CN214734960U - Coal gasification wastewater two-stage treatment unit - Google Patents

Abstract

The utility model discloses a coal gasification waste water secondary treatment unit, it includes the pipe chute sedimentation tank, the delivery pump, filter the jar, the self-cleaning filter, ozone catalytic oxidation pond and stable pond, the outlet of pipe chute sedimentation tank and the import pipeline intercommunication of delivery pump, the export of delivery pump and the import pipeline intercommunication of filtering the jar, the export of filtering the jar and the import pipeline intercommunication of self-cleaning filter, the export of self-cleaning filter and the inlet tube way intercommunication in ozone catalytic oxidation pond, the outlet pipe in ozone catalytic oxidation pond and the import pipeline intercommunication in stable pond. The advantages are that: the inclined tube sedimentation tank, the filter tank and the self-cleaning filter are adopted to realize gradual sedimentation separation of large particles and fine impurities in the sewage, and the ozone catalytic oxidation tank is combined to treat the sewage, so that the operation is flexible and convenient, the COD and the chromaticity of the effluent can be controlled by adjusting the ozone adding amount, the process flow is simple, the operation cost is low, the labor intensity is low, and the cleaning is clean and has no secondary pollution.

Description

Coal gasification wastewater two-stage treatment unit

The technical field is as follows:

the utility model relates to a coal gasification waste water technical field, specifically speaking relates to a coal gasification waste water secondary treatment unit.

Background art:

the BGL gasification furnace ash in the urea production system generates a large amount of high-concentration coal gasification wastewater, and has the characteristics of high COD, high chroma, high ammonia nitrogen, high phenol, high oil content, high salt content, more refractory organic matters, low B/C ratio and the like; the COD of the coal gasification wastewater is 3000-5000 mg/L. The coal gasification wastewater treatment system generally comprises a primary treatment unit, a secondary treatment unit and a tail gas treatment unit, wherein the secondary treatment unit is generally a carbon adsorption method, a chemical coagulation precipitation method or a biological method, and the like, but because the effluent of the primary treatment unit is mainly characterized by nondegradable pollutants such as polyphenol, heterocycle, benzene series and the like, the COD of the effluent after passing through the primary treatment unit is 200-360 mg/L, the chroma is 600-1500 ℃, the biodegradability of the effluent of the primary treatment unit is very poor, the effluent directly enters the secondary treatment unit, the treatment effect of the secondary treatment unit is poor, and the effluent index is difficult to reach the standard; and has the problems of high operating cost, large sludge production amount, complex operation, poor chromaticity removing effect and the like.

The utility model has the following contents:

an object of the utility model is to provide a coal gasification waste water secondary treatment unit that treatment effect is good.

The utility model discloses by following technical scheme implement: the coal gasification wastewater secondary treatment unit comprises an inclined tube sedimentation tank, a conveying pump, a filter tank, a self-cleaning filter, an ozone catalytic oxidation tank and a stable water tank, wherein a water outlet of the primary treatment unit is communicated with an inlet pipeline of the inclined tube sedimentation tank, a water outlet of the inclined tube sedimentation tank is communicated with an inlet pipeline of the conveying pump, an outlet of the conveying pump is communicated with an inlet pipeline of the filter tank, an outlet of the filter tank is communicated with an inlet pipeline of the self-cleaning filter, an outlet of the self-cleaning filter is communicated with a water inlet pipeline of the ozone catalytic oxidation tank, and a water outlet pipe of the ozone catalytic oxidation tank is communicated with an inlet pipeline of the stable water tank; and the exhaust ports of the ozone catalytic oxidation tank and the stabilizing water tank are communicated with the inlet of the tail gas treatment unit.

Furthermore, the bottom of the inclined tube sedimentation tank comprises a plurality of funnel-shaped sludge discharge ports, the bottom of each sludge discharge port is communicated with the inlet of a sludge discharge pump through a sludge discharge pipe, and a sludge discharge control valve is installed on each sludge discharge pipe.

Furthermore, every behind the mud discharge control valve all install an automatic control valve on the mud pipe, the mud pipe of mud discharge control valve exit end respectively through dredging pipe with the pipeline intercommunication of delivery pump's exit end dredge the last mediation control valve that installs of dredging pipe.

