Exhaust steam condensate pipe mixing device
By using a series-connected waste heat condensate pump and pipeline combination design, the problem of uneven condensate mixing was solved, the deaeration effect of the deaerator was improved, and the power consumption was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- VEOLIA (HARBIN) THERMAL POWER CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-06-26
AI Technical Summary
When condensate with different parameters is transported to the deaerator through the same condensate header, the medium is not mixed evenly, which affects the operational stability and deaeration effect of the deaerator and increases the corrosion risk of the boiler and turbine unit.
The waste heat condensate pumps, which operate in series, mix condensate at different temperatures at the inlet of the heat exchanger condensate pump through a combination of tapered and expanded diameter changes and elbows. Then, the condensate is mixed at high speed by a centrifugal pump. The parallel operation of the condensate pumps is changed to series operation.
This achieves uniform mixing of condensate, improves the deoxygenation effect of the deaerator, and reduces the operating frequency and power consumption of the waste heat condensate pump.
Smart Images
Figure CN224404975U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a mixing device for waste heat condensate pipeline. Background Technology
[0002] In actual field operations, various heat exchangers are used in energy projects to meet different needs. However, due to the different types and forms of heat exchangers, the condensate water temperature after steam with the same parameters enters different heat exchangers will be different. When two or more condensates with different parameters are transported to the deaerator through a condensate header, the medium will flow in a laminar state inside the pipe. Uneven mixing will lead to inconsistent temperatures of the medium entering the deaerator, resulting in unstable deaerator operation and reduced deaeration capacity. Poor deaeration will cause dissolved oxygen in the boiler feedwater to exceed the standard, which will aggravate oxygen corrosion of metal pipes and increase the risk of boiler tube rupture and severe corrosion of the turbine unit. Summary of the Invention
[0003] The purpose of this invention is to provide a waste heat condensate pipeline mixing device that enhances the mixing capacity of the medium. It changes the operation of the parallel condensate pumps to a series operation, which significantly reduces the operating frequency of the waste heat condensate pumps and lowers their power consumption. More importantly, the centrifugal pump rotation ensures that condensate at different temperatures is uniformly mixed before entering the deaerator, thus significantly improving the deaeration effect.
[0004] The technical solution of this utility model is: a waste heat condensate pipeline mixing device, comprising a steam header (1), a heat exchanger (2), a heat pump (3), a deaerator (4), a condensate header (5), a heat exchanger condensate pump inlet pipe (6), a heat exchanger condensate pump (7), a waste heat condensate pump (8), a condensate tank (9), a heat exchanger condensate pump outlet pipe (10), and a valve (11) on the waste heat condensate pump to the heat exchanger condensate pump outlet pipe. The system consists of a valve (12), a reducing diameter reducer (13), a expanding diameter reducer (14), and an elbow (15) on the inlet pipe of the waste heat condensate pump to the heat exchanger; the steam header (1) is connected to the heat exchanger (2) for heat exchange, and the steam header (1) is connected to the heat pump (3) for heat exchange; the heat exchanger (2) is sequentially connected to the inlet pipe (6) of the heat exchanger condensate pump, the heat exchanger condensate pump (7), the heat exchanger condensate pump outlet pipe (10), and the condensate pump outlet pipe (15). The condensate header (5) and deaerator (4) are connected. The steam cooling condensate in the heat pump (3) enters the condensate tank (9) by gravity. The bottom of the condensate tank (9) is connected to the waste heat condensate pump (8). The waste heat condensate pump (8) is connected to the heat exchanger condensate pump outlet pipe (10) and the heat exchanger condensate pump inlet pipe (6). The heat exchanger condensate pump inlet pipe (6) is connected to the waste heat condensate pump (8) through a pipeline to the heat exchanger condensate pump outlet. The inlet valve (11) is connected to the inlet valve (12) of the heat exchanger condensate pump through the pipeline; the reducing diameter (13) is installed in the middle position between the waste heat condensate pump and the inlet valve (12) of the heat exchanger condensate pump; the expanding diameter (14) is installed in the middle position of the inlet pipe (6) of the heat exchanger condensate pump, and the elbow (15) is installed inside the inlet pipe (6) of the heat exchanger condensate pump and connected to the expanding diameter (14).
[0005] When the condensate inside the condensate tank (9) is transported by the waste heat condensate pump (8) to the heat exchanger condensate pump outlet pipe (10), the heat exchanger condensate pump (7) and the waste heat condensate pump (8) operate in parallel.
[0006] When the condensate inside the condensate tank (9) is transported by the waste heat condensate pump (8) to the inlet pipe (6) of the heat exchanger condensate pump, the heat exchanger condensate pump (7) and the waste heat condensate pump (8) operate in series.
