Circulating system for sewage pretreatment

Abstract

A circulating system for sewage pretreatment comprises a mechanical seal water system, an accident water system and a low-pressure steam system, the mechanical seal water system comprises a mechanical seal water cooler, a mechanical seal water tank and at least nine heat exchangers, the accident water system comprises an accident pool and a water diversion tank, and the low-pressure steam system comprises a low-pressure steam header pipe and an instrument air header pipe. According to the mechanical seal water system, the accident water system and the low-pressure steam system, circulating cooling water, mechanical seal water, instrument air, low-pressure steam and industrial water are repeatedly utilized through pipeline setting, more high-salinity waste water can be treated through the same raw materials, the system is more perfect, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to desalination technical field, concretely is a kind of sewage pretreatment's circulation system. BACKGROUND

[0002] In chemical industry, hazardous waste incineration, petroleum refining, textile and food processing industries, high-salinity wastewater is usually generated in the production process. These high-salinity wastewater contains high concentrations of salts, including sodium chloride, sodium sulfate, sodium nitrate and various organic and inorganic compounds. If these wastewater is directly discharged, it will have a certain impact on the environment.

[0003] Currently, the main technologies applied to such high-salinity wastewater include mechanical vapor recompression (MVR) and multiple-effect evaporation (MED). Both of these technologies are based on evaporation principles. In existing technologies, three-effect evaporation technology is generally used. The flash evaporation equipment and four-effect evaporation equipment in the three-effect evaporation system require a large amount of circulating cooling water and low-pressure steam. If they are not reasonably installed and designed, a large amount of circulating cooling water and low-pressure steam will be wasted, resulting in increased costs of wastewater treatment and decreased economic efficiency. SUMMARY

[0004] The utility model aims to provide a kind of sewage pretreatment's circulation system, to solve the above technical problems, the machine seal water system, accident water system and low-pressure steam system of the utility model are repeatedly used circulating cooling water, machine seal water, instrument air, low-pressure steam and industrial water by pipeline setting, so that the same raw material can treat more high-salinity wastewater, make system more perfect, improve production efficiency.

[0005] To achieve the above-mentioned purpose, the utility model realizes the following technical solutions:

[0006] A sewage pretreatment's circulation system, comprising a machine seal water system, an accident water system and a low-pressure steam system, the machine seal water system comprises a machine seal water cooler, a machine seal water tank and at least nine heat exchangers, the accident water system comprises an accident pool and a water intake tank, and the low-pressure steam system comprises a low-pressure steam main pipe and an instrument air main pipe.

[0007] Further, the circulating cooling water inlet of the machine seal water cooler is connected to the circulating cooling water pipe through a pipeline, the machine seal water inlet of the machine seal water cooler is connected to the heat exchanger through a pipeline, the machine seal water outlet of the machine seal water cooler is connected to the machine seal water tank through a pipeline, the circulating cooling water pipe delivers circulating cooling water to a plurality of circulating cooling water water users through a pipeline, and the plurality of circulating cooling water water users deliver the circulating cooling water back to the circulating cooling water pipe through a pipeline. The plurality of circulating cooling water water users include a centrifugal separator, a flash condenser and a four-effect condenser.

[0008] Further, the industrial water outlet of the machine seal water tank is connected with the industrial water main through a pipeline, and the machine seal water outlet of the machine seal water tank is connected with the heat exchanger through a pipeline, and a metal hose is used at the connection of the heat exchanger, the metal hose has good corrosion resistance, can resist various corrosion factors, and ensures the normal operation and service life of the pipeline system.

[0009] Further, the industrial water inlet of the accident pool is connected with the industrial water main through a pipeline, the waste water outlet of the accident pool is connected with the water guide tank through a pipeline, and the industrial water main is connected with a plurality of industrial water places through a pipeline.

[0010] Further, the industrial water inlet of the water guide tank is connected with the industrial water main through a pipeline, and the waste water outlet of the water guide tank is connected with the four-effect circulating pipe through a pipeline.

[0011] Further, the secondary steam outlet of the low-pressure steam main is connected with a plurality of steam-using places through a pipeline, and the discharge of the low-pressure steam main is provided with a vent through a pipeline, and the plurality of steam-using places include the first heater, the steam preheater and the purge pipeline.