Further, it includes two sludge discharge pumps altogether, just the bottom of pipe chute sedimentation tank includes six infundibulate mud discharging openings, every all install the stop valve on the entry of sludge discharge pump, two the intercommunication has defeated mud pipe between the entry of sludge discharge pump install defeated mud control valve on the defeated mud pipe, wherein three the mud discharging opening bottom the mud pipe with defeated mud control valve one side defeated mud pipe intercommunication, it is three in addition the mud discharging opening bottom the mud pipe with defeated mud control valve other end defeated mud pipe intercommunication.

Furthermore, an inlet of a back washing pump is communicated with a pipeline at the bottom of the stabilizing water tank, an outlet of the back washing pump is communicated with a back washing water inlet pipeline of the ozone catalytic oxidation tank through a washing pipe, and a washing control valve is installed on the washing pipe.

Furthermore, the device also comprises a backwashing fan, wherein the outlet of the backwashing fan is communicated with the backwashing gas inlet of the ozone catalytic oxidation tank through a backwashing air pipe, and a backwashing air control valve and a pressure control valve are installed on the backwashing air pipe.

Further, the ozone catalytic oxidation tank comprises a tank body, a water distribution pipe and a gas distribution pipe which are arranged up and down are arranged at the bottom of the tank body, an ozone pipe communicated with the gas distribution pipe is fixed on the outer wall of the tank body, and a water inlet pipe communicated with the water distribution pipe is fixed on the outer wall of the tank body; a backwashing water distribution pipe which is arranged opposite to the water distribution pipe is arranged above the water distribution pipe, and a backwashing water inlet which is communicated with the backwashing water distribution pipe is fixed on the outer wall of the tank body; a grid is fixed on the inner wall of the tank body above the backwashing water distribution pipe, a wire mesh is fixed at the top of the grid, and a first catalyst layer and a second catalyst layer which are arranged up and down are filled in the middle of the tank body above the wire mesh; the side wall of the upper part of the tank body is communicated with the water outlet pipe, a backwashing air distribution pipe with an upward outlet is fixed above the silk screen, and a backwashing air inlet communicated with the backwashing air distribution pipe is fixed on the outer wall of the tank body.

The utility model has the advantages that: the inclined tube sedimentation tank, the filter tank and the self-cleaning filter are adopted to realize gradual sedimentation separation of sludge, large particles and fine impurities in the sewage, and the ozone catalytic oxidation tank is combined to treat the sewage, so that the operation is flexible and convenient, the COD and the chromaticity of the discharged water can be controlled by adjusting the ozone adding amount, the process flow is simple, the operation cost is low, the labor intensity is low, the cleaning is realized, and no secondary pollution is caused; and the back washing water of the inclined tube sedimentation tank and the ozone catalytic oxidation tank comes from the system, so that the increase of the sewage quantity of the system can be reduced, and the energy consumption is reduced.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the ozone catalytic oxidation tank.

The device comprises an inclined tube sedimentation tank 1, a sludge discharge port 101, a delivery pump 2, a filter tank 3, a self-cleaning filter 4, an ozone catalytic oxidation tank 5, a backwashing water inlet 501, a backwashing gas inlet 502, a tank body 503, a water distribution pipe 504, a gas distribution pipe 505, an ozone pipe 506, a water inlet pipe 507, a backwashing water distribution pipe 508, a grid 509, a wire mesh 510, a first catalyst layer 512, a water outlet pipe 513, a backwashing gas distribution pipe 514, a second catalyst layer 515, a stabilization tank 6, a primary treatment unit 7, a tail gas treatment unit 8, a sludge discharge pipe 9, a sludge discharge pump 10, a sludge discharge control valve 11, an automatic control valve 12, a dredging pipe 13, a dredging control valve 14, a backwashing pump 16, a flushing pipe 17, a flushing control valve 18, a backwashing fan 19, a backwashing air pipe 20, a backwashing air control valve 21, a pressure control valve 22, a sludge discharge pipe 23, a sludge discharge control valve 24 and a stop valve 25.

