Boiler regular drainage sewage heat energy recovery system and method

Abstract

The invention discloses a boiler regular drainage sewage heat energy recovery system, the system comprises a cold end system and a hot end system, the cold end system comprises: a pressurization device for pressurizing water flow in the system; the heat exchange equipment is connected to the pressurizing equipment and is used for recovering heat energy of the sewage water and carrying out heat exchange; the butt joint port is communicated with the heat exchange equipment and is used for transferring heat of fluid; the cold and hot end system comprises a boiler barrel sewage discharging system connected to the heat exchange equipment and used for providing a heat source; the water tank is connected to an outlet of the heat exchange equipment and used for storing the cooling water subjected to heat exchange; pressurizing the dewatering treatment equipment through a water pump; by comprehensively utilizing heat energy in sewage and optimizing water resource management, the energy utilization efficiency, the operation stability and the environmental protection property of the boiler are effectively improved, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to a boiler fixed-discharge sewage heat energy recovery system and method. Background Art

[0002] With the continuous advancement of industrialization, boilers, as energy-intensive equipment, are widely used in the fields of electricity, chemical industry, metallurgy, etc., and have become key equipment in many industrial production processes. In long-term operation, boilers generate heat energy by burning fuel to supply heat sources such as steam or hot water. However, in the normal operation of the boiler, regular discharge of wastewater is inevitable. Boiler wastewater usually contains a certain amount of heat energy, especially during the operation of the boiler, due to water quality regulation, boiler water circulation and other reasons, the temperature of the wastewater is often high.

[0003] At present, the treatment and discharge of boiler wastewater mainly relies on directly discharging it into the external environment or discharging it after simple cooling. This treatment method has the following major technical problems:

[0004] The temperature of boiler wastewater is generally not low and still contains a certain amount of heat energy. If the discharged wastewater is not effectively recovered, direct discharge will cause a huge waste of heat energy, resulting in low overall thermal efficiency of the boiler, increased energy consumption and reduced energy utilization.

[0005] In traditional boiler systems, the wastewater discharged during boiler operation is not effectively recovered for heat energy, resulting in part of the heat energy not being utilized and the thermal efficiency of the boiler not being maximized. This waste of heat energy not only increases the demand for fuel, but also increases the environmental burden.

[0006] After heat exchange, boiler wastewater usually needs to be treated through a cooling water system. Untreated or simply cooled cooling water may contain dirt, impurities, etc., and direct discharge will pollute the environment. In addition, the waste of cooling water will also increase the operating cost of the cooling system.

[0007] In some boiler systems, the wastewater is not pressurized and effectively heat exchanged, which may lead to fluid instability, affecting the heat exchange effect and system operation efficiency. At the same time, the lack of effective control measures in the design and operation management of the system may lead to problems such as unstable operation of the boiler system and poor energy saving effect.

[0008] Therefore, the traditional boiler system has significant deficiencies in heat recovery and cooling water treatment, and cannot fully utilize the heat energy in the wastewater, resulting in a waste of energy resources and increasing the burden on the environment. With the increasing requirements for energy efficiency and environmental protection, traditional boiler wastewater treatment and heat recovery technologies are in urgent need of improvement and innovation. How to efficiently recover the heat energy in boiler wastewater, improve the thermal efficiency of the boiler system, reduce energy waste, and effectively treat and reuse cooling water has become a technical problem that needs to be solved in the current boiler technology. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a boiler wastewater heat energy recovery system and method, which recovers the heat energy of boiler wastewater and effectively utilizes and treats cooling water, thereby improving the thermal energy utilization efficiency, reducing energy consumption, reducing environmental pollution, and ensuring efficient and safe operation of the system.

[0010] The technical solution adopted by the present invention to solve its technical problem is:

[0011] A boiler wastewater heat recovery system, the system comprising a cold end system and a hot end system, the cold end system comprising:

[0012] Pressurizing equipment, used to pressurize the cold-end fluid inside the system;

[0013] A heat exchange device, connected to the pressurizing device, for recovering heat energy from the sewage and performing heat exchange;

[0014] A docking port in communication with the heat exchange device, used for heat transfer of the fluid;

[0015] The hot end system comprises:

[0016] A boiler drum sewage system is connected to the heat exchange equipment and is used to provide a heat source;

[0017] A water tank connected to the heat exchange device and used to store cooling water after heat exchange;

[0018] The water treatment equipment is connected to the water tank and is used for treating cooling water.

