电厂余热提取利用系统
By designing a waste heat extraction and utilization system for power plants, the system utilizes low-temperature return water and low-temperature waste water to reduce the temperature of condensate, solving the problems of difficult utilization of waste heat steam condensate and water pump cavitation, increasing the proportion of waste heat converted into steam, and achieving efficient utilization of waste heat and energy conservation and emission reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI NINGFANG GRP
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-17
AI Technical Summary
The utilization of waste heat steam condensate from power plants is difficult, resulting in a low proportion of waste heat converted into steam. In addition, water pumps are frequently damaged due to cavitation, which affects heating efficiency.
Design a waste heat extraction and utilization system for power plants, including a waste heat unit, a steam-water heat exchanger, a water-water heat exchanger, a condensate tank, and a deaerator. Through the design of high-temperature and low-temperature flow channels, the system utilizes low-temperature return water and low-temperature waste water to reduce the temperature of the condensate, avoid water pump cavitation, and increase the temperature of the low-temperature return water and waste water to reduce steam consumption.
It effectively reduced the temperature of condensate, avoided pump cavitation, increased the proportion of waste heat converted into steam, reduced energy consumption, and achieved efficient utilization of waste heat and energy conservation and emission reduction.
Smart Images
Figure CN224516757U_ABST
Abstract
Claims
1. A system for extracting and utilizing waste heat from a power plant, characterized by The system includes a waste heat recovery unit, a steam-water heat exchanger, a water-water heat exchanger, a condensate tank, and a deaerator. The waste heat recovery unit is connected to the steam-water heat exchanger via a waste heat steam pipeline. The steam-water heat exchanger has a supply water pipeline and a return water pipeline for connecting to a heating network, and also has a steam condensate drain pipe. The water-water heat exchanger has a high-temperature flow channel and two low-temperature flow channels inside for mutual heat exchange. The high-temperature flow channel is connected to the steam condensate drain pipe and the condensate tank. One end of one of the low-temperature flow channels is connected to the waste heat collection network, and the other end is connected to the waste heat recovery unit. The other low-temperature flow channel is connected in parallel to the return water pipeline. A water pump is connected between the deaerator and the condensate tank, and the water pump is used to pump the condensate from the condensate tank to the deaerator.
2. The power plant waste heat extraction utilization system according to claim 1, characterized by, The condensate tank is embedded underground, and the water-to-water heat exchanger is located directly above the condensate tank. The bottom of the water-to-water heat exchanger is provided with a drain hole that communicates with the condensate tank.
3. The system for extracting and utilizing waste heat of a power plant according to claim 2, wherein The water-to-water heat exchanger includes an insulated box, a first serpentine tube, and a second serpentine tube. The insulated box contains a high-temperature flow channel formed by several partitions. The first and second serpentine tubes are both bent and arranged within the high-temperature flow channel to form a low-temperature flow channel. One end of the first serpentine tube is connected to the waste hot water collection network, and the other end is connected to the waste heat unit through a waste hot water pipeline. Both ends of the second serpentine tube are connected to the return water pipeline.
4. The power plant waste heat extraction and utilization system as described in claim 3, characterized in that, The waste heat unit is connected to a desulfurization heat exchanger for treating waste gas. The desulfurization heat exchanger has a desulfurization condensate drain pipe, which is connected to the steam condensate drain pipe.
5. The system for extracting and utilizing waste heat of a power plant according to claim 4, wherein The top wall of the insulated box is connected to a pressure relief valve.
6. The system for extracting and utilizing waste heat of a power plant according to claim 3, wherein The return water pipeline includes a first return water section and a second return water section. The first return water section and the second return water section are connected to the water circuit of the steam-water heat exchanger through a three-way connector, and both the first return water section and the second return water section are connected to a first one-way valve. One end of the second serpentine pipe is connected to the first return water section, and the other end is connected to the second return water section.
7. The system for extracting and utilizing waste heat of a power plant according to claim 6, wherein A first flow valve is connected between the second serpentine tube and the first return water section, and a first temperature sensor is provided between the condensate tank and the water pump; wherein, when the detection value of the first temperature sensor is higher than a set range, the first flow valve is used to increase the flow rate of the second serpentine tube, and when the detection value of the first temperature sensor is lower than the set range, the first flow valve is used to decrease the flow rate of the second serpentine tube.
8. The system for extracting and utilizing waste heat of a power plant according to any one of claims 1 to 7, characterized in that, The waste heat steam pipeline is connected to a new steam inlet pipeline and a second one-way valve, the second one-way valve being located between the new steam inlet pipeline and the waste heat unit.
9. The system for extracting and utilizing waste heat of a power plant according to claim 8, wherein A second flow valve is connected to the new steam inlet pipe, and a second temperature sensor is connected to the water delivery pipe.