Device for treating high-salinity wastewater

Abstract

The utility model provides a device for treating high-salinity wastewater, which is characterized in that a wastewater pump is connected with a filter box, the filter box is connected with a buffer tank, the buffer tank is connected with a material inlet of a heat exchanger through a wastewater delivery pump, a material outlet of the heat exchanger 5 is connected with an evaporation tank, and the bottom of the evaporation tank is connected with a rotary dryer through a strong brine extraction pump; and the rotary dryer is respectively connected with the steam condensate water and waste salt discharging machine. The evaporation tank is connected with the cyclone separator, the cyclone separator is connected with the washing tower, the washing tower is connected with the steam compressor, and the steam compressor is connected with a jacket inlet of the heat exchanger. According to the utility model, by using the steam compressor, the evaporated gas is recycled, the energy consumption is saved, and the treatment cost is reduced. And after the concentrated waste brine is dried by the rotary dryer, the energy consumption can be greatly reduced compared with the direct drying of the waste water. Condensate water generated by the device can be recycled, and the purpose of fully utilizing water resources is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating high-salt wastewater. Background Art

[0002] Wastewater treatment is the use of physical, chemical and biological methods to treat wastewater, separate the pollutants in the wastewater or convert them into harmless substances, purify the wastewater, reduce pollution, and even recycle and reuse wastewater to make full use of water resources.

[0003] High-salt wastewater contains high concentrations of soluble ionic salts and organic pollutants. If it is discharged directly into the environmental water body without treatment, it will not only cause adverse effects and damage to the environmental water body, but also cause a large amount of toxic and harmful organic substances to endanger human health.

[0004] At present, high-salt wastewater is mainly treated by dilution and distillation desalination to reduce its salt content. The dilution method consumes a large amount of water resources to achieve biodegradable water quality, which is not suitable for enterprises and is therefore not adopted. Another method is distillation desalination. The distillation desalination method desalinates by evaporating water into water vapor and leaving salt residue during the distillation process. The water vapor generated in this process also contains a large amount of heat, which is often not well utilized, resulting in heat waste. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a device for treating high-salt wastewater, including a wastewater pump connected to a filter box, the filter box connected to a buffer tank, the buffer tank connected to a wastewater delivery pump, the wastewater delivery pump connected to a heat exchanger material inlet, the heat exchanger material outlet connected to an evaporator, the evaporator connected to a cyclone separator, the cyclone separator connected to a washing tower, the washing tower connected to a steam compressor, the steam compressor connected to a heat exchanger jacket inlet, the heat exchanger jacket outlet connected to an evaporation condensation water tank, the evaporation condensation water tank connected to a washing pump, the washing pump connected to the washing tower. The lower middle part of the evaporator is connected to a forced circulation pump, the bottom of the evaporator is connected to a concentrated brine extraction pump, the concentrated brine extraction pump is connected to a rotary dryer, the rotary dryer is connected to a condensation absorption tower, the condensation absorption tower is connected to an exhaust gas circulation pump, and the circulation pump is connected to the buffer tank.

[0006] In the preferred embodiment, the filter box adopts a multi-media filter, and uses filter layers such as quartz sand and anthracite to intercept suspended impurities in the water.

[0007] In a preferred embodiment, the heat exchanger initially uses live steam to heat the waste brine.

[0008] In the preferred embodiment, the material in the evaporation tank enters the heat exchanger through a forced circulation pump, where it is evaporated and concentrated to generate evaporated gas. After the evaporated gas passes through a cyclone separator and a washing tower to wash the evaporated gas, it enters a steam compressor, where the steam temperature and pressure are increased, and the steam enters the heat exchanger to heat the wastewater instead of the raw steam. The condensate enters the evaporation condensate water tank, and the evaporated condensate passes through a washing pump to the washing tower to wash and extract the evaporated gas.

[0009] In the preferred embodiment, the feed of the rotary dryer is sprayed. After the concentrated brine is dried, the evaporated gas enters the condensation absorption tower and is condensed first. The uncondensed gas enters the absorption tower for absorption and then is discharged. The condensate is extracted to the buffer tank through the tail gas circulation pump.

