Preheating system for sewage pretreatment

Abstract

A preheating system for sewage pretreatment relates to the related technical field of sewage treatment and comprises a sewage condensate water preheater, a sewage condensate water tank and a steam condensate water preheater, a wastewater inlet of the sewage condensate water preheater is connected with a sewage device, a wastewater outlet of the sewage condensate water preheater is connected with a wastewater inlet of the steam condensate water preheater, and a wastewater outlet of the steam condensate water preheater is connected with a wastewater outlet of the sewage condensate water tank. And a wastewater outlet of the steam condensate preheater is connected with the steam preheater. By arranging the four-effect condenser, the dirty condensate water preheater, the vacuum water cooler, the condensate water cooler, the steam condensate water preheater and the like, the treatment capacity of high-salinity wastewater and dirty condensate water is improved, various water pumps and various detectors are additionally arranged on each system, so that the system is more perfect, the labor consumption is reduced, and the working efficiency is improved. And the economic performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to sewage treatment, in particular to a preheating system for sewage pretreatment. Background Art

[0002] In industries such as chemical processing, hazardous waste incineration, petroleum refining, textiles, and food processing, high-salt wastewater and contaminated condensate are commonly generated during production. These high-salt wastewaters contain high concentrations of salt, generally including various organic and inorganic compounds such as sodium chloride, sodium sulfate, and sodium nitrate. Condensate is mainly used to cool equipment. If these wastewaters are discharged directly, they will have a certain impact on the environment. With the development of science and technology, society's requirements for environmental protection are becoming increasingly stringent, and a series of new environmental protection policies and regulations have been continuously introduced. The treatment of high-salt wastewater containing sodium sulfate and contaminated condensate has become a major factor restricting the development of some industries. At present, the treatment effect of most high-salt wastewater containing sodium sulfate and contaminated condensate is not ideal, the system structure is not perfect, and production efficiency is low. Utility Model Content

[0003] The purpose of this utility model is to provide a preheating system for sewage pretreatment, aiming to solve the above technical problems. The utility model improves the treatment capacity of high-salt wastewater and sewage condensate by providing a four-effect condenser, a sewage condensate preheater, a vacuum water cooler, a condensate cooler and a steam condensate preheater, and by adding various water pumps and various detectors to each system, the system is made more perfect, labor consumption is reduced, and economic performance is improved.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A preheating system for sewage pretreatment includes a sewage condensate preheater, a sewage condensate tank and a steam condensate preheater, wherein the wastewater inlet of the sewage condensate preheater is connected to a sewage device, the wastewater outlet of the sewage condensate preheater is connected to the wastewater inlet of the steam condensate preheater, and the wastewater outlet of the steam condensate preheater is connected to the steam preheater.

[0006] Furthermore, the condensed water inlet of the condensed water preheater is connected to the condensed water outlet of the condensed water tank, the condensed water outlet of the four-effect condenser and the condensed water outlet of the flash condenser. The condensed water outlet of the condensed water preheater is connected to the condensed water inlet of the condensed water cooler. The condensed water outlet of the condensed water cooler is connected to the condensed water storage tank. The condensed water preheater increases the temperature of the condensed water entering the system through a heat exchange process, thereby enhancing the thermal efficiency and energy-saving effect of the system.

[0007] Furthermore, the waste condensed water inlet of the waste condensed water tank is connected to the four-effect heater, the saturated steam condensed water inlet of the waste condensed water tank is connected to the steam preheater, and the secondary steam inlet of the waste condensed water tank is connected to the four-effect heater.

[0008] Furthermore, the secondary steam inlet of the four-effect condenser is connected to the four-effect crystallizer, the non-condensable steam outlet of the four-effect condenser is connected to the non-condensable steam inlet of the vacuum water separation tank through a vacuum pump, the cooling water inlet of the four-effect condenser is connected to the cooling water main pipe, and the cooling water outlet of the four-effect condenser is connected to the cooling water reflux pipe. The four-effect condenser can condense high-temperature and high-pressure gas or steam into low-temperature and low-pressure liquid.

[0009] Furthermore, the non-condensable steam outlet of the vacuum water separation tank is connected to the tail gas treatment system, the industrial wastewater inlet of the vacuum water separation tank is connected to the industrial wastewater outlet of the vacuum water cooler via a vacuum pump, one industrial wastewater outlet of the vacuum water separation tank is connected to the industrial wastewater inlet of the vacuum water cooler, the other industrial wastewater outlet of the vacuum water separation tank is connected to the industrial wastewater discharge pipe, and the production water inlet of the vacuum water separation tank is connected to the production water supply pipe. The vacuum water separation tank can fully separate and filter liquids, achieving separation and filtration of industrial wastewater.

