A method and system for treating high temperature boiler wastewater

Abstract

The application discloses a boiler high-temperature wastewater treatment method, which comprises the following steps: collecting wastewater, cooling the collected wastewater, and discharging the cooled wastewater, wherein the cooling step comprises cooling the wastewater by mixing normal-temperature industrial water with the wastewater; and the discharging step comprises discharging the cooled wastewater into a desulfurization process water tank and a plant circulating water system. The application solves the problem that the treatment of boiler high-temperature wastewater is relatively complex in the prior art.

Description

Technical Field

[0001] This invention relates to a method for treating high-temperature wastewater from boilers.

[0002] The present invention also relates to a treatment system for high-temperature wastewater from boilers. Background Technology

[0003] During steam production, boilers require continuous chemical dosing to ensure steam quality. As the water evaporates, inorganic salt residues and other impurities from the chemical reactions of the chemicals accumulate, necessitating timely discharge to maintain steam quality. This discharged boiler wastewater is typically at high temperature and pressure, exceeding 200 degrees Celsius. After undergoing expansion, pressure reduction, and flash evaporation using specialized equipment, steam is discharged from the top of the equipment. Large quantities of this high-temperature wastewater are usually discharged into sewage ditches or ponds and then naturally cooled before being released. This directly discharged boiler wastewater accounts for approximately 2% of the boiler's evaporation capacity. Assuming a 460T / H boiler operates for 8000 hours annually, the annual wastewater discharge from a single boiler reaches approximately 73,600 tons.

[0004] Chinese patent document CN116877977A discloses a boiler blowdown wastewater waste heat recovery system and method, including a blowdown pool and a cooling pool. The blowdown pool is connected to an inlet pipe of a vacuum priming tank A, and the outlet pipe of the vacuum priming tank A is connected to a heat exchange wastewater pump. The heat exchange wastewater pump is connected to a hot-side inlet header of a heat exchanger, and the hot-side outlet pipe of the heat exchanger is connected to the cooling pool. The cooling pool is connected to an inlet pipe of a vacuum priming tank B, and the outlet pipe of the vacuum priming tank B is connected to an inlet pipe of a water pump. The water pump has two outlet pipes, one connected to a cooling wastewater pipe and the other connected to the blowdown pool. The cold-side inlet pipe of the heat exchanger is connected to an outlet pipe of a makeup water pump, and the cold-side outlet header of the heat exchanger is connected to a boiler makeup water pipe. The inlet pipe of the makeup water pump is connected to a makeup water collection tank. This existing technology uses a heat exchanger to transfer heat from 95°C boiler blowdown wastewater to the feedwater. After the feedwater temperature rises, it is transported to the boiler feedwater pipe through the cold-end outlet header, and finally fed into the boiler for use. Once the boiler blowdown wastewater temperature drops below 40°C, it flows into a cooling tank through the hot-end outlet header, and is then discharged through the cooling wastewater pipe by a pump. This eliminates the need to directly add water to the boiler blowdown wastewater for cooling, utilizing the waste heat generated by the boiler blowdown wastewater, reducing wastewater production, ensuring the wastewater inlet temperature meets the requirements of the wastewater treatment system, and recovering waste heat to the feedwater, thus achieving energy conservation and emission reduction requirements. It addresses the issues of water waste, large wastewater volume, low wastewater treatment temperature requirements, and boiler blowdown wastewater heat recovery. However, this existing technology primarily uses a heat exchanger to cool the boiler wastewater, resulting in high equipment costs for boiler wastewater treatment. Furthermore, the heat exchanger requires frequent cleaning to maintain its heat exchange efficiency, which is not conducive to the continuous operation of the entire recovery method.