The specific implementation mode is as follows:

in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and fig. 2, the coal gasification wastewater secondary treatment unit comprises an inclined tube sedimentation tank 1, a conveying pump 2, a filter tank 3, a self-cleaning filter 4, an ozone catalytic oxidation tank 5 and a stabilization water tank 6, wherein a water outlet of a primary treatment unit 7 is communicated with an inlet pipeline of the inclined tube sedimentation tank 1, and a water outlet of the inclined tube sedimentation tank 1 is communicated with an inlet pipeline of the conveying pump 2; the bottom of the inclined tube sedimentation tank 1 comprises a plurality of funnel-shaped sludge discharge ports 101, the bottom of each sludge discharge port 101 is communicated with the inlet of a sludge discharge pump 10 through a sludge discharge pipe 9, and a sludge discharge control valve 11 is installed on each sludge discharge pipe 9; the sludge discharge port 101 is funnel-shaped, so that sludge can be conveniently settled and discharged, and the sludge can be discharged through the sludge discharge pipe 9 by opening the sludge discharge control valve 11; the inclined tube sedimentation basin comprises two sludge discharge pumps 10, the bottom of the inclined tube sedimentation basin 1 comprises six funnel-shaped sludge discharge ports 101, a stop valve 25 is mounted at the inlet of each sludge discharge pump 10, a sludge conveying pipe 23 is communicated between the inlets of the two sludge discharge pumps 10, a sludge conveying control valve 24 is mounted on the sludge conveying pipe 23, the sludge discharge pipes 9 at the bottom ends of three sludge discharge ports 101 are communicated with the sludge conveying pipe 23 at one side of the sludge conveying control valve 24, and the sludge discharge pipes 9 at the bottom ends of the other three sludge discharge ports 101 are communicated with the sludge conveying pipe 23 at the other end of the sludge conveying control valve 24; the two sludge pumps 10 can work simultaneously or can be mutually standby; the sludge conveying control valve 24 is closed, the two stop valves 25 are opened, the two sludge pumps 10 are started, sludge discharged from the six sludge discharge ports 101 is divided into two parts to be discharged through the sludge conveying pipes 23 and the sludge pumps 10 on the corresponding sides respectively, the sludge discharge efficiency is improved, and the blocking frequency of the sludge discharge pipes 9 is reduced; when one of the sludge pumps 10 has a fault, the sludge conveying control valve 24 is opened, the stop valve 25 on the inlet of the faulty sludge pump 10 is closed, and all six sludge discharge ports 101 are discharged by the sludge conveying pipe 23 and the other sludge pump 10, so that the normal operation of the system is ensured; an automatic control valve 12 is arranged on each sludge discharge pipe 9 behind each sludge discharge control valve 11, the sludge discharge pipes 9 at the outlet ends of the sludge discharge control valves 11 are respectively communicated with a pipeline at the outlet end of the delivery pump 2 through dredging pipes 13, and dredging control valves 14 are arranged on the dredging pipes 13; in this embodiment, the sludge discharge control valve 11 is a manual control valve, and the automatic control valve 12 is a pneumatic control valve; the sludge discharge control valve 11 is a normally open control valve, the automatic control valve 12 is opened when sludge is discharged, and is closed in the rest time; in the running process of the system, the dredging control valve 14 is opened periodically, the delivery pump 2 is started, and part of water discharged by the delivery pump 2 is utilized to carry out back flushing on the sludge discharge pipe 9, so that the blockage fault of the sludge discharge pipe 9 is prevented, and the increase of the sewage quantity of the system is reduced;

the outlet of the delivery pump 2 is communicated with the inlet pipeline of the filter tank 3, the outlet of the filter tank 3 is communicated with the inlet pipeline of the self-cleaning filter 4, and the outlet of the self-cleaning filter 4 is communicated with the water inlet pipe 507 pipeline of the ozone catalytic oxidation tank 5; effluent of the primary treatment unit 7 firstly enters the inclined tube sedimentation tank 1, most suspended matters pass through the bottom of the inclined tube sedimentation tank, liquid flows upwards from an overflow port, the overflowed sewage is pressurized by the delivery pump 2 and then sent to the filter tank 3 to further remove suspended matters in the water, and then the effluent passes through the self-cleaning filter 4 and then enters the ozone catalytic oxidation tank 5;