[0010] Furthermore, the non-condensable steam inlet of the vacuum water separation tank is also connected to the flash condenser through a vacuum pump.

[0011] Furthermore, the process wastewater outlet of the vacuum water cooler is connected to the vacuum pump; the cooling water inlet of the vacuum water cooler is connected to the cooling water main pipe, and the cooling water outlet of the vacuum water cooler is connected to the cooling water reflux pipe.

[0012] Furthermore, the cooling water inlet of the condensing water cooler is connected to the cooling water main pipe, and the cooling water outlet of the condensing water cooler is connected to the cooling water return pipe.

[0013] Furthermore, the saturated steam condensate inlet of the steam condensate preheater is connected to the condensate tank through a condensate pump, and the saturated steam condensate outlet of the steam condensate preheater is connected to the fresh steam condensate main pipe.

[0014] Furthermore, the condensed water tank is also connected to a flushing pipeline through a condensed water pump.

[0015] The utility model provides a preheating system for sewage pretreatment, which has the following beneficial effects:

[0016] The preheating system for sewage pretreatment of the utility model is equipped with a sewage condensate preheater and a steam condensate preheater, which can preheat and increase the temperature of sodium sulfate wastewater, making the sodium sulfate wastewater easier to concentrate in subsequent treatment processes, and effectively improving the treatment efficiency of sodium sulfate wastewater;

[0017] The preheating system for sewage pretreatment of the utility model is further provided with a sewage condensate tank and a four-effect condenser. The four-effect condenser can be used to transport secondary steam to the sewage condensate tank, and the secondary steam can be used to heat the sewage condensate in the sewage condensate tank, and the sodium sulfate wastewater can be heated by heat exchange through the sewage condensate preheater, thereby fully utilizing the waste heat of the sewage condensate, achieving the purpose of energy saving and emission reduction, and improving economic benefits.

[0018] The preheating system for sewage pretreatment of the utility model is not only provided with a preheating system for sodium sulfate wastewater, but also provided with a heat exchange treatment system for secondary steam, sewage condensate, saturated steam condensate, etc., which makes full use of the residual heat in various wastewaters or steam. Compared with the traditional system for simply treating sodium sulfate wastewater, it is more perfect, and is provided with instruments and equipment for monitoring various parameter data, so that the status of each pipeline can be observed at any time. There is no need for manual monitoring of the system at all times, which reduces labor consumption and is conducive to reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the preheating system for sewage pretreatment of the present utility model. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below with reference to the embodiments and accompanying drawings.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] like Figure 1As shown, a preheating system for sewage pretreatment includes a sewage condensate preheater 1, a sewage condensate tank 7 and a steam condensate preheater 2. The wastewater inlet of the sewage condensate preheater 1 is connected to the sewage device 8, the wastewater outlet of the sewage condensate preheater 1 is connected to the wastewater inlet of the steam condensate preheater 2, and the wastewater outlet of the steam condensate preheater 2 is connected to the steam preheater 20. A flow regulating valve is provided between the sewage condensate preheater 1 and the sewage device 8, and the inflow of high-salt wastewater can be controlled by the flow regulating valve.

[0024] like Figure 1 As shown, the condensed water inlet of the condensed water preheater 1 is connected to the condensed water outlet of the condensed water tank 7, the condensed water outlet of the four-effect condenser 6 and the condensed water outlet of the flash condenser 15, the condensed water outlet of the condensed water preheater 1 is connected to the condensed water inlet of the condensed water cooler 3, and the condensed water outlet of the condensed water cooler 3 is connected to the condensed water storage tank 9. The condensed water preheater 1 increases the temperature of the condensed water entering the system through a heat exchange process, thereby enhancing the thermal efficiency and energy-saving effect of the system.

[0025] It should be noted that: in this embodiment, a waste condensate pump and a pressure gauge are provided between the waste condensate preheater 1 and the waste condensate tank 7, and the waste condensate pump and the pressure gauge can be used to monitor the working effect of the waste condensate flowing to the waste condensate tank 7 in real time; a liquid level regulating valve, a flow transmitter and a thermometer are provided between the condensate cooler 3 and the condensate storage tank 9, and the liquid level transmitter and the thermometer can detect whether the cooling water meets the flow and temperature requirements. If not, the working condition can be adjusted by adjusting the liquid level regulating valve.