[0005] Chinese patent document CN206709048U discloses a waste heat and wastewater recovery system for a waste heat boiler, which includes a waste heat boiler body, a continuous blowdown expander, a water level sensor, a pressure sensor, a heat exchange device, a water storage tank, a collection tank, a heat exchanger, a feed water pump static ring water-cooled jacket, a bearing water-cooled jacket, a circulating water system, and a controller; the blowdown outlet of the waste heat boiler body is connected to the inlet of the continuous blowdown expander via a pipeline; a shut-off valve is installed on the pipeline between the blowdown outlet of the waste heat boiler body and the inlet of the continuous blowdown expander. A safety valve is installed on the spare exhaust pipe of the continuous blowdown expander; a water level sensor is installed on the side wall of the continuous blowdown expander, and a pressure sensor is installed on the side wall of the continuous blowdown expander above the water level sensor; the exhaust port of the continuous blowdown expander is connected to the primary inlet of the heat exchange device through a pipeline, and a pressure regulating valve is installed on the pipeline between the continuous blowdown expander and the heat exchange device; the primary outlet of the heat exchange device is connected to the inlet of the water storage tank through a pipeline; the outlet of the water storage tank is connected to the inlet of the waste heat boiler body through a pipeline, and a pipeline pump is installed on the pipeline between the water storage tank and the waste heat boiler body; the drain port of the continuous blowdown expander is connected to the inlet of the collection tank through a pipeline, and a liquid level regulating valve is installed on the pipeline between the continuous blowdown expander and the collection tank; the outlet of the collection tank is connected to the inlet of the heat exchanger through a pipeline, and a pipeline lift pump is installed on the pipeline between the collection tank and the heat exchanger; the outlet of the heat exchanger is connected to the bearing water cooling jacket. The inlet and the inlet of the feed water pump's stationary ring water-cooled jacket are connected by a pipeline; the outlet of the bearing water-cooled jacket and the outlet of the feed water pump's stationary ring water-cooled jacket are respectively connected to the inlet of the circulating water system by pipelines; the cooling water inlet of the heat exchanger is connected to the outlet of the circulating water system by a pipeline; the cooling water outlet of the heat exchanger is connected to the inlet of the circulating water system by a pipeline; the water level sensor, the air pressure sensor, the pressure regulating valve, the liquid level regulating valve, and the safety valve are respectively electrically connected to the controller. During operation, the steam discharged from the waste heat boiler into the continuous blowdown expander enters the heat exchange device, fully utilizing the heat and avoiding heat energy waste, thus achieving energy saving and consumption reduction; the condensate formed after steam heat exchange flows into the water storage tank, and the condensate in the water storage tank is periodically used as makeup water and circulated back into the waste heat boiler for reuse, ensuring the recovery and utilization of steam and avoiding resource waste; the wastewater in the continuous blowdown expander is used as circulating cooling water to supplement the circulating water system, eliminating the need for discharge, avoiding water resource waste, and reducing investment costs. The existing technology mainly uses heat exchangers to cool boiler wastewater, which makes the cost of boiler wastewater treatment equipment high. Moreover, the heat exchangers need to be cleaned frequently to ensure the heat exchange effect, which is not conducive to the continuous operation of the entire recovery method.

[0006] Chinese patent document CN219283302U discloses a heat recovery device for periodic wastewater discharge from a steam drum boiler. The method of use is as follows: the periodic wastewater discharge from the steam drum boiler enters the interior of a periodic discharge expansion container through a pipeline. Through the combined use of the periodic discharge expansion container and a partition plate, the wastewater is expanded and separated into hot wastewater and secondary steam. The hot wastewater is discharged into a cooling pool through a periodic discharge overflow pipe. The wastewater in the cooling pool is pressurized by a water pump and flows into a plate heat exchanger. A demineralized water inlet valve controls the entry of demineralized water into the plate heat exchanger. The plate heat exchanger converts the wastewater into low-temperature hot wastewater through the demineralized water. The low-temperature hot wastewater flows into the spray pipe assembly below the exhaust port through a spray control valve. Secondary steam enters the exhaust port, and the spray pipe assembly cools the secondary steam into hot water, which then returns to the cooling pool through the periodic discharge overflow pipe. Essentially, no hot steam escapes from the exhaust port. The existing technology achieves the following effect: by periodically discharging wastewater from a steam drum boiler into hot wastewater and secondary steam through a fixed-discharge expansion tank, the hot wastewater is discharged into a cooling pool. A water pump then pumps the hot wastewater from the cooling pool into a plate heat exchanger to heat the demineralized water. The cooled wastewater is then sprayed into the exhaust port through a spray pipe assembly to cool the secondary steam back into hot water, which then returns to the cooling pool through the fixed-discharge overflow pipe. The exhaust port emits virtually no hot steam, thus solving the problem of large amounts of secondary steam being released into the atmosphere from the fixed-discharge expansion tank, resulting in significant calorific value loss. This maximizes the recovery of calorific value from periodically discharged wastewater and improves the boiler's heat recovery efficiency. However, this solution is not suitable for treating boiler wastewater from the chemical industry. Summary of the Invention

