Deep catalytic oxidation tempering pretreatment system for coking distilled ammonia wastewater

Abstract

The utility model belongs to the field of water treatment, and provides a coking ammonia distillation wastewater deep catalytic oxidation tempering pretreatment system which comprises a regulating tank, a sand filter device, a catalytic oxidation reaction tower and a sedimentation tank, the adjusting tank, the sand filtering device, the catalytic oxidation reaction tower and the inclined plate tube sedimentation tank are connected in sequence; a suspended vertical flow reaction tube is arranged in the catalytic oxidation reaction tower, the diameter of the top of the suspended vertical flow reaction tube is increased, and a flow guide baffle and a catalyst are arranged in the suspended vertical flow reaction tube; a mist catcher and a tail gas outlet are arranged at the top of the catalytic oxidation reaction tower; a gas-water mixing buffer area, a raw water inlet and an aeration pipe are arranged at the bottom of the catalytic oxidation reaction tower; a raw water outlet is formed in the side wall of the upper part of the catalytic oxidation reaction tower. The pretreatment system disclosed by the utility model has high treatment efficiency on coking ammonia distillation wastewater, realizes cyclic utilization of tail gas, does not need to adopt dilution water, and is environment-friendly and efficient.

Description

Technical Field

[0001] The utility model belongs to the field of water treatment, and particularly relates to a deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater. Background Art

[0002] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and shall not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field.

[0003] Coking wastewater contains a variety of toxic and harmful organic substances such as volatile phenols, polycyclic aromatic hydrocarbons, oxygen, sulfur, and nitrogen heterocyclic compounds. It has high biological toxicity, stable structure, and poor biodegradability. It is one of the most difficult types of organic wastewater to treat. At present, most coking plants use pre-treatment gravity oil removal, flotation oil removal, sewage conditioning, biological denitrification treatment, and post-coagulation treatment. However, there are problems such as low treatment efficiency and poor effect, low resource utilization, and the need for dilution water in pretreatment, which limits its further industrial application. There is an urgent need for a coking ammonia evaporation wastewater pretreatment system with higher efficiency in treating coking wastewater. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater. The pretreatment system of the utility model has high treatment efficiency for coking ammonia evaporation wastewater, realizes the recycling of tail gas, does not need to use dilution water, and is environmentally friendly and efficient.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The first aspect of the utility model provides a deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater, comprising: a regulating tank, a sand filter device, a catalytic oxidation reaction tower, and a sedimentation tank; the regulating tank, the sand filter device, the catalytic oxidation reaction tower, and the inclined plate tube sedimentation tank are connected in sequence;

[0007] The catalytic oxidation reaction tower is provided with a suspended vertical flow reaction tube, the diameter of the top of the suspended vertical flow reaction tube becomes larger, and a guide baffle and a catalyst are provided in the suspended vertical flow reaction tube; a mist collector and an exhaust gas outlet are provided at the top of the catalytic oxidation reaction tower; an air-water mixing buffer zone, a raw water inlet and an aeration pipe are provided at the bottom of the catalytic oxidation reaction tower; and a raw water outlet is provided on the side wall of the upper part of the catalytic oxidation reaction tower.

[0008] In some embodiments, the catalytic oxidation reaction tower is provided with two sets, which are operated in parallel to achieve load distribution, which can not only improve the overall catalytic oxidation efficiency, but also enable inspection and maintenance under the premise that low load does not affect the operation.

[0009] In some embodiments, the raw water inlet is connected to a water distribution pipe and a liquid delivery pump in sequence.

[0010] In some embodiments, the aeration tube is disposed in an air-water mixing buffer zone.

[0011] In some embodiments, the aeration tube is connected to an ozone generator.

[0012] In some embodiments, the tail gas outlet is connected to a gas delivery blower and an ozone generator in sequence.

[0013] In some embodiments, a flow meter is further provided between the aeration pipe and the ozone generator.

[0014] In some embodiments, the air inlet of the ozone generator is connected to an oxygen storage tank.