the ozone catalytic oxidation tank 5 comprises a tank body 503, the bottom of the tank body 503 is provided with a water distribution pipe 504 and a gas distribution pipe 505 which are arranged up and down, the outer wall of the tank body 503 is fixed with an ozone pipe 506 communicated with the gas distribution pipe 505, and the outer wall of the tank body 503 is fixed with a water inlet pipe 507 communicated with the water distribution pipe 504; a backwashing water distribution pipe 508 arranged opposite to the water distribution pipe 504 is arranged above the water distribution pipe 504, and a backwashing water inlet 501 communicated with the backwashing water distribution pipe 508 is fixed on the outer wall of the tank body 503; a grid 509 is fixed on the inner wall of the tank body 503 above the backwashing water distribution pipe 508, a wire mesh 510 is fixed on the top of the grid 509, and the grid 509 plays a supporting role for the wire mesh 510 and a catalyst above the wire mesh; the middle part of the cell body 503 above the screen 510 is filled with a first catalyst layer 512 and a second catalyst layer 515 which are arranged up and down; the first catalyst layer 512 and the second catalyst layer 515 can be selected from common ozone catalysts, in this embodiment, the first catalyst layer 512 is an ozone catalyst, and the second catalyst layer 515 is a supporting ceramic ball; a water outlet pipe 513 is communicated with the side wall of the upper part of the tank body 503, a backwashing air distribution pipe 514 with an upward outlet is fixed above the silk screen 510, and a backwashing air inlet 502 communicated with the backwashing air distribution pipe 514 is fixed on the outer wall of the tank body 503. After entering the tank body 503 from the water inlet pipe 507 and the water distribution pipe 504, the wastewater passes through the grating 509, the screen 510, the second catalyst layer 515 and the first catalyst layer 512 from bottom to top, and simultaneously ozone is introduced into the tank body 503 through the ozone pipe 506 and the air distribution pipe 505, and the ozone generates hydroxyl radicals (OH) with stronger oxidation capability and non-selectivity under the action of the second catalyst layer 515 and the first catalyst layer 512, so that the organic matters which are difficult to degrade in the wastewater are subjected to ring opening and chain scission decomposition into micromolecule organic matters or are directly oxidized into carbon dioxide and water, unsaturated chromogenic groups are destroyed, and the COD, chromaticity and the like in the wastewater are effectively removed; through the treatment of the system, the COD and the chromaticity of the effluent are effectively reduced, and the effluent can meet the discharge standard.

A water outlet pipe 513 of the ozone catalytic oxidation tank 5 is communicated with an inlet pipeline of the stabilizing water tank 6; the water treated by the ozone catalytic oxidation tank 5 is discharged through a water outlet pipe 513 and then enters a stable water tank 6; the gas vents of the ozone catalytic oxidation pond 5 and the stable water pond 6 are communicated with the inlet of the tail gas treatment unit 8, and the gas exhausted from the ozone catalytic oxidation pond 5 and the stable water pond 6 enters the original tail gas treatment unit 8 to be treated.

The inlet of the back washing pump 16 is communicated with a pipeline at the bottom of the stabilization water tank 6, the outlet of the back washing pump 16 is communicated with a back washing water inlet 501 of the ozone catalytic oxidation tank 5 through a washing pipe 17, and a washing control valve 18 is arranged on the washing pipe 17; in the embodiment, the backwash pump 16 is a submersible pump, the backwash pump 16 and the flush control valve 18 are periodically opened, part of water in the stable water tank 6 is pumped to the backwash water distribution pipe 508 through the flush pipe 17 and the backwash water inlet 501, and then is downwards sprayed out through the backwash water distribution pipe 508, so that the water distribution pipe 504 is backwashed, and blockage is prevented;

the device also comprises a backwashing fan 19, the outlet of the backwashing fan 19 is communicated with a backwashing gas inlet 502 of the ozone catalytic oxidation tank 5 through a backwashing air pipe 20, and a backwashing air control valve 21 and a pressure control valve 22 are arranged on the backwashing air pipe 20; opening a backwashing air control valve 21, starting a backwashing fan 19, pressurizing air by the backwashing fan 19, conveying the air to the ozone catalytic oxidation tank 5 through a backwashing air pipe 20 and a backwashing air inlet 502, washing the catalyst in the ozone catalytic oxidation tank, further ensuring the catalytic effect of the catalyst, and after washing is finished, closing the backwashing air control valve 21 and the backwashing fan 19;

in this embodiment, the backwash air control valve 21, the flushing control valve 18, the backwash pump 16, the dredging control valve 14 and the automatic control valve 12 are all electrically connected with the plant DCS system and are controlled by the DCS system in a unified manner.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (8)

