Periodic blowdown device for PTA (pure terephthalic acid) boiler

Abstract

The utility model belongs to the technical field of wastewater reuse, and discloses a PTA boiler periodic blowdown device which comprises a blowdown cooling pool, an industrial water pipe, a blowdown lifting pump and a blowdown lifting assembly, the blowdown cooling pool is divided into two paths, one path is a conventional sewage pipeline, the other path is connected into a factory circulating water pipe network and merged into a circulating water pool, and the industrial water pipe is connected with the industrial water pipe. The blowdown cooling pool is communicated with boiler emergency drain water, deaerator drain water, water supply tank drain water, economizer drain water, superheater drain water, continuous drain water and definite drain water, and is communicated with the blowdown cooling pool through a flash tank; the industrial water pipe is a path of normal-temperature production industrial water, the boiler design rated load is 240 t / h, the boiler design blowdown rate is 2%, boiler emergency drainage, deaerator drainage, water supply tank drainage, economizer drainage, superheater drainage and the like are adopted, regular blowdown is achieved, the boiler blowdown wastewater recycling system is matched with design and transformation, the wastewater treatment cost is reduced, and the energy consumption is reduced. And water resources are saved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater reuse technology, specifically a PTA boiler periodic blowdown device. Background Technology

[0002] Boiler wastewater recycling technology has been widely applied in various fields. Generally, the clean water from continuous boiler blowdown, periodic blowdown, deaerator discharge, feedwater tank discharge, boiler emergency discharge, economizer discharge, and superheater condensate is collected and discharged into the blowdown tank. Then, it is pumped into the owner's equalization tank through the sewage pipeline. The effluent from the equalization tank is pumped into the wastewater tank, anaerobic reactor, and aerobic reaction tank. After coagulation, flocculation, and sedimentation, the hardness and suspended solids content of the wastewater are reduced. The effluent flows by gravity into the V-type filter. The V-type filter is equipped with a double layer of manganese sand and quartz sand to remove residual fine suspended solids and bacteria attached to suspended particles in the effluent from the sedimentation tank, while reducing the manganese and iron ion content in the wastewater.

[0003] In existing technologies, wastewater systems typically use acid to adjust the pH and reduce the alkalinity of the wastewater, thereby lowering the calcium and magnesium ion content in the system. This method is costly. Since boiler economizer drains, superheater drains, boiler emergency drains, deaerator drains, and feedwater tank drains are relatively clean, and only a small amount of continuous and constant discharge contains salt and some dispersed, loose sludge formed due to boiler water concentration, the overall water quality is good. Directly discharging this into the wastewater system would increase the burden on the wastewater treatment system and increase wastewater treatment costs.

[0004] Therefore, a periodic blowdown device for PTA boilers is proposed to address the above problems. Utility Model Content

[0005] To address the problems mentioned in the background section, this utility model provides a PTA boiler periodic blowdown device, which designs and modifies a wastewater reuse system for boiler blowdown wastewater, thereby reducing wastewater treatment costs and conserving water resources.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a PTA boiler periodic blowdown device, comprising a blowdown cooling pool, an industrial water pipe, a blowdown lifting pump, and a blowdown lifting assembly. The blowdown cooling pool is divided into two paths, one of which is a conventional sewage pipeline, and the other is connected to the plant's circulating water network and flows into the circulating water pool. The blowdown cooling pool is connected to the boiler emergency water discharge, deaerator water discharge, feedwater tank water discharge, economizer water discharge, superheater condensate, continuous drainage, and fixed drainage, and is connected to the blowdown cooling pool via an expansion container.

[0007] The industrial water pipe is a single line for producing industrial water at ambient temperature, and this line is connected to the wastewater cooling pool.

[0008] The water channel of the sewage cooling pool is lifted by the sewage lifting component, and the sewage lifting component is connected to a fixed discharge expansion container and connected to a continuous discharge expansion container by an industrial water pipe.

[0009] Preferably, the sewage lifting assembly includes a lifting pump for lifting sewage cooling pools, and a U-shaped pipe is fixedly installed on the outside of the lifting pump, wherein all sewage cooling pools are connected through the U-shaped pipe.

[0010] Preferably, a central pipe is connected to the lowest end of the U-shaped tube, a sealing pipe is sleeved on the outside of the connection between the U-shaped tube and the central pipe, a bottom sedimentation tank is fixedly installed at the bottom end of the central pipe, an inner liner is fixedly installed inside the bottom sedimentation tank, and a partition plate fixedly installed at the top of the inner liner and fixedly installed with the central pipe.

