Comprehensive treatment system for volatile organic compounds in coking plant
By designing a combination system of scrubbers and burners in a coking plant, first wash, then adsorb and then burn, and using high-temperature flue gas to desorb adsorbent, the problems of low processing efficiency and high energy consumption in the existing technology are solved, and the problem of low processing efficiency and high energy consumption is achieved. Efficient and environmentally friendly volatile organic compounds treatment.
Patent Information
- Application Number
- CN202421355525.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-06-14
AI Technical Summary
The treatment efficiency of volatile organic compounds treatment devices in coking plants is low, and the adsorbent desorption process requires shutdown and high temperature heating, resulting in large energy consumption and increased production costs, which cannot meet emission standards and affects the environment and health.
A comprehensive treatment system including a scrubber and a burner is designed. Through the combination of scrubber and adsorbent, it is washed first and then adsorbed, and then burned. The high-temperature flue gas is used to desorb the adsorbent online to achieve the waste gas Thoroughly purify.
It improves the treatment efficiency of volatile organic compounds, meets emission standards, reduces environmental pollution, realizes online desorption of adsorbents and energy saving, avoids downtime operations, and reduces production costs.
Smart Images
Figure CN222173640U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of volatile organic matter treatment, in particular to a comprehensive treatment system for volatile organic matter in a coking plant. Background Art
[0002] Volatile organic compounds, commonly referred to as VOCs, refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260℃ at normal pressure, or all organic compounds with corresponding volatility and a vapor pressure greater than or equal to 10Pa at 20℃. They are organic compounds that exist in the air in gaseous form at room temperature. When the concentration of volatile organic compounds in a room exceeds a certain concentration, people will feel headaches, nausea, vomiting, and weakness in their limbs in a short period of time. In severe cases, they will experience convulsions, coma, and memory loss, and will damage the liver, kidneys, brain, and nervous system.
[0003] At present, during the production process of coking plants, VOCs are generated in cold drums, desulfurization, ammonium sulfate, crude benzene, oil depots, biochemical sewage stations, quenching pools and other areas, resulting in poor atmospheric environment around the enterprise, excessive pollutant emissions, serious impact on the health of workers, and certain safety hazards. Although VOCs treatment devices are now installed in enterprises, most of these devices still have the problem of low treatment efficiency, and the VOCs content in the gas discharged after treatment is still high, which cannot meet the prescribed emission standards and VOCs treatment requirements, and will still cause pollution to the surrounding environment; in addition, when using adsorption to adsorb VOCs gas, it is necessary to regularly desorb the adsorbent to prevent the adsorption capacity of the adsorbent from being lost after the adsorption amount reaches saturation, but the desorption and regeneration of the adsorbent requires shutdown, which is time-consuming and labor-intensive, affecting the normal operation of the VOCs gas treatment system, and the desorption process often requires high-temperature heating of the adsorbent, which consumes more energy and increases the production cost of the enterprise. Therefore, it is an objective need to develop a comprehensive treatment system for volatile organic compounds in coking plants that has good treatment effect, can realize online desorption of adsorbents, and is environmentally friendly and energy-saving. Utility Model Content
[0004] The utility model aims to provide a comprehensive treatment system for volatile organic matter in a coking plant which has good treatment effect, can realize online desorption of adsorbent, and is environmentally friendly and energy-saving.
[0005] The purpose of the utility model is achieved in this way, including a connected scrubber and a burner, the interior of the scrubber is divided into a plurality of scrubbing chambers with the same structure by a vertical plate, a scrubbing device is arranged in the scrubbing chamber, a gas outlet of a previous scrubbing chamber is connected to a gas inlet of a subsequent scrubbing chamber through a pipeline, a gas outlet of the last scrubbing chamber is connected to an adsorber through a pipeline, the adsorber is divided into an adsorption chamber and a regeneration chamber by a horizontal plate, a mesh cone hopper is arranged in the adsorption chamber, the adsorption chamber on the cone hopper is filled with adsorbent, the bottom of the cone hopper is connected to the horizontal plate through a discharge pipe, a valve is arranged on the discharge pipe, a plurality of baffles are arranged obliquely and staggeredly at upper and lower intervals in the regeneration chamber, a screw conveyor is vertically arranged on one side of the adsorber, the lower end of the screw conveyor is connected to the bottom of the regeneration chamber, the upper end is connected to the top of the adsorption chamber, the bottom of the adsorption chamber and the top of the regeneration chamber are respectively connected to the inlet of the burner through a pipeline, the flue gas outlet of the burner is connected to an air-to-air heat exchanger, and the hot gas outlet of the air-to-air heat exchanger is connected to the bottom of the regeneration chamber.
