A drying device and treatment method for organic concentrated waste liquid

Abstract

The present invention belongs to the technical field of the treatment of organic concentrated wastewater, and relates to a drying device and a treatment method for organic concentrated waste liquid. The drying device includes a horizontally rotatable cylinder body and a power device for driving the rotation of the cylinder body. The cylinder body is divided into a discharge area and an evaporation and drying area. A heating device is arranged outside the cylinder body of the evaporation and drying area, and a feed inlet and an air extraction port are arranged at the tail end of the evaporation and drying area. The cylinder body of the discharge area is densely provided with discharge holes, and a cylindrical discharge cover is further arranged outside the discharge area. A discharge port is arranged below the discharge cover. Steel balls are placed in the cylinder body. The beneficial effect of the present invention is that it can solve the problems that the organic concentrated waste liquid adheres to the inner wall of the equipment in the later stage of evaporation, cannot be continuously dried, and cannot be normally discharged, improve the treatment efficiency, realize continuous and stable treatment, and improve the treatment capacity of the organic concentrated waste liquid.

Description

Technical Field

[0001] The present invention relates to a drying device and a treatment method for organic concentrated waste liquid, belonging to the technical field of treatment of organic concentrated wastewater. Background Art

[0002] At present, evaporation and concentration for desalination of high-salt and high-organic wastewater is a relatively common treatment method. However, this process will generate about 10% of organic concentrated waste liquid. After concentration, the salt content, organic matter content, and viscosity of the mother liquor are higher. In order to reduce the amount of hazardous waste and lower the treatment cost, various forms of drying devices and processes have emerged. The relatively mature drying devices or processes in China mainly include incineration, spray drying, vacuum paddle drying, scraper drying, etc. Although these devices or processes can solve part of the problem of drying concentrated mother liquor, they also have deficiencies such as scaling, corrosion, unqualified tail gas emissions, low efficiency, high operating cost, and demanding requirements for the viscosity of materials. To solve the above problems, we have invented a drying device and a treatment method for high-concentration and high-salt organic concentrated liquid.

[0003] Chinese Patent Application No. 992094461 discloses a wet-process aluminum fluoride externally heated dehydration drying rotary kiln, which consists of a cylinder body, an external heater, a support body, and a transmission mechanism. The cylinder body is divided into three sections: a drying area, a dehydration area, and a cooling area, which can quickly dehydrate and dry aluminum fluoride. However, the disadvantages of the above device are as follows: First, it cannot solve the problem of sticking to the wall and is not suitable for drying organic concentrated waste liquid. Second, it cannot achieve automatic production and cannot achieve automatic discharging. Summary of the Invention

[0004] The present invention provides a drying device and a treatment method for organic concentrated waste liquid, which solve the technical problems of material adhesion to the equipment cylinder wall, affecting heat transfer, reducing the evaporation efficiency of the equipment, difficult discharging, and large amount of hazardous waste during the drying process of high-viscosity, high-salt, and high-organic wastewater organic concentrated waste liquid, improve the equipment operation rate, reduce energy consumption, and realize the continuous treatment of organic concentrated waste liquid.

[0005] The present invention is specifically achieved by the following measures:

[0006] A drying device for organic concentrated waste liquid includes a horizontally rotatable cylinder body and a power device for driving the cylinder body to rotate. It is characterized in that: the cylinder body is divided into a discharging area and an evaporation and drying area. A heating device is arranged outside the cylinder body of the evaporation and drying area, and a feeding port and an air extraction port are arranged at the tail end of the evaporation and drying area; the cylinder body of the discharging area is densely provided with discharging holes, and a cylindrical discharging cover is further arranged outside the discharging area, and a discharging port is arranged below the discharging cover; steel balls are placed inside the cylinder body.

[0007] For the above-mentioned drying device for organic concentrated waste liquid, in order to block steel balls: a partition for blocking steel balls is provided between the discharge area and the evaporation drying area, and the partition has sieve holes smaller than the size of the steel balls.

[0008] For the above-mentioned drying device for organic concentrated waste liquid, in order to cool the material in the discharge area and let a small amount of air enter the discharge area: there is a gap between the discharge area and the discharge cover.