[0012] Further, the instrument air outlet of the instrument air main is connected with at least three air-using points through a pipeline, and a pressure gauge is arranged between the instrument air main and the air-using points.

[0013] Further, a machine seal water pump and a pressure gauge are arranged between the machine seal water cooler and the machine seal water tank, and a pressure gauge and a thermometer are arranged between the circulating cooling water pipe and a plurality of circulating cooling water places, and the machine seal water pump is used for conveying machine seal water to the machine seal water tank.

[0014] Further, a liquid level transmitter and a vent pipeline are arranged on the accident pool, and a steam condensate purger, an accident pool pump and a pressure gauge are arranged between the water guide tank and the four-effect circulating pipe, and the accident pool pump is used for conveying waste water in the water guide tank to the four-effect circulating pipe, and the steam condensate purger is used for cleaning the pipeline.

[0015] Further, a pressure gauge, a thermometer, a vortex flowmeter and a vacuum regulating valve are arranged between the low-pressure steam main and a plurality of steam-using places, and a Y-shaped filter and a trap are arranged between the low-pressure steam main and the vent.

[0016] The utility model discloses a kind of sewage pretreatment's circulation system, with the following beneficial effects:

[0017] 1. The utility model relates to a circulating system for sewage pretreatment, which lowers the temperature of the machine sealing water through a machine sealing water cooler, so that the machine sealing water can better play its cooling and lubricating role at the heat exchanger, and the circulating cooling water can be reused, so that the system is more perfect and the production efficiency is improved.

[0018] 2. The utility model relates to a circulating system for sewage pretreatment, which reuses instrument air, low-pressure steam and industrial water through pipeline setting in the accident water system and low-pressure steam system, reduces the consumption of raw materials, and allows the same raw materials to treat more high-salinity wastewater.

[0019] 3. The utility model relates to a circulating system for sewage pretreatment, which is equipped with various data detection meters and various valves on each system, so that the system is more perfect, no one needs to be on site at all times, labor consumption is reduced, and cost reduction and efficiency increase are achieved.

[0020] 4. The utility model relates to a circulating system for sewage pretreatment, which has a running cycle of 4 months, and the heat exchange efficiency does not decrease significantly after 4 months of operation, which greatly improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole system structure schematic view of the utility model of a circulating system for sewage pretreatment.

[0022] Figure 2 It is a machine sealing water system structure schematic view of the utility model of a circulating system for sewage pretreatment.

[0023] Figure 3 It is an accident water system structure schematic view of the utility model of a circulating system for sewage pretreatment.

[0024] Figure 4 It is a low-pressure steam system structure schematic view of the utility model of a circulating system for sewage pretreatment.

[0025] Figure 5 It is a pipeline code indication diagram of the utility model of a circulating system for sewage pretreatment. DETAILED DESCRIPTION

[0026] In order to make the personnel in the technical field better understand the technical scheme of the utility model, the utility model product is further described in detail below in combination with the embodiments and the drawings.

[0027] It is to be understood that where an element such as a layer, region or substrate is described as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element is described as being "connected" or "coupled" to another element, it can be directly connected or coupled or intervening elements can be present. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , a circulating system for sewage pretreatment includes a machine seal water system, an emergency water system and a low pressure steam system, the machine seal water system includes a machine seal water cooler 1, a machine seal water tank 2 and at least nine heat exchangers 3, the emergency water system includes an emergency pool 6 and a water guide tank 13, and the low pressure steam system includes a low pressure steam main pipe 17 and an instrument air main pipe 24.

[0030] As shown in Figure 1 , Figure 2 and Figure 5 , the circulating cooling water inlet of the machine seal water cooler 1 is connected to the circulating cooling water pipe 4 through a pipeline, the machine seal water inlet of the machine seal water cooler 1 is connected to the heat exchanger 3 through a pipeline, the machine seal water outlet of the machine seal water cooler 1 is connected to the machine seal water tank 2 through a pipeline, the circulating cooling water pipe 4 delivers circulating cooling water to a plurality of circulating cooling water water users through a pipeline, and the plurality of circulating cooling water water users deliver circulating cooling water back to the circulating cooling water pipe 4 through a pipeline, the plurality of circulating cooling water water users include a centrifugal separator 12, a flash condenser 11 and a four-effect condenser 10.

