An industrial boiler external steam condensate water recycling device

Abstract

The utility model relates to steam condensate water recycling technical field, concretely is a kind of industrial boiler outer steam condensate water recycling device, including condensate water collection system, multistage heat exchange system, intelligent control system and recycling system;Condensate water collection system includes condensate water collection pipeline, separator and primary storage tank;Multistage heat exchange system includes plate heat exchanger, shell-and-tube heat exchanger and waste heat recovery unit;Intelligent control system includes temperature sensor, pressure sensor, flow sensor and PLC controller;Recycling system includes frequency conversion pump, backwater pipeline and secondary storage tank, for the condensate water after processing is transported back to the boiler body feedwater system.The utility model is through condensate water collection system, multistage heat exchange system, intelligent control system and recycling system, ensure that when needed can anytime supply back to the boiler body's feedwater system use, realize the recycling of condensate water.

Description

Technical Field

[0001] This utility model relates to the field of steam condensate recovery technology, specifically a device for recovering and utilizing condensate from externally supplied steam in industrial boilers. Background Technology

[0002] Industrial boilers are large-scale steam generating devices used in industrial production. They heat water by burning fuel and convert it into high-temperature, high-pressure steam. Condensate is liquid water that condenses after the steam transfers heat; it is hot and of good quality. However, for a long time, due to technological limitations, cost considerations, or poor management, a considerable portion of condensate has not been fully recycled and utilized.

[0003] Traditional condensate recovery devices, such as systems consisting of condensate storage tanks, water pumps, and heat exchange pipes commonly found in existing technologies, have achieved condensate recovery and partial heat utilization to a certain extent. However, most condensate recovery systems suffer from low energy efficiency, mainly due to their poor compatibility with multiple heat sources, making it difficult to fully exploit and utilize the diverse and varied waste heat resources in industrial production.

[0004] Therefore, developing a condensate recovery and utilization system that can achieve higher energy utilization efficiency is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an industrial boiler external steam condensate recovery and utilization device, which is a condensate recovery and utilization system with higher energy utilization efficiency, thereby solving the problem of low energy utilization efficiency that is common in most existing condensate recovery systems.

[0006] To achieve the above objectives, this utility model provides an industrial boiler external steam condensate recovery and utilization device, including a condensate collection system, a multi-stage heat exchange system, an intelligent control system, and a recycling system. The condensate collection system includes a condensate collection pipeline, a separator, and a primary storage tank, used to collect and pre-treat condensate generated by external steam supplied to the boiler body. The multi-stage heat exchange system includes a plate heat exchanger, a shell-and-tube heat exchanger, and a waste heat recovery unit. The plate heat exchanger and the shell-and-tube heat exchanger are connected in series, and the waste heat recovery unit is connected in parallel between the plate heat exchanger and the shell-and-tube heat exchanger to maximize the recovery of heat energy from the condensate. The intelligent control system includes a temperature sensor, a pressure sensor, a flow sensor, and a PLC controller. The temperature sensor, pressure sensor, and flow sensor are respectively installed in the condensate collection pipeline, the inlet and outlet of the plate heat exchanger / shell-and-tube heat exchanger and the waste heat recovery unit, and in the primary storage tank, used to monitor the operating parameters of each system in real time. The recycling system includes a variable frequency pump, a return water pipeline, and a secondary storage tank, used to transport the treated condensate back to the boiler body feedwater system.

[0007] Optionally, the separator is equipped with a deoxygenation device and a filtration device. The deoxygenation device adopts a vacuum deoxygenation method, and the filtration device has a multi-layer filter structure.

[0008] Optionally, the plate heat exchanger uses stainless steel corrugated plates with a plate thickness of 0.5-0.8 mm and a plate spacing of 2.5-3.5 mm.

[0009] Optionally, the waste heat recovery unit is provided with a spiral tube bundle, which is made of copper tube with a diameter of 25-32mm.

[0010] Optionally, the PLC controller is connected to a touch screen operating interface, which displays the system operating status, temperature curve, and energy consumption data.