[0009] For the above-mentioned drying device for organic concentrated waste liquid, preferably: the length ratio of the discharge area to the evaporation drying area is 1:8 - 15.

[0010] For the above-mentioned drying device for organic concentrated waste liquid, preferably: the addition amount of the steel balls accounts for 30 - 60% of the volume of the evaporation drying area, and the diameter of the steel balls is 20 - 70 mm.

[0011] For the above-mentioned drying device for organic concentrated waste liquid, preferably: the heating device is a half pipe wound around the outer wall of the cylinder, and a heat transfer oil inlet and a heat transfer oil outlet located at the end of the discharge area.

[0012] For the above-mentioned drying device for organic concentrated waste liquid, preferably: the distance between the discharge area and the half pipe of the heating device is 0.5 - 2 meters; the inner lining of the cylinder is 2205 duplex steel; the outer wall of the discharge area is 2205 duplex steel, and the outer wall of the evaporation drying area is 2205 + carbon steel composite plate.

[0013] For the above-mentioned drying device for organic concentrated waste liquid, preferably: a feed diversion pipe is connected between the feed inlet and the air extraction port; a heat transfer diversion pipe is connected between the heat transfer oil inlet and the heat transfer oil outlet.

[0014] The present invention also discloses a treatment method using the above-mentioned drying device for organic concentrated waste liquid, which adopts the following steps:

[0015] First, add a certain amount of steel balls into the equipment, then continuously pump a certain amount of organic concentrated waste liquid into the cylinder by a pump, continuously heat the organic concentrated waste liquid through the heat transfer oil in the half pipe, the organic concentrated waste liquid is continuously evaporated and concentrated, and at the same time, the steel balls in the equipment stir and crush the organic concentrated waste liquid to prevent the organic concentrated waste liquid from adhering to the inner wall of the rotary dryer and affecting heat transfer; under the rotation of the dryer, the material is pushed to the discharge area, and finally solid granular or powdery solids are discharged.

[0016] The specific parameters are as follows: (1) The inlet temperature of the organic concentrated waste liquid is 30 - 60 °C, and the inlet flow rate is 2 - 5 t / h; (2) The evaporation temperature of the wastewater is 105 - 120 °C, and the pressure is atmospheric pressure; (3) The inlet temperature of the heat-conducting oil is 200 - 240 °C, the outlet temperature is 180 - 220 °C, and the flow rate of the heat-conducting oil is 100 - 500 m³ / h; (4) The diameter of the filled steel balls is 20 - 70 mm, and the filling rate of the steel balls is 40% - 60%; (5) The rotational speed of the cylinder of the rotary dryer is 15 - 40 r / min.

[0017] To solve the problems such as the organic concentrated waste liquid adhering to the inner wall of the equipment, affecting heat transfer, and reducing the evaporation efficiency of the equipment... etc., the present invention mainly starts from two aspects. One is to invent a rotary drying device to evaporate and concentrate the organic concentrated waste liquid. After the organic concentrated waste liquid is processed, solid powder is obtained and discharged through the discharge port; the other is to invent a treatment method for the organic concentrated waste liquid. Through this method, the continuous treatment of the organic concentrated waste liquid can be realized, and the stable operation of the organic concentrated waste liquid treatment device can be ensured through appropriate process control, so as to realize the continuity and stability of wastewater treatment.

[0018] To facilitate the maintenance of the interior of the equipment, a manhole is opened at each end of the rotary dryer; one end of the rotary dryer is provided with inlets and outlets for the heat-conducting oil, and the other end is provided with an inlet and an air extraction port for the organic concentrated waste liquid.

[0019] The rotary dryer is a horizontal cylindrical dryer of the semi-coiled pipe jacket type. Two or four supporting wheels are used to rotate the cylinder, and the cylinder is placed horizontally. There is a rotary joint at one end. The material is fed on the right side of the joint, and air is extracted from the upper side, with continuous feeding; the rotary joint at the other end is for the inlet and outlet of the heat-conducting oil. The whole body is divided into a heating, evaporating and drying area and a discharging area. The discharging area is located at the opposite end of the feeding end. A discharging hole is opened on the cylinder wall near the rotary joint in a section of the discharging area, and the cylinder forms a sieve plate. A collecting cover and a discharging port are made around its outer cylinder wall; the sieve plate is 0.5 - 2 meters away from the heating, evaporating and drying area. An appropriate amount of steel balls are added into the dryer, and the steel balls play the role of stirring and crushing.

