Waste heat recovery treatment system
By designing an alternating steamer system and heat exchange pool, the problem of unusable heat and chemical substances in the waste gas was solved, achieving efficient recovery and utilization of waste heat and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-13
AI Technical Summary
During the papermaking process, the heat and chemicals in the waste gas cannot be used properly, resulting in energy waste.
Design a waste heat recovery system, including at least two steamers and a heat exchange tank. By alternating the operation of the steamers and using a pressure pump and gate valve to control the steam flow, the waste gas can be recovered and reused. At the same time, a one-way valve is set to prevent chemical backflow. The heat exchange tank is used to recover heat from the waste gas through heat exchange.
It significantly improved the waste heat recovery rate, reduced energy consumption, and realized the rational utilization of heat and chemical substances in the waste gas.
Smart Images
Figure CN223992229U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery and treatment system. Background Technology
[0002] The paper industry is closely related to the development of the national economy and social undertakings. It promotes the development of forestry, agriculture, chemical industry, printing, logistics and other industries. However, as a major energy consumer, it consumes a lot of energy in the production process. Therefore, it still has great potential for energy conservation.
[0003] In the papermaking process, boilers are typically used to supply high-temperature and high-pressure steam, which is then used in conjunction with chemical substances to cook the raw materials. Under the conditions of high-temperature and high-pressure cooking, the chemical substances mainly react with lignin, cellulose, and other substances in the raw materials. Most of these substances are consumed and dissolved in the waste liquid, while a small portion remains in the residual gas. At the same time, the residual gas produced after cooking also contains a significant amount of heat. However, due to the residual chemical substances in the residual gas, the heat energy in this portion of the residual gas cannot be utilized effectively. Utility Model Content
[0004] The purpose of this invention is to provide a waste heat recovery system to significantly improve the waste heat recovery rate of the waste gas used in the papermaking process and reduce energy consumption.
[0005] To achieve the above objectives, this utility model provides a waste heat recovery system, including a boiler, at least two steamers, and gas supply pipes corresponding to each steamer. The steamers are connected to the boiler via the gas supply pipes. Adjacent steamers are connected by a first connecting pipe and a second connecting pipe. The first connecting pipe is equipped with a pressure pump. A first gate valve and a second gate valve are respectively installed at both ends of the first connecting pipe. A third gate valve and a fourth gate valve are respectively installed at both ends of the second connecting pipe.
[0006] By utilizing the coordination between the steamers, which operate alternately, and by employing the first, second, third, and fourth gate valves, waste heat can be recovered and utilized. Steam generated by the boiler is delivered to and stored in one steamer via the gas supply pipe for cooking the raw materials. The first, second, third, and fourth gate valves are all in a closed state. After cooking, the first, third, and fourth gate valves are opened, and with the assistance of the pressure pump, the residual gas in the steamer is sent to another steamer to be cooked. After the transfer is completed, all gate valves are closed, and the next batch of cooking can be carried out in the steamer receiving the residual gas. Both the heat and residual chemical substances contained in the residual gas can be recovered and utilized.
[0007] Each of the gas delivery pipes is equipped with a one-way valve, through which the steam inside the boiler flows unidirectionally within the gas delivery pipe.
[0008] The one-way valve is installed in the gas supply pipe so that the steam generated in the boiler can only flow in one direction to the corresponding steam pot. This means that the internal pressure of the steam pot and the internal pressure of the boiler can be dynamically balanced and regulated through the one-way valve. At the same time, the one-way valve can also be used to prevent residual gas mixed with chemical substances from flowing back into the boiler.
[0009] The steamer consists of two steamers, namely a first steamer and a second steamer. The first steamer has a first air inlet, a first return outlet and a first steam inlet. The first air inlet is connected to one end of the first connecting pipe, the first return outlet is connected to one end of the second connecting pipe, and the first steam inlet is connected to the corresponding air supply pipe.
