Boiler sewage treatment system

Abstract

The utility model relates to the field of boiler sewage treatment, in particular to a boiler sewage treatment system, which comprises a sewage circulating device, a sewage discharge pool and a heat exchange device, the sewage circulating device comprises a periodic discharge flash tank, a circulating liquid inlet pipe and a circulating liquid discharge pipe, and the circulating liquid inlet pipe and the circulating liquid discharge pipe are respectively communicated with the periodic discharge flash tank. The circulating liquid inlet pipe is provided with a sewage circulating pump; the periodic blowdown flash tank is communicated with a blowdown valve of the boiler; the circulating liquid discharge pipe is communicated with the sewage discharge tank; the heat exchange device is provided with a heat exchange cavity and a heat exchange pipeline, the heat exchange cavity is communicated with the blowdown pool, and the circulating liquid inlet pipe is communicated with the blowdown pool or the heat exchange cavity; the heat exchange pipeline can take away heat of the heat exchange cavity; the heat exchange device can extract sewage in the sewage pool for cooling, and the sewage circulating device injects the cooled sewage into the periodic drainage flash tank, so that thermal pollution is reduced; the heat exchange device is adopted to cool sewage in a heat exchange manner, and cooling water is prevented from entering, so that the sewage treatment capacity of the dephosphorization device is reduced, and the service life of the dephosphorization device is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of boiler sewage treatment, in particular to a boiler sewage treatment system. Background Art

[0002] like Figure 1 As shown, in the boiler sewage system, the fixed discharge expansion tank 1 is provided with a discharge pipe connected to the atmosphere. In order to reduce thermal pollution, the production water is currently injected into the fixed discharge expansion tank 1 through the production water injection pipeline 100, so that the production water cools the sewage. The production water is mixed with the boiler sewage in the fixed discharge expansion tank 1, and then enters the dephosphorization device 101 for dephosphorization. The addition of production water increases the sewage treatment capacity of the dephosphorization device 101; since the dephosphorization device 101 dephosphorizes the sewage through a reverse osmosis membrane, the reverse osmosis membrane needs to be replaced after reaching a certain treatment capacity, and the addition of production water reduces the sewage treatment efficiency of the reverse osmosis membrane; although the use of production water to cool the boiler sewage can achieve the effect of reducing thermal pollution, it increases the sewage treatment capacity and increases the maintenance cost of the dephosphorization device 101. Utility Model Content

[0003] The utility model aims to overcome the disadvantages of the prior art that the treatment method of cooling sewage by mixing production water with boiler sewage will increase the sewage treatment capacity of the dephosphorization device, and provide a boiler sewage treatment system.

[0004] In a first aspect, the utility model provides a boiler wastewater treatment system, comprising:

[0005] A sewage circulation device, the sewage circulation device comprises a fixed-discharge expansion tank, a circulating liquid inlet pipe and a circulating liquid discharge pipe, the circulating liquid inlet pipe and the circulating liquid discharge pipe are respectively connected to the fixed-discharge expansion tank, the circulating liquid inlet pipe is provided with a sewage circulation pump; the fixed-discharge expansion tank is connected to the blowdown valve of the boiler;

[0006] A sewage tank, wherein the circulating drainage pipe is in communication with the sewage tank;

[0007] A heat exchange device, wherein the heat exchange device is provided with a heat exchange chamber and a heat exchange pipeline, the heat exchange chamber is connected to the sewage tank, the circulating liquid inlet pipe is connected to the sewage tank or the heat exchange chamber; the heat exchange pipeline can take away the heat of the heat exchange chamber.

[0008] The utility model discloses a boiler sewage treatment system, in which sewage drawn into a heat exchange chamber by a heat exchange device is subjected to heat exchange between the heat exchange chamber and a heat exchange pipeline so as to cool the sewage; the cooled sewage is drawn by a sewage circulation pump, and is injected into a fixed-discharge expansion vessel through a circulation liquid inlet pipe, in which the cooled sewage is mixed with high-temperature sewage to reduce the temperature of the sewage, thereby reducing thermal pollution to the environment; the heat exchange pipeline of the heat exchange device cools the sewage by heat exchange, thereby avoiding an increase in the sewage treatment volume of the dephosphorization device; the heat exchange pump can make the cooling water in the heat exchange pipeline flow, so that the sewage in the heat exchange device can be quickly cooled; the utility model discloses a boiler sewage treatment system, in which sewage is cooled by a heat exchange device, and the cooled sewage is used to cool the sewage in the fixed-discharge expansion vessel, thereby reducing the sewage treatment volume of the dephosphorization device and improving the sewage treatment efficiency of the dephosphorization device.