[0031] As shown in Figure 1 , Figure 2 and Figure 5 , the industrial water outlet of the machine seal water tank 2 is connected to the industrial water main pipe 5 through a pipeline, the machine seal water outlet of the machine seal water tank 2 is connected to the heat exchanger 3 through a pipeline, and a metal hose is used at the connection of the heat exchanger 3, the metal hose has good corrosion resistance, can resist various corrosion factors, and can ensure the normal operation and service life of the pipeline system.

[0032] As shown in Figure 1 , Figure 3 and Figure 5 , the industrial water inlet of the accident pool is connected with the industrial water main 5 through a pipeline, the waste water outlet of the accident pool 6 is connected with the water guide tank 13 through a pipeline, the industrial water main 5 is connected with several industrial water places through a pipeline, and the several industrial water places include the accident pool 6, the vacuum water separation tank 8, the condensate water tank 9 and the spraying water supplement place 7.

[0033] As shown in Figure 1 , Figure 3 and Figure 5 , the industrial water inlet of the water guide tank 13 is connected with the industrial water main 5 through a pipeline, and the waste water outlet of the water guide tank 13 is connected with the four-effect circulation pipe 16 through a pipeline.

[0034] As shown in Figure 1 , Figure 4 and Figure 5 , the secondary steam outlet of the low-pressure steam main 17 is connected with several steam-using places through a pipeline, and the discharge place of the low-pressure steam main 17 is provided with a vent 21 through a pipeline, and the several steam-using places include the first-effect heater 18, the steam preheater 19 and the purge pipeline 20.

[0035] As shown in Figure 1 , Figure 4 and Figure 5 , the instrument air outlet of the instrument air main 24 is connected with at least three air-using points 25 through a pipeline, and a pressure gauge 26 is arranged between the instrument air main 24 and the air-using points 25.

[0036] As shown in Figure 1 , Figure 2 and Figure 5 , a mechanical seal water pump 29 and a pressure gauge 26 are arranged between the mechanical seal water cooler 1 and the mechanical seal water tank 2, and a pressure gauge 26 and a thermometer 27 are arranged between the circulating cooling water pipe 4 and several circulating cooling water-using places, and the mechanical seal water pump 29 is used for conveying the mechanical seal water to the mechanical seal water tank 2.

[0037] As shown in Figure 1 , Figure 3 and Figure 5 , a liquid level transmitter 28 and a vent pipeline are arranged on the accident pool 6, and a steam condensate water purger 15, an accident pool pump 14 and a pressure gauge 26 are arranged between the water guide tank 13 and the four-effect circulation pipe 16. The accident pool pump 14 is used for conveying the waste water in the water guide tank 13 to the four-effect circulation pipe 16, and the steam condensate water purger 15 is used for cleaning the pipeline.

[0038] As shown in Figure 1 , Figure 2 , Figure 3、 Figure 4 and Figure 5 As shown in the figure, the low-pressure steam main 17 is provided with a pressure gauge 26, a thermometer 27, a vortex flowmeter 31 and a vacuum regulating valve 30 between the low-pressure steam main 17 and the steam users, and is provided with a Y-type filter 22 and a trap 23 between the low-pressure steam main 17 and the exhaust port 21.

