Water washing and drying hot water tank mist eliminator
By designing a defogging device for the hot pure water tank in the washing and drying process, and using a condenser and a gas-liquid separator for gas-liquid separation, the problem of large steam exhaust and odor during the washing and drying of polyphenylene sulfide slurry was solved, achieving safe, labor-saving, and efficient pollutant treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG ZHONGTAI XINXIN CHEM TECH CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-21
Smart Images
Figure CN224524376U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polyphenylene sulfide production technology and is a defogging device for a hot pure water tank for washing and drying. Background Technology
[0002] Polyphenylene sulfide (PPS) is a high-performance engineering plastic with excellent overall properties. PPS possesses superior high-temperature resistance, corrosion resistance, radiation resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability, and good electrical properties. It is widely used as a structural polymer material and, through filling and modification, is extensively used as a specialty engineering plastic. Furthermore, it can be formulated into various functional films, coatings, and composite materials, achieving successful applications in electronics, aerospace, and automotive industries.
[0003] After separation, washing and purification, and drying, the PPS slurry is packaged. The washing and drying process uses 95℃ hot water for washing and purification. To save water resources and control production costs, wastewater is recycled. The wastewater (secondary steam condensate) recovered from the subsequent catalyst (sodium acetate) recovery process by a single-effect evaporation crystallization unit meets the washing and purification requirements (COD ≤ 1000 mg / L, pH: 7.4). The secondary steam condensate is heated from 40℃ to 95℃ using a heat exchanger and then transported to the hot pure water tank in the washing and drying process for washing the PPS resin. However, the hot pure water tank has a large steam venting volume and emits an odor; the pollutants in the vented air can easily pollute the environment. Summary of the Invention
[0004] This utility model provides a defogging device for a hot pure water tank used for washing and drying, which overcomes the shortcomings of the prior art. It can effectively solve the problems of large steam venting and odor in the existing polyphenylene sulfide slurry washing and drying process, and the easy pollution of the environment by the released gas.
[0005] The technical solution of this utility model is achieved through the following measures: a defogging device for a hot pure water tank for washing and drying, comprising a hot pure water tank, a condenser, and a gas-liquid separator. A secondary steam condensate pipeline is fixedly connected to the first inlet at the top of the hot pure water tank, a washing liquid pipeline is fixedly connected to the lower outlet of the hot pure water tank, a first gas phase pipeline is fixedly connected between the top outlet of the hot pure water tank and the middle inlet of the condenser, a second gas phase pipeline is fixedly connected between the middle outlet of the condenser and the lower first inlet of the gas-liquid separator, a tail gas emission pipeline is fixedly connected to the top outlet of the gas-liquid separator, a first wastewater pipeline is fixedly connected to the lower outlet of the gas-liquid separator, and a wastewater circulation pipeline is fixedly connected between the upper inlet of the gas-liquid separator and the first wastewater pipeline.
[0006] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0007] The gas-liquid separator described above is equipped with a demister mesh, packing material, and sieve plate. The demister mesh, packing material, and sieve plate are respectively installed in the upper, middle, and lower parts of the gas-liquid separator, and the sieve plate is configured as one or more layers.
[0008] The lower outlet of the gas-liquid separator is fixedly connected to a first wastewater pipeline, and the upper inlet of the gas-liquid separator is fixedly connected to the first wastewater pipeline via a wastewater circulation pipeline.
[0009] The condenser described above adopts a finned tube structure. The bottom inlet of the condenser is fixedly connected to a circulating water supply line, and the top outlet of the condenser is fixedly connected to a circulating return water supply line.
[0010] The above also includes a wash water tank, a first condensate pipeline is fixedly connected between the lower outlet of the condenser and the top inlet of the wash water tank, a second condensate pipeline is fixedly connected between the first gas phase pipeline and the first condensate pipeline, a wash water reuse pipeline is fixedly connected between the bottom outlet of the wash water tank and the second inlet at the top of the hot pure water tank, a wash water circulation pipeline is fixedly connected between the wash water reuse pipeline and the upper inlet of the wash water tank, and a wash water transfer pump is fixedly installed on the wash water reuse pipeline between the wash water circulation pipeline and the wash water tank.