[0019] Preferably, the hot end system also includes:

[0020] A regular sewage expansion tank is connected to the boiler drum sewage system, and the sewage discharged by the regular sewage expansion tank is re-leaded out to the heat exchange equipment through a tee and a valve;

[0021] An exhaust steam cooler is connected to the periodic blowdown expansion tank and is used to recover the heat of the exhaust steam of the periodic blowdown expansion tank of the boiler;

[0022] Desalted water cooling water supply system and desalted water cooling recovery system are used to cool and recover heat in the exhaust steam cooler;

[0023] The sewage cooling pool is connected to the periodic sewage expansion tank and is used to discharge the treated sewage.

[0024] Preferably, the pressurizing device is a water pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a deaerator.

[0025] Preferably, the pressurizing device is a blower, the heat exchange device is a fin heat exchanger, and the docking port is an inlet or outlet of a boiler fan.

[0026] Preferably, the pressurizing device is an ammonia solution pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a boiler ammonia injection pipeline.

[0027] Preferably, the system further comprises a DCS automatic control system for monitoring and adjusting the operating status of each device, and the DCS automatic control system comprises:

[0028] The sensor module is used to collect real-time data of key parameters in the system, including temperature, pressure, and flow;

[0029] A control unit, which is used to receive real-time data from the sensor module and automatically adjust the device according to the preset control logic;

[0030] An execution module is used to execute control instructions from the control unit and adjust the operating parameters of the pressurizing equipment, the heat exchange equipment and the water treatment equipment;

[0031] Human-machine interface, used to display the system's operating status, alarm information, and control settings, and provide a manual intervention operation interface;

[0032] The communication module is used to realize data transmission and real-time information interaction between various devices in the DCS control system.

[0033] Another technical problem to be solved by the present invention is to provide a method for recovering heat energy from boiler wastewater, comprising the following steps:

[0034] Re-plumb the line entering the periodic blowdown expansion tank by adding a tee and valve and convey the blowdown water to the heat exchange equipment;

[0035] In the heat exchange equipment, the heat exchange medium is used to exchange heat with the sewage, recover the heat energy in the sewage, increase the temperature of the cold source and supply it to the corresponding system of the boiler;

[0036] The wastewater after heat exchange is transported to the water tank and treated by water treatment equipment;

[0037] The treated cooling water is stored in a water tank and the water temperature is further reduced through a water cooling system;

[0038] Use the DCS automatic control system to monitor the system operation status in real time and adjust the working parameters of the pressurizing equipment, heat exchange equipment and water treatment equipment;

[0039] The waste heat in the exhaust steam of the boiler expansion tank is recovered through the exhaust steam cooler and linked with the water cooling system.

[0040] Another technical problem to be solved by the present invention is to provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for recovering heat energy from a boiler wastewater discharge as described in any one of the above is implemented.

[0041] Another technical problem to be solved by the present invention is to provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, a method for recovering heat energy from boiler wastewater as described in any of the above is implemented.

[0042] The beneficial effects of the present invention are:

[0043] The system recovers the heat energy in the sewage by introducing the cold-end system and the hot-end system to reduce energy waste. The heat in the sewage is transferred to the cooling water through the heat exchange equipment to improve the overall thermal energy utilization efficiency; by recovering the heat energy of the sewage and optimizing the reuse of heat, it not only reduces the heat energy loss, but also improves the overall thermal efficiency of the boiler system, thereby reducing energy consumption.

[0044] The system is designed with dewatering equipment specifically for treating cooling water after heat exchange, ensuring that the reuse or discharge of cooling water complies with environmental protection standards and improves the sustainability of the system; the system uses pressurizing equipment, heat exchange equipment and efficient water treatment equipment to achieve stable pressurization and efficient heat exchange of the fluid, ensuring that the entire system can operate efficiently and stably under different working conditions and avoid negative effects caused by heat recovery; by recovering the heat energy in the boiler's fixed discharge wastewater and effectively treating the cooling water, it can not only reduce the negative impact on the environment, but also achieve energy recycling, reduce the system's dependence on external energy, and reduce overall energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the waste heat utilization process of the boiler wastewater heat recovery system. Specific implementation methods

[0047] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described more specifically by way of example in the following paragraphs. According to the following description and claims, the advantages and features of the present invention will become clearer.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. Example

[0049] See also Figure 1 As shown, a boiler fixed discharge wastewater heat energy recovery system, the system includes a cold end system and a hot end system, the cold end system includes:

[0050] Pressurizing equipment, used to pressurize the cold-end fluid inside the system;

[0051] A heat exchange device, connected to the pressurizing device, for recovering heat energy from the sewage and performing heat exchange;

[0052] A docking port in communication with the heat exchange device, used for heat transfer of the fluid;

[0053] The hot end system comprises:

[0054] A boiler drum sewage system is connected to the heat exchange equipment and is used to provide a heat source;

[0055] A water tank connected to the heat exchange device and used to store cooling water after heat exchange;

[0056] The water treatment equipment is connected to the water tank and is used for treating cooling water.

