Boiler continuously-discharged sewage waste heat recycling device

Abstract

The utility model discloses a boiler continuously-discharged sewage waste heat recycling device which is characterized by comprising a first-stage drainage pressure and temperature reduction system, a second-stage drainage pressure and temperature reduction system and a storage bin heating assembly. The first-stage drainage pressure-reducing and temperature-reducing system is used for receiving continuously-discharged sewage generated by a boiler and performing pressure-reducing and temperature-reducing on the continuously-discharged sewage to a first-stage set temperature and a first-stage set pressure, and the continuously-discharged sewage is subjected to pressure-reducing and temperature-reducing to generate first-stage drainage and first-stage water vapor; the storage bin heating assembly receives the first-stage drain water and heats the storage bin through heat release of the first-stage drain water, and the second-stage drain water pressure and temperature reduction system receives the first-stage drain water subjected to heat release and conducts pressure and temperature reduction on the first-stage drain water subjected to heat release to reach the second-stage set temperature and the second-stage set pressure. According to the waste heat recycling device for the continuously-discharged sewage of the boiler, energy in the continuously-discharged sewage is recycled, the use frequency of other energy heating devices is reduced, and the overall energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy utilization, in particular to a boiler sewage waste heat recovery and utilization device. Background Art

[0002] In some municipal solid waste incineration power generation projects, in order to ensure the quality of boiler steam, the boiler is usually continuously discharged, that is, part of the boiler water with high salt content is discharged to the drain expansion tank. After it drops to ambient pressure, the water vapor is directly discharged and the water is discharged to the circulating water pool or recycled water for reuse. However, the pressure (not less than 4MPa) and temperature (not less than 250℃) of the discharged boiler water are relatively high, and this part of the energy is ineffectively released in the drain expansion tank, resulting in energy waste. At the same time, there are some storage bins in the municipal solid waste incineration power generation projects that need to consume heat energy. In particular, in order to prevent the fly ash in the fly ash storage bin from getting damp and hardened, the municipal solid waste incineration power generation project has an electric heating device installed for the fly ash storage bin, which increases the energy consumption of the system operation.

[0003] It should be noted that the information disclosed in the above background technology section is only used for understanding the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0004] In order to solve the problems of low energy utilization and high energy consumption in existing garbage incineration power generation projects and to ensure the safe operation of the drainage system and the effective treatment of sewage, the utility model proposes a boiler sewage waste heat recovery and utilization device.

[0005] The technical problem of the utility model is solved by the following technical solutions:

[0006] A device for recovering waste heat from boiler sewage comprises a primary drain pressure reduction and cooling system, a secondary drain pressure reduction and cooling system, and a storage bin heating component. The primary drain pressure reduction and cooling system receives the sewage generated by the boiler and reduces the pressure and temperature of the sewage to a primary set temperature and a primary set pressure. The sewage generates primary drain and primary water vapor through pressure reduction and cooling. The storage bin heating component receives the primary drain and heats the storage bin through heat release from the primary drain. The secondary drain pressure reduction and cooling system receives the primary drain after heat release and reduces the pressure and temperature of the primary drain after heat release to a secondary set temperature and a secondary set pressure.

[0007] In some embodiments, the primary set temperature is 140-160° C., the primary set pressure is 0.4-0.6 MPa, the secondary set temperature is 80-100° C., and the secondary set pressure is 0.1 MPa.

[0008] In some embodiments, the first-level hydrophobic pressure reduction and temperature reduction system includes a first-level hydrophobic expansion tank, a first-level hydrophobic expansion tank maintenance drain valve, a first-level hydrophobic expansion tank isolation component, a first-level hydrophobic expansion tank safety valve, and the first-level hydrophobic expansion tank is used to reduce the pressure and temperature of the discharged sewage. The first-level hydrophobic expansion tank maintenance drain valve is used to drain the remaining water in the first-level hydrophobic expansion tank when the device is shut down. The first-level hydrophobic expansion isolation component is used to isolate the first-level hydrophobic expansion tank from the device during maintenance. The first-level hydrophobic expansion tank safety valve is used to perform emergency pressure relief when the first-level hydrophobic expansion tank is over-pressured.

