CN212800010U - Device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater - Google Patents
Device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater Download PDFInfo
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- CN212800010U CN212800010U CN202021400526.6U CN202021400526U CN212800010U CN 212800010 U CN212800010 U CN 212800010U CN 202021400526 U CN202021400526 U CN 202021400526U CN 212800010 U CN212800010 U CN 212800010U
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Abstract
The utility model discloses a device for reducing COD in MTO quenching wastewater, which comprises a quenching wastewater tank, a filter, an oxide stripping tower feeding and discharging heat exchanger, an oxide stripping tower and a wastewater cooler, wherein the quenching wastewater tank is sequentially connected with the filter, the oxide stripping tower feeding and discharging heat exchanger and the oxide stripping tower through pipelines; and a discharge pipeline at the top of the oxide stripping tower is connected with a torch through a pressure control valve. The utility model discloses a device carries out the strip processing with rapid cooling waste water, can effectively reduce rapid cooling waste water COD, reduces sewage treatment load and discharge water volume, increases the waste water rate of utilization.
Description
Technical Field
The utility model belongs to the technical field of Methanol To Olefin (MTO), concretely relates to device that COD was reduced to MTO rapid cooling waste water.
Background
Methanol To Olefin (MTO) is a process for producing low-carbon olefins (ethylene and propylene) by using methanol as a raw material. The methanol-to-olefin (MTO) device preheats and vaporizes a methanol raw material, enters a reactor after being overheated, and contacts and reacts with an active center of a catalyst in a fluidized bed environment to generate reaction gas taking ethylene and propylene as target products. The catalyst and the reaction gas are separated by a cyclone separator and then return to the reactor, the reaction gas is subjected to heat exchange and cooling, is washed and cooled and then is sent to a product compressor unit for compression, condensation, removal of oxide and purification of olefin products, and finally the reaction gas is subjected to an alkali washing and drying system to remove acid gas and water in the reaction gas.
Wherein, reaction gas which is rich in target products of ethylene and propylene from the reactor enters a quenching tower and is in countercurrent contact with cooling water, and quenching water, oxide stripping tower water and reaction gas cooling water from a separation tower are fed to the bottom of the quenching tower to form quenching wastewater. The treatment of the quenching wastewater in the MTO process is generally carried out by directly discharging the quenched wastewater after the quenched wastewater is cooled by a heat exchanger from a wastewater tank and then sending the cooled quenched wastewater into a sewage treatment device. At present, due to the problems existing in sewage treatment, the high COD quenching wastewater in the MTO device is discharged to the sewage treatment device, which easily causes the standard exceeding of the effluent index of the sewage treatment, and the load reduction of the device is caused by the influence of discharge flow limitation and the like. The COD of the quenching wastewater is high, so that the cost and the environmental protection risk are increased for the later-stage sewage treatment, and the high load and long-period operation of the device are influenced.
Disclosure of Invention
An object of the utility model is to provide a MTO rapid cooling waste water reduces device of COD solves high COD rapid cooling waste water treatment's technical problem, the device can reduce rapid cooling waste water COD, improves the quality of water of outer row's rapid cooling waste water, reduces sewage treatment load, guarantees high load, the long period running of device.
In order to realize the purpose of the invention, the utility model adopts the technical scheme that:
a device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater comprises a quenching wastewater tank, and is characterized by further comprising a filter, an oxide stripping tower feeding and discharging heat exchanger, an oxide stripping tower and a wastewater cooler, wherein the quenching wastewater tank is sequentially connected with the filter, the oxide stripping tower feeding and discharging heat exchanger and the oxide stripping tower through pipelines; and a discharge pipeline at the top of the oxide stripping tower is connected with a torch through a pressure control valve.
Furthermore, the bottom of the oxide stripping tower is provided with a reboiler.
Furthermore, a quenching waste water control valve is arranged on a pipeline of the quenching waste water tank connected with the filter, a remote-transmission liquid level controller is installed on the quenching waste water tank, and the quenching waste water control valve is connected with the liquid level controller in a cascade control mode.
Furthermore, the feeding and discharging heat exchanger of the oxide stripping tower is a shell-and-tube heat exchanger, the feeding of the oxide stripping tower is carried out on a shell side, and the discharging of the oxide stripping tower is carried out on a tube side.
Furthermore, an oxide stripping tower discharging control valve is arranged on a pipeline of the oxide stripping tower feeding and discharging heat exchanger connected with the wastewater cooler, the oxide stripping tower is provided with a remote transmission liquid level controller, and the oxide stripping tower discharging control valve is connected with the liquid level controller in a cascade control mode.
Further, the quenching waste water tank is also connected to a waste water cooler through a pipeline.