[0057] The heat exchange equipment can effectively transfer the heat energy in the wastewater discharged by the boiler to the cooling water system by recovering the heat energy in the wastewater and performing heat exchange, thus avoiding a large amount of heat energy waste. Through this process, the system can maximize the overall thermal efficiency of the boiler, reduce dependence on external energy (such as fuel), and thus reduce operating costs; after the heat energy in the wastewater is recovered and utilized, the thermal efficiency of the boiler is improved, which can improve the operating efficiency and energy saving effect of the boiler.

[0058] Recycling and reusing the heat energy in wastewater can reduce the need for additional fuel, thereby reducing energy consumption. Especially under high temperature and high pressure conditions, the heat energy in wastewater is relatively high, and recycling it can significantly improve the overall energy efficiency of the system; because the heat energy is recovered, the amount of additional fuel required for the boiler is reduced, which directly reduces the cost of fuel procurement and consumption.

[0059] By recycling and treating wastewater, not only the efficiency of heat recovery is improved, but also the waste of cooling water and other water resources can be reduced. The cooling water stored in the water tank after heat exchange can be reused, further reducing the demand for external water sources; the dewatering equipment helps to treat the quality of the discharged water, ensuring that the wastewater meets environmental protection standards before being discharged into the environment, reducing water pollution and negative impacts on the environment.

[0060] Pressurization equipment can stabilize the flow and temperature of the fluid and ensure the efficient operation of the heat exchange equipment. By pressurizing, it is possible to avoid the situation where the heat recovery efficiency is affected by unstable system pressure or poor fluid flow; the effective coordination of the cold end and hot end systems ensures the smooth recovery and transfer of the heat energy of the boiler wastewater, thereby improving the overall stability and safety of the system.

[0061] The dewatering equipment can treat the cooling water, remove impurities, sediments and corrosion factors in the water, and prevent these impurities from entering the boiler and heat exchange equipment, thereby reducing the risk of system corrosion and scaling and extending the service life of the boiler and related equipment; by recovering the heat energy in the wastewater, the energy and water treatment costs in the operation of the boiler can be significantly reduced, and the overall economic benefits of the system can be improved; through wastewater treatment and environmental protection measures, the pollutants discharged can be reduced, and fines or additional treatment costs caused by non-compliance with emission standards can be avoided.

[0062] The system can intelligently adjust the operating status of the pressurizing equipment and heat exchange equipment according to the actual operating conditions of the boiler, maximize the heat recovery efficiency, and achieve dynamic optimization and automatic adjustment of the system. This intelligent control not only improves the thermal efficiency of the system, but also further reduces the cost of manual management and maintenance.

[0063] The hot end system also includes:

[0064] A regular sewage expansion tank is connected to the boiler drum sewage system, and the sewage discharged by the regular sewage expansion tank is re-leaded out to the heat exchange equipment through a tee and a valve;

[0065] An exhaust steam cooler is connected to the periodic blowdown expansion tank and is used to recover the heat of the exhaust steam of the periodic blowdown expansion tank of the boiler;

[0066] Desalted water cooling water supply system and desalted water cooling recovery system are used to cool and recover heat in the exhaust steam cooler;

[0067] The sewage cooling pool is connected to the periodic sewage expansion tank and is used to discharge the treated sewage.

[0068] By setting up an exhaust steam cooler, the exhaust steam heat in the boiler periodic blowdown expansion tank can be effectively recovered. The exhaust steam cooler uses the hot gas generated during the boiler blowdown process for heat exchange and transfers the heat to cooling water or other media, which not only improves the efficiency of heat recovery, but also further reduces the energy consumption of the boiler and improves the overall thermal efficiency of the system; the system realizes multi-level heat recovery from waste water to exhaust steam, effectively utilizes the heat energy generated during the boiler blowdown process, and reduces energy waste.