[0009] In some embodiments, the primary hydrophobic expansion tank isolation assembly includes a primary hydrophobic expansion tank exhaust valve, a primary hydrophobic expansion tank water inlet valve, and a primary hydrophobic expansion tank outlet valve.

[0010] In some embodiments, the storage bin heating component includes a storage bin heating coil, a storage bin heating coil inlet and outlet water flow component, a storage bin heating coil maintenance drain valve, and a storage bin temperature measuring point. The storage bin heating coil inlet and outlet water flow component is used to monitor the storage bin heating coil inlet and outlet water flow values ​​to determine whether there is a water leakage. The storage bin heating coil maintenance drain valve is set at the lowest point of the storage bin heating coil. The storage bin heating coil maintenance drain valve is used to drain the remaining water in the device when the device is shut down. The storage bin temperature measuring point is used to monitor the internal temperature of the storage bin.

[0011] In some embodiments, the storage bin heating coil inlet and outlet water flow assembly includes a storage bin heating coil inlet flow meter, a storage bin heating coil outlet flow meter, a storage bin heating coil inlet and outlet water flow difference controller, a storage bin heating coil inlet pneumatic valve, a storage bin heating coil outlet pneumatic valve, and a storage bin heating coil bypass pneumatic valve. When the inlet and outlet water flow difference exceeds a set value, the storage bin heating coil inlet and outlet water flow difference controller will give an instruction to open the storage bin heating coil bypass pneumatic valve, and close the storage bin heating coil inlet pneumatic valve and the storage bin heating coil outlet pneumatic valve.

[0012] In some embodiments, the first-level hydrophobic pressure reduction and temperature reduction system includes a first-level hydrophobic expansion tank outlet water temperature measuring point, and the first-level hydrophobic expansion tank outlet water temperature measuring point is used to monitor the water inlet temperature of the storage bin heating coil, and the storage bin temperature measuring point is a fly ash storage bin temperature measuring point, and the fly ash storage bin temperature measuring point is used to monitor the internal temperature of the fly ash storage bin.

[0013] In some embodiments, the secondary hydrophobic pressure reduction and temperature reduction system includes the secondary hydrophobic expansion tank, the secondary hydrophobic expansion tank maintenance drain valve, the secondary hydrophobic expansion tank isolation component, and the secondary hydrophobic expansion tank safety valve. The secondary hydrophobic expansion tank decompresses and reduces the temperature of the primary hydrophobic expansion tank after heat release, and the primary hydrophobic expansion tank after heat release produces secondary hydrophobic expansion tank and secondary water vapor through decompression and temperature reduction. The secondary hydrophobic expansion tank maintenance drain valve is used to drain the remaining water in the secondary hydrophobic expansion tank when the device is shut down. The secondary hydrophobic expansion isolation component is used to isolate the secondary hydrophobic expansion tank from the device during maintenance. The secondary hydrophobic expansion tank safety valve is used to perform emergency pressure relief when the secondary hydrophobic expansion tank is over-pressured.

[0014] In some embodiments, the secondary hydrophobic expansion tank isolation assembly includes a secondary hydrophobic expansion tank exhaust valve, a secondary hydrophobic expansion tank inlet valve, and a secondary hydrophobic expansion tank outlet valve.

