Device for intensively recovering coal tar in semi-coke wastewater
By designing a strengthened recycling device including oil separator tank, primary filter, oxidation device, secondary filter and circulation device, the problem of low coal tar recovery efficiency in orchid wastewater is solved, and efficient removal of oil and dust is achieved, increasing economic value and reducing operating costs.
Patent Information
- Application Number
- CN202421759299.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The existing technology is difficult to efficiently recover and treat coal tar in orchid wastewater, resulting in a large load on subsequent treatment processes and insufficient economic value to be fully utilized.
A strengthened recycling device is designed, including an oil separator tank, a primary filter, an oxidation device, a secondary filter, a circulation device, a coal tar storage tank and a wastewater collection tank. Through the mutual cooperation of these devices, the oil and fine dust in the orchid wastewater are efficiently removed and the unoxidized substances are converted into coal tar.
It has achieved efficient removal of oil and dust in orchid wastewater, reduced the risk of congestion in subsequent phenol ammonia recovery processes, increased the economic value of coal tar, and reduced operating costs.
Smart Images
Figure CN222861357U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of blue coke wastewater treatment, and specifically relates to a device for strengthening the recovery of coal tar in blue coke wastewater. Background Art
[0002] Semi-coke wastewater, also known as semi-coke wastewater, refers to a type of industrial wastewater formed during the medium- and low-temperature dry distillation (about 450-650°C) process of low-metamorphosis coal (non-sticky coal, weakly sticky coal, long flame coal), as well as during the gas purification and semi-coke steam quenching process. In addition to a certain amount of high-molecular organic pollutants, semi-coke wastewater also contains a large amount of medium- and low-molecular pollutants that have not been oxidized by high temperatures. Semi-coke wastewater has the characteristics of complex composition, high pollutant concentration, and stable properties. Among them, inorganic pollutants mainly include sulfide, cyanide, ammonia nitrogen, and thiocyanide; organic pollutants are mainly coal tar substances, and the content of phenolic compounds is very high.
[0003] The water quality characteristics of lignite wastewater determine its complex hazards, but the ammonia nitrogen, phenolic compounds and aromatic compounds contained in the wastewater can be recycled due to their high concentrations, which can increase the economic value of the wastewater while reducing the load of subsequent treatment processes. Utility Model Content
[0004] The utility model aims to overcome the shortcomings of the prior art and provide a device for strengthening the recovery of coal tar in blue charcoal wastewater.
[0005] The utility model adopts the following technical solutions:
[0006] A device for enhanced recovery of coal tar from blue carbon wastewater, comprising an oil separator, a primary filter, an oxidation device, a secondary filter, a circulation device, a coal tar storage tank and a wastewater collection tank.
[0007] The oil separator tank processes the incoming semi-coke wastewater, including a heavy oil discharge port at the bottom and a light oil outlet at the top;
[0008] The primary filter is connected to the heavy oil discharge port and the coal tar storage tank respectively, performs primary filtration on the incoming semi-coke wastewater, and discharges the separated suspended oil droplets and coal powder into the coal tar storage tank;
[0009] The oxidation device is connected to the primary filter to further oxidize the unoxidized substances in the incoming blue carbon wastewater to form agglomerated oils;
[0010] The secondary filter is connected to the oxidation device, the coal tar storage tank and the wastewater collection tank respectively, separates the oil produced in the incoming blue carbon wastewater and discharges it into the coal tar storage tank, and the effluent enters the wastewater collection tank for subsequent biological treatment;
[0011] The circulation device is arranged between the secondary filter and the oxidation device, and comprises a circulation return water pipe connected between the secondary filter and the oxidation device and a regulating valve arranged on the circulation return water pipe.
[0012] Furthermore, the oxidation device is an electrocatalytic device.
[0013] Furthermore, it also includes a cleaning device for cleaning the oxidation device, and the cleaning device includes a hot air pipe connected to the oxidation device and an oil drain pipe connected between the oxidation device and the coal tar storage tank.
[0014] Furthermore, the temperature of the hot air in the hot air pipe is 100-150°C.
[0015] Furthermore, the first-stage filter adopts a ceramic filter with a particle size of 2-8um.
[0016] Furthermore, the secondary filter adopts a bag filter with a filtration accuracy of 10-20um.