Further, the top discharge pipeline of the oxide stripping tower is also connected to the reactor through a stop valve.
MTO quench water reduce COD device, through addding process flow, reduce quench waste water COD, reduce sewage treatment load. The device brings an oxide stripping tower, an oxide stripping tower feeding and discharging heat exchanger, a wastewater cooler, a filter and the like into an MTO (methanol to olefins) quenching water treatment process, quenching wastewater from a quenching wastewater tank enters the oxide stripping tower after being filtered and subjected to heat exchange, and the bottom discharge of the oxide stripping tower sends the quenching wastewater after being stripped to the wastewater cooler for cooling and then carries out wastewater treatment; and the top stripping material of the oxide stripping tower is connected with a torch through a pressure control valve for discharging, or is connected with the reactor for recycling, and the oxide is recovered and sent to the reactor for reaction to generate olefin.
Has the advantages that: the utility model discloses a device that MTO rapid cooling waste water reduced COD through addding process flow, will sharply cool waste water and carry out the strip processing through oxide strip tower, through the heat transfer recovery energy simultaneously, can effectively reduce sharp cooling waste water COD, reduce sewage treatment load, reduce the volume of discharging water, increase the waste water rate of recovery.
Drawings
FIG. 1 is a schematic view showing the structure of the apparatus for reducing COD in MTO quenched wastewater of the present invention;
1-quench wastewater control valve; 2-a filter; 3-oxide stripping tower feeding and discharging heat exchanger; a 4-oxide stripper; 5-a reboiler; 6-a condensate tank; 7-a pump; 8-oxide stripping tower discharge control valve; 9-a wastewater cooler; 10-low pressure condensate flow control valve; 11-an oxygenate stripper pressure control valve; 12-oxide stripper to reactor shut-off valve; 13-cutting valve for quenching waste water to quench tower; 14-circulating water upper control valve; 15-circulating water return control valve; 16-shut-off valve from water wash column to oxygenate stripper column.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims.
As shown in figure 1, the device for reducing COD by MTO quenching water provided by the utility model comprises a quenching waste water tank (not shown in the figure), wherein the quenching waste water is pumped to a waste water cooler 9 or an oxide stripping tower 4 by a waste water pump, and the quenching waste water enters the oxide stripping tower 4 for stripping.
A pipeline from the quenching wastewater tank to the oxide stripping tower 4 is sequentially connected with a quenching wastewater control valve 1, the quenching wastewater control valve 1 is connected with a filter 2, the filter 2 is connected with a shell pass of a feeding and discharging heat exchanger 3 of the oxide stripping tower, the shell pass of the feeding and discharging heat exchanger 3 of the oxide stripping tower is connected with the oxide stripping tower 4, and the quenching wastewater tank is provided with a remote liquid level controller which is connected with the quenching wastewater control valve 1 in a serial control manner to control the quenching wastewater control valve 1;
the top of the oxide stripping tower 4 is provided with an oxide stripping tower pressure control valve 11, the oxide stripping tower 4 is provided with a pressure controller for controlling the oxide stripping tower pressure control valve 11, and the pressure control valve 11 is connected with a torch; the top discharge of the oxide stripping tower 4 is also connected with a cut-off valve 12 from the oxide stripping tower to the reactor, and the stripped matter can be sent to the reactor or is cut off from the reactor by closing the oxide stripping tower to the cut-off valve 12 of the reactor;
the bottom of the oxide stripping tower 4 is provided with a reboiler 5, the bottom discharge of the oxide stripping tower 4 is connected with the tube pass of the feed and discharge heat exchanger 3 of the oxide stripping tower through a pump 7, the tube pass of the feed and discharge heat exchanger 3 of the oxide stripping tower is connected with a wastewater cooler 9, and the quenching wastewater is cooled by the wastewater cooler 9 and finally sent to a sewage treatment device; an oxide stripping tower discharging control valve 8 is arranged on a connecting pipeline of the device, a liquid level controller is arranged on the oxide stripping tower 4 and is in cascade control connection with the oxide stripping tower discharging control valve 8 to control the oxide stripping tower discharging control valve 8.
The reboiler 5 is connected with the heat exchange medium low-pressure steam LPS and the low-pressure condensate LC, the low-pressure condensate LC is connected with the condensate tank 6, and a low-pressure condensate flow control valve 10 is installed at an outlet at the bottom of the condensate tank 6; the waste water cooler 9 is connected with the heat exchange medium circulating water upper water CWS and the circulating water return water CWR, and a circulating water upper water control valve 14 and a circulating water return water control valve 15 are respectively arranged between the circulating water upper water CWS and the circulating water return water CWR and the waste water cooler 9.