[0015] In some embodiments, it also includes a drain storage and delivery component, which is used to store and deliver the secondary drain, the primary water vapor and the secondary water vapor. The drain storage and delivery component includes a drain tank, a drain tank level gauge, a drain delivery pump, a drain tank maintenance drain valve, a drain delivery pump inlet manual valve, and a drain delivery pump outlet manual valve. The drain tank is used to store the secondary drain, the primary water vapor and the secondary water vapor; the drain tank level gauge is used to measure the tank liquid level. When the liquid level reaches the set height, the drain delivery pump is started to deliver the drain to the outside of the device; the drain tank maintenance drain valve is used to drain the remaining water in the device when the device is shut down; the drain delivery pump inlet manual valve and the drain delivery pump outlet manual valve are used to isolate the drain delivery pump from the device during maintenance.

[0016] The beneficial effects of the utility model compared with the prior art include:

[0017] The boiler sewage waste heat recovery device proposed in the utility model can heat the storage bin that requires heat energy by utilizing the sewage generated by the original boiler, thereby realizing the recovery and utilization of energy in the sewage, reducing the frequency of use of other energy heating devices, and thus reducing the overall energy consumption. At the same time, through the design of a first-level drain pressure reduction and temperature reduction system and a second-level drain pressure reduction and temperature reduction system, the drain pressure can be stably and effectively reduced and the system maintenance is convenient. In terms of safety, overpressure protection is provided and residual water is completely removed, thereby ensuring the safe operation of the drain system and the effective treatment of sewage.

[0018] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic structural diagram of a boiler sewage waste heat recovery and utilization device in an embodiment of the utility model.

[0020] Explanation of the reference numerals: 1-first-stage drain expansion tank; 11-first-stage drain expansion tank inspection and drainage valve; 12-first-stage drain expansion tank water inlet valve; 13-first-stage drain expansion tank exhaust valve; 14-first-stage drain expansion tank safety valve; 15-first-stage drain expansion tank outlet valve; 16-first-stage drain expansion tank outlet water temperature measuring point; 2-fly ash storage bin; 21-fly ash storage bin heating coil; 22-fly ash storage bin heating coil bypass pneumatic valve; 23-fly ash storage bin heating coil water outlet flowmeter; 24-fly ash storage bin heating coil water outlet pneumatic valve; 25-fly ash storage bin temperature measuring point; 26-fly ash storage bin heating coil inlet and outlet water flow difference Value controller; 27-fly ash storage bin heating coil maintenance drain valve; 28-fly ash storage bin heating coil water inlet flowmeter; 29-fly ash storage bin heating coil water inlet pneumatic valve; 3-secondary drain expansion tank; 31-secondary drain expansion tank exhaust valve; 32-secondary drain expansion tank safety valve; 33-secondary drain expansion tank inlet valve; 34-secondary drain expansion tank outlet valve; 35-secondary drain expansion tank maintenance drain valve; 4-drain storage tank; 41-drain storage tank level gauge; 42-drain storage tank maintenance drain valve; 43-drain transfer pump inlet manual valve; 44-drain transfer pump; 45-drain transfer pump outlet manual valve. DETAILED DESCRIPTION

[0021] The present invention is further described below with reference to the accompanying drawings and in combination with preferred embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0022] It should be noted that the directional terms such as left, right, up, down, top, and bottom in this embodiment are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0023] The utility model embodiment shows a boiler sewage waste heat recovery and utilization device, which is characterized in that it includes a primary drain pressure reduction and cooling system, a secondary drain pressure reduction and cooling system, and a storage bin heating component. The primary drain pressure reduction and cooling system receives the sewage generated by the boiler and reduces the pressure and temperature of the sewage to a primary set temperature and a primary set pressure. The sewage produces primary drain and primary water vapor through pressure reduction and temperature reduction. The storage bin heating component receives the primary drain and heats the storage bin through the heat release of the primary drain. The secondary drain pressure reduction and cooling system receives the primary drain after heat release and reduces the pressure and temperature of the primary drain after heat release to a secondary set temperature and a secondary set pressure. Among them, the storage bin is preferably a fly ash storage bin 2. Usually, in order to prevent the fly ash in the fly ash storage bin 2 from getting damp and hardening, an electric heating device is provided for the fly ash storage bin 2 in existing domestic waste incineration power generation projects. This will increase the energy consumption of the system operation. The boiler sewage waste heat recovery and utilization device proposed in the embodiment of the utility model utilizes the sewage generated by the original boiler to heat the fly ash storage bin 2 to reduce the risk of fly ash getting damp, reduce the frequency of use of other energy heating devices, and thus reduce the overall energy consumption.