[0010] When there are two steamers, the first steamer performs the steaming process first, and the second steamer serves as a replacement steamer after the first steamer has finished steaming. The first steam inlet sends the steam from inside the boiler to the first steamer for steaming. The first air inlet is used to cooperate with the second steamer so that when the second steamer returns the residual steam, it can be sent to the first steamer through the first air inlet.
[0011] The second steamer has a second air inlet, a second return outlet, a second steam inlet, and an exhaust outlet. The second air inlet is connected to the other end of the first connecting pipe, the second return outlet is connected to the other end of the second connecting pipe, the second steam inlet is connected to the boiler through the corresponding air supply pipe, and the exhaust outlet is connected to an external pipe.
[0012] The second steamer serves as a replacement for the first steamer. After the first steamer has finished steaming, it works with the pressurizing pump to send the residual gas inside the first steamer to the second steamer, reducing unnecessary energy consumption. The second air inlet works with the pressurizing pump to allow the residual gas inside the second steamer to flow back to the first steamer when the first gate valve is closed. The second return port works with the second connecting pipe to achieve residual gas return between the first steamer and the second steamer.
[0013] The waste heat recovery system also includes a heat exchange tank, which is equipped with a circulation pipe. The main body of the circulation pipe is placed in the heat exchange tank, and both ends of the circulation pipe are connected to the steamers.
[0014] The heat exchange tank is also equipped with a hot water pipe, which connects the boiler and the heat exchange tank.
[0015] The heat exchange pool is set up so that the waste gas can directly exchange heat with the water in the heat exchange pool. In conjunction with the hot water pipe, hot water is sent to the boiler, which realizes another way of recovering and utilizing the heat of the waste gas.
[0016] This utility model discloses a waste heat recovery system. Addressing the problem that the waste gas generated in the steamer during the papermaking process contains chemical substances, leading to its inability to be utilized effectively and resulting in energy waste, the system improves upon this design by setting up at least two steamers and using a pressure pump. This allows the steamer in operation to transfer the waste gas to another steamer after it stops working, thus recovering and utilizing the heat energy of the waste gas and reducing the energy consumption of the heating boiler. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of three or more steamer embodiments of a waste heat recovery system according to this utility model.
[0019] Figure 2 This is a schematic diagram of three steamer embodiments of a waste heat recovery system according to this utility model.
[0020] Figure 3 This is a schematic diagram of two steamers in an embodiment of a waste heat recovery system according to this utility model.
[0021] Figure 4 This is a schematic diagram of an embodiment of a waste heat recovery system of the present invention, which includes a heat exchange tank.
[0022] 1. Boiler; 2. Steamer; 3. Gas supply pipe; 4. First connecting pipe; 5. Second connecting pipe; 6. Check valve; 7. First steamer; 8. Second steamer; 9. First air inlet; 10. First return port; 11. First steam inlet; 12. Second air inlet; 13. Second return port; 14. Second steam inlet; 15. Exhaust port; 16. Heat exchanger; 17. Circulation pipe; 18. Hot water pipe; 19. Booster pump; 20. First gate valve; 21. Second gate valve; 22. Third gate valve; 23. Fourth gate valve. Detailed Implementation
[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0024] This utility model provides a waste heat recovery system, including a boiler 1, at least two steamers 2, and gas supply pipes 3 corresponding to each steamer 2. The steamers 2 are connected to the boiler 1 through the gas supply pipes 3. Adjacent steamers 2 are connected by a first connecting pipe 4 and a second connecting pipe 5. The first connecting pipe 4 is equipped with a pressure pump 19. A first gate valve 20 and a second gate valve 21 are respectively provided at both ends of the first connecting pipe 4. A third gate valve 22 and a fourth gate valve 23 are respectively provided at both ends of the second connecting pipe 5.
