Hydrophobic circulation recovery system and method for garbage power plant
By introducing components such as a hydrophobic expansion tank, condenser, and heater into the hydrophobic circulation recovery system, the problem of unutilized heat from the steam preheater was solved, the heat recovery rate was improved, energy was saved, and the normal operation of the steam preheater was ensured.
Patent Information
- Application Number
- CN202411394690.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-01-07
AI Technical Summary
In the existing technology, the heat of steam discharged from the steam preheater is not effectively utilized, resulting in a low heat recovery rate of the hydrophobic circulation recovery system.
By introducing components such as a condensate expansion tank, condenser, first heater, and deaerator into the condensate circulation and recovery system, the heat of the steam output from the condensate expansion tank and the condensate generated by the condenser are exchanged using the first heater, and the condensate is heated, thereby improving the heat utilization rate of the steam.
It improves the heat utilization rate of steam, saves energy, and removes condensate or deposits from the steam preheater through the steam storage container, ensuring the normal operation of the steam preheater.
Smart Images
Figure CN119267887A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waste incineration, and in particular to a drainage recycling system and method for a waste power plant. Background Art
[0002] In order to alleviate urban waste pollution, countries around the world are committed to the research on comprehensive waste management and utilization, especially the safety of waste incineration and the efficient recovery of heat energy during the waste incineration process, which are receiving more and more attention.
[0003] In the related technology, the garbage in the garbage incinerator is burned at a high temperature of 850℃~1100℃, and the high-temperature flue gas generated is heat exchanged in the waste heat boiler to generate superheated steam, which drives the steam turbine to generate electricity. The superheated steam will be sent to the steam preheater to heat the air entering the garbage incinerator. The steam discharged from the steam preheater will be liquefied into hydrophobic water and reused.
[0004] Regarding the above-mentioned related technologies, the inventors believe that when the steam preheater liquefies the exhausted steam, the steam will also release heat, but the related technologies do not utilize this part of the heat, resulting in a waste of steam heat and a low heat recovery rate of the drain circulation recovery system. Summary of the invention
[0005] In order to improve the heat recovery rate of the drain circulation recovery system, the present application provides a drain circulation recovery system and method for a waste power plant.
[0006] In the first aspect, the present application provides a drainage recycling system for a waste power plant, which adopts the following technical solution: A drainage recycling system for a garbage power plant, comprising: a boiler, a steam turbine, a steam preheater, a drainage expansion tank, a condenser, a first heater, and a deaerator; The boiler is connected to the steam turbine, the boiler is used to provide steam to the steam turbine, the steam turbine is connected to the steam preheater, the steam preheater is connected to the steam trap expansion tank, the steam preheater is used to exchange heat between the steam and the air entering the boiler, and the steam trap expansion tank includes a water outlet and a steam exhaust port; The water outlet of the hydrophobic expansion tank is connected to the deaerator; The exhaust port of the drain expansion tank is connected to the first heater. The first heater, the condenser and the deaerator are connected in sequence along the pipeline. The condenser is used to condense steam into drain. The heat generated by the condenser is used to exchange heat with the air entering the boiler. The first heater is used to exchange heat between the steam output from the drain expansion tank and the drain generated by the condenser. The deaerator is connected to the boiler and is used to provide drain water to the boiler.
[0007] By adopting the above technical solution, the first heater can be used to exchange the heat of the steam output by the drain expansion tank and the drain generated by the condenser, thereby improving the heat utilization rate of the steam. Moreover, the drain is also heated so that the drain entering the deaerator has a certain temperature, saving energy.
[0008] Optionally, the first opening of the steam storage container is arranged at the steam inlet of the steam preheater, the second opening of the steam storage container is arranged at the steam inlet of the condenser, and a control valve is arranged on the pipeline between the turbine and the steam preheater, and the steam in the steam storage container flows from the first opening to the second opening, or the steam in the steam storage container flows from the second opening to the first opening.
[0009] Optionally, the steam inlet of the second heater is connected to the steam turbine, the steam exhaust port of the second heater is connected to the condenser, the second heater is used to exchange heat between the drain output by the drain expansion tank and the steam output by the steam turbine, the steam inlet of the third heater is connected to the steam turbine, the steam exhaust port of the third heater is connected to the condenser, and the third heater is used to exchange heat between the drain generated by the condenser and the steam output by the steam turbine.