[0024] The primary hydrophobic pressure reduction and temperature reduction system described in the embodiment of the utility model includes a primary hydrophobic expansion tank 1, a primary hydrophobic expansion tank maintenance drain valve 11, a primary hydrophobic expansion tank isolation component, a primary hydrophobic expansion tank safety valve 14, and the primary hydrophobic expansion tank 1 reduces the pressure and temperature of the continuous discharge sewage. The primary hydrophobic expansion tank maintenance drain valve 11 is used to drain the remaining water in the hydrophobic expansion tank when the device is shut down. The primary hydrophobic expansion isolation component is used to isolate the primary hydrophobic expansion tank 1 from the device during maintenance. The primary hydrophobic expansion tank safety valve 14 is used to perform emergency pressure relief when the primary hydrophobic expansion tank 1 is over-pressured. The primary hydrophobic expansion tank isolation component is a primary hydrophobic expansion tank exhaust valve 13, a primary hydrophobic expansion tank water inlet valve 12, and a primary hydrophobic expansion tank outlet valve 15. At the same time, the scheme in the embodiment of the utility model is designed to lead the boiler sewage to the first-level drain expansion tank 1, reduce the pressure and temperature to the required temperature and pressure in the first-level drain expansion tank 1, and then rely on the pressure difference between the first-level drain expansion tank 1 and the second-level drain expansion tank 3 to make the drain flow through the fly ash storage bin 2 that needs to be heated to heat it, and then the drain flows into the second-level drain expansion tank 3, reduces the pressure and temperature to normal pressure, and then flows into the drain storage tank 4, and can be sent to the sewage treatment system for treatment through the drain delivery pump.

[0025] In the embodiment of the utility model, the first-level setting temperature is preferably 140-160°C, the first-level setting pressure is preferably 0.4-0.6MPa, the second-level setting temperature is preferably 80-100°C, and the second-level setting pressure is 0.1MPa.

[0026] In the embodiment of the utility model, the storage bin heating component includes a fly ash storage bin heating coil 21, a fly ash storage bin heating coil inlet and outlet water flow component, a fly ash storage bin heating coil maintenance drain valve 27, and a storage bin temperature measuring point. The fly ash storage bin heating coil inlet and outlet water flow component is used to monitor the fly ash storage bin heating coil inlet and outlet water flow values ​​to determine whether there is a water leakage. The fly ash storage bin heating coil inlet and outlet water flow values ​​include a water flow difference. The fly ash storage bin heating coil maintenance drain valve 27 is set at the lowest point of the fly ash storage bin heating coil 21. The fly ash storage bin heating coil maintenance drain valve 27 is used to drain the remaining water in the device when the device is shut down; the storage bin temperature measuring point is used to monitor the internal temperature of the storage bin. The storage bin temperature measuring point is preferably the fly ash storage bin temperature measuring point 25, which should be located at one-fifth of the depth of the storage bin. The third place is to ensure that the temperature measuring point can be inserted into the material in the storage bin most of the time. The fly ash storage bin temperature measuring point is used to monitor the internal temperature of the fly ash storage bin; the fly ash storage bin heating coil inlet and outlet water flow components are fly ash storage bin heating coil inlet flow meter 28, fly ash storage bin heating coil outlet flow meter 23, fly ash storage bin heating coil inlet and outlet water flow difference controller 26, fly ash storage bin heating coil inlet pneumatic valve 29, fly ash storage bin heating coil outlet pneumatic valve 24, fly ash storage bin heating coil bypass pneumatic valve 22. When the inlet and outlet water flow difference exceeds the set value, the storage bin heating coil inlet and outlet water flow difference controller 26 will give an instruction to open the fly ash storage bin heating coil bypass pneumatic valve 22, and close the fly ash storage bin heating coil inlet pneumatic valve 29 and the fly ash storage bin heating coil outlet pneumatic valve 24.