[0007] Install the reducing reducer (13) first, then the expanding reducer (14), and finally the elbow (15) at the position of the inlet pipe (6) from the waste heat condensate pump (8) to the heat exchanger condensate pump inlet pipe (6) in the direction of medium flow.
[0008] Elbow (15) is installed inside the inlet pipe (6) of the condensate pump of the heat exchanger.
[0009] The working principle of this utility model:
[0010] The steam header (1) is connected to the heat exchanger (2) and the heat pump (3) for heat exchange. The steam cooling condensate entering the heat exchanger (2) is transported to the heat exchanger condensate pump (7) through the heat exchanger condensate pump inlet pipe (6). After being pressurized, it is transported to the deaerator (4) through the heat exchanger condensate pump outlet pipe (10) and the condensate header (5). The steam cooling condensate entering the heat pump (3) enters the condensate tank (9) by gravity. The condensate inside the condensate tank (9) is transported to the heat exchanger condensate pump outlet by the waste heat condensate pump (8). The pipe (10) and the heat exchanger condensate pump inlet pipe (6) can be isolated by the waste heat condensate pump to heat exchanger condensate pump outlet pipe valve (11) and the waste heat condensate pump to heat exchanger condensate pump inlet pipe valve (12); the tapered reducer (13) and the expanding reducer (14) are installed in the middle of the waste heat condensate pump to heat exchanger condensate pump inlet pipe valve (12) and the heat exchanger condensate pump inlet pipe (6), and the elbow (15) is installed inside the heat exchanger condensate pump inlet pipe (6) and connected to the expanding reducer (14).
[0011] This utility model changes the method of transporting the steam condensate in the heat pump (3) to the heat exchanger condensate pump outlet pipe (10) via the waste heat condensate pump (8) after it is collected in the condensate tank (9). Instead, the waste heat condensate pump (8) transports the condensate to the heat exchanger condensate pump inlet pipe (6). The operation method is to close the valve (11) of the waste heat condensate pump to the heat exchanger condensate pump outlet pipe and open the valve (12) of the waste heat condensate pump to the heat exchanger condensate pump inlet pipe to transport the condensate in the condensate tank (9) to the heat exchanger condensate pump inlet pipe (6). When the medium passes through the tapered section (13), the flow area decreases and the flow velocity increases. After passing through the expanding section (14), the flow area increases, the capacity is expanded and the pressure is reduced. Then, the medium flow direction is guided by the elbow (15).
[0012] Technical effects of this utility model:
[0013] This invention solves the problem of uneven mixing temperature caused by laminar flow when condensate of different temperatures is transported through the same pipeline. By changing the method from transporting condensate from the waste heat pump (8) to the outlet pipe (10) of the heat exchanger condensate pump to transporting condensate from the waste heat pump (8) to the inlet pipe (6) of the heat exchanger condensate pump, the low-temperature water condensed by the heat pump and the high-temperature water condensed by the heat exchanger are centrifuged at high speed by the heat exchanger condensate pump (7) and then transported to the deaerator (4) through the condensate header pipe (5) for further work. The uniformly mixed condensate entering the deaerator (4) is more conducive to thermal deaeration. Moreover, after changing the waste heat condensate pump (8) from delivering to the heat exchanger condensate pump outlet pipe (10) to delivering to the heat exchanger condensate pump inlet pipe (6), the heat exchanger condensate pump (7) and waste heat condensate pump (8) change from parallel operation to series operation of the two pumps. In this way, the outlet pressure requirement of waste heat condensate pump (8) is reduced and the operating frequency is reduced, thus achieving the purpose of saving electricity. Attached Figure Description
[0014] Figure 1 Diagram of the waste heat condensate pipeline mixing device system
[0015] Figure 2 A partially enlarged schematic diagram of the mixing device for waste heat condensate pipelines. Detailed Implementation
[0016] like Figure 1The waste heat condensate mixing device shown comprises a steam header 1, heat exchanger 2, heat pump 3, deaerator 4, condensate header 5, condensate pump inlet pipe 6, heat exchanger condensate pump 7, waste heat condensate pump 8, condensate tank 9, heat exchanger condensate pump outlet pipe 10, valve 11 from waste heat condensate pump to heat exchanger condensate pump outlet pipe, valve 12 from waste heat condensate pump to heat exchanger condensate pump inlet pipe, reducer 13, expander 14, and elbow 15. The steam header 1 and heat exchanger 2 are connected for heat exchange, and the steam header 1 and heat pump 3 are also connected for heat exchange. The heat exchanger 2 is sequentially connected to the heat exchanger condensate pump inlet pipe 6, heat exchanger condensate pump 7, heat exchanger condensate pump outlet pipe 10, condensate header 5, and deaerator. Unit 4; The steam cooling condensate in heat pump 3 enters condensate tank 9 by gravity. The bottom of condensate tank 9 is connected to waste heat condensate pump 8. Waste heat condensate pump 8 is connected to heat exchanger condensate pump outlet pipe 10 and heat exchanger condensate pump inlet pipe 6. Heat exchanger condensate pump inlet pipe 6 is connected to waste heat condensate pump 8 to heat exchanger condensate pump outlet pipe valve 11 through a pipeline, and then connected to heat exchanger condensate pump inlet pipe valve 12 through a pipeline. Gradient reducer 13 is installed in the middle position between waste heat condensate pump and heat exchanger condensate pump inlet pipe valve 12. Gradient expander 14 is installed in the middle position of heat exchanger condensate pump inlet pipe 6. Elbow 15 is installed inside heat exchanger condensate pump inlet pipe 6 and connected to gradient expander 14.