[0010] In a second aspect, the present application provides a method for recycling drainage in a waste-to-energy plant, which adopts the following technical solution: A method for recycling drainage water in a garbage power plant, applied to the above drainage water recycling system, comprises: In response to the startup operation, the steam output from the steam turbine is sent to the steam preheater, and the steam output from the steam preheater is sent to the steam trap expansion tank; When it is detected that the internal pressure of the drain expansion tank meets the starting pressure, the drain output from the drain expansion tank is sent to the deaerator, and the steam output from the drain expansion tank is sent to the condenser; When the amount of drain water in the deaerator reaches the preset amount of drain water, the drain water in the deaerator is sent to the boiler.
[0011] By adopting the above technical solution, the first heater can be used to exchange the heat of the steam output by the drain expansion tank and the drain generated by the condenser, thereby improving the heat utilization rate of the steam. Moreover, the drain is also heated so that the drain entering the deaerator has a certain temperature, saving energy.
[0012] Optionally, when it is detected that the steam output temperature of the steam preheater does not match the preset temperature, the steam in the second heater and the third heater is sent to the drain expansion tank; Close the exhaust port of the steam preheater.
[0013] By adopting the above technical solution, the steam in the second heater and the third heater can be sent to the drain expansion tank, and the function of the steam preheater can be temporarily shut down to facilitate inspection by technical personnel.
[0014] Optionally, when it is detected that the steam output temperature is greater than the maximum temperature warning value, the steam output by the steam turbine is sent to the steam storage container; When the internal pressure of the steam storage container is greater than the preset pressure, the control valve is closed and the exhaust port of the steam preheater is opened; Control the steam storage container to release high-pressure steam to the steam preheater through the steam inlet.
[0015] By adopting the above technical solution, a steam storage container can be used to contain steam, and high-pressure steam can be used to remove excess hydrophobicity or sediment in the steam preheater to ensure the normal operation of the steam preheater.
[0016] Optionally, open the exhaust port and control valve of the steam preheater; Controlling the first opening of the steam storage container to remain open, so as to reduce the amount of steam entering the steam preheater; obtaining a steam input temperature, a first steam flow rate entering the steam storage container, and a second steam flow rate leaving the steam storage container; When the steam output temperature and the steam input temperature satisfy a first preset relationship, and the first steam flow rate and the second steam flow rate satisfy a second preset relationship, the first opening of the steam storage container is closed, and the steam in the second heater and the third heater is sent to the condenser.
[0017] By adopting the above technical solution, after cleaning the steam preheater, the steam flow entering the steam preheater is reduced, and the steam output temperature and steam flow are detected in real time until the steam output temperature and steam flow are qualified, and then the steam preheater is allowed to work normally.
[0018] Optionally, when it is detected that the condensed gas pressure at the steam inlet of the condenser is greater than the maximum gas pressure, the first opening and the second opening of the steam storage container are opened; The steam is controlled to enter from the second opening of the steam storage container and to leave from the first opening of the steam storage container.
[0019] By adopting the above technical solution, the steam storage container can relieve the steam pressure on one side of the condenser, thus preventing the condenser from being damaged by excessive steam pressure.
[0020] Optionally, when it is detected that the steam output temperature is less than the minimum temperature warning value, a first steam flow rate and a steam input temperature of the steam entering the steam preheater are obtained; predicting a future temperature of the steam preheater within a preset period of time based on the first steam flow rate, the steam output temperature, and the steam input temperature; If the future temperature within the preset time period is always less than the minimum temperature warning value, opening the first opening and the second opening of the steam storage container; The steam is controlled to enter from the first opening of the steam storage container, and the steam is controlled to leave from the second opening of the steam storage container.
[0021] By adopting the above technical solution, the amount of steam entering the steam preheater can be reduced, preventing the temperature of the steam preheater from being too high and affecting the normal operation of the steam preheater.
[0022] Optionally, obtaining the condensed gas pressure at the steam inlet of the condenser; When the condensed gas pressure is greater than the upper limit of the gas pressure, the first flow rate and the second flow rate of the steam are calculated according to the condensed gas pressure and the upper limit of the gas pressure; sending the steam outputted from the drain expansion tank into the condenser at a first flow rate; The steam output from the drain expansion tank is fed into the first heater at a second flow rate.
[0023] By adopting the above technical solution, the steam flow rates of the condenser and the first heater can be adjusted to prevent the condenser from being damaged due to excessive steam flow rates.
[0024] In a third aspect, the present application provides a smart terminal, which adopts the following technical solution: An intelligent terminal comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and executed as described in any of the above methods.