[0027] In the embodiment of the utility model, a first-level hydrophobic expansion tank outlet water temperature measuring point 16 is further provided in the first-level hydrophobic pressure reduction and temperature reduction system. The first-level hydrophobic expansion tank outlet water temperature measuring point 16 is used to monitor the water inlet temperature of the fly ash storage bin heating coil 21. The first-level hydrophobic expansion tank outlet water temperature measuring point 16 only needs to be located from the first-level hydrophobic expansion tank outlet to the storage bin heating coil inlet without special requirements. The storage bin heating component includes a fly ash storage bin temperature measuring point 25, and the fly ash storage bin temperature measuring point 25 is used to monitor the internal temperature of the fly ash storage bin 2.

[0028] In the embodiment of the utility model, the secondary drain pressure reduction and temperature reduction system comprises the secondary drain expansion tank 3, the secondary drain expansion tank maintenance drain valve 35, the secondary drain expansion tank isolation component, and the secondary drain expansion tank safety valve 32. The secondary drain expansion tank 3 reduces pressure and temperature on the primary drain after heat release, and the primary drain after heat release generates secondary drain and secondary water vapor by reducing pressure and temperature. The secondary drain expansion tank maintenance drain valve 35 is used to drain the remaining water in the drain expansion tank when the device is shut down. The secondary drain expansion isolation component is used to isolate the secondary drain expansion tank from the device during maintenance. The secondary drain expansion tank safety valve 32 is used to perform emergency pressure relief when the secondary drain expansion tank 3 is over-pressured. The secondary drain expansion tank isolation component is a secondary drain expansion tank exhaust valve 31, a secondary drain expansion tank inlet valve 33, and a secondary drain expansion tank outlet valve 34. In the secondary drain pressure reduction and temperature reduction system, the secondary drain expansion tank 3 is used to reduce the pressure and temperature of the primary drain after heat release, so as to produce secondary drain and secondary water vapor. At the same time, the secondary drain pressure reduction and temperature reduction system is also provided with a secondary drain expansion tank maintenance drain valve 35, a secondary drain expansion tank isolation assembly and a secondary drain expansion tank safety valve 32, which are respectively used to clean up the remaining water, perform device isolation operation during maintenance and emergency pressure relief. In this way, the normal operation and safety of the overall drain system can be ensured, and the stability and reliability of the overall drain system and the effective treatment of sewage can be improved.

[0029] In the embodiment of the utility model, the boiler sewage waste heat recovery and utilization device is also provided with a drain storage and delivery component, which is used to store and deliver the secondary drain, the primary water vapor and the secondary water vapor. The drain storage and delivery component includes a drain storage tank 4, a drain storage tank level gauge 41, a drain delivery pump 44, a drain storage tank maintenance drain valve 42, a drain delivery pump inlet manual valve 43, and a drain delivery pump outlet manual valve 45. The drain storage tank 4 is used to store the secondary drain, the primary water vapor and the secondary water vapor. Steam; the drain tank level gauge 41 is used to measure the tank liquid level. When the liquid level reaches the set height, the drain delivery pump 44 is started to deliver the drain to the outside of the device; the drain tank maintenance drain valve 42 is used to drain the remaining water in the device when the device is shut down; the drain delivery pump inlet manual valve 43 and the drain delivery pump outlet manual valve 45 are used to isolate the drain delivery pump 44 from the device during maintenance. At the same time, the water in the drain tank 4 is preferably at room temperature. The steam from the drain expansion tank is discharged into the drain tank 4, where it will be cooled and liquefied, and then collected.