[0011] A first venting pipeline is fixedly connected to the first gas phase pipeline between the aforementioned hot pure water tank and the second condensate pipeline, and a second venting pipeline is fixedly connected to the top outlet of the washing water tank.
[0012] A water supply line is fixedly connected between the aforementioned washing liquid pipeline and the second inlet at the bottom of the gas-liquid separator.
[0013] A second wastewater pipeline is fixedly connected to the first wastewater pipeline between the gas-liquid separator and the wastewater circulation pipeline.
[0014] A hot water delivery pump is fixedly installed on the washing liquid pipeline between the hot pure water tank and the water supply pipeline. A first wastewater circulation pump and a second wastewater circulation pump are fixedly installed on the first wastewater pipeline and the second wastewater pipeline between the inlet and outlet of the second wastewater pipeline, respectively.
[0015] The aforementioned hot pure water tank is fixedly equipped with a first level gauge and a thermometer; the washing water tank is fixedly equipped with a second level gauge; the gas-liquid separator is fixedly equipped with a third level gauge; a first condensate valve is fixedly equipped on the first condensate pipeline between the condenser and the second condensate pipeline; a second condensate valve is fixedly equipped on the second condensate pipeline; and a level regulating valve and a flow meter are fixedly equipped on the first wastewater pipeline between the wastewater circulation pipeline and the outlet of the first wastewater pipeline in sequence according to the flow direction of the medium.
[0016] The above also includes a PLC controller, which is equipped with a DCS control system. The washing water transfer pump, hot water transfer pump, first wastewater circulation pump, second wastewater circulation pump, first level gauge, thermometer, second level gauge, third level gauge, first condensate valve, second condensate valve, level regulating valve, and flow meter are all electrically connected to the DCS control system. An interlock is set between the third level gauge and the level regulating valve.
[0017] This utility model has a reasonable and compact structure and is easy to use. It utilizes a condenser to lower the gas temperature and partially condense the water vapor. The cooled gas then enters a gas-liquid separator, where the condensed liquid and residual gas are separated by the action of packing, sieve plates, and demister mesh. This eliminates the "white smoke" phenomenon generated when the hot pure water tank is vented, and effectively treats pollutants in the vented gas. It is safe, labor-saving, simple, and efficient. Attached Figure Description
[0018] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.
[0019] Appendix Figure 1 The codes are as follows: 1 for hot pure water tank, 2 for condenser, 3 for gas-liquid separator, 4 for secondary steam condensate pipeline, 5 for washing liquid pipeline, 6 for first gas phase pipeline, 7 for second gas phase pipeline, 8 for tail gas emission pipeline, 9 for first wastewater pipeline, 10 for wastewater circulation pipeline, 11 for circulating water supply pipeline, 12 for circulating water return pipeline, 13 for washing water tank, 14 for first condensate pipeline, 15 for second condensate pipeline, 16 for washing water reuse pipeline, 17 for... 18 is the wash water circulation pipeline, 29 is the first drain pipeline, 20 is the second drain pipeline, 21 is the water supply pipeline, 22 is the second wastewater pipeline, 23 is the hot water transfer pump, 24 is the first wastewater circulation pump, 25 is the second wastewater circulation pump, 26 is the first level gauge, 27 is the thermometer, 28 is the second level gauge, 29 is the third level gauge, 30 is the first condensate valve, 31 is the second condensate valve, 32 is the level regulating valve, and 33 is the flow meter. Detailed Implementation
[0020] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.
[0021] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.
[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.
