A boiler deaerator waste heat recovery device
By installing a wound tube heat exchanger and a transition water tank in the boiler deaerator, the heat of high-temperature steam is recovered and used to preheat soft water, solving the problem of heat waste in the boiler deaerator and achieving efficient resource utilization and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TONGJITANG CHINESE MEDICINES CO
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-05
AI Technical Summary
In existing technologies, the high-temperature steam emitted by boiler deaerators is not effectively recovered, resulting in heat waste and low resource utilization.
A spiral tube heat exchanger is used to exchange heat between the high-temperature steam from the deaerator and the cold medium, recovering heat and using it to preheat soft water. The condensate is reused, and a transition water tank buffers steam changes to avoid impacting the deaerator.
It enables the recovery and reuse of high-temperature steam, reduces energy consumption and operating costs, improves resource utilization, and reduces greenhouse gas emissions.
Smart Images
Figure CN224327180U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of waste heat recovery equipment for boiler deaerators, and specifically relates to a waste heat recovery device for boiler deaerators. Background Technology
[0002] A pharmaceutical factory's boiler room heats soft water to generate steam to power the workshop. Before entering the boiler, the soft water needs to pass through a deaerator to remove oxygen through heating. Therefore, during operation, steam with a temperature as high as 104 degrees Celsius is generated and directly discharged outdoors, resulting in heat waste. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a waste heat recovery device for boiler deaerators, which can recover and utilize the emitted high-temperature steam, reduce energy consumption, and improve resource utilization.
[0004] The technical solution adopted by this utility model is as follows: a waste heat recovery device for a boiler deaerator, including a heat exchanger, the heat exchanger having a hot medium inlet, a hot medium outlet, a cold medium inlet and a cold medium outlet, the hot medium inlet being connected to the steam outlet of the deaerator through a hot medium steam inlet pipe, the hot medium outlet being connected to a hot water tank through a hot medium condensate pipe, the cold medium inlet being connected to a first water pump through a cold medium inlet pipe, the inlet of the first water pump being connected to the hot water tank through a pump pipe, the cold medium outlet being connected to the deaerator through a cold medium outlet pipe, the hot water tank being connected to the outlet of the boiler economizer through a preheated hot water pipe, the inlet of the boiler economizer being connected to a second water pump through an economizer inlet pipe, and the second water pump being connected to a cold water tank through a pump pipe.
[0005] Furthermore, the heat exchanger mentioned above is a wound tube heat exchanger, which is fixedly connected to a hanger. The top of the hanger is fixedly connected to the roof and close to the exterior wall, and its height is higher than that of the deaerator.
[0006] Furthermore, the cold medium inlet and cold medium outlet are respectively located on the upper left side and lower left side of the heat exchanger, and the hot medium inlet and hot medium outlet are respectively located on the top and bottom of the heat exchanger.
[0007] Furthermore, the aforementioned cold medium outlet is connected to the transition water tank via a cold medium outlet pipe, and the transition water tank is connected to the hot water tank via another cold medium outlet pipe. The transition water tank is installed on the outdoor wall and is positioned higher than the hot water tank.
[0008] Furthermore, the aforementioned transition water tank has a top-opening cavity, and its bottom is fixedly connected to the outdoor wall via a support frame. An outlet is located at the bottom of the transition water tank, connected to one end of another cold medium outlet pipe. The outlet end of the cold medium outlet pipe is located directly above the transition water tank. A herringbone rain shield is installed on the top of the transition water tank. Two symmetrical inlay plates are vertically arranged on both sides inside the herringbone rain shield. These two inlay plates can be embedded into the transition water tank and remain flush with the side walls of the transition water tank. The length of the inlay plates is consistent with the length inside the water tank. A rear baffle is provided on the rear side of the herringbone rain shield. An inverted U-shaped groove is provided at the lower end of the rear baffle, which engages with the top of the rear side wall panel of the transition water tank. The rear baffle also has a sealing through-hole that passes through the cold medium outlet pipe.
[0009] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model achieves heat exchange by adding a heat exchanger, which can utilize the waste heat of the exhaust to preheat the soft water for boiler use, reducing the heat waste of the deaerator. After heat exchange, the temperature of the soft water rises by about 40°C (the soft water in the cold water tank is preheated to 35-40°C after exiting the boiler economizer), thereby reducing energy consumption and lowering operating costs. At the same time, the steam (104°C) of the deaerator passes through the heat exchanger, condenses into condensate, and then enters the hot water tank, realizing the reuse of water resources and the recovery and utilization of the exhaust high-temperature steam, reducing energy consumption and improving resource utilization. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of a waste heat recovery device for a boiler deaerator.