[0069] The desalted water cooling system is used to cool and recover the heat in the exhaust steam cooler, which can further improve the efficiency of water resource utilization. By recovering the heat of cooling water, the demand for external cooling water is reduced, and the pressure on water treatment facilities is also reduced; the sewage cooling pool can effectively treat the discharged high-temperature sewage, ensuring that the discharged water temperature meets environmental protection standards, thereby reducing the waste of water resources and helping to avoid water pollution or ecological problems caused by the discharge of overheated water.

[0070] Recovering heat through the exhaust steam cooler and desalted water cooling and recovery system can reduce the boiler's demand for fuel and energy consumption. At the same time, the recovered heat can also reduce the use of cooling water, thereby reducing the cost of water treatment and water procurement; after the sewage is treated in the sewage cooling pool, the water temperature can be reduced and potential pollutants can be removed, ensuring that the discharge complies with environmental regulations and reduces environmental pollution and related governance costs. By optimizing heat recovery and sewage treatment, the overall environmental performance has been improved

[0071] The pressurizing device is a water pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a deaerator.

[0072] Shell and tube heat exchanger is a common and efficient heat exchange equipment with a large heat exchange area and good heat exchange performance. Using shell and tube heat exchanger in the system can maximize the heat exchange efficiency and quickly transfer heat from hot medium (such as steam or hot water) to cooling medium (such as cold water or demineralized water). This helps the system respond quickly to load changes and improve energy efficiency; by rationally designing the structure and fluid distribution of the shell and tube heat exchanger, the heat exchange capacity of the heat exchanger can be improved, heat loss can be reduced, and the heat recovery efficiency can be improved, thereby saving energy.

[0073] As a pressurizing device, the water pump can ensure the stability of water flow and water pressure in the system, and ensure the flow of cooling water or heat exchange medium. The water pump can effectively maintain the system pressure, prevent water flow interruption or insufficient heat exchange due to insufficient pressure, and ensure the stable operation of the entire system; the deaerator is used to remove dissolved oxygen in the water to prevent oxygen corrosion. Dissolved oxygen has a corrosive effect on pipes, boilers and other equipment in the system, reducing equipment life and system reliability. Using a deaerator can extend the service life of the system, reduce maintenance costs, and improve the long-term reliability of the system.

[0074] The use of water pumps and shell and tube heat exchangers can achieve more efficient heat transfer and water circulation, thereby improving the overall energy efficiency of the system. The water pump ensures the effective flow of cooling or heat exchange media, while the shell and tube heat exchanger reduces heat loss through efficient heat exchange; after the deaerator removes dissolved oxygen in the water, it can reduce the occurrence of oxygen corrosion in the water, avoid equipment failure or damage caused by oxygen corrosion, and indirectly reduce equipment maintenance, replacement and energy loss, thereby achieving energy saving effects.

[0075] The pressurizing device is a blower, the heat exchange device is a fin heat exchanger, and the docking port is an inlet or outlet of a boiler blower.

[0076] Fin heat exchangers can achieve efficient heat exchange in a relatively compact space due to their large heat exchange surface area. Their design optimizes the heat transfer process by increasing the heat exchange surface, and is particularly suitable for heat exchange between air and gas. In this solution, the fin heat exchanger can effectively utilize the waste heat at the inlet or outlet of the boiler fan and transfer the heat to the medium that needs to be heated or cooled, thereby improving the overall thermal energy utilization efficiency of the system; the blower, as a pressurizing device, can effectively increase the gas flow rate, promote air flow, and ensure that heat is fully transferred in the fin heat exchanger. By increasing the air flow rate, the blower can improve the uniformity and heat exchange efficiency of the airflow, reduce heat loss, and thus improve the energy utilization of the system.

[0077] By connecting the blower to the inlet or outlet of the boiler fan, the air flow and gas distribution inside the boiler can be optimized. The role of the blower is to increase the pressure of the air flow so that the air can enter the boiler more evenly, thereby improving the combustion efficiency and the stability of the gas flow. This helps to improve the working efficiency of the boiler and reduce fuel waste; the airflow optimization of the blower can also ensure that the airflow distribution of the fin heat exchanger is uniform, improving the working efficiency of the heat exchanger. The optimization of airflow speed and distribution makes the heat exchange process more efficient and reduces the decrease in heat exchange efficiency caused by uneven or poor airflow.

