Boiler blow-down water waste heat recycling device
By combining a fixed-discharge expansion vessel, a steam-water heat exchanger, and a water-water heat exchanger, the problem of low waste heat recovery efficiency in boiler wastewater is solved, achieving efficient and economical heat energy reuse, reducing equipment complexity and maintenance costs, and avoiding energy waste and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANNENG CHEM
- Filing Date
- 2025-04-23
- Publication Date
- 2026-05-15
AI Technical Summary
Existing boiler waste heat recovery equipment is inefficient, complex, and has high maintenance costs, resulting in energy waste and thermal pollution of the environment.
The system employs a combination of a fixed-discharge expansion vessel, a steam-water heat exchanger, and a water-water heat exchanger. Steam heat energy is initially transferred to the water and then to the demineralized water. Impurities are filtered out using a filter cartridge, and the pump body is used to circulate water, achieving efficient recovery and reuse of heat energy.
It improves the efficiency of waste heat recovery from sewage discharge, reduces equipment complexity and maintenance costs, realizes efficient and economical reuse of thermal energy, and avoids energy waste and environmental pollution.
Smart Images
Figure CN224246182U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of heat recovery technology, and in particular to a device for reusing waste heat from boiler wastewater. Background Technology
[0002] During the operation of power plant boilers, it is necessary to periodically discharge wastewater containing high heat but low quality in order to ensure boiler water quality. However, this wastewater often carries a large amount of heat energy, and direct discharge not only wastes energy but may also cause thermal pollution to the environment. Currently, existing equipment for recovering waste heat from boiler wastewater is relatively simple, inefficient, and has problems such as complex equipment and high maintenance costs. Therefore, we propose a waste heat recovery device for boiler wastewater to solve the above problems. Utility Model Content
[0003] The purpose of this application is to provide a boiler waste heat recovery device to solve the problems of low boiler waste heat recovery efficiency, complex equipment, and high maintenance costs, and to achieve efficient and economical recovery and reuse of waste heat from boiler wastewater.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A boiler wastewater waste heat recovery device includes a fixed discharge expansion container. A wastewater pretreatment component is installed on one side of the fixed discharge expansion container. A heat exchange cylinder is connected to the top of the fixed discharge expansion container through a steam discharge pipe. A steam-water heat exchange component is installed inside the heat exchange cylinder. A water-water heat exchange component is installed on one side of the heat exchange cylinder. The water-water heat exchange component includes a plate heat exchanger. The cold fluid inlet of the plate heat exchanger is connected to a first connecting pipe, and the input end of the first connecting pipe is connected to the inner bottom wall of the heat exchange cylinder. A pump body is installed on the outer surface of the heat exchange cylinder.
[0006] In a further embodiment, the wastewater pretreatment component includes a filter cylinder, the interior of which is provided with a coarse-mesh filter screen and a fine-mesh filter screen, and the bottom surface of the filter cylinder is connected to a water supply pipe via a fixed discharge expansion container.
[0007] In a further embodiment, the steam-water heat exchange assembly includes an aluminum water storage tank fixedly connected inside the heat exchange cylinder, and the outer surface of the aluminum water storage tank is inlaid with heat exchange plates arranged in a ring.
[0008] In a further embodiment, a temperature sensor is installed on the inner top wall of the aluminum water storage tank.
[0009] In a further embodiment, the water-to-water heat exchange assembly further includes a second connecting pipe connected to the hot fluid inlet of the plate heat exchanger, the input end of the second connecting pipe passing through the heat exchange cylinder and connected to the inner bottom wall of the aluminum water storage cylinder.
[0010] In a further embodiment, the water-to-water heat exchange assembly further includes a third connecting pipe connected to the cold fluid outlet of the plate heat exchanger, the output end of the third connecting pipe being connected to the input end of the pump body, the output end of the pump body being connected to a fourth connecting pipe, and the output end of the fourth connecting pipe penetrating the heat exchange cylinder and being connected to the outer surface of the aluminum water storage cylinder, and the hot fluid outlet of the plate heat exchanger being connected to a fifth connecting pipe.
[0011] In a further embodiment, the bottom surface of the fixed-discharge expansion container is connected to a first drain pipe, the output end of the first drain pipe is connected to a sealed cylinder, the sealed cylinder is tightly fitted outside the third connecting pipe, and the bottom surface of the sealed cylinder is connected to a second drain pipe.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This application, through the combination of a fixed discharge expansion tank, a steam-water heat exchange component, a water-water heat exchange component, and a pump body, utilizes the steam-water heat exchange component to initially transfer the heat energy in the steam to the water, and then uses the water-water heat exchange component to transfer the heat energy to the demineralized water formed by the steam condensation, thereby further improving the efficient recovery of heat energy in the discharged wastewater.
