waste water COD and in the index range, can also carry out reutilization, reduce the waste water volume of backward flow to the backward flow water in the concentrated water backward flow jar.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a schematic structural view of an MTO sewage purification system according to the present invention;

in the figure: 1 sewage stripping tower, 2 water inlet pipes, 3 pressure pumps, 4 spare pipelines, 5 boiling beds, 6 concentrated water reflux tanks, 7 guide shower valves, 8 purified water heat exchangers, 9 buffer pipes and 10 sampling cabinets.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, an MTO purified sewage purification system comprises a purified water heat exchanger 8 and a sewage stripping tower 1, wherein the sewage stripping tower 1 is a main device in the system and is used for water treatment, one end of the purified water heat exchanger 8 is connected with a buffer tube 9 through a three-way pipeline to change the flow direction of a water body in the system, the purified water heat exchanger 8 stabilizes the water temperature to a proper temperature and then conveys the water temperature, the working temperature in the system is stabilized, one end of the purified water heat exchanger 8 is also connected with a boiling bed 5 through a three-way pipeline to perform secondary treatment on the purified water, the top of the sewage stripping tower 1 is connected with a concentrated water reflux tank 6 through a water inlet pipe 2, the water with lower concentration refluxed in the concentrated water reflux tank 6 is conveyed to the sewage stripping tower 1 to be treated again, the concentration in the sewage stripping tower 1 is reduced, and part of the sewage with lower concentration is subjected to secondary recovery, reduce the amount of waste water, the cladding has the heat preservation cotton on buffer tube 9, reduce the influence of external temperature to buffer tube 9 liquid, the both ends of buffer tube 9 all are equipped with guide shower valve 7, when overhauing, the evacuation pipeline of being convenient for, avoid causing the pollution to the environment, the one end of buffer tube 9 is connected on inlet tube 2, when concentrate water backward flow jar 6 water is not enough to fall sewage strip tower 1 to suitable value, let comparatively clean water into inlet tube 2, control the concentration in sewage strip tower 1, install sampling cabinet 10 on inlet tube 2, can install relevant apparatus and monitor or adopt the monitoring, sampling cabinet 10 is located between sewage strip tower 1 and buffer tube 9, monitor the water concentration after the mixture, be equipped with reserve pipe 4 on inlet tube 2, reserve pipe 4 crosses the junction of buffer tube 9 and inlet tube 2, because the velocity of flow of inlet tube 2 is slower, the water that concentrate backward flow jar 6 flows out easily produces the sediment, need regularly open reserve pipeline 4 and clear up inlet tube 2, guarantee system normal operating, the pipe wall in buffer tube 9 and the inlet tube 2 is 5MM, is convenient for overhaul, is difficult for causing the damage.

The utility model discloses in, install force (forcing) pump 3 on inlet tube 2, less when pressure, the flow is not enough, pressurizes through force (forcing) pump 3, and force (forcing) pump 3 is located between buffer tube 9's tie point and sewage strip tower 1, pressurizes the water after mixing, ensures that reduction sewage strip tower 1 that can be normal interior sewage concentration, and reserve pipeline 4 spanes force (forcing) pump 3, easy access force (forcing) pump 3.

According to the technical scheme, when in use, control valves are arranged at water inlets and water outlets among pipelines of a system, the control valves are convenient to overhaul and maintain and are not elaborated on in common knowledge, when in use, according to different concentrations of sewage discharged in production, when the concentrations of aldehydes and ketones of the sewage stripping tower 1 are too high, a reflux pump and a tower tray of the sewage stripping tower 1 are scaled to increase pressure difference, at the moment, water in a concentrated water reflux tank 6 enters the top of the sewage stripping tower 1 through a water inlet pipe 2 and is mixed with treated sewage, the sewage in the concentrated water reflux tank 6 is purified again, the concentrations of the aldehydes and ketones are reduced, because the concentration in the concentrated water reflux tank 6 is not fixed, when the concentration of the concentrated water reflux tank 6 is too high and cannot be reduced, part of water in a purified water heat exchanger 8 enters the water inlet pipe 2 through a buffer pipe 9 to reduce the concentration of liquid flowing out of the concentrated water reflux tank 6, thereby reduce the sewage concentration at 1 top of the tower of sewage strip tower, can reduce aldehyde in the sewage strip tower, the condensation reaction takes place for the ketone material, filter screen and the tower tray of alleviating the top of the tower backwash pump block up, extension sewage strip tower operating cycle, thereby guarantee sewage strip tower long period operation, the check out test set of the relevant piece of operation stage accessible sampling cabinet 10 installation concentration in inlet tube 2, guarantee that system concentration is normal, because the liquid flow in inlet tube 2 is less, the scale deposit phenomenon easily takes place, when needing to overhaul inlet tube 2, can open reserve pipeline 4 and overhaul.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

Claims (5)

1. The utility model provides a MTO purifies sewage purification system, includes purifying waste water heat exchanger (8) and sewage stripping tower (1), its characterized in that: the one end of purifying water heat exchanger (8) is connected with buffer tube (9) through three-way pipe, the one end of purifying water heat exchanger (8) still is connected with ebullated bed (5) through three-way pipe, the top of sewage strip tower (1) is connected with concentrated water backward flow jar (6) through inlet tube (2), the one end of buffer tube (9) is connected on inlet tube (2), install sampling cabinet (10) on inlet tube (2), sampling cabinet (10) are located sewage strip tower (1) with between buffer tube (9), be equipped with reserve pipeline (4) on inlet tube (2), reserve pipeline (4) span buffer tube (9) with the junction of inlet tube (2).

2. An MTO purification sewage system according to claim 1, wherein a booster pump (3) is installed on the water inlet pipe (2), said booster pump (3) being located between the connection point of the buffer pipe (9) and the sewage stripper (1), said spare pipe (4) crossing said booster pump (3).

3. The MTO purification sewage system according to claim 1, wherein both ends of the buffer tube (9) are provided with a pilot shower valve (7).

4. An MTO purified wastewater purification system according to claim 1, wherein said buffer tube (9) is coated with insulation cotton.

5. An MTO purified wastewater purification system according to claim 1, wherein the wall of the buffer tube (9) and the wall of the inlet tube (2) are 5 MM.

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