[0006] Furthermore, the washing device includes a spiral coil and a central tube concentrically arranged at the lower part of the washing chamber, the inlet and outlet of the spiral coil are connected to the central tube, a number of spray holes are processed on the spiral tube and the central tube, the lower end of the central tube is connected to the air inlet pipe, and the washing chamber above the spiral coil is provided with fillers and nozzles from bottom to top, the top of the previous washing chamber is connected to the lower end of the central tube in the next washing chamber, and the top of the last washing chamber is connected to the top of the adsorption chamber through a pipeline.
[0007] Furthermore, the spiral coil is in a cone shape with a smaller diameter at the upper end and a larger diameter at the lower end.
[0008] Furthermore, a filter is provided on the air inlet pipe at the air inlet end of the scrubber.
[0009] Furthermore, a dehumidifier is provided at the top of each washing chamber.
[0010] Furthermore, a liquid discharge port is provided at the bottom of each washing chamber, and the liquid discharge port is connected to the liquid inlet of the washing device through a circulation pipe, and a water pump is provided on the circulation pipe.
[0011] When the utility model is in operation, an appropriate amount of water, washing oil, acid solution, alkali solution or other washing liquid is first filled into each washing chamber, and the volatile organic matter of the coking plant is washed with these washing liquids through the washing device to remove dust, ammonia, benzene, hydrogen sulfide and other substances in the volatile organic matter, and most of the VOCs components in the waste gas. The washed waste gas is then passed into an adsorber, and the remaining VOCs components in the waste gas are adsorbed by an adsorbent. The tail gas after the adsorption treatment is passed into a burner for combustion treatment, thereby meeting the emission requirements and solving the VOCs pollution problem. In the present invention, the exhaust gas is firstly washed with various kinds of washing liquids to remove most of the VOCs components in the exhaust gas, and then introduced into the adsorber to adsorb the remaining VOCs components in the exhaust gas, and finally burned. The whole treatment process is highly efficient and has a good treatment effect. The VOCs components in the exhaust gas can be removed more thoroughly, so that the exhaust gas can meet the emission standards when discharged, and can meet the VOCs treatment requirements, reducing or even avoiding the pollution of the surrounding environment; secondly, when the adsorber has been running for a period of time and the adsorbent needs to be regenerated and replaced, the high-temperature flue gas discharged from the burner is introduced into the air-to-air heat exchanger, and the waste heat of the flue gas is used to heat the cold air to obtain hot air with a higher temperature, and then the hot air is introduced into the bottom of the regeneration chamber, and the valve is opened at the same time, and the adsorbent falls into the regeneration chamber through the discharge pipe, and falls first To the top baffle, then roll down along the baffle, fall onto the next baffle, and so on, falling continuously, and in the process of falling, it contacts with the hot air in the opposite direction, so that the adsorbent can be more thoroughly desorbed and regenerated in the process of rolling and falling, and obtain a satisfactory regeneration effect. Finally, the adsorbent falls to the bottom of the regeneration chamber, enters the screw conveyor for upward transportation, and returns to the adsorption chamber, while the hot air carrying the desorbed VOCs enters the burner through the pipeline for combustion. The VOCs are burned into carbon dioxide and water vapor, and are discharged after the harmful substances are eliminated, which will not cause pollution to the environment. The whole process can be operated automatically without stopping, and will not affect the normal operation of the VOCs gas treatment system. The energy consumed when the adsorbent is desorbed is generated by the combustion of the exhaust gas itself, and no additional energy is consumed, nor will the production cost of the enterprise be increased. In summary, the utility model has the advantages of good treatment effect, online desorption of adsorbents, environmental protection and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 It is a left-side structural schematic diagram of the washing chamber 3 in the utility model;
[0014] In the figure: 1-scrubber, 2-burner, 3-scrubbing chamber, 4-adsorber, 5-adsorption chamber, 6-regeneration chamber, 7-adsorbent, 8-baffle, 9-screw conveyor, 10-gas-gas heat exchanger, 11-spiral coil, 12-center tube, 13-filler, 14-nozzle, 15-filter, 16-dehumidifier, 17-circulation tube. DETAILED DESCRIPTION
[0015] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the present invention belong to the protection scope of the present invention.
