MVR mother liquor treatment device in coal tar production
By designing the MVR mother liquor treatment device in coal tar production, the problem of accumulation of high boiling point organic matter in the MVR evaporation system is solved, and the quality of crystalline salts is guaranteed and energy-saving and efficiency-enhancing is achieved.
Patent Information
- Application Number
- CN202421823053.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-30
AI Technical Summary
During the coal tar production process, the accumulation of high boiling point organic matter in the MVR evaporation system causes the crystalline salt to turn reddish brown color, affecting the quality, and there are difficulties in handling MVR concentrates.
A MVR mother liquor treatment device in coal tar production is designed, including an MVR evaporation system, an oil separator, an oil degreasing tank, a negative pressure film evaporator and a waste gas treatment system. Through this device, the mother liquor is treated to realize oil, water layering and full drying treatment, ensuring the quality of crystalline salt.
The mother liquor generated by the MVR evaporation system is effectively treated to prevent the accumulation of high boiling point organic matter, ensure the quality of crystalline salt, achieve energy saving and efficiency enhancement, and meet the emission standards through the exhaust gas treatment system.
Smart Images
Figure CN222841520U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production equipment, and in particular relates to an MVR mother liquor processing device in coal tar production. Background Art
[0002] Coal tar is an organic mixture mainly composed of aromatic hydrocarbons. The wastewater discharged during the production process of deep processing of coal tar has a high concentration of pollutants and a relatively complex composition. In addition to petroleum, volatile phenols, and ammonia nitrogen, it also contains monocyclic or polycyclic aromatic compounds such as indole and quinoline, as well as heterocyclic organic pollutants containing nitrogen, sulfur, and oxygen. It is one of the more difficult wastewaters to treat; the current treatment method generally uses a water storage tank for temporary storage, followed by oil removal, MVR evaporation, iron-carbon micro-electrolysis, Fenton oxidation, and biochemical treatment; however, with the long-term operation of the MVR evaporation system, high-boiling-point organic matter in the wastewater gradually accumulates in the MVR evaporation system. When it reaches a certain level, the high-boiling-point organic matter will precipitate together with the crystallized salt, causing the color of the crystallized salt to change from the initial white to reddish brown, affecting the sale of the crystallized salt. In order to ensure the quality of the crystallized salt, the concentrated liquid that has been concentrated to a certain level needs to be regularly discharged from the MVR evaporation system during the operation of the MVR, so as to avoid excessive accumulation of high-boiling-point organic matter in the MVR evaporation system. The composition of MVR concentrate is complex, with high salt content (containing saturated sodium sulfate and a small amount of accumulated sodium chloride and other salts) and high organic matter content (the COD value of the wastewater is as high as tens of thousands), which is a major problem in wastewater treatment. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide an MVR mother liquor treatment device in coal tar production, which overcomes the defects of the prior art and can effectively treat the mother liquor produced by the MVR evaporation system, has a simple structure, good treatment effect, ensures the quality of recovered crystallized salt, and saves energy and increases efficiency.
[0004] In order to solve the above technical problems, the technical solution of the utility model is:
[0005] A MVR mother liquor treatment device in coal tar production comprises an MVR evaporation system, an oil separator, an oil removal tank, a negative pressure film evaporator and a waste gas treatment system which are sequentially connected through pipelines and pumps; the oil removal tank is provided with a floating oil outlet and a mother liquor outlet, the floating oil outlet is connected to the floating oil storage tank through a pipeline, and the mother liquor outlet is connected to the negative pressure film evaporator through a pipeline; the negative pressure film evaporator is provided with a steam outlet and a crystallized salt outlet, and the steam outlet is connected to the waste gas treatment system through a pipeline; the waste gas treatment system is provided with a waste gas outlet and a liquid outlet, the waste gas outlet is connected to an induced draft fan through a pipeline, the liquid outlet is connected to a temporary storage tank through a pipeline, and the temporary storage tank is connected to the MVR evaporation system through a pipeline.
[0006] Preferably, the mother liquor in the grease trap is transported to the oil removal tank by a pump, and the salt particles settled in the grease trap are regularly cleaned to a salt collection tank to wait for processing.
[0007] Preferably, the floating oil storage tank is connected to the oil-using device in the workshop through a pipeline and a pump, so as to realize the reuse of floating oil and save energy and reduce consumption.
[0008] Preferably, the model of the negative pressure thin film evaporator is XYMNPD-200, and the manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.
[0009] Preferably, the crystallized salt outlet of the negative pressure thin film evaporator is connected to a bagging system, so that the crystallized salt can be packed into bags and then sold out, thus increasing the efficiency.
[0010] Preferably, the exhaust gas treatment system comprises a pressure regulating box, an induced draft fan, an oxidation tower, an absorption tower, a chimney and other devices which are sequentially connected through pipelines and valves.
[0011] Preferably, the pipelines are all provided with steam heating and heat preservation devices, and are provided with steam purge ports, to prevent the mother liquor from cooling and crystallizing during transportation and clogging the pipelines.
