Drying machine chimney gas waste heat recovery processing system

Abstract

The utility model discloses a drying machine chimney gas waste heat recovery processing system which comprises a PTA drying machine chimney, the side surface of the PTA drying machine chimney is fixedly connected with a discharging screw, the lower end of the PTA drying machine chimney is fixedly connected with a three-stage screw, the right end of the three-stage screw is fixedly connected with a PTA drying machine, the right end of the PTA drying machine is provided with a drying gas inlet, and the right end of the PTA drying machine is provided with a drying gas outlet. The right end of the PTA drying machine is fixedly connected with a PTA drying machine condensation tank through a connecting pipe, the right end of the PTA drying machine is provided with an LP steam inlet, the upper end of a PTA drying machine chimney is fixedly connected with a PTA drying machine washing tower through a communicating pipe, and the upper end of the PTA drying machine washing tower is fixedly connected with a PTA drying gas washing tower through a connecting pipe; an oxidation outlet is formed in the upper end of the PTA dry gas washing tower, a chilled water opening is formed in the right side of the PTA dry gas washing tower, the left side of the PTA dryer washing tower is connected with a dryer washing tower cooler through a connecting pipe, and long-term normal operation of the dryer is facilitated through the devices.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery and treatment of dryer chimney gas, in particular to a waste heat recovery and treatment system for dryer chimney gas. Background Art

[0002] With the continuous strengthening of energy and environmental protection policies and the continuous advancement of industrial production technology, more and more companies have begun to pay attention to waste heat recovery and exhaust gas treatment issues, hoping to improve energy utilization efficiency, reduce production costs and minimize environmental pollution by adopting advanced treatment systems. However, traditional dryer chimney gas waste heat recovery and treatment measures often ignore the thermal energy contained in process water, resulting in energy waste. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a dryer chimney gas waste heat recovery and treatment system, which collects and utilizes the flash gas after the undried wet material enters the feeding screw and the water vapor generated by the dryer, and the heat exchanger collects and utilizes the heat, which can reduce the temperature of the system and also reduce the internal pressure of the system, which is beneficial to the long-term normal operation of the dryer. The system fully utilizes the thermal energy in the process water, saves energy, can improve energy efficiency and waste heat recovery, reduce operating costs, reduce energy expenditure, and is beneficial to reducing waste heat emissions and emission management costs. Through the arrangement of the PTA dryer scrubber and the dry gas scrubber, the dryer water vapor can be cooled and purified, which helps to reduce harmful substances in the water vapor and lower its temperature, thereby protecting the environment and improving the safety of the system.

[0004] The utility model also provides a waste heat recovery and processing system for dryer chimney gas, comprising: a PTA dryer chimney, a side surface of the PTA dryer chimney is fixedly connected to a feeding screw, the lower end of the PTA dryer chimney is fixedly connected to a three-stage spiral, the right end of the three-stage spiral is fixedly connected to a PTA dryer, the right end of the PTA dryer is provided with a dry gas inlet, the right end of the PTA dryer is fixedly connected to a PTA dryer condensation tank through a connecting pipe, the right end of the PTA dryer is provided with an LP steam inlet, and the upper end of the PTA dryer chimney is connected to a PTA dryer condensation tank through a connecting pipe. A PTA dryer washing tower is fixedly connected through a connecting pipe. The upper end of the PTA dryer washing tower is fixedly connected to a PTA dry gas washing tower through a connecting pipe. The upper end of the PTA dry gas washing tower is provided with an oxidation outlet. A chilled water outlet is provided on the right side of the PTA dry gas washing tower. The left side of the PTA dryer washing tower is connected to a dryer washing tower cooler through a connecting pipe. The lower end of the PTA dryer washing tower is fixedly connected to a tower bottom pump. Through the above devices, the system temperature can be lowered, and the internal pressure of the system can also be reduced, which is beneficial to the long-term normal operation of the dryer.

[0005] According to the dryer chimney gas waste heat recovery and treatment system described in the utility model, the side surface of the dryer washing tower cooler is provided with a refrigerator return water inlet, and the side surface of the dryer washing tower cooler is provided with a refrigerator water inlet outlet. The above device is beneficial to the recycling of water resources.

[0006] According to the dryer chimney gas waste heat recovery and treatment system described in the utility model, the lower end of the PTA dryer condensation tank is fixedly connected to the PTA dryer condensation pump, and the output end of the PTA dryer condensation pump is provided with a condensate outlet. The above device is beneficial to improving the discharge efficiency of the condensate.

