Chemical slurry drying system

Abstract

The utility model relates to the field of chemical production, and provides a chemical slurry drying system. Comprising a slurry storage tank, the bottom of the slurry storage tank is connected with a slurry pump, the output end of the slurry pump is connected with a centrifugal separation unit, and the centrifugal separation unit comprises a centrifugal machine connected with a fluidized bed dryer; the fluidized bed dryer comprises a first drying chamber and a second drying chamber which are arranged in parallel, and the top of the first drying chamber and the top of the second drying chamber are connected with a first cyclone dust collector and a second cyclone dust collector through pipelines respectively. Through a mode of combining centrifugal separation and a fluidized bed dryer, mixed liquid such as a solvent in slurry is separated in a centrifugal separation mode, and residual solid finished products and a small amount of liquid are dried and discharged in a two-stage drying cavity of the fluidized bed dryer; gas generated in the drying process is sent to the treatment device for treatment through the cyclone separation device, finished product dust contained in the gas is recycled, and the technical scheme is good in drying effect and capable of meeting the requirement for large-scale continuous production.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to a chemical slurry drying system. Background Art

[0002] In the process of chemical production, organic polymer materials will form slurry after reaction synthesis. The slurry contains liquid solvent and solid finished product. The finished product needs to be effectively separated and dried to obtain the final packaged finished product.

[0003] Common slurry drying methods mainly include the following: 1. Spray drying, using an atomizer to disperse the liquid into tiny droplets, the droplets float in the hot air in the drying chamber, and the water in the mist evaporates by heat to obtain powder and granular solid products. This method has the disadvantages of low thermal efficiency, bulky equipment, and complex system; 2. Drum drying, the slurry material is dried on the surface of a slowly rotating steam-heated drum. The slurry material forms a film on the surface in various ways. Once dried, the film will be scraped off and collected. The product is in the form of flakes. The finished product collection process of this method is complicated and is not suitable for large-scale chemical production processes; 3. Combined drying, using more than one drying method to achieve the drying purpose that cannot be completed by a single drying equipment. This method also has the disadvantages of complex equipment and cumbersome material transportation of different drying devices. Summary of the invention

[0004] In order to meet the production demand of large-scale slurry drying in chemical production, the utility model provides a chemical slurry drying system.

[0005] The technical solution adopted by the utility model is:

[0006] A chemical slurry drying system, comprising a slurry storage tank, the slurry storage tank is connected to a slurry input pipeline, an agitator is installed in the slurry storage tank, the bottom of the slurry storage tank is connected to a slurry pump, the output end of the slurry pump is connected to the top of the slurry storage tank and a centrifugal separation unit through a pipeline and a valve respectively; the centrifugal separation unit comprises a centrifuge, the solid material outlet of the centrifuge is connected to a vibrating feeder through a pipeline, the liquid material outlet of the centrifuge is connected to a mother liquid tank through a pipeline, and the bottom of the mother liquid tank is connected to the mother liquid pump; the vibrating feeder is connected to a fluidized bed dryer; the fluidized bed dryer comprises a first drying chamber and a second drying chamber in parallel, the first drying chamber and the second drying chamber are connected to each other through a pipeline and a valve. Heat exchangers are respectively installed in the drying chambers, and low-pressure steam is introduced into the heat exchangers; the lower parts of the first drying chamber and the second drying chamber are respectively connected to hot air devices, the tops of the first drying chamber and the second drying chamber are respectively connected to the first cyclone dust collector and the second cyclone dust collector through pipelines, and rotary valves are respectively installed at the bottoms of the first cyclone dust collector and the second cyclone dust collector, the rotary valve of the first cyclone dust collector is connected to the second drying chamber through a pipeline, and the rotary valve of the second cyclone dust collector is connected to the output end of the second drying chamber or the fluidized bed dryer through a pipeline; the second drying chamber is provided with a discharge port, and the discharge port is connected to the packaging station through a pipeline and a rotary valve.

[0007] Furthermore, the gas outlets at the tops of the first cyclone dust collector and the second cyclone dust collector are connected to exhaust fans through pipelines, and the exhaust fans are connected to the exhaust gas washing tower through pipelines.

[0008] Furthermore, a circulation pump and a water tank are provided on one side of the tail gas washing tower. The circulation pump sends water in the water tank to the top of the washing tower, and the bottom of the washing tower is connected to the water tank through a pipeline.

[0009] Furthermore, the hot air device includes a main blower, a first-stage air heater and a second-stage air heater. An air filter is installed at the input end of the main blower. The main blower blows air to the first-stage air heater and the second-stage air heater through a pipeline. The first-stage air heater and the second-stage air heater are respectively connected to the first drying chamber and the second drying chamber through pipelines.