[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0024] Example 1: As shown in the attached document Figure 1 As shown, the demisting device for the hot pure water tank for washing and drying includes a hot pure water tank 1, a condenser 2, and a gas-liquid separator 3. A secondary steam condensate pipeline 4 is fixedly connected to the first inlet at the top of the hot pure water tank 1. A washing liquid pipeline 5 is fixedly connected to the lower outlet of the hot pure water tank 1. A first gas phase pipeline 6 is fixedly connected between the top outlet of the hot pure water tank 1 and the middle inlet of the condenser 2. A second gas phase pipeline 7 is fixedly connected between the middle outlet of the condenser 2 and the lower first inlet of the gas-liquid separator 3. A tail gas emission pipeline 8 is fixedly connected to the top outlet of the gas-liquid separator 3. A first wastewater pipeline 9 is fixedly connected to the lower outlet of the gas-liquid separator 3. A wastewater circulation pipeline 10 is fixedly connected between the upper inlet of the gas-liquid separator 3 and the first wastewater pipeline 9.
[0025] In this invention, during the polyphenylene sulfide (PPS) production process, the secondary steam condensate generated by the single-effect evaporation crystallization device in the catalyst (sodium acetate) recovery process is heated from 40°C to 95°C and stored in a hot pure water tank 1 for washing PPS resin. The gaseous medium containing organic matter in the hot pure water tank 1 is cooled by the condenser 2 and then enters the gas-liquid separator 3 for gas-liquid separation. The separated tail gas is transported to the VOC (volatile organic compound) tail gas system via the tail gas emission pipeline 8. The separated liquid wastewater is partially reused for spraying in the gas-liquid separator 3 and the other part is sent for external treatment and then recycled.
[0026] The liquid medium in hot pure water tank 1 also comes from the flash evaporation process of polycondensation kettle, distillation condensate, and pure water pipeline in the polyphenylene sulfide production process.
[0027] The above-mentioned demisting device for the hot pure water tank used for washing and drying can be further optimized and / or improved according to actual needs:
[0028] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, the gas-liquid separator 3 is equipped with a demister mesh, packing and sieve plate inside. The demister mesh, packing and sieve plate are respectively arranged in the upper, middle and lower parts of the gas-liquid separator 3, and the sieve plate is arranged in one or more layers.
[0029] In this invention, the gas-liquid separator 3 adopts a combination of "upper packing + lower sieve plate" and a demisting mesh is provided on the top of the gas-liquid separator 3 to further remove tiny droplets.
[0030] Magnetic ring packing can be used as the packing material. The functions of magnetic ring packing are: to provide a huge specific surface area, increasing the contact area between the gas and liquid phases; the voids in the magnetic ring packing store some liquid, which can alleviate the impact of instantaneous flow fluctuations on the system; the void structure of the magnetic ring packing makes the fluid distribution more uniform, prolongs the contact time, and improves the mass transfer effect.
[0031] The auxiliary function of the sieve plate: The sieve plate is equipped with sieve holes, which can disperse the rising gas into fine bubbles, mix them thoroughly with the falling liquid, and enhance the mass transfer process; at the same time, the sieve plate can intercept impurities in the liquid and prevent the packing from clogging.
[0032] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, the condenser 2 adopts a finned tube structure. The bottom inlet of the condenser 2 is fixedly connected to the circulating water supply line 11, and the top outlet of the condenser 2 is fixedly connected to the circulating water return line 12.
[0033] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, it also includes a wash water tank 13, a first condensate pipeline 14 is fixedly connected between the lower outlet of the condenser 2 and the top inlet of the wash water tank 13, a second condensate pipeline 15 is fixedly connected between the first gas phase pipeline 6 and the first condensate pipeline 14, a wash water reuse pipeline 16 is fixedly connected between the bottom outlet of the wash water tank 13 and the second inlet at the top of the hot pure water tank 1, a wash water circulation pipeline 17 is fixedly connected between the wash water reuse pipeline 16 and the upper inlet of the wash water tank 13, and a wash water transfer pump 18 is fixedly installed on the wash water reuse pipeline 16 between the wash water circulation pipeline 17 and the wash water tank 13.
[0034] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, a first venting line 19 is fixedly connected to the first gas phase line 6 between the condenser 2 and the second condensate line 15, and a second venting line 20 is fixedly connected to the top outlet of the wash tank 13.
[0035] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a water supply line 21 is fixedly connected between the washing liquid line 5 and the second inlet at the bottom of the gas-liquid separator 3.