[0010] In the preferred embodiment, the rotary dryer uses steam as a heat source, and the heat exchange design is determined by the concentration of the concentrated brine and the moisture value requirements of the discharged waste salt. The length of the dryer, the raw steam condensate can be reused as system recycled water.

[0011] In the preferred embodiment, the evaporation tank, the outer shell and the condenser are provided with a temperature control system, and the purpose of evaporation of the solution is achieved by controlling the temperature. A liquid level control is also provided to facilitate monitoring of the liquid level and timely addition or discharge of concentrated liquid.

[0012] In the preferred embodiment, the evaporative condensed water and the absorbed water produced by the condensation absorption tower can be returned to the buffer tank for recycling. After the condensed water in the evaporative condensed water tank reaches a certain liquid level, it can be extracted for use in other systems or enter the sewage treatment device.

[0013] Beneficial effects of the utility model:

[0014] 1. By using steam compressors, the evaporated gas is recycled to save energy and reduce processing costs.

[0015] 2. After the concentrated waste brine is dried by a rotary dryer, the energy consumption can be greatly reduced compared to directly drying the wastewater.

[0016] 3. The condensed water produced by the device can be recycled to achieve the purpose of making full use of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a device for treating high-salinity wastewater.

[0018] In the figure: wastewater pump 1, filter box 2, buffer tank 3, wastewater delivery pump 4, heat exchanger 5, evaporator 6, cyclone separator 7, washing tower 8, steam compressor 9, evaporation condensate tank 10, washing pump 11, forced circulation pump 12, brine extraction pump 13, rotary dryer 14, condensation absorption tower 15, tail gas circulation pump 16, steam condensate 17, waste salt discharger 18. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] A device for treating high-salinity wastewater comprises: a wastewater pump 1 connected to a filter box 2, the filter box 2 connected to a buffer tank 3, the buffer tank 3 connected to a wastewater delivery pump 4, the wastewater delivery pump 4 connected to a material inlet of a heat exchanger 5, the material outlet of the heat exchanger 5 connected to an evaporation tank 6, the evaporation tank 6 connected to a cyclone separator 7, the cyclone separator 7 connected to a washing tower 8, the washing tower 8 connected to a steam compressor 9, the steam compressor 9 connected to a jacket inlet of the heat exchanger 5, the jacket outlet of the heat exchanger 5 connected to an evaporation condensation water tank 10, the evaporation condensation water tank 10 connected to a washing pump 11, and the washing pump 11 connected to the washing tower 8. The lower middle part of the evaporation tank 6 is connected to a forced circulation pump 12, the bottom of the evaporation tank 6 is connected to a concentrated brine extraction pump 13, the concentrated brine extraction pump 13 is connected to a rotary dryer 14, the rotary dryer 14 is connected to a condensation absorption tower 15, the condensation absorption tower 15 is connected to an exhaust gas circulation pump 16, and the exhaust gas circulation pump 16 is connected to the buffer tank 3.

[0022] The filter box 2 adopts a multi-media filter, and uses filter layers such as quartz sand and anthracite to intercept suspended impurities in the water.

[0023] The heat exchanger 5 initially uses live steam to heat the waste brine.

[0024] The material in the evaporation tank 6 enters the heat exchanger 5 through the forced circulation pump 12, and is evaporated and concentrated in the evaporation tank 6 to generate evaporated gas. After the evaporated gas passes through the cyclone separator 7 and the washing tower 8 to wash the evaporated gas, it enters the steam compressor 9. The steam compressor 9 increases the steam temperature and pressure, and replaces the raw steam to enter the heat exchanger 5 to heat the wastewater. The condensate enters the evaporation condensate tank 10, and the evaporated condensate passes through the washing pump 11 to the washing tower 8 to wash and extract the evaporated gas.

[0025] The rotary dryer 14 is fed by spraying. After the concentrated brine is dried, the evaporated gas enters the condensation absorption tower 15 and is condensed first. The uncondensed gas enters the absorption tower for absorption and then is discharged. The condensate is extracted to the buffer tank 3 through the tail gas circulation pump 16.

[0026] The rotary dryer 14 uses steam as a heat source. The heat exchange design is determined by the concentration of the concentrated brine and the moisture value requirements of the discharged waste salt. The length of the dryer and the condensed water of the raw steam can be reused as system recycled water.