[0030] The following is a supplementary explanation of the actual implementation plan and operations:

[0031] like Figure 1As shown, it is a schematic diagram of the structure of the waste heat recovery and utilization device of the boiler continuous discharge sewage in the embodiment of the utility model. It can be seen that in the embodiment of the utility model, the boiler continuous discharge sewage, under the action of its own gravity and the pressure difference between the boiler and the first-level steam expansion tank 1 (the principle of decompression and cooling of the steam expansion tank: after the pressure is reduced, the boiling point of the liquid will also be reduced, and the continuous discharge sewage of the boiler enters the steam expansion tank, the space suddenly becomes larger, the pressure becomes lower, and the boiling point of water also becomes lower, so part of the continuous discharge sewage is vaporized and takes away part of the heat, and the temperature of the remaining sewage is reduced to the saturation temperature corresponding to the pressure of the steam expansion tank. At the same time, the reason for the pressure difference is that the space in the steam expansion tank becomes larger, the pressure becomes smaller, and is smaller than the pressure on the boiler side, resulting in a pressure difference), passes through the first-level steam expansion tank inlet valve 12, and flows into the first-level steam expansion tank 1. After the continuous discharge sewage is decompressed and cooled therein, the water vapor generated uses the pressure difference to flow into the steam storage tank 4 below the liquid level through the first-level steam expansion tank exhaust valve 13, and is cooled and collected. The generated drain water flows into the fly ash storage bin heating coil 21 through the first-level drain expansion tank outlet valve 15 to heat the fly ash storage bin 2. Behind the first-level drain expansion tank outlet valve 15, a first-level drain expansion tank outlet water temperature measuring point 16 is provided to monitor the inlet water temperature of the fly ash storage bin heating coil 21. A first-level drain expansion tank safety valve 14 is provided on the top of the first-level drain expansion tank 1. When the internal pressure of the equipment exceeds the set value, the safety valve opens to release the pressure. A first-level drain expansion tank maintenance drain valve 11 is provided at the bottom of the first-level drain expansion tank 1. When the equipment (referring to the first-level drain expansion tank and the second-level drain expansion tank) needs to be emptied, the remaining water can be discharged into an external water demand device or a water storage device when the equipment is shut down, so that water resources can be recycled.

[0032] In the embodiment of the utility model, the drain from the primary drain expansion tank 1 flows into the fly ash storage bin heating coil 21 through the fly ash storage bin heating coil water inlet pneumatic valve 29 to heat the fly ash storage bin 2, and then flows into the secondary drain expansion tank 3 through the fly ash storage bin heating coil water outlet pneumatic valve 24 and the secondary drain expansion tank inlet valve 33. A fly ash storage bin heating coil inlet flowmeter 28 and a fly ash storage bin heating coil outlet flowmeter 23 are respectively arranged on the water inlet and outlet pipes of the fly ash storage bin heating coil 21. The flow signals collected by the above two flowmeters are sent to the fly ash storage bin heating coil inlet and outlet flow difference controller 26. If the inlet and outlet water flows are basically the same, no operation is performed. If the inlet and outlet water flows exceed the set value, and the set value is preferably that the inlet and outlet water flow deviation is greater than 5%, it proves that the fly ash storage bin heating coil 21 is leaking, and the fly ash storage bin heating coil inlet and outlet water flow difference controller 26 sends a signal to close the fly ash storage bin heating coil inlet pneumatic valve 29 and the fly ash storage bin heating coil outlet pneumatic valve 24. In addition, a fly ash storage bin heating coil maintenance drain valve 27 is provided at the lowest point of the fly ash storage bin heating coil 21, which is used to drain the water in the pipeline during equipment maintenance; the heating effect of the fly ash storage bin heating coil 21 can be observed through the fly ash storage bin temperature measuring point 25.