[0078] By combining the blower and the fin heat exchanger, the system is able to recover part of the waste heat at the inlet or outlet of the boiler fan. This part of the heat energy is transferred to other areas where it is needed, such as air heating or water heating, thereby reducing the boiler's dependence on external energy and achieving the purpose of energy saving. The recovery of heat energy not only improves the overall energy utilization rate, but also effectively reduces energy consumption and operating costs; the design of the system helps to reduce heat energy waste and improve boiler efficiency, thereby reducing pollutant emissions (such as carbon dioxide and nitrogen oxides), helping to improve the environmental performance of the system and meet the requirements of modern energy conservation and emission reduction.

[0079] The pressurizing device is an ammonia solution pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a boiler ammonia injection pipeline.

[0080] The ammonia solution pump provides a stable ammonia solution flow rate by pressurizing, ensuring that ammonia can be evenly sprayed into the boiler denitration system. Stable and accurate ammonia solution supply helps improve the effect of the denitration reaction, ensuring that ammonia and NOx react fully during the denitration process to achieve higher denitration efficiency; the shell and tube heat exchanger can provide effective heat transfer, helping the ammonia solution to fully utilize the waste heat generated by the boiler before entering the boiler denitration ammonia injection pipeline. By optimizing the temperature of the ammonia solution, its reaction activity can be increased, further improving the efficiency of the denitration process.

[0081] Through the shell and tube heat exchanger, the waste heat generated by the boiler can be used to preheat the ammonia solution, which reduces the demand for external energy. After the preheated ammonia solution enters the ammonia injection pipeline, it can participate in the denitration reaction more effectively, increase the reaction rate and reduce energy consumption; through pressurization, the ammonia solution can enter the ammonia injection system at a higher pressure and flow rate, which helps to improve the injection effect of ammonia and make the ammonia more evenly distributed inside the boiler, thereby optimizing the reaction effect, reducing the consumption of ammonia solution, and achieving energy saving.

[0082] The system can effectively reduce nitrogen oxide (NOx) emissions during boiler combustion by improving denitrification efficiency. This meets the requirements of modern environmental protection policies, helps reduce air pollution, and reduces the impact on the environment; stable ammonia solution pump pressurization and shell and tube heat exchanger optimization can control the amount of ammonia solution used, avoiding the problem of excessive use of ammonia solution, thereby reducing potential harm to the environment and avoiding adverse situations such as ammonia escape.

[0083] The system also includes a DCS automatic control system for monitoring and adjusting the operating status of each device. The DCS automatic control system includes:

[0084] The sensor module is used to collect real-time data of key parameters in the system, including temperature, pressure, and flow;

[0085] A control unit, which is used to receive real-time data from the sensor module and automatically adjust the device according to the preset control logic;

[0086] An execution module is used to execute control instructions from the control unit and adjust the operating parameters of the pressurizing equipment, the heat exchange equipment and the water treatment equipment;

[0087] Human-machine interface, used to display the system's operating status, alarm information, and control settings, and provide a manual intervention operation interface;

[0088] The communication module is used to realize data transmission and real-time information interaction between various devices in the DCS control system.

[0089] The sensor module collects key parameters (such as temperature, pressure, flow, etc.) in real time and can continuously monitor the system operation status. This enables the system to detect abnormal conditions in a timely manner, such as excessive temperature, low pressure, etc., to avoid equipment overload or unstable operation, and ensure long-term stable operation of the equipment; through accurate real-time data collection, it can comprehensively monitor all links in the system, improve the transparency of the operation of the entire denitrification or pressurization system, and reduce the risk of equipment damage and failure.

[0090] The control unit receives real-time data from the sensor module and automatically adjusts the operating parameters of the equipment (such as ammonia solution pumps, heat exchangers, etc.) according to the preset control logic. This enables the entire system to operate automatically under different working conditions without manual intervention, ensuring the accuracy and stability of system operation; automatic control can not only operate under set conditions, but also make timely adjustments when working conditions change, ensuring that the equipment is always in the best operating state and avoiding the instability caused by manual adjustment.

[0091] The execution module adjusts the operating parameters of the pressurizing equipment, heat exchange equipment and water treatment equipment according to the instructions of the control unit. This module can respond to control instructions in real time, ensure rapid adjustment of equipment through precise execution, and enhance the flexibility and adaptability of the system; when load fluctuations or equipment abnormalities occur, the execution module can make adjustments immediately to quickly restore normal operation and improve the system's adaptability and fault recovery capabilities.