[0025] In a fourth aspect, the present application provides a computer storage medium capable of storing a corresponding program, which has the characteristic of facilitating the improvement of the heat recovery rate of the hydrophobic recycling system, and adopts the following technical solution: A computer-readable storage medium stores a computer program that can be loaded by a processor and execute any of the above-mentioned drainage recycling methods for waste-to-energy plants.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first heater can be used to exchange the heat of the steam output from the drain expansion tank and the drain generated by the condenser, thereby improving the heat utilization rate of the steam. In addition, the drain is heated so that the drain entering the deaerator has a certain temperature, thus saving energy; 2. Steam storage containers can be used to hold steam, and high-pressure steam can be used to remove excess hydrophobicity or sediment in the steam preheater to ensure the normal operation of the steam preheater; 3. After cleaning the steam preheater, reduce the steam flow entering the steam preheater, and conduct real-time detection of the steam output temperature and steam flow until the steam output temperature and steam flow are qualified, and then allow the steam preheater to work normally. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of a drainage circulation recovery system of a waste power plant provided in an embodiment of the present application.
[0028] Figure 2 It is a flow chart of a method for recycling drainage in a waste-to-energy plant provided in an embodiment of the present application.
[0029] Figure 3 It is a flow chart of a method for recycling drainage in a waste-to-energy plant provided in an embodiment of the present application.
[0030] Figure 4 It is a flow chart of a method for using a steam preheater provided in an embodiment of the present application.
[0031] Figure 5 It is a flow chart of a method for using a steam storage container provided in an embodiment of the present application.
[0032] Figure 6 It is a flow chart of a method for using a steam preheater provided in an embodiment of the present application.
[0033] Figure 7 It is a flow chart of a method for recycling drainage in a waste-to-energy plant provided in an embodiment of the present application.
[0034] Figure 8 It is a flow chart of a method for using a steam storage container provided in an embodiment of the present application.
[0035] Explanation of the reference numerals: 10. boiler; 11. steam turbine; 111. control valve; 12. steam preheater; 13. drain expansion tank; 14. condenser; 15. first heater; 16. deaerator; 17. steam storage container; 171. first air pump; 172. second air pump; 18. second heater; 19. third heater. DETAILED DESCRIPTION
[0036] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-8 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0037] The present application embodiment discloses a drainage recycling system for a garbage power plant. Figure 1 The drain circulation recovery system includes a boiler 10, a steam turbine 11, a steam preheater 12, a drain expansion tank 13, a condenser 14, a first heater 15, and a deaerator 16.
[0038] In some embodiments, the boiler 10 may include a waste incinerator and a preheating boiler 10, wherein the waste incinerator is used to convert the chemical energy of waste into thermal energy, and the heat generated by the waste incinerator can heat the water in the preheating boiler 10 to make it superheated steam with sufficient quantity and certain quality (or certain steam temperature, certain steam pressure) for use by the steam turbine 11.
[0039] In some embodiments, the steam turbine 11 converts the kinetic energy of the steam into electrical energy and sends the steam to the steam preheater 12 .
[0040] In some embodiments, the steam preheater 12 transfers the heat of the steam to the air entering the waste incinerator, thereby increasing the combustion temperature, reducing fuel consumption, and reducing the emission of pollutants. In some embodiments, the steam preheater 12 includes a high-pressure steam preheating section and a low-pressure steam preheating section, which use steam of different pressure levels for heating respectively, and the high-pressure steam preheating section and the low-pressure steam preheating section are arranged in sequence, and the steam first enters the high-pressure steam preheating section for heat exchange, and then the steam enters the low-pressure steam preheating section for heat exchange.
[0041] In some embodiments, the drain expander 13 receives the steam and drain mixture from the steam preheater 12. The drain expander 13 can expand and depressurize the mixture to recover steam and drain.
[0042] In some embodiments, the condenser 14 is used to cool and condense the steam to obtain water. The heat generated by the condenser 14 is used to exchange heat with the air entering the boiler 10.
[0043] In some embodiments, the deaerator 16 is used to remove dissolved oxygen and other gases in the hydrophobic water. Optionally, the deaerator 16 can reduce the solubility of oxygen in the water by high temperature, thereby removing oxygen from the water, or the deaerator 16 can convert oxygen in the water into other substances by utilizing chemical reactions to achieve the purpose of deoxygenation.
[0044] The boiler 10 is connected to the steam turbine 11. The boiler 10 is used to provide steam to the steam turbine 11. The steam turbine 11 is connected to the steam preheater. The steam preheater 12 is connected to the drain expansion tank 13. The steam preheater 12 is used to exchange heat between steam and air entering the boiler 10. The drain expansion tank 13 includes a water outlet and a steam exhaust port. The water outlet of the drain expansion tank 13 is used to discharge drain, and the steam exhaust port of the drain expansion tank 13 is used to discharge steam.