[0033] In the embodiment of the utility model, the drain water heated by the fly ash storage bin 2 flows into the secondary drain expansion tank 3 through the secondary drain expansion tank inlet valve 33 and is decompressed to normal pressure. The generated water vapor flows into the drain storage tank 4 below the liquid level through the secondary drain expansion tank exhaust valve 31 and is cooled and collected. The generated drain water flows into the drain storage tank 4 through the secondary drain expansion tank outlet valve 34 under the action of gravity. The secondary drain expansion tank 3 is provided with a secondary drain expansion tank safety valve 32. When the internal pressure of the equipment exceeds the set value, the safety valve opens to release the pressure. The function of the secondary drain expansion tank maintenance drain valve 35 is to empty the water stored in the tank when the equipment is under maintenance.

[0034] The function of the hydrophobic storage tank 4 in the embodiment of the utility model is to collect the hydrophobic water from the secondary hydrophobic expansion tank 3, and at the same time cool and collect the exhaust gas from the primary hydrophobic expansion tank 1 and the secondary hydrophobic expansion tank 3. When the liquid level of the storage tank measured by the hydrophobic storage tank level gauge 41 reaches the set value, the set value is preferably three quarters of the height of the storage tank, and the hydrophobic delivery pump 44 is interlocked to start the hydrophobic storage tank to deliver the liquid in the tank to the sewage treatment system for treatment. A hydrophobic storage tank maintenance drain valve 42 is provided at the bottom of the hydrophobic storage tank 4, which is used to drain the water in the tank during equipment maintenance. The inlet and outlet of the hydrophobic delivery pump 44 are respectively provided with a hydrophobic delivery pump inlet manual valve 43 and a hydrophobic delivery pump outlet manual valve 45, which are used to isolate the hydrophobic delivery pump 44 from the system when the hydrophobic delivery pump 44 is overhauled.

[0035] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For technicians in the technical field to which the present invention belongs, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A boiler wastewater waste heat recovery and utilization device, characterized in that: It includes a primary drain pressure reduction and temperature reduction system, a secondary drain pressure reduction and temperature reduction system, and a storage bin heating component. The primary drain pressure reduction and temperature reduction system receives the continuous discharge sewage generated by the boiler and reduces the pressure and temperature of the continuous discharge sewage to a primary set temperature and a primary set pressure. The continuous discharge sewage produces primary drain and primary water vapor through pressure reduction and temperature reduction. The storage bin heating component receives the primary drain and heats the storage bin through the heat release of the primary drain. The secondary drain pressure reduction and temperature reduction system receives the primary drain after heat release and reduces the pressure and temperature of the primary drain after heat release to a secondary set temperature and a secondary set pressure.

2. The boiler wastewater waste heat recovery and utilization device according to claim 1, characterized in that: The first-stage set temperature is 140-160°C, the first-stage set pressure is 0.4-0.6MPa, the second-stage set temperature is 80-100°C, and the second-stage set pressure is 0.1MPa.

3. The boiler wastewater waste heat recovery and utilization device according to claim 1, characterized in that: The primary hydrophobic pressure reduction and temperature reduction system includes a primary hydrophobic expansion tank, a primary hydrophobic expansion tank maintenance drain valve, a primary hydrophobic expansion tank isolation component, a primary hydrophobic expansion tank safety valve, and the primary hydrophobic expansion tank reduces the pressure and temperature of the continuously discharged sewage. The primary hydrophobic expansion tank maintenance drain valve is used to drain the remaining water in the primary hydrophobic expansion tank when the device is shut down. The primary hydrophobic expansion isolation component is used to isolate the primary hydrophobic expansion tank from the device during maintenance. The primary hydrophobic expansion tank safety valve is used to perform emergency pressure relief when the primary hydrophobic expansion tank is over-pressured.

4. The boiler wastewater waste heat recovery and utilization device according to claim 3, characterized in that: The primary hydrophobic expansion tank isolation assembly comprises a primary hydrophobic expansion tank exhaust valve, a primary hydrophobic expansion tank water inlet valve, and a primary hydrophobic expansion tank outlet valve.