[0010] Furthermore, an air preheater is installed between the main blower and a section of air heater, and the air preheater is a jacketed heat exchanger. The condensed water or steam output by the heat exchange medium channel of the heat exchanger is introduced into the heat exchange medium channel of the air preheater.

[0011] Furthermore, a buffer circuit is connected to the input pipeline of the first cyclone dust collector, and the buffer circuit includes a circulation pump, a jacket heater and an expansion tank which are connected in series in sequence.

[0012] Furthermore, the bottom of the mother liquor tank is connected to a wastewater tank through a pipeline and a valve, and the wastewater tank is connected to a wastewater pump.

[0013] After adopting the above technical scheme, the beneficial effects of the utility model are:

[0014] By combining centrifugal separation with a fluidized bed dryer, the solvent and other mixed liquids in the slurry are separated by centrifugal separation, and the remaining solid finished product and a small amount of liquid are dried and discharged in the two-stage drying chamber of the fluidized bed dryer. The gas generated during the drying process is sent to the processing device for treatment through a cyclone separation device, and the finished product dust contained in the gas is recovered. This technical solution has a good drying effect and can meet the requirements of large-scale continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a system schematic diagram of the utility model.

[0016] In the figure: slurry storage tank 1, slurry pump 2, centrifugal separation unit 3, centrifuge 31, vibrating feeder 32, mother liquor tank 4, fluidized bed dryer 5, first drying chamber 51, second drying chamber 52, heat exchanger 53, wind chamber 54, first cyclone dust collector 6, second cyclone dust collector 7, exhaust fan 8, tail gas washing tower 9, mother liquor pump 10, discharge pipeline 11, wastewater tank 12, main blower 13, first stage air heater 14, second stage air heater 15, air preheater 16, circulation pump 17, jacket heater 18, expansion tank 19, packaging station 20, circulation pump 21 and water tank 22. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0018] As shown in the figure, a chemical slurry drying system consists of a slurry storage tank 1, a slurry pump 2, a centrifugal separation unit 3, a mother liquor tank 4, a fluidized bed dryer 5, a first cyclone dust collector 6, a second cyclone dust collector 7, an exhaust fan 8, an exhaust gas washing tower 9 and related pipelines and valves, and is used for drying the finished product in the slurry.

[0019] The slurry storage tank 1 is a sealed tank. The top of the slurry storage tank 1 is connected to a slurry input pipeline. The slurry produced in the previous process is input through the input pipeline. An agitator is installed in the slurry storage tank 1 to stir the slurry to ensure uniform mixing of solids and liquids inside. The bottom of the slurry storage tank 1 is connected to a slurry pump 2. The slurry pump 2 extracts slurry from the slurry storage tank 1 and sends it to the centrifugal separation unit 3 through pipelines and valves, or circulates it back to the slurry storage tank from the top of the slurry storage tank 1. When the centrifugal separation unit 3 is overloaded or fails, the slurry pump 2 circulates the slurry in the slurry storage tank 1.

[0020] The centrifugal separation unit 3 includes two centrifuges 31 arranged in parallel. The slurry pump 2 sends the slurry into the two centrifuges 31 for solid-liquid separation. The liquid separated by the centrifuge 31 enters the mother liquid tank 4 through a pipeline. The mother liquid tank 4 is connected to a mother liquid pump 10, which sends the collected mother liquid to the subsequent station for recycling and treatment. The bottom of the mother liquid tank 4 is also provided with a discharge pipeline 11, which discharges the internal mother liquid to the wastewater tank 12 through the discharge pipeline 11, and then sends it to the wastewater treatment station by the wastewater pump connected to the wastewater tank 12. The solid finished product separated by the centrifuge 31 is sent to the fluidized bed dryer 5 for drying through the correspondingly connected vibrating feeders 32.

[0021] The fluidized bed dryer 5 is used for drying solid finished products, and includes a first drying chamber 51 and a second drying chamber 52 in parallel. Heat exchangers 53 are installed in the first drying chamber 51 and the second drying chamber 52, respectively, and low-pressure steam is introduced into the heat exchangers 53. Wind chambers 54 are provided at the bottom of each drying chamber, and each wind chamber 54 is connected to a hot air device. The hot air device includes a main blower 13, a first-stage air heater 14, and a second-stage air heater 15. An air filter is installed at the input end of the main blower 14. The main blower 13 blows air to the first-stage air heater 14 and the second-stage air heater 15 through a pipeline. An air preheater 16 is installed between the main blower 13 and the first-stage air heater 14. The air preheater 16 is a jacketed heat exchanger. The heat exchange medium channel of the air preheater 16 is passed through the condensed water or steam output from the heat exchange medium channel of the heat exchanger 53, so as to realize the secondary utilization of heat energy. The first stage air heater 14 and the second stage air heater 15 are connected to the wind chambers of the first drying chamber and the second drying chamber respectively through pipelines.

