Device for treating coking sewage concentrated solution with low power consumption by utilizing waste heat of wastewater
By designing a device that includes a single-effect heat exchanger and a vacuum evaporator, the waste heat from ammonia stripping wastewater is used to heat concentrated brine, solving the problem of high energy consumption in coking wastewater treatment and achieving low-power concentrated brine treatment and sodium salt recovery.
Patent Information
- Application Number
- CN202423318177.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In the treatment of coking wastewater, steam heating consumes a large amount of steam, heat pump heating consumes a large amount of electricity, and concentrated brine treatment consumes a large amount of energy. Existing technologies are not able to efficiently utilize the waste heat of wastewater for low-energy treatment.
Design a device comprising a single-effect heat exchanger, a single-effect vacuum evaporator, a double-effect heat exchanger, a double-effect vacuum evaporator, a solid-liquid separator, and a vacuum dryer. Utilize the waste heat from ammonia stripping wastewater to heat concentrated brine and recover sodium salts through negative pressure evaporation, thereby reducing energy consumption.
The system achieves low-power treatment of coking wastewater concentrate by cooling the wastewater with waste heat and heating the concentrated brine with ammonia stripping wastewater, thus reducing energy consumption. The rationally designed device can efficiently recover sodium salts.
Smart Images
Figure CN223752470U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of sewage treatment, specifically relates to a device for treating coking sewage concentrate by utilizing waste water residual heat and low power consumption. BACKGROUND
[0002] The water quality of coking wastewater varies due to different process flows and production operation modes, and the salt content of concentrated brine formed after evaporation of cooling water used in the process of dephenolization, ammonia evaporation, biochemical treatment and reuse in a general coking plant is high; the water volume is usually not large, and varies with the coking scale, from several tons to dozens of tons per hour, and the treatment of concentrated brine currently mainly adopts steam heating or heat pump for distillation and concentration, the evaporated water is recycled, and the precipitated crystals can be used as sodium salt products, but steam heating consumes a large amount of steam, and heat pump heating consumes a large amount of electricity.
[0003] Coking wastewater has the characteristics of large variation in water quality and quantity and complex composition, and its source is mainly residual ammonia water. It is wastewater generated in the process of coal dry distillation and coal gas cooling, and the water volume accounts for about half of the total amount of coking wastewater, and the temperature of ammonia evaporation wastewater out of the tower is generally 95-100 DEG C. At present, in order to meet the temperature requirement of the rear end treatment, the cooling measure is circulating water cooling.
[0004] Therefore, it is of great significance to design a device for cooling ammonia evaporation wastewater by using concentrated brine and simultaneously treating concentrated brine. CONTENT OF THE UTILITY MODEL
[0005] In order to solve the problems in the above-mentioned technology, the utility model provides a device for treating coking wastewater concentrate by utilizing waste water residual heat and low power consumption, which comprises a one-effect heat exchanger, a one-effect vacuum evaporator, a two-effect heat exchanger, a two-effect vacuum evaporator, a solid-liquid separator and a vacuum dryer.
[0006] The liquid outlet of the one-effect heat exchanger is communicated with the liquid inlet of the one-effect vacuum evaporator, and the heat source inlet of the one-effect heat exchanger is communicated with the water inlet pipeline of high-temperature wastewater.
[0007] The exhaust port of the one-effect vacuum evaporator is communicated with the heat source inlet of the two-effect heat exchanger, the liquid outlet of the one-effect vacuum evaporator is communicated with the liquid inlet of the two-effect heat exchanger, the liquid outlet of the two-effect heat exchanger is communicated with the liquid inlet of the two-effect vacuum evaporator, the high-concentration brine discharge port of the two-effect heat exchanger is communicated with the vacuum dryer, the exhaust port of the two-effect heat exchanger is communicated with the inside of the vacuum dryer, and the backwater port of the two-effect vacuum evaporator is communicated with the liquid inlet of the two-effect heat exchanger.
[0008] The liquid outlet of the two-effect vacuum evaporator is communicated with the solid-liquid separator.
[0009] The exhaust port of the two-effect vacuum evaporator is communicated with the vacuum unit.