5. The boiler wastewater waste heat recovery and utilization device according to claim 1, characterized in that: The storage bin heating component includes a storage bin heating coil, a storage bin heating coil inlet and outlet water flow component, a storage bin heating coil maintenance drain valve, and a storage bin temperature measuring point. The storage bin heating coil inlet and outlet water flow component is used to monitor the storage bin heating coil inlet and outlet water flow values ​​to determine whether there is a water leakage. The storage bin heating coil maintenance drain valve is set at the lowest point of the storage bin heating coil. The storage bin heating coil maintenance drain valve is used to drain the remaining water in the device when the device is shut down. The storage bin temperature measuring point is used to monitor the internal temperature of the storage bin.

6. The boiler wastewater waste heat recovery and utilization device according to claim 5, characterized in that: The storage bin heating coil water inlet and outlet flow components include a storage bin heating coil water inlet flow meter, a storage bin heating coil water outlet flow meter, a storage bin heating coil water inlet and outlet flow difference controller, a storage bin heating coil water inlet pneumatic valve, a storage bin heating coil water outlet pneumatic valve, and a storage bin heating coil bypass pneumatic valve. When the inlet and outlet water flow difference exceeds a set value, the storage bin heating coil water inlet and outlet flow difference controller will give an instruction to open the storage bin heating coil bypass pneumatic valve and close the storage bin heating coil water inlet pneumatic valve and the storage bin heating coil water outlet pneumatic valve.

7. The boiler wastewater waste heat recovery and utilization device according to claim 5, characterized in that: The first-level hydrophobic pressure reduction and temperature reduction system includes a first-level hydrophobic expansion tank outlet water temperature measuring point, which is used to monitor the water inlet temperature of the storage bin heating coil. The storage bin temperature measuring point is a fly ash storage bin temperature measuring point, which is used to monitor the internal temperature of the fly ash storage bin.

8. The boiler wastewater waste heat recovery and utilization device according to claim 1, characterized in that: The secondary drain pressure reduction and temperature reduction system includes the secondary drain expansion tank, the secondary drain expansion tank maintenance drain valve, the secondary drain expansion tank isolation component, and the secondary drain expansion tank safety valve. The secondary drain expansion tank reduces pressure and reduces temperature on the primary drain after heat release. The primary drain after heat release generates secondary drain and secondary water vapor through pressure reduction and temperature reduction. The secondary drain expansion tank maintenance drain valve is used to drain the remaining water in the secondary drain expansion tank when the device is shut down. The secondary drain expansion isolation component is used to isolate the secondary drain expansion tank from the device during maintenance. The secondary drain expansion tank safety valve is used to perform emergency pressure relief when the secondary drain expansion tank is over-pressured.

9. The boiler wastewater waste heat recovery and utilization device according to claim 8, characterized in that: The secondary hydrophobic expansion tank isolation component includes a secondary hydrophobic expansion tank exhaust valve, a secondary hydrophobic expansion tank inlet valve, and a secondary hydrophobic expansion tank outlet valve.

10. The boiler wastewater waste heat recovery and utilization device according to claim 8, characterized in that: It also includes a drain storage and delivery component, which is used to store and deliver the secondary drain, the primary water vapor and the secondary water vapor. The drain storage and delivery component includes a drain tank, a drain tank level gauge, a drain delivery pump, a drain tank maintenance drain valve, a drain delivery pump inlet manual valve, and a drain delivery pump outlet manual valve. The drain tank is used to store the secondary drain, the primary water vapor and the secondary water vapor; the drain tank level gauge is used to measure the tank liquid level. When the liquid level reaches the set height, the drain delivery pump is started to deliver the drain to the outside of the device; the drain tank maintenance drain valve is used to drain the remaining water in the device when the device is shut down; the drain delivery pump inlet manual valve and the drain delivery pump outlet manual valve are used to isolate the drain delivery pump from the device during maintenance.

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