[0045] The water outlet of the hydrophobic expansion tank 13 is communicated with the deaerator 16 .
[0046] The exhaust port of the drain expansion tank 13 is connected to the first heater 15. The first heater 15, the condenser 14 and the deaerator 16 are connected in sequence along the pipeline. The condenser 14 is used to condense steam into drain. The heat generated by the condenser 14 is used to exchange heat with the air entering the boiler 10. The first heater 15 is used to exchange heat between the steam output by the drain expansion tank 13 and the drain generated by the condenser 14.
[0047] The deaerator 16 is connected to the boiler 10 , and is used to provide drain water to the boiler 10 .
[0048] Further, the first opening of the steam storage container 17 is arranged at the steam inlet of the steam preheater 12, the second opening of the steam storage container 17 is arranged at the steam inlet of the condenser 14, and a control valve 111 is arranged on the pipeline between the steam turbine 11 and the steam preheater 12, and the steam in the steam storage container 17 flows from the first opening to the second opening, or the steam in the steam storage container 17 flows from the second opening to the first opening. The flow direction of the steam in the steam storage container 17 can be determined by the air pump in the steam storage container 17.
[0049] Further, the steam inlet of the second heater 18 is connected to the steam turbine 11, the steam outlet of the second heater 18 is connected to the condenser, and the second heater 18 is used to exchange the heat of the drain output from the drain expansion tank 13 and the steam output from the steam turbine 11. The steam inlet of the third heater 19 is connected to the steam turbine 11, the steam outlet of the third heater 19 is connected to the condenser, and the third heater 19 is used to exchange the heat of the drain generated by the condenser 14 and the steam output from the steam turbine 11. In some other embodiments, the second heater 18 and the third heater 19 can also be used to exchange heat with the air entering the boiler 10. In some embodiments, the second heater 18 is also connected to the steam inlet of the drain expansion tank 13 through a pipeline (not shown in the figure), and the third heater 19 is also connected to the steam inlet of the drain expansion tank 13 through a pipeline (not shown in the figure).
[0050] In some embodiments, the steam storage container 17 can be a hydrophobic expansion tank, the first opening of the steam storage container 17 is the steam inlet of the hydrophobic expansion tank, the second opening of the steam storage container 17 is the steam exhaust port of the hydrophobic expansion tank, and the drain port of the steam storage container 17 can be connected to the deaerator 16 (not shown in the figure).
[0051] In some embodiments, a first air pump 171 is provided at the first opening of the steam storage container 17, and a second air pump 172 is provided at the second opening of the steam storage container 17. Through the operation of the first air pump 171 and the second air pump 172, the flow direction of steam inside the steam storage container 17 can be controlled. For example, turning on the first air pump 171 can control the steam to flow from the first opening to the second opening; turning on the second air pump 172 can control the steam to flow from the second opening to the first opening.
[0052] In some other embodiments, the exhaust port of the hydrophobic expansion tank is further connected to a condenser, which can process the steam exhausted from the hydrophobic expansion tank and condense it into hydrophobic water.
[0053] In summary, the drain recycling system can use the first heater to exchange the heat of the steam output from the drain expansion tank and the drain generated by the condenser, thereby improving the heat utilization rate of the steam. Moreover, the drain is heated so that the drain entering the deaerator has a certain temperature, thereby saving energy.
[0054] The present application also discloses a method for recycling drainage water in a waste power plant. Figure 1 The drainage recycling system of the waste power plant shown in the figure is implemented as follows: Figure 2 , the hydrophobic recycling method comprises: Step S201: In response to the startup operation, the steam output by the steam turbine is sent to the steam preheater, and the steam output by the steam preheater is sent to the drain expansion tank.
[0055] In some embodiments, the startup operation is used to start the steam turbine. Further, since the steam turbine needs to be provided with steam of sufficient pressure in order to work properly, the steam in the boiler is fed into the steam turbine when the steam pressure generated by the boiler reaches a preset steam pressure.
[0056] In some embodiments, the steam preheater includes a high-pressure steam preheating section and a low-pressure steam preheating section, which use steam of different pressure levels for heating, and the high-pressure steam preheating section and the low-pressure steam preheating section are arranged in sequence.
[0057] Step S202: When it is detected that the internal pressure of the drain expansion tank meets the starting pressure, the drain output from the drain expansion tank is sent to the deaerator, and the steam output from the drain expansion tank is sent to the condenser.
[0058] The starting pressure refers to the minimum gas pressure required for the hydrophobic expansion tank to separate the hydrophobic and steam. The starting pressure can be adjusted according to actual needs, and the embodiments of the present application do not specifically limit this.