[0007] The purpose of this invention is to provide a method and system for treating high-temperature wastewater from boilers, so as to solve the problem that the treatment of high-temperature wastewater from boilers is relatively complex in the prior art.

[0008] To achieve the above objectives, the basic solution of the present invention provides a method for treating high-temperature wastewater from a boiler, including a step of collecting the wastewater, a step of cooling the collected wastewater, and a step of discharging the cooled wastewater. The cooling step includes cooling the wastewater by mixing it with ambient temperature industrial water. The wastewater discharge step includes discharging the cooled wastewater into a desulfurization process water tank and a factory circulating water system.

[0009] This invention utilizes ambient temperature industrial water, which already needs to be added to the desulfurization process water tank and the factory circulating water system, to mix with high-temperature wastewater discharged from the boiler. This cools the boiler wastewater before it is discharged into the desulfurization process water tank and the factory circulating water system. This reduces the direct discharge of boiler wastewater into the environment, saves industrial water consumption, simplifies the treatment process of boiler wastewater, helps reduce the treatment cost of boiler wastewater, and improves economic efficiency.

[0010] Preferably, the step of cooling the collected wastewater further includes using a factory circulating water heat exchanger to cool the wastewater. This arrangement helps to further reduce the temperature of the high-temperature wastewater from the boiler, simplifying its subsequent utilization.

[0011] Preferably, the wastewater is discharged into the factory's circulating water system by discharging the wastewater into the factory's circulating water pipeline.

[0012] Preferably, in the wastewater discharge step, the wastewater is first discharged into the desulfurization process water tank, and when the water volume in the desulfurization process water tank is sufficient, the wastewater is then discharged into the factory's circulating water pipeline.

[0013] Preferably, in the step of collecting wastewater, a water collection tank is used to collect the wastewater; in the step of cooling treatment, ambient temperature industrial water is mixed with wastewater in the water collection tank.

[0014] Preferably, a water pump is connected between the water collection tank and the factory circulating water heat exchanger. A level gauge is installed on the water collection tank, and the level gauge is electrically connected to the controller of the water pump. When the water level in the water collection tank is lower than the preset low water level value of the level gauge, the water pump is turned off.

[0015] Preferably, a regulating valve is connected between the factory circulating water heat exchanger and the desulfurization process water tank, and a switching valve is connected between the factory circulating water heat exchanger and the factory circulating water pipeline. A level gauge is installed on the desulfurization process water tank. When the level gauge detects that the water level in the desulfurization process water tank is higher than the preset high water level, the regulating valve closes and the switching valve opens, so that the wastewater discharged from the factory circulating water heat exchanger mainly flows into the factory circulating water pipeline. When the level gauge detects that the water level in the desulfurization process water tank is lower than the preset low water level, the regulating valve opens and the switching valve closes, so that the wastewater discharged from the factory circulating water heat exchanger mainly flows into the desulfurization process water tank.

[0016] On the other hand, the present invention also provides a treatment system for implementing any of the above-described methods for treating high-temperature boiler wastewater, including a blowdown expansion container, the drain end of which is connected to a water collection tank, the water collection tank being provided with a water injection pipe for injecting industrial water, the outlet end of which is connected to a factory circulating water heat exchanger via a water pump, and the factory circulating water heat exchanger being connected to a desulfurization process water tank via a regulating valve.