[0016] like Figures 1-2 As shown, the utility model comprises a connected scrubber 1 and a burner 2. The burner 2 is an existing device used for burning various combustible gases. The interior of the scrubber 1 is divided into a plurality of scrubbing chambers 3 of the same structure by a vertical plate. A scrubbing device is provided in the scrubbing chamber 3. The scrubbing device is an existing technology. The scrubbing operation is performed on the exhaust gas in the scrubbing chamber 3. The scrubbing device is generally a spray type structure, and can also be other structural forms. The gas outlet of the previous scrubbing chamber 3 is connected to the gas inlet of the next scrubbing chamber 3 through a pipeline, and the gas outlet of the last scrubbing chamber 3 is connected to the gas outlet of the next scrubbing chamber 3. The outlet is connected to an adsorber 4 through a pipeline. The adsorber 4 is divided into an adsorption chamber 5 and a regeneration chamber 6 by a transverse plate. A mesh cone bucket is provided in the adsorption chamber 5. A through hole is provided on the cone bucket. After the exhaust gas is adsorbed by the adsorbent 7, it is ejected through the through hole on the cone bucket and then discharged from the bottom of the adsorption chamber 5. The adsorption chamber 5 on the cone bucket is filled with an adsorbent 7. The adsorbent 7 is an existing structure and can be coke, activated carbon or zeolite, etc., or other adsorption materials with good adsorption capacity can be selected. The bottom of the cone bucket is connected to the transverse plate through a feed pipe, and a through hole is provided on the feed pipe. A valve is provided, and a plurality of baffles 8 are arranged in an inclined and staggered manner at intervals in the upper and lower parts of the regeneration chamber 6. The baffles 8 are of an existing structure, and their arrangement method is similar to that in the heat exchanger. The lower end is suspended, and a gap is left between the lower end and the side wall of the regeneration chamber 6. However, the baffles 8 in the utility model are arranged obliquely to prevent the adsorbent 7 from accumulating on the baffles 8 and facilitate the adsorbent 7 to slide down from the baffles 8. A screw conveyor 9 is vertically arranged on one side of the adsorber 4, and the lower end of the screw conveyor 9 is connected to the bottom of the regeneration chamber 6. The upper end is connected with the top of the adsorption chamber 5, the bottom of the adsorption chamber 5 and the top of the regeneration chamber 6 are connected with the inlet of the burner 2 through pipelines respectively, the flue gas outlet of the burner 2 is connected with the air-to-air heat exchanger 10, the hot gas outlet of the air-to-air heat exchanger 10 is connected with the bottom of the regeneration chamber 6, the air-to-air heat exchanger 10 is an existing heat exchange equipment, and is used for heat exchange between flue gas and cold air in the utility model. The high-temperature flue gas discharged from the burner 2 is used to heat the cold air, and then the heated hot air is used to realize the desorption and regeneration treatment of the adsorbent 7.