[0014] By combining the first and second drain pipes with the sealed cylinder, the heat energy of the sewage in the fixed discharge expansion container can be transferred to the circulating water, further shortening the heating time of the circulating water. By combining the filter cylinder, coarse filter screen and fine filter screen, impurities in the sewage can be filtered to ensure the cleanliness of the water and prevent pipe blockage during heat recovery. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the boiler wastewater waste heat recovery device.
[0016] Figure 2 This is a three-dimensional structural schematic diagram of the heat exchanger cylinder of a boiler wastewater waste heat recovery device.
[0017] Figure 3 A three-dimensional structural schematic diagram of the aluminum water storage tank of the boiler wastewater waste heat recovery device.
[0018] Figure 4 This is a three-dimensional structural schematic diagram of the filter cartridge of a boiler wastewater waste heat recovery device, shown in a cross-sectional view.
[0019] In the diagram: 1. Fixed discharge expansion container; 2. Wastewater pretreatment assembly; 201. Filter cylinder; 202. Coarse mesh filter screen; 203. Fine mesh filter screen; 204. Water supply pipe; 3. Steam discharge pipe; 4. Heat exchange cylinder; 5. Second connecting pipe; 6. First connecting pipe; 7. Plate heat exchanger; 8. Fifth connecting pipe; 9. Third connecting pipe; 10. Second drain pipe; 11. Sealed cylinder; 12. First drain pipe; 13. Aluminum water storage tank; 14. Heat exchange plate; 15. Temperature sensor; 16. Pump body; 17. Fourth connecting pipe. Detailed Implementation
[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0021] 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.
[0022] Please see Figure 1-4 In this utility model, a waste heat recovery device for boiler wastewater includes a fixed discharge expansion container 1. A wastewater pretreatment component 2 is provided on one side of the fixed discharge expansion container 1. The wastewater pretreatment component 2 includes a filter cylinder 201. The filter cylinder 201 is provided with a coarse mesh filter 202 and a fine mesh filter 203. The bottom surface of the filter cylinder 201 is connected to the fixed discharge expansion container 1 by a water supply pipe 204. Before entering the fixed discharge expansion container 1, the wastewater will pass through the coarse mesh filter 202 and the fine mesh filter 203, which can remove impurities in the wastewater and avoid pipe blockage during subsequent heat exchange.
[0023] The top of the fixed-discharge expansion vessel 1 is connected to a heat exchange cylinder 4 via a steam discharge pipe 3. The heat exchange cylinder 4 is equipped with a steam-water heat exchange assembly, which includes an aluminum water storage cylinder 13 fixedly connected inside the heat exchange cylinder 4. The outer surface of the aluminum water storage cylinder 13 is inlaid with annularly arranged heat exchange plates 14. The steam generated in the fixed-discharge expansion vessel 1 enters the heat exchange cylinder 4 and transfers heat to the circulating water inside the aluminum water storage cylinder 13 through the aluminum water storage cylinder 13 and the heat exchange plates 14. A temperature sensor 15 is installed on the inner top wall of the aluminum water storage cylinder 13, which can monitor the temperature of the circulating water in real time.
[0024] A water-to-water heat exchange assembly is installed on one side of the heat exchange cylinder 4. This assembly includes a plate heat exchanger 7. The cold fluid inlet of the plate heat exchanger 7 is connected to a first connecting pipe 6, and the input end of the first connecting pipe 6 is connected to the inner bottom wall of the heat exchange cylinder 4. The demineralized water condensed after steam heat transfer enters the plate heat exchanger 7 through the first connecting pipe 6. The water-to-water heat exchange assembly also includes a second connecting pipe 5 connected to the hot fluid inlet of the plate heat exchanger 7. The input end of the second connecting pipe 5 penetrates the heat exchange cylinder 4 and is connected to the inner bottom wall of the aluminum water storage tank 13. The heated circulating water enters the plate heat exchanger 7 through the second connecting pipe 5, thereby transferring heat energy to the demineralized water. The outer surface of the plate heat exchanger is equipped with a pump body 16. The water-to-water heat exchange assembly also includes a third connecting pipe 9 connected to the cold fluid outlet of the plate heat exchanger 7. The output end of the third connecting pipe 9 is connected to the input end of the pump body 16. The output end of the pump body 16 is connected to a fourth connecting pipe 17, and the output end of the fourth connecting pipe 17 passes through the heat exchange cylinder 4 and is connected to the outer surface of the aluminum water storage cylinder 13. The operation of the pump body 16 can draw the circulating water after heat transfer, allowing the circulating water to flow back into the aluminum water storage cylinder 13 for heating. The hot fluid outlet of the plate heat exchanger 7 is connected to a fifth connecting pipe 8, which can be used to discharge the heated demineralized water into the deaerator inlet pipe.