[0017] Preferably, the regulating valve is connected to the factory's circulating water system. With this configuration, when the desulfurization process water tank does not require replenishment, the boiler wastewater discharged from the factory's circulating water heat exchanger can be discharged into the factory's circulating water system, thereby allowing the high-temperature boiler wastewater to be continuously treated and meet production requirements.

[0018] The present invention has the following beneficial effects: 1. In the existing technology, the treatment of high-temperature wastewater from boilers is either to directly discharge it after natural cooling, which will cause a large waste of water resources; or to directly cool the high-temperature wastewater with a heat exchanger before treatment. However, the method of directly cooling with a heat exchanger will result in the cooling efficiency not meeting the wastewater treatment requirements, and the heat exchanger needs to be shut down for cleaning after a period of use, which seriously affects the wastewater treatment efficiency.

[0019] Compared with existing technologies, the advantages of this invention are as follows: Using the solution of this invention, the high-temperature wastewater from the boiler is cooled by mixing it with ambient temperature industrial water, and then further cooled by a heat exchanger in the factory circulating water system before being discharged into the desulfurization process water tank and / or the factory circulating water system. This avoids the waste of water resources and the environmental impact of high temperatures caused by direct discharge of high-temperature wastewater, thereby achieving the goal of emission reduction. Simultaneously, the high-temperature wastewater from the boiler replenishes the desulfurization process water or factory circulating water, enabling wastewater recycling. This reduces the consumption of industrial water by the desulfurization process water and factory circulating water, and also reduces the discharge and treatment costs of the high-temperature wastewater from the boiler, generating significant economic value. Furthermore, the entire process of treating the high-temperature wastewater from the boiler is simplified. By mixing the wastewater with ambient temperature industrial water and then cooling it through a heat exchanger, compared with the direct use of heat exchangers for cooling in existing technologies, the efficiency of wastewater cooling treatment is significantly improved. This not only meets the requirements for the treatment efficiency of high-temperature wastewater from the boiler but also reduces the likelihood of heat exchanger blockage, thus reducing maintenance costs. Taking a 460T / H boiler as an example, it can save about 370,000 yuan per year.

[0020] 2. This invention makes full use of the factory's existing equipment, which helps to reduce equipment investment and thus lower costs.

[0021] 3. At least part of the processing in this invention is automatically controlled, which makes the operation simple and convenient.

[0022] 4. The entire processing of this invention achieves closed-loop operation, reducing the impact on the environment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of a treatment system for implementing a method for treating high-temperature boiler wastewater according to the present invention. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method: In this invention, high-temperature boiler wastewater refers to boiler wastewater with a temperature of around 200 degrees Celsius.

[0025] The reference numerals in the accompanying drawings include: 1. Sewage expansion container; 2. Water injection pipe; 3. Water collection tank; 5. Water pump; 6. Flow meter; 7. Plant circulating water heat exchanger; 8. Regulating valve; 10. Desulfurization process water tank; 11. Plant circulating water pipeline.

[0026] Example 1: As Figure 1 As shown, a boiler high-temperature wastewater treatment system includes a blowdown expansion container 1, with a water collection tank 3 connected to the drain end of the blowdown expansion container 1 for collecting wastewater. The water collection tank 3 is equipped with a water injection pipe 2 for injecting industrial water, and the water outlet of the water collection tank 3 is connected to a factory circulating water heat exchanger 7 via a water pump 5. The factory circulating water heat exchanger 7 is connected to a desulfurization process water tank 10. In this embodiment, a level gauge 4 is installed on the water collection tank 3 for monitoring the water level inside the water collection tank 3.

[0027] In this embodiment, at least one water pump 5 is provided, preferably two, connected in parallel, forming a setup where one pump is in use and the other is on standby, which improves the reliability of wastewater transportation. The switch controller of the water pump 5 is electrically connected to the level gauge 4 on the water collection tank 3. When the water level in the water collection tank 3 is lower than the preset low water level value of the level gauge 4, the water pump 5 shuts off. A flow meter 6 is installed on the pump outlet pipe of the water pump 5 for convenient flow monitoring.