[0026] like Figure 1 As shown, the dirty condensed water inlet of the dirty condensed water tank 7 is connected to the four-effect heater 19, the saturated steam condensed water inlet of the dirty condensed water tank 7 is connected to the steam preheater 20, and the secondary steam inlet of the dirty condensed water tank 7 is connected to the four-effect heater 19.

[0027] like Figure 1 As shown, the secondary steam inlet of the four-effect condenser 6 is connected to the four-effect crystallizer 16, the non-condensable steam outlet of the four-effect condenser 6 is connected to the non-condensable steam inlet of the vacuum water separation tank 4 through the vacuum pump 17, the cooling water inlet of the four-effect condenser 6 is connected to the cooling water main pipe 14, and the cooling water outlet of the four-effect condenser 6 is connected to the cooling water reflux pipe 13. The four-effect condenser 6 can condense high-temperature and high-pressure gas or steam into low-temperature and low-pressure liquid.

[0028] like Figure 1As shown, the non-condensable steam outlet of the vacuum water separation tank 4 is connected to the tail gas treatment system 12, the industrial wastewater inlet of the vacuum water separation tank 4 is connected to the industrial wastewater outlet of the vacuum water cooler 5 through a vacuum pump 17, one outlet of the industrial wastewater of the vacuum water separation tank 4 is connected to the industrial wastewater inlet of the vacuum water cooler 5, the other outlet of the industrial wastewater of the vacuum water separation tank 4 is connected to the industrial wastewater discharge pipe 10, and the production water inlet of the vacuum water separation tank 4 is connected to the production water supply pipe 11. In this embodiment, industrial wastewater can be transported to the vacuum water separation tank 4 through other equipment and pipelines. When the vacuum water separation tank 4 is in working state, the industrial wastewater enters the vacuum water cooler 5 from the vacuum water separation tank 4 for heat exchange cooling and cooling. The cooled industrial wastewater is then input into the vacuum water separation tank 4 through the vacuum pump 17 for circulation operation. When the vacuum water separation tank 4 does not need industrial wastewater for operation, the industrial wastewater can be discharged through the industrial wastewater discharge pipe 10.

[0029] like Figure 1 As shown, the non-condensable steam inlet of the vacuum water separation tank 4 is also connected to the flash condenser 15 through a vacuum pump 17 .

[0030] like Figure 1 As shown, the process wastewater outlet of the vacuum water cooler 5 is connected to the vacuum pump 17; the cooling water inlet of the vacuum water cooler 5 is connected to the cooling water main pipe 14, and the cooling water outlet of the vacuum water cooler 5 is connected to the cooling water return pipe 13.

[0031] like Figure 1 As shown, the cooling water inlet of the condensed water cooler 3 is connected to the cooling water main pipe 14 , and the cooling water outlet of the condensed water cooler 3 is connected to the cooling water return pipe 13 .

[0032] like Figure 1 As shown, the saturated steam condensate inlet of the steam condensate preheater 2 is connected to the condensate tank 22 via a condensate pump 18, and the saturated steam condensate outlet of the steam condensate preheater 2 is connected to the fresh steam condensate main pipe 23. The condensate tank 22 is also connected to the flushing pipe 21 via the condensate pump 18. A condensate pump and a pressure gauge are provided between the condensate tank 22 and the steam condensate preheater 2, and a liquid level regulating valve is provided between the steam condensate preheater 2 and the fresh steam condensate main pipe 23. The condensate pump, pressure gauge, and liquid level regulating valve can all monitor the operating status of the system in real time, making the system more complete, enabling real-time adjustment of the operating status, and improving the operating efficiency of the system.