[0011] Figure 2 A schematic diagram of the connection structure at the heat exchanger mounting location;
[0012] Figure 3 This is a front view schematic diagram of the transition water tank. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0014] Example 1: As Figure 1-3As shown, a waste heat recovery device for a boiler deaerator includes a heat exchanger 1. The heat exchanger 1 has a hot medium inlet 101, a hot medium outlet 102, a cold medium inlet 103, and a cold medium outlet 104. The hot medium inlet 101 is connected to the steam outlet of the deaerator 3 via a hot medium steam inlet pipe 2. The hot medium outlet 102 is connected to a hot water tank 5 via a hot medium condensate pipe 4. The cold medium inlet 103 is connected to a first water pump 7 via a cold medium inlet water pipe 6. The inlet of the first water pump 7 is connected to the hot water tank 5 via a pump pipe. The medium outlet 104 is connected to the deaerator 3 through the cold medium outlet pipe 8. The hot water tank 5 is connected to the outlet of the boiler economizer 10 through the preheated hot water pipe 9. The inlet of the boiler economizer 10 is connected to the second water pump 12 through the economizer inlet pipe 11. The second water pump 12 is connected to the cold water tank 13 through the pump pipe. The cold water tank 13 is connected to the outlet of the water softener 14 through the cold water pipe 15. The inlet of the water softener 14 is connected to the tap water pipe. The cold water tank and the hot water tank are installed on the ground. The boiler economizer 10 is installed in the gas boiler.
[0015] Specifically, heat exchanger 1 adopts a spiral wound tube heat exchanger. Heat exchanger 1 is fixedly connected to hanger 16. The top of hanger 16 is fixedly connected to the roof 17 and close to the outdoor wall 18, and its height is higher than that of deaerator 3.
[0016] To facilitate pipe connection, the cold medium inlet 103 and the cold medium outlet 104 are respectively located on the upper left and lower left sides of the heat exchanger 1, while the hot medium inlet 101 and the hot medium outlet 102 are respectively located at the top and bottom of the heat exchanger 1.
[0017] To avoid the impact of excessive instantaneous changes in hot steam on the deaerator, the cold medium outlet 104 is connected to the transition water tank 19 through a section of cold medium outlet water pipe 6. The transition water tank 19 is connected to the hot water tank 5 through another section of cold medium outlet water pipe 6. The transition water tank 19 is installed on the outdoor wall 18 and is positioned higher than the hot water tank 5. The purpose of setting up the transition water tank is twofold: firstly, unconverted steam can be automatically discharged or condensed into the transition water tank through the connection between the hot water tank and the outside environment; secondly, it avoids the impact of excessive instantaneous changes in hot steam on the deaerator, thus acting as a buffer. The water obtained from the cold medium outlet is similar to distilled water and can directly enter the hot water tank.
[0018] Specifically, the transition water tank 19 has a top-opening cavity 20, and its bottom is fixedly connected to the outdoor wall 18 via a support frame 21. The support frame 21 consists of two inverted L-shaped frames made of angle steel. An outlet 22 is located at the bottom of the transition water tank 19, connecting to one end of another cold medium outlet pipe 6. This cold medium outlet pipe 6 passes through the outdoor wall 18 and connects to the hot water tank 5. The outlet end of the horizontally bent cold medium outlet pipe 6 is located directly above the transition water tank 19. A herringbone rain shield 23 is installed on the top of the transition water tank 19. Two symmetrical inlay plates 24 are vertically arranged on both sides inside the herringbone rain shield 23. The two inlay plates 24 can... The inlay plate 24 is embedded in the transition water tank 19 and fits snugly against the two side walls of the transition water tank 19. The length of the inlay plate 24 is the same as the length inside the transition water tank 19. A rear baffle 25 is provided on the rear side of the herringbone rain cover 23. An inverted U-shaped slot 26 is provided at the lower end of the rear baffle 25. The inverted U-shaped slot 26 is snapped into the top of the rear side wall of the transition water tank 19. The rear baffle 25 is also provided with a through hole 26 that seals the cold medium outlet pipe 6. By setting the herringbone cover, it can block the rainwater from the outside. With the inlay plate, it can block the water generated after the steam passes through the herringbone rain cover and condenses into the transition water tank, preventing water from seeping into the bottom of the herringbone slope and dripping onto the ground.