[0036] As needed, hot pure water is added to the gas-liquid separator 3 through the water supply line 21 to the required level, so that the gas-liquid separator 3 can perform better separation operation.
[0037] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, a second wastewater pipeline 22 is fixedly connected to the first wastewater pipeline 9 between the gas-liquid separator 3 and the wastewater circulation pipeline 10.
[0038] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, a hot water delivery pump 23 is fixedly installed on the washing liquid pipeline 5 between the hot pure water tank 1 and the water supply pipeline 21. A first wastewater circulation pump 24 and a second wastewater circulation pump 25 are fixedly installed on the first wastewater pipeline 9 and the second wastewater pipeline 22 between the inlet and outlet of the second wastewater pipeline 22, respectively.
[0039] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, a first level gauge 26 and a thermometer 27 are fixedly installed on the hot pure water tank 1; a second level gauge 28 is fixedly installed on the washing water tank 13; a third level gauge 29 is fixedly installed on the gas-liquid separator 3; a first condensate valve 30 is fixedly installed on the first condensate pipeline 14 between the condenser 2 and the second condensate pipeline 15; a second condensate valve 31 is fixedly installed on the second condensate pipeline 15; and a level regulating valve 32 and a flow meter 33 are fixedly installed on the first wastewater pipeline 9 between the wastewater circulation pipeline 10 and the outlet of the first wastewater pipeline 9, in sequence according to the medium flow direction.
[0040] As needed, sight glasses can be installed on the first condensate line 14 before the first condensate valve 30 and the second condensate line 15 before the second condensate valve 31. When the sight glasses are full of condensate, the first condensate valve 30 is opened and the condensate is discharged into the wash water tank 13.
[0041] Example 10: It differs from Examples 1 to 9 in that, as shown in the appendix... Figure 1 As shown, it also includes a PLC controller, which is equipped with a DCS control system. The washing water transfer pump 18, hot water transfer pump 23, first wastewater circulation pump 24, second wastewater circulation pump 25, first level gauge 26, thermometer 27, second level gauge 28, third level gauge 29, first condensate valve 30, second condensate valve 31, level regulating valve 32, and flow meter 33 are all electrically connected to the DCS control system. An interlock is set between the third level gauge 29 and the level regulating valve 32.
[0042] Depending on the needs, the pipelines and equipment of the demisting device for the hot pure water tank for washing and drying can also be equipped with conventional valves, thermometers 27, and pressure gauges known in the art, according to production requirements. The PLC controller can be a Siemens S7-1500, which is equipped with a Yokogawa CS3000 DCS control system.
[0043] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
[0044] The usage process of this utility model embodiment is as follows: First, hot pure water is added to the gas-liquid separator 3 to the required liquid level through the hot water transfer pump 23. The gaseous medium in the hot pure water tank 1 is cooled by the condenser 2 and then enters the gas-liquid separator 3. After gas-liquid separation, wastewater and tail gas are obtained. Next, part of the separated wastewater is returned to the gas-liquid separator 3 through the wastewater circulation pipeline 10 for spraying in the gas-liquid separator 3. The other part is sent out through the first wastewater circulation pump 24 and the first wastewater pipeline 9. After distillation, it is recycled. The separated tail gas is transported to the VOC tail gas system through the tail gas emission pipeline 8. Finally, the condensate generated after the gaseous medium is cooled by the condenser 2 and the condensate generated during the transportation of the gaseous medium through the first gas pipeline 6 are collected in the washing water tank 13 through the first condensate pipeline 14 and the second condensate pipeline 15, respectively. Then, they are recycled to the hot pure water tank 1 through the washing water transfer pump 18.