[0059] In some embodiments, the deaerator may reduce the solubility of oxygen in water by high temperature, thereby removing oxygen from water. Alternatively, the deaerator may convert oxygen in water into other substances by utilizing chemical reactions to achieve the purpose of deoxygenation.
[0060] Step S203: When the amount of drain water in the deaerator reaches a preset amount of drain water, the drain water in the deaerator is sent to the boiler.
[0061] The preset drain volume can be adjusted according to actual needs, and the embodiments of the present application do not specifically limit this. Further, the drain in the deaerator needs to have a certain water pressure before the drain can be transported to the boiler. Therefore, the drain in the deaerator can also be transported to the boiler when the water pressure of the drain in the deaerator reaches the preset water pressure.
[0062] In summary, by adopting the above technical scheme, the first heater can be used to exchange the heat of the steam output by the drain expansion tank and the drain generated by the condenser, thereby improving the heat utilization rate of the steam. Moreover, the drain is also heated so that the drain entering the deaerator has a certain temperature, saving energy.
[0063] In the following embodiment, since the steam preheater requires frequent heat exchange, it is easy for drainage to accumulate in the pipe of the steam preheater, affecting the normal operation of the steam preheater. To solve the above problem, Figure 3 A schematic flow chart of a method for recycling drainage in a waste-to-energy plant provided in an embodiment of the present application is shown, the method comprising: Step S301: When it is detected that the steam output temperature of the steam preheater does not match the preset temperature, the steam in the second heater and the third heater is sent to the drain expansion tank.
[0064] Since the structural strength of the condenser is relatively low, when the branches of the third heater and the fourth heater are needed to share all the steam generated by the steam turbine, if all the steam in the third heater and the fourth heater enters the condenser, the air pressure at the condenser will increase, which may cause damage to the condenser. On the other hand, the steam expansion tank requires the air to withstand a large air pressure due to its design. Therefore, in this step, the steam in the second heater and the third heater is sent to the steam expansion tank, which can prevent the condenser from being damaged in the subsequent process and protect the normal operation of the condenser.
[0065] The preset temperature is a pre-set temperature range, and the preset temperature includes a minimum temperature warning value and a maximum temperature warning value. The minimum temperature warning value and the maximum temperature warning value can be adjusted according to actual needs. The specific values of the minimum temperature warning value and the maximum temperature warning value are not specifically limited in the embodiment of the present application. In the embodiment of the present application, there are two situations where the steam output temperature does not match the preset temperature: one, the steam output temperature is greater than the maximum temperature warning value; two, the steam output temperature is less than the minimum temperature warning value. The implementation contents of the above two are as follows: 1. The steam output temperature is greater than the maximum temperature warning value.
[0066] If the steam output temperature is greater than the maximum temperature warning value, it means that the heat exchange efficiency of the steam preheater is low, and there may be a lot of hydrophobicity or sediment inside the steam preheater, which affects the heat exchange of the steam preheater. To this end, the embodiment of the present application provides a method for using a steam preheater, which includes steps S401 to S403, and the specific contents include: Step S401: When it is detected that the steam output temperature is greater than the maximum temperature warning value, the steam output by the steam turbine is sent to the steam storage container.
[0067] Optionally, a temperature sensor is provided at the exhaust port of the steam preheater, and the temperature sensor is used to detect the steam output temperature.
[0068] In some embodiments, a first air pump is provided at the first opening of the steam storage container, and the first air pump can deliver the steam output by the steam turbine into the steam storage container. Further, the steam storage container can store high-pressure steam.
[0069] Step S402: When the internal pressure of the steam storage container is greater than the preset pressure, the control valve is closed and the exhaust port of the steam preheater is opened.
[0070] The preset pressure is greater than the pressure of the steam output by the steam turbine.
[0071] In some embodiments, after the control valve is closed, the steam output by the steam turbine no longer enters the steam preheater, but enters the second heater and the third heater. Therefore, the steam turbine can still work normally and will not affect the normal power generation of the waste power plant.
[0072] In some embodiments, an air pressure sensor is disposed inside the steam storage container, and the air pressure sensor is used to detect the internal pressure of the steam storage container.
[0073] Step S403: Control the steam storage container to release high-pressure steam to the steam preheater through the steam inlet.
[0074] Furthermore, when the internal pressure of the steam storage container is greater than the preset pressure, the high-pressure steam released by the steam storage container is sufficient to discharge the hydrophobicity or sediment inside the steam preheater. Since the control valve has been closed, the high-pressure steam inside the steam storage container can only enter the steam preheater along the pipeline, thereby discharging the hydrophobicity or sediment inside the steam preheater.