[0009] The fixed-discharge expansion tank can collect boiler water with sediment and impurities at the bottom of the boiler and discharge the waste water through regular sewage discharge.

[0010] Preferably, it also includes a high-salt sewage treatment device, which is connected to the sewage valve of the boiler and is connected to the fixed-discharge expansion tank.

[0011] The high-salt sewage in the sewage is treated by a high-salt sewage treatment device, and the treated sewage is discharged into a fixed-discharge expansion vessel, in which the high-temperature sewage and the cooled sewage are mixed to cool the sewage.

[0012] Preferably, the high-salt sewage treatment device includes a continuous row expansion tank and a deaerator, the continuous row expansion tank is provided with a continuous row liquid inlet, a continuous row liquid discharge port and a deoxygenation water supply port, the continuous row liquid inlet is connected to the boiler's sewage valve, the continuous row liquid discharge port is connected to the fixed row expansion tank, and the deoxygenation water supply port is connected to the deaerator.

[0013] The continuous expansion tank collects boiler water with high salt content on the water surface of the boiler drum. The boiler discharges the sewage into the continuous expansion tank by continuous sewage discharge. The deaerator removes oxygen from the salt water, and the generated deoxygenated water is supplied to the boiler and other equipment to prevent oxygen corrosion of the boiler and pipelines.

[0014] Preferably, the heat exchange device is provided with a cooling cavity, the cooling cavity is spaced apart from the heat exchange cavity, the cooling cavity is connected to the heat exchange pipeline, the heat exchange pipeline is provided with a heat exchange pump, and the heat exchange pump is used to provide cooling liquid.

[0015] The heat exchange area is increased by providing a cooling chamber, and the water in the heat exchange pipeline exchanges heat with the sewage in the heat exchange chamber when flowing through the cooling chamber, thereby accelerating the cooling speed of the sewage in the heat exchange chamber.

[0016] Preferably, the heat exchange pipeline includes a water supply pipeline and a water return pipeline, the heat exchange pump is arranged in the water supply pipeline, and the water supply pipeline and the water return pipeline are respectively connected to the cooling chamber.

[0017] The heat exchange pump continuously injects cooling water into the cooling chamber through the water supply pipe, and the return pipe continuously discharges cooling water from the cooling chamber, so that the cooling water in the cooling chamber flows in one direction, and the cooling water after heat exchange is discharged from the cooling chamber through the return pipe, so that the cooling water in the cooling chamber can continuously exchange heat with the sewage in the heat exchange chamber.

[0018] Preferably, it further comprises a control device, which is control-connected to the heat exchange pump and / or the sewage circulation pump.

[0019] The control device can control the operating efficiency of the heat exchange pump or the sewage circulation pump, control the sewage flow rate in the circulating liquid inlet pipe or the cooling water flow rate in the heat exchange pipeline, thereby controlling the heat exchange efficiency of the heat exchange device and adjusting the temperature of the cooled sewage.

[0020] Preferably, the heat exchange chamber is provided with a temperature sensor, and the temperature sensor is communicatively connected to the control device.

[0021] By setting a temperature sensor, the temperature sensor can detect the sewage temperature in the heat exchange chamber in real time, so that the temperature of the treated sewage is less than 32 degrees Celsius; through the temperature sensor and the control device communication connection, the communication device can control the heat exchange pump or the sewage circulation pump according to the temperature data, so that the temperature of the sewage after heat exchange is maintained at about 32 degrees Celsius; the control device is a device with the function of controlling the operating efficiency of the motor.

[0022] Preferably, the fixed-row expander is provided with an exhaust port, and the exhaust port is connected to an exhaust duct.

[0023] The steam generated in the fixed discharge expansion vessel can be discharged to the atmosphere through the exhaust pipe.

[0024] Preferably, the heat exchange pipeline is provided with a loop drain pipe, a drain valve is provided on the loop drain pipe, and the loop drain pipe can be connected to the sewage tank.

[0025] The cooling water in the heat exchange pipeline can be discharged into the sewage tank through the loop drain pipe. When the amount of sewage in the sewage tank is too little, the sewage circulation device can operate normally by discharging cooling water into the sewage tank.

[0026] Preferably, the sewage pool is provided with a sewage pipeline, the sewage pipeline is connected to the phosphorus removal device, and the sewage pipeline is provided with at least one sewage pump.