[0028] In this embodiment, the factory circulating water heat exchanger 7 is provided with a circulating heat exchange chamber connected to the factory circulating water pipeline 11. The factory circulating water heat exchanger 7 also includes a wastewater heat exchange chamber connected to the pump outlet pipeline of the water pump 5. The wastewater heat exchange chamber and the circulating heat exchange chamber exchange heat. In this embodiment, the factory circulating water heat exchanger 7 is preferably a plate heat exchanger. A regulating valve 8 connects the wastewater heat exchange chamber of the factory circulating water heat exchanger 7 to the desulfurization process water tank 10, and an on / off valve connects the wastewater heat exchange chamber of the factory circulating water heat exchanger 7 to the factory circulating water pipeline 11.

[0029] A level gauge 9 is installed on the desulfurization process water tank 10. The level gauge 9 is electrically connected to the controllers of the regulating valve 8 and the switching valve. When the level gauge 9 detects that the water level in the desulfurization process water tank 10 is higher than the preset high water level, the regulating valve 8 closes and the switching valve opens, so that the wastewater discharged from the factory circulating water heat exchanger 7 mainly flows into the factory circulating water pipeline 11. When the level gauge 9 detects that the water level in the desulfurization process water tank 10 is lower than the preset low water level, the regulating valve 8 opens and the switching valve closes, so that the wastewater discharged from the factory circulating water heat exchanger 7 mainly flows into the desulfurization process water tank 10. This achieves automatic adjustment of the wastewater discharge path according to the water level in the desulfurization process water tank 10, allowing the treatment of high-temperature wastewater to continue.

[0030] Example 2: Figure 1As shown, a boiler high-temperature wastewater treatment system includes a blowdown expansion container 1, with a water collection tank 3 connected to the drain end of the blowdown expansion container 1 for collecting wastewater. The water collection tank 3 is equipped with a water injection pipe 2 for injecting industrial water, and the water outlet of the water collection tank 3 is connected to a factory circulating water heat exchanger 7 via a water pump 5. The factory circulating water heat exchanger 7 is connected to a desulfurization process water tank 10. In this embodiment, a level gauge 4 is installed on the water collection tank 3 for monitoring the water level inside the water collection tank 3.

[0031] In this embodiment, at least one water pump 5 is provided, preferably two, connected in parallel, forming a setup where one pump is in use and the other is on standby, which improves the reliability of wastewater transportation. The switch controller of the water pump 5 is electrically connected to the level gauge 4 on the water collection tank 3. When the water level in the water collection tank 3 is lower than the preset low water level value of the level gauge 4, the water pump 5 shuts off. A flow meter 6 is installed on the pump outlet pipe of the water pump 5 for convenient flow monitoring.

[0032] In this embodiment, the factory circulating water heat exchanger 7 is provided with a circulating heat exchange chamber connected to the factory circulating water pipeline 11. The factory circulating water heat exchanger 7 also includes a wastewater heat exchange chamber connected to the pump outlet pipeline of the water pump 5. The wastewater heat exchange chamber and the circulating heat exchange chamber exchange heat. In this embodiment, the factory circulating water heat exchanger 7 is preferably a plate heat exchanger. A regulating valve 8 connects the wastewater heat exchange chamber of the factory circulating water heat exchanger 7 to the desulfurization process water tank 10 and the factory circulating water pipeline 11. In this embodiment, the regulating valve 8 is a diverting three-way valve that can change the direction of medium flow. By adjusting the regulating valve, it is possible to control whether the wastewater discharged from the wastewater heat exchange chamber of the factory circulating water heat exchanger 7 flows to the desulfurization process water tank 10 or to the factory circulating water pipeline 11.

[0033] A level gauge 9 is installed on the desulfurization process water tank 10. The level gauge 9 is electrically connected to the controller of the regulating valve 8 and the on / off valve. When the level gauge 9 detects that the water level in the desulfurization process water tank 10 is higher than the preset high water level, it controls the regulating valve 8 to close the channel flowing to the desulfurization process water tank 10 and simultaneously open the channel flowing to the factory circulating water pipeline 11, so that the wastewater discharged from the factory circulating water heat exchanger 7 mainly flows into the factory circulating water pipeline 11. When the level gauge 9 detects that the water level in the desulfurization process water tank 10 is lower than the preset low water level, it controls the regulating valve 8 to open the channel flowing to the desulfurization process water tank 10 and simultaneously close the channel flowing to the factory circulating water pipeline 11, so that the wastewater discharged from the factory circulating water heat exchanger 7 mainly flows into the desulfurization process water tank 10. This achieves automatic adjustment of the wastewater discharge path according to the water level in the desulfurization process water tank 10, allowing the treatment of high-temperature wastewater to continue.