[0017] like Figure 2 As shown, when the waste heat condensate pump to the heat exchanger condensate pump inlet pipe valve 12 is opened, the condensate in the condensate tank 9 can be transported to the heat exchanger condensate pump inlet pipe 6. When the condensate passes through the tapered section 13, the flow area decreases and the flow velocity increases. After passing through the expanding section 14, the flow area increases, the volume expands and the pressure decreases. Then, after passing through the elbow 15, the medium flow direction is guided towards the inlet direction of the heat exchanger condensate pump 7. The high temperature and low temperature condensate achieve the first contact mixing. After being mixed by the high-speed rotation of the centrifugal pump, the second thorough mixing is achieved.
Claims
1. A waste heat condensate piping mixing device, characterized by: It consists of a steam header (1), heat exchanger (2), heat pump (3), deaerator (4), condensate header (5), heat exchanger condensate pump inlet pipe (6), heat exchanger condensate pump (7), waste heat condensate pump (8), condensate tank (9), heat exchanger condensate pump outlet pipe (10), waste heat condensate pump to heat exchanger condensate pump outlet pipe valve (11), waste heat condensate pump to heat exchanger condensate pump inlet pipe valve (12), reducing diameter reducer (13), expanding diameter reducer (14), and elbow (15); the steam header (1) and heat exchanger (2) are connected for heat exchange, the steam header (1) and heat pump (3) are connected for heat exchange, and the heat exchanger (2) is sequentially connected to the heat exchanger condensate pump inlet pipe (6), heat exchanger condensate pump (7), heat exchanger condensate pump outlet pipe (10), condensate header (5), and deaerator (4). The steam cooling condensate in the heat pump (3) enters the condensate tank (9) by gravity. The bottom of the condensate tank (9) is connected to the waste heat condensate pump (8). The waste heat condensate pump (8) is connected to the heat exchanger condensate pump outlet pipe (10) and the heat exchanger condensate pump inlet pipe (6). The heat exchanger condensate pump inlet pipe (6) is connected to the waste heat condensate pump (8) through a pipeline to the heat exchanger condensate pump outlet pipe valve (11) and then connected to the heat exchanger condensate pump inlet pipe valve (12) through a pipeline. The tapered reducer (13) is installed in the middle position between the waste heat condensate pump and the heat exchanger condensate pump inlet pipe valve (12). The expanding reducer (14) is installed in the middle position of the heat exchanger condensate pump inlet pipe (6). The elbow (15) is installed inside the heat exchanger condensate pump inlet pipe (6) and connected to the expanding reducer (14).
2. The waste heat condensate pipeline mixing device according to claim 1, characterized in that: When the condensate inside the condensate tank (9) is transported by the waste heat condensate pump (8) to the heat exchanger condensate pump outlet pipe (10), the heat exchanger condensate pump (7) and the waste heat condensate pump (8) operate in parallel.
3. The waste heat condensate pipeline mixing device according to claim 1, characterized in that: When the condensate inside the condensate tank (9) is transported by the waste heat condensate pump (8) to the inlet pipe (6) of the heat exchanger condensate pump, the heat exchanger condensate pump (7) and the waste heat condensate pump (8) operate in series.
4. The waste heat condensate pipeline mixing device according to claim 1, characterized in that: Install the reducing reducer (13) first, then the expanding reducer (14), and finally the elbow (15) at the position of the inlet pipe (6) from the waste heat condensate pump (8) to the heat exchanger condensate pump inlet pipe (6) in the direction of medium flow.
5. The waste heat condensate pipeline mixing device according to claim 1, characterized in that: Elbow (15) is installed inside the inlet pipe (6) of the condensate pump of the heat exchanger.