[0019] Recovery principle: First, room temperature soft water is introduced into the boiler economizer for heat exchange, which lowers the flue gas temperature. At the same time, the cold soft water is initially heated to a temperature of 36-40℃. Then, the initially heated soft water is connected to a spiral tube heat exchanger to exchange heat with the steam generated by the deaerator. After heat exchange, the water temperature reaches 60-65℃. The water at 60-65℃ then enters the deaerator for deoxygenation, which can greatly reduce energy consumption, improve deoxygenation efficiency, and reduce costs.
[0020] Specific benefit analysis: After heat exchange, the temperature of the softened water rises by approximately 40°C, and the heat is recovered. This heat recovery is equivalent to saving approximately 53,900 cubic meters of natural gas. The natural gas prices for January-May and June-December of this year differed, being 4.04 yuan / m³ and 3.66 yuan / m³, respectively. 3 It is calculated that this can save more than 188,000 yuan in gas costs.
[0021]
[0022] Steam passes through a heat exchanger and condenses into condensate. From January to December, 586 tons of water resources were recycled, at a unit price of 4.04 yuan / ton, saving approximately 2,600 yuan in water costs.
[0023]
[0024] In summary, this utility model has the following advantages:
[0025] 1) Reduce energy consumption costs: By installing a heat exchanger to achieve heat exchange, the waste heat from the exhaust can be used to preheat the softened water, reducing heat waste in the deaerator, thereby reducing energy consumption and lowering operating costs;
[0026] 2) Resource reuse: The economizer efficiency was not affected, and the flue gas temperature remained within the normal range. Simultaneously, the boiler's waste heat was converted into usable energy, and condensate was recovered, thus achieving the reuse of thermal energy and water resources.
[0027] 3) Reduce greenhouse gas emissions: By improving energy efficiency, natural gas consumption can ultimately be reduced, thereby reducing greenhouse gas emissions and environmental pollution.
[0028] 4) Easy to promote and apply: The boiler deaerator waste heat recovery system has a compact structure, small footprint, and is easy to install, making it easy to modify and upgrade existing boiler systems.
[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A waste heat recovery device for a boiler deaerator, characterized in that, The system includes a heat exchanger with a hot medium inlet, a hot medium outlet, a cold medium inlet, and a cold medium outlet. The hot medium inlet is connected to the steam outlet of the deaerator via a hot medium steam inlet pipe. The hot medium outlet is connected to the hot water tank via a hot medium condensate pipe. The cold medium inlet is connected to the first water pump via a cold medium inlet pipe. The inlet of the first water pump is connected to the hot water tank via a pump pipe. The cold medium outlet is connected to the deaerator via a cold medium outlet pipe. The hot water tank is connected to the outlet of the boiler economizer via a preheated hot water pipe. The inlet of the boiler economizer is connected to the second water pump via an economizer inlet pipe. The second water pump is connected to the cold water tank via a pump pipe.
2. The waste heat recovery device for a boiler deaerator according to claim 1, characterized in that, The heat exchanger is a spiral wound tube heat exchanger, which is fixedly connected to the hanger. The top of the hanger is fixedly connected to the roof and close to the exterior wall, and its height is higher than that of the deaerator.
3. The waste heat recovery device for a boiler deaerator according to claim 2, characterized in that, The cold medium inlet and cold medium outlet are respectively located on the upper left and lower left side of the heat exchanger, while the hot medium inlet and hot medium outlet are respectively located at the top and bottom of the heat exchanger.
4. The waste heat recovery device for a boiler deaerator according to claim 2, characterized in that, The cold medium outlet is connected to the transition water tank via a cold medium outlet pipe. The transition water tank is connected to the hot water tank via another cold medium outlet pipe. The transition water tank is installed on the outdoor wall and is positioned higher than the hot water tank.
5. A waste heat recovery device for a boiler deaerator according to claim 4, characterized in that, The transition water tank has a top-opening cavity and is fixedly connected to the outdoor wall by a support frame at the bottom. The bottom of the transition water tank is equipped with an outlet that connects to one end of another cold medium outlet pipe. The outlet end of the cold medium outlet pipe is located directly above the transition water tank. A herringbone rain cover is installed on the top of the transition water tank. Two symmetrical inlay plates are vertically installed on both sides inside the herringbone rain cover. The two inlay plates can be embedded into the transition water tank and remain in close contact with the side walls of the transition water tank. The length of the inlay plates is the same as the length inside the water tank. A rear baffle is provided on the rear side of the herringbone rain cover. The lower end of the rear baffle is provided with an inverted U-shaped groove that engages with the top of the rear side wall of the transition water tank. The rear baffle is also provided with a through hole for sealing the passage of the cold medium outlet pipe.