[0017] When the utility model is in operation, an appropriate amount of water, washing oil, acid solution or alkali solution and other washing liquids are first filled into each washing chamber 3, and the volatile organic matter of the coking plant is washed with these washing liquids through the washing device to remove dust, ammonia, benzene, hydrogen sulfide and other substances in the volatile organic matter, and most of the VOCs components in the waste gas are removed, and then the washed waste gas is passed into the adsorber 4, and the remaining VOCs components in the waste gas are adsorbed by the adsorbent 7, and the tail gas after the adsorption treatment is passed into the burner 2 for combustion treatment, so as to meet the emission requirements and solve the pollution problem of VOCs. In the present invention, the exhaust gas is firstly washed with various kinds of washing liquids to remove most of the VOCs components in the exhaust gas, and then introduced into the adsorber 4 to adsorb the remaining VOCs components in the exhaust gas, and finally burned. By combining a variety of treatment methods, the VOCs components in the exhaust gas can be removed more thoroughly, and the efficiency of the entire treatment process is high, and the treatment effect is good, so that the exhaust gas can meet the emission standards when discharged, and can meet the VOCs treatment requirements, reduce or even avoid the pollution of the surrounding environment; secondly, when the adsorber 4 runs for a period of time and the adsorbent 7 needs to be regenerated and replaced, the high-temperature flue gas discharged from the burner 2 is introduced into the air-to-air heat exchanger 10, and the waste heat of the flue gas is used to heat the cold air to obtain hot air with a higher temperature, and then the hot air is introduced into the bottom of the regeneration chamber 6, and the valve is opened at the same time, and the adsorbent 7 falls into the regeneration chamber through the discharge pipe. The adsorbent 7 first falls onto the top baffle 8, then rolls downward along the baffle 8 and falls onto the next baffle 8, and so on, falling continuously and in reverse contact with the hot air during the falling process, so that the adsorbent 7 can be more thoroughly desorbed and regenerated in the process of rolling and falling, and a satisfactory regeneration effect is obtained. Finally, the adsorbent 7 falls to the bottom of the regeneration chamber 6, enters the screw conveyor 9 for upward transportation, and returns to the adsorption chamber 5. The hot air carrying the desorbed VOCs enters the burner 2 through the pipeline for combustion. The VOCs are burned into carbon dioxide and water vapor, and are discharged after the harmful substances are eliminated, without causing pollution to the environment. The whole process can be operated automatically without shutdown, and will not affect the normal operation of the VOCs gas treatment system. The energy consumed when the adsorbent 7 is desorbed is generated by the combustion of the exhaust gas itself, without additional energy consumption and without increasing the production cost of the enterprise.
[0018] The washing device includes a spiral coil 11 and a central tube 12 which are concentrically arranged at the lower part of the washing chamber 3. The central tube 12 is arranged vertically. The inlet and outlet of the spiral coil 11 are both connected to the central tube 12. A plurality of spray holes are processed on the spiral coil 11 and the central tube 12. The lower end of the central tube 12 is connected to an air inlet pipe. Fillers 13 and nozzles 14 are arranged in sequence from bottom to top in the washing chamber 3 above the spiral coil 11. The top of the previous washing chamber 3 is connected to the lower end of the central tube 12 in the next washing chamber 3. The top of the last washing chamber 3 is connected to the top of the adsorption chamber 5 through a pipeline. During actual use, the exhaust gas is sprayed out from the spray holes on the spiral coil 11 and the central tube 12 respectively, which can increase the contact area between the exhaust gas and the washing liquid and improve the washing effect of the exhaust gas. In the utility model, the exhaust gas is first passed into the washing liquid for washing, and then enters the pores in the filler 13 to continue to contact with the washing liquid, and finally contacts with the washing liquid droplets sprayed from the nozzle 14 in the rising process in reverse. The exhaust gas is washed three times in sequence and three washing methods are adopted to achieve a better washing effect.
[0019] The spiral coil 11 is in a cone shape with a small diameter at the upper end and a large diameter at the lower end. In actual use, it is found that bubbles are ejected from the spiral coil 11, and the bubbles formed in the washing liquid are mostly concentrated in the annular area where the spiral coil 11 is located. The bubbles in other areas are relatively less distributed, which leads to uneven contact between the bubbles and the washing liquid, reducing the washing effect of volatile organic compounds in the exhaust gas. The spiral coil 11 in the utility model is in a cone shape, and the exhaust gas is ejected from the spray hole on the spiral coil 11, which can be more evenly distributed on the cross section of the washing chamber 3, thereby improving the washing effect of the exhaust gas.
[0020] A filter 15 is provided on the air inlet pipe at the air inlet end of the scrubber 1. The filter 15 is an existing device used to filter particulate impurities in the exhaust gas, effectively preventing the problem of particulate impurities accumulating and clogging the device in the later exhaust gas treatment.