[0027] The sewage in the sewage pool is discharged into the dephosphorization device for treatment through the sewage pump and sewage pipeline. The sewage pump can extract the sewage in the sewage pool.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] 1. The utility model discloses a boiler sewage treatment system, wherein the sewage drawn into the heat exchange chamber by the heat exchange device is heat exchanged with the heat exchange pipeline through the heat exchange chamber to cool the sewage; the cooled sewage is drawn by the sewage circulation pump, and is injected into the fixed-discharge expansion vessel through the circulation liquid inlet pipe, where the cooled sewage is mixed with the high-temperature sewage to reduce the temperature of the sewage, thereby reducing the thermal pollution to the environment; the heat exchange pipeline of the heat exchange device cools the sewage by heat exchange, thereby avoiding an increase in the sewage treatment capacity of the dephosphorization device; the heat exchange pump can make the cooling water in the heat exchange pipeline flow, so that the sewage in the heat exchange device can be quickly cooled; the utility model discloses a boiler sewage treatment system, wherein the sewage is cooled by the heat exchange device, and the cooled sewage is used to cool the sewage in the fixed-discharge expansion vessel, thereby reducing the sewage treatment capacity of the dephosphorization device and improving the sewage treatment efficiency of the dephosphorization device;

[0030] 2. The utility model provides a boiler sewage treatment system with a simple structure and convenient use. The sewage in the sewage pool can be cooled by a heat exchange device, and the cooled sewage can be injected into the fixed-discharge expansion tank in conjunction with a sewage circulation device, thereby realizing the cooling of the sewage in the fixed-discharge expansion tank and reducing thermal pollution. The heat exchange device is used to cool the sewage in a heat exchange manner to avoid injecting cooling water into the fixed-discharge expansion tank, thereby reducing the sewage treatment volume of the dephosphorization device and increasing the service life of the dephosphorization device, and has good economic value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a boiler sewage system in the prior art;

[0032] Figure 2 is a schematic structural diagram of a boiler wastewater treatment system in Example 1;

[0033] Figure 3 is a schematic diagram of a boiler wastewater treatment system in one or more embodiments;

[0034] Figure 4 is a schematic diagram of a boiler wastewater treatment system in one or more embodiments;

[0035] Figure 5 is a schematic diagram of the structure of a heat exchange pipeline in one or more embodiments;

[0036] Figure 6 is a schematic diagram of the structure of a heat exchange device in one or more embodiments;

[0037] Figure 7is a schematic cross-sectional view of a heat exchange device in one or more embodiments;

[0038] Figure 8 It is a structural schematic diagram of a boiler wastewater treatment system in Example 2.

[0039] Markings in the figure:

[0040] 1-fixed row expansion vessel, 2-circulating liquid inlet pipe, 3-circulating liquid discharge pipe, 4-sewage circulation pump, 5-drainage tank, 6-heat exchange device, 7-heat exchange pump, 8-heat exchange pipeline, 9-continuous row expansion vessel, 10-deaerator, 11-exhaust pipe, 12-drain valve, 13-drainage pipeline, 14-drainage pump, 15-control device, 16-temperature sensor, 61-sewage suction pipe, 62-cooling chamber, 63-heat exchange chamber, 64-heat exchanger outlet pipe, 81-water supply pipeline, 82-return water pipeline, 83-cooling water source, 84-recovery tank, 100-production water injection pipeline, 101-dephosphorization device, 102-boiler. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0042] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the expression terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present utility model.

[0043] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding devices / components / elements are within the error / deviation range, they can still achieve their functions in the solution of the utility model.

[0044] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0045] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0046] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0047] Example 1

[0048] like Figure 2-Figure 7 As shown, a boiler wastewater treatment system includes a wastewater circulation device, a sewage tank 5 and a heat exchange device 6.

[0049] The sewage circulation device includes a fixed-discharge expansion tank 1, a circulating liquid inlet pipe 2 and a circulating liquid discharge pipe 3, the circulating liquid inlet pipe 2 and the circulating liquid discharge pipe 3 are respectively connected to the fixed-discharge expansion tank 1, and the circulating liquid inlet pipe 2 is provided with a sewage circulation pump 4; the fixed-discharge expansion tank 1 is connected to the sewage valve of the boiler 102; the circulating liquid discharge pipe 3 is connected to the sewage tank 5; the heat exchange device 6 is provided with a heat exchange chamber 63 and a heat exchange pipeline 8, the heat exchange chamber 63 is connected to the sewage tank 5, the circulating liquid inlet pipe 2 is connected to the sewage tank 5 or the heat exchange chamber 63; the heat exchange pipeline 8 can take away the heat of the heat exchange chamber 63.

[0050] In one or several embodiments, a high-salt sewage treatment device is also included, which is connected to the sewage valve of the boiler 102, and the high-salt sewage treatment device is connected to the fixed-discharge expansion tank 1; the high-salt sewage of the boiler 102 is treated by the high-salt sewage treatment device, and the treated sewage is discharged into the fixed-discharge expansion tank 1 for cooling.