[0011] Optionally, the variable frequency pump is a centrifugal pump with a power of 7.5-15kW and a flow rate of 20-50m³ / h.

[0012] Optionally, the return water pipeline is equipped with a check valve, a regulating valve, and a safety valve. The check valve is used to prevent backflow, the regulating valve is used to control the flow rate, and the safety valve is used to protect the system safety.

[0013] Optionally, the secondary storage tank has a volume of 5-20 m³ and is equipped with a level gauge and an overflow device.

[0014] Optionally, the condensate collection pipeline is an insulated pipe with an insulation layer thickness of 50-80mm.

[0015] Optionally, the multi-stage heat exchange system also includes a cooling tower for auxiliary cooling during high summer temperatures.

[0016] Compared with the prior art, this utility model provides a device for recovering and utilizing condensate from externally supplied steam in industrial boilers, which has the following beneficial effects: This utility model ensures that the condensate can be supplied back to the boiler body's feedwater system whenever needed through a condensate collection system, a multi-stage heat exchange system, an intelligent control system, and a recycling system, thus realizing the recycling of condensate. This invention sets the volume of the secondary storage tank to 5-20m³ to ensure that the capacity of the secondary storage tank meets the system's condensate recovery and storage requirements, while effectively preventing overflow and ensuring operational safety. This invention uses a cooling tower to ensure stable operation of the system in high-temperature environments and improves overall heat recovery efficiency. Attached Figure Description

[0017] Figure 1 The schematic diagram of the present invention is shown.

[0018] In the diagram: 1. Condensate collection pipeline; 2. Separator; 3. Primary storage tank; 4. Plate heat exchanger; 5. Shell-and-tube heat exchanger; 6. Waste heat recovery unit; 7. Temperature sensor; 8. Pressure sensor; 9. Flow sensor; 10. PLC controller; 11. Variable frequency pump; 12. Return water pipeline; 13. Secondary storage tank; 14. Deaerator; 15. Filter device; 16. Touch screen; 17. Check valve; 18. Regulating valve; 19. Safety valve; 20. Level gauge; 21. Overflow device; 22. Cooling tower; 23. Boiler body. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Please refer to Figure 1According to an embodiment of this utility model, a technical solution is provided: an industrial boiler external steam condensate recovery and utilization device, including a condensate collection system, a multi-stage heat exchange system, an intelligent control system, and a recycling system; the condensate collection system includes a condensate collection pipeline 1, a separator 2, and a primary storage tank 3, used to collect and pre-treat the condensate generated by the external steam supplied by the boiler body 23; the multi-stage heat exchange system includes a plate heat exchanger 4, a shell-and-tube heat exchanger 5, and a waste heat recovery unit 6, wherein the plate heat exchanger 4 and the shell-and-tube heat exchanger 5 are connected in series, and the waste heat recovery unit 6 is connected in parallel between the plate heat exchanger 4 and the shell-and-tube heat exchanger 5. Between the heat exchangers 5, the heat energy recovery in the condensate is maximized; the intelligent control system includes temperature sensor 7, pressure sensor 8, flow sensor 9 and PLC controller 10. Temperature sensor 7, pressure sensor 8 and flow sensor 9 are respectively installed in the inlet and outlet of condensate collection pipeline 1, plate heat exchanger 4, shell and tube heat exchanger 5 and waste heat recovery unit 6 and primary storage tank 3, for real-time monitoring of the operating parameters of each system; the recycling system includes frequency converter pump 11, return water pipeline 12 and secondary storage tank 13, for transporting the treated condensate back to the boiler body 23 feedwater system.