[0007] According to the dryer chimney gas waste heat recovery and treatment system described in the utility model, a sewage outlet is provided at the lower end of the PTA dry gas washing tower and is located directly below the PTA dry gas washing tower. The above device is beneficial to the discharge of sewage.

[0008] According to the dryer chimney gas waste heat recovery and treatment system described in the utility model, the left side of the PTA dryer washing tower is fixedly connected to a water pump through a connecting pipe. The above device is beneficial to improving the washing efficiency.

[0009] According to the dryer chimney gas waste heat recovery and treatment system described in the utility model, the output end of the water pump is fixedly connected to the left end of the dryer washing tower cooler through a connecting pipe, and a process water inlet is provided between the connecting pipes. The above device is beneficial to heat exchange between the process water and the hot gas discharged from the washing tower.

[0010] Beneficial effects

[0011] 1. Compared with the existing technology, the dryer chimney gas waste heat recovery and treatment system collects and utilizes the flash gas after the undried wet material enters the feeding screw and the water vapor generated by the dryer through the heat exchanger, which can reduce the system temperature and the internal pressure of the system, which is beneficial to the long-term normal operation of the dryer.

[0012] 2. Compared with the existing technology, the dryer chimney gas waste heat recovery and treatment system fully utilizes the thermal energy of process water, saves energy, improves energy efficiency and waste heat recovery, reduces operating costs, reduces energy expenditure, is beneficial to reducing waste heat emissions and emission management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a process flow chart of the dryer chimney gas waste heat recovery and treatment system of this utility model.

[0015] Legend:

[0016] 1. Feeding screw; 2. PTA dryer chimney; 3. Three-stage screw; 4. PTA dryer; 5. PTA dryer condensate pump; 6. PTA dryer condensate tank; 7. Tower bottom pump; 8. PTA dryer scrubber; 9. Dryer scrubber cooler; 10. PTA dryer gas scrubber; 11. Oxidation outlet; 12. Chilled water inlet; 13. Sewage outlet; 14. Chiller return water inlet; 15. Chiller water inlet; 16. Process water inlet; 17. LP steam inlet; 18. Condensate outlet; 19. Drying gas inlet. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] Reference Figure 1 The utility model embodiment is a dryer chimney gas waste heat recovery and processing system, which includes: a PTA dryer chimney 2, a channel for water vapor transportation, a side surface of the PTA dryer chimney 2 is fixedly connected with a feeding screw 1 for feeding, a lower end of the PTA dryer chimney 2 is fixedly connected with a three-stage spiral 3 for wet material to enter the PTA dryer 4, the right end of the three-stage spiral 3 is fixedly connected with the PTA dryer 4 for drying the material, and the right end of the PTA dryer 4 is provided with a drying gas inlet 19 for the entry of drying gas. The right end is fixedly connected to a PTA dryer condensation tank 6 through a connecting pipe, which is used to collect the steam condensate generated during the drying process. The lower end of the PTA dryer condensation tank 6 is fixedly connected to a PTA dryer condensation pump 5, which is used to extract the condensate in the PTA dryer condensation tank 6 and discharge it to the outside through the condensate outlet. The output end of the PTA dryer condensation pump 5 is provided with a condensate outlet 18 for discharging the condensate. The right end of the PTA dryer 4 is provided with an LP steam inlet 17 for external low-pressure steam to enter the PTA dryer, thereby providing additional heat energy for the drying process.

[0019] The upper end of the PTA dryer chimney 2 is fixedly connected to a PTA dryer washing tower 8 through a connecting pipe for cooling the water vapor in the dryer. The upper end of the PTA dryer washing tower 8 is fixedly connected to a PTA dry gas washing tower 10 through a connecting pipe for purification. The upper end of the PTA dry gas washing tower 10 is provided with an oxidation outlet 11, and the water vapor used for purification is discharged from the PTA dry gas washing tower 10. The right side of the PTA dry gas washing tower 10 is provided with a chilled water inlet 12 for introducing chilled water into the PTA dry gas washing tower 10. The lower end of the PTA dry gas washing tower 10 is provided with a sewage outlet 13 for discharging sewage generated during the washing process from the washing tower.