[0051] In an optional embodiment, the high-salt sewage treatment device is composed of a continuous expansion tank 9 and a deaerator 10. The continuous expansion tank 9 is provided with a continuous liquid inlet, a continuous liquid discharge port and a deoxygenation water supply port. The continuous liquid inlet is connected to the continuous sewage valve of the boiler 102, and the continuous liquid discharge port is connected to the fixed-discharge expansion tank 1, so that the treated sewage in the continuous expansion tank 9 is discharged into the fixed-discharge expansion tank 1 for cooling treatment; the deaerator 10 is connected to the deoxygenation water supply port. The deaerator 10 can remove oxygen from the high-salt sewage to form deoxygenated water for use in equipment such as the boiler 102, thereby preventing oxygen corrosion of the boiler 102 and the pipeline.

[0052] In one or several embodiments, the heat exchange device 6 is provided with a cooling chamber 62, which is spaced apart from the heat exchange chamber 63 and is connected to the heat exchange pipeline 8; the projection of the heat exchange chamber 63 is located in the cooling chamber 62, that is, the cooling chamber 62 has a sufficiently large heat transfer area, so that the sewage in the heat exchange chamber 63 can be quickly cooled; and a sewage suction pipe 61 connected to the heat exchange chamber 63 is provided on the heat exchange device 6.

[0053] In an optional embodiment, the heat exchange pipeline 8 is composed of a water supply pipeline 81 and a water return pipeline 82. One end of the cooling chamber 62 is connected to the water supply pipeline 81, and the other end is connected to the water return pipeline 82. A heat exchange pump 7 is arranged on the water supply pipeline 81. Through the operation of the heat exchange pump 7, the cooling water flows unidirectionally in the heat exchange pipeline 8, so that the cooling water can take away heat when discharged from the cooling chamber 62, so that the heat exchange pipeline 8 can continuously perform heat exchange on the sewage in the heat exchange chamber 63; the water supply pipeline 81 is connected to the cooling water source 83, and the return pipeline 82 is connected to the recovery tank 84.

[0054] In one or several embodiments, a control device 15 is also included, which is controlled and connected to the heat exchange pump 7 and the sewage circulation pump 4; the control device 15 can adjust the sewage flow rate in the heat exchange chamber 63 and the cooling water flow rate in the cooling chamber 62, thereby controlling the heat exchange efficiency and adjusting the temperature of the cooled sewage.

[0055] In an optional implementation, the control device 15 is only connected to the heat exchange pump 7 .

[0056] In an optional implementation, the control device 15 is only connected to the sewage circulation pump 4 .

[0057] In an optional embodiment, a temperature sensor 16 is provided in the heat exchange chamber 63, and the temperature sensor 16 is communicatively connected to the control device 15; the temperature sensor 16 can detect the sewage temperature in the heat exchange chamber 63 in real time, so that the temperature of the treated sewage is less than 32 degrees Celsius; the temperature sensor 16 is communicatively connected to the control device 15, so that the communication device can control the heat exchange pump 7 or the sewage circulation pump 4 according to the temperature data, so that the temperature of the sewage after heat exchange is maintained at about 32 degrees Celsius.

[0058] In one or several embodiments, the fixed-displacement expander 1 is provided with an exhaust port, which is connected to an exhaust pipe 11 , and steam is discharged into the atmosphere through the exhaust pipe 11 .

[0059] In one or several embodiments, a loop drain pipe is provided in the heat exchange pipeline 8, a drain valve 12 is provided on the loop drain pipe, and the loop drain pipe can be connected with the sewage tank 5; the cooling water in the heat exchange pipeline 8 can be discharged into the sewage tank 5 through the loop drain pipe. When the amount of sewage in the sewage tank 5 is too little, the cooling water can be discharged into the sewage tank so that the sewage circulation device can operate normally.

[0060] In one or several embodiments, a sewage pool 5 is provided with a sewage pipe 13, the sewage pipe 13 is connected to the dephosphorization device 101, and a sewage pump 14 is provided in the sewage pipe 13. The sewage in the sewage pool is discharged into the dephosphorization device 101 for treatment through the sewage pump 14 and the sewage pipe 13. The sewage pump 14 can extract the sewage in the sewage pool.

[0061] In an optional embodiment, three sewage pumps 14 are provided.

[0062] A boiler wastewater treatment system, by adding a wastewater circulation pump 4 and a heat exchange device 6, changes the cooling medium of the wastewater, reduces the wastewater volume of the boiler 102 wastewater system, and reduces the wastewater treatment load and maintenance cost of the dephosphorization device 101.