[0034] Example 3: A method for treating high-temperature wastewater from a boiler, wherein the treatment system described in Example 1 is used to implement the specific treatment method.

[0035] The specific steps of the treatment method include the collection of wastewater. In this embodiment, a collection tank 3 is used to collect the wastewater. Specifically, high-temperature wastewater with a certain pressure flows naturally into the collection tank 3 after being depressurized by the sewage expansion container 1.

[0036] The specific steps of the treatment method also include a step of cooling the collected wastewater. In this embodiment, the cooling step involves mixing ambient temperature industrial water with the wastewater to lower the wastewater temperature. Specifically, industrial water is injected into the wastewater collection tank 3 through the water injection pipe 2 to mix the industrial water with the wastewater, thereby cooling the wastewater in the collection tank 3. The cooling step also includes further cooling the wastewater discharged from the collection tank 3 using the factory circulating water heat exchanger 7. Specifically, the collection tank 3 is connected to the factory circulating water heat exchanger 7 using a water pump 5, so that the wastewater in the collection tank 3 is pumped to the factory circulating water heat exchanger 7 for further cooling.

[0037] The specific steps of the treatment method also include the discharge of cooled wastewater. The cooled wastewater discharged from the factory circulating water heat exchanger 7 is first discharged into the desulfurization process water tank 10, thereby utilizing boiler wastewater to supplement the desulfurization process water and achieving wastewater reuse. When the desulfurization process water tank 10 has sufficient water, the wastewater is then discharged into the factory circulating water pipeline 11 of the factory circulating water system, allowing boiler wastewater to supplement the factory circulating water. When the desulfurization process water tank 10 is insufficient, boiler wastewater preferentially replenishes the desulfurization process water tank 10 again.

[0038] In this invention, both the desulfurization process water tank and the factory circulating water system are existing equipment in the factory where the boiler is located. The construction of the treatment system only requires improvements to the existing collection tank and the installation of water pumps and pipelines to connect to the factory circulating water heat exchanger 7. Pipelines connect the factory circulating water heat exchanger to the desulfurization process water tank and the factory circulating water pipelines, allowing the treatment system to fully utilize the existing equipment in the factory where the boiler is located, thereby significantly reducing the construction cost of the treatment system. The use of ambient temperature industrial water injected into the collection tank 3 rapidly reduces the temperature and concentration of the boiler's high-temperature wastewater, creating favorable conditions for the reuse of the boiler's high-temperature wastewater. This invention utilizes the fact that the desulfurization process water tank and the factory circulating water system themselves require replenishment of industrial water. Before replenishing the desulfurization process water tank and the factory circulating water system, the industrial water is mixed with the high-temperature wastewater from the boiler. Taking advantage of the fact that the temperature of the industrial water is lower than that of the high-temperature wastewater from the boiler, the high-temperature wastewater from the boiler is cooled down quickly. At the same time, the cooled high-temperature wastewater from the boiler is used as a replenishment water source for the desulfurization process water tank and the factory circulating water system. This not only realizes the reuse of the high-temperature wastewater from the boiler, but also reduces the consumption of industrial water.

[0039] Compared with existing technologies, this solution involves mixing and cooling boiler high-temperature wastewater with ambient temperature industrial water, followed by further cooling through a factory circulating water heat exchanger before being discharged into the desulfurization process water tank or factory circulating water pipeline. This avoids the waste of water resources and the environmental impact of high temperatures caused by direct discharge of high-temperature wastewater, thereby achieving the goal of emission reduction. At the same time, it also allows the boiler high-temperature wastewater to supplement the desulfurization process water or factory circulating water, giving the wastewater greater economic value and simplifying the entire process of treating boiler high-temperature wastewater.