[0015] In some embodiments, a backwash water inlet is further provided on the lower side wall of the catalytic oxidation reaction tower, and a backwash water outlet is provided on the upper side wall of the catalytic oxidation reaction tower.

[0016] In some embodiments, a raw water circulation pipeline is further provided in the catalytic oxidation reaction tower, and a forced circulation pump is provided on the raw water circulation pipeline.

[0017] Beneficial effects of the utility model

[0018] (1) The pretreatment system of the utility model has high efficiency in treating coking ammonia evaporation wastewater, realizes the recycling of tail gas, and does not require the use of dilution water, which is environmentally friendly and efficient.

[0019] (2) The utility model provides a suspended vertical flow reaction tube in the catalytic oxidation reaction tower. The catalyst enters the suspended vertical flow reaction tube from the top through the catalyst feed pipe. The catalyst is carried to the top of the suspended vertical flow reaction tube by the upward high-speed water flow. The diameter of the top of the suspended vertical flow reaction tube becomes larger, and the water flow speed slows down. The catalyst falls back into the suspended vertical flow reaction tube and is carried to the top of the suspended vertical flow reaction tube again by the high-speed water flow. The catalyst reciprocates multiple times to form a forced circulation, which can ensure that the catalyst is always in the suspended vertical flow reaction tube to prevent sinking to the bottom and always maintains full contact with water, thereby increasing the residence time of the raw water in the catalytic oxidation reaction tower by 30-60 minutes, thereby improving the catalyst utilization rate and the degradation efficiency of organic pollutants.

[0020] (3) In the present invention, the tail gas is re-introduced into the ozone generation system through a mist collector arranged at the top of the catalytic oxidation reaction tower and a gas delivery fan, thereby forming a closed-loop system and realizing efficient dissolution and closed-loop utilization of ozone.

[0021] (4) The system of the utility model has a simple structure, is easy to operate, has strong practicality, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 The utility model is a schematic structural diagram of a deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater, wherein 1 is a regulating tank, 2 is a sand filter device, 3 is a catalytic oxidation reaction tower, 4 is an inclined plate tube sedimentation tank, 5 is a suspended vertical flow reaction tube, 6 is a guide baffle, 7 is a catalyst, 8 is a mist collector, 9 is an O3 tail gas outlet, 10 is a gas-water mixing buffer zone, 11 is a catalyst feed port, 12 is an aeration pipe, 13 is a water distribution pipe, 14 is a flow meter, 15 is a raw water outlet, 16 is a backwash water inlet, 17 is a backwash water outlet, 18 is a raw water circulation inlet, 19 is a raw water circulation outlet, 20 is a forced circulation pump, 21 is a liquid delivery pump, 22 is a gas delivery fan, 23 is an ozone generator, and 24 is an oxygen storage tank. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] Terminology explanation:

[0026] "Coking ammonia evaporation wastewater" is a type of coking wastewater treatment, mainly containing ammonia nitrogen organic pollutants.

[0027] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0028] like Figure 1 As shown, the utility model provides a deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater, comprising: a regulating tank 1, a sand filter device 2, a catalytic oxidation reaction tower 3, and a sedimentation tank; the regulating tank 1, the sand filter device 2, the catalytic oxidation reaction tower 3, and the inclined plate tube sedimentation tank 4 are connected in sequence;

[0029] The catalytic oxidation reaction tower 3 is provided with a suspended vertical flow reaction tube 5, the diameter of the top of the suspended vertical flow reaction tube 5 becomes larger, and a guide baffle 6 and a catalyst 7 are provided in the suspended vertical flow reaction tube 5; a mist collector 8 and an exhaust gas outlet 9 are provided at the top of the catalytic oxidation reaction tower; a gas-water mixing buffer zone 10, a raw water inlet and an aeration pipe 12 are provided at the bottom of the catalytic oxidation reaction tower; a raw water outlet 15 is provided on the side wall of the upper part of the catalytic oxidation reaction tower.