[0011] Preferably, a filter screen is fixedly disposed on the left side of the top opening of the inner liner, which is fixedly disposed with the partition.

[0012] Preferably, both sides of the inner liner are connected to a return water pipe that passes through the bottom sedimentation tank, and the other end of the return water pipe is fixedly connected to a treatment box.

[0013] Preferably, a pump is fixedly installed inside the return water pipe.

[0014] Preferably, the interior of the treatment chamber can be filled with deodorizing substances, such as polypropylene balls or charcoal.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model achieves regular blowdown by designing a boiler with a rated load of 240t / h and a designed blowdown rate of 2%. It includes boiler emergency water discharge, deaerator water discharge, feedwater tank water discharge, economizer water discharge, and superheater drainage. Combined with the designed and modified boiler blowdown wastewater reuse system, it reduces wastewater treatment costs and saves water resources.

[0017] 2. This utility model, through the sedimentation tank in the sewage lifting component and the treatment box, can isolate and filter the sewage passing through the U-shaped pipe when sewage is lifted inside the sewage cooling pool, and then perform secondary sedimentation treatment in the treatment box, thereby reducing the continuous circulation of impurities in the sewage and reducing energy consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall sewage discharge process of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of the sewage lifting component of this utility model;

[0020] Figure 3This is a three-dimensional structural diagram of the sewage lifting component of this utility model;

[0021] Figure 4 This is a cross-sectional view of the bottom sedimentation tank of this utility model.

[0022] In the diagram: 1. Sewage lifting assembly; 11. U-shaped pipe; 12. Lifting pump; 13. Centralized pipe; 14. Bottom sedimentation tank; 15. Sealing pipe; 16. Inner liner; 17. Baffle plate; 18. Filter screen; 19. Return water pipe; 110. Pump; 111. Treatment tank. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 4 As shown, this utility model provides a PTA boiler periodic blowdown device, including a blowdown cooling pool, an industrial water pipe, a blowdown lifting pump, and a blowdown lifting component 1. The blowdown cooling pool is divided into two paths, one of which is a conventional sewage pipeline, and the other is connected to the plant's circulating water network and flows into the circulating water pool. The wastewater is discharged and treated in two separate ways. During the periodic blowdown process, relatively clean water resources can be reused. The blowdown cooling pool is connected to the boiler emergency water discharge, deaerator water discharge, feedwater tank water discharge, economizer water discharge, superheater condensate, continuous drainage, and fixed drainage. It is also connected to the blowdown cooling pool through an expansion container for cooling treatment.

[0025] The industrial water pipeline consists of one line of ambient temperature industrial water production and is connected to the sewage cooling pool.

[0026] The water level in the sewage cooling pool is raised by the sewage lifting component 1, which is connected to a fixed discharge expansion container and an industrial water pipe. The fixed discharge expansion container is connected to the fixed discharge expansion container for water resource recycling and secondary use.

[0027] Specifically, the sewage lifting assembly 1 includes a lifting pump 12 for lifting sewage cooling tanks. A U-shaped pipe 11 is fixedly installed on the outside of the lifting pump 12. Sewage is lifted by the lifting pump 12. The sewage cooling tanks are all connected through the U-shaped pipe 11. A central pipe 13 is connected to the lowest end of the U-shaped pipe 11. A sealing pipe 15 is sleeved on the outside of the connection between the U-shaped pipe 11 and the central pipe 13 to strengthen the seal between the U-shaped pipe 11 and the central pipe 13. A bottom sedimentation tank 14 is fixedly installed at the bottom end of the central pipe 13. An inner liner 16 is fixedly installed inside the bottom sedimentation tank 14. The inner liner 16 filters and separates impurities in the sewage. A baffle 17 is fixedly installed at the top of the inner liner 16 and is fixedly installed with the central pipe 13. A filter screen 18 is fixedly installed on the left side of the top opening of the inner liner 16 and is fixedly installed with the baffle 17. The baffle 17 and the filter screen 18 can effectively filter impurities in the sewage.

[0028] Both sides of the inner tank 16 are connected to a return water pipe 19 that runs through the bottom sedimentation tank 14. The other end of the return water pipe 19 is fixedly installed with a treatment box 111. The treatment box 111 performs centralized circulation treatment to settle and recover impurities in the sewage. A pump 110 is fixedly installed inside the return water pipe 19. The inside of the treatment box 111 can be filled with deodorizing substances, such as polypropylene balls or charcoal, to adsorb impurities in the sewage.