[0075] In summary, by adopting the above technical solution, a steam storage container can be used to contain steam, and high-pressure steam can be used to remove excess hydrophobicity or sediment in the steam preheater to ensure the normal operation of the steam preheater.
[0076] Further, after the steam storage container discharges the high-pressure steam inside, considering that there may be damage inside the steam storage container, the embodiment of the present application uses the steam storage container to reduce the amount of steam entering the steam preheater, and detects whether there is damage inside the steam preheater. The method includes steps S501 to S504, and the specific contents are as follows: Step S501: Open the exhaust port and control valve of the steam preheater.
[0077] After opening the exhaust port and control valve of the steam preheater, the steam output from the turbine can pass through the steam preheater normally and complete the heat exchange.
[0078] Step S502: Control the first opening of the steam storage container to remain open, so as to reduce the amount of steam entering the steam preheater.
[0079] In some embodiments, the first air pump may be turned on to allow part of the steam output by the steam turbine to enter the steam storage container, thereby reducing the steam entering the steam preheater.
[0080] In some other embodiments, the first opening and the second opening of the steam storage container are controlled to be opened simultaneously, and part of the steam of the steam turbine enters from the first opening and flows out from the second opening after passing through the steam storage container, thereby reducing the steam entering the steam preheater.
[0081] Step S503: obtaining the steam input temperature, the first steam flow rate entering the steam storage container, and the second steam flow rate leaving the steam storage container.
[0082] Optionally, temperature sensors are provided at the first opening and the second opening of the steam storage container, and the temperature sensors are used to obtain the steam input temperature and the steam output temperature.
[0083] Optionally, flow sensors are provided at the first opening and the second opening of the steam storage container, and the flow sensors are used to obtain the first steam flow rate and the second steam flow rate.
[0084] Step S504: When the steam output temperature and the steam input temperature satisfy a first preset relationship, and the first steam flow rate and the second steam flow rate satisfy a second preset relationship, the first opening of the steam storage container is closed, and the steam in the second heater and the third heater is sent to the condenser.
[0085] The first preset relationship is used to represent an ideal temperature relationship between the steam output temperature and the steam input temperature. Exemplarily, the first preset relationship means that the temperature difference between the steam output temperature and the steam input temperature is within a preset temperature range, and the preset temperature range is an empirical value.
[0086] The second preset relationship is used to represent an ideal flow relationship between the first steam flow rate and the second steam flow rate. Exemplarily, the second preset relationship means that the flow difference between the first steam flow rate and the second steam flow rate is less than a preset flow value, and the preset flow value is an empirical value.
[0087] In some embodiments, the first opening of the steam storage container is closed, and the steam in the second heater and the third heater is sent to the condenser, so that the drain recycling system of the waste power plant returns to the initial state.
[0088] To sum up, by adopting the above technical scheme, after cleaning the steam preheater, the steam flow rate entering the steam preheater is reduced, and the steam output temperature and steam flow rate are detected in real time until the steam output temperature and steam flow rate are qualified, and then the steam preheater is allowed to work normally.
[0089] 2. The steam output temperature is lower than the minimum temperature warning value.
[0090] If the steam output temperature is less than the minimum temperature warning value, it means that the heat exchange efficiency of the steam preheater is too high, the steam flow rate inside the steam preheater is too fast, and the steam entering the steam preheater needs to be reduced. To this end, the present application embodiment provides a method for using a steam preheater, which includes steps S601 to S604, and the specific contents include: Step S601: when it is detected that the steam output temperature is less than the minimum temperature warning value, the first steam flow rate and the steam input temperature entering the steam preheater are obtained.
[0091] Optionally, a flow sensor is provided at the first opening of the steam storage container, and the flow sensor is used to obtain the first steam flow rate.
[0092] Optionally, a temperature sensor is provided at the first opening of the steam storage container, and the temperature sensor is used to obtain the steam input temperature.
[0093] Step S602: predicting the future temperature of the steam preheater within a preset time period according to the first steam flow rate, the steam output temperature and the steam input temperature.
[0094] In some embodiments, the temperature prediction model is called to process the first steam flow rate and the steam input temperature to obtain the future temperature of the steam preheater within a preset period of time. The temperature prediction model can use any one of a feedforward neural network, a recurrent neural network, a convolutional neural network, and a deep neural network.
[0095] Step S603: If the future temperature within the preset time period is always lower than the minimum temperature warning value, the first opening and the second opening of the steam storage container are opened.
[0096] If the future temperature within the preset time period is always lower than the minimum temperature warning value, it indicates that the steam flow rate entering the steam preheater is too fast. In this embodiment of the present application, part of the steam is diverted by opening the first opening and the second opening of the steam storage container.