[0010] The exhaust port of the vacuum dryer is connected to the vacuum unit.
[0011] A steam-water condenser is installed on the pipeline between the vacuum unit, the vacuum dryer, and the double-effect vacuum evaporator.
[0012] The solid discharge ports of the solid-liquid separator and the vacuum dryer are connected to the drying and packaging machine.
[0013] The single-effect heat exchanger is a spiral plate heat exchanger.
[0014] The beneficial effects of this utility model are as follows: it does not use a heat pump, but uses concentrated brine to cool the ammonia-removing wastewater, while simultaneously using the ammonia-removing wastewater to heat the concentrated brine. Combined with negative pressure evaporation, the concentrated brine is treated and sodium salt is recovered. It has low energy consumption and a reasonable design. Attached Figure Description
[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0016] Figure 1 This is a schematic diagram of the device connection relationship of this utility model. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0018] like Figure 1 As shown in the embodiment, an apparatus for treating coking wastewater concentrate using waste heat with low power consumption is provided, including a first-effect heat exchanger, a first-effect vacuum evaporator, a second-effect heat exchanger, a second-effect vacuum evaporator, a solid-liquid separator, and a vacuum dryer.
[0019] The drain port of the first-effect heat exchanger is connected to the inlet of the first-effect vacuum evaporator, and the heat source inlet of the first-effect heat exchanger is connected to the inlet pipe of the high-temperature wastewater.
[0020] The exhaust port of the first-effect vacuum evaporator is connected to the heat source inlet of the second-effect heat exchanger; the liquid outlet of the first-effect vacuum evaporator is connected to the liquid inlet of the second-effect heat exchanger; the liquid outlet of the second-effect heat exchanger is connected to the liquid inlet of the second-effect vacuum evaporator; the high-concentration brine discharge port of the second-effect heat exchanger is connected to the vacuum dryer; the exhaust port of the second-effect heat exchanger is connected to the interior of the vacuum dryer; and the water return port of the second-effect vacuum evaporator is connected to the liquid inlet of the second-effect heat exchanger.
[0021] The liquid outlet of the two-effect vacuum evaporator is communicated with the solid-liquid separator.
[0022] The exhaust outlet of the two-effect vacuum evaporator is communicated with the vacuum unit, and the exhaust outlet of the vacuum drying machine is communicated with the vacuum unit.
[0023] A steam-water condenser is arranged on the pipeline between the vacuum unit and the vacuum drying machine and the two-effect vacuum evaporator.
[0024] The solid discharge outlets of the solid-liquid separator and the vacuum drying machine are communicated with the drying packaging machine, and the one-effect heat exchanger is a spiral plate heat exchanger.
[0025] The utility model discloses a continuous treatment to coking wastewater concentrated liquid, and the working principle is as follows, Figure 1 As shown in the figure, the heat source inlet of the one-effect heat exchanger is connected with high-temperature ammonia distillation wastewater, and the ammonia distillation wastewater is discharged from the heat source outlet of the one-effect heat exchanger after heat exchange, and since the ammonia distillation wastewater has high oil content, the oil changes phase after heat exchange, so the one-effect heat exchanger adopts a spiral plate heat exchanger.
[0026] The concentrated brine enters the one-effect heat exchanger, exchanges heat with the high-temperature ammonia distillation wastewater, is heated, and is transported to the liquid inlet of the one-effect vacuum evaporator through the liquid outlet, is subjected to primary vacuum concentration, and generates high-temperature steam and low-temperature liquid.
[0027] The steam discharged from the one-effect vacuum evaporator is input into the heat source inlet of the two-effect heat exchanger through the exhaust outlet, and the liquid discharged from the one-effect vacuum evaporator is input into the liquid inlet of the two-effect heat exchanger through the liquid outlet, and in the two-effect heat exchanger, the high-temperature steam reheats the low-temperature concentrated brine after primary concentration, and the heat source outlet of the two-effect heat exchanger sends the steam after heat exchange into the vacuum drying machine.