[0021] The industrial boiler external steam condensate recovery and utilization device with the above structure, after the condensate generated by the external steam of the boiler body 23 is collected by the condensate collection system, firstly, the impurities in the condensate are preliminarily filtered by the separator 2 to ensure that the water quality meets the recovery standards. Then, the condensate enters the primary storage tank 3 for storage, and after further treatment, it is sent to the multi-stage heat exchange system. In this process, the plate heat exchanger 4 and the shell and tube heat exchanger 5 are connected in series to maximize the recovery of heat energy in the condensate through heat exchange. The waste heat recovery unit 6 is set in parallel to ensure the maximum heat recovery effect while avoiding energy waste. The intelligent control system monitors the temperature, pressure and flow of each part in real time to ensure that the system parameters are in the best working state. If an abnormality occurs, the system will automatically adjust or alarm to ensure stable system operation. After the condensate temperature decreases after multi-stage heat exchange, it enters the recycling system. After being pressurized by the variable frequency pump 11, the condensate is transported to the secondary storage tank 13 through the return water pipeline 12 for secondary storage, ensuring that it can be supplied back to the feedwater system of the boiler body 23 when needed, realizing the recycling of condensate.

[0022] In this embodiment, the separator 2 is equipped with a deoxygenation device 14 and a filter device 15. The deoxygenation device 14 adopts a vacuum deoxygenation method, and the filter device 15 has a multi-layer filter structure. With this configuration, dissolved oxygen and solid impurities in the condensate can be effectively removed.

[0023] Specifically, the vacuum deaerator 14 effectively removes dissolved oxygen from the condensate by reducing the gas pressure, thereby preventing oxygen from corroding the internal metal components of the boiler system and extending the service life of the equipment. Simultaneously, the multi-layer filter 15 further filters out fine impurities in the condensate, ensuring its purity and preventing impurities from entering the heat exchange and recycling systems, thus avoiding system blockage and reduced heat exchange efficiency.

[0024] In this embodiment, the plate heat exchanger 4 uses stainless steel corrugated plates with a plate thickness of 0.5-0.8 mm and a plate spacing of 2.5-3.5 mm; this configuration can effectively improve the heat exchange efficiency of the heat exchanger.

[0025] Specifically, stainless steel corrugated plates have good corrosion resistance and thermal conductivity, and can maintain stability under long-term high temperature and high pressure environments, thus extending the service life of plate heat exchanger 4.

[0026] In this embodiment, the waste heat recovery unit 6 is equipped with a spiral tube bundle, which is made of copper tube with a diameter of 25-32mm; this configuration can effectively improve the heat exchange capacity of the waste heat recovery unit 6.

[0027] Specifically, copper tubes have high thermal conductivity, which can quickly transfer heat from the condensate to the heat exchange medium, improving heat recovery efficiency.

[0028] In this embodiment, the PLC controller 10 is connected to a touch screen 16 operating interface, which displays the system operating status, temperature curve and energy consumption data; this setting can improve the operability and real-time monitoring capability of the system.

[0029] Specifically, the PLC controller 10 connects to the touch screen 16 operating interface, allowing operators to intuitively view the system's operating status, temperature curve, and energy consumption data, facilitating real-time monitoring of the system's operation.

[0030] In this embodiment, the variable frequency pump 11 is a centrifugal pump with a power of 7.5-15kW and a flow rate of 20-50m³ / h; this setting can ensure the efficient delivery of condensate and the stable operation of the system.

[0031] Specifically, centrifugal pumps are widely used in various industrial systems due to their simple structure, stable operation, and convenient maintenance. Their design, with a power range of 7.5-15kW and a flow range of 20-50m³ / h, ensures that the pumps can provide sufficient flow and pressure under different working conditions to meet the needs of condensate recovery and circulation systems.

[0032] In this embodiment, the return water pipeline 12 is equipped with a check valve 17, a regulating valve 18, and a safety valve 19. The check valve 17 is used to prevent backflow, the regulating valve 18 is used to control the flow rate, and the safety valve 19 is used to protect the system safety. This arrangement can effectively ensure the stability and safety of the system.

[0033] Specifically, the check valve 17 prevents condensate from flowing back into the pipeline, avoiding potential damage or impact on system equipment from backflow, ensuring unidirectional water flow, preventing reverse flow, and protecting equipment from pressure fluctuations.

[0034] In this embodiment, the secondary storage tank 13 has a volume of 5-20 m³ and is equipped with a level gauge 20 and an overflow device 21. This configuration ensures that the capacity of the secondary storage tank 13 meets the system's condensate recovery and storage requirements, while effectively preventing overflow and ensuring operational safety.