[0017] Furthermore, the circulation volume on the circulation return pipe is 50-80% of the water inlet volume of the oxidation device.
[0018] Furthermore, the standing time of the semi-coke wastewater in the oil separator is 36-72 hours.
[0019] Furthermore, it also includes a light oil recovery tank connected to the light oil outlet of the oil separator tank.
[0020] From the above description of the utility model, it can be seen that compared with the prior art, the beneficial effects of the utility model are as follows: the present application specifically defines the structure of the recovery device, and through the mutual cooperation between the oil separator, the primary filter, the oxidation device, the secondary filter and the circulation device, the content of various oils and fine dust in the lignite wastewater is efficiently removed, the risk of pollution blockage in the subsequent phenol-ammonia recovery process is reduced, and the efficient operation of the lignite wastewater entering the subsequent phenol-ammonia recovery process is ensured. The overall structure is simple, the operation is convenient, the operation is stable, and the operation cost is low; and the cost of reagents can be reduced without adding chemical substances, changing the basic physical properties of coal tar, and changing the basic properties of wastewater, so as to facilitate the subsequent recovery of ammonia nitrogen and coarse powder; wherein, the cooperation of the oxidation device, the secondary filtration device and the circulation device can convert a large amount of unoxidized substances into coal tar, increase economic value, and reduce the subsequent COD load. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the structure of the utility model;
[0022] In the figure, 1-oil separator, 2-primary filter, 3-oxidation device, 4-secondary filter, 5-circulation device, 6-coal tar storage tank, 7-wastewater collection tank, 8-cleaning device, 9-light oil recovery tank, 51-circulation return pipe, 52-regulating valve, 81-hot air pipe, 82-oil drain pipe. DETAILED DESCRIPTION
[0023] The present invention is further described below through specific implementation methods.
[0024] Reference Figure 1 As shown, a device for enhanced recovery of coal tar from lignite wastewater includes an oil separator 1, a primary filter 2, an oxidation device 3, a secondary filter 4, a circulation device 5, a coal tar storage tank 6, a wastewater collection tank 7, a cleaning device 8 and a light oil recovery tank 9.
[0025] The oil-water separator 1 processes the incoming lignite wastewater, including a heavy oil discharge port at its bottom and a light oil outlet at its top, wherein the light oil recovery tank 9 is connected to the light oil outlet. When the lignite wastewater enters the oil-water separator 1 for treatment, the oil droplets float to the water surface to form an oil layer through the action of the swirl zone and the honeycomb inclined tubes in the sedimentation zone provided inside the oil-water separator 1, and then are recovered into the light oil recovery tank 9 through the oil collection pipe and the light oil outlet, thereby realizing the preliminary recovery of the light oil. Specifically, when the oil-water separator 1 is working, the incoming lignite wastewater is allowed to stand inside it for 36-72 hours through the control of the pump and the valve.
[0026] The primary filter 2 is connected to the heavy oil discharge port and the coal tar storage tank 6 respectively, performs primary filtration on the incoming lignite wastewater, and discharges the separated suspended oil droplets and coal powder into the coal tar storage tank 6. Specifically, the primary filter 2 adopts a ceramic filter with a particle size of 2-8um.
[0027] The oxidation device 3 is connected to the primary filter 2 to further oxidize the unoxidized substances in the incoming lignite wastewater to form agglomerated oils. Specifically, the oxidation device 3 adopts an electrocatalytic device, which is provided with a power supply and an electrolytic cell, wherein the electrode material is one of graphite, titanium, and alloy inert materials. When working, two sets of oxidation devices 3 can be set and used alternately to ensure the stable progress of the lignite wastewater treatment process.
[0028] The secondary filter 4 is respectively connected to the oxidation device 3, the coal tar storage tank 6 and the wastewater collection tank 7 to separate the oil produced in the incoming lignite wastewater and discharge it into the coal tar storage tank 6. The effluent enters the wastewater collection tank 7 for subsequent biological treatment. Specifically, the secondary filter 4 adopts a bag filter with a filtration accuracy of 10-20um.