[0030] Here’s how to run it:

[0031] 1. Main process units: raw water from secondary flotation--regulating tank 1--sand filter device 2--catalytic oxidation reaction tower 3--inclined plate tube sedimentation tank 4--effluent to biochemical system

[0032] 2. The regulating tank 1 ensures that the water quality and water volume entering the catalytic oxidation reaction tower 3 remain stable when there are large fluctuations in the production process, thereby improving the stability of operation. The pH is adjusted to 9-11 by adding a small amount of liquid alkali, and a small amount of demulsifier, PAC, PAM, etc. are added to further remove the residual oil and suspended matter in the wastewater. The solid suspended matter concentration SS ≤ 50 mg / L is removed by the sand filter device 2.

[0033] 3. A suspended vertical flow reaction tube 5 is provided in the catalytic oxidation reaction tower. The catalyst 7 enters the suspended vertical flow reaction tube 5 from the top through the catalyst feed port 11. The catalyst 7 is carried to the top of the suspended vertical flow reaction tube 5 by the upward high-speed water flow. The diameter of the top of the suspended vertical flow reaction tube 5 becomes larger, and the water flow speed slows down. The catalyst 7 falls back into the suspended vertical flow reaction tube 5 and is carried to the top of the suspended vertical flow reaction tube 5 again by the high-speed water flow. It reciprocates multiple times to form a forced circulation, which can ensure that the catalyst 7 is always in the suspended vertical flow reaction tube 5 to prevent sinking, and always maintains full contact with water, thereby increasing the residence time of the raw water in the catalytic oxidation reaction tower 3 by 30-60 minutes, thereby improving the utilization rate of the catalyst 7 and the degradation efficiency of organic pollutants.

[0034] 4. Ozone tail gas recovery device, the tail gas passes through the mist collector 8 arranged on the top of the catalytic oxidation reaction tower, and is re-introduced into the ozone generation system through the gas conveying fan 22 to form a closed-loop system to achieve efficient dissolution closed-loop utilization of ozone.

[0035] 5. Catalyst 7 can adopt a patented product (application number CN202210191791.5, an ozone catalyst 7 with acetate as a precursor and its preparation method and application), which has the following characteristics: high efficiency in removing pollutants and high versatility, and the particle size of catalyst 7 is 3-6 mm.

[0036] 6. Inclined plate tube sedimentation tank 4, to precipitate suspended matter and particulate matter in the raw water. The sedimentation time of inclined plate tube sedimentation tank 4 is 2-6 hours, preferably 3-5 hours. A water supply pipe is provided on the top of inclined plate tube sedimentation tank 4 to ensure uniform water distribution, improve sedimentation efficiency, ensure pretreatment effect and reduce the burden of entering biochemical treatment.

[0037] It should be noted that various devices, components and parts in the present invention can be commercially available products, and the connection relationship and arrangement method between various devices can be set up using common methods in the industry. For example, various devices are connected through pipelines to realize the flow of gas and liquid in the pretreatment system of the present invention, or, corresponding raw water circulation inlet 18, raw water circulation outlet 19, backwash water inlet 16, backwash water outlet 17 are set in the catalytic oxidation reaction tower 3, and the raw water circulation inlet 18 and raw water circulation outlet 19 are connected through pipelines, etc. This application does not make any special limitations on this, and technical personnel in this field can connect, install and use according to the conventional settings in the industry.

[0038] Furthermore, the catalytic oxidation reaction tower 3 is provided with two sets, which are operated in parallel to achieve load distribution, which can not only improve the overall catalytic oxidation efficiency, but also can be inspected and maintained under the premise that low load does not affect the operation.

[0039] Furthermore, the raw water inlet is connected to the water distribution pipe 13 and the liquid delivery pump 21 in sequence, so that the raw water filtered by the sand filter device 2 is introduced into the catalytic oxidation reaction tower 3 through the liquid delivery pump 21, and then distributed through the water distributor.

[0040] Furthermore, the aeration pipe 12 is disposed in the air-water mixing buffer zone 10 so that the ozone can be fully mixed with the raw water sprayed from the water distributor, thereby improving the treatment effect on the raw water.