[0092] A method for recovering heat energy from boiler wastewater, comprising the following steps:

[0093] Re-plumb the line entering the periodic blowdown expansion tank by adding a tee and valve and convey the blowdown water to the heat exchange equipment;

[0094] In the heat exchange equipment, the heat exchange medium is used to exchange heat with the sewage, recover the heat energy in the sewage, increase the temperature of the cold source and supply it to the corresponding system of the boiler;

[0095] The wastewater after heat exchange is transported to the water tank and treated by water treatment equipment;

[0096] The treated cooling water is stored in a water tank and the water temperature is further reduced through a water cooling system;

[0097] Use the DCS automatic control system to monitor the system operation status in real time and adjust the working parameters of the pressurizing equipment, heat exchange equipment and water treatment equipment;

[0098] The waste heat in the exhaust steam of the boiler expansion tank is recovered through the exhaust steam cooler and linked with the water cooling system.

[0099] This embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the boiler wastewater heat energy recovery method as described above when executing the program.

[0100] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method for recovering heat energy from fixed-discharge wastewater from a boiler as described above is implemented.

[0101] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0102] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above.

[0103] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A boiler wastewater heat recovery system, characterized in that: The system includes a cold end system and a hot end system, and the cold end system includes: Pressurizing equipment, used to pressurize the cold-end fluid inside the system; A heat exchange device, connected to the pressurizing device, for recovering heat energy from the sewage and performing heat exchange; A docking port in communication with the heat exchange device, used for heat transfer of the fluid; The hot end system comprises: A boiler drum sewage system is connected to the heat exchange equipment and is used to provide a heat source; A water tank connected to the heat exchange device and used to store cooling water after heat exchange; The water treatment equipment is connected to the water tank and is used for treating cooling water.

2. The boiler wastewater heat recovery system according to claim 1 is characterized in that: The hot end system also includes: A regular sewage expansion tank is connected to the boiler drum sewage system, and the sewage discharged by the regular sewage expansion tank is re-leaded out to the heat exchange equipment through a tee and a valve; An exhaust steam cooler is connected to the periodic blowdown expansion tank and is used to recover the heat of the exhaust steam of the periodic blowdown expansion tank of the boiler; Desalted water cooling water supply system and desalted water cooling recovery system are used to cool and recover heat in the exhaust steam cooler; The sewage cooling pool is connected to the periodic sewage expansion tank and is used to discharge the treated sewage.

3. The boiler wastewater heat recovery system according to claim 1 is characterized in that: The pressurizing device is a water pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a deaerator.

4. The boiler wastewater heat recovery system according to claim 1 is characterized in that: The pressurizing device is a blower, the heat exchange device is a fin heat exchanger, and the docking port is an inlet or outlet of a boiler blower.

5. The boiler wastewater heat recovery system according to claim 1 is characterized in that: The pressurizing device is an ammonia solution pump, the heat exchange device is a shell and tube heat exchanger, and the docking port is a boiler ammonia injection pipeline.

6. The boiler wastewater heat recovery system according to any one of claims 1 to 5, characterized in that: The system also includes a DCS automatic control system for monitoring and adjusting the operating status of each device. The DCS automatic control system includes: The sensor module is used to collect real-time data of key parameters in the system, including temperature, pressure, and flow; A control unit, which is used to receive real-time data from the sensor module and automatically adjust the device according to the preset control logic; An execution module is used to execute control instructions from the control unit and adjust the operating parameters of the pressurizing equipment, the heat exchange equipment and the water treatment equipment; Human-machine interface, used to display the system's operating status, alarm information, and control settings, and provide a manual intervention operation interface; The communication module is used to realize data transmission and real-time information interaction between various devices in the DCS control system.

7. A method for recovering heat energy from boiler wastewater, characterized in that: The following steps are involved: Re-plumb the line entering the periodic blowdown expansion tank by adding a tee and valve and convey the blowdown water to the heat exchange equipment; In the heat exchange equipment, the heat exchange medium is used to exchange heat with the sewage, recover the heat energy in the sewage, increase the temperature of the cold source and supply it to the corresponding system of the boiler; The wastewater after heat exchange is transported to the water tank and treated by water treatment equipment; The treated cooling water is stored in a water tank and the water temperature is further reduced through a water cooling system; Use the DCS automatic control system to monitor the system operation status in real time and adjust the working parameters of the pressurizing equipment, heat exchange equipment and water treatment equipment; The waste heat in the exhaust steam of the boiler expansion tank is recovered through the exhaust steam cooler and linked with the water cooling system.

8. An electronic device, characterized in that: It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for recovering heat energy from boiler wastewater as claimed in claim 7 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for recovering heat energy from boiler wastewater discharge as described in claim 7 is implemented.

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