[0033] It should be noted that: in this embodiment, the high-salt water wastewater is discharged from the sewage device 8 into the sewage condensate preheater 1 through a pipeline, and then to the steam condensate preheater 2 through a pipeline for preheating treatment. The preheated high-salt water wastewater is sent to the steam preheater 20 through a pipeline for subsequent processing, and the steam condensate preheater 2 can also preheat the condensate in the condensate tank 22 at the same time; the vacuum water separation tank 4 is connected in a loop with the vacuum pump 17, the four-effect cooler and the flash condenser 15 provide non-condensable steam to the vacuum water separation tank 4 through a pipeline, the production water supply pipe 11 provides production water to the vacuum separation tank, and the non-condensable gas is discharged to the tail gas treatment system 12 after separation in the vacuum water separation tank 4, and the separation The separated industrial waste water is discharged into the drain port 10 through the separation tank pipeline. The cooling water required by the vacuum water cooler 5 is provided by the cooling water main pipe 14 and the cooling water return pipe 13. The cooling water of the four-effect cooler is connected by the cooling water main pipe 14 and the cooling water return pipe 13 through a pipeline circulation loop; the dirty condensed water tank 7 also contains saturated steam condensed water transferred from the steam preheater 20 through a pipeline, and then the dirty condensed water of the four-effect cooler is transferred to the dirty condensed water inlet of the dirty condensed water preheater 1 through a pipeline for preheating. After the preheating is completed, it is cooled through a pipeline to the condensed water cooler 3 to obtain reusable condensed water, which can be stored in the condensed water storage tank 9 through the pipeline for subsequent use.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention still belong to the technical solution of the present invention.

Claims

1. A preheating system for sewage pretreatment, characterized by: It includes a dirty condensate preheater, a dirty condensate tank and a steam condensate preheater, the wastewater inlet of the dirty condensate preheater is connected to the sewage device, the wastewater outlet of the dirty condensate preheater is connected to the wastewater inlet of the steam condensate preheater, and the wastewater outlet of the steam condensate preheater is connected to the steam preheater; The dirty condensed water inlet of the dirty condensed water preheater is connected to the dirty condensed water outlet of the dirty condensed water tank, the dirty condensed water outlet of the four-effect condenser, and the dirty condensed water outlet of the flash condenser. The dirty condensed water outlet of the dirty condensed water preheater is connected to the dirty condensed water inlet of the condensed water cooler, and the dirty condensed water outlet of the condensed water cooler is connected to the condensed water storage tank. The dirty condensed water inlet of the dirty condensed water tank is connected to the four-effect heater, the saturated steam condensed water inlet of the dirty condensed water tank is connected to the steam preheater, and the secondary steam inlet of the dirty condensed water tank is connected to the four-effect heater; The secondary steam inlet of the four-effect condenser is connected to the four-effect crystallizer, the non-condensable steam outlet of the four-effect condenser is connected to the non-condensable steam inlet of the vacuum water separation tank through a vacuum pump, the cooling water inlet of the four-effect condenser is connected to the cooling water main pipe, and the cooling water outlet of the four-effect condenser is connected to the cooling water reflux pipe.

2. A preheating system for sewage pretreatment according to claim 1, characterized in that: The non-condensable steam outlet of the vacuum water separation tank is connected to the tail gas treatment system, the industrial wastewater inlet of the vacuum water separation tank is connected to the industrial wastewater outlet of the vacuum water cooler through a vacuum pump, one industrial wastewater outlet of the vacuum water separation tank is connected to the industrial wastewater inlet of the vacuum water cooler, the other industrial wastewater outlet of the vacuum water separation tank is connected to the industrial wastewater discharge pipe, and the production water inlet of the vacuum water separation tank is connected to the production water supply pipe.

3. A preheating system for sewage pretreatment according to claim 2, characterized in that: The non-condensable steam inlet of the vacuum water separation tank is also connected to the flash condenser through a vacuum pump.

4. A preheating system for sewage pretreatment according to claim 3, characterized in that: The process wastewater outlet of the vacuum water cooler is connected to the vacuum pump; the cooling water inlet of the vacuum water cooler is connected to the cooling water main pipe; and the cooling water outlet of the vacuum water cooler is connected to the cooling water reflux pipe.

5. The preheating system for sewage pretreatment according to claim 4, characterized in that: The cooling water inlet of the condensing water cooler is connected to the cooling water main pipe, and the cooling water outlet of the condensing water cooler is connected to the cooling water return pipe.

6. The preheating system for sewage pretreatment according to claim 5, characterized in that: The saturated steam condensate inlet of the steam condensate preheater is connected to the condensate tank through a condensate pump, and the saturated steam condensate outlet of the steam condensate preheater is connected to the fresh steam condensate main pipe.

7. The preheating system for sewage pretreatment according to claim 6, characterized in that: The condensed water tank is also connected to the flushing pipeline through a condensed water pump.

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