[0020] Advantages of the present invention

[0021] (1) It can solve the problem that the organic concentrated waste liquid adheres to the inner wall of the equipment in the later stage of evaporation, making it impossible to continue drying and discharge materials normally.

[0022] (2) It can improve the operation rate of the equipment, improve the heat utilization rate, and reduce energy consumption.

[0023] (3) It can realize the continuous and stable treatment of wastewater and improve the treatment capacity of the organic concentrated waste liquid. Brief description of the drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0025] Figure 2 Schematic diagram of the enlarged structure of part A of Figure 1 ;

[0026] Figure 3 Schematic diagram of the sectional structure of the evaporation drying zone of Figure 1 ;

[0027] Figure 4 Schematic diagram of the sectional structure of the discharge zone;

[0028] Figure 5 Schematic diagram of the enlarged structure of part B of Figure 1 ;

[0029] Figure 6 Schematic diagram of the enlarged structure of part C of Figure 1 ;

[0030] In the figure, 1 - oil - guiding rotary joint; 2 - head; 3 - discharge zone; 4 - discharge hole; 5 - half - pipe; 6 - evaporation drying zone; 7 - combination of idler wheels; 8 - rigid coupling; 9 - cycloid pinwheel speed reducer; 10 - frame; 11 - manhole; 12 - feed rotary joint; 13 - girth gear; 14 - backing plate; 15 - support ring; 16 - support collar; 17 - rib plate; 18 - discharge hood; 19 - oil - guiding shunt pipe; 20 - feed shunt pipe; 21 - metal hose; 22 - duplex stainless steel; 23 - discharge port; 24 - partition plate.

[0031] a - heat - conducting oil inlet; b - heat - conducting oil outlet; c - air extraction port; d - feed inlet; e1 - manhole; e2 - manhole. Detailed implementation mode

[0032] To further understand the present invention, the drying device and treatment method for high - concentration and high - salinity organic concentrate will be described in detail below.

[0033] Embodiment 1

[0034] The drying device for organic concentrated waste liquid of the present invention is as shown in Figures 1-6 .

[0035] The cylinder body is a rotary dryer and can rotate in the horizontal direction. The outer diameter of the outer cylinder is 2500 mm; the inner lining of the outer cylinder wall is 2205 duplex steel with a wall thickness of 3 - 5 mm; there are heads 2 on both the left and right sides, the total length of the cylinder body is 1600 mm, the cylinder body is divided into two parts, the left side is the discharge zone 3 with a length of 1000 mm, and the right side is the evaporation drying zone 6 with a length of 10000 mm. The inner lining of the outer cylinder wall is 2205 duplex steel; the material of the rotary dryer can be stainless steel or carbon steel; to save costs, the material of the discharge zone can be selected as 2205, and the other areas can be selected as 2205 + carbon steel composite plate.

[0036] For the convenience of maintaining the interior of the equipment, a manhole (e1 and e2 respectively) is opened at each end of the rotary dryer; the right end of the rotary dryer is the evaporation drying zone, and a feed rotary joint 12, a feed shunt pipe 20, a feed inlet (d) and an air extraction port (c) are arranged at the tail end.

[0037] The cylinder body of the discharge area is densely provided with discharge holes (4), and the aperture of the discharge holes is 5 mm. There is also a cylindrical discharge hood (18) arranged outside the discharge area, and a discharge port (23) is arranged below the discharge hood. There is a 40-mm gap between the outer cylinder wall of the discharge area and the discharge hood (18), and a small amount of air can enter the discharge area to cool the material.

[0038] A partition plate (24) for blocking steel balls is arranged between the discharge area (4) and the evaporation drying area (6). The partition plate (24) is located on the left side of the discharge area (4) and is in the shape of a sieve plate as a whole, mainly used for blocking steel balls. The aperture of the sieve holes on the partition plate (24) is 5 mm, and the hole pitch is 2 mm. The aperture of the sieve holes is smaller than the size of the steel balls but larger than the diameter of the dried material, so the steel balls and the material are effectively separated.