[0041] Furthermore, the aeration pipe 12 is connected to an ozone generator 23 , and ozone is generated by the ozone generator 23 and supplied to the aeration pipe 12 for use.

[0042] Furthermore, the tail gas outlet 9 is sequentially connected to the gas delivery fan 22 and the ozone generator 23. The tail gas passes through the mist collector 8 arranged at the top of the catalytic oxidation reaction tower, and then through the gas delivery fan 22, and is re-input into the ozone generation system to form a closed-loop system, thereby realizing the efficient dissolution closed-loop utilization of ozone.

[0043] Furthermore, a flow meter 14 is provided between the aeration pipe 12 and the ozone generator 23 to monitor the ozone flow in real time to ensure that the system operates normally.

[0044] Furthermore, the air inlet of the ozone generator 23 is connected to the oxygen storage tank 24 , and ozone is generated in the ozone generator 23 using oxygen as a raw material gas.

[0045] Furthermore, the lower side wall of the catalytic oxidation reaction tower is provided with a backwash water inlet 16 and the upper side wall of the catalytic oxidation reaction tower is provided with a backwash water outlet 17. The backwash water is used to remove suspended matter and pollutants deposited on the surface of the catalyst 7, thereby improving the catalytic efficiency of the catalyst 7.

[0046] Furthermore, a raw water circulation pipeline is provided in the catalytic oxidation reaction tower, and a forced circulation pump 20 is provided on the raw water circulation pipeline. By circulating the raw water, the utilization rate of the raw water is improved, and at the same time, the treatment effect of the pretreatment system on the raw water is further improved.

[0047] Furthermore, it is equipped with a PLC intelligent control system to realize automatic monitoring and regulation of parameters such as reaction temperature, pressure, gas flow, and exhaust emission indicators. It runs fully automatically and can realize intelligent operations such as remote monitoring, real-time adjustment, and system early warning to ensure stable reaction conditions and improve treatment effects.

[0048] More specifically, based on the use requirements of the preprocessing system of the utility model, a corresponding PLC intelligent control system can be purchased from a manufacturer.

[0049] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater, characterized in that: include: A regulating tank, a sand filter device, a catalytic oxidation reaction tower, and a sedimentation tank; the regulating tank, the sand filter device, the catalytic oxidation reaction tower, and the inclined plate tube sedimentation tank are connected in sequence; The catalytic oxidation reaction tower is provided with a suspended vertical flow reaction tube, the diameter of the top of the suspended vertical flow reaction tube becomes larger, and a guide baffle and a catalyst are provided in the suspended vertical flow reaction tube; a mist collector and an exhaust gas outlet are provided at the top of the catalytic oxidation reaction tower; an air-water mixing buffer zone, a raw water inlet and an aeration pipe are provided at the bottom of the catalytic oxidation reaction tower; and a raw water outlet is provided on the side wall of the upper part of the catalytic oxidation reaction tower.

2. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The catalytic oxidation reaction towers are provided with two sets, which are operated in parallel.

3. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The raw water inlet is connected with the water distribution pipe and the liquid delivery pump in sequence.

4. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The aeration pipe is arranged in the air-water mixing buffer zone.

5. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The aeration pipe is connected to an ozone generator.

6. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The tail gas outlet is connected with the gas delivery fan and the ozone generator in sequence.

7. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: A flow meter is also arranged between the aeration pipe and the ozone generator.

8. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 5, characterized in that: The air inlet of the ozone generator is connected to the oxygen storage tank.

9. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: The lower side wall of the catalytic oxidation reaction tower is also provided with a backwash water inlet, and the upper side wall of the catalytic oxidation reaction tower is provided with a backwash water outlet.

10. The deep catalytic oxidation conditioning pretreatment system for coking ammonia evaporation wastewater according to claim 1, characterized in that: A raw water circulation pipeline is also arranged in the catalytic oxidation reaction tower, and a forced circulation pump is arranged on the raw water circulation pipeline.

Images