[0029] The booster pump 12 and pump 110 are existing technologies and will not be described in detail. Additionally, this utility model also includes a power supply, controller, and switch, which are not the main technical points of this patent and will not be described in detail. The wiring diagram of the motor in this utility model is common knowledge in the field, and its working principle is already known technology. The appropriate model is selected based on actual use; therefore, the control method and wiring layout of the motor will not be explained in detail.

[0030] Working principle and process:

[0031] The wastewater discharge and cooling tank is a centralized collection system for boiler emergency discharge, deaerator discharge, feedwater tank discharge, economizer discharge, superheater condensate, continuous discharge, and scheduled discharge. After flash evaporation and cooling in the expansion tank, the wastewater is collected and mixed in the tank, preventing the presence of salt and loose sludge from concentrated boiler water in the small amounts of continuous and scheduled discharge. This ensures better overall water quality, avoiding waste if directly discharged into the sewage system. The industrial water pipe carries ambient temperature industrial water, which can be centrally recycled for reuse. The wastewater discharge and cooling tank is connected to another industrial water supply line. During continuous operation, 15t / h of ambient temperature industrial water is continuously added to the tank and mixed with hot water to cool the wastewater to below 40°C. The wastewater lift pump pumps lift and transport the water in the tank to maintain normal wastewater discharge and cooling. The wastewater level in the pool is controlled by a two-way connection between the outlet pipe of the wastewater lifting pump and the wastewater level in the pool. One line is a conventional wastewater pipeline that enters the wastewater system for treatment. The other line connects to the plant's circulating water return network and enters the circulating water pool for recycling, thereby reducing the amount of industrial water replenishment to the circulating water pool. During normal production operation, the wastewater from the boiler wastewater cooling pool is pumped into the circulating water return network and enters the circulating water pool for recycling. The wastewater pipeline valve is closed and is only used as an emergency backup in case of abnormal operating conditions. When the wastewater inside the wastewater cooling pool passes through the U-shaped pipe 11 of the wastewater lifting component 1, it can be collected in the bottom sedimentation tank 14 through the central pipe 13. The filter screen 18 in the inner liner 16, together with the baffle 17 structure, isolates some clumps and impurities in the wastewater. The wastewater is then pumped out by the pump 110 inside the return water pipe 19 and enters the treatment tank 111 for adsorption. The treated water is then returned to the overall process.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PTA boiler periodic blowdown device, comprising a blowdown cooling tank, an industrial water pipe, a blowdown lift pump, and a blowdown lift assembly (1), characterized in that: The wastewater discharge and cooling pool is divided into two routes. One route is a conventional sewage pipeline, and the other route is connected to the plant's circulating water network and enters the circulating water pool. The wastewater discharge and cooling pool is connected to the boiler emergency discharge, deaerator discharge, feedwater tank discharge, economizer discharge, superheater condensate, continuous drainage and constant drainage, and is connected to the wastewater discharge and cooling pool through an expansion container. The industrial water pipe is a single line for producing industrial water at ambient temperature, and this line is connected to the wastewater cooling pool. The water channel of the sewage cooling pool is lifted by the sewage lifting component (1), and the sewage lifting component (1) is connected to a fixed discharge expansion container and connected to a continuous discharge expansion container by an industrial water pipe.

2. The PTA boiler periodic blowdown device according to claim 1, characterized in that: The sewage lifting assembly (1) includes a lifting pump (12) for lifting sewage cooling pools. A U-shaped pipe (11) is fixedly installed on the outside of the lifting pump (12), and the sewage cooling pools are all connected through the U-shaped pipe (11).

3. The PTA boiler periodic blowdown device according to claim 2, characterized in that: The lowest end of the U-shaped tube (11) is connected to a central tube (13). A sealing tube (15) is sleeved on the outside of the connection between the U-shaped tube (11) and the central tube (13). A bottom sedimentation tank (14) is fixedly installed at the bottom end of the central tube (13). An inner liner (16) is fixedly installed inside the bottom sedimentation tank (14). A partition (17) is fixedly installed at the top of the inner liner (16) and is fixedly installed with the central tube (13).

4. A PTA boiler periodic blowdown device according to claim 3, characterized in that: A filter screen (18) is fixedly installed on the left side of the top opening of the inner liner (16) and is fixedly installed with the partition (17).

5. A PTA boiler periodic blowdown device according to claim 3, characterized in that: Both sides of the inner liner (16) are connected to a return water pipe (19) that passes through the bottom sedimentation tank (14), and the other end of the return water pipe (19) is fixedly provided with a treatment box (111).

6. A PTA boiler periodic blowdown device according to claim 5, characterized in that: A pump (110) is fixedly installed inside the return water pipe (19).

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