Claims
1. A defogging device for a hot pure water tank used for washing and drying, characterized in that... The system includes a hot pure water tank, a condenser, and a gas-liquid separator. A secondary steam condensate pipeline is fixedly connected to the first inlet at the top of the hot pure water tank. A washing liquid pipeline is fixedly connected to the lower outlet of the hot pure water tank. A first gas phase pipeline is fixedly connected between the top outlet of the hot pure water tank and the middle inlet of the condenser. A second gas phase pipeline is fixedly connected between the middle outlet of the condenser and the lower first inlet of the gas-liquid separator. A tail gas emission pipeline is fixedly connected to the top outlet of the gas-liquid separator. A first wastewater pipeline is fixedly connected to the lower outlet of the gas-liquid separator. A wastewater circulation pipeline is fixedly connected between the upper inlet of the gas-liquid separator and the first wastewater pipeline.
2. The demisting device for a hot pure water tank used for washing and drying according to claim 1, characterized in that... The gas-liquid separator is equipped with a demister mesh, packing, and sieve plate. The demister mesh, packing, and sieve plate are respectively installed in the upper, middle, and lower parts of the gas-liquid separator, and the sieve plate is configured as one or more layers.
3. The demisting device for a hot pure water tank used for washing and drying according to claim 1 or 2, characterized in that... The condenser adopts a finned tube structure. The bottom inlet of the condenser is fixedly connected to a circulating water supply line, and the top outlet of the condenser is fixedly connected to a circulating return water supply line.
4. The demisting device for a hot pure water tank used for washing and drying according to claim 3, characterized in that... It also includes a wash water tank, a first condensate pipeline is fixedly connected between the lower outlet of the condenser and the top inlet of the wash water tank, a second condensate pipeline is fixedly connected between the first gas phase pipeline and the first condensate pipeline, a wash water reuse pipeline is fixedly connected between the bottom outlet of the wash water tank and the second inlet at the top of the hot pure water tank, a wash water circulation pipeline is fixedly connected between the wash water reuse pipeline and the upper inlet of the wash water tank, and a wash water transfer pump is fixedly installed on the wash water reuse pipeline between the wash water circulation pipeline and the wash water tank.
5. The defogging device for the hot pure water tank during washing and drying according to claim 4, characterized in that... A first venting pipeline is fixedly connected to the first gas phase pipeline between the hot pure water tank and the second condensate pipeline, and a second venting pipeline is fixedly connected to the top outlet of the washing water tank.
6. The defogging device for a hot pure water tank used for washing and drying according to claim 5, characterized in that... A water supply line is fixedly connected between the washing liquid pipeline and the second inlet at the bottom of the gas-liquid separator.
7. The demisting device for a hot pure water tank used for washing and drying according to claim 2, 4, or 6, characterized in that... A second wastewater pipeline is fixedly connected to the first wastewater pipeline between the gas-liquid separator and the wastewater circulation pipeline.
8. The demisting device for a hot pure water tank used for washing and drying according to claim 7, characterized in that... A hot water delivery pump is fixedly installed on the washing liquid pipeline between the hot pure water tank and the water supply pipeline. A first wastewater circulation pump and a second wastewater circulation pump are fixedly installed on the first wastewater pipeline and the second wastewater pipeline, respectively, between the inlet and outlet of the second wastewater pipeline.
9. The defogging device for a hot pure water tank used for washing and drying according to claim 6 or 8, characterized in that... A first level gauge and a thermometer are fixedly installed on the hot pure water tank; a second level gauge is fixedly installed on the washing water tank; a third level gauge is fixedly installed on the gas-liquid separator; a first condensate valve is fixedly installed on the first condensate pipeline between the condenser and the second condensate pipeline; a second condensate valve is fixedly installed on the second condensate pipeline; and a level regulating valve and a flow meter are fixedly installed on the first wastewater pipeline between the wastewater circulation pipeline and the outlet of the first wastewater pipeline, in sequence according to the flow direction of the medium.
10. The demisting device for a hot pure water tank used for washing and drying according to claim 9, characterized in that... It also includes a PLC controller, which is equipped with a DCS control system. The washing water transfer pump, hot water transfer pump, first wastewater circulation pump, second wastewater circulation pump, first level gauge, thermometer, second level gauge, third level gauge, first condensate valve, second condensate valve, level regulating valve, and flow meter are all electrically connected to the DCS control system. An interlock is set between the third level gauge and the level regulating valve.