[0039] A heating device is arranged outside the cylinder body of the evaporation drying area. The heating device is a semi-tube with 108x5 attached to the outside of the cylinder body. A guide oil rotary joint 1, a heat conduction shunt pipe (19), a heat conduction oil inlet (a) and a heat conduction oil outlet (b) are arranged at the left end of the cylinder body.

[0040] The rotary device includes rotating the cylinder body by using four supporting wheels, and the cylinder body is placed horizontally. It includes a frame 10, a cycloidal pinwheel speed reducer 9, a rigid coupling 8, and a supporting wheel combination 7. It also includes a girth gear 13; a backing plate 14; a support ring 15; a support ring 16; and a rib plate 17. The rotary device lifts and rotates the cylinder body, and the materials in the cylinder body are rotated uniformly in the same direction, so as to realize continuous feeding and discharging. At the same time, the steel balls in the cylinder body will be continuously thrown up and fallen with the rotation of the drum, so as to fully stir and crush the organic concentrated waste liquid, prevent the organic concentrated waste liquid from adhering to the cylinder wall of the rotary dryer, maintain a high heat transfer efficiency, and finally obtain small-particle dried materials.

[0041] The above device is used to treat organic concentrated waste liquid. The organic concentrated waste liquid is the evaporation mother liquor of accelerator wastewater in the rubber auxiliaries industry, and contains sodium chloride and resinous organic matter respectively. The organic concentrated waste liquid has a COD of 400,000 mg / L, a pH of 7, a solid content of 50%, and a viscosity of 300 cp.

[0042] First, a certain amount of steel balls with a diameter of 50 mm are added into the device, and the steel ball filling rate is 50%; then a certain amount of organic concentrated waste liquid is continuously pumped into the rotary dryer by a pump. The temperature of the organic concentrated waste liquid is 30 °C, and the inlet water flow rate is 8 t / h; then the organic concentrated waste liquid is continuously heated by the heat-conducting oil in the half pipe. The inlet oil temperature of the heat-conducting oil is 240 °C, the outlet oil temperature is 220 °C, and the flow rate of the heat-conducting oil is 150 m³ / h. The organic concentrated waste liquid is continuously evaporated and concentrated. At the same time, the steel balls in the device will be continuously thrown up and fallen with the rotation of the drum, so as to fully stir and break the organic concentrated waste liquid, prevent the organic concentrated waste liquid from adhering to the cylinder wall of the rotary dryer, and maintain a high heat transfer efficiency. Finally, under the rotation of the dryer, the rotational speed of the dryer cylinder is 40 r / min; the solid granular or powdery solid materials are gradually pushed to the discharge area and finally discharged and bagged. After treatment, the emission reduction amount of the organic concentrated waste liquid is 40%.

[0043] Continuous operation for 168 hours without clogging.

[0044] The discharge amount is 4.8 t / h. After measurement, the components are sodium chloride and resin, and the water content is 20%.

[0045] Example 2

[0046] The device of Example 1 is used to treat the evaporation mother liquor of the anti-scorching agent wastewater in the rubber auxiliaries industry.

[0047] The specific treatment method is as follows:

[0048] The above device is used to treat the organic concentrated waste liquid, and the organic concentrated waste liquid is the evaporation mother liquor of the anti-scorching agent wastewater in the rubber auxiliaries industry, which contains sodium chloride, phthalic anhydride, and dicyclohexyl disulfide organic substances respectively, and the concentration is 55%. The COD of the organic concentrated waste liquid is 430,000 mg / L, pH = 7, the solid content is 55%, and the viscosity is 250 cp.

[0049] First, a certain amount of steel balls with a diameter of 30 mm are added into the device, and the steel ball filling rate is 40%; then a certain amount of organic concentrated waste liquid is continuously pumped into the rotary dryer by a pump. The temperature of the organic concentrated waste liquid is 30 °C, and the inlet flow rate is 8 t / h; then the organic concentrated waste liquid is continuously heated by the heat transfer oil in the half pipe. The inlet temperature of the heat transfer oil is 240 °C, the outlet temperature is 220 °C, and the flow rate of the heat transfer oil is 150 m³ / h. The organic concentrated waste liquid is continuously evaporated and concentrated. At the same time, the steel balls in the device will be continuously thrown up and fallen with the rotation of the drum, so as to fully stir and break the organic concentrated waste liquid, prevent the organic concentrated waste liquid from adhering to the cylinder wall of the rotary dryer, and maintain a high heat transfer efficiency. Finally, under the rotation of the dryer, the rotational speed of the dryer cylinder is 40 r / min; the solid granular or powdery solid materials are gradually pushed to the discharge area, and finally discharged and bagged. After treatment, the emission reduction amount of the organic concentrated waste liquid is 50%.