[0097] Step S604: Control the steam to enter from the first opening of the steam storage container, and control the steam to leave from the second opening of the steam storage container.
[0098] In some embodiments, the first air pump may be turned on to control the steam to enter from the first opening of the steam storage container, and the steam may be controlled to leave from the second opening of the steam storage container.
[0099] In some embodiments, since the second opening is connected to the condenser, an embodiment of the present application provides a method for using a steam preheater, the method comprising steps S701 to S704, and the specific contents include: Step S701: obtaining the condensed steam pressure at the steam inlet of the condenser.
[0100] In some embodiments, a pressure sensor is provided at the steam inlet of the condenser, and the pressure sensor is used to obtain the condensed gas pressure.
[0101] Step S702: When the condensed gas pressure is greater than the upper limit of the gas pressure, the first flow rate and the second flow rate of the steam are calculated according to the condensed gas pressure and the upper limit of the gas pressure.
[0102] In some embodiments, the flow prediction model is called to process the condensed gas pressure and the gas pressure upper limit to obtain the first flow and the second flow. The flow prediction model can use any one of a feedforward neural network, a recurrent neural network, a convolutional neural network, and a deep neural network.
[0103] Step S703: sending the steam output from the drain expansion tank into the condenser at a first flow rate.
[0104] In some embodiments, a valve is provided at the steam inlet of the condenser, and the valve can adjust the flow rate entering the first heater.
[0105] Step S704: sending the steam output from the hydrophobic expansion tank to the first heater at a second flow rate.
[0106] In some embodiments, a valve is provided at the steam inlet of the first heater, and the valve can adjust the flow rate entering the first heater.
[0107] In summary, by adopting the above technical solution, the amount of steam entering the steam preheater can be reduced, and the temperature of the steam preheater can be prevented from being too high, which affects the normal operation of the steam preheater.
[0108] Step S302: close the exhaust port of the steam preheater.
[0109] Optionally, a valve is provided at the exhaust port of the steam preheater, and the valve can control the opening and closing of the exhaust port of the steam preheater.
[0110] In summary, by adopting the above technical solution, the steam in the second heater and the third heater can be sent to the hydrophobic expansion tank, and the function of the steam preheater can be temporarily shut down to facilitate the inspection of the technicians. The steam storage container can be used to hold the steam, and the excess hydrophobicity or sediment in the steam preheater can be cleared with high-pressure steam to ensure the normal operation of the steam preheater. The amount of steam entering the steam preheater can also be reduced to prevent the temperature of the steam preheater from being too high, which affects the normal operation of the steam preheater.
[0111] In the following embodiments, due to the limited structural strength of the condenser, it is necessary to note that the gas pressure of the condenser cannot exceed the maximum gas pressure allowed by the condenser. To solve this problem, Figure 8 A schematic flow chart of a method for using a steam storage container provided in an embodiment of the present application is shown, the method comprising: Step S801: when it is detected that the condensed gas pressure at the steam inlet of the condenser is greater than the maximum gas pressure, the first opening and the second opening of the steam storage container are opened.
[0112] In some embodiments, the maximum gas pressure is less than the maximum gas pressure that the condenser is allowed to withstand. For example, if the maximum gas pressure that the condenser can withstand is 20 kPa, the maximum gas pressure can be set to 18 kPa.
[0113] Step S802: Control the steam to enter from the second opening of the steam storage container and leave from the first opening of the steam storage container.
[0114] In some embodiments, a second air pump is disposed at the second opening of the steam storage container, and the second air pump can deliver the steam output by the steam turbine into the steam storage container.
[0115] In summary, by adopting the above technical solution, the steam storage container can relieve the steam pressure on one side of the condenser, thereby preventing the condenser from being damaged by excessive steam pressure.
[0116] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.
[0117] An embodiment of the present application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed by a method for recycling drainage in a waste power plant.
[0118] Computer storage media include, for example, various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.
[0119] Based on the same inventive concept, an embodiment of the present application provides an intelligent terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute a drainage recycling method for a waste power plant.
[0120] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.
[0121] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.