[0063] Example 2

[0064] like Figure 8A boiler sewage treatment system is shown, and its structure is substantially the same as that of the embodiment 1. The difference from the embodiment 1 is that a heat exchanger outlet pipe 64 is further provided on the heat exchange device 6, one end of the heat exchanger outlet pipe 64 is connected to the heat exchange chamber 63, and the other end is connected to the sewage tank 5, and a pump is provided on the sewage suction pipe 61, so that the heat exchange device 6 cools the sewage in the sewage tank 5;

[0065] The circulating liquid inlet pipe 2 is connected to the sewage tank 5, so that the heat exchange device 6 is connected to the circulating liquid inlet pipe 2 through the sewage tank 5; so that the sewage circulation pump 4 can pump the cooled sewage in the sewage tank 5 into the fixed discharge expansion container 1

[0066] The specific heat exchange pipeline 8 is not provided with a drain valve 12 .

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler wastewater treatment system, characterized in that: include A sewage circulation device, the sewage circulation device comprising a fixed-discharge expansion tank (1), a circulation liquid inlet pipe (2) and a circulation liquid discharge pipe (3), the circulation liquid inlet pipe (2) and the circulation liquid discharge pipe (3) being respectively connected to the fixed-discharge expansion tank (1), the circulation liquid inlet pipe (2) being provided with a sewage circulation pump (4); the fixed-discharge expansion tank (1) being connected to a sewage discharge valve of a boiler (102); A sewage tank (5), wherein the circulating drainage pipe (3) is connected to the sewage tank (5); A heat exchange device (6), wherein the heat exchange device (6) is provided with a heat exchange chamber (63) and a heat exchange pipeline (8), the heat exchange chamber (63) is connected to the sewage tank (5), and the circulating liquid inlet pipe (2) is connected to the sewage tank (5) or the heat exchange chamber (63); the heat exchange pipeline (8) is capable of taking away heat from the heat exchange chamber (63).

2. A boiler wastewater treatment system according to claim 1, characterized in that: It also includes a high-salt sewage treatment device, which is connected to the sewage discharge valve of the boiler (102), and the high-salt sewage treatment device is connected to the fixed-discharge expansion tank (1).

3. A boiler wastewater treatment system according to claim 2, characterized in that: The high-salinity sewage treatment device comprises a continuous row expansion tank (9) and a deaerator (10), wherein the continuous row expansion tank (9) is provided with a continuous row liquid inlet, a continuous row liquid outlet and a deaerator water supply port, wherein the continuous row liquid inlet is connected to a sewage valve of a boiler (102), the continuous row liquid outlet is connected to the fixed row expansion tank (1), and the deaerator water supply port is connected to the deaerator (10).

4. A boiler wastewater treatment system according to claim 1, characterized in that: The heat exchange device (6) is provided with a cooling chamber (62), the cooling chamber (62) and the heat exchange chamber (63) are arranged at intervals, the cooling chamber (62) is connected to the heat exchange pipeline (8), the heat exchange pipeline (8) is provided with a heat exchange pump (7), and the heat exchange pump (7) is used to provide cooling liquid.

5. A boiler wastewater treatment system according to claim 4, characterized in that: The heat exchange pipeline (8) comprises a water supply pipeline (81) and a water return pipeline (82); the heat exchange pump (7) is arranged on the water supply pipeline (81); and the water supply pipeline (81) and the water return pipeline (82) are respectively connected to the cooling chamber (62).

6. A boiler wastewater treatment system according to claim 4, characterized in that: It also comprises a control device (15), wherein the control device (15) is controllably connected to the heat exchange pump (7) and / or the sewage circulation pump (4).

7. A boiler wastewater treatment system according to claim 6, characterized in that: The heat exchange cavity (63) is provided with a temperature sensor (16), and the temperature sensor (16) is communicatively connected to the control device (15).

8. A boiler wastewater treatment system according to claim 1, characterized in that: The fixed-row expansion container (1) is provided with an exhaust port, and the exhaust port is connected to an exhaust pipe (11).

9. A boiler wastewater treatment system according to claim 1, characterized in that: The heat exchange pipeline (8) is provided with a loop drain pipe, on which a drain valve (12) is provided, and the loop drain pipe can be in communication with the sewage tank (5).

10. A boiler wastewater treatment system according to any one of claims 1 to 9, characterized in that: The sewage pool (5) is provided with a sewage pipeline (13), the sewage pipeline (13) is connected to the dephosphorization device (101), and the sewage pipeline (13) is provided with at least one sewage pump (14).

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