[0040] Taking a 460T / H boiler operating for 8000 hours per year as an example, the annual wastewater discharge reaches 73,600 tons. At a wastewater treatment price of 3.92 yuan / ton, the cost of treating the wastewater is 288,500 yuan. After adopting this invention, the factory can reduce its consumption of ambient temperature industrial water by 73,600 tons. Assuming an industrial water price of 1.17 yuan / ton, this will save 86,100 yuan in industrial water costs. Simultaneously, it can save 288,500 yuan in treatment costs previously required for direct discharge of high-temperature wastewater from the boiler. The total savings amount to 374,600 yuan, meaning that a single 460T / H boiler can save 374,600 yuan annually, demonstrating significant economic benefits. Moreover, factories typically have more than one boiler, making the economic benefits of adopting this invention even more pronounced.

[0041] This invention makes full use of existing factory equipment, which helps reduce equipment investment and thus lower costs. At least part of the processing is automated, making operation simple and convenient. The entire processing is conducted in a closed loop, reducing environmental impact.

[0042] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for treating high-temperature wastewater from a boiler, comprising the steps of collecting the wastewater, cooling the collected wastewater, and discharging the cooled wastewater, characterized in that: The cooling process includes mixing ambient temperature industrial water with the wastewater to cool it down; the wastewater discharge process includes discharging the cooled wastewater into the desulfurization process water tank and the factory circulating water system.

2. The method for treating high-temperature boiler wastewater according to claim 1, characterized in that: The step of cooling the collected wastewater also includes using a factory circulating water heat exchanger to cool the wastewater.

3. The method for treating high-temperature boiler wastewater according to claim 2, characterized in that: The wastewater is discharged into the factory's circulating water system by discharging it into the factory's circulating water pipeline.

4. The method for treating high-temperature boiler wastewater according to claim 3, characterized in that: In the wastewater discharge process, the wastewater is first discharged into the desulfurization process water tank, and when the water volume in the desulfurization process water tank is sufficient, the wastewater is then discharged into the factory's circulating water pipeline.

5. The method for treating high-temperature boiler wastewater according to claim 4, characterized in that: In the step of collecting wastewater, a collection tank is used to collect the wastewater; in the step of cooling treatment, ambient temperature industrial water is mixed with wastewater in the collection tank.

6. The method for treating high-temperature boiler wastewater according to claim 5, characterized in that: A water pump is connected between the water collection tank and the factory circulating water heat exchanger. A level gauge is installed on the water collection tank and is electrically connected to the water pump controller. When the water level in the water collection tank is lower than the preset low water level value of the level gauge, the water pump is turned off.

7. The method for treating high-temperature boiler wastewater according to claim 6, characterized in that: A regulating valve connects the factory circulating water heat exchanger to the desulfurization process water tank, and a switching valve connects the factory circulating water heat exchanger to the factory circulating water pipeline. A level gauge is installed on the desulfurization process water tank. When the level gauge detects that the water level in the desulfurization process water tank is higher than the preset high water level, the regulating valve closes and the switching valve opens, so that the wastewater discharged from the factory circulating water heat exchanger mainly flows into the factory circulating water pipeline. When the level gauge detects that the water level in the desulfurization process water tank is lower than the preset low water level, the regulating valve opens and the switching valve closes, so that the wastewater discharged from the factory circulating water heat exchanger mainly flows into the desulfurization process water tank.

8. A treatment system for treating boiler high-temperature wastewater according to any one of claims 1 to 7, comprising a blowdown expansion tank, characterized in that: The drainage end of the sewage expansion container is connected to a water collection tank, which is equipped with a water injection pipe for injecting industrial water. The outlet end of the water collection tank is connected to a factory circulating water heat exchanger via a water pump, and the factory circulating water heat exchanger is connected to a desulfurization process water tank via a regulating valve.

9. The processing system according to claim 8, characterized in that: The factory circulating water heat exchanger is a plate heat exchanger.

10. The processing system according to claim 9, characterized in that: The regulating valve is connected to the factory's circulating water system.

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