Claims
1. A hydrophobic recycling system, characterized in that: include: Boiler, steam turbine, steam preheater, steam expansion tank, condenser, first heater, deaerator; The boiler is connected to the steam turbine, the boiler is used to provide steam to the steam turbine, the steam turbine is connected to the steam preheater, the steam preheater is connected to the steam trap expansion tank, the steam preheater is used to exchange heat between steam and air entering the boiler, and the steam trap expansion tank includes a water outlet and a steam exhaust port; The water outlet of the hydrophobic expansion tank is communicated with the deaerator; The steam outlet of the drain expansion tank is in communication with the first heater, the first heater, the condenser and the deaerator are sequentially connected along a pipeline, the condenser is used to condense steam into drain, the heat generated by the condenser is used to exchange heat with the air entering the boiler, and the first heater is used to exchange heat between the steam output from the drain expansion tank and the drain generated by the condenser; The deaerator is connected to the boiler, and is used for providing drainage to the boiler.
2. The system according to claim 1, characterized in that The first opening of the steam storage container is arranged at the steam inlet of the steam preheater, the second opening of the steam storage container is arranged at the steam inlet of the condenser, a control valve is arranged on the pipeline between the steam turbine and the steam preheater, the steam in the steam storage container flows from the first opening to the second opening, or the steam in the steam storage container flows from the second opening to the first opening.
3. The system according to claim 2, characterized in that A steam inlet of a second heater is connected to the steam turbine, a steam outlet of the second heater is connected to the condenser, and the second heater is used to exchange heat between the drain output by the drain expansion tank and the steam output by the steam turbine. A steam inlet of a third heater is connected to the steam turbine, a steam outlet of the third heater is connected to the condenser, and the third heater is used to exchange heat between the drain generated by the condenser and the steam output by the steam turbine.
4. A method for recycling hydrophobic water, characterized in that: Applied to the drain recycling system as claimed in claim 3, the method comprises: In response to a startup operation, the steam output from the steam turbine is fed into a steam preheater, and the steam output from the steam preheater is fed into the drain expansion tank; When it is detected that the internal pressure of the drain expansion tank meets the starting pressure, the drain output from the drain expansion tank is sent to the deaerator, and the steam output from the drain expansion tank is sent to the condenser; When the amount of drainage in the deaerator reaches a preset amount of drainage, the drainage in the deaerator is sent to the boiler.
5. The method for recovering water according to claim 4, characterized in that: The method further comprises: When it is detected that the steam output temperature of the steam preheater does not match the preset temperature, the steam in the second heater and the third heater is sent to the drain expansion tank; Close the exhaust port of the steam preheater.
6. The hydrophobic recovery method according to claim 5, characterized in that: The method further comprises: When it is detected that the steam output temperature is greater than the maximum temperature warning value, the steam output by the steam turbine is sent to a steam storage container; When the internal pressure of the steam storage container is greater than the preset pressure, the control valve is closed and the exhaust port of the steam preheater is opened; The steam storage container is controlled to release high-pressure steam to the steam preheater through a steam inlet.
7. The hydrophobic recovery method according to claim 6, characterized in that: The method further comprises: Opening the exhaust port of the steam preheater and the control valve; Controlling the first opening of the steam storage container to be continuously opened so as to reduce the amount of steam entering the steam preheater; obtaining a steam input temperature, a first steam flow rate entering the steam storage container, and a second steam flow rate leaving the steam storage container; When the steam output temperature and the steam input temperature satisfy a first preset relationship, and the first steam flow rate and the second steam flow rate satisfy a second preset relationship, the first opening of the steam storage container is closed, and the steam in the second heater and the third heater is sent to the condenser.
8. The hydrophobic recovery method according to claim 5, characterized in that: The method further comprises: When it is detected that the condensed gas pressure at the steam inlet of the condenser is greater than the maximum gas pressure, opening the first opening and the second opening of the steam storage container; The steam is controlled to enter from the second opening of the steam storage container and to leave from the first opening of the steam storage container.
9. The hydrophobic recovery method according to claim 5, characterized in that: The method further comprises: When it is detected that the steam output temperature is less than a minimum temperature warning value, obtaining a first steam flow rate and a steam input temperature entering the steam preheater; predicting a future temperature of the steam preheater within a preset time period according to the first steam flow rate, the steam output temperature, and the steam input temperature; If the future temperature within the preset time period is always lower than the minimum temperature warning value, opening the first opening and the second opening of the steam storage container; The steam is controlled to enter from the first opening of the steam storage container, and the steam is controlled to leave from the second opening of the steam storage container.
10. The hydrophobic recovery method according to claim 9, characterized in that: The method further comprises: obtaining the condensed gas pressure at the steam inlet of the condenser; When the condensed gas pressure is greater than the upper limit of the gas pressure, calculating the first flow rate and the second flow rate of steam according to the condensed gas pressure and the upper limit of the gas pressure; delivering the steam outputted from the drain expansion tank into the condenser at the first flow rate; The steam output from the drain expansion tank is sent to the first heater at the second flow rate.