[0022] The first cyclone dust collector 6 and the second cyclone dust collector 7 are connected to the top of the first drying chamber 51 and the second drying chamber 52 through pipelines. The input pipeline of the first cyclone dust collector 6 is connected with a buffer circuit, which includes a circulating pump 17, a jacket heater 18 and an expansion tank 19 connected in series. It can be used to buffer the pressure in the pipeline. The bottom of the first cyclone dust collector 6 and the second cyclone dust collector 7 are respectively installed with a rotary valve. The dry dust collected by the first cyclone dust collector 6 enters the second drying chamber 52 through the rotary valve and the pipeline at the bottom thereof, and the dry dust collected by the second cyclone dust collector 7 returns to the second drying chamber 52 or the output end of the fluidized bed dryer through the rotary valve at the bottom thereof through the pipeline; the second drying chamber 52 is provided with a discharge port, which is connected to the packaging station 20 through a pipeline and a rotary valve, and the dried material enters the packaging station 20 from the discharge port of the second drying chamber 52.

[0023] The gas outlets at the top of the first cyclone dust collector 6 and the second cyclone dust collector 7 are connected to an exhaust fan 8 through a pipeline to generate negative pressure and lead out the steam in the fluidized bed dryer 5. The exhaust fan 8 is connected to the tail gas washing tower 9 through a pipeline. A circulation pump 21 and a water tank 22 are provided on one side of the tail gas washing tower 9. The circulation pump 21 sends the water in the water tank 22 to the top of the washing tower 9. The bottom of the washing tower 9 is connected to the water tank 22 through a pipeline to form a washing water circulation to treat the tail gas.

Claims

1. A chemical slurry drying system, comprising a slurry storage tank, the slurry storage tank is connected to a slurry input pipeline, an agitator is installed in the slurry storage tank, the bottom of the slurry storage tank is connected to a slurry pump, and the output end of the slurry pump is connected to the top of the slurry storage tank and a centrifugal separation unit through a pipeline and a valve respectively; characterized in that: The centrifugal separation unit comprises a centrifuge, wherein the solid material outlet of the centrifuge is connected to a vibrating feeder through a pipeline, and the liquid material outlet of the centrifuge is connected to a mother liquid tank through a pipeline, and a mother liquid pump is connected to the bottom of the mother liquid tank; the vibrating feeder is connected to a fluidized bed dryer; the fluidized bed dryer comprises a first drying chamber and a second drying chamber in parallel, wherein the first drying chamber and the second drying chamber are respectively provided with a heat exchanger, and low-pressure steam is introduced into the heat exchanger; the lower parts of the first drying chamber and the second drying chamber are respectively connected with a hot air device, the tops of the first drying chamber and the second drying chamber are respectively connected with a first cyclone dust collector and a second cyclone dust collector through a pipeline, and the bottoms of the first cyclone dust collector and the second cyclone dust collector are respectively provided with a rotary valve, the rotary valve of the first cyclone dust collector is connected to the second drying chamber through a pipeline, and the rotary valve of the second cyclone dust collector is connected to the second drying chamber or the output end of the fluidized bed dryer through a pipeline; the second drying chamber is provided with a discharge port, and the discharge port is connected to a packaging station through a pipeline and a rotary valve.

2. A chemical slurry drying system according to claim 1, characterized in that: The gas outlets at the tops of the first cyclone dust collector and the second cyclone dust collector are connected to exhaust fans through pipelines, and the exhaust fans are connected to the tail gas washing tower through pipelines.

3. A chemical slurry drying system according to claim 2, characterized in that: A circulation pump and a water tank are provided on one side of the tail gas washing tower. The circulation pump sends water in the water tank to the top of the washing tower. The bottom of the washing tower is connected to the water tank through a pipeline.

4. A chemical slurry drying system according to claim 1, characterized in that: The hot air device includes a main blower, a first-stage air heater and a second-stage air heater. An air filter is installed at the input end of the main blower. The main blower blows air to the first-stage air heater and the second-stage air heater through a pipeline. The first-stage air heater and the second-stage air heater are respectively connected to the first drying chamber and the second drying chamber through pipelines.

5. A chemical slurry drying system according to claim 4, characterized in that: An air preheater is installed between the main blower and a section of air heater. The air preheater is a jacketed heat exchanger. The condensed water or steam output by the heat exchange medium channel of the heat exchanger is introduced into the heat exchange medium channel of the air preheater.

6. A chemical slurry drying system according to claim 1, characterized in that: The input pipeline of the first cyclone dust collector is connected with a buffer circuit, and the buffer circuit includes a circulation pump, a jacket heater and an expansion tank which are connected in series in sequence.

7. A chemical slurry drying system according to claim 1, characterized in that: The bottom of the mother liquid tank is connected to a wastewater tank through a pipeline and a valve, and the wastewater tank is connected to a wastewater pump.

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