[0012] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0013] The utility model first conveys the mother liquor generated by the MVR evaporation system to the existing grease trap for temporary storage, and after the salt particles in the mother liquor are settled, the mother liquor is conveyed to the oil removal tank together with the floating oil by a pump; the oil and water layers are separated in the oil removal tank, the upper floating oil is regularly discharged to the floating oil storage tank, and the lower mother liquor is sent to the negative pressure film evaporator for full drying treatment; the crystallized salt obtained by drying is collected and sold out for efficiency enhancement, the generated water vapor and odorous gas are treated by the exhaust gas treatment system, the qualified gas obtained by the treatment is discharged, and the liquid is collected and reused in the MVR evaporation system.
[0014] In conclusion, the utility model can effectively process the mother liquor generated by the MVR evaporation system, has a simple structure, good processing effect, ensures the quality of the recovered crystallized salt, and saves energy and increases efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the process of the utility model. DETAILED DESCRIPTION
[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0017] Embodiment 1:
[0018] like Figure 1As shown, an MVR mother liquor treatment device in coal tar production includes an MVR evaporation system, an oil separator, an oil removal tank, a negative pressure thin film evaporator, and a waste gas treatment system which are sequentially connected through pipelines and pumps; the oil removal tank is provided with a floating oil outlet and a mother liquor outlet, the floating oil outlet is connected to the floating oil storage tank through a pipeline, and the mother liquor outlet is connected to the negative pressure thin film evaporator through a pipeline; the negative pressure thin film evaporator is provided with a steam outlet and a crystallized salt outlet, and the steam outlet is connected to the waste gas treatment system through a pipeline; the waste gas treatment system is provided with a waste gas outlet and a liquid outlet, the waste gas outlet is connected to the induced draft fan through a pipeline, the liquid outlet is connected to the temporary storage tank through a pipeline, and the temporary storage tank is connected to the MVR evaporation system through a pipeline.
[0019] In actual production, according to the quality of the crystallized salt of the MVR system, the MVR mother liquor is regularly transported to the existing oil separator for temporary storage. After the salt particles in the mother liquor are settled (regularly cleaned to the salt settling collection tank and waiting for treatment), the mother liquor is pumped together with the floating oil to the oil removal tank; the oil and water are separated in the oil removal tank, the upper floating oil is regularly discharged to the floating oil storage tank (then the floating oil is recycled to the corresponding equipment in the workshop), and the lower mother liquor is transported to the negative pressure thin film evaporator for full drying treatment. The dried product is a crystallized salt with a moisture content of less than 10%, which is bagged and regularly taken away for treatment; the heat source used for drying is steam.
[0020] The odorous gas containing a large amount of water vapor generated during the drying process enters the exhaust gas treatment system for treatment under the action of the induced draft fan; the treated exhaust gas meets the emission standards and is discharged through the induced draft fan.
[0021] In order to prevent the concentrated liquid from cooling down and crystallizing during transportation, which may clog the pipeline, all pipelines transporting the mother liquor are equipped with steam heating and insulation devices, and steam purge ports so that the pipelines and corresponding devices in the system can be thoroughly cleaned when the system is shut down.
[0022] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.
Claims
1. A MVR mother liquor treatment device in coal tar production, characterized by: It includes an MVR evaporation system, an oil separator, an oil removal tank, a negative pressure thin film evaporator, and a waste gas treatment system which are sequentially connected through pipelines and pumps; the oil removal tank is provided with a floating oil outlet and a mother liquid outlet, the floating oil outlet is connected to the floating oil storage tank through a pipeline, and the mother liquid outlet is connected to the negative pressure thin film evaporator through a pipeline; the negative pressure thin film evaporator is provided with a steam outlet and a crystallized salt outlet, and the steam outlet is connected to the waste gas treatment system through a pipeline; the waste gas treatment system is provided with a waste gas outlet and a liquid outlet, the waste gas outlet is connected to the induced draft fan through a pipeline, the liquid outlet is connected to the temporary storage tank through a pipeline, and the temporary storage tank is connected to the MVR evaporation system through a pipeline.
2. The MVR mother liquor treatment device in coal tar production according to claim 1, characterized in that: The mother liquid in the grease trap is transported to the oil removal tank by a pump.
3. The MVR mother liquor treatment device in coal tar production according to claim 1, characterized in that: The floating oil storage tank is connected to the workshop oil-using device through a pipeline and a pump.
4. The MVR mother liquor treatment device in coal tar production according to claim 1, characterized in that: The crystallized salt outlet of the negative pressure thin film evaporator is connected to the bagging system.
5. The MVR mother liquor treatment device in coal tar production according to claim 1, characterized in that: The waste gas treatment system comprises a pressure regulating box, an induced draft fan, an oxidation tower, an absorption tower and a chimney which are sequentially connected through pipelines and valves.
6. The MVR mother liquor treatment device in coal tar production according to claim 1, characterized in that: The pipelines are all provided with steam heating and heat preservation devices, and are provided with steam purge ports.