[0050] After continuous operation for 336 hours, no blockage phenomenon occurred.

[0051] The discharge amount is 4 t / h. After measurement, the components are sodium chloride, phthalic anhydride, and dicyclohexyl disulfide organic matter, and the water content is 10%.

Claims

1. A drying device for organic concentrated waste liquid, comprising a horizontally rotatable cylinder body and a power device for driving the cylinder body to rotate, characterized in that: The described cylinder body is divided into a discharging area (3) and an evaporation drying area (6). A heating device is arranged outside the cylinder body of the evaporation drying area, and a feeding port (d) and an air extraction port (c) are arranged at the tail end of the evaporation drying area; discharging holes (4) are densely distributed on the cylinder body of the discharging area, and a cylindrical discharging hood (18) is further arranged outside the discharging area, and a discharging port (23) is arranged below the discharging hood; steel balls are placed in the cylinder body. The added amount of the steel balls accounts for 30 - 60% of the volume of the evaporation drying area, and the diameter of the steel balls is 20 - 70 mm. The distance between the discharging area and the half pipe of the heating device is 0.5 - 2 meters.

2. The drying device for the organic concentrated waste liquid according to claim 1, characterized in that: A partition plate (24) for blocking the steel balls is arranged between the discharging area (3) and the evaporation drying area (6), and the partition plate (24) has sieve holes smaller than the size of the steel balls.

3. The drying device for the organic concentrated waste liquid according to claim 1, characterized in that: There is a gap between the discharging area and the discharging hood (18).

4. The drying device for the organic concentrated waste liquid according to claim 1, wherein: The length ratio of the discharging area (3) to the evaporation drying area (6) is 1:8 - 15.

5. The drying device for the organic concentrated waste liquid according to claim 1, characterized in that: The described heating device is a half pipe wound around the outside of the cylinder body, and a heat-conducting oil inlet (a) and a heat-conducting oil outlet (b) located at the tail end of the discharging area.

6. The drying device for the organic concentrated waste liquid according to claim 5, characterized in that: A feeding shunt pipe (20) is connected between the feeding port (d) and the air extraction port (c); a heat-conducting shunt pipe (19) is connected between the heat-conducting oil inlet (a) and the heat-conducting oil outlet (b).

7. A treatment method using the drying device for the organic concentrated waste liquid according to claim 1, characterized in that The following steps are adopted: First, add a certain amount of steel balls into the equipment, then continuously pump a certain amount of organic concentrated waste liquid into the cylinder body by a pump, continuously heat the organic concentrated waste liquid through the heat-conducting oil in the half pipe. The organic concentrated waste liquid is continuously evaporated and concentrated. At the same time, the steel balls in the equipment stir and break the organic concentrated waste liquid to prevent the organic concentrated waste liquid from adhering to the cylinder wall of the rotary dryer and affecting heat transfer; under the rotation of the dryer, the materials are pushed to the discharging area, and finally solid granular or powdery solids are discharged. The specific parameters are: (1) The inlet temperature of the organic concentrated waste liquid is 30 - 60 °C, and the inlet flow rate is 2 - 5 t / h; (2) The evaporation temperature of the wastewater is 105 - 120 °C, and the pressure is atmospheric pressure; (3) The inlet temperature of the heat-conducting oil is 200 - 240 °C, the outlet temperature is 180 - 220 °C, and the flow rate of the heat-conducting oil is 100 - 500 m³ / h; (4) The diameter of the filled steel balls is 20 - 70 mm, and the filling rate of the steel balls is 40% - 60%; (5) The rotational speed of the cylinder body of the rotary dryer is 15 - 40 r / min.

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