A connection pipeline from the water washing tower to the oxide stripping tower 4 in the original quenching water washing process is provided with a cut-off valve 16, and the cut-off valve 16 from the water washing tower to the oxide stripping tower 4 is used for cutting off the water washing water to the oxide stripping tower 4. In the conventional process, a shut valve 13 is provided in a connection pipe for discharging (stripped quenching water) from the oxide stripping tower 4 to a quenching tower (not shown), and the stripped quenching waste water is shut off by the shut valve 13 to the quenching tower.
When the device of the utility model is used for reducing the COD of quenching wastewater, the quenching water from the quenching wastewater tank controls the liquid level of the quenching wastewater tank through the flow control valve, the quenching water passes through the filter, the filtered quenching water enters the feeding and discharging heat exchanger of the oxide stripping tower to exchange heat with the material at the bottom of the oxide stripping tower, the shell pass outlet of the feeding and discharging heat exchanger of the oxide stripping tower and the tube pass outlet of the feeding and discharging heat exchanger of the oxide stripping tower are respectively provided with a temperature sensor to detect the heat exchange effect, and the quenching water after heat exchange enters the oxide stripping tower; after stripping, the bottom of the oxide stripping tower is pressurized by a pump, passes through a feeding and discharging heat exchanger of the oxide stripping tower for heat exchange, enters a wastewater cooler through a flow regulating valve, is cooled to 40 ℃ and is sent to sewage treatment, and the liquid level of the oxide stripping tower and a bottom discharging control valve form a channeling control loop to control the liquid level at the bottom of the oxide stripping tower; the oxide stripping tower is provided with a temperature sensor, and the temperature of the oxide stripping tower is controlled by a condensate regulating valve at the bottom of the condensate tank through a liquid level sensor of the condensate tank; the top pressure of the oxide stripping tower is controlled by a detection signal of a pressure sensor at the top of the tower, the control pressure control valve controls the top pressure of the oxide stripping tower to be stable, and stripped oxides and other substances are discharged into a torch. In the original flow, the water washing tower is connected to an oxide stripping tower, the top of the oxide stripping tower is connected to a reactor, and the stripped quenching water is connected to a quenching tower and isolated by closing a stop valve and installing a blind plate.
Claims (7)
1. A device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater comprises a quenching wastewater tank, and is characterized by further comprising a filter, an oxide stripping tower feeding and discharging heat exchanger, an oxide stripping tower and a wastewater cooler, wherein the quenching wastewater tank is sequentially connected with the filter, the oxide stripping tower feeding and discharging heat exchanger and the oxide stripping tower through pipelines; and a discharge pipeline at the top of the oxide stripping tower is connected with a torch through a pressure control valve.
2. The apparatus for reducing COD in MTO quenched wastewater according to claim 1, wherein the bottom of the oxide stripping tower is provided with a reboiler.
3. The apparatus for reducing COD in MTO quenched wastewater according to claim 1, wherein the pipeline of the filter connected to the quenched wastewater tank is provided with a quenched wastewater control valve, the quenched wastewater tank is provided with a remote liquid level controller, and the quenched wastewater control valve is connected with the liquid level controller in a cascade control manner.
4. The device for reducing COD in waste water from MTO quenching as claimed in claim 1, wherein the feeding and discharging heat exchanger of the oxide stripping tower is a shell-and-tube heat exchanger, the feeding of the oxide stripping tower is carried out on the shell side, and the discharging of the oxide stripping tower is carried out on the tube side.
5. The device for reducing COD in MTO quenching wastewater as claimed in claim 1, wherein the pipeline connecting the oxide stripper feed/discharge heat exchanger with the wastewater cooler is provided with an oxide stripper discharge control valve, the oxide stripper is provided with a remote transmission liquid level controller, and the oxide stripper discharge control valve is connected with the liquid level controller in a cascade control manner.
6. The apparatus for reducing COD in MTO quenched wastewater according to claim 1, wherein the quenched wastewater tank is further piped to a wastewater cooler.
7. The apparatus for reducing COD in MTO quenched wastewater according to claim 1, wherein the top discharge pipeline of the oxide stripper is further connected to the reactor through a shut-off valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021400526.6U CN212800010U (en) | 2020-07-16 | 2020-07-16 | Device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021400526.6U CN212800010U (en) | 2020-07-16 | 2020-07-16 | Device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212800010U true CN212800010U (en) | 2021-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021400526.6U Active CN212800010U (en) | 2020-07-16 | 2020-07-16 | Device for reducing COD (chemical oxygen demand) of MTO (methanol to olefin) quenching wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212800010U (en) |
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2020
- 2020-07-16 CN CN202021400526.6U patent/CN212800010U/en active Active
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