[0025] In this embodiment, each of the steamers 2 is operated alternately. During the steaming process of the steamer 2, each gate valve is closed. After steaming is completed, the opening and closing of the gate valves are adjusted, and the pressurization pump 19 is activated, so that the residual heat in the steamer 2 can be sent to the adjacent steamer 2, thereby realizing the rational utilization of residual heat.
[0026] The specific implementation method is as follows:
[0027] Please see Figure 2 There are three steamers 2. A boiler 1 is connected to each steamer 2. After heating, the boiler 1 supplies steam to the left steamer 2 for steaming. After 8 hours, steaming is complete. The first gate valve 20, the third gate valve 22, and the fourth gate valve 23 between the left and middle steamers 2 are opened, and the pressure pump 19 is started. This allows residual steam from the left steamer 2 to be sent to the middle steamer 2, reducing energy consumption. The gate valve is then opened, and steaming continues in the middle steamer 2. After 8 hours, the middle steamer 2 has completed steaming. The middle gate valve is then opened... By opening the first gate valve 20, the third gate valve 22, and the fourth gate valve 23 between the steamer 2 and the steamer 2 on the right, and by opening the pressure pump 19 between the middle steamer 2 and the steamer 2 on the right, the residual gas inside the middle steamer 2 can be sent to the steamer 2 on the right. It should be noted that the residual gas inside the middle steamer 2 can also be sent to the steamer 2 on the left. With all gate valves closed, the third gate valve 22, the fourth gate valve 23, and the second gate valve 21 between the middle steamer 2 and the steamer 2 on the left can be opened, and the pressure pump 19 can be started.
[0028] Please see Figure 1When there are three or more steamers 2, the implementation is the same as when there are three steamers 2. After any one of the steamers 2 has steamed, the residual gas can be transported to the steamer 2 adjacent to it, so as to realize the recovery and utilization of residual heat. This will not be elaborated here.
[0029] Furthermore, each of the gas supply pipes 3 is equipped with a one-way valve 6, through which the steam inside the boiler 1 flows unidirectionally within the gas supply pipe 3.
[0030] In this embodiment, the one-way valve 6 is installed in the gas supply pipe 3 to prevent residual gas entering the steam pot 2 from flowing back to the boiler 1 and causing corrosion to the boiler 1. It is also used to balance the internal pressure between the boiler 1 and the operating steam pot 2. That is, when the internal pressure of the boiler 1 is high, steam flows into the steam pot 2 in one direction. When the internal pressure of the steam pot 2 is high, the steam entering the steam pot 2 will not flow back to the boiler 1 until the internal pressure of the boiler 1 is the same as the pressure of the steam pot 2.
[0031] Furthermore, there are two steamers 2, namely a first steamer 7 and a second steamer 8. The first steamer 7 has a first air inlet 9, a first return outlet 10 and a first steam inlet 11. The first air inlet 9 is connected to one end of the first connecting pipe 4, the first return outlet 10 is connected to one end of the second connecting pipe 5, and the first steam inlet 11 is connected to the corresponding air supply pipe 3.
[0032] There are two steamers 2, namely a first steamer 7 and a second steamer 8. The first steamer 7 has a first air inlet 9, a first return outlet 10 and a first steam inlet 11. The first air inlet 9 is connected to one end of the first connecting pipe 4, the first return outlet 10 is connected to one end of the second connecting pipe 5, and the first steam inlet 11 is connected to the corresponding air supply pipe 3.
[0033] In this embodiment, please refer to Figure 3There are two steamers 2. The first steamer 7 is connected to the boiler 1 through the gas supply pipe 3. Steaming is carried out with all gate valves closed. After steaming, the first gate valve 20, the third gate valve 22 and the fourth gate valve 23 are opened, and the pressurization pump 19 is started. Pressurized gas enters the first steamer 7 through the first air inlet 9. The residual gas can enter the second connecting pipe 5 through the first return port 10 and be sent to the second return port 13 of the second steamer 8. Then, all gate valves are closed, and the second steamer 8 is steamed. After the second steamer 8 is steamed, the second gate valve 21, the third gate valve 22 and the fourth gate valve 23 are opened, and the pressurization pump 19 is started. This allows the residual gas in the second gate valve 21 to be sent into the first steamer 7. On the one hand, the residual gas, residual heat and some chemical substances are recovered and utilized. On the other hand, the operation of the boiler 1 does not need to be stopped, reducing the energy consumption of the boiler 1 during the cooling and reheating process.