[0039] It should be noted that in the embodiment, the circulating cooling water flowing out of the circulating cooling water pipe 4 first passes through the pipeline to the seal water cooler 1, and then passes through the pipeline to return to the circulating cooling water pipe 4 to form a circulating cooling water circulation, which acts on the seal water cooler 1 and a plurality of circulating cooling water water users, such as the centrifugal separator 12, the flash condenser 11 and the four-effect condenser 10, and provides cooling medium for the circulating cooling water, and the seal water used by the heat exchanger 3 is too high in temperature, so that the seal water is cooled by the seal water cooler 1, and after cooling, the seal water is stored in the seal water tank 2 by the seal water pump 29 and the pipeline, and when needed, the seal water is transferred to the heat exchanger 3 by the pipeline to form a seal water circulation, and the industrial water required in the industrial water system is provided by the industrial water main 5 through the pipeline; in the emergency water system, the industrial water required by the emergency pool 6 and the water tank 13 is transported from the pipeline by the industrial water main 5, and the high-salt waste water of the emergency pool 6 is transported to the water tank 13 by the pipeline, and the water tank 13 transports the high-salt waste water to the four-effect circulating pipe 16 by the emergency pool 6 pump and the pipeline; in the low-pressure steam system, the low-pressure steam required by various steam users is provided by the low-pressure steam main 17 through the pipeline, and when the low-pressure steam is not needed, the low-pressure steam can be discharged to the exhaust port 21 by the Y-type filter 22 and the trap 23, and the instrument air required by the instrument air point 25 is provided by the instrument air main 24.

[0040] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any ordinary technical personnel in the industry can implement the present application according to the above description and the drawings; however, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application; meanwhile, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application.

Claims

1. A recirculating system for pretreatment of sewage, characterized in that: The system comprises a seal water system, an emergency water system and a low pressure steam system, the seal water system comprises a seal water cooler, a seal water tank and at least nine heat exchangers, the emergency water system comprises an emergency pool and a water supply tank, and the low pressure steam system comprises a low pressure steam main and an instrument air main.

2. A recirculating system for the pretreatment of sewage according to claim 1, characterised in that: The circulating cooling water inlet of the seal water cooler is connected with a circulating cooling water pipe through a pipeline, the seal water inlet of the seal water cooler is connected with a heat exchanger through a pipeline, the seal water outlet of the seal water cooler is connected with the seal water tank through a pipeline, and the circulating cooling water pipe sends circulating cooling water to a plurality of circulating cooling water water users through a pipeline, and the circulating cooling water water users send the circulating cooling water back to the circulating cooling water pipe through a pipeline.

3. A recirculating system for the pretreatment of sewage according to claim 1, characterised in that: The industrial water outlet of the seal water tank is connected with an industrial water main through a pipeline, the seal water outlet of the seal water tank is connected with a heat exchanger through a pipeline, and the connection of the heat exchanger adopts a metal hose.

4. A recirculating system for the pretreatment of sewage according to claim 3, characterised in that: The industrial water inlet of the emergency pool is connected with an industrial water main through a pipeline, the waste water outlet of the emergency pool is connected with the water supply tank through a pipeline, and the industrial water main is connected with a plurality of industrial water users through a pipeline.

5. A recirculating system for the pretreatment of sewage according to claim 4, characterised in that: The industrial water inlet of the water supply tank is connected with an industrial water main through a pipeline, and the waste water outlet of the water supply tank is connected with a four-effect circulating pipe through a pipeline.

6. A recirculating system for the pretreatment of sewage according to claim 1, wherein: The secondary steam outlet of the low pressure steam main is connected with a plurality of steam users through a pipeline, and the discharge of the low pressure steam main is provided with a vent through a pipeline.

7. A recirculating system for the pretreatment of sewage according to claim 1, wherein: The instrument air outlet of the instrument air main is connected with at least three air users through a pipeline, and a pressure gauge is arranged between the instrument air main and the air users.

8. A recirculating system for the pretreatment of sewage according to claim 2, wherein: A seal water pump and a pressure gauge are arranged between the seal water cooler and the seal water tank, and a pressure gauge and a thermometer are arranged between the circulating cooling water pipe and a plurality of circulating cooling water water users.

9. A recirculating system for the pretreatment of sewage according to claim 4, wherein: A liquid level transmitter and a vent pipeline are arranged on the emergency pool, and a steam condensate purger, an emergency pool pump and a pressure gauge are arranged between the water supply tank and the four-effect circulating pipe.

10. A recirculating system for the pretreatment of sewage according to claim 6, characterised in that: A pressure gauge, a thermometer, a vortex flowmeter and a vacuum regulating valve are arranged between the low pressure steam main and a plurality of steam users, and a Y-type filter and a trap are arranged between the low pressure steam main and the vent.

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