[0028] The liquid outlet of the two-effect heat exchanger inputs the concentrated brine after reheating into the liquid inlet of the two-effect vacuum evaporator, and the concentrated brine is subjected to flash evaporation in the two-effect vacuum evaporator, the crystals generated by flash evaporation are sent into the solid-liquid separator to be subjected to solid-liquid separation, and the backwater outlet of the two-effect vacuum evaporator sends the concentrated brine after flash evaporation back to the two-effect heat exchanger to be reheated again, and the concentrated brine mixed with the concentrated brine sent out by the one-effect vacuum evaporator is input into the two-effect vacuum evaporator again to be subjected to flash evaporation, thereby forming a cycle.
[0029] The two-effect vacuum evaporator sends the fluid mixed with the crystals after flash evaporation into the solid-liquid separator through the liquid outlet.
[0030] With the continuous circulation, the concentration of the brine in the cycle becomes higher and higher, until flash evaporation cannot be performed, at which time the high-concentration brine discharge outlet of the two-effect heat exchanger is opened, and the high-concentration brine is sent into the vacuum drying machine to form crystals.
[0031] The steam discharged by the vacuum drier and the two-effect vacuum evaporator is extracted by the vacuum unit after passing through a steam-water condenser, and the vacuum unit provides negative pressure for the one-effect vacuum evaporator, the two-effect vacuum evaporator and the vacuum drier in the device and provides power for the flow of steam.
[0032] The crystals generated by the solid-liquid separator and the vacuum drier are sent to a drying and packaging machine to package sodium salt products.
[0033] In the present application, the one-effect heat exchanger is a spiral plate heat exchanger, and the channel width is greater than or equal to 2 cm; the two-effect heat exchanger is a long-tube single-tube-pass heat exchanger.
[0034] The vacuum drier is a rake-type vacuum drier or a vacuum crystallization kettle.
[0035] The solid-liquid separator is a centrifugal machine or a three-foot bag-type separator.
[0036] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
Claims
1. A device for treating coking wastewater concentrate with low power consumption by utilizing waste water residual heat, characterized in that, The system comprises a one-effect heat exchanger, a one-effect vacuum evaporator, a two-effect heat exchanger, a two-effect vacuum evaporator, a solid-liquid separator and a vacuum dryer. The liquid outlet of the one-effect heat exchanger is communicated with the liquid inlet of the one-effect vacuum evaporator, and the heat source inlet of the one-effect heat exchanger is communicated with the water inlet pipeline of high-temperature wastewater. The exhaust outlet of the one-effect vacuum evaporator is communicated with the heat source inlet of the two-effect heat exchanger, the liquid outlet of the one-effect vacuum evaporator is communicated with the liquid inlet of the two-effect heat exchanger, the liquid outlet of the two-effect heat exchanger is communicated with the liquid inlet of the two-effect vacuum evaporator, the high-concentration brine discharge outlet of the two-effect heat exchanger is communicated with the vacuum dryer, the exhaust outlet of the two-effect heat exchanger is communicated with the inside of the vacuum dryer, and the backwater outlet of the two-effect vacuum evaporator is communicated with the liquid inlet of the two-effect heat exchanger. The liquid outlet of the two-effect vacuum evaporator is communicated with the solid-liquid separator.
2. The device for treating coking wastewater concentrate with low power consumption by utilizing waste heat according to claim 1, characterized in that, The exhaust outlet of the two-effect vacuum evaporator is communicated with a vacuum unit. The exhaust outlet of the vacuum dryer is communicated with the vacuum unit.
3. The device for treating coking wastewater concentrate with low power consumption by utilizing waste heat according to claim 2, characterized in that, A steam-water condenser is arranged on the pipeline between the vacuum unit and the vacuum dryer and the two-effect vacuum evaporator.
4. The device for treating coking wastewater concentrate with low power consumption by utilizing waste heat according to claim 3, characterized in that, The solid discharge outlets of the solid-liquid separator and the vacuum dryer are communicated with a drying and packaging machine.
5. The device for treating coking wastewater concentrate with low power consumption by utilizing waste heat according to any one of claims 1-4, characterized in that, The one-effect heat exchanger is a spiral plate heat exchanger.