[0027] The evaporation tank 6 is provided with a temperature control system inside, outside and condenser, and the purpose of evaporation of the solution is achieved by controlling the temperature. A liquid level control is also provided to facilitate monitoring of the liquid level and timely addition or discharge of concentrated liquid.

[0028] The evaporative condensed water and the absorbed water produced by the condensation absorption tower 15 can be returned to the buffer tank for recycling. After the condensed water in the evaporative condensed water tank 15 reaches a certain liquid level, it can be extracted for use in other systems or enter into a sewage treatment device.

[0029] Example 2

[0030] The working principle of a device for treating high-salinity wastewater is as follows:

[0031] During operation, high-salt wastewater is transported to the filter box 2 through the wastewater pump, and the water-insoluble suspended impurities in the high-salt wastewater are filtered. The filtered wastewater enters the buffer tank 3, and the wastewater delivery pump 4 is turned on to transport the filtered high-salt wastewater to the evaporator 6 through the heat exchanger 5. The high-salt wastewater is heated by the initial steam in the heat exchanger 5 to increase its temperature and enters the evaporator 5. Under the action of the forced circulation pump 12, the high-salt wastewater produces evaporated gas in the evaporator 6. The evaporated gas passes through the cyclone condenser 7 to separate part of the liquid entrainment, and then enters the washing tower 8. The evaporated gas is washed with condensed water from the evaporation condensation water tank 10. The steam after washing enters the steam compressor 9, and the steam compressor 9 is turned on to increase the steam temperature and pressure. When the temperature and pressure reach the initial steam pressure, it is switched with the raw steam, and the steam compressor is used to supply heat to the heat exchanger.

[0032] The high-salt wastewater in the evaporator 6 is continuously evaporated and concentrated to crystallize waste salt. After reaching a supersaturated state, it is transported to the rotary dryer 14 by the concentrated brine extraction pump 13. In the rotary dryer 14, the salt crystals in the concentrated brine are dried by raw steam, and the dried waste salt is discharged and packaged by the waste salt discharging machine 18. The evaporation gas generated during the drying process is condensed and absorbed by the condensation absorption tower 15, and the condensed liquid is transported to the front buffer tank of the device by the tail gas circulation pump 16 for re-evaporation, and the non-condensable gas is discharged through the vent pipe.

[0033] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for treating high-salinity wastewater, characterized in that: The wastewater pump (1) is connected to the filter box (2), the filter box (2) is connected to the buffer tank (3), the buffer tank (3) is connected to the material inlet of the heat exchanger (5) via the wastewater delivery pump (4), the material outlet of the heat exchanger (5) is connected to the evaporation tank (6), the bottom of the evaporation tank (6) is connected to the rotary dryer (14) via the concentrated brine extraction pump (13), and the rotary dryer (14) is respectively connected to the steam condensate (17) and the waste salt discharge machine (18).

2. A device for treating high-salinity wastewater according to claim 1, characterized in that: The evaporation tank (6) is connected to the cyclone separator (7), the cyclone separator (7) is connected to the washing tower (8), the washing tower (8) is connected to the steam compressor (9), and the steam compressor (9) is connected to the jacket inlet of the heat exchanger (5).

3. A device for treating high-salinity wastewater according to claim 2, characterized in that: The jacket outlet of the heat exchanger (5) is connected to the evaporative condensate water tank (10), the evaporative condensate water tank (10) is connected to the washing pump (11), and the washing pump (11) is connected to the washing tower (8).

4. The device for treating high-salinity wastewater according to claim 1, characterized in that: The lower middle portion of the evaporation tank (6) is connected to a forced circulation pump (12), and the forced circulation pump (12) is connected to the heat exchanger (5).

5. The device for treating high-salinity wastewater according to claim 1, characterized in that: The rotary dryer (14) is connected to the condensation absorption tower (15), the condensation absorption tower (15) is connected to the tail gas circulation pump (16), and the tail gas circulation pump (16) is connected to the buffer tank (3).

6. The device for treating high-salinity wastewater according to claim 1, characterized in that: The evaporation tank, the outer shell and the condenser are provided with a temperature control system, and the purpose of evaporation of the solution is achieved by controlling the temperature. A liquid level control is also provided to facilitate monitoring of the liquid level and timely addition or discharge of concentrated liquid.

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