[0034] Furthermore, the waste heat recovery system also includes a heat exchange tank 16, in which a circulation pipe 17 is provided. The main body of the circulation pipe 17 is placed in the heat exchange tank 16, and both ends of the circulation pipe 17 are connected to each of the steam pots 2.
[0035] The heat exchange tank 16 is also equipped with a hot water pipe 18, which connects the boiler 1 and the heat exchange tank 16.
[0036] Please see Figure 4 In this embodiment, a heat exchange tank 16 is provided, and water is stored in the heat exchange tank 16. The residual gas in the steamer 2 is sent to the heat exchange tank 16 to exchange heat with the water in the heat exchange tank 16. The water after heat exchange is then sent to the boiler 1, which reduces the energy used by the boiler 1 in the process of generating steam, so as to meet the rational utilization of the heat energy of the residual gas. The residual gas after heat exchange can be sent to the steamer 2 through the hot water pipe 18, thereby realizing the rational use of the residual gas and internal chemical substances.
[0037] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.
Claims
1. A waste heat recovery treatment system, characterized in that, it comprises a boiler (1), at least two steam kettles (2), and a gas feeding pipe (3) arranged in one-to-one correspondence with the steam kettles (2), the steam kettles (2) are connected to the boiler (1) through the gas feeding pipes (3), a first connecting pipe (4) and a second connecting pipe (5) are connected between adjacent steam kettles (2), the first connecting pipe (4) is provided with a pressure pump (19), and the first connecting pipe (4) is provided with a first gate valve (20) and a second gate valve (21) at both ends respectively, and the second connecting pipe (5) is provided with a third gate valve (22) and a fourth gate valve (23) at both ends respectively.
2. The waste heat recovery treatment system according to claim 1, characterized in that, a one-way valve (6) is arranged in each of the gas feeding pipes (3), and the steam in the boiler (1) flows in one direction in the gas feeding pipes (3) through the one-way valves (6).
3. The waste heat recovery treatment system according to claim 1, characterized in that, the steam kettles (2) are two, which are a first steam kettle (7) and a second steam kettle (8), the first steam kettle (7) has a first gas inlet (9), a first backflow port (10), and a first steam inlet (11), the first gas inlet (9) is connected to one end of the first connecting pipe (4), the first backflow port (10) is connected to one end of the second connecting pipe (5), and the first steam inlet (11) is connected to the corresponding gas feeding pipe (3).
4. The waste heat recovery treatment system according to claim 3, characterized in that, the second steam kettle (8) has a second gas inlet (12), a second backflow port (13), a second steam inlet (14), and an exhaust port (15), the second gas inlet (12) is connected to the other end of the first connecting pipe (4), the second backflow port (13) is connected to the other end of the second connecting pipe (5), the second steam inlet (14) is connected to the boiler (1) through the corresponding gas feeding pipe (3), and the exhaust port (15) is connected to an external pipe.
5. The waste heat recovery treatment system according to claim 1, characterized in that, the waste heat recovery treatment system further comprises a heat exchange pool (16), a circulating pipe (17) is arranged in the heat exchange pool (16), the main body of the circulating pipe (17) is arranged in the heat exchange pool (16), and both ends of the circulating pipe (17) are connected to the steam kettles (2).
6. The waste heat recovery treatment system according to claim 5, characterized in that, a hot water pipe (18) is further arranged in the heat exchange pool (16), and the hot water pipe (18) is connected to the boiler (1) and the heat exchange pool (16).