[0025] The bottom surface of the fixed discharge expansion container 1 is connected to a first drain pipe 12, and the output end of the first drain pipe 12 is connected to a sealed cylinder 11. The sealed cylinder 11 is sealed and fitted outside the third connecting pipe 9. The bottom surface of the sealed cylinder 11 is connected to a second drain pipe 10. The sewage inside the fixed discharge expansion container 1 can be discharged from the first drain pipe 12 into the sealed cylinder 11. When the circulating water flows from outside the third connecting pipe 9, it will absorb the heat in the sewage again, which can further shorten the heating time of the circulating water. At the same time, the sewage after heat transfer can be discharged from the second drain pipe 10.
[0026] The working principle of this application is as follows: When in use, sewage is injected into the filter cylinder 201. The coarse mesh filter 202 and the fine mesh filter 203 remove impurities from the water. Then the water enters the fixed discharge expansion container 1, and some sewage will flash into steam. The steam will enter the heat exchange cylinder 4 through the steam discharge pipe 3. Under the heat conduction effect of the aluminum water storage cylinder 13 and the heat exchange plate 14, the heat in the steam will be transferred to the circulating water in the aluminum water storage cylinder 13. At the same time, the steam will condense into demineralized water. The heated circulating water will enter the plate heat exchanger 7 through the second connecting pipe 5. The demineralized water will enter the plate heat exchanger 7 through the first connecting pipe 6. In the plate heat exchanger 7, heat energy will be transferred to the demineralized water. The heated demineralized water can enter the deaerator inlet pipe from the fifth connecting pipe 8. At the same time, the pump body 16 is controlled to work, and the cooled circulating water will be re-drawn into the aluminum water storage cylinder 13 for heating. In this cycle, the heat in the sewage can be efficiently utilized.
[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A device for reusing waste heat from boiler wastewater, characterized in that: The system includes a fixed discharge expansion container (1), a sewage pretreatment component (2) is provided on one side of the fixed discharge expansion container (1), a heat exchange cylinder (4) is connected to the top of the fixed discharge expansion container (1) through a steam discharge pipe (3), a steam-water heat exchange component is provided inside the heat exchange cylinder (4), a water-water heat exchange component is provided on the lower side of the heat exchange cylinder (4), the water-water heat exchange component includes a plate heat exchanger (7), the cold fluid inlet of the plate heat exchanger (7) is connected to a first connecting pipe (6), and the input end of the first connecting pipe (6) is connected to the inner bottom wall of the heat exchange cylinder (4), and a pump body (16) is installed on the outer surface of the heat exchange cylinder (4).
2. The boiler wastewater waste heat recovery device according to claim 1, characterized in that: The wastewater pretreatment component (2) includes a filter cylinder (201), inside which a coarse mesh filter (202) and a fine mesh filter (203) are provided, and the bottom surface of the filter cylinder (201) is connected to the fixed discharge expansion container (1) by a water supply pipe (204).
3. The boiler wastewater waste heat recovery device according to claim 1, characterized in that: The steam-water heat exchange assembly includes an aluminum water storage tank (13) fixedly connected inside the heat exchange cylinder (4), and the outer surface of the aluminum water storage tank (13) is inlaid with heat exchange plates (14) arranged in a ring.
4. The boiler wastewater waste heat recovery device according to claim 3, characterized in that: A temperature sensor (15) is installed on the inner top wall of the aluminum water storage tank (13).
5. The boiler wastewater waste heat recovery device according to claim 1, characterized in that: The water-to-water heat exchange assembly also includes a second connecting pipe (5) connected to the hot fluid inlet of the plate heat exchanger (7). The input end of the second connecting pipe (5) passes through the heat exchange cylinder (4) and is connected to the inner bottom wall of the aluminum water storage cylinder (13).
6. The boiler wastewater waste heat recovery device according to claim 1, characterized in that: The water-to-water heat exchange assembly also includes a third connecting pipe (9) connected to the cold fluid outlet of the plate heat exchanger (7). The output end of the third connecting pipe (9) is connected to the input end of the pump body (16). The output end of the pump body (16) is connected to a fourth connecting pipe (17), and the output end of the fourth connecting pipe (17) passes through the heat exchange cylinder (4) and is connected to the outer surface of the aluminum water storage cylinder (13). The hot fluid outlet of the plate heat exchanger (7) is connected to a fifth connecting pipe (8).
7. The boiler wastewater waste heat recovery device according to claim 1, characterized in that: The bottom surface of the fixed discharge expansion container (1) is connected to a first drain pipe (12), the output end of the first drain pipe (12) is connected to a sealed cylinder (11), the sealed cylinder (11) is sealed and fitted outside the third connecting pipe (9), and the bottom surface of the sealed cylinder (11) is connected to a second drain pipe (10).