1. The coal gasification wastewater secondary treatment unit is characterized by comprising an inclined tube sedimentation tank, a conveying pump, a filter tank, a self-cleaning filter, an ozone catalytic oxidation tank and a stable water tank, wherein a water outlet of the primary treatment unit is communicated with an inlet pipeline of the inclined tube sedimentation tank, a water outlet of the inclined tube sedimentation tank is communicated with an inlet pipeline of the conveying pump, an outlet of the conveying pump is communicated with an inlet pipeline of the filter tank, an outlet of the filter tank is communicated with an inlet pipeline of the self-cleaning filter, an outlet of the self-cleaning filter is communicated with a water inlet pipeline of the ozone catalytic oxidation tank, and a water outlet pipe of the ozone catalytic oxidation tank is communicated with an inlet pipeline of the stable water tank; and the exhaust ports of the ozone catalytic oxidation tank and the stabilizing water tank are communicated with the inlet of the tail gas treatment unit.

2. The coal gasification wastewater secondary treatment unit as claimed in claim 1, wherein the bottom of the inclined tube sedimentation tank comprises a plurality of funnel-shaped sludge discharge ports, the bottom of each sludge discharge port is communicated with the inlet of a sludge discharge pump through a sludge discharge pipe, and a sludge discharge control valve is mounted on each sludge discharge pipe.

3. The coal gasification wastewater secondary treatment unit as claimed in claim 2, wherein an automatic control valve is installed on the sludge discharge pipe behind each sludge discharge control valve, the sludge discharge pipe at the outlet end of the sludge discharge control valve is respectively communicated with the pipeline at the outlet end of the delivery pump through a dredging pipe, and a dredging control valve is installed on the dredging pipe.

4. The secondary coal gasification wastewater treatment unit according to claim 2 or 3, comprising two sludge discharge pumps, wherein the bottom of the inclined tube sedimentation tank comprises six sludge discharge ports, a stop valve is installed at the inlet of each sludge discharge pump, a sludge conveying pipe is communicated between the inlets of the two sludge discharge pumps, a sludge conveying control valve is installed on the sludge conveying pipe, the sludge discharge pipes at the bottom ends of three sludge discharge ports are communicated with the sludge conveying pipe at one side of the sludge conveying control valve, and the sludge discharge pipes at the bottom ends of the other three sludge discharge ports are communicated with the sludge conveying pipe at the other end of the sludge conveying control valve.

5. The coal gasification wastewater secondary treatment unit as claimed in any one of claims 1 to 3, wherein an inlet of a back washing pump is communicated with the pipeline at the bottom of the stabilization water tank, an outlet of the back washing pump is communicated with a back washing water inlet pipeline of the ozone catalytic oxidation tank through a washing pipe, and a washing control valve is mounted on the washing pipe.

6. The coal gasification wastewater secondary treatment unit as claimed in any one of claims 1 to 3, further comprising a backwashing fan, wherein an outlet of the backwashing fan is communicated with a backwashing gas inlet of the ozone catalytic oxidation tank through a backwashing air pipe, and a backwashing air control valve and a pressure control valve are mounted on the backwashing air pipe.

7. The coal gasification wastewater secondary treatment unit as claimed in claim 5, further comprising a backwashing fan, wherein an outlet of the backwashing fan is communicated with a backwashing gas inlet of the ozone catalytic oxidation tank through a backwashing air pipe, and a backwashing air control valve and a pressure control valve are mounted on the backwashing air pipe.

8. The coal gasification wastewater secondary treatment unit according to claim 1, 2, 3 or 7, wherein the ozone catalytic oxidation tank comprises a tank body, a water distribution pipe and a gas distribution pipe are arranged at the bottom of the tank body, the water distribution pipe and the gas distribution pipe are arranged up and down, an ozone pipe communicated with the gas distribution pipe is fixed on the outer wall of the tank body, and the water inlet pipe communicated with the water distribution pipe is fixed on the outer wall of the tank body; a backwashing water distribution pipe which is arranged opposite to the water distribution pipe is arranged above the water distribution pipe, and a backwashing water inlet which is communicated with the backwashing water distribution pipe is fixed on the outer wall of the tank body; a grid is fixed on the inner wall of the tank body above the backwashing water distribution pipe, a wire mesh is fixed at the top of the grid, and a first catalyst layer and a second catalyst layer which are arranged up and down are filled in the middle of the tank body above the wire mesh; the side wall of the upper part of the tank body is communicated with the water outlet pipe, a backwashing air distribution pipe with an upward outlet is fixed above the silk screen, and a backwashing air inlet communicated with the backwashing air distribution pipe is fixed on the outer wall of the tank body.

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