[0029] The circulation device 5 is arranged between the secondary filter 4 and the oxidation device 3, and includes a circulation return pipe 51 connected between the secondary filter 4 and the oxidation device 3 and a regulating valve 52 arranged on the circulation return pipe 51. When working, the circulation amount on the circulation return pipe 51 is controlled by the regulating valve 52 to be 50-80% of the water inlet amount of the oxidation device 3 to ensure that most of the easily oxidizable substances are converted into coal tar substances.
[0030] The cleaning device 8 is used to clean the oxidation device 3, and includes a hot air pipe 81 connected to the oxidation device 3 and an oil drain pipe 82 connected between the oxidation device 3 and the coal tar storage tank 6, wherein the temperature of the hot air in the hot air pipe 81 is 100-150°C, and hot air is introduced into the oxidation device 3 through the hot air pipe 81 to blow off the electrode plates, so that the coal tar adhering to the electrode plates is blown off and discharged into the coal tar storage tank 6 through the oil drain pipe 82; when working, the hot air in the hot air pipe 81 can also be sent to the secondary filter 4, and the replaced filter bag is blown off with hot air, so that the coal tar recovered on the filter bag can slide off without damaging the primary filter layer formed on the filter bag, thereby maintaining the working capacity of the secondary filter 4.
[0031] The present application specifically defines the structure of the recovery device. Through the mutual cooperation among the oil separator 1, the primary filter 2, the oxidation device 3, the secondary filter 4 and the circulation device 5, the contents of various oils and fine dust in the lignite wastewater are efficiently removed, the risk of pollution and blockage in the subsequent phenol-ammonia recovery process is reduced, and the efficient operation of the lignite wastewater entering the subsequent phenol-ammonia recovery process is ensured. The overall structure is simple, the operation is convenient, the operation is stable, and the operation cost is low; and the cost of reagents can be reduced without adding chemical substances, changing the basic physical properties of coal tar, and changing the basic properties of wastewater, so as to facilitate the subsequent recovery of ammonia nitrogen and coarse powder; wherein, the cooperation between the oxidation device 3, the secondary filter device 4 and the circulation device 5 can convert a large amount of unoxidized substances into coal tar, increase the economic value, and reduce the subsequent COD load.
[0032] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of application of the present invention and the contents of the specification should still fall within the scope covered by the present invention.
Claims
1. A device for enhanced recovery of coal tar from blue carbon wastewater, characterized in that: It includes oil separator, primary filter, oxidation device, secondary filter, circulation device, coal tar storage tank and wastewater collection tank. The oil separator tank processes the incoming semi-coke wastewater, including a heavy oil discharge port at the bottom and a light oil outlet at the top; The primary filter is connected to the heavy oil discharge port and the coal tar storage tank respectively, performs primary filtration on the incoming semi-coke wastewater, and discharges the separated suspended oil droplets and coal powder into the coal tar storage tank; The oxidation device is connected to the primary filter to further oxidize the unoxidized substances in the incoming blue carbon wastewater to form agglomerated oils; The secondary filter is connected to the oxidation device, the coal tar storage tank and the wastewater collection tank respectively, separates the oil produced in the incoming blue carbon wastewater and discharges it into the coal tar storage tank, and the effluent enters the wastewater collection tank for subsequent biological treatment; The circulation device is arranged between the secondary filter and the oxidation device, and comprises a circulation return water pipe connected between the secondary filter and the oxidation device and a regulating valve arranged on the circulation return water pipe.
2. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: The oxidation device is an electrocatalytic device.
3. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 2, characterized in that: It also includes a cleaning device for cleaning the oxidation device, wherein the cleaning device includes a hot air pipe connected to the oxidation device and an oil drain pipe connected between the oxidation device and the coal tar storage tank.
4. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 3, characterized in that: The temperature of the hot air in the hot air pipe is 100-150°C.
5. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: The primary filter is a ceramic filter with a particle size of 2-8 um.
6. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: The secondary filter adopts a bag filter with a filtering accuracy of 10-20um.
7. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: The circulation volume on the circulating water return pipe is 50-80% of the water inlet volume of the oxidation device.
8. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: The standing time of the semi-coke wastewater in the oil separator is 36-72h.
9. The device for enhanced recovery of coal tar from blue carbon wastewater according to claim 1, characterized in that: It also includes a light oil recovery tank connected to the light oil outlet of the oil separator tank.