[0021] A dehumidifier 16 is provided at the top of each washing chamber 3. The dehumidifier 16 is a prior art and is used to remove moisture from the gas. In the utility model, the exhaust gas containing volatile organic compounds has an increased moisture content after a series of washing processes. The moisture is removed by the dehumidifier 16 to keep the exhaust gas dry, avoid condensation of moisture after entering the adsorber 4 and reduce the adsorption capacity of the adsorbent 7, and ensure that the adsorbent 7 always has a good adsorption effect.
[0022] Each washing chamber 3 is provided with a drain port at the bottom thereof, which is connected to the liquid inlet of the washing device through a circulation pipe 17, and a water pump is provided on the circulation pipe 17. The washing liquid washes the waste gas containing volatile organic matter introduced into the washing chamber 3 to remove the volatile organic matter in the waste gas. In order to recycle the washing liquid, the washing liquid is returned to the washing chamber 3 through the circulation pipe 17 for continued use. In this way, the washing liquid is fully utilized to avoid waste of the washing liquid.
Claims
1. A comprehensive treatment system for volatile organic compounds in a coking plant, comprising a scrubber (1) and a burner (2) connected to each other, characterized in that The interior of the scrubber (1) is divided into a plurality of scrubbing chambers (3) of the same structure by vertical plates, a scrubbing device is arranged in the scrubbing chamber (3), a gas outlet of the preceding scrubbing chamber (3) is connected to a gas inlet of the succeeding scrubbing chamber (3) by a pipeline, a gas outlet of the last scrubbing chamber (3) is connected to an adsorber (4) by a pipeline, the adsorber (4) is divided into an adsorption chamber (5) and a regeneration chamber (6) by horizontal plates, a mesh cone hopper is arranged in the adsorption chamber (5), an adsorbent (7) is filled in the adsorption chamber (5) on the cone hopper, the bottom of the cone hopper is connected to the horizontal plate by a feed pipe, A valve is provided on the discharge pipe, and a plurality of baffles (8) are arranged in an inclined and staggered manner at intervals in the upper and lower parts of the regeneration chamber (6). A screw conveyor (9) is vertically provided on one side of the adsorber (4), and the lower end of the screw conveyor (9) is connected to the bottom of the regeneration chamber (6), and the upper end is connected to the top of the adsorption chamber (5). The bottom of the adsorption chamber (5) and the top of the regeneration chamber (6) are respectively connected to the inlet of the burner (2) through pipelines, and the flue gas outlet of the burner (2) is connected to an air-to-air heat exchanger (10), and the hot gas outlet of the air-to-air heat exchanger (10) is connected to the bottom of the regeneration chamber (6).
2. A coking plant volatile organic compound comprehensive treatment system according to claim 1, characterized in that The washing device comprises a spiral coil (11) and a central tube (12) which are concentrically arranged at the bottom of a washing chamber (3); the inlet and outlet of the spiral coil (11) are both connected to the central tube (12); a plurality of spray holes are processed on the spiral coil (11) and the central tube (12); the lower end of the central tube (12) is connected to an air inlet pipe; a filler (13) and a nozzle (14) are arranged in sequence from bottom to top in the washing chamber (3) above the spiral coil (11); the top of the previous washing chamber (3) is connected to the lower end of the central tube (12) in the next washing chamber (3); and the top of the last washing chamber (3) is connected to the top of the adsorption chamber (5) through a pipeline.
3. A coking plant volatile organic compound comprehensive treatment system according to claim 2, characterized in that The spiral coil (11) is in a conical shape with a small diameter at the upper end and a large diameter at the lower end.
4. A coking plant volatile organic compound comprehensive treatment system according to claim 1, characterized in that A filter (15) is provided on the air inlet pipe at the air inlet end of the scrubber (1).
5. A coking plant volatile organic compound comprehensive treatment system according to claim 1, characterized in that : A dehumidifier (16) is provided at the top of each washing chamber (3).
6. A coking plant volatile organic compound comprehensive treatment system according to claim 1, characterized in that A liquid discharge port is provided at the bottom of each washing chamber (3), and the liquid discharge port is connected to a liquid inlet of the washing device via a circulation pipe (17), and a water pump is provided on the circulation pipe (17).