[0020] The left side of the PTA dryer washing tower 8 is connected to a dryer washing tower cooler 9 through a connecting pipe, which is used to cool the washing liquid in the PTA dryer washing tower 8. The side surface of the dryer washing tower cooler 9 is provided with a refrigerator return water inlet 14, which is used for the external refrigerator return water to enter the dryer washing tower cooler 9, providing the necessary cold source for cooling the washing liquid. The side surface of the dryer washing tower cooler 9 is provided with a refrigerator water inlet outlet 15, which is used to discharge the chilled water in the dryer washing tower cooler 9 and return it to the refrigerator for recycling. A water pump is fixedly connected to the left side of the dryer washing tower 8 through a connecting pipe, which is used to extract the washing liquid in the PTA dryer washing tower 8 and transport it to the dryer washing tower cooler 9 through the connecting pipe for cooling treatment. The output end of the water pump is fixedly connected to the left end of the dryer washing tower cooler 9 through a connecting pipe. A process water inlet 16 is provided between the connecting pipes for replenishing the washing liquid in the PTA dryer washing tower 8. The lower end of the PTA dryer washing tower 8 is fixedly connected to a tower bottom pump 7 for extracting the accumulated liquid at the bottom of the washing tower and discharging it to the outside or for reuse.

[0021] Working principle: The wet material with a higher temperature (about 5.5 barg, 155°C) coming out of the PTA filter enters the discharge screw 1 (slightly positive pressure) through the rotary valve to flash and produce water vapor. The wet material is transported to the PTA dryer 4 through the three-stage screw 3. After the wet material enters the PTA dryer 4, it is heated to about 120°C-140°C by steam heating to evaporate the moisture in the wet material. The evaporated water vapor is carried away by the dry gas convection in the cylinder and finally enters the dryer chimney 2 and is then sent to the PTA dryer washing tower 8. In the PTA dryer washing tower 8, the water vapor contacts the cooling water through the spray device, thereby taking away its heat. The dryer washing tower cooler 9 recovers most of the heat to provide driving force for the refrigerator, and then the water with lower temperature continues to cool through the dryer washing tower cooler 9, and the cycle repeats.

[0022] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A dryer chimney gas waste heat recovery and treatment system, characterized in that: include: A PTA dryer chimney (2) is provided, wherein a feeding screw (1) is fixedly connected to the side surface of the PTA dryer chimney (2), a three-stage screw (3) is fixedly connected to the lower end of the PTA dryer chimney (2), a PTA dryer (4) is fixedly connected to the right end of the three-stage screw (3), a drying gas inlet (19) is provided at the right end of the PTA dryer (4), a PTA dryer condenser (6) is fixedly connected to the right end of the PTA dryer (4) via a connecting pipe, an LP steam inlet (17) is provided at the right end of the PTA dryer chimney, and a PTA dryer condenser (6) is fixedly connected to the right end of the PTA dryer (4). The upper end of (2) is fixedly connected to a PTA dryer washing tower (8) through a connecting pipe, the upper end of the PTA dryer washing tower (8) is fixedly connected to a PTA dry gas washing tower (10) through a connecting pipe, the upper end of the PTA dry gas washing tower (10) is provided with an oxidation outlet (11), the right side of the PTA dry gas washing tower (10) is provided with a chilled water inlet (12), the left side of the PTA dryer washing tower (8) is connected to a dryer washing tower cooler (9) through a connecting pipe, and the lower end of the PTA dryer washing tower (8) is fixedly connected to a tower bottom pump (7).

2. A dryer chimney gas waste heat recovery and treatment system according to claim 1, characterized in that: The side surface of the dryer washing tower cooler (9) is provided with a refrigerator return water inlet (14), and the side surface of the dryer washing tower cooler (9) is provided with a refrigerator water inlet outlet (15).

3. The dryer chimney gas waste heat recovery and treatment system according to claim 1, characterized in that: The lower end of the PTA dryer condensation tank (6) is fixedly connected to a PTA dryer condensation pump (5), and the output end of the PTA dryer condensation pump (5) is provided with a condensate outlet (18).

4. A dryer chimney gas waste heat recovery and treatment system according to claim 1, characterized in that: A sewage outlet (13) is provided at the lower end of the PTA drying gas washing tower (10) and is located directly below the PTA drying gas washing tower (10).

5. The dryer chimney gas waste heat recovery and treatment system according to claim 1, characterized in that: The left side of the PTA dryer washing tower (8) is fixedly connected to a water pump via a connecting pipe.

6. A dryer chimney gas waste heat recovery and treatment system according to claim 5, characterized in that: The output end of the water pump is fixedly connected to the left end of the dryer washing tower cooler (9) through a connecting pipe, and a process water inlet (16) is provided between the connecting pipes.

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