[0035] Specifically, the volume of the secondary storage tank 13 is 5-20m³, which enables the system to store sufficient condensate and adjust it as needed to ensure that the storage capacity adapts to changes in condensate under different production loads.

[0036] In this embodiment, the condensate collection pipe 1 is an insulated pipe with an insulation layer thickness of 50-80mm; this setting can effectively reduce the heat loss of condensate during transportation and improve the energy utilization efficiency of the system.

[0037] Specifically, when condensate flows in the collection pipe, due to the temperature difference, if the pipe is not insulated, heat can easily be lost, affecting the condensate recovery effect.

[0038] In this embodiment, the multi-stage heat exchange system also includes a cooling tower 22 for auxiliary cooling during high summer temperatures; this configuration ensures that the system can still operate stably in high-temperature environments and improves the overall heat recovery efficiency.

[0039] Specifically, in summer, when the outside temperature is high, the temperature of the condensate may rise. Relying solely on a multi-stage heat exchange system for cooling may not meet the cooling requirements of the condensate. In this case, the addition of cooling tower 22 can assist in cooling through evaporative cooling, keeping the condensate within a suitable temperature range before entering the heat exchange system, thereby ensuring the high efficiency of the heat exchange process.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for recovering and utilizing condensate from externally supplied steam in an industrial boiler, characterized in that, This includes a condensate collection system, a multi-stage heat exchange system, an intelligent control system, and a recycling system; The condensate collection system includes a condensate collection pipeline (1), a separator (2), and a primary storage tank (3) for collecting and pre-treating the condensate generated by the external steam supplied to the boiler body (23); The multi-stage heat exchange system includes a plate heat exchanger (4), a shell-and-tube heat exchanger (5), and a waste heat recovery unit (6). The plate heat exchanger (4) and the shell-and-tube heat exchanger (5) are connected in series, and the waste heat recovery unit (6) is connected in parallel between the plate heat exchanger (4) and the shell-and-tube heat exchanger (5) to maximize the recovery of heat energy in the condensate. The intelligent control system includes a temperature sensor (7), a pressure sensor (8), a flow sensor (9), and a PLC controller (10). The temperature sensor (7), pressure sensor (8), and flow sensor (9) are respectively installed in the inlet and outlet of the condensate collection pipeline (1), the plate heat exchanger (4), the shell-and-tube heat exchanger (5), and the waste heat recovery unit (6), as well as in the primary storage tank (3), for real-time monitoring of the operating parameters of each system. The recycling system includes a variable frequency pump (11), a return water pipeline (12), and a secondary storage tank (13) for transporting the treated condensate back to the boiler body (23) water supply system.

2. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The separator (2) is equipped with a deoxygenation device (14) and a filter device (15). The deoxygenation device (14) adopts a vacuum deoxygenation method, and the filter device (15) has a multi-layer filter structure.

3. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The plate heat exchanger (4) uses stainless steel corrugated plates with a thickness of 0.5-0.8 mm and a plate spacing of 2.5-3.5 mm.

4. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The waste heat recovery unit (6) is equipped with a spiral tube bundle, which is made of copper tube with a diameter of 25-32mm.

5. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The PLC controller (10) is connected to a touch screen (16) operating interface, which displays the system operating status, temperature curve and energy consumption data.

6. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The variable frequency pump (11) is a centrifugal pump with a power of 7.5-15kW and a flow rate of 20-50m³ / h.

7. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The return water pipeline (12) is equipped with a check valve (17), a regulating valve (18) and a safety valve (19). The check valve (17) is used to prevent backflow, the regulating valve (18) is used to control the flow rate, and the safety valve (19) is used to protect the system safety.

8. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The secondary storage tank (13) has a volume of 5-20 m³ and is equipped with a level gauge (20) and an overflow device (21).

9. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The condensate collection pipeline (1) is an insulated pipeline with an insulation layer thickness of 50-80mm.

10. The industrial boiler external steam condensate recovery and utilization device according to claim 1, characterized in that: The multi-stage heat exchange system also includes a cooling tower (22) for auxiliary cooling during high summer temperatures.

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